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Literatura académica sobre el tema "Fine tailings"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 18 de febrero de 2022

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Artículos de revistas sobre el tema "Fine tailings"

Jiang, Qing Hua y Chen Xiang Yu. "The Application of Vapour Equlibrium Technique in Water Retention Study of Fine Grained Tailings". Advanced Materials Research 838-841 (noviembre de 2013): 1785–90. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1785.

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As a problematic material, fine grained tailings have many particular engineering characteristics and seriously affect the safety and stability of the tailing dam body. These engineering properties are closely related to moisture migration and soil suction under different water content. This article chose fine grained tailings of Li Tie Lan Ting tailings dam in Zhejiang province as an example, and measured the soil water characteristic curve (SWCC) of fine grained tailings with different partical size composition and dry density using vapour equilibrium technique. Efforts have also been made to demonstrate the influences of soil type, dry density on water retention. The study result shows that particle-size composition has a significant impact on SWCCs of the tailings. Finer grained samples have lower water loss rate and higher water-holding capacity than coarse grained samples in the same suction state. Contrary with low suction stage, dry density has negligible influence on the soil suction, and parameters effect SWCCs at high suction stage. The research results may provide a theoretical support and a beneficial reference for further research of fine grained tailingss engineering properties.

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Gao, Shan, Xiaowei Cui y Sumei Zhang. "Utilization of Molybdenum Tailings in Concrete Manufacturing: A Review". Applied Sciences 10, n.º 1 (23 de diciembre de 2019): 138. http://dx.doi.org/10.3390/app10010138.

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Dealing with mineral tailings is one of the most important topics for solving the environmental problems in the mining industry. Among the techniques converting stacked molybdenum tailings to reusable cleaner products, one of the most effective ones is to use molybdenum tailings in concrete productions. The physical properties including density, microscopic structure and finesse module, and chemical composition of molybdenum tailings are similar with those of natural sand. The radionuclide assessment of molybdenum tailing meets the requirements for using as structural materials. Therefore, Molybdenum tailing is suitable to be used as the replacement of cement and fine aggregates in mortar and concrete. Based on the results of strength and duration performance comparison, the usage of molybdenum tailing as a replacement of natural sand is a more feasible way than that of ground super-fine molybdenum tailings in cement binder. It is feasible to use molybdenum tailings as fine aggregate in the preparation of structural concrete. When the amount of ground super-fine molybdenum tailings replacing cement is less than 10%, it is beneficial to improve the freeze-thaw and carbonization resistance of the concrete.

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Dong, Tao, Ping Cao, Rong Gui, Qibin Lin y Zhizhen Liu. "Experimental Study on Permeability Coefficient in Layered Fine Tailings under Seepage Condition". Geofluids 2021 (15 de abril de 2021): 1–14. http://dx.doi.org/10.1155/2021/8850138.

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Nearly half of the tailings dams in China are in a state of high-security risks and overservice, and the safety of these tailings dams has always been a concern for relevant scholars. The seepage characteristics of tailings are one of the essential factors affecting the safety of tailings dam. Now, due to the improvement of mineral processing technology, there are many fine tailings dam; the study of the seepage characteristics of the tailings dam is no longer applicable. Fine-grained tailings form uneven deposition in these tailings dams, resulting in the permeability of tailings not conforming to the previous law. Therefore, it is of great significance to study the permeability of fine-grained tailings with uneven deposition. In this paper, the physical model of the simulated tailings dam is established to study the influence of the dry beach slope on the distribution and deposition law of fine tailings during discharge. The test results show that the average particle size of tailings decreases along the length of dry beach, showing the phenomenon of coarsening upstream and thinning downstream. Then, based on the data of fine tailings deposition, the variation characteristics of the permeability coefficient of layered tailings under stable and unstable seepage conditions are studied. The test results show that the variation process of tailings permeability coefficient can be divided into four stages: rapid compaction stage, slow compaction stage, failure stage, and stable stage. Under stable and unstable seepage conditions, the permeability coefficients of unstratified tailing sand are about 10% and 15% higher, respectively, than those in the initial state. The permeability coefficient of layered tailings formed by uneven settlement changes more obviously, which is about 12% and 20% higher than the initial state.

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Amalia, Amalia y Muhtarom Riyadi. "Kualitas Beton SCC dengan Substitusi Agregat Halus Tailing Tambang Emas Daerah Pongkor". MEDIA KOMUNIKASI TEKNIK SIPIL 25, n.º 1 (10 de agosto de 2019): 59. http://dx.doi.org/10.14710/mkts.v25i1.18500.

