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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This shows that within a suitable alkalinity range, it is beneficial to improve the hydration reaction. With the addition of desulfurized gypsum, the overall compressive strength of the ternary system was higher than that of the binary system, because CaSO 4 ·2H 2 O is the main mineral phase in FGDG.SO 4 2− has a sulfate-stimulating effect ...
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The lime slurry reacts with SO2 to generate calcium sulfate and calcium sulfite, and calcium sulfite is converted into calcium sulfate by oxidation to obtain industrial by-product gypsum, called …
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The use of waste to capture CO 2 has been on the rise, to reduce costs and to improve the environmental footprint. Here, a flue gas desulfurization (FGD) gypsum waste is proposed, which allows us to obtain a CaCO 3-based solid, which should be recycled.The CO 2 capture stage has primarily been carried out via the direct carbonation method or at high …
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The gypsum decomposition and formation mechanisms of calcium ferrite are the main focus areas of theoretical research (Higuchi et al., 2016; Dilner et al., 2017; Zheng and Ning, 2013) related to desulfurization gypsum.In a study on gypsum decomposition, Zhang (Zhang and Ren, 2015) evaluated the reduction of CaSO 4 using coke as a reducing agent, and concluded …
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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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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 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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The ultra-high addition of 20 % desulfurized gypsum is beneficial to improve the strength of DG-based binary cementitious materials with low energy consumption. ... Due to the continuous reaction of sulphate in DG with Ca 2+ and reactive silicates/aluminosilicates during the curing process, the crystals of ettringite (AFt) are generated and ...
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The chemical reactions involved can be ... "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the dissolution process. Calcium sulfate gypsum of 98% purity was obtained after three consecutive cycles of purification. ... growth and yield using desulfurized gypsum in the west of Songnen Plain ...
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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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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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The carbonized mineral was dry desulfurized gypsum (H Company, South Korea), and the CO 2 gas was of a reagent grade (purity: 99.9%). The content of dry desulfurized gypsum and mixing water was controlled to prepare a slurry, and distilled water was used as …
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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 of CO 2 with desulfurized gypsum in an ammonia medium system. 60 There is a competition between the CO 2 absorption reaction and NH 2 COO − hydrolysis reaction, in which the CO 2 ...
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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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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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Influence of Reaction Parameters on Solid Outputs in CO 2 Mineralization of Desulfurized Gypsum. Yu Dou 1,2, Wenxuan Wang 3, Chunlei Fan 4, ... Southeast University, Nanjing 210096, Jiangsu, China 2 Key Laboratory of Energy Thermal Conversion and Process Measurement and Control, Ministry of Education, Southeast University, Nanjing 210096 ...
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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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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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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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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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The hydration process of solid-waste belite sulphoaluminate cement regulated by desulfurization gypsum was studied. ... evolution, strength development and alternating-current (AC) impedance characteristics of BSAC mortar with different desulfurized gypsum content were characterized by X-ray diffraction, scanning electron microscopy, nuclear ...
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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. However, during the past decade, the rate of beneficially used FGDG has gradually …
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Chemical reactions involved in the process of conversion of SO 2 gas into FGD gypsum is as follows [8], [10] ... Moreover, the solid waste desulfurized gypsum is used as a sulfate activator. The macroscopic experimental results show that the addition of 2 % biochar can reduce the fluidity of composites by 12.5 % but increase the 28-day ...
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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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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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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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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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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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