Gypsum is produced by the desulfurization process, and mainly composed of calcium sulfate dihydrate and some impurities (Fu et al., 2019). As of 2016, China's desulfurized gypsum inventory reached 550 million tons (Wu et al., 2019). Coal gangue is a kind of solid waste discharged in the process of coal mining and coal washing.
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The effects of desulfurized gypsum on the mechanical properties of dredged clay with high initial water content stabilized by ternary geopolymer. Author links open overlay panel Jianhua Wang a b, ... (DC) are produced annually, accounting for over 35% of the global production [1], [2]. Due to the hydraulic method used in the dredging activities ...
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Flue gas desulfurization gypsum (FGDG) is an industrial byproduct produced by limestone-gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal-fired plants, whose main component is CaSO 4 ·2H 2 O. In wet desulfurization, 1 t of SO 2 produces about 2.7 t of FGDG [1], [2]. Some 130 million tons of FGDG were produced in 2019, …
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Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. Due to its abundance, chemical and …
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From the experiment, it was found that the highest compressive strength of concrete brick specimens was 45.18 MPa, which was produced from 5.5% gypsum without CDW and OPT, while 26.84 MPa was the ...
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The synergistic effect of red mud – desulfurized gypsum - fly ash was found. ... and a large amount of ettringite will be produced in the later stage of hydration reaction, which will cause the cement matrix to expand and crack. For FA, high-quality FA is currently widely used in cement. However, for low-quality FA, ...
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The utilization rate of gypsum in sintering was calculated, and the results showed that gypsum decomposition was the limiting factor in the reaction mechanism of calcium ferrite synthesis, the optimal raw material ratio for the formation of calcium ferrite was 30.4% desulfurization gypsum produced in sintering, 31.7% iron ore, 11.1% blast ...
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The desulfurized gypsum powder also contains silica, sodium oxide, calcium carbonate, calcium sulfite, limestone, calcium chloride, magnesium chloride, etc. Compared with other gypsum powder, desulfurized gypsum powder has the characteristics of renewable, small particle size, stable composition, low content of harmful impurities, and high purity.
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China Desulfurized Gypsum wholesale - Select 2025 high quality Desulfurized Gypsum products in best price from certified Chinese Gypsum manufacturers, Gypsum Board suppliers, wholesalers and factory on Made-in-China
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Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material from the power plant.
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Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO2 gas and lime …
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Nevertheless, recent investigations showed an increase in the water resistance of gypsum blocks made by FGDG using granulated blast furnace slag (Zhao et al., 2012), ... growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma, 187–188 (2012), pp. 24-30. View PDF View article View in Scopus Google ...
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processes such as the wet and dry ones that waste, namely desulfurized ash, is always produced and becomes the greatest concern. In 2010, about 10 million tons of desulfurized ash was produced, making it the third largest solid waste in China, only after fly ash and desulfurized gypsum [10–12]. The annual production of desulfurized ash from ...
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Flue gas desulfurization gypsum (FGDG) is an industrial byproduct produced by limestone-gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal-fired plants, whose main component is CaSO 4 ·2H 2 O. In wet desulfurization, 1 t of SO 2 produces about 2.7 t of FGDG [1], [2].Some 130 million tons of FGDG were produced in 2019, …
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Flue gas desulfurized (FGD) gypsum is an industrial by-product produced during the combustion process of wet desulfurization, which mainly originates from thermal power plants, smelters, and large enterprise boilers [1].According to statistics, the annual production capacity of FGD gypsum in China exceeds 70 million tons, which is the largest industrial by-product gypsum in terms of …
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A method for co-producing sulphoaluminate cement and sulfur by using desulfurized gypsum and aluminum ash, comprising: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing the aluminum ash with the semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized …
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Therefore, although the silty mudstone below the depth of the prefabricated cracks also produced a large number of cracks, the slope did not further break and collapse. ... "Development and Application of Flue Gas Desulfurized Gypsum and Blast-Furnace-Slag-Based Grouting Material for Cracked Silty Mudstone" Materials 17, no. 23: 5975. https ...
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As an industrial by-product, flue gas desulfurized gypsum (FGD) is produced from flue gases through the flue gas desulfurization system [24]. Researches have reported the successful application of FGD in soil solidification, generally with the FGD content being 16–18 % [36], [37]. FGD can provide a sulfate environment to stimulate the ...
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In 2010, about 10 million tons of desulfurized ash was produced, making it the third largest solid waste in China, only after fly ash and desulfurized gypsum [10], [11], [12]. The annual production of desulfurized ash from newly added by-products in China is approximately 15 million tons, and it will accumulatively reach several billion tons by ...
