1. Calcination process of desulfurized gypsum (1) Low temperature and slow calcination. Low-temperature slow-speed calcination means that the material stays in the calcination equipment for a long time, and the feeding and discharging time is at least …
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The above research shows that the application of desulfurized gypsum in concrete systems will help improve the overall performance of concrete, realize the industrial utilization of desulfurized gypsum, and turn desulfurized gypsum into treasure, which is in line with the green and low-carbon development concept. However, adding …
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1. Introduction. Saline-sodic soils (i.e., electrical conductivity (EC) > 4 dS m −1 or pH > 8.5) cover ∼10% of the global land surface and deliver various ecosystem services for at least 75 countries (Szabolcs, 1994; U.S. Salinity Laboratory Staff, 1954).However, the quality of saline-sodic soils is low due to poor soil structure and low …
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DOI: 10.1016/j.conbuildmat.2023.130361 Corpus ID: 255909899; Influence of calcination temperature on hydration behavior, strength, and weathering resistance of traditional gypsum plaster
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In order to protect national grain safety and ecological safety and develop a sustainable economy,it is important to improve alkaline land with desulfurized gypsum from coal fired power plants.Representative lightly alkalized soil,medium-alkalized soil and seriously alkalized soil in Xidatan of Ningxia Province were selected in the research and used in …
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The calcination temperature of kaolinitic clays was investigated to optimize the reactivity of calcined clay. Batches of a clay with 50% kaolinite were calcined in an oven at five different calcination temperatures from 600 to 850°C. ... An example is shown in Figure 8, where different gypsum additions (in addition to the amount in the cement ...
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The hammer mill, being a short-time calcining system, grinds, dries, calcines and classifies the raw gypsum in a single step. The resulting stucco is suitable for the production of plasterboard, gypsum fiberboard and gypsum wall blocks. A hammer mill can process moist FGD gypsum, pre-crushed natural gypsum, or a mixture of both.
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DOI: 10.1016/j.conbuildmat.2023.133302 Corpus ID: 261794915; Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure
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The calcination-treated FGD gypsum would not influence the type and morphology hydration products of the calcium sulfur aluminate cement-fly ash-FGD gypsum system, and the calcination of FGD gypsum is able to promote the hydration degree of fly ash especially in the presence of lime, making the hardened slurry more …
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The calcination of FGD gypsum is used as a phosphate adsorption material to treat phosphate wastewater. Roasting improves the adsorption performance of FGD …
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To determine which factor, the calcination temperature of FGD gypsum (500–800 °C), the hydration time (3–28 days) or the amount (0–2%) of the activators K2SO4 and Na2SO4, has the greatest ...
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DOI: 10.1016/j.jobe.2021.103511 Corpus ID: 239896906; Recycling of phosphogypsum to prepare gypsum plaster: Effect of calcination temperature @article{Cao2021RecyclingOP, title={Recycling of phosphogypsum to prepare gypsum plaster: Effect of calcination temperature}, author={Wenxiang Cao and Weili Yi and Jia …
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To determine which factor, the calcination temperature of FGD gypsum (500–800 °C), the hydration time (3–28 days) or the amount (0–2%) of the activators …
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The 11 major electricity-generating coal combustion stations in the northern Great Plains have the potential to produce almost 1 million Mg of flue gas desulfurization gypsum (FGDG) annually, which is a very …
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Erbs et al., studied the influence of different re-calcination temperatures (160 °C, 180 °C, and 200 °C) and for different time periods (1, 2, 4, 8, and 24 h) on the mechanical properties of recycled waste gypsum boards [157]. The highest compressive strength was observed for gypsum waste treated at 180 °C for 24 h.
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The prevalence of gypsum wallboard in fire scenes makes it a potentially valuable source of information to fire investigators when assessing a fire scene. The exposure of gypsum wallboard to heat from a fire can result in calcination, which in turn can theoretically be correlated to the total heat exposure to that area. ... develop an objective ...
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Desulfurized gypsum contains partially unreacted CaCO 3 and partially soluble salts, such as potassium salts and sodium salts. The presence of these impurities promotes the hydration process of cement. Meanwhile, these impurities can also stimulate the activity of the mixed materials, which is conducive to the development of cement strength in ...
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[21] Tobert HA and Watt DB 2014 Impact of flue gas desulfurization gypsum application on water quality in a coastal plain soil J Environ Qual 43 273-280. Google Scholar [22] Tong ZJ, Li QS and Zhou YS 2009 Effects of desulfurized gypsum on heavy metal desorption and speciations in tidal flat reclaimed soil Eco and Environ Sci 18 2172 …
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At the same calcination temperature, the resistivity of the anode increases with the increase of the mixing ratio of calcined coke . ... How to use high temperature desulfurized coke in large quantities and avoid adverse effects on product property is an important subject in the future research of high sulfur petroleum cokes. Reference ...
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DOI: 10.1016/j.conbuildmat.2024.137061 Corpus ID: 270530557; Properties and microstructure of soil solidified by titanium slag-flue gas desulfurized gypsum-Portland cement composites as solidifiers
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The calcination temperature rises to 180 °C, 2 h flexural and compressive strength are respectively up to 2.6 and 4.3 MPa, conforming to the grade 2.0 …
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The FGD gypsum was firstly calcined in the DRY-36 high-temperature industrial furnace at 800 C for 1 h, and then cooled to room temperature within the …
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Calcination of bauxite and gypsum involving the removal of water of crystallisation in the form of water vapour. Decomposition of volatile components from raw petroleum coke. ... Initially, the gypsum is …
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Calcination of Gypsum was an accidental discovery as were its rehydration characteristics. Ancient man probably used lumps of Gypsum to enclose his fire. Some degree of calcination and softening occurred and when the fire was extinguished with water he noticed the lumps soon hardened. ... The boiling temperature of 250°-260°F …
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DOI: 10.1016/j.conbuildmat.2023.131840 Corpus ID: 258997305; Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials @article{Lv2023EffectsOH, title={Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials}, author={Fangtao Lv …
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The low-temperature calcination method (equipment) is to indirectly heat the desulfurization gypsum through the built-in heating pipe. The heat source adopts steam and heat transfer oil.
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DOI: 10.1016/j.jobe.2022.105368 Corpus ID: 252750931; Effect of curing temperature on the reaction kinetics of cementitious steel slag-fly ash-desulfurized gypsum composites system
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3.1 Effect of different temperatures on chlorides in FGD gypsum. The heat loss test results of the FGD gypsum inorganic chlorides are shown in Figure 3. For temperatures ranging from 30 to 90°C, none of the chlorides were decomposed in large amounts. ... According to the ACAA (American Coal Ash Association), 1 chloride content …
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The highest compressive strength was observed for gypsum waste treated at 180 °C for 24 h. Likewise, Rossetto et al., studied the mechanical strength and …
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