Relevant bibliographies by topics / Coal dewatering

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Coal dewatering'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Coal dewatering"

1

Шкоп, Андрей Александрович. "Dewatering coal polydisperse suspensions." Eastern-European Journal of Enterprise Technologies 2, no. 6(74) (April 20, 2015): 44. http://dx.doi.org/10.15587/1729-4061.2015.40557.

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Liu, Bing Tao, Yi Ming Liu, and Li Min Zhao. "Study on Fly Ash for Conditioning of Specific Resistance of Sludge Water." Advanced Materials Research 955-959 (June 2014): 3318–22. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.3318.

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Effect of the dosage of flocculants on sludge dewatering is analyzed through the determination of sludge specific resistance to filtration. Sludge dewatering behaviors conditioned on Polymeric aluminum, PAM, fly ash and composite flocculants have been compared. The results show all the conditioning agent have help to sludge dewatering. Fly ash from electric power plant as conditioning agent can greatly reduce the specific resistance of sludge and the dewatering performance can be improved.The optimal dosage of fine powdered coal is 20g/100mL and coarse powdered coal is 30g/100mL.Powdered coal is mixed with sludge to form filter cake which is blended with coal in certain proportion to make into fuel.
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Sumer, S. M., J. J. Elton, and J. A. Tapics. "Dewatering optimization using a groundwater flow model at the Whitewood open-pit coal mine, Alberta." Canadian Geotechnical Journal 25, no. 4 (November 1, 1988): 684–93. http://dx.doi.org/10.1139/t88-079.

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By 1980, coal production and coal recovery at the Whitewood mine, Alberta, were unacceptably low as a result of poor groundwater and surface water control at the mine. A feasibility study conducted to determine the most cost-effective method to reduce groundwater inflows into the mine pit and reduce pore-water pressures in the mine walls concluded that a vertical well dewatering system, which would be located behind the highwall, was the most suitable. A finite difference computer model was constructed and successfully applied to design the dewatering system. The flexibility and ease of application of the model made it possible to determine the optimum number, production schedules, and locations of the dewatering wells, in conjunction with evolving mine plans. The implementation of the dewatering well program and improvements in surface water and in-pit drainage have resulted in increased coal recovery, a significant decrease in mine wall failures, and improved coal quality. Key words: dewatering, modelling, groundwater, open-pit mining, hydrogeology, pumping wells, optimization, monitoring, coal recovery.
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Burat, Firat, Ayhan A. Sirkeci, and Güven Önal. "Improved Fine Coal Dewatering by Ultrasonic Pretreatment and Dewatering Aids." Mineral Processing and Extractive Metallurgy Review 36, no. 2 (September 25, 2014): 129–35. http://dx.doi.org/10.1080/08827508.2014.898637.

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Tyulenev, Maxim, Sergey Markov, Sergey Kravchenko, and Stefan Vöth. "Study of slurry dewatering in a horizontally placed shell filtering construction." E3S Web of Conferences 303 (2021): 01052. http://dx.doi.org/10.1051/e3sconf/202130301052.

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Dewatering of water-coal slurry or thickened product under conditions of operating SUEK-Kuzbass JSC enrichment plants is a promising direction of obtaining technogenic mineral resources. It should also be noted that the quality of the obtained product will be directly influenced by the quality of the initial raw materials. If the content of carbon particles is high and the average ash content of the solid phase is low, such a slurry will be of interest in terms of obtaining additional volumes of coal after dewatering. The object of this study is water-coal slurry obtained at the outlet of the radial thickener (thickened product). The subject of the research is technology of thickened product dewatering with the use of shell filter constructions. The aim of the work is to develop and substantiate parameters of low-cost technology of thickened product dewatering to ensure an increase in economic and environmental efficiency of mining operations. The idea of the work is to use the laws of mass transfer of suspended particles of water-coal slurry by filtering through specially made shell filter constructions (SFC).
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Lu, Xiuqin, Zhiqi Wu, Xuefei Li, Chen Zhang, Ning Wang, Mulian Huang, Zhengshuai Liu, and Yidong Cai. "Novel method for optimizing the dewatering rate of a coal-bed methane well." Energy Exploration & Exploitation 38, no. 4 (January 5, 2020): 1099–117. http://dx.doi.org/10.1177/0144598719898537.

