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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Potential of desulfurized gypsum as a sulfate alternative in …
Desulfurized gypsum (DG) presents significant challenges in recycling with the rapid development of industrialization. To explore the feasibility of DG as a sulfate source in producing limestone calcined clay cement (LC3), this study investigates the differences between LC3 samples containing DG and those containing natural gypsum (NG) in terms of hydration, …
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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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Experimental study of permeability evolution in modified
In this study, triaxial compression tests with permeability measurements were carried out for modified desulfurization gypsum by simulating underground engineering …
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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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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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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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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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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 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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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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(PDF) The Key Application Technology of Desulfurized Gypsum …
The results show that adding desulfurized gypsum, which accounts for 6% to 8% of the total mass of the cementitious material, has no adverse effect on the workability and can significantly improve ...
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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 both confining pressure and unloading circumstances. The findings suggest that an escalation in confining pressure results in a reduction in the specimen's permeability.
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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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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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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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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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Experimental study of permeability evolution in modified
Semantic Scholar extracted view of "Experimental study of permeability evolution in modified desulfurization gypsum under complete stress–strain process" by Weipei Xue et al. Skip to search form Skip to main ... Production and resource utilization of flue gas desulfurized gypsum in China - A review. Sen Liu Wei Liu Fen Jiao W. Qin Cong-ren Yang.
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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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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 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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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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Performance of a Composite Soil Prepared with Red Mud and Desulfurized …
Given the great environmental pressure brought by the massive stacking of solid waste, red mud and desulfurized gypsum were used to prepare cementitious materials.
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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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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. ... Flexural and compressive strength of α-high-strength gypsum is exceptionally high compared to ordinary gypsum ...
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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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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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KR100443246B1
The present invention relates to a method for producing a high value-added α-type hemihydrate gypsum (α-CaSO 4 1 / 2H 2 O) from desulfurized gypsum, which is expected to continuously increase production in the future, and is promising to be used. In case of pressurization method which needs to be manufactured under high pressure and temperature conditions for the …
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Calcium sulfate whisker one-step preparation using semi …
The raw materials for preparation of CSWs in these studies were predominantly derived from natural gypsum, desulfurized gypsum, and industrial waste liquid. However, due to the different desulfurization processes, semi-dry FGD ash (FGDA) cannot be used directly as a resource because it contains a large amount of CaSO 3 0.5H 2 O.
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Cover Crop Complements Flue Gas Desulfurized …
Integration of flue gas desulfurized gypsum (FGD-gypsum) with cover crops is expected to improve soil quality (SQ). Our objectives were to evaluate the ... Agricultural soils are under the pressure of intensification to achieve food security to meet the demands of population growth. About 33% of soils worldwide is moderate to
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