— Flue gas desulphurisation gypsum (FGDG) mainly refers to the solid by-product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur-containing fuels, such as coal and petroleum [1].In the limestone gypsum flue gas desulphurisation process, 2.7 tons of …
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— Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base ...
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— The use of waste to capture CO 2 has been on the rise, to reduce costs and to improve the environmental footprint. Here, a flue gas desulfurization (FGD) gypsum waste is proposed, which allows us ...
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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 use of FGD gypsum as a soil amendment is well known and has been investigated thoroughly over the past few decades. 6 Recently, studies have mainly focused on amending sodic soils, …
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— The main functions of polymer admixtures are to form a hydrophobic layer between the gypsum crystals, which can improve the mechanical strength and water resistance. ... the impact of flue gas desulfurization (FGD) gypsum's crystal modifier on the characteristics and microcosmic mechanism of α-high strength gypsum. The results …
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— ABSTRACT. Integration of flue gas desulfurized gypsum (FGD-gypsum) with cover crops is expected to improve soil quality (SQ). Our objectives were to evaluate the impact of FGD-gypsum and rye on SQ and the contribution of core indicators to account for SQ variability in a rainfed corn-soybean system.
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— The combination of amendments has emerged as a potential strategy to efficiently alleviate salt stress in saline-alkali soil. However, knowledge regarding how to optimize the proportion of different amendment materials, comprehensively assess the contribution of each component, and clarify the response mechanisms of the …
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— Kost et al. (2014) compared the influence of FGDG and natural gypsum on soil chemistry. After one year at a gypsum rate of 20 Mg ha − 1, soil treated with FGDG had pH levels lower than the untreated soil, and lower than the soils treated with natural gypsum, because natural gypsum has a higher CaCO 3 content, hence a higher ANC. …
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— The amelioration mechanism of FGD gypsum is due to Ca 2+, which reacts with CO 3 2− and HCO 3 − and replaces exchangeable Na + in soil colloids to lower soil pH, thereby improving soil physical and chemical properties (Chen et al., 2011, Tirado-Corbalá et al., 2013, Tirado-Corbalá et al., 2019, Mao et al., 2016).
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— Deterioration of mechanical properties and damage mechanism of flue gas desulfurization gypsum backfill under long-term erosion of chloride salt solution Tianqi Jiang ( ) 0000-0003-3500 …
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— The binders used in the test included Portland blast furnace slag cement (P325) and fly ash (FA). The main composites of both cement and fly ash were CaO, SiO 2, Al 2 O 3 and Fe 2 O 3, as determined by X-ray fluorescence, and are shown in Table 2.Based on ASTM C618 [8], the used fly ash can be classified as F for the total content …
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— Notably, the ratios of FGD gypsum used for wallboard production and land applications increased from 2005 to 2019 due to national policies [60] and the promotion …
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— F lue gas desulfurization gypsum (FGDG) is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite (CaCO 3) to form calcium sulfite (CaSO 3 ·0.5H 2 O), which is further treated with wet limestone and forced oxidization to form calcium sulfate (CaSO 4 ·2H 2 O) (Laperche and Bigham, …
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This paper reviewed desulfurized gypsum physiochemical properties and the mechanism of using desulfurationgypsum to ameliorate saline-sodic soil,summarized the improving effect and environment response and looked forward to theapplication prospect of desulfurized gypsum improve saline-sodic soil.
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— Integration of flue gas desulfurized gypsum (FGD-gypsum) with cover crops is expected to improve soil quality (SQ). Our objectives were to evaluate the impact of FGD-gypsum and rye on SQ and the ...
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— PurposeFor an alkaline–saline region in Northwest China, we examined the responses of soil microbial communities to flue gas desulfurization gypsum by-products (FGDB), a new ameliorant for alkaline–saline soils. In 2009 and 2010, we collected soils from 0–20 cm and 20–40 cm depths along an experimental FGDB gradient (0, 0.74, …
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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., …
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— Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement-fly ash-slag-desulfurized gypsum), is proposed for this soil. The effe …
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— An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas desulfurized gypsum-Portland cement composite (TS-FGD-OPC composite) solidifier on the performance of solidified …
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— F lue gas desulfurization gypsum (FGDG) is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite (CaCO 3) to form calcium sulfite (CaSO 3 ·0.5H 2 …
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— Geopolymer is an emerging green cementitious material that can be used to stabilize dredged clay (DC) as construction materials. This paper presented an experimental study on the effects of desulfurized gypsum (DG) on the mechanical properties (e.g., stress-strain characteristics, unconfined compressive strength (UCS) and water stability) of …
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— Research on the method of improving the influence of chloride ion on the performance of desulfurized gypsum products [J]. New building materials. 2014, 11: 41-45.
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— Flue gas desulfurization (FGD) gypsum and straw return have been recognized for their roles in reducing soil sodicity and improving soil organic matter. However, there are few studies on the effect of their combination on improving and fertilizing sodic soil. FGD gypsum at a rate of 15 t ha−1 and three types of straw (sunflower seed …
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— Semidry desulfurization and wet desulfurization in a furnace are usually used in the circulating fluidized bed boiler in the power production of thermal power plants, and these two approaches lead to high calcium content in the fly ash and bottom slag of circulating fluidized beds and produce abundant flue-gas desulfurized (FGD) gypsum …
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A field experiment was conducted from May 2017 to October 2019 in Wuyuan County, Bayannur City, Inner Mongolia, China (41° 02′ N, 108° 11′ E, 1026 m above sea level). The region has a mid-temperate …
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Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement-fly ash-slag-desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages, age of preservation, …
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maize in spring. Soil pH in all treatments tended to increase as time increased in the 0–20 and 20–40 cm soil layers in the raised bed. The results of the present study suggest that …
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— Using Portland cement for soil solidification has sustainability issues due to high energy-consumption and carbon emissions.An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas …
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— Using desulfurized gypsum and steel slag as raw material make desulfurized gypsum-steel slag composite gelled material, by adding cement, triethanolamine, aluminium sulfate, compound activator ...
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