Preparation of α-calcium sulfate hemihydrate from
And combining the preparation of α-HH with the recovery of valuable impurities from PG seems a promising way to solve the bulk deposition of PG. Keywords: α-calcium sulfate hemihydrate, industrial by-product gypsum, FGD gypsum, phosphogypsum, preparation
Charlar en LíneaPreparation of alpha-calcium sulfate hemihydrate from FGD gypsum
2016.6.15 Introduction. The rigid regulation of sulfur dioxide emission in China has triggered the intense and wide application of lime/lime stone wet flue gas desulfurization
Charlar en LíneaPreparation of alpha-calcium sulfate hemihydrate from FGD gypsum
2016.6.15 The effect of particle size on the transformation kinetics of flue gas desulfurization (FGD) gypsum to α-calcium sulfate hemihydrate (α-HH) in calcium
Charlar en LíneaA Feasible Route for Preparation of Calcium Sulfate Whiskers
2023.6.14 EI Hall et al. studied the effects of cetylammonium pyridine chloride (CPC) on gypsum crystallization and found that the free energy of gypsum nucleation would
Charlar en LíneaFacile preparation of α-calcium sulfate hemihydrate whisker
2023.10.1 In the field of chemical industry, gypsum is commonly used as a raw material for the production of sulfuric acid, ammonium sulfate, calcium carbonate, and
Charlar en LíneaExperimental Study and Mechanism Analysis of Preparation of α-Calcium ...
2022.5.9 Abstract. Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum
Charlar en LíneaGypsum crystallization and hydrochloric acid ... - ScienceDirect
2009.3.1 Abstract. In this work, the crystallization of gypsum (CaSO 4 2H 2 O) in the temperature range of 20–60 °C is investigated along with the simultaneous regeneration
Charlar en LíneaGypsum crystallization and hydrochloric acid ... - ScienceDirect
2009.3.1 Calcium chloride (CaCl 2) solutions are produced in various chemical industries from geothermal brines to spent leach solutions after the leaching of ores with
Charlar en LíneaGypsum crystallization and hydrochloric acid ... - Semantic
2009.3.1 Semantic Scholar extracted view of "Gypsum crystallization and hydrochloric acid regeneration by reaction of calcium chloride solution with sulfuric acid"
Charlar en LíneaGypsum Crystallization and Hydrochloric Acid Regeneration
2009.3.1 Request PDF Gypsum Crystallization and Hydrochloric Acid Regeneration by Reaction of Calcium Chloride Solution with Sulfuric Acid In this work, the
Charlar en LíneaRecycling and utilization of calcium carbide slag
2022.5.1 Coal is the dominant fuel in China to provide primary energy, and 70% of polyvinyl chloride is produced from coal-based CaC 2.CaC 2 reacts with water to produce acetylene and calcium carbide slag (CCS) as a solid waste for polyvinyl chloride production. Approximate 40 million tons of dry CCS are generated annually in China, among which
Charlar en LíneaExperimental Study and Mechanism Analysis of Preparation of α-Calcium ...
2022.5.9 Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO42H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved
Charlar en LíneaFactorial analysis of nano-precipitated calcium carbonate via
2022.12.1 The precipitated calcium carbonate production implies producing slaked lime, Ca(OH) 2, from the Solvay wastewater synthesized solution. The aqueous solution was prepared by mixing calcium chloride (120 g/L) and sodium chloride (60 g/L) at a ratio of 2:1. The sample was prepared in a glass measuring flask with a total volume of 250 mL.
Charlar en LíneaGypsum Precipitation Kinetics and Solubility in the
2014.5.27 Crystallization of calcium sulfate dihydrate (CaSO42H2O, gypsum) in sodium chloride solutions has been studied in the presence of magnesium ion. It was shown that Mg2+ has an inhibiting effect on the two stages of precipitation: nucleation and growth. Kinetic results were explained on the basis of the strong effect of magnesium ions on
Charlar en LíneaFacile preparation of α-calcium sulfate hemihydrate whisker
2023.10.1 In the field of chemical industry, gypsum is commonly used as a raw material for the production of sulfuric acid, ammonium sulfate, calcium carbonate, and other chemicals containing sulfur or calcium. Furthermore, gypsum can undergo further processing to create materials with exceptional properties such as high-strength gypsum
Charlar en LíneaA review on chemical precipitation in carbon capture,
2022.10.22 The basicity of the by-product of flue gas desulfurization renders its potential in mineral carbonation. Gypsum (CaSO 4 2H 2 O) is a major industrial product produced in wet flue gas desulfurization . The high leachability of calcium from gypsum makes it ideal for carbon sequestration, direct or indirect.
