Comparative effect of additives on the mechanical properties of plasters made from flue-gas desulfurized and natural gypsums Materials and Structures, 2002 Comment on "Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process"
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Mercury is considered a toxic pollutant harmful to our human health and the environment. Mercury is highly persistent, volatile and bioaccumulated and enters into the food chain, destroying our ecosystem. ... Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by ...
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Desulfurized gypsum (DG) presents significant challenges in recycling with the rapid development of industrialization. To explore the feasibility of DG as a sulfate source in producing limestone calcined clay cement (LC3), this study investigates the differences between LC3 samples containing DG and those containing natural gypsum (NG) in terms of hydration, …
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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 reclamation and planting with …
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@article{Wang2023SynergisticEO, title={Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure}, author={Yaguang Wang and Xiaoming Liu and Xiang Zhu and Wenxi Zhu and Jianwei Yue}, journal={Construction and Building Materials}, year={2023}, url={https://api ...
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gypsum, phosphogypsum, and titanium gypsum, whic h account for 88% of the total BPG in China. The large-scale utilization of these three types of solid waste is crucial for the safe disposal of BPG.
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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 2172-2176 in ...
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The Portland cement-fly ash-desulfurized gypsum composite solidifier brings the dredged soil to have higher strength and good resistance to dry-wet cycles ... However, the contents of harmful heavy metal ions in titanium slag are very low, and the leaching risks of heavy metal ions are negligible when applied to soil solidification [34], [35 ...
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Nearly half of American drywall is now made with this synthetic product, known as flue gas desulfurized gypsum or FGD gypsum. Despite its increasing popularity, synthetic gypsum isn't regulated...
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Comparative Analysis of Hydration Expansion Performance of Desulfurized gypsum-baseda/β Gypsum. Jixiu Zhang 1, Ye Zhang 1, Yuanchao Miao 1 and Saihong Duan 1. ... Gypsum has micro-expansion characteristic during the process of hydration and solidification, and there are certain differences in the hydration expansion characteristics of ...
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With the addition of desulfurized gypsum, the overall compressive strength of the ternary system was higher than that of the binary system, because CaSO 4 ·2H 2 O is the main mineral phase in FGDG.SO 4 2− has a sulfate-stimulating effect that improves the gelling activity of FA [7] and generates hydrated aluminosilicate and other gelling ...
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The rapid expansion of coal-fired power plants has led to a significant increase in the production of flue gas desulfurization (FGD) gypsum, a byproduct of sulfur dioxide emission control processes [1], [2].With annual global output reaching millions of tons, FGD gypsum poses substantial environmental challenges due to its large-scale accumulation and potential …
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Although studies have shown that desulfurized gypsum can be used for mine backfilling, the leakage risk of pollutant elements that affects the safety of the groundwater …
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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. ... this combination could be harmful because acrylamides have been deemed as neurotoxins (Lapin et al., 1982, Prasad and Muralidhara, ... growth and yield using desulfurized gypsum in the west of ...
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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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Industrial byproduct gypsum (BPG) is a secondary product that is mainly composed of calcium sulfate discharged during industrial production. BPG primarily consists of desulfurized gypsum, phosphogypsum, and titanium gypsum, which account for 88% of the total BPG in China. The large-scale utilization of these three types of solid waste is crucial for the …
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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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As the waste of coal-fired power plant, desulphurization gypsum is mainly composed of CaSO 3 and CaSO 4, which can replace Na+ in saline-alkali soil to improve saline-alkali soil.In order to study the effect of different dosage of desulfurization gypsum on the improvement of saline-alkali land, field experiments were carried out in Duiziliang Town, …
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Dicarboxylic acid modifiers play a crucial role in the controlled synthesis of α-hemihydrate gypsum (α-HH) with an aspect ratio (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 gypsum and the mechanism of action is unclear.
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In the future, the effects of three-phase composition, particle size of desulfurization building gypsum, and multiple mineral admixtures on the performance of gypsum-based self …
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Abstract. As a relatively fast-setting building material, desulfurized gypsum is difficult to use. Citric acid, sodium gluconate, and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders. The effects of the retarder type and content on the setting inhibition and mechanical properties of desulfurized …
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In the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO 2 removed . A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) . A substantial amount of desulfurized gypsum is … WhatsApp: +86
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Desulfurized ash contains about 21.33% hemihydrate calcium sulfite, 18.11% calcium carbonate, 28.55% dihydrate gypsum, 25.81% calcium hydroxide, 1.85% calcium oxide. Particle size distributions of hemi-hydrate gypsum and desulfurized ash are given in Fig. 1 A. The specific surface areas of desulfurized ash and hemihydrate gypsum are 351 and
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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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The results show that adding desulfurized gypsum, which accounts for 6% to 8% of the total mass of the cementitious material, has no adverse effect on the workability and can significantly improve ...
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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 ...
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SO 2 causes great harm to the environment and humans. Historically, famous smog events such as the Maas Valley smog, London smog, ... Desulfurized gypsum can not only improve saline-alkali soils and increase crop yields; it can also be used as an additive to make cement, concrete, wall materials, etc. The sodium-alkali method is widely used in ...
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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 ...
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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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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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