Relevant bibliographies by topics / Gypsum

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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 'Gypsum'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 July 2024

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Journal articles on the topic "Gypsum"

1

Anikwe., M. A. N., Nnamnani D.E., Ikengannyia E.E., J. C. Eze., and Obidike-Ugwu, E. O. "SOIL TILLAGE VARIANTS AND SULPHUR FERTILIZATION AFFECT NODULATION, N2 FIXATION AND YIELD OF BAMBARA GROUNDNUT (Vigna subterreana) IN SOUTHEAST NIGERIA." Journal CleanWAS 7, no. 2 (April 19, 2023): 76–82. http://dx.doi.org/10.26480/jcleanwas.02.2023.76.82.

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Management efficiency can increase crop productivity through enhanced N2 fixation in the plant-soil system. This study examined soil tillage variants and sulphur fertilization effects on nodulation, N2 fixation effectiveness and yield of Bambara groundnut [Vigna subterranea] in a degraded Ultisol in Agbani Enugu, Southeast Nigeria. Twenty-four experimental units were laid out in a Randomized Complete Block Design (RCBD). The six treatments comprised No-Till+No Gypsum (NTGo), No-Till+Gypsum1 (NTG1), No-Till+Gypsum2 (NTG2), Till+No Gypsum (TGo), Till+Gypsum1 (TG1), and Till+Gypsum2 (TG2). No-till+gypsum2 plots had significantly higher soil N content than each corresponding No-till+no gypsum plot by 15-40 %. At 30 DAP, the plots treated with till+gypsum1 (21 kg/ha), till+gypsum2 (42 kg/ha), no-till+gypsum2 (42 kg/ha), no-till+gypsum1 (21 kg/ha), and till+no gypsum had 62-63 % higher soil sulphur content (P= 0.05) than the control plots. The nodule count per plant in plots treated with no-till+gypsum2 (42 kg/ha) was greater than that in the control plot, plots with no-till+gypsum1 (21 kg/ha), and plots with till+gypsum2 (42 kg/ha) by 72-74 % at 30, 60, and 90 DAP across two seasons. Compared to the untreated plots, nodulation effectivity was raised by 79-89 % in the No-till+gypsum2 plot. The plots treated with no-till+gypsum2 (42 kg/ha) had the highest yield (0.94 t/ha), followed by plots treated with no-till+gypsum1 (42 kg/ha) with 0.93 t/ha dry seed yield and till+gypsum2 (42 kg/ha) with 54-55 % greater yield (P=0.05) than the control plot. Sulphur treatment boosted nodulation by 68 % and nodule effectiveness by about 78 %. The no-till+Gypsum2 application enhanced the average yield of Bambara groundnuts by 56 %. The soil application of S enhanced the amount of accessible S in the soil. Results show that the tillage system and S fertilization impact Bambara groundnut on degraded Ultisols. Dry matter yield was best with a high S supply in both S increments and no-till systems. The number and effectiveness of nodules increased at different S rates and no-tillage. Because of the increased S application rate, there was a considerable increase in N accumulation due to a greater N2 fixation rate. The study recommends using no-till systems and sulphur fertilization practices to enhance crop productivity, especially in degraded Ultisols. The study provides valuable insights into sustainable agriculture practices that boost yields while conserving soils.
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Xie, Zhiqing, Xiaoming Liu, Zengqi Zhang, Chao Wei, and Jiarui Gu. "Application of the Industrial Byproduct Gypsum in Building Materials: A Review." Materials 17, no. 8 (April 16, 2024): 1837. http://dx.doi.org/10.3390/ma17081837.

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The industrial byproduct gypsum is a general term for byproducts discharged from industrial production with calcium sulfate as the main ingredient. Due to the high number of impurities and production volume, the industrial byproduct gypsum is underutilized, leading to serious environmental problems. At present, only desulfurization gypsum and phosphogypsum have been partially utilized in cementitious materials, cement retarders, etc., while the prospects for the utilization of other byproduct gypsums remain worrying. This paper mainly focuses on the sources and physicochemical properties of various types of gypsum byproducts and summarizes the application scenarios of various gypsums in construction materials. Finally, some suggestions are proposed to solve the problem of the industrial byproduct gypsum. This review is informative for solving the environmental problems caused by gypsum accumulation.
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Ni, Tie Quan, Chang Jun Ke, and Bing Yuan. "Effects of Modified Gypsum on Autoclaved Products Strength." Advanced Materials Research 374-377 (October 2011): 1235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1235.