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The reasonable dewatering rate in the single-phase water flow plays an essential role in pressure propagation and coal-bed methane production. However, current fluid velocity sensitivity experiments cannot provide an optimum dewatering rate for field coal-bed methane production. This study proposes a new method to optimize the dewatering rate for coal-bed methane wells by assuming the investigation distance reaches the well boundary when the bottom hole pressure declines to the critical desorption pressure. The effect of the stress sensitivity and fluid velocity sensitivity on pressure propagation was first simulated with COMSOL Multiphysics software. The results showed that the expansion area considering the stress sensitivity is shorter than that neglecting the stress sensitivity when the bottom hole pressure reached to the critical desorption pressure at 200 days. The expansion area with high dewatering rate will be shorter about 35 m than that with low dewatering rate at 200 days. The relationship between the maximum investigation distance and required time was established to optimize the dewatering rate by combining the pressure profile considering the influence of stress sensitivity with material balance equation. The new model indicates that the initial permeability, porosity, and cleat compressibility have an important effect on investigation distance. The simulation of these parameters’ sensitivity suggests that the bigger the ratio of initial permeability and porosity, the longer the investigation distance is, and the smaller the cleat compressibility is, the longer the expansion area is. According to this model, we need to take more than 600 days at 0.58 m/d constant dewatering rate to reach the maximum investigation distance of 0.67 mD initial permeability. This work can be conducive to choose reasonable dewatering rate in single-phase water flow for coal-bed methane well production.
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Le Roux, M., Q. P. Campbell, and M. J. Van Rensburg. "Fine Coal Dewatering Using High Airflow." International Journal of Coal Preparation and Utilization 34, no. 3-4 (April 16, 2014): 220–27. http://dx.doi.org/10.1080/19392699.2014.869939.

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8

Miura, Kouichi, Kazuhiro Mae, Ryuichi Ashida, Tomoichiro Tamura, and Takayuki Ihara. "Dewatering of coal through solvent extraction." Fuel 81, no. 11-12 (July 2002): 1417–22. http://dx.doi.org/10.1016/s0016-2361(02)00059-5.

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9

., Sonali Samanta. "ELECTRO-OSMOSIS DEWATERING OF COAL SLUDGE." International Journal of Research in Engineering and Technology 05, no. 13 (January 25, 2016): 84–87. http://dx.doi.org/10.15623/ijret.2016.0513015.

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10

Kalashnikov, Valentin, Anton Gorbachev, and Zuzana Šimková. "Experimental Study of the Coal Slurry Dewatering." E3S Web of Conferences 174 (2020): 02022. http://dx.doi.org/10.1051/e3sconf/202017402022.

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Currently, over 50% of Russia’s coal is mined in Kuzbass region. This is the reason for extreme pressure on natural resources and ecology in the region. At present, more than 100 coal mines and open-pit mines, as well as 54 concentrating plants and facilities are operating in Kuzbass. Wastewater and wastes of concentration plants, which used sludge collectors, contain significant amounts of coal slurry in the form of finely dispersed particles. Filtered cake as a potential raw material is of interest from an economic point of view. This technogenic raw material is a waste of mining production in fact. At the same time, the high humidity, and the complexity of loading and transportation, and the lack of compliance with consumer requirements does not allow full using of this raw material. This article presents some results of experimental research on coal sludge dewatering using geosynthetic materials. The received experimental data allow making the preliminary forecast about possibility of use of geotextile- like materials for coal slurry dewatering with its potential further use.
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Dissertations / Theses on the topic "Coal dewatering"

1

Basim, Gul Bahar Jr. "Fine Coal Dewatering." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35680.

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Fine coal constitutes a relatively small portion of a product stream in a coal cleaning plant. However, its processing cost is approximately three times higher than the cost of processing coarse coal. Therefore, many coal companies chose to discard the fines to refuse ponds, causing a loss of profit and creating environmental concerns. This problem can be solved by developing more efficient fine coal dewatering processes, since bulk of the cost associated with processing fine coal is due to dewatering. For this reason, Virginia Tech has developed new chemicals that can increase the efficiency of mechanically dewatering coal fines. To determine the performance of the novel reagents on fine coal dewatering, laboratory vacuum filtration and centrifugation tests were conducted. The utilization of the novel dewatering aids in the dewatering systems decreased the final moisture contents of the filter cakes to sufficiently low values. There was approximately 50% reduction in the cake moisture of many coal samples with the usage of the novel dewatering aids. The tests were performed on various coal samples from different coal preparation plants. This gave the advantage of testing the novel dewatering aids at many different conditions since each sample had its own characteristics. The vacuum filtration tests were extensively used to compare the efficiency of each novel reagent in dewatering. The best performing dewatering aids were determined and they were further utilized to analyze the effects of operational variables, such as; drying cycle time, cake thickness, vacuum pressure level and slurry temperature on dewatering. A statistical analysis was also performed to observe the effect of each factor quantitatively. The analyses were very useful in terms of determining the synergistic effects of these factors in dewatering of fine coal. The centrifuge tests were conducted to examine the efficiency of the novel reagents in a different dewatering application. The experimental results showed a significant improvement in centrifuge dewatering with the usage of proper coal sample. The moisture contents of fairly thick cakes decreased down to 5-10%. This outcome was very satisfactory since most of the dewatering aids commonly used in the coal industry were observed to increase the final cake moisture in centrifuge dewatering instead of decreasing it. Finally, surface chemistry analyses were performed on the coal samples and slurries to analyze the changes in the chemistry of the dewatering system in the presence of the novel dewatering aids. It was observed that there was a favorable improvement in the system chemistry, which was helpful in terms of decreasing the cake moisture content. These observations were also consistent with the results of the dewatering tests. The combined effect of the novel additives in decreasing the surface tension of the slurry and increasing the contact angle of the coal surface at the same time was concluded to be the reason for their significant performance as dewatering aids.
Master of Science
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Keles, Serhat. "Fine Coal Dewatering Using Hyperbaric Centrifugation." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37807.

