A comprehensive review of flue gas desulphurized gypsum: Production, properties, and applications

Aakriti,; Maiti, Soumitra; Jain, Neeraj; Malik, Jaideep

doi:10.1016/j.conbuildmat.2023.131918

Cited by 26 publications

(3 citation statements)

References 139 publications

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“…Waste recycling: The application of CSWs promotes waste recycling and reuse. In particular, in the treatment of coal mine waste and flue gas desulfurization in coal-fired power plants, the generated calcium sulfate waste can reduce the cost of waste treatment and minimize environmental pollution [ 99 ].…”

Section: Potential Benefits Of Cswsmentioning

confidence: 99%

Application of Calcium Sulfate Whiskers to Cement-Based Materials: A Review

Liu,

Liao,

Sha

et al. 2024

Materials

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In recent years, significant attention has been paid to the use of calcium sulfate whiskers (CSWs) to enhance the performance of cement-based materials (CBM). This technology has attracted widespread interest from researchers because it enhances the performance and sustainability of CBM by modifying the crystal structure of calcium sulfate. This article summarizes the fundamental properties and preparation methods of calcium sulfate whisker materials as well as their applications in cement, potential advantages and disadvantages, and practical applications and prospects. The introduction of CSWs has been demonstrated to enhance the strength, durability, and crack resistance of CBM while also addressing concerns related to permeability and shrinkage. The application of this technology is expected to improve the quality and lifespan of buildings, reduce maintenance costs, and positively impact the environment. The use of CSWs in CBM represents a promising material innovation that offers lasting and sustainable advancement in the construction industry.

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Section: Potential Benefits Of Cswsmentioning

confidence: 99%

Application of Calcium Sulfate Whiskers to Cement-Based Materials: A Review

Liu,

Liao,

Sha

et al. 2024

Materials

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“…Flue gas desulfurization (FGD) gypsum is one of the varieties of synthetic gypsum. In 2020, global FGD gypsum production reached 255 million tons [ 1 ]. Most of the FGD gypsum was produced in Asia (55%), followed by Europe (22%), North America (18%) and the rest of the world (5%) [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

“…In 2020, global FGD gypsum production reached 255 million tons [ 1 ]. Most of the FGD gypsum was produced in Asia (55%), followed by Europe (22%), North America (18%) and the rest of the world (5%) [ 1 ]. FGD gypsum is obtained from the desulphurization of combustion gases in fossil fuel power plants.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Compressive Strength of Anhydrite Binder Using Full Factorial Design

Nizevičienė,

Kybartienė,

Jusas

2023

Materials

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Flue gas desulfurization gypsum (FGD gypsum) is obtained from the desulphurization of combustion gases in fossil fuel power plants. FGD gypsum can be used to produce anhydrite binder. This research is devoted to the investigation of the influence of the calcination temperature of FGD gypsum, the activators K2SO4 and Na2SO4, and their amount on the compressive strength of anhydrite binder during hydration. The obtained results showed that as the calcination temperature increased, the compressive strength of anhydrite binder decreased at its early age (up to 3 days) and increased after 28 days. The compressive strength of the anhydrite binder produced at 800 °C and 500 °C differed more than five times after 28 days. The activators K2SO4 and Na2SO4 had a large effect on the hydration of anhydrite binder at its early age (up to 3 days) in comparison with the anhydrite binder without activators. The presence of the activators of either K2SO4 or K2SO4 almost had no influence on the compressive strength after 28 days. To determine which factor, the calcination temperature of FGD gypsum (500–800 °C), the hydration time (3–28 days) or the amount (0–2%) of the activators K2SO4 and Na2SO4, has the greatest influence on the compressive strength, a 23 full factorial design was applied. Multiple linear regression was used to develop a mathematical model and predict the compressive strength of the anhydrite binder. The statistical analysis showed that the hydration time had the strongest impact on the compressive strength of the anhydrite binder using activators K2SO4 and Na2SO4. The activator K2SO4 had a greater influence on the compressive strength than the activator Na2SO4. The obtained mathematical model can be used to forecast the compressive strength of the anhydrite binder produced from FGD gypsum if the considered factors are within the same limiting values as in the suggested model since the coefficient of determination (R2) was close to 1, and the mean absolute percentage error (MAPE) was less than 10%.

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A novel approach of using SiC for the reductive decomposition of industrial by‐product gypsum

Miao,

Yan

2024

Can J Chem Eng

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In this study, thermodynamic calculations indicate that using silicon carbide (SiC) as an additive for the reductive decomposition of industrial by‐product (IBP) gypsum is a feasible method to lower decomposition temperature and avoid the generation of liquid phase. Experimental results show that the decomposition rate of IBP gypsum exceeded 90% at 950°C for 2 h, while avoiding the generation of liquid phase. In addition, it was found that an intermediate product, 2Ca2SiO4·CaSO4, was generated during the decomposition process. Through the reaction mechanism and kinetics analysis of IBP gypsum and SiC, the decomposition process can be divided into two steps. The first step was the conversion of CaSO4 to 2Ca2SiO4·CaSO4 (decomposition rate <60%), and the chemical reaction was the controlling step. The second stage was the conversion of 2Ca2SiO4·CaSO4 to Ca2SiO4 (decomposition rate >60%), and three‐dimensional diffusion was the controlling step. This novel method not only successfully lowered the decomposition temperature of IBP gypsum, but also avoided liquid phase generation.

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A comprehensive review of flue gas desulphurized gypsum: Production, properties, and applications

Cited by 26 publications

References 139 publications

Application of Calcium Sulfate Whiskers to Cement-Based Materials: A Review

Application of Calcium Sulfate Whiskers to Cement-Based Materials: A Review

Analysis of Compressive Strength of Anhydrite Binder Using Full Factorial Design

A novel approach of using SiC for the reductive decomposition of industrial by‐product gypsum

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