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Desulfurized gypsum regulates the hydration and hardening …

In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), …

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

With the addition of desulfurized gypsum, the overall compressive strength of the ternary system was higher than that of the binary system, because CaSO 4 ·2H 2 O is the main mineral phase in FGDG.SO 4 2− has a sulfate-stimulating effect that improves the gelling activity of FA [7] and generates hydrated aluminosilicate and other gelling ...

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Combined Application of Desulfurization Gypsum and Biochar for …

Desulfurization gypsum is a product of flue-gas desulfurization of harmful gases produced during coal combustion in thermal power plants . ... (Oriza sativa L.) growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma 2012, 187, 24–30. [Google Scholar] Yu, H.; Yang, P.; Lin, H.; Ren, S.; He, X ...

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

The interior of RFDC6 contains many gel and ettringite, which reduces the number of harmful pores in RFDC6 matrix and improves the density of RFDC6 matrix. Therefore, the mechanical performances of RFDC6 is the highest. ... fly ash and desulfurized gypsum based eco-friendly road base materials. J. Clean. Prod., 284 (2021), Article 124777. View ...

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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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Performance regulation of desulfurized gypsum on solid waste …

Desulfurization gypsum (DG) is a solid waste byproduct from treating sulfur-containing flue gases in power plants. DG is subjected to long-term stockpiling due to its high sulfate content and the …

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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 …

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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 …

A large amount of FGD gypsum is required to promote plant growth, although desulfurized flue gas with high boron and low levels of CaSO 3 is harmful to plant growth. …

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the harm of desulfurized gypsum powder in Oman

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 … WhatsApp: +86

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Preparation, characterization and application of red mud, fly ash …

Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base ...

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Preparation, characterization and application of red mud, fly ash …

Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3 ) molar ratio, and its mechanical properties, durability, microstructure and environmental performance were investigated.

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The Effects of Combined Retarders on the Properties of Desulfurized Gypsum

Abstract. 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 effects of the retarder type and content on the setting inhibition and mechanical properties of desulfurized …

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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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ect of Industrial Byproduct Gypsum on the Mechanical …

gypsum, phosphogypsum, and titanium gypsum, whic h account for 88% of the total BPG in China. The large-scale utilization of these three types of solid waste is crucial for the safe disposal of BPG.

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Effect of Mineral Admixtures on Physical, Mechanical, and

In the future, the effects of three-phase composition, particle size of desulfurization building gypsum, and multiple mineral admixtures on the performance of gypsum-based self …

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Amendment of Saline–Alkaline Soil with Flue-Gas Desulfurization Gypsum

The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies. Thus, the changes in the levels of soil salinity, alkalinity, crop yield, and other physicochemical properties in different soil types and crops after reclamation and planting with …

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Study on the Improvement Effect of Desulfurization Gypsum in …

As the waste of coal-fired power plant, desulphurization gypsum is mainly composed of CaSO 3 and CaSO 4, which can replace Na+ in saline-alkali soil to improve saline-alkali soil.In order to study the effect of different dosage of desulfurization gypsum on the improvement of saline-alkali land, field experiments were carried out in Duiziliang Town, …

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American-Made Drywall Emerges as Potential Danger

Nearly half of American drywall is now made with this synthetic product, known as flue gas desulfurized gypsum or FGD gypsum. Despite its increasing popularity, synthetic gypsum isn't regulated...

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Properties and microstructure of soil solidified by titanium slag …

The Portland cement-fly ash-desulfurized gypsum composite solidifier brings the dredged soil to have higher strength and good resistance to dry-wet cycles ... However, the contents of harmful heavy metal ions in titanium slag are very low, and the leaching risks of heavy metal ions are negligible when applied to soil solidification [34], [35 ...

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Effects of saline improvement and leaching of desulphurized gypsum

In order to investigate the effect of leaching, gypsum and furfural residue on soil properties and yield of oil sunflower planted in newly reclaimed takyric solonetz land, a comparative field experiment in 2012 was conducted at the farmland of Ningxia Xi Da Tan of China (106°24'209"E, 38°50'289"N). Three leaching amount (3600, 4500 and 4800 ...

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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-product

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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. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material ...

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Characterization and optimization of desulfurized construction gypsum

The rapid expansion of coal-fired power plants has led to a significant increase in the production of flue gas desulfurization (FGD) gypsum, a byproduct of sulfur dioxide emission control processes [1], [2].With annual global output reaching millions of tons, FGD gypsum poses substantial environmental challenges due to its large-scale accumulation and potential …

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Summary of research progress on industrial flue gas desulfurization

SO 2 causes great harm to the environment and humans. Historically, famous smog events such as the Maas Valley smog, London smog, ... Desulfurized gypsum can not only improve saline-alkali soils and increase crop yields; it can also be used as an additive to make cement, concrete, wall materials, etc. The sodium-alkali method is widely used in ...

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Preparation, characterization and application of red mud, fly ash …

Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3) molar ratio, and its mechanical properties, durability, microstructure and environmental performance were …

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Desulfurization gypsum uses and properties

Desulfurization gypsum has few harmful components. When used as a cement retarder, it can basically replace natural gypsum. The prepared cement performance is not much different …

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

@article{Wang2023SynergisticEO, title={Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure}, author={Yaguang Wang and Xiaoming Liu and Xiang Zhu and Wenxi Zhu and Jianwei Yue}, journal={Construction and Building Materials}, year={2023}, url={https://api ...

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Development of slag-based filling cementitious materials and their

The experimental analysis revealed that the influence of the desulfurized gypsum content on the strength at 3, 7, and 28 days is greater than that of the cement clinker content. Integrating the results from the orthogonal experiment and the RBF neural network predictions, the optimal mix ratio was identified as 11 % desulfurized gypsum, 12 % ...

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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 2172-2176 in ...

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