Characterization of flue gas desulphurized (FGD) gypsum of …

Thermal Power Plant generates FGD gypsum as by-product during coal combustion. This study evaluates the characterization (spectroscopic and elemental), potentially toxic elements (PTEs ...

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Analysis of Strength and Microstructural Characteristics of …

The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage of waste. Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. …

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Reclamation of saline-sodic soil properties and improvement …

The desulfurized gypsum not only has a high content of gypsum (> 900 g kg − 1) but also has a low price < 50¥ t − 1. We therefore conducted a study to determine how effective desulfurized gypsum is at reducing sodicity, improving the physical and chemical properties of the soil, and improving the growth and yield of rice in these saline ...

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Effect of Polyethylene-Grafted Maleic Anhydride on the …

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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Experimental study on the desulfurized gypsum and steel …

With steel slag and desulfurized gypsum as main raw material,mixed appropriate amount slag and compound addition a little of activator,and based on orthogonal test,we explored the slag dosage,the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker-free cementing material,such as …

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Improvement of Saline-Alkaline Soil via Flue Gas Desulfurization Gypsum

[21] Tobert HA and Watt DB 2014 Impact of flue gas desulfurization gypsum application on water quality in a coastal plain soil J Environ Qual 43 273-280. Google Scholar [22] Tong ZJ, Li QS and Zhou YS 2009 Effects of desulfurized gypsum on heavy metal desorption and speciations in tidal flat reclaimed soil Eco and Environ Sci 18 2172 …

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The influences of MSWI fly ash washing and blast

The optimal ratio parameters determined through orthogonal experiments were a mass ratio of 51% blast furnace slag (BFS), 17% BA, 20% WFA1, and 12% flue gas desulfurized gypsum (FGDG). The FBM containing WFA1 exhibited strong macroscopic performance, with a compressive strength of 37.42 MPa for FB2 at 28 days.

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Performance Analysis and Improvement of Gypsum Board …

Research on the method of improving the influence of chloride ion on the performance of desulfurized gypsum products [J]. New building materials. 2014, 11: 41-45.

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The Effects of Combined Retarders on the Properties of Desulfurized Gypsum

As a relatively fast-setting building material, desulfurized gypsum is difficult to use. Citric acid, sodium gluconate, and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders. The ef

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Application of Flue Gas Desulfurization Gypsum and Its Impact …

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, …

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Superfine Desulfurization Gypsum can Improve the Strength …

Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with …

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A comprehensive review of flue gas desulphurized gypsum: …

FGD gypsum is a by-product of flue gas desulfurization (FGD) to remove sulfur dioxide emissions from coal-fired power plants. It has various applications in construction, agriculture, and gypsum board manufacturing, but also some drawbacks …

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Utilization of low-quality desulfurized ash from semi-dry …

This work aimed to investigate the feasibility of utilizing the low-quality desulfurization ash from semi-dry flue gas desulfurization by mixing with α-hemihydrate gypsum, and then the environmental issues resulted from low-quality desulfurized ash from semi-dry flue gas desulfurization can be resolved, and both economic and …

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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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Production and resource utilization of flue gas desulfurized …

This article reviews the properties, production, and applications of flue gas desulfurized gypsum (FGD gypsum) in China, a by-product of coal combustion. It also …

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Gas Desulfurization Gypsum-Based Polymer Materials

the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [4]. A substantial amount of desulfurized gypsum is generated as a by …

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Synergistic effect of red mud, desulfurized gypsum and fly …

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 is to … Expand

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Study on improving properties of desulfurized gypsum …

Two kinds of inorganic reinforcing materials, single Portland cement clinker, compound Portland cement clinker and mineral powder, were used to analyze the effects of desulfurized gypsum on the properties of desulfurized gypsum based cementation material. The results show that either single Portland cement clinker or compound …

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Effects of hybrid fibers on properties of desulfurized gypsum …

DOI: 10.1016/j.conbuildmat.2023.131840 Corpus ID: 258997305; Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials @article{Lv2023EffectsOH, title={Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials}, author={Fangtao Lv …

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Improvement in Water Resistance of Desulfurized …

Ltd.); Desulfurization gypsum (Huainan Thermal Power Plant). The content of -hemihydrate gypsum and dihydrate gypsum are 71.4% and 14.7%, respectively. Meanwhile, the chemical composition and phase XRD spectrum of the desulfurized gypsum are shown in Table 1 and Fig. 1, respectively; the TG-DSC analysis curve is shown in Fig. 2;

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Study on the influence mechanism of flue gas desulphurisation gypsum …

Semantic Scholar extracted view of "Study on the influence mechanism of flue gas desulphurisation gypsum on solid waste-based geopolymer grouting materials" by Dedan Duan et al. ... Effect of curing temperature on the reaction kinetics of cementitious steel slag-fly ash-desulfurized gypsum composites system. Siyu Duan Hao Wu Ke …

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Sustainable effects of gypsum from …

Reclamation of saline–sodic soils with gypsum from the desulphurization of flue gas (FGD) is a recently developed technique. However, limited information is available on the long-term effects of …

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Production of SO2 Gas: New and Efficient Utilization of Flue …

To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO2 gas by adding a mixture of FGDG and pyrite into a boiling furnace and utilizing its high-temperature waste heat is proposed. Using the FactSage 6.1 Reaction module and the Equilib module, the …

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Recent advances in flue gas desulfurization gypsum …

The presence of hazardous elements such as arsenic, mercury, cadmium, lead, and selenium in FGDG has reduced its beneficial value.

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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 unclear. ...

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Gas Desulfurization Gypsum-Based Polymer Materials

the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [4]. A substantial amount of desulfurized gypsum …

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Influence of Early Strength Agent on the Strength and

The test takes the cementing system composed of ordinary Portland cement and desulfurized building gypsum as the research object, and the research is carried out based on the mechanism of the early strength agent that can accelerate the cement hydration reaction in the composite cementing system. In the experiment, the influence …

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Emission reduction process for dechlorinating …

The treatment of flue-gas desulfurization (FGD) gypsum, a common solid waste material that is often affected by chloride ions, typically occupies large amounts of land, causes resource waste, and results in …

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