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Promotion of conversion activity of flue gas desulfurization …
Abstract: The massive accumulation of flue gas desulfurization (FGD) gypsum produced in the wet limestone-gypsum flue gas desulfurization process not only encroaches on lands but also …
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Recent advances in flue gas desulfurization gypsum processes …
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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The effects of desulfurized gypsum on the mechanical properties …
Geopolymer is an emerging green cementitious material that can be used to stabilize dredged clay (DC) as construction materials. This paper presented an experimental study on the effects of desulfurized gypsum (DG) on the mechanical properties (e.g., stress-strain characteristics, unconfined compressive strength (UCS) and water stability) of stabilized DC …
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Effect of Industrial Byproduct Gypsum on the Mechanical …
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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Potential of desulfurized gypsum as a sulfate alternative in …
Yi P. et al. Potential of desulfurized gypsum as a sulfate alternative in preparing solid waste-based limestone calcined clay cement (LC3) and its effects on early properties // Journal of Building …
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Application of flue gas desulfurization gypsum improves multiple
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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Improving the removal of fine particles by chemical agglomeration
Limestone and gypsum particles are slightly soluble in water and therefore, 99.7% alcohol was used as the dispersive phase of the experiment. An electrical low-pressure impactor (ELPI, Dekati Ltd., Finland) was used to determine the real-time concentration and size distribution (range = 0.030–9.314 μm; aerodynamic diameter based on the ...
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Integrated Assessment of the Environmental and …
To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone, a kind of lime/gypsum flue gas desulfurization …
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Effect of Polyethylene-Grafted Maleic Anhydride on the …
Download Citation | Effect of Polyethylene-Grafted Maleic Anhydride on the Properties of Flue-Gas Desulfurized Gypsum/Epoxy Resin Composites | Waste resource utilization can save energy, reduce ...
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Study on the influence mechanism of flue gas desulphurisation gypsum …
Flue gas desulphurisation gypsum (FGDG) mainly refers to the solid by-product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur-containing fuels, such as coal and petroleum [1].In the limestone gypsum flue gas desulphurisation process, 2.7 tons of FGDG can be produced for every 1 ton …
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Integrated Assessment of the Environmental and Economic Effects …
To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone, a kind of lime/gypsum flue gas desulfurization (FGD) collaborative desulfurized gypsum resource utilization process (LCS) was proposed. The system mainly includes the LCS-LFGD (lime/gypsum flue gas desulfurization system), LCS-C (desulfurized gypsum reduction …
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The Effects of Combined Retarders on the Properties of Desulfurized Gypsum
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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Flue Gas Desulfurization Gypsum
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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Effects of hybrid fibers on properties of desulfurized gypsum …
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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Effect of Polyethylene-Grafted Maleic Anhydride on the
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 [].The gross production of …
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Research on optimizing performance of desulfurization-gypsum …
However, semi-hydrated desulphurized gypsum mainly contained calcium sulfate dihydrate (CaSO 4 ·2H 2 O) and calcium sulfate hemihydrate (CaSO 4 ·1/2H 2 O). This phenomenon was caused by the effect of the calcination temperature on the phase change of desulfurized gypsum promoting the removal of crystalline water from dihydrate.
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Effect of Flue Gas Desulfurization Gypsum on the Properties of …
This work aims to investigate the effect of additional flue gas desulfurization gypsum (FGDG) on the properties of calcium sulfoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS). The hydration rate, setting time, mechanical strength, pore structure and hydration products of the CSAC-GGBFS mixture containing FGDG were …
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Effect of ratio of desulfurization gypsum to carbide slag on low …
Using SEM at a magnification of 8000×, photographs of desulfurized gypsum and carbide slag were taken, as shown in Fig. 1. From the images, it can be observed that the desulfurized gypsum appears as elongated blocky shapes, distributed loosely, while the carbide slag appears as small spherical granules, distributed evenly and densely.
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A comprehensive review of flue gas desulphurized gypsum: …
In order to control the rapidly rising air pollution and reduce its adverse effects on socio-economic development, a few key steps were taken by the ... such as natural gypsum and OPC. ii) Investigate the various production techniques of FGD gypsum, including wet limestone, wet lime, and seawater scrubbing methods. iii) Examine the potential ...
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FACTORS EFFECTING EFFICIENCY PREDICTION OF …
FACTORS EFFECTING EFFICIENCY PREDICTION OF LIMESTONE-GYPSUM WET FLUE GAS DESULPHURIZATION BASED ON OXIDATION REACTION ... Theoretical investigations for effects of various operative variables on the SO 2 ... Desulfurized mineral (CaSO 4) is generated once the suspension that absorbs SO 2 below the scrubber is dehydrated (Koralegedara et al ...
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Recycling waste gypsum and calcium carbide slag for …
In this study, the potential of using desulfurized gypsum (DG), phosphogypsum (PG), gypsum dihydrate (G), and calcium carbide slag (CS) in the production of supersulfated cement (SSC) was investigated. The effects of …
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Effects of different gypsum varieties on the hydration and …
Red mud (RM) is the major waste with strong alkaline discharge produced in alumina manufacturing. The main chemical compositions are Fe 2 O 3, Al 2 O 3, and SiO 2, which are similar to those of the raw materials for SAC.RM is a kind of waste with large output and serious pollution, and its effective disposal is the important problem facing the environment at …
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Potential of desulfurized gypsum as a sulfate alternative in …
Semantic Scholar extracted view of "Potential of desulfurized gypsum as a sulfate alternative in preparing solid waste-based limestone calcined clay cement (LC3) and its effects …
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Potential of desulfurized gypsum as a sulfate alternative in …
DOI: 10.1016/j.jobe.2024.111335 Corpus ID: 274039786; Potential of desulfurized gypsum as a sulfate alternative in preparing solid waste-based limestone calcined clay cement (LC3) and its effects on early properties
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Research on optimizing performance of desulfurization-gypsum …
The undisturbed desulfurization gypsum used in the experiments was obtained by natural air drying for 14 d, crushed by a crusher, and then passed through a 0.15-mm square-hole sieve. The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and
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Preparation, characterization and application of red mud, fly ash …
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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Recent advances in flue gas desulfurization gypsum processes …
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 gypsum, because natural gypsum has a higher CaCO 3 content, hence a higher ANC. The authors reported relatively high Hg content in FGDG amended soil, but no significant difference ...
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Effects of decomposed straw and desulfurized gypsum on salt
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 straw and desulfurized …
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Production and resource utilization of flue gas desulfurized gypsum …
The resulting product still met building requirements. Yang et al. [11] studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG ...
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Effect of desulphurization gypsum on hardening mechanism of the
Desulphurization gypsum (DG) is the by-product of wet desulphurization of flue gas in power plant, with a large yields and low resource utilization rate. However, it is rich in CaSO4·2H2O. This work reused the DG for the activation of steel slag (SS)-alkalied-granulated blast furnace slag (GBFS) and produced a DG–SS–GBFS-based geopolymer. The …
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