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The modified tests are put on by selecting gypsum from different habitats, using doping technology and calcination technology. The tests results can be summarized as follows. Different kinds of gypsums have different effects on the strength of fly ash autoclaved products, and so do the gypsums collected from different habitats. Low-purity gypsums helps to improve the strength of autoclaved products. Low-purity scatter of gypsum can be achieved by means of natural doping and artificial doping, and natural doping is better. Calcined gypsum could increase the strength of fly ash products within a certain range, and the best calcining temperature is about 650°C.
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Jacques, S. D. M., A. González-Saborido, O. Leynaud, J. Bensted, M. Tyrer, R. I. W. Greaves, and P. Barnes. "Structural evolution during the dehydration of gypsum materials." Mineralogical Magazine 73, no. 3 (June 2009): 421–32. http://dx.doi.org/10.1180/minmag.2009.073.3.421.

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AbstractThe dehydration of pure and waste gypsums has been examined using in situ synchrotron angledispersive X-ray diffraction. Pure gypsum was studied under a number of defined environments; various industrial waste gypsums were also studied under a common standard environment. It is found that the dehydration of gypsum to anhydrite proceeds via the hemihydrate and γ-anhydrite phases and the interplay and behaviour of these phases has been determined by full structural ‘Rietveld’ refinement. In the study of the pure gypsum system, the hemihydrate structure is shown to be preserved as water is lost. A ‘zero-water hemihydrate’ is observed before refinement in the higher symmetry γ-anhydrite cell is possible. The waste gypsum materials studied showed significant differences in the temperatures at which key transformation events occurred; these observations raise implications concerning the re-use of by-product gypsum materials. Finally, high temperature data are re-examined in the search for a variation of the anhydrite structure.
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Zhang, Ye, Peng Xuan Duan, Bao Sheng Jia, and Fan Zhang. "A Comparative Study on the Basic Properties of FGD Gypsums." Advanced Materials Research 374-377 (October 2011): 1758–63. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1758.

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Compared with natural gypsum, the basic properties of FGD gypsum are studied based on the test results and then the influence of FGD gypsum’s chemical constituents, impurities and particle size distribution on its products is analyzed. The results indicate the impurities play an important role on the FGD gypsum behavior. Finally, the differences between FGD gypsum and natural gypsum are summarized.
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Darmawan, Imelda, Octarina Willy, and Johan Arief Budiman. "Setting time of construction gypsum, dental plaster, and white orthodontic gypsum." Journal of Dental Research, Dental Clinics, Dental Prospects 14, no. 3 (September 21, 2020): 167–70. http://dx.doi.org/10.34172/joddd.2020.036.

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Background. Dental plaster, white orthodontic gypsum, and construction gypsum have β-hemihydrate particles. Setting time is an essential property of dental gypsum, which can affect the strength of the material. This research aimed to compare construction gypsum, dental plaster, and white orthodontic gypsum’s initial and final setting times. Methods. Three groups were included in this experimental laboratory study: construction gypsum (A), dental plaster (B), and white orthodontic gypsum (C). Each group consisted of 10 samples. Gypsum manipulation consisted of using 120 gr of powder and 60 mL of water. Gypsum powder and water were mixed using a gypsum mixer at 120 rpm. A homogeneous mixture was poured into a mold, and the setting time was measured using a Gillmore needle, according to ASTM C266-03. The initial setting time test was measured using 113.4 grams and a 2.12-mm needle. The final setting time was measured using 453.6 grams and a 1.06-mm needle. This test was repeated until the needle failed to penetrate the gypsum’s surface. All the data were analyzed with one-way ANOVA and post hoc Tukey tests using SPSS 23. Results. The average initial setting time for groups A, B, and C were 10.39±1.19, 16.17±1.40, and 24.46±1.51, respectively. The average final setting time for groups A, B, and C were 15.97±0.79, 24.31±0.88) and 33.37±0.66, respectively. One-way ANOVA and post hoc Tukey tests showed significant differences in the initial and final setting times between the three groups (P<0.05). Conclusion. There were differences in setting time between dental plaster, white orthodontic gypsum, and construction gypsum. The construction gypsum’s setting time is suitable as a type II dental gypsum, according to ADA No.25.
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Inazumi, Shinya, Hiroaki Sano, and Mikio Yamada. "Estimation of gypsum hemihydrate content in recycled gypsums derived from gypsum boards." Journal of Material Cycles and Waste Management 18, no. 1 (October 24, 2014): 168–76. http://dx.doi.org/10.1007/s10163-014-0319-x.

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López-Pedrajas, D., M. Jiménez-Vázquez, A. M. Borreguero, F. J. Ramos, I. Garrido, J. F. Rodríguez, and M. Carmona. "Nanoencapsulated PCM slurries for the development of thermoregulating gypsums." Journal of Physics: Conference Series 2116, no. 1 (November 1, 2021): 012104. http://dx.doi.org/10.1088/1742-6596/2116/1/012104.

