Development and Application of Flue Gas Desulfurized Gypsum …

The main components of the blast furnace slag powder were CaO (43.19%), SiO 2 (25.52%), Al 2 O 3 (12.60%), and MgO (15.21%), as shown in Table 2. Due to the FGDG powder mainly comprising gypsum and the BFS powder being amorphous without crystalline phases, X-ray diffraction analysis (XRD) did not detect specific mineral phases in either material.

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Performance Analysis and Improvement of Gypsum Board …

from Desulfurized Gypsum with High Chloride Ion Content To cite this article: Dongjie Yin et al 2020 IOP Conf. Ser.: Mater. Sci. Eng. 740 012048 ... desulfurized gypsum powder was added,

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Optimization design and characterization of slag cementitious

Desulfurization gypsum (DG) is an industrial solid waste obtained by using lime to recover SO 2 gas in flue gas. Its chemical reaction process is shown in equation (1).Due to the limited effective treatment methods, a large amount of DG dumped has an unavoidable negative impact on environment [13].The main chemical composition of DG is CaSO 4 ·2H 2 O, which …

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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. ... this combination could be harmful because acrylamides have been deemed as neurotoxins (Lapin et al., 1982, Prasad and Muralidhara, ... growth and yield using desulfurized gypsum in the west of ...

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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.

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High value-added utilization of desulfurized building gypsum …

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 was to improve. comprehensive properties of GSL and prepare qualied desulfurized building gypsum-based self-leveling

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The Ratio Optimization and Strength Mechanism of Composite …

In the early stage of hydration reaction, the slag and desulfurized gypsum had the greatest influences, which were attributed to the AFt produced by further reaction between desulfurized gypsum and slag hydration products. Cement clinker had the weakest influences on both the 7-d and 28-d strengths.

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The source and difference of desulfurization gypsum …

Desulfurization gypsum is a substance with calcium sulfate as the main component obtained by forced oxidation reaction after the countercurrent mass transfer of flue gas and desulfurizer slurry in the desulfurization reaction …

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The source and difference of desulfurization gypsum …

Desulfurized gypsum and phosphogypsum are the two most used types of industrial by-product gypsum, and they are also the most common. Desulfurization gypsum is a substance with calcium sulfate as the main …

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(PDF) The Ratio Optimization and Strength Mechanism of …

The degree of composite cementitious material influence on 7 d strength is slag > desulfurized gypsum > fly ash > clinker; the degree of influence on 28 d strength is: fly ash > slag ...

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The fineness of desulfurisation gypsum affects the performance of

Its fineness generally ranges from 40 to 60 um. (The fineness is greater than 160 is 0.7%, the fineness between 160 and 180 mesh is 4.23%, the fineness between 180 and 200 …

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Effect of Mineral Admixtures on Physical, Mechanical, and

Li et al. added cement, fly ash, and lime to gypsum and observed that the compressive strength increased when the ratio of cement, fly ash, and lime was 10%, 20%, and 14.86%, respectively. Guo et al. determined that a 75% desulfurization gypsum, 5% cement, and 20% mineral powder ratio yielded FGDG blocks with good physical properties.

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Solid waste-based dry-mix mortar using fly ash, carbide slag, and …

For example, Duan et al. [7] used FA, steel slag, and desulfurized gypsum to prepare cementitious composite materials; they found that the three ingredients had a synergistic effect. ... Self-cementitious property of steel slag powder blended with gypsum. Construct Build Mater, 113 (2016), 10.1016/j.conbuildmat.2016.03.102. Google Scholar

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Effect of ratio of desulfurization gypsum to carbide slag on low …

Using SEM at a magnification of 8000×, photographs of desulfurized gypsum and carbide slag were taken, as shown in Fig. 1. From the images, it can be observed that the desulfurized gypsum appears as elongated blocky shapes, distributed loosely, while the carbide slag appears as small spherical granules, distributed evenly and densely.

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A comprehensive review of flue gas desulphurized gypsum: …

The evolution of the morphology is determined by the preferential adsorption of the modifier on different surfaces of the α-HH gypsum crystals. These results and fundamental understanding should provide useful information for improving the synthesis of α-HH gypsum using flue gas desulfurized gypsum.