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The solid-solid separation processes employed by modern coal preparation plants require large amounts of process water that must be removed from the surfaces of particles using mechanical dewatering equipment. Unfortunately, the existing processes that are used to dewater fine particles are inefficient in terms of moisture reduction and/or solids recovery. Many coal preparation plants are forced to discard fine coal particles because of the inability of existing technologies to reduce the moisture content of this product to an acceptable level. In light of this problem, a new ultrafine dewatering process called hyperbaric filter centrifugation (HFC) has been developed. This novel method combines centrifugation and pressure filtration within a single process to substantially reduce moistures over what can be achieved using conventional dewatering systems. In the current study, steady-state and dynamic dewatering models were developed in order to be able to simulate the behavior of the HFC technology. The steady-state model, which was based on grain-size properties, used empirical expressions to predict product moistures. On the other hand, the dynamic model was based on fundamental theories of filtration and centrifugation. Although the dynamic model provided a better understanding of the working principles of the process, the steady-state grain model produced more accurate equilibrium moisture predictions. Therefore, the steady-state model was used to further investigate the effects of several parameters on cake moistures. As such, the steady-state model was useful for scale up and design purposes. The steady-state dewatering model was also used to perform an economical analysis of potential applications of the HFC technology. The model was used to investigate a variety of new circuit designs that have the potential to be commercially applied in the coal industry. The results clearly showed that this new technology would allow coal companies to process difficult-to-dewater ultrafines using the HFC process, while coarser solids would be more appropriately dewatered using conventional technologies such as vacuum filters or screenbowl centrifuges. This â split dewateringâ concept would provide substantially higher profitability due to lower moistures and higher recoveries of ultrafine solids than could be achieved using a single dewatering process. Laboratory- and pilot-scale versions of this technology has been constructed and tested at the facilities of Mining & Minerals Engineering Department of Virginia Tech. Results of this testing program showed that 30-50% lower moisture values than the ones obtained using conventional mechanical dewatering processes could be achieved with the HFC technology. Based on these promising results, a pilot-scale prototype unit, which was tested successfully at several commercial U.S. coal plants, was also constructed by Decanter Machine, Inc. Finally, the process of developing of this novel technology was successfully completed with the sale of the first full-scale commercial unit by Decanter Machine, Inc. to a major U.S. coal producer.
Ph. D.
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Eraydin, Mert Kerem. "Evaluation of Novel Fine Coal Dewatering Aids." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34182.

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The costs of cleaning fine coal are substantially higher than those of cleaning coarse coal. Therefore, many many coal companies in the U.S. choose to discard fine coal (150 micron x 0) by means of 6-inch diameter hydrocyclones. The cyclone overflows are stored in fine coal impoundments, which create environmental concerns and represent loss of valuable national resources. The major component of the high costs of cleaning fine coal is associated with the difficulty in fine coal dewatering. Therefore, the availability of efficient of fine coal dewatering methods will greatly benefit companies. In the present study, three different novel dewatering aids have been tested. These include Reagents W (RW), Reagent U (RU), and Reagent V (RV). These reagents are designed to increase the contact angles of the coal samples to be dewatered, which should help decrease the Laplace pressure of the water trapped in filter cake and, hence, increase dewatering rate. They were tested on i) the fresh coal samples from Consolidation Coal Corporation's Buchanan Preparation Plant, ii) a composite drill core sample from the Smith Branch Impoundment, Pinnacle Mine Mining Company, and iii) a blend of coals from the Smith Branch Impoundment, thickener underflow, and thickener feed. The coal samples were used initially for laboratory-scale tests using a 2.5-inch diameter Buchner vacuum filter. The results showed that the use of the novel dewatering aids can reduce the cake moisture up to 50% over what can be achieved without using any dewatering aid. The use of the dewatering aids also increased the kinetics of dewatering by up to 6 times, as measured by cake formation times. On the basis of the laboratory test results, pilot-scale continuous vacuum filtration tests were conducted using a 2-feet diameter Peterson vacuum disc filter. The cake moistures obtained in the pilot-scale test work were similar to those obtained in the laboratory tests, while the fast dewatering kinetics observed in the laboratory tests was manifested as higher throughput. It was found that high-shear agitation is essential for achieving low cake moistures and high throughput.
Master of Science
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Smith, Kara E. "Cleaning and Dewatering Fine Coal using Hydrophobic Displacement." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33416.