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Abstract Gypsums with improved thermal properties have been obtained using a thermoregulatory nanocapsulated slurry (NPCS) as additive. In order to determine the effects of the slurries in the gypsum, physical, mechanical and thermal properties of the different composite materials (gypsum – polystyrene nanoparticles (PS) or nanocapsules (NPCM)) have been studied. Concentrated slurries from polystyrene nanoparticles without (PSS) and with encapsulated phase change material (NPCS) have been synthesized. Firstly, gypsum blocks made of nanoparticles/hemihydrate with mass ratios ranging from 0.0 to 0.42 have been produced from PSS, in order to determine the optimal weight ratio with the best mechanical/physical characteristics. Then, the thermal gypsum block from NPCM/hemihydrate has been prepared at the selected weight ratio. Although PS and NPCM addition reduces the mechanical properties, all the developed materials satisfied the mechanical European regulation EN 13279-2 which limits the mechanical characteristics of gypsums composites. The gypsum composites with PS nanoparticles presented a reduction of the thermal conductivity, so these materials can be used as insulating material. The gypsum composite with NPCM/Hem = 0.3 had an improvement in the thermal storage capacity of 88.76 % and seems to be a good alternative for applying the thermal energy storage technology in buildings.
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Wankhade, Sattyam V., Kaushal V. Sanghavi, Vilas Rajguru, and Jyoti Lokade. "A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study." International Journal of Prosthodontics and Restorative Dentistry 3, no. 1 (2013): 1–6. http://dx.doi.org/10.5005/jp-journals-10019-1067.

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ABSTRACT Background and objectives This in vitro study evaluated and compared the abrasion resistance of types IV and V gypsums, resin-modified type IV and type V gypsums, synthetic gypsum, and epoxy resin die material at two different time intervals spanning a period of 24 hours. Materials and methods A total of 10 dies of each die material were fabricated and tested for abrasion resistance at each time interval. An average of five readings was taken for the test, measuring the rate of abrasion of the materials. Results All the tested properties of the epoxy resin material were far superior to those of the other materials (being tested). Resin-modified type IV gypsum had significantly better abrasion resistance than its type V counterpart at setting. However, when tested at 24 hours, both materials had comparable resistance to abrasion, which was the highest among the gypsum-based materials. Interpretation and conclusion Epoxy die resin had the most superior physical properties of all. A significant decrease in the rate of abrasion (-38 to -83%) was noted, when the gypsumbased products were tested at 24 hours. From the data obtained in this study, it is recommended that when gypsum-based materials are used, to wait at least 24 hours prior to separating casts from impressions (and subsequent laboratory procedures) to avoid damage to the casts and dies. Abbreviations RR IV: Resin modified type IV gypsum; RR V: Resin modified type V gypsum; S: Synthetic gypsum; V: Type V gypsum; IV: Type IV gypsum. How to cite this article Wankhade SV, Sanghavi KV, Rajguru V, Lokade J. A Comparative Evaluation of Six Commonly used Types of Die Materials for the Property of Abrasion Resistance, at Two Time Intervals: An in vitro Study. Int J Prosthodont Restor Dent 2013;3(1):1-6.
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Wang, Junjie, and Engui Liu. "Physicomechanical Properties of Gypsum with Mineral Additions at Elevated Temperatures." Coatings 13, no. 12 (December 15, 2023): 2091. http://dx.doi.org/10.3390/coatings13122091.

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Gypsum, from either nature or industrial by-products, can be a lower-cost and cleaner alternative binder to Portland cement used in construction projects, such as affordable housing in developing countries. Although various building products have successfully used gypsum as the binder, some drawbacks of this material have still been claimed, for example, in the aspects of mechanical strength and some other physical properties. Using mineral additions to gypsum seems to be a possible solution to create composite gypsum with improved properties. This work has investigated the possibility of two common minerals (silica flour and talc powder) in modifying composite gypsum’s physical and mechanical performance at elevated temperatures (100–1100 °C), including hydration, strength, thermal conduction and stability, and microstructure. The results suggest that 10% gypsum replacement by silica flour or talc powder modifies gypsum’s physical and mechanical properties, with silica flour performing better than talc powder. The performance of composite gypsum at elevated temperatures depends on the treatment temperature and reflects the combined effects of gypsum phase change and the filler effects of silica flour or talc powder. Thermal treatment at ≤200 °C increased the thermal resistance of all gypsum boards but decreased their compressive strength. Thermal treatment at ≥300 °C significantly increased the compressive strength of gypsum with silica flour and talc powder but induced intensive microcracks and thus failed the thermal insulation. This investigation indicates that silica flour can potentially raise the mechanical performance of gypsum. At the same time, talc powder can hold water and lubricate, which may help with the continuous hydration of gypsum phases and the rheology of its mixtures.
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Dissertations / Theses on the topic "Gypsum"

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Vespia, Maren. "Gypsum Bonnet." The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-06132010-165408/.