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This paper presents the results of self compacting concrete (SCC) with water cement ratio 0.30 with four variations of tailings, ie 0%, 5%, 10% and 15%. Superplastisizer used is a type Naptha 511P of PT.Karya Naptha Belide. The results showed that (1) The use of tailings as fine aggregate in concrete SCC, has good workability. The fresh concrete that uses tailings, passing ability and filling ability is decrease. The use of tailings up to 15% of eligible properties filling ability and passing ability of SCC, (2) The more tailings used in SCC, setting time of concrete becomes longer, (3) Concrete with tailings as fine aggregate have unit weight is smaller than the concrete with fine aggregate sand, (4) Concrete with tailings has higher compressive strength and modulus of elasticity than concrete without tailings, (5)The use of tailings in concrete can lower tensile strength of concrete, (6)The optimum replacement of tailing found to be 10% in the concrete.

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Wang, Haijun, Xiaogang Sun, Jianwen Wang, Yun Duan, Changsuo Zhang, Jingping Qiu y Zhenbang Guo. "Effect of Tailings Fine Content on the Properties of Cemented Paste Backfill from the Perspective Packing Density". Advances in Civil Engineering 2021 (1 de junio de 2021): 1–10. http://dx.doi.org/10.1155/2021/9947620.

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In order to quantitatively study the influence of tailings fine content on the properties of cemented paste backfill (CPB) and further understand the mechanism of tailings fine content acting, the concept of packing density was introduced in this study. The packing density of each tailings sample was measured by the wet packing method after the samples with various fine contents were prepared. Moreover, CPBs with different tailings fine contents were tested by the mini slump test, rheological test, uniaxial compressive strength (UCS) test, and mercury intrusion porosimetry test. The results demonstrated that the flow spread and UCS both increase first and then decrease with the increase of tailings fine content, while the yield stress shows an opposite trend. The fine content of tailings affects the flowability of fresh CPB mainly through the packing density. When the fine content is high, the influence of the specific surface area of tailings cannot be ignored. The packing density is an important factor affecting the strength of CPB, and there is an obvious linear relationship between the packing density and UCS. The pore structure of CPB samples with different tailing fine contents is significantly different, and the macroscopic packing density changes the strength of CPB by affecting the microscopic pores.

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Suthaker, Nagula N. y J. Don Scott. "Measurement of hydraulic conductivity in oil sand tailings slurries". Canadian Geotechnical Journal 33, n.º 4 (20 de agosto de 1996): 642–53. http://dx.doi.org/10.1139/t96-089-310.

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Fine tails, the resulting fine waste from oil sand processing, undergoes large-strain consolidation in tailings ponds. Its consolidation behaviour must be analyzed using a large-strain consolidation theory, which requires the determination of the relationship between the void ratio and hydraulic conductivity. Conventional measurement techniques are not suitable for fine tails, and a special slurry consolidometer, with a clamping device to prevent seepage-induced consolidation, was designed to determine the hydraulic conductivity of the fine tails and nonsegregating fine tails sand slurries. The hydraulic conductivity of slurries is not constant but decreases with time to a steady-state value. Hydraulic conductivity is also influenced by the hydraulic gradient and bitumen content. It is shown that a low hydraulic gradient, less than 0.2, is necessary to counteract the effect of the bitumen and to represent tailings pond conditions. The hydraulic conductivity of fine tails sand mixes is controlled by the fines void ratio, hence, fines content. The hydraulic conductivity of chemically amended nonsegregating tailings can be lower than that of fine tails. However, acidlime or acid fly ash amended nonsegregating tailings have similar hydraulic conductivity values in terms of fines void ratio. The hydraulic conductivity of nonsegregating tailings appears to be governed by fines content and by the nature of the fines aggregation caused by the chemical additive. Key words: tailings, slurries, hydraulic conductivity, slurry consolidometer, nonsegregating tailings, oil sands.

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Cui, Liyun, Liang Wang, Ying Xu, Xing Lou y Hao Wang. "Feasibility Evaluation of Replacing River Sand with Copper Tailings". Sustainability 13, n.º 14 (7 de julio de 2021): 7575. http://dx.doi.org/10.3390/su13147575.