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A new processing technique, known as hydrophobic displacement, was explored as a means of simultaneously removing both mineral matter and surface moisture from coal in a single process. Previous thermodynamic analysis suggests that coal moisture will be spontaneously displaced by any oil with a contact angle greater than ninety degrees in water. Based on these results, six methods of hydrophobic displacement were evaluated: hand shaking, screening, air classification, centrifugation, filtration, and displacement. In the first five methods hydrophobic displacement took place during the cleaning stage. A recyclable non-polar liquid (i.e. pentane) was used to agglomerate coal fines followed by a physical separation step to remove the coal agglomerates from the mineral-laden slurry. Bench-scale tests were performed to identify the conditions required to create stable agglomerates. Only the last method, displacement, did not utilized agglomeration and performed hydrophobic displacement during dewatering, not cleaning. A procedure was also developed for determining moisture content from evaporation curves so that the contents of water and pentane remaining in a sample could be accurately distinguished.

Two primary coal samples were evaluated in the test program, i.e., dry pulverized 80 mesh x 0 clean coal and 100 mesh x 0 flotation feed. These samples were further screened or aged (oxidized) to provide additional test samples. The lowest moisture, 7.5%, was achieved with centrifugation of the pulverized 80 mesh x 0 clean coal sample. Centrifugation provided the most reliable separation method since it consistently produced low moisture, high combustible recoveries, and high ash rejections. Hand shaking produced the next lowest moisture at 16.2%; however, the low moistures were associated with a drop in combustible recovery. There was also a great deal of error in this process due to its arbitrary nature. Factors such as oxidation, size distribution, and contact angle hysteresis influenced the concentrate moistures, regardless of the method utilized.
Master of Science

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Ali, Zulfiqar. "Improved strategies for processing fine coal streams." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/49578.

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In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often recovers less than 65 to 70% of the organic matter in this size range. Fine coal separation processes are also inherently less effective in removing pyrite than that of coarse coal separations. Moreover, while fines may represent 10% or less of the total run-of-mine feed, this size fraction often contains one-third or more of the total moisture in the delivered product. In order to address these issues, several multistage coal processing circuits were set up and experimentally tested to demonstrate the potential improvements in fine coal upgrading that may be realistically achievable using an "optimized" fine coal processing flowsheet. On the basis of results obtained from this research, engineering criteria was also developed that may be used to identify optimum circuit configurations for the processing different fine coal streams.
In the current study, several fine coal cleaning alternatives were evaluated in laboratory, bench-scale and pilot-scale test programs. Fine coal processes compared in the first phase of this work included spirals, water-only cyclones, teeter-bed separators and froth flotation. The performance of each technology was compared based on separation efficiencies derived from combustible rejection versus ash rejection plots. The resulting data was used to identify size ranges most appropriate for the various alternative processes. As a follow-up to this effort, a second phase of pilot-scale and in-plant testing was conducted to identify new types of spiral circuit configurations that improve fine coal separations. The experimental data from this effort indicates that a four-stage spiral with second- and fourth-stage middlings recycle offered the best option for improved separation efficiency, clean coal yield and combustible recovery. The newly developed spiral circuitry was capable of increasing cumulative clean coal yield by 1.9 % at the same clean coal ash as compared to that of achieved using existing conventional compound spiral technology. Moreover, the experimental results also proved that slurry repluping after two turns is not effective in improving separation performance of spiral circuits.
The third phase of work conducted in this study focused on the development of methods for improving the partitioning of pyrite within fine coal circuits. The investigation, which included both laboratory and pilot-scale test programs, indicated that density-based separations are generally effective in reducing sulfur due to the large density difference between pyrite and coal. On the other hand, the data also showed that sulfur rejections obtained in froth flotation are often poor due to the natural floatability of pyrite. Unfortunately, engineering analyses showed that pyrite removal from the flotation feed using density separators would be impractical due to the large volumetric flow of slurry that would need to be treated. On the other hand, further analyses indicated that the preferential partitioning of pyrite to the underflow streams of classifying cyclones and fine wire sieves could be exploited to concentrate pyrite into low-volume secondary streams that could be treated in a cost effective manner to remove pyrite prior to flotation. Therefore, on the basis of results obtained from this experimental study, a combined flotation-spiral circuitry was developed for enhanced ash and sulfur rejections from fine coal circuits.
Finally, the fourth phase of work conducted as part of this investigation focused on evaluating a new mechanical, non-thermal dewatering process called Nano Drying Technology (NDT"). Experimental results obtained from bench-scale testing showed that the NDT" system can effectively dewater fine clean coal products from more than 30% surface moisture to single-digit moisture values. Test data obtained using a pilot-scale NDT" plant further validated this capability using a continuous prototype facility. It was also observed that, unlike existing fine coal dewatering processes, the performance of the NDT" system is not constrained by particle size.

Ph. D.
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6

Ali, Zulfiqar. "Identification of Improved Stratigies for Processing Fine Coal." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77050.