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Walworth, James. "Using Gypsum in Southwestern Soils." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/144801.

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Rahmanian, Ima. "Thermal and mechanical properties of gypsum boards and their influences on fire resistance of gypsum board based systems." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/thermal-and-mechanical-properties-of-gypsum-boards-and-their-influences-on-fire-resistance-of-gypsum-board-based-systems(d8eb4bf5-706a-4264-911f-9584ebfbbc83).html.

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Gypsum board assemblies are now widely used in buildings, as fire resistant walls or ceilings, to provide passive fire protection. The fire resistance of such systems is fundamentally due to the desirable thermal properties of gypsum. Yet there is wide variability in reported values of thermal properties of gypsum at high temperatures and a lack of understanding of its integrity in fire. To evaluate the fire protection performance of gypsum board assemblies, it is essential to quantify its thermal properties and obtain information on its mechanical properties at high temperatures. Gypsum boards shrink and crack at high temperatures, and this leads to collapse of parts of the gypsum boards in fire. Fall-off of gypsum in fire affects the fire resistance of the assembly considerably, and cannot be overlooked when evaluating the fire resistance of gypsum board assemblies. The current research proposes a model to define the temperature-dependent thermal properties of gypsum boards at high temperatures. Thermal conductivity of gypsum is considered as the most influential parameter in conduction of heat through gypsum, and a hybrid numerical-experimental method is presented for extracting thermal conductivity of various gypsum board products at elevated temperatures. This method incorporates a validated one-dimensional Finite Difference heat conduction program and high temperature test results on small samples of gypsum boards. Moreover, high temperature mechanical tests have been performed on different gypsum board products; thermal shrinkage, strength and stress-strain relationships of gypsum products at elevated temperatures are extracted for use in numerical mechanical analysis. To simulate the structural performance of gypsum boards in fire, a two-dimensional Finite Element model has been developed in ABAQUS. This model successfully predicts the complete opening of a through-thickness crack in gypsum, and is validated against medium-scale fire tests designed and conducted as part of this research. Gypsum fall-off in fire is a complex phenomenon; however, it is believed that delaying the formation of through-thickness cracking will delay falling off of gypsum in fire, and hence improve the fire resistance of gypsum board assemblies. Finally, a study has been performed on the effects of various detailing parameters in gypsum board wall assemblies, and recommendations are offered for improving the fire resistance of such systems.
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Lo, Nigel. "Crystallization of gypsum in zinc sulphate solution." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ44024.pdf.

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Lo, Nigel. "Crystallization of gypsum in zinc sulphate solution." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20507.

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The purpose of this research is to use a mathematical model to study the removal of calcium in the form of gypsum from zinc sulphate solution by cooling from 80ºC to 30ºC in a batch crystallizer. Factors such as cooling-rates, initial solution composition, and seed amount are analyzed. Using the simulation module developed, it is found that the removal of calcium can be improved by operating at a high temperature, which speeds up both the growth and nucleation kinetics, and produces a higher supersaturation by lowering the equilibrium molality of calcium ion in solution. Also, the addition of seed can reduce the activation energy requirement for nucleation by providing favourable surface for the formation of nuclei and enhance crystallization. Finally, experiments are performed to see if the results qualitatively support the simulation findings.
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Cave, Sion. "Gypsum calcination in a fluidised bed reactor." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/6800.

