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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Desulfurized ash contains about 21.33% hemihydrate calcium sulfite, 18.11% calcium carbonate, 28.55% dihydrate gypsum, 25.81% calcium hydroxide, 1.85% calcium oxide. Particle size distributions of hemi-hydrate gypsum and desulfurized ash are given in Fig. 1 A. The specific surface areas of desulfurized ash and hemihydrate gypsum are 351 and
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The construction industry generally uses gypsum in powder form. When it is heated in its natural solid form, it loses its water molecules and becomes a powder. This is known as plaster in the construction industry. Applying different amounts of heat to the gypsum will give you different types of plaster. ... Can gypsum cause harm? Although ...
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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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The main components of the blast furnace slag powder were CaO (43.19%), SiO 2 (25.52%), Al 2 O 3 (12.60%), and MgO (15.21%), as shown in Table 2. Due to the FGDG powder mainly comprising gypsum and the BFS powder being amorphous without crystalline phases, X-ray diffraction analysis (XRD) did not detect specific mineral phases in either material.
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from Desulfurized Gypsum with High Chloride Ion Content To cite this article: Dongjie Yin et al 2020 IOP Conf. Ser.: Mater. Sci. Eng. 740 012048 ... desulfurized gypsum powder was added,
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To address these challenges, this paper aimed to prepare high-performance composite blast furnace slag powder (CBFS) by incorporating red mud (RM), fly ash (FA), desulfurization gypsum (DG) and BFS, guided by the synergistic effects and the theory of medium-calcium systems.
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F lue gas desulfurization gypsum (FGDG) is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite (CaCO 3) to form calcium sulfite (CaSO 3 ·0.5H 2 O), which is further treated with wet limestone and forced oxidization to form calcium sulfate (CaSO 4 ·2H 2 O) (Laperche and Bigham, 2002).Synthetic …
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What is Gypsum? Gypsum is a soft sulphate mineral with a white or grey colour, known scientifically as calcium sulphate dihydrate. It has the chemical formula CaSO4 2H2O, meaning it's made up of calcium, sulphur, …
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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.
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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. ... "G90-D10" indicates that the cementitious material consists of 90 % blast furnace ore powder and 10 % desulphurization gypsum. ... in which the harmful heavy metals are adsorbed on ...
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The application discloses the use of desulfurized gypsum. The modified desulfurized gypsum subjected to the thermal calcination treatment for removing the crystal water is applied to the hot-melt welding powder. The desulfurized gypsum can perform oxidation-reduction reaction with aluminum magnesium powder and the like at high temperature, and meanwhile, the …
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500g hemihydrate gypsum and 3g modified corn starch, 340g water were weighed. Porous mineral materials and starch were added into the water, fully stirred, desulfurized gypsum powder was added, and the gypsum slurry was stirred to form gypsum slurry. Before the initial setting of gypsum slurry, it
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Li et al. added cement, fly ash, and lime to gypsum and observed that the compressive strength increased when the ratio of cement, fly ash, and lime was 10%, 20%, and 14.86%, respectively. Guo et al. determined that a 75% desulfurization gypsum, 5% cement, and 20% mineral powder ratio yielded FGDG blocks with good physical properties.
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Its fineness generally ranges from 40 to 60 um. (The fineness is greater than 160 is 0.7%, the fineness between 160 and 180 mesh is 4.23%, the fineness between 180 and 200 …
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Desulfurized gypsum has high water content and high fluidity, only suitable for belt transportation. Desulfurization gypsum and natural gypsum are different in dehydration, grindability and mechanical properties of calcined gypsum …
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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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The degree of composite cementitious material influence on 7 d strength is slag > desulfurized gypsum > fly ash > clinker; the degree of influence on 28 d strength is: fly ash > slag ...
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The fineness of desulfurized construction gypsum is fine, the specific surface area is large, the particle size range is narrow, the water consumption of the standard consistency is high, the thixotropy and workability are poor, the anti-sagging property and construction operability are also poor, and the surface finish of gypsum products is ...
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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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A method for co-producing sulphoaluminate cement and sulfur by using desulfurized gypsum and aluminum ash, comprising: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing the aluminum ash with the semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized …
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The removal of high concentration flue gas sulfur dioxide (SO2) using manganese carbonate ore desulfurization (MCO-FGD) is a promising route that combines economic benefits and pollution control.
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Desulfurized gypsum and phosphogypsum are the two most used types of industrial by-product gypsum, and they are also the most common. Desulfurization gypsum is a substance with calcium sulfate as the main …
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Desulfurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gas from burning coal or oil. 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 ...
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The wet limestone-gypsum powder desulfurization technology is used in coal-fired power plants (Cui et al., 2021; ... This study focuses on the influence of groundwater seepage; however, to better realize the usage and effect of modified desulfurized gypsum in the design of spray layer support structure, the follow-up research will include ...
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Red mud (RM) is an alkaline solid waste that is discharged during the alumina extraction process [3], [4].Fly ash (FA), which has a high concentration of silica-alumina minerals, is a significant solid waste discharged during the coal-fired power production processs [5], [6].Desulfurization gypsum (DG) is the primary solid waste discharged during flue gas …
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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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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 ...
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In the early stage of hydration reaction, the slag and desulfurized gypsum had the greatest influences, which were attributed to the AFt produced by further reaction between desulfurized gypsum and slag hydration products. Cement clinker had the weakest influences on both the 7-d and 28-d strengths.
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Desulfurization gypsum (DG) is a solid waste byproduct from treating sulfur-containing flue gases in power plants. DG is subjected to long-term stockpiling due to its high sulfate content and the …
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