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This study aims to realize the resource regeneration application of copper tailing (as fine aggregates for partial replacement of natural fine aggregates), which avoid environmental pollution due to many landfills of copper tailings. The compressive strength and durability (dry shrinkage and sulfate attack) tests were carried out to evaluate the effect of copper tailings replacement on the performance of mortar. The results show that the mortar with copper tailings has higher compressive strength than the one with natural sand. More than 14% improvement in compressive strength can be achieved by adding copper tailings with no more than 40% replacement level. The dry shrinkage of mortar was increased with the copper tailings due to the increase of micro pores in mortar by using copper tailings. Compared with the mortar with natural sand, the dry shrinkage can be reduced by adding copper tailings with no more than 20% replacement level. The sulfate attack resistance is improved by using copper tailings, when the replacement rate is more than 20%. In fact, the micro-aggregate filler effect of copper tailings effectively refines the pore structure and forms more stable, uniform and fine interface micro pores, which is of vital significance for mortar to resist external forces and sulfate ion erosion. However, copper tailings, as a porous material, have water release characteristics in cement mortar. This characteristic is not conducive to the filler effect, which decreases the filling rate in later hydration, leading to higher porosity of copper tailings mortar. More importantly, mortar can solidify heavy metals in copper tailings, which prevents loss of heavy metal such as Cu, Zn, Sr, Zr, As, Ga due to environmental problems.

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Xie, Hai Yun, Li Kun Gao, Shu Ming He, Dian Wen Liu y Xiong Tong. "Flocculation and Sedimentation of Bauxite Flotation Tailings". Applied Mechanics and Materials 260-261 (diciembre de 2012): 1179–82. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.1179.

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Flocculation and sedimentation of fine bauxite from flotation tailing pulp were studied using different flocculants to investigate the possibility of its application. The results of this investigation indicate that inorganic flocculants of PAC and PAS have better flocculating effect than organic flocculants of PAM1# and PAM2# when keeping the original pH (7.5~8.0) of tailing pulp, however its consumption are large. It was found that the pH of pulp is important to the tailings settlement. The dosage of flocculants are greatly reduced and the velocity of floc settling is accelerated when the pH of tailing pulp is adjusted to 6.5~7.0 using sulfuric acid. PAM1# and PAM2# are effective flocculants for fine bauxite from the tailings pulp and improved the sedimentation performance compared with PAC and PAS at pH 6.5~7.0. It was also found that the flocculants can be used in combination to treat original bauxite tailing, and good sedimentation effect has been achieved, but the dosage of reagents is bigger when the organic flocculant is combined with inorganic flocculant.

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Shi, Yueqi, Changhong Li y Dayu Long. "Study of the Microstructure Characteristics of Three Different Fine-grained Tailings Sand Samples during Penetration". Materials 13, n.º 7 (30 de marzo de 2020): 1585. http://dx.doi.org/10.3390/ma13071585.

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This paper explores the microstructural evolution characteristics of tailings sand samples of different types of infiltration failure during the infiltration failure process. The homemade small infiltration deformation instrument is used to test the infiltration failure characteristics of the tailings sand during the infiltration failure process. Evolutionary characteristics of the internal microstructure pores and particle distribution were also studied. Using CT (computerized tomography) technology to establish digital image information, the distribution of the microscopic characteristics of the particle distribution and pore structure after tailing sand infiltration were studied. Microscopic analysis was also performed to analyze the microscopic process of infiltration and destruction, as well as to see the microscopic structural characteristics of the infiltration and destruction of the total tailings. The test results show that there are obvious differences in the microstructure characterization of fluid soil and piping-type infiltration failures. Microstructure parameters have a certain functional relationship with macrofactors. Combining the relationship between macrophysical and mechanical parameters and microstructural parameters, new ideas for future research and the prevention of tailings sand infiltration and failure mechanisms is provided.

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Mao, Song y Qin Zhang. "Mineralogical Characteristics of Phosphate Tailings for Comprehensive Utilization". Advances in Civil Engineering 2021 (31 de marzo de 2021): 1–13. http://dx.doi.org/10.1155/2021/5529021.

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The mineralogical characteristics of a phosphate tailing were studied, and the occurrence state, mineral types, and embedded characteristics of phosphorus in the phosphate tailings were ascertained. The results show that the main minerals in the phosphate tailings are collophane. The main gangue minerals are quartz, dolomite, calcite, a small amount of potassium feldspar, plagioclase, chlorite, etc. Monazite was found in phosphate tailings. In addition, the coarse grain size of quartz and feldspar and fine embedded particle size of calcite and dolomite are also the main factors affecting the mineral processing of phosphate tailings. According to the analysis of mineralogical characteristics, the physical and chemical properties of phosphate tailings provided the basis for comprehensive utilization of phosphorus resources.

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Tesis sobre el tema "Fine tailings"

Aida, Farkish. "SAP Based Rapid Dewatering of Oil Sands Mature Fine Tailings". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24251.