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Gypsum (calcium sulphate dihydrate) is of great industrial importance with over 95,000 ktonnes being used in the world per annum. The greatest use of gypsum is in the production of plaster (calcium sulphate hemihydrate) for use as an interior finisher. Plaster is produced by the calcination (thermal decomposition) of gypsum. The most popular design is a continuous calciner where gypsum is fed continuously and is directly heated by hot air. There are a number of different phenomena occurring within a calciner, including heat transfer, mass transfer, particle and gas mixing, elutriation and the dehydration reaction itself. All these processes interact with each other. Although a lot of research has been carried out in these areas already, the literature has been found to contain significant discrepancies. This study contains experimental work which has been carried out in order to better understand the physical processes occurring within a gypsum calciner. The rate of dehydration of gypsum (35-67μm in diameter) has been studied in a fluidised bed reactor. Experiments were carried out at bed temperatures of 100 to 170°C. The fluidising gas was air with water vapour pressures of 0.001 to 0.30 atm. The dehydrations were under differential conditions. The results show that the dehydration under these conditions can be successfully modelled using the two dimensional Avrami-Er'ovev expression. A study of the fluidisation and elutriation properties of gypsum in batch vessels (cylindrical and conical) has been carried out. The mechanics of elutriation has been investigated and modelled for various freeboards, superficial gas velocities and air humidities. Tracer tests have also been carried out on a laboratory scale continuous conical kettle. Sodium carbonate was used as the inert tracer material. Runs were carried out at different air and gas flowrates and different bed temperatures. Residence time distributions were elucidated. Finally, the above experimental data and component models have been investigated for their applicability to producing a model of the laboratory scale gypsum calciner.
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Ottman, Mike, Jack Stroehlein, and Tom Christian. "Gypsum Application on Wheat at Coolidge, 1987." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/203768.

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Gypsum is applied to alleviate the problems associated with sodium- affected soils, such as surface crusting and impeded water infiltration. Due to the uncertainties in identifying gypsum-responsive sites, field studies were initiated to further our understanding of conditions responsible for the response of wheat to gypsum applications. Gypsum was applied at rates ranging from 0 to 4 T/A on two commercial farms near Coolidge, AZ. No differences in wheat grain yield, grain protein, stand, grain bushel weight, or plant height were detected at the 5% probability level at either site with the exception of increased plant height at one site. The positive benefits of gypsum have been documented in the past with certain soils; this study is just one of many required to more positively define gypsum-responsive sites in Arizona. The economics of gypsum application involves delivery and application cost of gypsum and the change in yield and value of subsequent crops.
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Rice, Kristi Dawn. "Effects of abiotic factors and cattle grazing on gypsum outcrop plant communities in the Cimarron Gypsum Hills, northwestern Oklahoma /." Read online, 2008. http://library.uco.edu/UCOthesis/RiceK2008.pdf.

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Adams, Jeffrey F. "Gypsum scale formation in continuous hydrometallurgical neutralization reactors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ45576.pdf.

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Verbaan, Cornelis Niels Martijn. "Impurity uptake duting gypsum crystallisation in wastewater treatment." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33350.

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A common wastewater treatment process practised in zinc production plants is the single stage mixing of acidic wastewaters with slaked lime, inducing the reactive precipitation of fine (∼1 mum) gypsum (CaSO 4·2H2O) and other solids with a solids density of less than 10%. These solids report to tailings ponds for containment.
The solid-liquid separation step would be more efficient if the size and density of the precipitated solids were increased. Tailings pond life would be increased if the solids density of the precipitated solids was improved. It is the scope of this thesis to report on how high density and clean gypsum may be produced by implementing staging and product recycling. According to this work a staged neutralisation process (each neutralisation reactor operating at different pH) leads to production of large sized gypsum crystals with a high solids density. A continuous lab scale circuit run with synthetic zinc plant effluent produced large (∼100 mum) gypsum crystals with a solids density of 35%.
The effect of various metal impurities (such as Zn, Mn, Mg, Fe(II), Cd, Na) in concentrations ranging from 0.1 g/l to 10 g/l on the morphology of gypsum and their uptake by gypsum is investigated with the view of ultimately controlling gypsum contamination. By implementing staging and product recycling gypsum was produced containing less than 0.025% zinc and minor quantities of other elements hence meeting all industrial specifications for synthetic gypsum.
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Books on the topic "Gypsum"

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Branch, Canada Mines, ed. Report on the gypsum deposits of the Maritime provinces. Ottawa: Govt. Print. Bureau, 1997.

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Company, Grand River Gypsum, ed. The Grand River Gypsum Company: Has entirely new and improved machinery for the manufacture of pure white land plaster .. [S.l: s.n., 1986.

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Davis, Lawrence L. Gypsum. Washington, D.C: U.S. Department of the Interior, Bureau of Mines, 1992.

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Association, Gypsum Products Development, ed. Gypsum today. Gravesend: Gypsum Products Development Association, 1987.

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Cole, L. Heber. Gypsum in Canada: Its occurrence, exploitation, and technology. Ottawa: Govt. Print. Bureau, 1997.

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Cole, L. Heber. Le gypse du Canada: Ses gisements, son exploitation, et sa technologie. Ottawa: Division des mines, 1997.

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Prud'homme, Michel. The gypsum products industry. Ottawa, Ont: Energy, Mines and Resources Canada, Minerals = Energie, mines et ressources Canada, Minéraux, 1986.