Charlar en LíneaKinetics of the conversion reaction of gypsum with
2018.5.7 Gypsum (CaSO 4 2H 2 O) is a natural mineral. It is, however, also well known as a by-product (co-fertilizer material) of technologies producing phosphate fertilizers (Parrish and Ogilvie 1939; Kongshaug et al. 2000), technologies used for the production of TiO 2 (Gázquez et al. 2014), and others.From the “non-chemical” purposes, manufacture
Charlar en LíneaPreparation of alpha-calcium sulfate hemihydrate from FGD gypsum
2016.6.15 The phase-transition of FGD gypsum to α-HH was conducted in a chloride-free Ca(NO 3) 2 solution under atmosphere pressure. For an easy comparison between the chloride and the nitrate system, the Ca(NO 3) 2 concentration and reaction temperature were set to be 4.0 M and 95 °C, respectively, the same with those reported in the
Charlar en LíneaPreparation of α-calcium sulfate hemihydrate from
Request PDF On Nov 23, 2020, Qingjun Guan and others published Preparation of α-calcium sulfate hemihydrate from industrial by-product gypsum: A review Find, read and cite all the research ...
Charlar en LíneaExperimental Study and Mechanism Analysis of Preparation of α-Calcium ...
2022.5.9 Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO42H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved
Charlar en LíneaHydrochloric Acid Regeneration via Calcium Sulfate
For leaching processes that generate a spent calcium chloride solution ... “Gypsum Crystallization and Hydrochloric Acid Regeneration by Reaction of Calcium Chloride Solution with Sulfuric Acid,” Hydrometallurgy, 96 (2009), 95–102. CrossRef Google Scholar S. Girgin, and G. Demopoulos, “Production of the High Value Material ...
Charlar en LíneaGypsum crystallization and hydrochloric acid ... - Semantic
2009.3.1 DOI: 10.1016/J.HYDROMET.2008.08.010 Corpus ID: 95163301; Gypsum crystallization and hydrochloric acid regeneration by reaction of calcium chloride solution with sulfuric acid @article{AlOthman2009GypsumCA, title={Gypsum crystallization and hydrochloric acid regeneration by reaction of calcium chloride solution with sulfuric acid},
Charlar en LíneaEmission reduction process for dechlorinating flue‐gas desulfurization ...
2020.6.20 Thereafter, the desulfurization process can remove a portion of the trace elements from the flue gas 52, 84; chloride enters the FGD gypsum through this process. 85-87 Furthermore, Chang et al 88 found that the average chloride ion content in FGD gypsum can be as high as 1041.69 mg/L and that chlorine in FGD gypsum exists mainly
Charlar en LíneaPreparation of Nano-CaCO3 from Phosphogypsum by Gas–Liquid–Solid ...
2016.9.7 Calcium carbonate crystallization process from the mineralization of calcium chloride waste. Separation and Purification Technology 2023, 319 , 124066. ... A review of carbon dioxide sequestration by mineral carbonation of industrial byproduct gypsum. Journal of Cleaner Production 2021, 302 , 126930.
Charlar en LíneaGypsum crystallization and hydrochloric acid ... - ScienceDirect
2009.3.1 Calcium chloride (CaCl 2) solutions are produced in various chemical industries from geothermal brines to spent leach solutions after the leaching of ores with hydrochloric acid (HCl) and the employment of lime neutralization. Sulfuric acid, on the other hand, is a major by-product of the non-ferrous metallurgical industry.
Charlar en LíneaCONVERSION OF PHOSPHOGYPSUM TO POTASSIUM
2023.11.3 ity of gypsum in 0–30 mass% nitric acid solutions at 20°C was also studied [18]. The solubility of calcium sulfate dehydrate in HCl-CaCl 2 solutions was determined by Li and Demopoulos [19].
Charlar en LíneaCalcium Chloride - an overview ScienceDirect Topics
Calcium chloride can be injected as intravenous therapy for the treatment of “hypocalcemia” (low serum calcium). It can be used for insect bites or stings (such as Black Widow spider bites), sensitivity reactions, particularly when characterized by “urticaria” (hives). It has also been used in the treatment of: •.
Charlar en LíneaPreparation of α-calcium sulfate hemihydrate from FGD gypsum
2009.7.1 To prepare α-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) byproduct under atmospheric pressure, the dehydration of FGD gypsum in a concentrated Ca and Mg chlorides solution medium at 95 °C was investigated, and the effects of K + ions were focused on. The crystal water content variation, material
Charlar en LíneaExperimental Investigation of the Effects of Synthesis
2020.1.6 Calcium sulfate dihydrate (CaSO 4 2H 2 O) is the main content of phosphogypsum (PG) during the industrial wet process of manufacturing phosphoric acid. PG also contains various soluble and insoluble impurities, which present in the natural phosphate rock used in the H 3 PO 4 manufacturing process. However, some of these
Charlar en LíneaCO2 mineralization of carbide slag for the production of light calcium ...
2022.3.1 The production of polyvinyl chloride by calcium carbide method is a typical chemical process with high coal consumption, leading to massive flue gas and carbide slag emissions. ... As a raw material for PVC production, calcium carbide can be generated by high temperature ... [17], [18], desulfurized gypsum [19], [20], [21], high calcium fly ash ...
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