##tihuan2##Abstract. Flue gas desulfurization gypsum (FGDG) is an effective soil amendment. However, some heavy metals present in FGDG may enter soil or …
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##tihuan2##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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##tihuan2##Like natural gypsum, the application of flue gas desulfurization gypsum (FGDG) with irrigation provides economic and environmental value (Wang and Yang, 2018; Watts and Dick, 2014). FGDG is of low cost, because it is a side product of sulfur removal from fuel combustion in coal-fired power plants and does not require mining and …
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##tihuan2##The soil nutrient content of the ameliorated saline-alkali soils with different ages,and the diurnal courses curve of photosynthetic parameters,photosynthetic light response curve and yield of oil-sunflower(Helianthus annuus) grown on the ameliorated soils were measured to investigate the effects of desulfurated waste residue additions on the saline-alkali …
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##tihuan2##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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##tihuan2##This research aims to study the utilization of waste from power plants, construction and demolition, and agriculture by varying the ratios of flue-gas desulfurization (FGD) gypsum, construction and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used these as the raw materials for the production of …
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##tihuan2##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 …
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##tihuan2##High value-added utilization of desulfurized building ... is unclear. In summary, desulfurized gypsum, an industrial by-product produced by ue gas desulfurization process, is the most practical engineering value raw material for preparing GSL. ... The β -hemihydrate gypsum had a rhombus crystal morphology based on SEM image (Fig. 3). …
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##tihuan2##The soil in the study area is takyric solonetz, which is characterized by a hard white surface, high salinity and pH, poor soil structure, and low fertility. The exchangeable sodium saturation percentage (ESP) of the takyric solonetz is as high as 42.1%, and the pH value may be as high as 9.0–10.5 . The sediment consists of the …
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##tihuan2##This work was expected to provide reference for promoting the application of desulfurized building gypsum as the high value-added screed. Chemical compositions of raw materials (wt.%). Mix ...
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##tihuan2##The massive deposition of sediment in the Yellow River leads to the waste of land resources and is also prone to environmental disasters. In this study, the industrial by-product, flue gas desulfurization gypsum (FGDG), was incorporated with Portland cement (PC) and fly ash (FA) to treat the dredged soil (DS) from the Yellow River. The …
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##tihuan2##SEM results showed that CSH gels and AFt crystals were formed on the surface of gypsum crystal after hydration for 28 days, thus reducing the dissolution of …
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##tihuan2##Calcium sulfate whiskers (CSWs) were synthesized using purified flue-gas desulfurization (FGD) gypsum as raw materials using a hydrothermal method, where the filtrate was recycled back to the reaction slurry. The study investigated the impact of pH and Cu2+ concentration in the reaction solution with or without reagent compensation. The …
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##tihuan2##The FGD gypsum samples had an average pH value of 8.73 and EC 4.87 dS m −1. The calcium carbonate percentage ranged from 15 to 17% for different FGD gypsum samples with a moisture content...
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##tihuan2##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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##tihuan2##In this work, we studied the phase- and morphology-controlled crystallization of gypsum by using flue-gas-desulfurization (FGD) gypsum source materials in HCl–H …
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##tihuan2##The release of the heavy metals was measured after the cured gypsum samples were placed in different pH and water-content environments for different times to investigate the effects of different pH values (pH values of 6, 8, 10, and 12; the pH was adjusted using a NaOH solution and a HNO 3 solution), water contents (0%, 5%, and …
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##tihuan2##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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##tihuan2##To investigate the macroscopic mechanical properties and failure evolution mechanism of desulfurization gypsum–fly ash fluid lightweight soil, a microscale numerical model using PFC2D (Particle Flow Code) was constructed. Uniaxial compression tests were conducted to determine the microscopic parameters of the model, extracting information …
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##tihuan2##The paper discusses the chemical and physical properties of FGD gypsum, including its composition, crystal structure, particle size, and moisture content. It also reviews the various applications of FGD gypsum, such as in cement and concrete …
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##tihuan2##In order to realize the resourceful, large-scale, and high-value utilization of steel slag, which is a bulk industrial solid waste, and to reduce the use of cement-based cementitious materials, this study adopted the coupled excitation effect of sodium carbonate–magnesium oxide–desulfurization gypsum to excite steel slag-based …
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##tihuan2##The difference of ettringite morphology is mainly related to the gypsum content and pH value of SDS samples (Zhang et al., 2018). According to Fig. 14 (c) and (d), it can be seen respectively that the amount of ettringite and C–S–H in samples W30A15 and W30C15 increased significantly after 10 cycles of drying-wetting, and the distribution ...
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##tihuan2##The production of flue gas desulfurization gypsum poses a serious threat to the environment. Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out as a promising and effective approach to address the issue. β-hemihydrate gypsum, cement, polycarboxylate superplasticizer, hydroxypropyl methyl cellulose ether (HPMC), retarder, …
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##tihuan2##A sustained pH > 7 in surface runoff and a pH > 5 in tile flow drainage were observed in FGDG-added mine sites. The authors confirmed the presence of RCRA …
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##tihuan2##In this introduction, we'll explore the definition and composition of gypsum. Gips – Lubin, Poland Original image of the Gypsum crystal. You can see luminescence of the crystal in the next photo. Gypsum, Red River Floodway, Winnipeg, Manitoba, Canada. Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate (CaSO4·2H2O).
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##tihuan2##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 …
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##tihuan2##The application of flue gas desulfurization gypsum (FGDG) improves the soil structure, reduces soil pH, and accelerates soil salt leaching. Biochar amendment to soil can affect the soil ...
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##tihuan2##The incorporation of desulfurized gypsum, fly ash, and hydrated lime within raw soil materials significantly enhances compressive strength and water resistance. …
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##tihuan2##This study aims to investigate the subsurface gravel ditches and desulfurization gypsum (DG) as amelioration methods for alkalized solonchak soils in Gansu Jingyuan of China (37°02' N, 104°96' E).
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