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Flue gas desulfurization gypsum (FGDG), a solid waste produced during sulfur removal in coal-fired power plants, has applications in saline-alkali soil amelioration due to its …
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1. Introduction. 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 …
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Given the great environmental pressure brought by the massive stacking of solid waste, red mud and desulfurized gypsum were used to prepare cementitious materials.
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Yang et al. studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG can improve the hydration …
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The application of flue gas desulfurization (FGD) gypsum to ameliorate saline-alkaline soils not only provides a new use for FGD gypsum, but also provides a new method for improving saline-alkaline soils. This paper reviews the development of this technology for ameliorating saline-alkaline soils over the past 20 years including the basic theory, key …
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The 11 major electricity-generating coal combustion stations in the northern Great Plains have the potential to produce almost 1 …
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Nine push-out specimens of H-shaped steel with gypsum cover (HSG) are designed to study the bond-slip behavior between steel and gypsum in steel grid frame filling with cast-in-situ gypsum (SGFCG).
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XRD, SEM and elemental characterization of FGD gypsum. X-ray diffraction analysis revealed that the characteristic peaks at 2θ value of 11.8, 20.8 and 23.5 (Fig. 2a) of the FGD gypsum 1 suggested ...
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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 materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3) molar ratio, and its mechanical properties, durability, microstructure and …
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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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The treatment of flue‐gas desulfurization (FGD) gypsum, a common solid waste material that is often affected by chloride ions, typically occupies large amounts of land, causes resource waste ...
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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, …
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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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It was estimated that nearly 19 million people worldwide were at risk of Hg exposure in 2015 [4], demonstrating that Hg pollution is a global public health challenge. …
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This study investigated the effects of combined (mixed) application of desulfurization gypsum and biochar on crop growth and soil properties in the saline-alkali soils of coastal mudflats through indoor pot experiments and eight experimental ameliorant treatments. Among them, CK was the control of newly reclaimed cropland in the study …
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results showed that the application of desulfurization gypsum could reduce the harm of salt and alkali in soil to the germination, emergence and growth of millet seeds. ... T3 and T4 were set up. The dosage of desulfurized gypsum was 0, 10, 20 and 30 t hm-2, respectively. Millet was planted by artificial ditching with a row spacing of 20 cm and ...
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With steel slag and desulfurized gypsum as main raw material,mixed appropriate amount slag and compound addition a little of activator,and based on orthogonal test,we explored the slag dosage,the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker-free cementing material,such as …
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Germany Desulfurized Gypsum Market By Application Construction Agriculture Cement Production Waste Management Others Desulfurized gypsum, a byproduct of flue gas desulfurization in power plants ...
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Gypsum deposits were formed during the Paleozoic Era, approximately 600 million years ago, when most of the Earth's surface was covered by salt water. Gypsum is composed of 79.1% calcium sulfate …
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The desulfurized gypsum treated with hydrogen peroxide can improve the stability of cement. When the proportion of desulfurized gypsum and natural gypsum …
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As we know, coal is the dominant energy in Chinese energy mix. Almost all of the coal-fired power plants are required to equip desulfurization facility to remove SO 2 in the flue gas, as illustrated in Fig. 1.The most popular desulfurization technology is wet-FGD using limestone, with the product called FGD-gypsum, which main content is CaSO 4. ...
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Desulfurized ash from semi-dry flue gas desulfurization and α-hemihydrate gypsum were collected from Baotian New Building Materials Co.,Ltd. Their chemical components are shown in Table 1.Desulfurized ash contains about 21.33% hemihydrate calcium sulfite, 18.11% calcium carbonate, 28.55% dihydrate gypsum, 25.81% calcium …
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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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The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies. Thus, the changes in the levels of soil salinity, alkalinity, crop yield, and other physicochemical properties in different soil types and crops after …
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What is desulfurization gypsum. Desulfurization gypsum, also known as FGD gypsum (flue gas desulfurization gypsum), is an industrial by-product gypsum obtained by …
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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. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the …
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FGD gypsum is a by-product of flue gas desulfurization (FGD) to remove sulfur dioxide emissions from coal-fired power plants. It has various applications in construction, agriculture, and gypsum board manufacturing, but also some drawbacks …
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Thermal Power Plant generates FGD gypsum as by-product during coal combustion. This study evaluates the characterization (spectroscopic and elemental), …
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Gypsum whiskers which are also called calcium sulfate hemihydrate whiskers or Calcium sulfate whiskers, are a type of fiber made from calcium sulfate hemihydrate. These whiskers are characterized by their fibrous structure, which has a length-to-diameter ratio of up to 100:1. They have several desirable qualities, including …
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Two kinds of inorganic reinforcing materials, single Portland cement clinker, compound Portland cement clinker and mineral powder, were used to analyze the effects of desulfurized gypsum on the properties of desulfurized gypsum based cementation material. The results show that either single Portland cement clinker or compound …
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6–79.8% of Hg in FGD gypsum could be reemitted at 100–200 °C.. The Hg release ratio is directly related to the HgClx content in FGD gypsum.. Wallboard production and being used as cement retarder were two main Hg re-emission pathways of FGD gypsum utilization.. The secondary Hg emission from FGD gypsum utilization …
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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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Ignoring emissions of Hg from coal ash and desulfurized gypsum will lead to ineffective mercury control in coal-fired power plants in China Environ Sci Technol . 2012 Mar 20;46(6):3058-9. doi: 10.1021/es300786d.
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The United States Desulfurized Gypsum Market size is reached a valuation of USD xx.x Billion in 2023, with projections to achieve USD xx.x Billion by 2031, demonstrating a compound annual growth ...
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In 2020, global FGD-gypsum production is expected to reach 255 million tons, with Asia accounting for 55%, followed by Europe (22%), North America (18%), and the rest of the world (5%).
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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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