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Mature fine tailings (MFT), as a mixture of residual bitumen, sand, silt, fine clay particles and water, are a byproduct of oil sands extraction. The large volume, and poor consolidation and water release ability of MFT have been causing significant economic and environmental concerns. Therefore, several studies have been implemented on finding innovative dewatering/disposal techniques. As a result, different methods have been introduced and tested at a laboratory or a field scale, yet very few of these are commercially used in the oil sands industries. Despite the extensive research, an optimal solution has not been found due to the lack of technical or economic feasibility. In the present study, a novel approach that consists of the rapid dewatering of MFT by using a super absorbent polymer (SAP) to produce dense MFT is proposed. A comprehensive laboratory investigation on the geotechnical characteristics and behavior before and after treatment of MFT is conducted. The effects of SAP based dewatering and freeze/thaw cycles on the undrained shear strength of dewatered MFT by using a vane shear apparatus are studied. Furthermore, the ability of recycled SAP to dewater and densify MFT is assessed. Finally, this study provides the results of consolidation and hydraulic conductivity testing to evaluate the void ratio versus effective stress and hydraulic conductivity of MFT. The effects on the behavior and characteristics of MFT after amendment with usage of recycled SAP are also investigated. The results indicate that SAP has the ability to significantly dewater, densify and increase the undrained shear strength of MFT. Furthermore, when subjected to freeze/thaw cycles, the MFT dewatered with SAP shows an additional increase in strength and solid content. It is also found to be possible to regenerate the polymer (still within sachets) through light thermal drying, and the regenerated SAP can still significantly dewater and thus increase the shear strength and solid content of the MFT. In addition, the obtained high solid content affects and improves the compressibility of the material, thus resulting in low initial void ratios. On the other hand, low hydraulic permeability that is derived from low initial void ratios and consolidation is improved by the freeze/thaw process due to the interconnected voids created during the freezing process.

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Masala, Srboljub. "Numerical simulation of sedimentation and consolidation of fine tailings". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ34390.pdf.

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Estepho, Mathiew. "Seepage Induced Consolidation Test : characterization of mature fine tailings". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/45786.

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Managing oil sand slurry tailings waste is a significant issue in the oil sands industry and thus accurate characterization of the tailings is required. Conventional soil characterization tests usually involve one or more limiting assumptions such as small strains and constant coefficients of consolidation and hydraulic conductivity. These limitations are significant when testing low density slurries such as dredged soils and mining waste. One unconventional test in particular, the Seepage Induced Consolidation Test (SICT) has been shown to accurately determine compressibility and permeability relations for low density slurries. The SICT was first constructed at the Colorado University (CU) in Boulder, Colorado and has been used for the past two decades to characterize phosphate slurry tailings. Over the last two years a SICT was constructed at the University of British Columbia to provide accurate consolidation characterization of oil sand waste, in particular, mature fine tailings (MFT). Benchmark testing was initially performed on kaolinite clay at the UBC laboratory and results showed the test was repeatable and comparable to results obtained at CU. Test results on MFT at UBC also proved to be in agreement with published data from CU. The use of the SICT helps in the understanding of MFT and the characterization results can be directly used in into large strain consolidation modeling such as CONDES0 1D and SoilVision’s SVOffice 1D, 2D, and 3D software programs. These and other similar models, which are dependent on the compressibility and permeability relations from the SICT, can be used in the design of waste disposal strategies at every stage of a mining project.

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Chiodza, Kudzai Godknows. "Desulphurisation of fine coal waste tailings using algal lipids". Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29892.