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Pressler, Jean W. Gypsum: A chapter from Mineral facts and problems, 1985 edition. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Wright, R. E. The gypsum industry in Nova Scotia: Present status and future prospects. Kingston, Ont: Centre for Resource Studies, Queen's University, 1985.

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K, Bezys R., Muir J. E, and Haines Technology Associates, eds. Gypsum in Northern Ontario: Resources and market potential. [Toronto]: Ontario Ministry of Northern Development and Mines, 1990.

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Book chapters on the topic "Gypsum"

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Gooch, Jan W. "Gypsum." In Encyclopedic Dictionary of Polymers, 353. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5741.

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Sanz, Joaquim, Oriol Tomasa, Nor Sidki-Rius, and Nor Sidki-Rius. "Gypsum." In Elements and Mineral Resources, 355–57. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85889-6_89.

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Singh, Manjit. "Gypsum in Cement Industry." In Gypsum & Gypsum Products, 101–21. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-4.

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Singh, Manjit. "Production of Calcined Gypsum or Gypsum Plaster." In Gypsum & Gypsum Products, 23–66. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-2.

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Singh, Manjit. "Rapid Wall Gypsum Panels/Gyperete." In Gypsum & Gypsum Products, 249–66. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-8.

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Singh, Manjit. "Standardisation of Gypsum and Gypsum Products." In Gypsum & Gypsum Products, 325–49. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-11.

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Singh, Manjit. "By-product Gypsum." In Gypsum & Gypsum Products, 67–100. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-3.

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Singh, Manjit. "Market Potential Assessment of Gypsum Industry." In Gypsum & Gypsum Products, 291–323. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-10.

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Singh, Manjit. "Gypsum Building Products." In Gypsum & Gypsum Products, 149–98. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-6.

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Singh, Manjit. "Use of By-product Gypsum in the Production of Super Sulphated Cement." In Gypsum & Gypsum Products, 123–47. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345008-5.

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Conference papers on the topic "Gypsum"

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Wang, Yu, Yu Dong, Xuesong Lu, and Aoying Zhou. "GypSum." In ICPC '22: 30th International Conference on Program Comprehension. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3524610.3527903.

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"PCEs Molecular Structure Formation for Gypsum and Cement-Gypsum Binders." In SP-354: Superplasticizers and Other Chemical Admixtures in Concrete - Conference Proceedings. American Concrete Institute, 2022. http://dx.doi.org/10.14359/51736076.

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Inazumi, Shinya, Hiroaki Sano, Mikio Yamada, and Hsin Ming Shang. "Availability of Density Measuring Methods Estimating Gypsum Hemihydrate Content in Reclaimed Gypsums." In Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413432.023.

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McMullin, Kurt, and Dan Merrick. "Gypsum Wall Damage Investigation." In Structures Congress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/41016(314)134.

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Chengxin, Y., L. Ji, Z. Feng, Z. Xuliang, L. Huiliang, and L. Yunhu. "Study on Density and Chloride Ion Concentration of Undersaturated Brine Drilling Fluid in Ultra-Deep Gypsum-Salt Rock Formation with Weak Interlayers." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0727.

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ABSTRACT The ultra-deep gypsum-salt rock formation with weak interlayers often has two complicated conditions: blockage and lost circulation, and the window of safe drilling fluid density is narrow. Only by increasing the density of drilling fluid cannot solve the problem of well diameter reduction caused by gypsum-salt rock creep. It is significant to study how to solve the blockage problem by using reasonable chloride ion concentration of undersaturated brine drilling fluid to dissolve gypsum-salt rock sidewall. This study carried out creep and dissolution experiments on the gypsum-salt rock. According to the creep and dissolution law, the borehole diameter variation model of gypsum-salt rock considering dissolution and creep was established. This model is used to analyze the borehole stability of the Middle Cambrian strata in a well in Tarim Basin, and the predicted results agree the actual situation. This study can guide safe drilling in ultra-deep gypsum-salt rock formations with weak interlayers. INTRODUCTION The Middle Cambrian strata (more than 6000 m) in Tarim Basin developed large sections of giant thick gypsum-salt rock formation with weak interlayers. In the drilling of ultra-deep gypsum-salt rock formations with weak interlayers, the low density of drilling fluid in the borehole will lead to the risk of blockage, and the high density of drilling fluid will increase the risk of lost circulation, which brings challenges to drilling operations[1]. The creep of gypsum-salt rock has been studied in depth. Scholars analyzed the influence of temperature and stress on the creep of gypsum-salt rock through creep experiments [2-4] and established various constitutive models to describe the creep of gypsum-salt rock [5-7]. However, for gypsum-salt rock formations with weak interlayers, lost circulation may occur when drilling with high-density drilling fluid. Severe lost circulation will lead to a sudden drop of bottom hole pressure, and the gypsum-salt rock will creep rapidly, causing the borehole diameter to shrink, bringing the risk of sticking. The problem of gypsum-salt rock sidewall creep and shrink diameter can be solved by adjusting the concentration of chloride ion to control the dissolution rate of gypsum-salt rock when drilling with undersaturated brine drilling fluid so that the gypsum-salt rock sidewall can be supported effectively with low drilling fluid density [8-10]. In this study, the gypsum-salt rock creep experiments were carried out, and the steady-state creep rate of the gypsum-salt rock was calculated by using Heard creep model. The gypsum-salt rock dissolution experiments were carried out, and the linear dissolution rate of gypsum-salt rock was obtained by using the quadratic polynomial fitting method. The relationship between the density and chloride ion concentration of undersaturated brine drilling fluid was deduced according to the steady-state creep rate and linear dissolution rate.
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Mavukwana, Athi-Enkosi, Kiran Raj Goud Burra, Baraka Celestin Sempuga, and Ashwani Gupta. "Co-Gasification of Gypsum and Municipal Solid Waste Components in CO2 Atmosphere." In ASME Power Applied R&D 2023. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/power2023-108770.