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Research on optimizing performance of desulfurization-gypsum …

The undisturbed desulfurization gypsum used in the experiments was obtained by natural air drying for 14 d, crushed by a crusher, and then passed through a 0.15-mm square-hole sieve. The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and

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Summary of research progress on industrial flue gas desulfurization

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] .

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WO2018166220A1

A method for co-producing sulphoaluminate cement and sulfur by using desulfurized gypsum and aluminum ash, comprising: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing the aluminum ash with the semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized …

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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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Uses of desulfurized gypsum-Hanmero Desulfurization gypsum

Gypsum powder is one of the five major gel materials, occupies an important position in the national economy, widely used in construction, building materials, industrial molds and art models, chemical industry and agriculture, food processing and medicine beauty and many other applications, is an important industrial raw materials.

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Synergistic preparation of high-performance composite blast …

Red mud (RM) is an alkaline solid waste that is discharged during the alumina extraction process [3], [4].Fly ash (FA), which has a high concentration of silica-alumina minerals, is a significant solid waste discharged during the coal-fired power production processs [5], [6].Desulfurization gypsum (DG) is the primary solid waste discharged during flue gas …

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Main uses of power plant desulfurization gypsum | LZZG

The gypsum desulfurized in power plants is only a primary product and needs to be reprocessed. However, as a kind of waste, we must rationalize resources and can do many …

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Research on optimizing performance of desulfurization-gypsum …

The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and dehydrated for 2 h under synchronous heating with the box. ... Investigation into the synergistic effects in hydrated gelling systems containing fly ash, desulfurization gypsum and steel mineral powder. Constr. Build ...

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Utilization of low-quality desulfurized ash from semi-dry flue gas

The removal of high concentration flue gas sulfur dioxide (SO2) using manganese carbonate ore desulfurization (MCO-FGD) is a promising route that combines economic benefits and pollution control.

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Effect of Industrial Byproduct Gypsum on the Mechanical …

1. Introduction. BPG is an industrial solid waste primarily composed of calcium sulfate. Its main components include desulfurized gypsum (DG), phosphogypsum (PG), and titanium gypsum (TG), with smaller amounts of fluorogypsum, salt gypsum, and others [1,2,3].Figure 1 shows the distribution proportions of BPG sources in China. BPG contains various impurities and harmful …

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Experimental study of permeability evolution in modified

The wet limestone-gypsum powder desulfurization technology is used in coal-fired power plants (Cui et al., 2021; ... This study focuses on the influence of groundwater seepage; however, to better realize the usage and effect of modified desulfurized gypsum in the design of spray layer support structure, the follow-up research will include ...

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desulfurized gypsum, also known as FGD gypsum

Desulfurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gas from burning coal or oil. The technology is to grind lime-limestone into powder through a desulfurized gypsum mill, and then configure it into a slurry, so that the SO2-containing flue gas after dust removal is ...

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Silage and flue gas desulfurized gypsum as additives improve …

Silage and flue gas desulfurized gypsum as additives improve green waste composting ... When in contact with water, the FGDG in T8 could also release heat. The FGDG used in this experiment was a very fine powder ... when the duration of the thermophilic period (≥ 50 ℃) exceeds 3 days, most of the harmful microorganisms and toxic substance ...

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Synergistic effect of red mud, desulfurized gypsum and fly ash in

To address these challenges, this paper aimed to prepare high-performance composite blast furnace slag powder (CBFS) by incorporating red mud (RM), fly ash (FA), desulfurization gypsum (DG) and BFS, guided by the synergistic effects and the theory of medium-calcium systems.

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Properties and microstructure of soil solidified by titanium slag …

A titanium slag powder (TS) was used, which was obtained from Pangang Group Co., Ltd. A flue gas desulfurized gypsum (FGD) was also used, which was obtained from Baogang Building Materials Co., Ltd. The main mineral phases of TS are amorphous with some titanium carbide (TiC) and the mineral phase of FGD is mainly hemihydrate gypsum (‎‎ Fig. 1).

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