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كسارة مخروطية سلسلة HCS
Influence of crystal-transforming agent on the performance …
Under dry conditions, FGD will lose part of the crystallization water and become β-hemihydrate gypsum. Under saturated vapour pressure, it will lose amount of the crystallization water and become α-hemihydrate gypsum. ... Desulfurized gypsum is used primarily in construction, agriculture, the chemical industry, and other industries (Qian et ...
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Retarding effect of impurities on the transformation kinetics …
Desulfurized building gypsum (DBG) has great application potential and can be used to produce lightweight plastering gypsum (LPG). ... Pilot scale preparation of α-calcium sulfate hemihydrate from FGD gypsum in Ca–K–Mg aqueous solution under atmospheric pressure. Baohong Guan Bao Kong Hailuo Fu Jie Yu Guangming Jiang Li Yang.
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Method for preparing calcium sulfate crystal whiskers from desulfurized …
The invention discloses a method for preparing calcium sulfate crystal whiskers from desulfurized gypsum under normal pressure. The method comprises the following steps: 1) pickling; 2) dissolving; 3) rotating crystal; and 4) crystallizing, after crystallizing, carrying out solid-liquid separation, washing filter cake with water, and drying to obtain calcium sulfate crystal whiskers.
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Recent advances in flue gas desulfurization gypsum …
Natural gypsum can be used in concrete production as a replacement for calcium aluminate cement (CAC), opening the possibility of replacing the natural gypsum with FGDG in this application with success, even though some studies have reported a reduction of compressive strength and water solubility when compared to conventional cement mixtures ...
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Utilizations of preheated flue gas desulfurization gypsum …
Current study proposes an effective way to modify the properties of super-sulfated cement (SSC) paste and mortar with preheated flue gas desulfurization (FDG) gypsum at …
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Desulfurized gypsum regulates the hydration and …
The type of hydration products is determined mainly by the ratio of gypsum and C 4 A 3 S ̅ in BSAC [33], [34]. When the gypsum content is sufficient in the early hydration stage, the main hydration product is AFt. Once the gypsum is depleted, AFm becomes the main hydration product [35]. In addition, the type of gypsum also affects the ...
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CN218280723U
CN218280723U CN202222088012.7U CN202222088012U CN218280723U CN 218280723 U CN218280723 U CN 218280723U CN 202222088012 U CN202222088012 U CN 202222088012U CN 218280723 U CN218280723 U CN 218280723U Authority CN China Prior art keywords funnel flask gypsum slurry desulfurized gypsum slurry according Prior art date Legal …
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Recent advances in flue gas desulfurization gypsum …
Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. ... But, under forced oxidation CaSO 4.2H 2 O is dominant (>90%) (Córdoba, 2015). ... (Oriza sativa L.) growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China ...
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Experimental study on preparation of α-hemihydrous gypsum …
In the process of preparing α-hemihydrous gypsum from desulfurized gypsum under atmospheric pressure, the optimum conditions of crystallization transformation and modification of desulfurized gypsum were studied. The effects of the type and concentration of composite salts (CaCl2, KCl, MgCl2 mixed solution) on the crystallization and modification of desulfurized …
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Influence of Calcined Flue Gas Desulfurization Gypsum and …
In order to improve the early strength of fly ash blended cement concrete under steam curing conditions, fly ash was partly substituted by calcined flue gas desulfurization (FGD) gypsum and active calcium aluminate. ... At present, the industrial utilization of desulfurized gypsum has become one of the main research directions of scholars ...
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Experimental and simulation study of flue gas
Our study provides new insights into the complex interactions and optimization strategies of the limestone-gypsum flue gas desulfurization process in a high CO 2 environment through …
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Experimental study of permeability evolution in modified
In the context of low-carbon economy and sustainable development, industrial by-products are being gradually converted into green building materials.The effect of groundwater on the properties of modified desulfurization gypsum must be examined to increase its application in shotcrete supporting structures in underground engineering. In this study, triaxial compression …
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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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Full article: Cover Crop Complements Flue Gas Desulfurized Gypsum …
The DHA, as an index of overall microbial activity, was consistently higher (by 33 to 34%) under both FGD-gypsum and cover crop, when compared to the control. The UA increased by 13% and 26% under FGD-gypsum and cover crop, respectively, compared to the control. There were significant positive impacts of FGD-gypsum x cover crop on UA.
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Experimental and simulation study of flue gas
Under partial pressure, SO 2 molecules diffuse from the gas phase to the gas-liquid interface, and then penetrate through the gas-liquid interface into the liquid phase. The gas-liquid interface is defined as the boundary between the gas film and the liquid film. ... The particles of desulfurized crystallized gypsum exhibit characteristics of ...
