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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The effects of adding an organic acid or using a limestone with a fine particle size distribution (PSD) have been examined in a wet flue gas desulphurisation (FGD) pilot plant.
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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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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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incorporates a high desulfurization potency and produces desulfurized mineral as a by-product. WFGD may be a methodology of riveting absorb SO 2 through a vapor–liquid contact by …
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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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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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SAC is produced by the calcination of limestone, alumina, and gypsum. Compared to OPC, a reduced amount of limestone is required [15] ... Future research should further investigate the effects of desulfurized gypsum on the different properties of BSAC, such as tensile strength, durability, and volume stability, while establishing the ...
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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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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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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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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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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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Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure. November 2023; Construction and Building Materials 404(5):133302;
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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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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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Wet flue gas desulfurization was simulated to improve gypsum production using low-grade limestone. High-grade limestone with 94 wt% CaCO3 content is used for producing …
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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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Desulfurization gypsum (DG) is an industrial by-product of limestone-gypsum wet desulfurization of coal-fired flue gas, which is usually ... The chemical effect is mainly due to the similar ionic radius and the ... fly ash and desulfurized gypsum based eco-friendly road base materials. J. Clean. Prod., 284 (2021), Article 124777. View PDF ...
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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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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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Desulfurized gypsum exhibits lower sulfate content and higher solubility than natural gypsum. The effect of desulfurized gypsum on the hydration, workability and strength development of LC 3 are studied. The heat evolution of LC 3 is closely related to its moisture …
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The grindability of desulfurized gypsum is better than natural gypsum, and the desulfurized gypsum itself is a fine powdery material. When grinding, it has a grinding effect on clinker and other mixed materials, make the cement with much more fine particles and a significantly larger specific surface.
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The effect of hydrolyzed wheat protein retarder, citric acid retarder and sodium hexametaphosphate on the setting time and the strength loss of FGD gypsum was investigated and the retarding action ...
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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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In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated. Moreover, the action mechanisms of FG and FGD gypsum on the properties of alkali slag cement were analyzed. The results show that both the FG and FGD …
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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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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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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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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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