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The South African economy is an energy-driven economy which relies on coal to meet most of its energy demands. Coal mining has resulted in the generation of coal waste over 60 million tonnes, annually. Apart from the huge footprint of this waste, the sulphide minerals contained in the waste have resulted in the generation of acid rock drainage (ARD). A lot of techniques have been developed to prevent and mitigate ARD, however most of these techniques have fallen short in terms of meeting their desired objectives due to the long-term nature of ARD generation which can persist for hundreds of years after mine closure. This has resulted in emphasis being put on long-term prevention techniques that remove ARD risk over treatment techniques. One prevention technique which has shown good technical potential is the two-stage flotation method developed for desulphurisation of hard rock tailings and coal fines, developed at the University of Cape Town. On desulphurising coal, the first stage produces an upgraded coal product that may be sold, with the second stage used to separate the tailings from the first stage into targeted high-sulphide and low-sulphide fractions which may then be appropriately used or disposed of. An economic assessment of the process showed across a wide range of coal wastes the high cost of oleic acid used in the first stage of the process as a collector was a major contributor to the operating costs. The investigation undertaken in this thesis looked at the potential of algal lipids and their derivatives as biocollectors to replace the oleic acid collector in the desulphurisation process at the laboratory scale. A review of cost was carried out for a process that used raw algal lipids (RALs) or fatty acid methyl esters (FAMEs), which are derived from RALs through transesterification. Batch flotation experiments were used to assess the performance of the two bioflotation reagents in comparison to oleic acid and dodecane, an alternative but less successful chemical collector. The algal lipids cost review was a desktop study which was done by adapting literature data from Davis et al. (2014) which focused on economic evaluation of algal lipid biofuels production pathways. Results from laboratory experiments for two different coal waste feed samples showed that the performance of RALs and FAMEs was similar to that of oleic acid for the sample that was high in ash and sulphur, and better than oleic acid for the sample that was low in ash and sulphur. For example, the product from Site 1 discards from Waterberg had 24.37% ash and 2.76% sulphur using FAMEs, 26.13% ash and 2.56% sulphur with RALs, and 23.48% ash and 2.41% using oleic acid, at a reagent dose of 2.8 kg/t for all reagents. For Site 2 waste tailings from the Witbank area, the product had 23.17% ash and 0.72% sulphur when FAMEs were used as collector, 22.75% ash and 0.75% sulphur with RALs, and 20.18% ash and 0.74% sulphur using oleic acid, at the same reagent dose. Discards from Site 1 had an initial ash and sulphur content of 47.61% and 5.71%, respectively. Site 2 waste tailings had 25.56% ash and 0.91% sulphur before flotation. Increasing biocollector dosage resulted in higher yields with a compromise on the upgraded coal quality. The pH tests showed that the performance of the two bioflotation reagents was best at pH 4 in terms of yield. However, increasing the pH of the process from the natural pH of the sample (pH 2.7) to 7 resulted in collection of more ash and sulphur, thus reducing the product quality. The algal lipids cost review showed that RALs and FAMEs were potentially 20 to 21% cheaper than oleic acid, with more room for improvement. Both the laboratory experiments and the technical evaluation showed that algal lipids and their derivatives have the potential to replace oleic acid in the two-stage desulphurisation process for coal waste to obtain a saleable quality coal product while simultaneously decreasing the impact of ARD from coal waste.

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Seidalinova, Ainur. "Monotonic and cyclic shear loading response of fine-grained gold tailings". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46531.

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The monotonic, cyclic and post-cyclic shear response of gold tailings was investigated using constant-volume direct simple shear test device. The reconstituted gold tailings specimens normally consolidated to vertical effective stress levels ranging from 50 kPa to 400 kPa initially exhibited contractive behaviour followed by a dilative response under monotonic loading, with their shear stiffness and strength increasing with increasing initial effective confining stress. Overconsolidated specimens developed negative excess pore pressures during monotonic shear, with increasing dilative response, shear resistance, and stiffness displayed with increasing overconsolidation ratio (OCR). Overall, the monotonic behaviour of normally consolidated reconstituted gold tailings specimens is similar to the typical monotonic behaviour of normally consolidated clays and low-plastic silts; similarly, the behaviour of overconsolidated reconstituted gold tailings specimens is similar to the typical monotonic behaviour of overconsolidated clays. During cyclic loading, the tailings exhibited cumulative decrease in effective stress (or increase in equivalent excess pore-water pressure) with increasing number of loading cycles, resulting in progressive degradation of shear stiffness. The cyclic shear resistance increased with increasing OCR. The findings on the cyclic shear response of normally consolidated reconstituted gold tailings are in general agreement with those available published data on the cyclic response of different tailings, obtained from tests carried out on cyclic triaxial (TX) and DSS devices. The CRR of the gold tailings from this study, however, was found to be higher than that observed in Fraser river sand and Quartz rock powder, but in the same range as natural Fraser river silt. The post-cyclic monotonic shearing response, obtained from DSS tests, carried out on normally consolidated and overconsolidated reconstituted gold tailings specimens was also studied as a part of the current research work. The post-cyclic shear strength of normally and overconsolidated specimens, normalized to the initial effective confining stress, were observed to increase with increasing OCR. The post-cyclic consolidation volume changes experienced by the gold tailings specimens were in agreement with previously published results suggesting that post-cyclic volumetric strains would increase with increasing maximum excess pore water pressure ratio developed during cyclic loading.

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Muszalski, Piotr. "The role of ultrafine particles in oil sands fine tailings reduction". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/9700.