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Abstract In the United States, only 12% of the 284 million tons of municipal solid waste (MSW) generated per annum is currently processed for energy recovery. The limitations to processing more MSW for energy recovery include concern of pollutants emission from the current facilities, high investment cost, low product and economic value and thus economic competition with landfilling. The landfilling is not sustainable so that a permanent solution is urgently required. In this paper, we examine the synergistic potential of incorporating gypsum wastes from construction and demolition sector into the CO2 assisted gasification of municipal solid waste. The effect of varying proportions of gypsum during the co-gasification of gypsum with MSW mixture and individual components (wood and polyethylene terephthalate (PET)) using CO2 as the gasification agent was investigated. The results showed that an increase in gypsum proportion in MSW affected the syngas yield. The yield was reduced by 35% when gypsum was added at equal mass proportions (1:1) to MSW. Adding gypsum to wood increased the cumulative yield of syngas by 7%, and the optimum syngas yield was achieved at a 5:1 ratio of wood to gypsum. The yield of syngas also reduced with an increase of gypsum addition to PET. However, the syngas quality was improved with gypsum addition as the yields of hydrocarbon were reduced. Gypsum increased the syngas yield by 25% more for wood than that of MSW and 60% more than PET. This suggests that the feedstock components with a charring tendency to have greater yields of syngas with gypsum addition. This is attributed to gypsum reaction with char intermediates in a solid-solid reaction along with the reaction of CO2 + C = CO to produce CO that has a significant impact on the syngas yield compared to the oxidation of volatiles by gypsum.
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Yakovlev, Grigory, Anastasiya Gordina, Vladimir Khritankov, Vadim Khozin, Arina Shaybadullina, Damir Khazeev, Irina Bazhenova, Anna Ivakina, Zarina Saidova, and Alexander Repin. "Gypsum composition with siltstone-based mineral modifier." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.041.

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The paper presents the results of studies of the structure and properties of the gypsum composition comprising 3% of crushed siltstone, a metamorphic rock. The structure and physicochemical properties of siltstone were studied, which predetermine its usage as a structuring additive in gypsum compositions. Adding crushed siltstone to the composition of a gypsum binder is shown to cause the compaction of the structure of the gypsum matrix due to changes in the morphology of crystalline hydrates of calcium sulfate and monolithic structure in general, and, consequently, the enhanced mechanical characteristics of the gypsum composition. Using scanning electron microscopy, differential thermography, and IR spectral analysis explain the change in the physicomechanical properties of the gypsum binder.
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Petropavlovskaya, Victoria, Maria Zavadko, Tatiana Novichenkova, Mikhail Sulman, and Kirill Petropavlovskii. "SYNTHESIS OF ENERGY- AND RESOURCE-SAVING GYPSUM COMPOSITIONS AS THE BASIS OF BUILDING MATERIALS AND PRODUCTS." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/4.1/s18.30.

