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 desulfurized gypsum which is widely used in building materials and other industries Its processing and utilization are of great significance
·The carbonate minerals and gypsum exert a dominating influence on soils inwhich they are present because of their relatively high solubility and in the caseof the carbonates their alkalinity and
·To avoid the long term pollution of land and water by industrial gypsum by products the exploitation of this resource has become a priority The indirect synthesis of calcium carbonate from the industrial by product gypsum has received substantial attention as a viable method for resource utilization Currently the primary problems in the indirect manufacture of
·Usually the raw material for the preparation of calcium sulfate whiskers is natural gypsum but natural gypsum is a non renewable resource with decreasing natural reserves and the organic acid can remove the calcium carbonate from CDA The removal process conditions are the temperature of 60 °C the time of 5 min the initial solid
·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
·Desulfurized ash contains about % hemihydrate calcium sulfite % calcium carbonate % dihydrate gypsum % calcium hydroxide % calcium oxide Particle size distributions of hemi hydrate gypsum and desulfurized ash are given in Fig 1 A The specific surface areas of desulfurized ash and hemihydrate gypsum are 351 and
particle size Since desulfurized gypsum contains water with a mass fraction of about 10% it also contains impurities such as fly ash organic carbon calcium carbonate calcium sulfite and soluble salts composed of sodium potassium magnesium sulphate or chloride Therefore the application of desulfurized gypsum is
The semi hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board wallboard [107] The modified treatment of desulfurized gypsum with cement inorganic waste straw fiber and other wastes can be used to manufacture high insulation and compression resistant wall materials [108] Desulfurized gypsum is incorporated into the
·Semantic Scholar extracted view of "A novel resource utilization of the calcium based semi dry flue gas desulfurization ash As a reductant to remove chromium and vanadium from vanadium industrial wastewater " by D Fang et al The removal of high concentration flue gas sulfur dioxide SO2 using manganese carbonate ore desulfurization MCO
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