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Fine tailings exhibit extremely poor dewatering characteristics. The research presented here deals with two closely related projects. The first project concentrated on finding an efficient treatment method for already existing fine tailings. The second project was to evaluate process modifications aimed at fine tailings reduction and to develop an understanding of the effect of electrolyte in the process water of the characteristics of fine tailings. The behavior of ultrafines separated from fine tailings was further investigated. A $\sp2$H NMR technique was applied to determine the gelation rates for ultrafines at different electrolyte concentrations. The gelation concentration was determined using ultrafines suspensions diluted with salt solutions. Results indicate, that while gelation time varies from minutes to weeks, the gelation concentration is always about 3-4 wt%, even at an extremely high salt concentrations further floc densification (dewatering) is impossible. Although adequate floc densification could not be achieved using chemical treatment, dewatering was increased markedly using freeze-thaw (a physical method). To evaluate process modifications, samples of different process streams produced during comparison pilot plant runs performed at Syncrude Canada Ltd. were investigated. The aggregation state and distribution of ultrafines were determined in all stream samples. In conjunction with the characteristics of parent oil sand ores, results prove that the settling rate was different only up to the point where the gelation onset concentration of the ultrafines fraction was reached, regardless of the ionic composition of water. Modifications to the extraction process resulted only in marginal differences in the characteristics of the discharge streams. The final volume of fine tailings depends on the ultrafine content in the oil sand ore, and not on the type and concentration of the electrolyte in th process water. Although modified extraction processes resulted in faster settling, the modification produced "dirtier" (containing more clay) secondary froths, thus bringing about other process problems.

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Roshani, Anis. "Drying Behavior of Oil Sand Mature Fine Tailings Pre-dewatered with Superabsorbent Polymer". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36838.

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Oil sand processing to extract bitumen generates large volumes of slurry comprising water, silt, sand, clay, unrecovered bitumen, and residual chemical aides and solvents added during the extraction process. The by-product stream of the bitumen extraction is pumped into constructed tailings ponds. Managing these tailings is one of the most difficult environmental challenges for the oil sand industry. This study aims to develop a novel technique to assist in the assessment of the technologies for managing mature fine tailings (MFT) in oil sands. Innovative application of a superabsorbent polymer in the oil sands industry may provide a new method for tailings management. However, thus far, no study has addressed this research gap. In fact, fundamental knowledge of the behavior of MFTs pre-dewatered with the superabsorbent polymer could provide an important way to positively affect the speed of reclamation. To this end, comprehensive instrumentation, geo-environmental, and geotechnical analyses are carried out to obtain essential knowledge on the behavior of MFTs pre-dewatered with the polymer. The results of this study reveal that the mechanical, hydraulic, and thermal properties of the MFTs are related. Evaporation and drying shrinkage can affect the hydro-mechanical properties of the tailings and have a significant influence on the developed shear strength of the MFTs. In addition, the process-affected water includes a high concentration of the dissolved ions and organic chemicals that stem from ore extraction chemicals and tailings treatments, or that may be released from oil sands ores. Through the application of a superabsorbent polymer in the dewatering of oil sand MFTs, the chemical components are entrapped in the polymer chains, thus limiting the mobility of the major ions and trace metals in water bodies beneath the oil sand tailings pond. Results show that the application of the superabsorbent polymer considerably reduces the rate of drainage from the oil sand MFTs into water bodies, which can help mitigate the risk of seepage. The author believes that the superabsorbent polymer dewatering technique can be considered as an environmentally friendly promising approach for management of oil sands MFTs. This new technique can accelerate the pace of reclamation and thus minimize the footprint of the oil industry in Canada.

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Proskin, Samuel Albert. "A geotechnical investigation of freeze-thaw dewatering of oil sands fine tailings". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/NQ34823.pdf.

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Alshawmar, Fahad Abdulaziz. "Shaking Table Testing of Geotechnical Response of Densified Fine-Grained Soils to Cyclic Loadings: Application to Highly Densified Tailings". Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41892.