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In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often recovers less than 65 to 70% of the organic matter in this size range. Fine coal separation processes are also inherently less effective in removing pyrite than that of coarse coal separations. Moreover, while fines may represent 10% or less of the total run-of-mine feed, this size fraction often contains one-third or more of the total moisture in the delivered product. In order to address these issues, several multistage coal processing circuits were set up and experimentally tested to demonstrate the potential improvements in fine coal upgrading that may be realistically achievable using an "optimized" fine coal processing flowsheet. On the basis of results obtained from this research, engineering criteria was also developed that may be used to identify optimum circuit configurations for the processing different fine coal streams. In the current study, several fine coal cleaning alternatives were evaluated in laboratory, bench-scale and pilot-scale test programs. Fine coal processes compared in the first phase of this work included spirals, water-only cyclones, teeter-bed separators and froth flotation. The performance of each technology was compared based on separation efficiencies derived from combustible rejection versus ash rejection plots. The resulting data was used to identify size ranges most appropriate for the various alternative processes. As a follow-up to this effort, a second phase of pilot-scale and in-plant testing was conducted to identify new types of spiral circuit configurations that improve fine coal separations. The experimental data from this effort indicates that a four-stage spiral with second- and fourth-stage middlings recycle offered the best option for improved separation efficiency, clean coal yield and combustible recovery. The newly developed spiral circuitry was capable of increasing cumulative clean coal yield by 1.9% at the same clean coal ash as compared to that of achieved using existing conventional compound spiral technology. Moreover, the experimental results also proved that slurry repluping after two turns is not effective in improving separation performance of spiral circuits. The third phase of work conducted in this study focused on the development of methods for improving the partitioning of pyrite within fine coal circuits. The investigation, which included both laboratory and pilot-scale test programs, indicated that density-based separations are generally effective in reducing sulfur due to the large density difference between pyrite and coal. On the other hand, the data also showed that sulfur rejections obtained in froth flotation are often poor due to the natural floatability of pyrite. Unfortunately, engineering analyses showed that pyrite removal from the flotation feed using density separators would be impractical due to the large volumetric flow of slurry that would need to be treated. On the other hand, further analyses indicated that the preferential partitioning of pyrite to the underflow streams of classifying cyclones and fine wire sieves could be exploited to concentrate pyrite into low-volume secondary streams that could be treated in a cost effective manner to remove pyrite prior to flotation. Therefore, on the basis of results obtained from this experimental study, a combined flotation-spiral circuitry was developed for enhanced ash and sulfur rejections from fine coal circuits. Finally, the fourth phase of work conducted as part of this investigation focused on evaluating a new mechanical, non-thermal dewatering process called Nano Drying Technology (NDT™). Experimental results obtained from bench-scale testing showed that the NDT™ system can effectively dewater fine clean coal products from more than 30% surface moisture to single-digit moisture values. Test data obtained using a pilot-scale NDT™ plant further validated this capability using a continuous prototype facility. It was also observed that, unlike existing fine coal dewatering processes, the performance of the NDT™ system is not constrained by particle size.
Ph. D.
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7

Kalra, Aashish. "Dewatering of fine coal slurries by selective heating with microwaves." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4536.

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Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains xi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
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8

Gupta, Nikhil. "Development of a Novel Fine Coal Cleaning and Dewatering Technology." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64262.

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The cleaning and dewatering of ultrafine (minus 44 micron) coal slurries is one of the biggest challenges faced by coal industry. Existing commercial technologies cannot produce sellable products from these ultrafine streams; therefore, the industry is forced to discard this potential energy resource to waste impoundments. This practice also has the potential to create an environmental hazard associated with blackwater pollution. To address these issues, researchers at Virginia Tech have worked over the past decade to develop a novel separation process that simultaneously removes both mineral matter and surface moisture from fine coal particles. The first stage of the process uses immiscible non-polar liquids, such as straight chain hydrocarbons, to selectively agglomerate fine coal particles in an aqueous medium. The agglomerates are then passed second stage of processing where mild agitation is used to disperse and fully engulf hydrophobic coal particles into the non-polar liquid and to simultaneously reject any residual water and associated hydrophillic minerals entrapped in the agglomerates. The non-polar liquid, which has a low heat of evaporation, is then recovered by evaporation/condensation and recycled back through the process. The research work described in this document focused on the engineering development of this innovative process using batch laboratory and continuous bench-scale systems. The resulting data was used to design a proof-of-concept (POC) pilot-scale plant that was constructed and successfully demonstrated using a variety of fine coal feedstocks.
Ph. D.
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9

Freeland, Chad Lee. "Low Temperature Drying of Ultrafine Coal." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76750.

