— 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 is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be effectively …
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— According to the U.S. Energy Information Administration's statistics, in the 2006–2016 period, approximately 42% of the electricity consumed in the U.S.A was produced by coal combustion (U.S. Energy Information Administration, 2018).The coal combustion process generates various types of residues such as fly ash, bottom ash, …
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Saline-sodic soil colloids contain a large number of exchangeable sodium ions,leading to soil aggregates breakdown,clay dispersion and soil pores blocking.Saline-sodic soils improvement requires two processes,providing calcium source to exchange with sodium on soil surface and removing salt through leaching or drainage.In this study,we used corn …
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— Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains ...
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— Solid waste-based binders have been widely studied for decades. Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear.
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— Solid waste-based binders have been widely studied for decades. Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear.This paper investigated the reaction kinetics of SS-FA-DG …
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DOI: 10.1016/j.envpol.2021.117799 Corpus ID: 236531280; Production and resource utilization of flue gas desulfurized gypsum in China - A review. @article{Liu2021ProductionAR, title={Production and resource utilization of flue gas desulfurized gypsum in China - A review.}, author={Sen Liu and Wei Liu and Fen Jiao …
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— Gypsum is composed of 79.1% calcium sulfate and 20.9% water (by weight). It is a nonmetallic mineral, one of the most abundant in the world, and is found in rock form. Its chemical formula is CaSO 4 ·2H …
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— 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 …
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— 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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ity standards for recyclable desulfurized gypsum obtained in the WFGD process operated in the Dangjin thermal power plant in the Republic of Korea [14]. 2. Process Modeling Fig. 3 illustrates the WFGD process modeled by Aspen plus. In this model, the reactions occur in the liquid phase. Thus, the ther-
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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. ... 2 School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, …
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DOI: 10.1089/EES.2020.0424 Corpus ID: 234827580; Integrated Assessment of the Environmental and Economic Effects of Resource Utilization Process for Lime/Gypsum Flue Gas Desulfurization Collaborative Desulfurized Gypsum
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— the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [4]. A substantial amount of desulfurized gypsum is …
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— Desulfurization gypsum is a byproduct of limestone–gypsum desulfurization. Preparation of desulfurization gypsum in CaCO3 and (NH4)2SO4 is a means of recycling. This paper presents integrated reaction and separation equipment and illustrates the desulfurization gypsum operation efficiency. Different additives and stirring programs …
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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.
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— 1. Introduction. According to the U.S. Energy Information Administration's statistics, in the 2006–2016 period, approximately 42% of the electricity consumed in the U.S.A was produced by coal combustion (U.S. Energy Information Administration, 2018).The coal combustion process generates various types of residues such as fly ash, …
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— More than 5% of FGD gypsum can be produced using coal with 1% sulfur content [9]. The chemical composition of FGD gypsum is CaSO 4 ·2H 2 O, identical to …
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— A flue gas desulfurization process capable of producing a high purity gypsum and also making equipment employed as minimum as possible is provided, which process comprises the steps of cooling and ...
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— As a result, the serious environmental problems may be caused. It was reported that soot materials can be made by desulfurized gypsum, fly ash and lime, producing strength in the process of consolidation reaction, which are used as pavement sub-base or land leveling sand [19], [20], [21].
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— The mass ratio of fly ash/desulfurization gypsum has the greatest impact on its fluidity, with a maximum decrease of 27% when it increases from 2:1 to 3:1; The flowability of desulfurized gypsum–fly ash …
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— The RM was pretreated using our previous method [15], and the FA was not pretreated and the DG was dried at 105℃.After that, the RM, DG and FA were used to supplementary cementitious materials to replace cement in equal amounts, and the mortar test blocks of RM-cement, RM-FA-cement and RM-FA-DG-cement were prepared …
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— The utilization rate of gypsum in sintering was calculated, and the results showed that gypsum decomposition was the limiting factor in the reaction mechanism of …
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— According to the hydration products and micro-morphological analysis in Section 3.5 and Section 3.6, the hydration reaction process of gypsum-based composite cementitious materials was elucidated, ... As …
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— The process of science mapping and visualizing different elements within bibliometric records is widely regarded as one of the most challenging aspects of pioneering research [57][58][59][60] [61 ...
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— However, due to the low hydration activity of fly ash, the heat release during the entire hydration process is small, and the hydration reaction is slow, resulting in the problem of low early strength in the system of fly ash and desulfurized gypsum . In our previous work, the feasibility of using the calcined FGD gypsum and fly ash as the ...
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— Tan et al. studied the process parameters of direct wet mineralization of CO 2 with desulfurized gypsum and established a reaction model of direct wet mineralization …
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— The utilization rate of gypsum in sintering was calculated, and the results showed that gypsum decomposition was the limiting factor in the reaction mechanism of calcium ferrite synthesis, the ...
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— CS desulfurization pH is not easy to control, easy to block the pipeline, gypsum moisture content is high, and dehydration is not easy. The pH of CS slurry is 12.45, and that of desulfurized gypsum is 3.33. The pH span is large and difficult to control, which will lead to the oxidation of CS desulfurized gypsum and the formation of CaSO 3 ·0 ...
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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 …
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