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Liquefaction is a major challenge in geotechnical engineering in which soil strength and stiffness are compromised due to earthquake activity. Understanding and predicting the behaviour and liquefaction susceptibility of soils under cyclic loading is a critical issue in civil engineering, mining and protective engineering. Numerous earthquake-induced ground failure events (e.g., substantial ground deformation, reduced bearing capacity) or liquefaction in natural fine-grained soils or manmade fine-grained soils (i.e., fine tailings) produced by mining activities have been observed and reported in the literature. Tailings are manmade soils that remain following the extraction of metals and minerals from mined ore in a mine processing plant. Traditionally, such tailings are stored in surface tailings impoundments at the mine’s surface. However, geotechnical and environmental risks and consequences related to conventional tailings impoundments have attracted the attention of the engineering community to develop novel methods of tailings disposal and management to minimize geotechnical and environmental risks. Thus, engineers have introduced and implemented innovative tailings technologies—thickened tailings and paste tailings—as cost-effective means for tailings management in mining operations. As both thickened tailings and paste tailings have lower water content and higher solid content than tailings in conventional impoundments, these tailings may be more resistant to liquefaction. However, it should be noted that the seismic or cyclic behaviour of these thickened and paste tailings, with and without heavy rainfall effects, are not fully understood. There is little technical information or data about the behaviour and liquefaction of thickened and paste tailings under seismic or cyclic loading conditions. The objective of the present PhD research is to investigate the response of layered thickened and paste tailings deposits, with and without heavy rainfall effects, to cyclic loads by conducting shaking table tests. To simulate the field deposition of thickened and paste tailings, tailings were deposited in three thin layers in a flexible laminar shear box (FLSB) attached to the shaking table equipment. A sinusoidal seismic loading at a frequency of 1 Hz and peak horizontal acceleration of 0.13g was applied at the bottom of the layered tailings deposits. Acceleration, displacement and pore water pressure responses to the cyclic loading were monitored at the middle depth of each layer of the tailings deposits. Regarding the acceleration response of these thickened and paste tailings deposits (without the effect of heavy rainfall), there was no difference between the middle of the bottom and middle layers or at the base of the shaking table. However, the acceleration at the middle of the top layer differed from the acceleration at the base of the shaking table. Throughout shaking, the layered tailings deposits (with and without the effect of heavy rainfall) exhibited contraction and dilation responses. The excess pore water pressure ratios of the layered thickened tailings deposit that was not exposed to heavy rainfall prior to shaking were found to exceed 1.0 during shaking. However, for the layered paste tailings deposit that was not exposed to the effect of heavy rainfall prior to shaking, the excess pore water pressure ratios were found to be lower than 0.85 during shaking. This reveals that without the effect of heavy rainfall, the layered thickened tailings deposit was susceptible to liquefaction, whereas the layered paste tailings deposit was resistant to liquefaction during shaking. The excess pore water ratios of the layered thickened and the paste tailings deposits that were exposed to heavy rainfall prior to shaking were found to be lower than 0.8 during shaking. This reveals that with the effect of heavy rainfall, the layered thickened and paste tailings deposits were resistant to liquefaction during shaking. The results and findings of this PhD research thus provide valuable information for the implementation of tailings in earthquake-prone areas.

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Holowenko, Fervone M. "Methanogenesis and fine tailings waste from oil sand extraction, a microcosm-based laboratory examination". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0010/MQ60126.pdf.

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Libros sobre el tema "Fine tailings"

Niemi, Kristen M. INCO tailings as a fines supplement. Sudbury, Ont: Laurentian University, 1998.

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Overbeek, P. W. The recovery of chromite fines from tailings dumps. Randburg, South Africa: Council for Mineral Technology, 1986.

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Placer gold from tailings. Moscow: Publishing House of Moscow State Mining University, 2002.

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Report on groundwater and surface water monitoring: Victoria Junction fine tailings facility. [S.l.]: Environmental Canada, Environmental Protection Service, 1985.

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Fuhr, B. J. Catalogue of technologies for reducing the environmental impact of fine tailings from oil sand processing (Report). Conservation and Reclamation Council, Reclamation Research Technical Advisory Committee, 1993.

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Flood deposits of transported mill tailings in Nevada and Utah: Evidence for tailings dam failures and implications for risk assessment (Open-file report). U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Nash, J. Thomas. Geochemical studies of mines, dumps, and tailings as sources of contamination, upper Animas River watershed, Colorado (Open-file report). U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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Capítulos de libros sobre el tema "Fine tailings"

Mikula, Randy J., Kim L. Kasperski, Robert D. Burns y Mike D. MacKinnon. "Nature and Fate of Oil Sands Fine Tailings". En Suspensions: Fundamentals and Applications in the Petroleum Industry, 677–723. Washington, DC: American Chemical Society, 1996. http://dx.doi.org/10.1021/ba-1996-0251.ch014.

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Maruthupandian, Surya, Napoleana Anna Chaliasou y Antonios Kanellopoulos. "Recycling Mine Tailings for a Sustainable Future Built Environment". En Springer Proceedings in Energy, 163–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_21.

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AbstractThe future sustainable built environment focuses mainly on environmental conservation and technological innovation and development. However, with infrastructure development, the consumption of raw materials such as cement, gypsum, sand, and stones increases. Therefore, use of industrial waste as raw material in construction shall be proposed as a sustainable and environment friendly alternative. Also, the higher demand for mineral commodities have led to increased mining and hence increased mining waste. The mine tailings being the wastes from rocks and minerals processing, are generally rich in Si, Ca, Al, Mg, and Fe, and also have considerable amounts of heavy metals and metalloids such as Pb, As, Co, Cu, Zn, V, and Cr. When tailings contain sulphide minerals, it may also lead to acid mine drainage. This makes the effective and efficient recycling and reuse of mine waste a major environmental concern. However, the physical, mineralogical and chemical composition of the mine tailings renders it a suitable material for use in civil engineering applications. This paper discusses the use of mine tailings of different origins for different civil engineering applications such as bricks, ceramics, fine aggregates, coarse aggregate and cementitious binders. This approach has a potential to reduce the demand on existing natural resources to face the demands of the exponentially developing infrastructure.