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A new dewatering technology, called low temperature drying, has been developed to remove water from ultrafine (minus 325 mesh) coal particles. The process subjects partially dewatered solids to intense mechanical shearing in the presence of unsaturated air. Theoretical analysis of the thermodynamic properties of water indicates residual surface moisture should spontaneously evaporate under these conditions. This is contingent on the large surface area of these fine particles being adequately exposed to an unsaturated stream of air. To demonstrate this process, three dispersion methods were selected for bench-scale testing; the static breaker, air jet conveyor, and centrifugal fan. Each of these devices was chosen for its ability to fully disperse and pneumatically convey the feed cake. The moisture content of the feed cake, and the temperature and relative humidity of the process air were the key parameters that most significantly affected dryer performance. Of the three methods tested, the centrifugal fan produced the best results. The fan was capable of handling feeds as wet as 21.5% and consistently dried the coal fines below 2% moisture. The cost of the air and heat required to provide good drying performance was modeled to explore the practicality of the drying process. Modeling was accomplished by modifying equations developed for thermal dryers. The modeling results indicate, if good exposure of the fine particle surface area is achieved, dryers operating with either heated or unheated (ambient) air can be used for drying ultrafine coal.
Master of Science
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10

Vathavooran, Arunasalam. "Applying froth imaging techniques to characterise the dewatering behaviour of fine coal." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440997.

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Books on the topic "Coal dewatering"

1

Mines, USDI Bureau of. Improved flocculation method for dewatering coal. S.l: s.n, 1985.

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Parekh, B. K. Dewatering studies of fine clean coal. S.l: s.n, 1992.

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Stewart, Bill M. Thickening fine coal refuse slurry for rapid dewatering and enhanced safety. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1986.

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Moebs, Noel N. Feasibility of water diversion and overburden dewatering. Pgh. [i.e. Pittsburgh], Pa: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Schmidt, R. D. Fracture zone dewatering to control groundwater inflow in underground coal mines. [Avondale, Md.]: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Mines, United States Bureau of. Thickening Fine Coal Refuse Slurry For Rapid Dewatering and Enhanced Safety. S.l: s.n, 1986.

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Directorate, Canada Inland Waters. Effect of coal dewatering and coal use on the water quality of the East Poplar River, Saskatchewan: A literature review. Regina, Saskatchewan: Inland Waters Directorate, 1991.

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Brown, P. E. Development of an open pit coal mine dewatering plan in Cesar Department, Colombia, South America: Part1. S.l: s.n, 1985.

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Arnold, Barbara J., Mark S. Klima, and Peter J. Bethell. Challenges in Fine Coal Processing, Dewatering, and Disposal. Society for Mining, Metallurgy & Exploration, Incorporated, 2012.

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Challenges in Fine Coal Processing, Dewatering, and Disposal. Scitus Academics Llc, 2016.

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Book chapters on the topic "Coal dewatering"

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Show, K. Y., Yuegen Yan, and D. J. Lee. "Advances in Algae Dewatering Technologies." In Drying of Biomass, Biosolids, and Coal, 75–96. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018. | Series: Advancing in drying technology: CRC Press, 2019. http://dx.doi.org/10.1201/9781351000871-4.

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Polulyakh, A. D., I. V. Eremeev, and S. B. Chaplygin. "ENHANCEMENT OF HIGH-FREQUENCY SCREENS PERFORMANCE AT COAL SLURRY DEWATERING." In XVIII International Coal Preparation Congress, 753–58. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_116.

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Kamei, Takao, Fuminobu Ono, Keiichi Komai, Takeshi Wakabayashi, and Hayami Itoh. "Dewatering and Utilization of High Moisture Brown Coal." In Drying ’85, 403–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-21830-3_54.

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Flaningam, O. L., M. J. Owen, D. J. Romenesko, and A. Zombeck. "The Role of Silicone Surfactants in Coal Dewatering." In Surfactants in Solution, 1731–45. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-1833-0_47.

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Pavlovic, Vladimir, Dušan Polomčić, and Tomislav Šubaranovič. "Design of the Opencast Coal Mine Drmno Dewatering System." In Lecture Notes in Production Engineering, 101–16. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12301-1_11.

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Novak, Vadim. "The analysis of process flowsheets and selection of equipment for coal fines dewatering." In XVIII International Coal Preparation Congress, 689–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_106.

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Kirillov, Kirill M., Elena N. Chernyshova, and Vadim A. Kozlov. "Innovative Drying Technology “Chronos”. Deep Non-Thermal Dewatering of Coal And Mineral Fines." In XVIII International Coal Preparation Congress, 695–700. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_107.

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Frolov, V. S., L. N. Merkusheva, D. V. Frolov, and A. V. Sidorov. "The Usage of flocculants for the Processes of Thickening and Dewatering of thin coal sludges." In XVIII International Coal Preparation Congress, 713–18. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_110.

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"coal dewatering." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 240. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_32607.

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"Dewatering." In Coal Processing and Utilization, 343–56. CRC Press, 2016. http://dx.doi.org/10.1201/b21459-38.

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Conference papers on the topic "Coal dewatering"

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Niederhauser, Mark, and K. Wilson. "Innovative coal refuse dewatering system." In 14th International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2011. http://dx.doi.org/10.36487/acg_rep/1104_04_niederhauser.

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Bai, Tianhang, Zhongwei Chen, Saiied M. Aminossadati, and Thomas Rufford. "Experimental Study of Impact of Dewatering Induced Coal Fines on Coal Permeability." In Sixth Biot Conference on Poromechanics. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480779.141.

