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Dehydration Pathways of Gypsum and the …
In the high-temperature and low water vapor pressure region, gypsum dehydrates to form γ-CaSO 4 in a single-step process (CaSO 4 ·2H 2 …
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Carbon Dioxide Sequestration with Flue Gas Desulfurization (FGD) Gypsum
FGD gypsum was carbonated in aqueous suspensions to study its reaction mechanisms. Process variables, such as L/S ratio and reaction time, were systematically varied, and their influence on the carbonation rate was investigated. The carbonation reaction was found that the carbonation of Ca took place in two subsequent steps (i.e. dissolution ...
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Desulfurized gypsum regulates the hydration and hardening …
In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), and the hydration and hardening process of BSAC with different DG content was studied.
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Process for the hydrothermal conversion of gypsum from flue-gas
Process for the hydrothermal conversion of industrial waste gypsum into calcium sulphate α-hemihydrate by heating of an aqueous suspension of gypsum under pressure to …
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Review of hydration and hardening properties of steel slag in mine
Using steel slag for the preparation of mine backfill materials is vital to utilizing its resources. Therefore, this study reviewed the impact of different processing technologies and sources on the physical and chemical properties of steel slag, analyzed the application modes and hydration mechanisms of six kinds of steel slag backfill cementitious materials, and discussed the …
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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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Separating Sulfur from Fuel Gas Desulfurization Gypsum with an …
1. Introduction. Sulfur dioxide (SO 2) is a harmful gas that can cause acid rain, and it is mainly from the combustion of coal and petroleum. 1−3 In the current fuel gas purification system, the limestone gypsum wet desulfurization technique is widely used as an efficient and stable method for removing SO 2 from coal-fired fuel gas. 4 The main byproduct of wet …
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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 …
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Development and Application of Flue Gas Desulfurized Gypsum …
In the whole process of the grouting ... an organic substance with the chemical formula C 6 H 11 NaO 7, is highly soluble in water and appears as a white crystalline powder. The pH of SG is neutral, and its melting point is 206 °C. ... 2024. "Development and Application of Flue Gas Desulfurized Gypsum and Blast-Furnace-Slag-Based Grouting ...
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Production and resource utilization of flue gas desulfurized gypsum …
Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is calcium sulfate dihydrate, which also …
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Cost Effective and Accurate pH Measurement in Limestone …
Absorption process Reaction formula; Ca(OH)2 + CO2 -> CaCO3 + H2O, 2CaCO3 + 2SO2 + 1/2H2O -> 2CaSO3·1/2H2O + CO2 In this process, it is important to promote the reaction of …
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Desulfurization gypsum uses and properties
The desulfurization gypsum in thermal power plants is mainly produced by the limestone-gypsum wet desulfurization process. The method uses limestone as a desulfurizing agent, and sprays the absorbent slurry into the tower to fully …
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Effect of curing temperature on the reaction kinetics of …
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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Experimental investigation of utilizing waste flue gas desulfurized
Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. ... The first occurs immediately after water is applied to the hydration reactions, in which the free C a O is converted to Ca ... The bearing capacity of the backfill materials can be obtained from the blow counts ...
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(PDF) Emission reduction process for dechlorinating flue‐gas
The test results indicated that the average dechlorination rate of the emission reduction process was 80.4%, which is equivalent to 97.5% of the conventional process.
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A comprehensive review of flue gas desulphurized gypsum: …
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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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, …
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Production and resource utilization of flue gas desulfurized gypsum …
Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6, 10], has been an important alternative ...
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Performance Analysis and Improvement of Gypsum Board …
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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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Effect of desulfurized gypsum whiskers on the adsorption
Sintering process made red mud and desulfurized gypsum whiskers adhere evenly and closely, inducing the spilling out of crystal water to form porous structures favorable for the adsorption of Pb(II). ... When the reaction was finished, took out the mixed solution, ... The fitting of Temkin equation to the Pb(II) removal process also showed a ...
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Effect of Combined Application of Desulfurization Gypsum and …
Saline-alkali soil imposes severe adverse effects on soil utilization and agriculture production worldwide. Amelioration of saline-alkali soil is crucial to ensure global food security and promote sustainable agricultural development. Here, the effects of the combined application of soil amendment desulfurization gypsum (G) and KIA (K, an industrial organic by-product) on soil …
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Dehydration Pathways of Gypsum and the Rehydration
Their experimental results reveal that gypsum dehydration proceeds through only a single CaSO 4 ·2H 2 O → γ-CaSO 4 step when the ambient water vapor pressure is less than 26664 Pa; however, a two-step process of CaSO 4 ·2H 2 O → β-CaSO 4 ·0.5H 2 O → γ-CaSO 4 is observed if the practical water vapor pressure is greater than 40 130 Pa ...
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Insights into the thermodynamic and kinetics of selective recovery …
The sulfation agent used in this study was desulfurized gypsum which is a by-product of the limestone/gypsum production process. The main composition of the gypsum is shown in Table 2. The XRD pattern shown in Fig. 2 (a) indicates that the gypsum waste is mainly composed of CaSO 4 ·2H 2 O, SiO 2, and KCl.
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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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Utilization of semi-dry sintering flue gas desulfurized ash for SO2
The iron and steel industry is one of the largest SO 2 emitters and energy consumers in China. The emission of SO 2 during the sintering process accounts for 50%–80% of all iron and steel production [1].With the rapid development of industry, environmental pollution is increasingly caused by SO 2.Therefore, to control the emission of SO 2 in sintering flue gas …
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Effects of Different Admixtures on the Mechanical and Thermal
Desulfurization gypsum is an industrial by-product produced during the process of wet flue gas desulfurization using limestone–gypsum in coal-fired power plants, and its main component is calcium sulfate dihydrate (CaSO 4 ·2H 2 O). Compared with natural gypsum, desulfurization gypsum has a more stable composition with smaller particle size and less …
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Mechanical Properties and Coagulation Characteristics of Flue …
In the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO 2 removed . A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) . A substantial amount of desulfurized gypsum is generated as a by-product ...
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Effect of Mineral Admixtures on Physical, Mechanical, and
Guo et al. [ 32] determined that a 75% desulfurization gypsum, 5% cement, and 20% mineral powder ratio yielded FGDG blocks with good physical properties.
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The Ratio Optimization and Strength Mechanism of Composite …
The specific computational process is as follows. ... the matrix data were made dimensionless initially by Formula (2) during the grey correlation analysis, thereby obtaining a new data matrix ... In the early stage of hydration reaction, the slag and desulfurized gypsum had the greatest influences, which were attributed to the AFt produced by ...
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