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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The grouting technique is an efficient method for enhancing the stability of cracked slopes through the use of grouting materials. Conventional cement-based grouting materials are costly, energy-intensive, and environmentally damaging. Additionally, cement-hardening slurry is prone to cracks between the slurry and the rock. To address these issues, this study proposed …
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The invention relates to the technical field of packaging, in particular to a finished product storage and packaging mechanism for producing desulfurized gypsum powder, which comprises support frames, a fixing frame, a limiting rod, a limiting component and a sawtooth rod, wherein the upper ends of the two support frames are fixedly provided with the support frames, a discharge hole …
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The utility model relates to the technical field of limestone-gypsum wet flue gas desulfurization, in particular to a large-capacity desulfurized gypsum storage system, which comprises a …
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FGD-gypsum and cover crop effects on soil physical properties. Bulk density (ρb), as a measure of soil compaction, was significantly affected by FGD-gypsum and cover crop managements (Table 7). FGD-gypsum amendments marginally decreased ρb, while the cover crop significantly decreased the ρb by more than 4% compared to the control.
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The results of the chemical analysis of gypsum plaster are shown in Table S1 in supporting information which shows that all properties of gypsum plaster comply with the requirements of IS: 2547 ...
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The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and dehydrated for 2 h under synchronous heating with the box. The microscopic morphology of desulfurization gypsum from SEM and XRD analysis is shown in Fig. 1. The original desulfurization gypsum featured rhombic blocks ...
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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 environmental performance were …
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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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hydrate gypsum and desulfurized ash are given in Fig. 1 A. The specific surface areas of desulfurized ash and hemihydrate gypsum are 351 and 328m2/Kg respectively. And the XRD patterns of desulfurized ash and α- hemihydrate gypsum are shown in Fig. 1B. 2.2. Sample preparation All the specimens were kept as the constant value of 180mm as the
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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. ... Currently, for FGDG to be incorporated in …
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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 physical properties, FGDG has been used in several beneficial applications. However, during the past decade, the rate of beneficially used FGDG has gradually …
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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 Chinese ...
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The particle size of the desulfurized gypsum is relatively uniform, the distribution band is narrow, particles are mainly concentrated between 20-60 μm. Grain grading is far worse than gypsum powder when natural gypsum is grinded. …
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Desulfurized gypsum, a by-product of thermal power plants for removal of sulfur from coal, may be used as an external source of Ca2 + for reclamation of saline-sodic soil in this plain because it ...
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1. Introduction. In recent years, the global production of flue gas desulfurization gypsum (FGDG) has surged, with annual emissions exceeding 255 million tons [].Currently, with the continuous increase in energy consumption and increasingly stringent environmental requirements, the production of FGDG in China has exceeded 100 million tons [].The …
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Study on desulfurized gypsum used as cement retarder Jianmei Zhou* School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou 014010, China ... final setting time can meet the use requirements of Portland cement, so it is feasible to use desulfurized gypsum as cement retarder. At the ...
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1. Introduction. BPG is an industrial solid waste primarily composed of calcium sulfate. Its main components include desulfurized gypsum (DG), phosphogypsum (PG), and titanium gypsum (TG), with smaller amounts of fluorogypsum, salt gypsum, and others [1,2,3].Figure 1 shows the distribution proportions of BPG sources in China. BPG contains various impurities and harmful …
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Fly ash (FA), carbide slag (CS) and flue-gas-desulfurization gypsum (FGDG) are three solid wastes industrially produced in large quantities. The accumulation of these solid wastes seriously threatens human health and the environment [1, 2].If not addressed in time, it can cause irreparable damage to the ecological balance [[3], [4], [5]].It has been reported that …
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According to the ACAA (American Coal Ash Association), 1 chloride content in the desulfurized gypsum should be reduced to below 400 ppm. ... The saturated steam spray process meets the dechlorination requirements …
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A commercial gypsum (COMg) from the company AFIMOSA S.L. was also employed, in accordance with EN 13279-1 (CEN, 2009) standard . Table 1 shows the chemical composition of FGD-gypsum and COMg and, as can be seen, the FGD-gypsum presents a high humidity. The reason for this is that the FGD-gypsum provided comes from a wet …
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The technology is to grind lime-limestone into powder through a desulfurized gypsum mill, and then configure it into a slurry, so that the SO2-containing flue gas after dust removal is passed through a slurry scrubber to remove SO2. ... The crushed small pieces of material are sent to the storage hopper through the elevator,and then sent to the ...
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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 Chinese government has …
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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 utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. The objective of this study was to improve. comprehensive properties of GSL and prepare qualied desulfurized building gypsum-based self-leveling
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It was found that when red mud, fly ash, and desulfurized gypsum are used to prepare road base materials, in the case of (CaO + Na 2 O)/(SiO 2 + Al 2 O 3 ) = 0.88, the UCS of road base materials ...
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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. ... but also decline the solid waste of sulphate stored on the ground, which is in line with the requirements of low-carbon green sustainable development, the implementation of the idea ...
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The addition of desulfurized gypsum was found to increase the mixing water demand and prolong the setting time, while reducing the strength. The resulting product still met building requirements. Yang et al. studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG can improve the ...
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This would allow FGDG present in landfills and temporary storage locations to be perceived as a valuable source for gypsum for these newly identified applications. ... it must fulfill these basic requirements: 1) ... growth and yield using desulfurized gypsum in the west of …
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The influence of different amounts of gypsum on the hydration of a belite-rich and a ye'elimite-rich belite-calcium sulfoaluminate clinker (BCSA) was investigated.
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The results of the chemical analysis of gypsum plaster are shown in Table S1 in supporting information which shows that all properties of gypsum plaster comply with the …
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In the gypsum-metakaolin-cement system, although the dried FGD gypsum slightly reduced the workability of the mortar, the interval between the initial setting and the final setting was shortened ...
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The desulfurized gypsum also dissolved SO 4 2 ... This could be due to the relatively high water requirement of calcined FGD gypsum and the addition of calcium aluminate. After steam and standard curing, the development of compressive strength in relation to the age and sulfate content is shown in Figure 4. The addition of the sulfate and ...
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A technology of desulfurization gypsum and phase change energy storage, which can be applied in the direction of sustainable waste treatment, solid waste management, climate …
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