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Khan, Chawarwan, Dan Kuznetsov, Thomas Rufford, Victor Rudolph, and Zhongwei Chen. "Optimisation of Dewatering Rates to Maximise Coal Seam Gas Production." In SPE/AAPG/SEG Asia Pacific Unconventional Resources Technology Conference. Tulsa, OK, USA: Unconventional Resources Technology Conference, 2019. http://dx.doi.org/10.15530/ap-urtec-2019-198210.

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Chen, Wei, Yunlei Wang, Kalyan Annamalai, Jiafeng Sun, and Zhimin Xie. "Dewatering Studies on the Low Rank China Lignite Using N2, CO2 and Air." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44035.

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The integrated gasification and combined cycle (IGCC), uses low rank coal (higher moisture and volatile contents and lower heating value) as fuel for gasification (e.g Texaco gasifier of Tampa electric with low ash coal) and convert the solid fuel into synthetic gas mainly consisting of CO and H2. During the storage of fresh low rank but highly reactive coals near the IGCC plants, the coals undergo drying and low temperature atmospheric oxidation which raises the temperature, reduces the moisture and eventually causes spontaneous ignition if the temperature rises above about 800 °C in the coal piles for bituminous and 500 °C for lignite coals. Thus it is of interest to understand the dewatering mechanism of the low rank lignite by drying samples using N2, CO2 and air (which represents partial oxidation) as drying mediums. Fundamental experiments were performed on dewatering of coal samples using thermo-gravimetric analysis (TGA) with different particle sizes and drying mediums. A wide range of drying temperatures from 100 to 225 °C with a step of 25 °C was investigated at a residence time of about 30 minutes. There are no significant differences among moisture weight loss curves for the three drying mediums. It was found that the lignite lost only 5% mass at about 100 °C. With further increase in temperatures most of the mass loss occurred within the temperature range of 120 to 170 °C. The maximum moisture release rate occurred for the temperatures between 125 °C and 140 °C and hence serves as the optimal temperature range for removing the moisture. When drying temperature was below 140 °C, highest moisture release rate occurred in N2 environment while for CO2 environment, optimal temperature rose beyond 140 °C. The structure of the dewatered lignite samples were further investigated through Scanning Electron Microscopy (SEM) studies. When experiments were repeated in air, ignition occurred and corresponding ignition temperatures were obtained. The larger particles reveal lower ignition temperatures.
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Cardwell, Joshua P. "What Comes Easy Won't Last: Improved Dewatering Efficiency of Undersaturated Coal Reservoirs." In SPE/AAPG/SEG Asia Pacific Unconventional Resources Technology Conference. Tulsa, OK, USA: Unconventional Resources Technology Conference, 2019. http://dx.doi.org/10.15530/ap-urtec-2019-198226.

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Wannapeera, Janewit, Li Xian, Nakorn Worasuwannarak, Ryuichi Ashida, and Kouichi Miura. "Dewatering and Upgrading of Low-rank Coal and Biomass by Utilizing Degradative Solvent Extraction." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_471.

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Denton, Mark S., and William D. Bostick. "New Innovative Electrocoagulation (EC) Treatment Technology for BWR Colloidal Iron Utilizing the Seeding and Filtration Electronically (SAFE™) System." In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7186.

