Separating Sulfur from Fuel Gas Desulfurization Gypsum with an …

1. Introduction. Sulfur dioxide (SO 2) is a harmful gas that can cause acid rain, and it is mainly from the combustion of coal and petroleum. 1−3 In the current fuel gas purification system, the limestone gypsum wet desulfurization technique is widely used as an efficient and stable method for removing SO 2 from coal-fired fuel gas. 4 The main byproduct of wet …

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(PDF) Emission reduction process for dechlorinating flue‐gas

The test results indicated that the average dechlorination rate of the emission reduction process was 80.4%, which is equivalent to 97.5% of the conventional process.

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Desulphurization mechanism and engineering practice of carbide …

CS desulfurization pH is not easy to control, easy to block the pipeline, gypsum moisture content is high, and dehydration is not easy. The pH of CS slurry is 12.45, and that of desulfurized gypsum is 3.33. The pH span is large and difficult to control, which will lead to the oxidation of CS desulfurized gypsum and the formation of CaSO 3 ·0 ...

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Performance Analysis and Improvement of Gypsum Board …

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Effects of Different Admixtures on the Mechanical and Thermal

Desulfurization gypsum is an industrial by-product produced during the process of wet flue gas desulfurization using limestone–gypsum in coal-fired power plants, and its main component is calcium sulfate dihydrate (CaSO 4 ·2H 2 O). Compared with natural gypsum, desulfurization gypsum has a more stable composition with smaller particle size and less …

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A comprehensive review of flue gas desulphurized gypsum: …

Chemical reactions involved in the process of conversion of SO 2 gas into FGD gypsum is as follows [8], [10] ... Moreover, the solid waste desulfurized gypsum is used as a sulfate activator. The macroscopic experimental results show that the addition of 2 % biochar can reduce the fluidity of composites by 12.5 % but increase the 28-day ...

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A brief review on flue gas desulfurization gypsum recovery toward

Tan et al. studied the process parameters of direct wet mineralization of CO 2 with desulfurized gypsum and established a reaction model of direct wet mineralization of CO 2 with desulfurized gypsum in an ammonia medium system. 60 There is a competition between the CO 2 absorption reaction and NH 2 COO − hydrolysis reaction, in which the CO 2 ...

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Recent advances in flue gas desulfurization gypsum processes …

The chemical reactions involved can be ... "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the dissolution process. Calcium sulfate gypsum of 98% purity was obtained after three consecutive cycles of purification. ... growth and yield using desulfurized gypsum in the west of Songnen Plain ...

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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. However, during the past decade, the rate of beneficially used FGDG has gradually …

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Emission reduction process for dechlorinating flue‐gas …

ical formula is CaSO 4·2H 2O, and pure gypsum is white in color. However, gypsum typically contains impurities, Received: 23 September 2019 | Revised: 9 February 2020 | Accepted: 10 February 2020 DOI: 10.1002/ese3.666 PERSPECTIVES Emission reduction process for dechlorinating flue-gas desulfurization gypsum and reducing wastewater effluents:

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Recycling waste gypsum and calcium carbide slag for …

In this study, the potential of using desulfurized gypsum (DG), phosphogypsum (PG), gypsum dihydrate (G), and calcium carbide slag (CS) in the production of supersulfated cement (SSC) was investigated. The effects of …

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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), and the hydration and hardening process of BSAC with different DG content was studied.

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A comprehensive review of flue gas desulphurized gypsum: …

The process of science mapping and visualizing different elements within bibliometric records is widely regarded as one of the most challenging aspects of pioneering research [57][58][59][60] [61 ...

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Utilization of semi-dry sintering flue gas desulfurized ash for SO2

The iron and steel industry is one of the largest SO 2 emitters and energy consumers in China. The emission of SO 2 during the sintering process accounts for 50%–80% of all iron and steel production [1].With the rapid development of industry, environmental pollution is increasingly caused by SO 2.Therefore, to control the emission of SO 2 in sintering flue gas …

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

This shows that within a suitable alkalinity range, it is beneficial to improve the hydration reaction. 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 ...

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Summary of research progress on industrial flue gas desulfurization

In the industrial production of China, the processing of phosphate rock, volcanic eruptions, kerosene combustion and aluminum smelting will lead to flue gas emissions containing a large amount of SO 2.SO 2 is a highly irritating gas. Because SO 2 is freely soluble in water and enters the respiratory tract, it can generate corrosive sulfurous acid, sulfuric acid, and sulfate …

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Review of hydration and hardening properties of steel slag in mine

Using steel slag for the preparation of mine backfill materials is vital to utilizing its resources. Therefore, this study reviewed the impact of different processing technologies and sources on the physical and chemical properties of steel slag, analyzed the application modes and hydration mechanisms of six kinds of steel slag backfill cementitious materials, and discussed the …

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The mechanism of preparation calcium ferrite from desulfurization

The gypsum decomposition and formation mechanisms of calcium ferrite are the main focus areas of theoretical research (Higuchi et al., 2016; Dilner et al., 2017; Zheng and Ning, 2013) related to desulfurization gypsum.In a study on gypsum decomposition, Zhang (Zhang and Ren, 2015) evaluated the reduction of CaSO 4 using coke as a reducing agent, and concluded …

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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 ...

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Cost Effective and Accurate pH Measurement in Limestone …

Absorption process Reaction formula; Ca(OH)2 + CO2 -> CaCO3 + H2O, 2CaCO3 + 2SO2 + 1/2H2O -> 2CaSO3·1/2H2O + CO2 In this process, it is important to promote the reaction of …

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desulfurized gypsum, also known as FGD gypsum

The lime slurry reacts with SO2 to generate calcium sulfate and calcium sulfite, and calcium sulfite is converted into calcium sulfate by oxidation to obtain industrial by-product gypsum, called …

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Effect of Combined Application of Desulfurization Gypsum and …

Saline-alkali soil imposes severe adverse effects on soil utilization and agriculture production worldwide. Amelioration of saline-alkali soil is crucial to ensure global food security and promote sustainable agricultural development. Here, the effects of the combined application of soil amendment desulfurization gypsum (G) and KIA (K, an industrial organic by-product) on soil …

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Process for the hydrothermal conversion of gypsum from flue-gas

Process for the hydrothermal conversion of industrial waste gypsum into calcium sulphate α-hemihydrate by heating of an aqueous suspension of gypsum under pressure to …

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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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FGD-Gypsum Waste to Capture CO2 and to Recycle in Building …

The use of waste to capture CO 2 has been on the rise, to reduce costs and to improve the environmental footprint. Here, a flue gas desulfurization (FGD) gypsum waste is proposed, which allows us to obtain a CaCO 3-based solid, which should be recycled.The CO 2 capture stage has primarily been carried out via the direct carbonation method or at high …

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Optimization design and characterization of slag cementitious

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]. ... Incorporation of lime and desulfurized gypsum modified the alkaline environment of LGDCM. Specifically, when the Ca/Si ratio falls between 1.8 and 4.9 ...

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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, …

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Production and resource utilization of flue gas desulfurized gypsum …

Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6, 10], has been an important alternative ...

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Experimental Study on the Carbonation Properties of Dry Desulfurized Gypsum

The carbonized mineral was dry desulfurized gypsum (H Company, South Korea), and the CO 2 gas was of a reagent grade (purity: 99.9%). The content of dry desulfurized gypsum and mixing water was controlled to prepare a slurry, and distilled water was used as …

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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. ... The first occurs immediately after water is applied to the hydration reactions, in which the free C a O is converted to Ca ... The bearing capacity of the backfill materials can be obtained from the blow counts ...

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