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Improving the performance of the gypsum binder is possible by strengthening the gypsum matrix. The increase in strength is ensured by the introduction of a complex of mineral and chemical additives. The use of waste as components of such a complex solves a set of problems. The market is saturated with competitive and high-quality materials. Designed materials meet modern requirements. In addition, the problems of waste disposal, freeing up space, environmental protection and reducing the resource intensity of production are being solved. The purpose of the work is to obtain energy- and resource-saving compositions of gypsum dry building mixtures with improved physical and mechanical characteristics through the use of modifiers from the resources of the local raw material base. The addition of basalt waste and hydro-removal ash to the gypsum binder as part of a complex of mineral and chemical additives ensures the formation of a hardened modified gypsum stone. During the research, regularities were established for the influence of the components of the additive complex on the properties of the gypsum binder. Optimal ratios between gypsum binder and modifiers have been selected. The microstructure of the modified gypsum stone has been studied. The positive effect of the complex on the structure of gypsum has been proven.
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Pop, Petru A., Patricia A. Ungur, Liviu Lazar, and Florin M. Marcu. "Practical Methods Used for Determination of Elastic Characteristics of Gypsum Materials." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34167.

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The paper is presented a dynamic installation used for determination the elastic characteristics of gypsum materials, such as elasticity modulus-E, rigidity modulus-G, etc. This dynamic installation is composed from: mechanical device for application of axial force, cylindrical gypsum samples on which are fixed 2 strain gages, 2 bridges circuit type “Switch & Balance Unite SB-10 with digital Strain Indicator-P3500, A/D board and PC. As the samples are used two cylinders with differently gypsum compositions: gypsum of dressing and light orthopedic corsets, and from gypsum with sonic absorbent and thermal isolator properties. The acquisition and the interpretation of data with MATLAB program is realized, by used two original programs: “Daquest-2m” for acquisition data, and “Evaluation-1m” for calculation and plot diagram of shock wave time. By determination of shock propagation time passing through the gypsum sample can be calculated the wave velocity and the elasticity modulus of gypsum tested. For building materials on base of gypsum with special applications in medicine, and panels with sonic absorbent and thermal isolator properties are demand to determine the elastic characteristics to enhance the manufacturing process and usefully.
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Халиков, Рауф Музагитович, and Закира Бадретдиновна Латыпова. "INNOVATIVE TECHNOLOGIES IN THE REGIONAL PRODUCTION OF GYPSUM BUILDING COMPOSITES." In Высокие технологии и инновации в науке: сборник избранных статей Международной научной конференции (Санкт-Петербург, Июль 2022). Crossref, 2022. http://dx.doi.org/10.37539/vt198.2022.77.71.013.

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Сырьевая база региональной стройиндустрии гипсовых композиционных материалов Башкортостана включает достаточно крупные месторождения гипсового камня и ангидрита. Инновационная рекультивационная технология добычи гипса является природосберегающим способом восстановления эродированных ландшафтов в результате карьерных разработок гипсосодержащего сырья. В Башкортостане рентабельно выпускаются композиционные строительные материалы и востребованные изделия на основе гипсовых вяжущих. The raw material base of the regional building industry of gypsum composite materials of Bashkortostan includes quite large deposits of gypsum stone and anhydrite. Innovative recultivation technology of gypsum mining is a nature-saving way to restore eroded landscapes as a result of quarrying gypsum-containing raw materials. Composite building materials and demand products based on gypsum binders are produced cost-effectively in Bashkortostan.
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Reports on the topic "Gypsum"

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Collings, R. K., and P. R. A. Andrews. Gypsum and anhydrite. Natural Resources Canada/CMSS/Information Management, 1989. http://dx.doi.org/10.4095/328627.

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Silberstein, Samuel. A gypsum wallboard formaldehyde sorption model. Gaithersburg, MD: National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.89-4028.

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Jessica Marshall Sanderson. Fate of Mercury in Synthetic Gypsum Used for Wallboard Production. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/908234.

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Christopher Hendrickson, Christopher Hendrickson. Genetics of gypsum-endemism and drought tolerance in Sporobolus grass. Experiment, May 2016. http://dx.doi.org/10.18258/7085.

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Lew, H. S. Gypsum stairwell enclosure wall system tests under uniform static pressure. Gaithersburg, MD: National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.ir.7615.

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Hensman, Carl, E., P.h.D and Trevor Baker. Separation of Mercury from Flue Gas Desulfurization Scrubber Produced Gypsum. Office of Scientific and Technical Information (OSTI), June 2008. http://dx.doi.org/10.2172/929776.

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Jessica Sanderson. Fate of Mercury in Synthetic Gypsum Used for Wallboard Production. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/943310.

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Bédard, J. H., V. Troll, and F. Deegan. HALIP intrusions, contact metamorphism, and incipient diapirism of gypsum-carbonate sequences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/297490.

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Bédard, J. H., V. Troll, and F. Deegan. HALIP intrusions, contact metamorphism, and incipient diapirism of gypsum-carbonate sequences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/297783.

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Kukuck, S. Heat and mass transfer through gypsum partitions subjected to fire exposures. Gaithersburg, MD: National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.ir.7461.

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