84827 ⎘
Phosphorus; Compounds thereof; Oxyacids of phosphorus; Salts thereof; Phosphoric acid; Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it , e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form Dihydrate-anhydrite or hemihydrate-anhydrite process