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Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related hydrates. In the form of γ- anhydrite (the anhydrous form), it is used as a desiccant . One particular hydrate is better known as plaster of Paris , and another occurs naturally as the mineral gypsum .
calcium perrhenate: 13768–54–2 CaS: calcium sulfide: 20548–54–3 CaSO 4: calcium sulfate: 7778–18–9 CaSe: calcium selenide: 1305–84–6 CaSiO 3: calcium metasilicate: 1344–95–2 CaSi 2: calcium silicide: 12013–56–8 CaTe: calcium telluride: 12013–57–9 CaTiO 3: calcium titanate: 12049–50–2 CaWO 4: calcium tungstate ...
Calcium sulfide is the chemical compound with the formula Ca S. This white material crystallizes in cubes like rock salt. This white material crystallizes in cubes like rock salt. CaS has been studied as a component in a process that would recycle gypsum , a product of flue-gas desulfurization .
This transformation is reversible, with gypsum or calcium sulfate hemihydrate forming anhydrite by heating to around 200 °C (400 °F) under normal atmospheric conditions. [6] Anhydrite is commonly associated with calcite, halite, and sulfides such as galena, chalcopyrite, molybdenite, and pyrite in vein deposits.
Calcium sulfite, or calcium sulphite, is a chemical compound, the calcium salt of sulfite with the formula CaSO 3 ·x(H 2 O). Two crystalline forms are known, the hemihydrate and the tetrahydrate, respectively CaSO 3 ·½(H 2 O) and CaSO 3 ·4(H 2 O). [2] All forms are white solids. It is most notable as the product of flue-gas desulfurization.
The production of sulfuric acid from anhydrous calcium sulfate produces calcium silicates. [9] Upon being mixed with shale or marl, and roasted at 1400 °C, the sulfate liberates sulfur dioxide gas, a precursor to sulfuric acid. The resulting calcium silicate is used in cement clinker production. [10] 2 CaSO 4 + 2 SiO 2 + C → 2 CaSiO 3 + 2 SO ...