As shown in Table 1, the main components of flue gas desulfurization gypsum are SO3, CaO, and bound water [34]. The main components of phosphogypsum and red gypsum are similar to those of FGDG, but they contain more impurities.…"
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This research aims to study the utilization of waste from power plants, construction and demolition, and agriculture by varying the ratios of flue-gas desulfurization (FGD) gypsum, construction and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used these as the raw materials for the production of concrete bricks of 15 × 15 × 15 …
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desulfurization (FGD) gypsum, phosphogypsum (PG), and fluoro gypsum. FGD gypsum is a by-product of the recovery of sulfur oxides from the flue gases generated at power plants that burn …
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The selection of superplasticizers plays a crucial role in optimizing the performance of phosphogypsum and desulfurization gypsum. Gypsum, as a traditional inorganic cementitious material, is widely used in construction due to its lightweight, soundproof, and fire-resistant properties, making it a highly developed green building material ...
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This paper aims to explore the potential use of flue gas desulfurisation gypsum (FGDG) and phosphogypsum (PG) into cemented paste backfill (CPB). The … WhatsApp: +86
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Gypsum is especially beneficial to clay soils and is also used to treat sodic soils. As a source of gypsum, phosphogypsum can and does substitute natural gypsum as a soil amendment in many countries, including Australia, Brazil, and Spain, to name a few. Studies have even found that the application of phosphogypsum can increase crop yields in ...
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The technological process of recovering gypsum from phosphogypsum was obtained using a single flotation process test, a scavenging test, and a cleaning test. To obtain …
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The production of flue gas desulfurization gypsum poses a serious threat to the environment. Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out as a promising and effective approach to address the issue. β-hemihydrate gypsum, cement, polycarboxylate superplasticizer, hydroxypropyl methyl cellulose ether (HPMC), retarder, and deer were …
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12 Phosphogypsum: Properties and Potential Use in Agriculture 233. Fig. 2 . Diagram summarizing the ecological impacts of phosphogypsum storage (Chernysh et al. 2021; Rutherford et al. 1993;Tayibietal. 2009) 2.2.2 Discharge into the Sea . Phosphogypsum discharged into the sea dissolves rapidly due to its high solubility.
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Through designing, operating and simulating a bubbling fluidized bed PG decomposition desulfurization reaction system, this study clarifies the reasons for the PG desulfurization difficulty, and points out potential solutions.
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This study investigated the effects of combined (mixed) application of desulfurization gypsum and biochar on crop growth and soil properties in the saline-alkali soils of coastal mudflats through indoor pot experiments and eight …
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About 100–200 million years ago, the mineral gypsum (calcium sulfate dihydrate [CaSO 4 ·2H 2 O]) became precipitated as a result of the evaporation of seawater. It is deposited in sedimentary layers in the marine environment. Under high pressure and temperature, gypsum is transformed into anhydrite (CaSO 4).In nature, gypsum and anhydrite occur as beds or …
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The massive accumulation of flue gas desulfurization (FGD) gypsum produced in the wet limestone-gypsum flue gas desulfurization process not only encroaches on lands but also causes serious environmental pollution. The preparation of α-hemihydrate gypsum (α-HH) is an important way to achieve high-value utilization of FGD gypsum. Although the glycerol-water …
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In this study, we used thermodynamic calculations to analyze the material and energy balances of the phosphogypsum desulfurization process and to calculate the energy …
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desulfurization (FGD) gypsum, phosphogypsum (PG), and fluoro gypsum. FGD gypsum is a by-product of the recovery of sulfur oxides from the flue gases generated at power plants that burn coal. A natural contaminant of coal, sulfur is almost completely converted to sulfur oxide (SOx) when coal is burned. FGD processes result
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An industrially feasible process was proposed to produce α-calcium sulfate hemihydrate (α-HH) from FGD gypsum without any additives. In this process, an AlCl3 solution was used to promote the conversion of calcium sulfate dihydrate (DH) to hexagonal prismatic α-HH with high strength at atmospheric pressure. The phase transition kinetics of FGD gypsum …
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Three significant industrial gypsum by-products are flue-gas desulfurization gypsum (FGDG) [13], which is produced from coal combustion after the wet desulfurization of flue gas; phosphogypsum (PG ...
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The industrial application of PG is mainly focused on building gypsum (β-CaSO 4 ·0.5H 2 O) [5], α-hemihydrate gypsum (α-CaSO 4 ·0.5H 2 O, α-HH) [6], [7], cement retarder [8], sulfuric acid co-production cement [9], soil conditioner [10] and so on. Among which, the preparation of α-HH using PG is one of the most profitable approaches because α-HH is a high …
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In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of …
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Preparation of α-hemihydrate gypsum (α-HH) from phosphogypsum (PG) by atmospheric hydrothermal method has a good application prospect due to the mild reaction conditions, the solution medium and ...
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In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum …
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Phosphogypsum releases have a detrimental effect on flora and fauna and also cause economic loss due to the loss of sulfur. This study contributes to solving this problem …
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A technology making use of waste phosphogypsum to produce gypsum blocks comprises the steps of processing the waste phosphogypsum by a raw material room, and carrying out the sections of rotary drying and mixed pressing respectively after purification. The phosphogypsum is made into building gypsum packaged finished products after rotary drying, grinding and …
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Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is calcium sulfate dihydrate, which also …
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Gypsum has long been used as a soil conditioner and fertiliser but it is only recently that gypsum's potential for reducing agricultural emissions to waterways has been researched. Gypsum (CaSO 4.2H 2 O) can improve soil aggregation through calcium induced flocculation of particles and sulfate induced leaching of excess sodium. Such effects ...
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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 …
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Flue gas desulfurization (FGD) gypsum is an industrial by-product in coal-fired power plants. It is mainly composed of calcium sulfate dihydrate and minor amounts of impurities, such as sodium sulfate, potassium sulfate, magnesium sulfate, and chloride [1].The gross product of FGD gypsum has reached 550 million tons in China by 2016 [2].There is an urgent necessity …
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The use of phosphogypsum waste in the production of building industry products, as well as for obtaining building gypsum is one of the most promising directions in the utilization of this mass ...
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posing of desulfurization gypsum or Phosphogypsum to producing CaO and SO 2 is another promising utilization method for cement as well as sulfuric acid. The technologi-cal process includes drying, dehydration, calcining, cement firing, sulfur dioxide purification, sulfur dioxide absorption and so on. The main reactions are as follows:
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Desulfurization gypsum is a kind of solid waste with CaSO 4 ‧2H 2 O as the main component produced in the process of limestone-based flue gas desulfurization. About 100 million tons of desulfurization gypsum was produced every year in China (Wang et al., 2020).On the one hand, it has a high content of Ca 2+ and is suitable for CO 2 sequestration. On the other hand, …
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