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Mechanical and Microscopic Properties of Copper …
DOI: 10.1007/s12205-022-0782-1 Corpus ID: 253540729; Mechanical and Microscopic Properties of Copper-contaminated Soil Solidified with Calcium Carbide Residue, Metakaolin, and Desulfurization Gypsum under Freeze-thaw Cycles
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Promotion of conversion activity of flue gas …
In recent years, researchers have conducted extensive experiments on the preparation of α-HH from DH under mild conditions, and found that the phase transition can be achieved in the …
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Experimental investigation of modified desulfurized gypsum …
: To comprehend the permeability behavior of modified desulfurized gypsum-based concrete under varying stress conditions, this investigation conducted permeability assessments under …
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Pilot scale preparation of α-calcium sulfate hemihydrate …
In the process of preparing α-hemihydrous gypsum from desulfurized gypsum under atmospheric pressure, the optimum conditions of crystallization transformation and modification of desulfurized gypsum … Expand. PDF. 1 Excerpt; Save.
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A brief review on flue gas desulfurization gypsum recovery …
The accumulation of a large amount of flue gas desulfurized gypsum (FGDG) not only occupies valuable land resources, but also the harmful substances such as fluorine and heavy metals in FGDG may increase environmental risks. ... At atmospheric CO 2 pressure, the solubility products of CaSO 4 ·2H 2 O and CaCO 3 are affected by pH. 54 According ...
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Preparation of α-High-Strength Hemihydrate from …
Preparation of α-High-Strength Hemihydrate from Flue Gas Desulfurization Gypsum in AlCl 3–MgCl 2 Solution at Atmospheric Pressure. An industrially feasible process was proposed to produce α-calcium sulfate …
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Gas Desulfurization Gypsum-Based Polymer Materials
Abstract: To resolve problems caused by the accumulation of flue gas desulfurization gypsum (FGDG) in the environment, a polymer material was prepared using FGDG, granulated blast …
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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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Utilization of low-quality desulfurized ash from semi-dry …
Under the condition of the roasting temperature of 1050 °C, SO2 partial pressure of 0.003, CO partial pressure of 0.85, and residence time of 60 min, the tin content in the roasted iron ...
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Promotion of conversion activity of flue gas …
solution [8−12] under ambient pressure. Compared with the inorganic acid solution and salt solution, the glycerol-water solution method has the ... at 100 r/min for 30 min under room temperature. Finally, the gypsum after hydration was filtered and dried at 60 °C to constant weight. 2) Preparation of α-HH in glycerol-water
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Influence of Calcined Flue Gas Desulfurization Gypsum and …
To solve the problem of the low early strength of the fly ash-desulfurized gypsum system, this study innovatively uses sulfate to increase its early strength without shrinking late …
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The Key Application Technology of Desulfurized …
mortar. Desulfurized gypsum is an industrial by-product gypsum obtained after flue gas desulfurization in coal-fired or oil-fired power plants [1]. Its main components and physical and chemical properties are basically the same as natural gypsum, with higher purity and smaller particle size. Since desulfurized gypsum contains water
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Investigation on the compressive strength of desulfurization gypsum binary cementitious materials with low energy …
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 …
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Influence of Seed Crystal and Modifier on the Morphology of …
Preparation of α-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) gypsum is of great value in effectively utilizing the FGD gypsum. This paper focuses on the effect of seed crystal and some modifiers on the morphology of α-HH on a 500-1000 kg/batch setup based on a salt solution method established on the previous work. The pilot tests were …
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Utilizations of preheated flue gas desulfurization gypsum …
Current study proposes an effective way to modify the properties of super-sulfated cement (SSC) paste and mortar with preheated flue gas desulfurization (FDG) gypsum at different temperatures and durations, and different sulfate compositions. Preheated FGDs with temperatures between 25 and 150 °C and durations between 0 and 24 h were used to replace …
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Preparation, characterization and application of red mud, fly …
DOI: 10.1016/j.jclepro.2020.124777 Corpus ID: 226335113; Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials
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Preparation of α-High-Strength Hemihydrate from Flue Gas
An industrially feasible process was proposed to produce α-calcium sulfate hemihydrate (α-HH) from FGD gypsum without any additives. In this process, an AlCl3 solution was used to promote the conversion of calcium sulfate dihydrate (DH) to hexagonal prismatic α-HH with high strength at atmospheric pressure. The phase transition kinetics of FGD gypsum …
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Performance regulation of desulfurized gypsum on solid …
Additionally, under hot-dry conditions, low-sulfur type monosulfate (3CaO·Al 2 O 3 ·CaSO 4 ·12 H 2 O,AFm) can form stably, while under normal temperature curing conditions, AFm can transform back into ettringite, leading to volume expansion and further deterioration of …
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Characterization and optimization of desulfurized construction gypsum
Characterization and optimization of desulfurized construction gypsum modified with functionalized nanocellulose ... followed by mechanical disintegration using a high-pressure homogenizer at a pressure of 800 bar for 5 passes. ... (0.5 wt% of gypsum) and retarder (0.05 wt% of gypsum) under constant stirring at 1000 rpm for 3 min; (3) the ...
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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. ... A higher compression modulus was anticipated under the soaked condition when using NaOH, which would cause less settlement during construction. ... Fig. 13 showed the relationship between the pressure and the ...
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Experimental study of permeability evolution in modified
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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