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of Bayer RM in cementitious materials. Considering this, desulfurized gypsum (DG) was selected as a sulfate activator in this paper. Desulfurized gypsum is an industrial byproduct produced by thermal power plants (Han et al., 2016). It is acidic and can pollute the soil and water (Panda et al., 2017), and its main component is gypsum dihydrate ...
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In this sense, silage (SG) and flue gas desulfurized gypsum (FGDG) are two good choices as composting additives. SG is made from the roughage obtained by cutting corn, sorghum, and other forage crops and grass; the roughage is then subjected to anaerobic fermentation by lactic acid bacteria, which results in the generation of SG [19] .
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Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with 3% and 4% …
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As an industrial by-product, flue gas desulfurized gypsum (FGD) is produced from flue gases through the flue gas desulfurization system [24]. Researches have reported the successful application of FGD in soil solidification, generally …
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In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), …
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The main component of desulfurization gypsum produced by this process is CaSO 4 ·2H 2 O (Long et al., 2017). The main reactions in the gas-to-liquid contact zone are as following (Córdoba, 2015). ... (AR) close to 1 from flue gas desulfurized (FGD) gypsum. However, the effect of dicarboxylic acid modifiers in the preparation of α-HH by FGD ...
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The semi-hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board, wallboard [107].The modified treatment of desulfurized gypsum with cement, inorganic waste, straw fiber and other wastes can be used to manufacture high-insulation and compression-resistant wall materials [108].Desulfurized gypsum is incorporated into the …
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Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or ...
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The produced water quenching slag and desulfurized gypsum slag are sold to cement plants. In the engineering smelting flue gas, the concentration of SO 2 is about 2000 ~ 3000 mg·m −3, the temperature of flue gas is about 90 ℃, and the solid–liquid ratio of carbide slag slurry is 1:10.
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Performance regulation of desulfurized gypsum on solid waste-based road base materials: Hydration characteristics and environmental performance. Author links open overlay panel Pengfei Wu a b, ... RM, FA, BFS, and DG are industrial waste materials produced during various industrial processes, containing heavy metals and harmful elements [17 ...
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Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest beneficial utilizations of FGD gypsum.
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The semi-hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board, wallboard [107]. The modified treatment of desulfurized gypsum with cement, inorganic waste, straw fiber and other wastes can be used to manufacture high-insulation and compression-resistant wall materials [108] .
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The ultra-high addition of 20 % desulfurized gypsum is beneficial to improve the strength of DG-based binary cementitious materials with low energy consumption. ... Furthermore, the gel products produced by GGBS and DG fails to remove the excess water molecules in the pores, So the binary cementitious material has more water molecules and ...
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China Desulfurized Gypsum wholesale - Select 2024 high quality Desulfurized Gypsum products in best price from certified Chinese Gypsum manufacturers, Gypsum Board suppliers, wholesalers and factory on Made-in-China, page 2
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Desulfurization gypsum is an industrial by-product, with gypsum dihydrate (CaSO 4 ·2H 2 O) as a main component, produced by the use of limestone-gypsum wet desulfurization of coal-fired flue gas. During wet desulfurization, ... The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at ...
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For example, Duan et al. [7] used FA, steel slag, and desulfurized gypsum to prepare cementitious composite materials; they found that the three ingredients had a synergistic effect. Tan and Pu ... The dry-mix mortar product was produced on a demonstration production line; it fully meets the quality requirements of the Chinese standard GB/T ...
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Sintering process made red mud and desulfurized gypsum whiskers adhere evenly and closely, inducing the spilling out of crystal water to form porous structures favorable for the adsorption of Pb(II). The adsorption performance of Pb(II) onto red mud-based ceramsites followed the second order kinetics model and the isothermal adsorption curve ...
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Gypsum produced by flue-gas desulfurization (FGD gypsum) from the Mae Moh power plant, Thailand, was precleaned, characterized and used as the starting material for the preparations of β-hemihydrate (β-HH) and multiphase plasters with compositions within the three-phase composition diagram of calcined gypsum [1]. Based on performance requirements of …
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Flue gas desulfurization gypsum is produced from the capture of SO 2 in the flue gas of fossil fuel combustion using Ca-based absorbents. 1–3 ... Tan et al. studied the process parameters of direct wet mineralization of CO 2 with desulfurized gypsum and established a reaction model of direct wet mineralization of CO 2 with desulfurized gypsum ...
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Flue Gas Desulphurized Gypsum (FGDG) is a by-product generated by the thermal power industry to remove sulfur dioxide (SO 2) from flue gas emissions. This paper …
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Flue gas desulfurized gypsum (FGDG) is an industrial by-product discharged from thermal power plants, smelters, and large-scale enterprise boilers. It is produced when sulfur is removed from flues gases in the flue gas desulfurization (FDG) system, and the formation processes are shown by the following equations ( Liu et al., 2021 ).
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