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The presence of iron (iron oxide from carbon steel piping) buildup in Boiling Water Reactor (BWR) circuits and wastewaters is decades old. In, perhaps the last decade, the advent of precoatless filters for condensate blow down has compounded this problem due to the lack of a solid substrate (e.g., powdex resin pre-coat) to help drop the iron out of solution. The presence and buildup of this iron in condensate phase separators (CPS) further confounds the problem when the tank is decanted back to the plant. Iron carryover here is unavoidable without further treatment steps. The form of iron in these tanks, which partially settles and is pumped to a de-waterable high integrity container (HIC), is particularly difficult and time consuming to dewater (low shear strength, high water content). The addition upstream from the condensate phase separator (CPS) of chemicals, such as polymers, to carry out the iron, only produces an iron form even more difficult to filter and dewater (even less shear strength, higher water content, and a gel/slime consistency). Typical, untreated colloidal material contains both sub-micron particles up to, let’s say 100 micron. It is believed that the sub-micron particles penetrate filters, or sheet filters, thus plugging the pores for what should have been the successful filtration of the larger micron particles. Like BWR iron wastewaters, fuel pools/storage basins (especially in the decon. phase) often contain colloids which make clarity and the resulting visibility nearly impossible. Likewise, miscellaneous, often high conductivity, wastesteams at various plants contain such colloids, iron, salts (sometimes seawater intrusion and referred to as Salt Water Collection Tanks), dirt/clay, surfactants, waxes, chelants, etc. Such wastestreams are not ideally suited for standard dead-end (cartridges) or cross-flow filtration (UF/RO) followed even by demineralizers. Filter and bed plugging are almost assured. The key to solving these dilemmas is 1) to break the colloid (i.e., break the outer radius repulsive charges of the similar charged colloidal particles), 2) allow these particles to now flocculate (floc), and 3) form a type of floc that is more readily filterable, and, thus, dewaterable. This task has been carried out with the innovative application of electronically seeding the feed stream with the metal of choice, and without the addition of chemicals common to ferri-floccing, or polymer addition. This patent-pending new system and technique is called Seeding And Filtration Electronically, or the SAFE™ System. Once the colloid has been broken and flocking has begun, removal of the resultant floc can be carried out by standard, backwashable (or, in simple cases, dead-end) filters; or simply in dewaterable HICs or liners. Such applications include low level radwaste (LLW) from both PWRs and BWRs, fuel pools, storage basins, salt water collection tanks, etc. For the removal of magnetic materials, such as some BWR irons, an ElectroMagnetic Filter (EMF) was developed to couple with the ElectroCoagulation (EC), (or metal-Floccing) Unit. In the advent that the wastestream primarily contains magnetic materials (e.g., boiler condensates and magnetite, and hemagnetite from BWRs), the material was simply filtered using the EMF. Bench-, pilot- and full-scale systems have been assembled and applied on actual plant waste samples quite successfully. The effects of initial feed pH and conductivity, as well as flocculation retention times was examined prior to applying the production equipment into the field. Since the initial studies (Denton, et al, EPRI, 2006), the ultimate success of field applications is now being demonstrated as the next development phase. For such portable field demonstrations and demand systems, a fully self enclosed (secondary containment) EC system was first developed and assembled in a modified B 25 Box (Floc-In-A-Box) and is being deployed to a number of NPP sites. Finally, a full-scale SAFE™ System has been deployed to Exelon’s Dresden NPP as a vault cleanup demand system. This is a 30 gpm EC system to convert vault solids/sludges to a form capable of being collected and dewatered in a High Integrity Container (HIC). This initial vault work will be on-going for approximately three months, before being moved to additional vaults. During the past year, additional refinements to the patent pending SAFE™ System have included the SAFER™ System (Scalant and Foulant Electronic Removal) for the removal by EC of silica, calcium and magnesium. This has proven to be an effective enabler for RO, NF and UF as a pretreatment system. Advantages here include smaller, more efficiently designed systems and allowed lower removal efficiencies with the removal of the limiting factor of scalants. Similarly, the SAFE™ System has been applied in the form of a BAC-UP™ System (Boric Acid Clean-Up) as an alternative to more complex RO or boric acid recycle systems. Lastly, samples were received from two different DOE sites for the removal of totally soluable, TDS, species (e.g., cesium, Cs, Sr, Tc, etc.). For these applications, an ion-specific seed (an element of the SMART™ System) was coupled with the Cs prior to EC and subsequent filtration and dewatering, for the effective removal of the cesium complex and the segregation of low level and high waste (LLW & HLW) streams.
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Reports on the topic "Coal dewatering"

1

Parekh, B. K. Dewatering studies of fine clean coal. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6013331.

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Parekh, B. K. Dewatering studies of fine clean coal. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5987026.

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Wu Zhang, David Yang, Amar Amarnath, Iftikhar Huq, Scott O'Brien, and Jim Williams. Development of an Ultra-fine Coal Dewatering Technology and an Integrated Flotation-Dewatering System for Coal Preparation Plants. Office of Scientific and Technical Information (OSTI), December 2006. http://dx.doi.org/10.2172/946468.

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Parekh, B. K., R. Hogg, and A. Fonseca. Evaluation of hyperbaric filtration for fine coal dewatering. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6704445.

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Wilson, J. W., and R. Q. Honaker. Ultrafine coal single stage dewatering and briquetting process. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/205928.

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B. K. Parekh and D. P. Patil. Development of an Advanced Fine Coal Suspension Dewatering Process. Office of Scientific and Technical Information (OSTI), April 2008. http://dx.doi.org/10.2172/970043.

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Roe-Hoam Yoon, Ramazan Asmatulu, Ismail Yildirim, William Jansen, Jinmig Zhang, Brad Atkinson, and Jeff Havens. DEVELOPMENT OF DEWATERING AIDS FOR MINERALS AND COAL FINES. Office of Scientific and Technical Information (OSTI), July 2004. http://dx.doi.org/10.2172/835593.

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Chiang, Shiao-Hung, G. E. Klinzing, B. I. Morsi, J. W. Tierney, M. Badgujar, T. Binkley, Yisun Cheng, Suxuan Huang, I. Qamar, and R. Venkatadri. Dewatering of ultrafine coal: Final report, August 1984-December 1986. Office of Scientific and Technical Information (OSTI), December 1986. http://dx.doi.org/10.2172/5911858.

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Parekh, B. K., R. Hogg, and A. Fonseca. Evaluation of hyperbaric filtration for fine coal dewatering. Final report. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/629356.

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Suuberg, E. M. A new model of coal-water interaction and relevance for dewatering. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/7205460.

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