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Gao, Meng-Yao, Sung-Ching Chen y Wei-Ting Lin. "Effect of Using Copper Tailings as Replacement of Fine Aggregate for Concrete Pavement". En Finding Solutions of the 21st Century Transportation Problems Through Research and Innovations, 91–101. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79638-9_8.

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Dong, Jianjun y Guofeng Zheng. "Strength and Deformation Characteristics of Unsaturated Fine-Grained Tailings Soil Under Variable Moisture Content". En Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 173–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_20.

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Jain, Amit y Baojie Zhang. "Implementation of Fine Screening Technology in Fine Coal Tailing Circuits". En XVIII International Coal Preparation Congress, 357–63. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_53.

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Singh, K. M. P., G. Udayabhanu y T. Gouricharan. "Coal Hydrophobicity and the settling behaviour of coal fines tailings". En XVIII International Coal Preparation Congress, 451–56. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_68.

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Moffett, R. "Treatment of fluid fine tailings with silica". En Tailings and Mine Waste 2010, 347–53. CRC Press, 2010. http://dx.doi.org/10.1201/b10569-44.

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Sobkowicz, J. "History and developments in treatment of oil sands fine tailings". En Tailings and Mine Waste 2010, 11–30. CRC Press, 2010. http://dx.doi.org/10.1201/b10569-4.

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Yao, Y., A. van Tol, B. Everts y A. Mulder. "Filtration tests on PVD filter jackets in fine oil sands tailings". En Tailings and Mine Waste 2010, 355–65. CRC Press, 2010. http://dx.doi.org/10.1201/b10569-45.

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Bazin, C., D. W. Scott y L. J. Surges. "Application of hydrocyclones to the recovery of pyrite from plant tailings". En Production and Processing of Fine Particles, 419–25. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036448-3.50047-5.

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Actas de conferencias sobre el tema "Fine tailings"

Wells, Patrick, Adrian Revington y Oladipo Omotoso. "Mature fine tailings drying — technology update". En 14th International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2011. http://dx.doi.org/10.36487/acg_rep/1104_15_wells.

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Jonasson, R. G., Z. Zhou, R. Schutte y L. Danielson. "Chemical Disequilibrium In Oil Sand Fine Tailings". En Annual Technical Meeting. Petroleum Society of Canada, 1991. http://dx.doi.org/10.2118/91-122.

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Slottee, Steve y Jerold Johnson. "Paste Thickener Operation of Fine Coal Tailings". En Eleventh International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2008. http://dx.doi.org/10.36487/acg_repo/863_12.

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Jonasson, R., Z. Zhou, R. Schutte y L. Danielson. "Chemical Disequilibrium In Oil Sand Fine Tailings". En Annual Technical Meeting. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2523/91-122.

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Lowe, Jason. "A new approach to fine solids dewatering". En 15th International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2012. http://dx.doi.org/10.36487/acg_rep/1263_12_lowe.

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Cabrera, S. C. Motta, J. Bryan y A. Kantzas. "Estimation of Bitumen and Clay Content in Fine Tailings". En Canadian International Petroleum Conference. Petroleum Society of Canada, 2007. http://dx.doi.org/10.2118/2007-074.

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Yuan, X., H. Li, J. Zhou y L. Zhao. "Advancements of fluid fine tailings treatment technologies through fundamental research". En 22nd International Conference on Paste, Thickened and Filtered Tailings. Australian Centre for Geomechanics, Perth, 2019. http://dx.doi.org/10.36487/acg_rep/1910_22_yuan.

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Tang, Ke, Xuesong Mao y Xinlei Tang. "Study on application of iron tailings fine aggregate in concrete". En Proceedings of the 2018 3rd International Conference on Advances in Materials, Mechatronics and Civil Engineering (ICAMMCE 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/icammce-18.2018.40.

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Moreno, Juan, Samuel Kendall y Andres Ortiz. "Dewatering options for management of fine gold tailings in Western Australian Goldfields". En 21st International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2018. http://dx.doi.org/10.36487/acg_rep/1805_34_moreno.

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Penna, D. y Waldyr de Oliveira Filho. "Constitutive relation between void ratio and undrained shear strength for iron fine tailings". En 16th International Seminar on Paste and Thickened Tailings. Australian Centre for Geomechanics, Perth, 2013. http://dx.doi.org/10.36487/acg_rep/1363_51_penna.

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Informes sobre el tema "Fine tailings"

Amaratunga, L. M. y A. Annor. Agglomeration of fine mill tailings for backfilling and disposal. Natural Resources Canada/CMSS/Information Management, 1990. http://dx.doi.org/10.4095/328791.

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