Gypsum is also calcium silicon material

In particular, gypsum also be included in the calcium granules material.
Gypsum calcium Calculated: Laboratory Gypsum we calculated a substantially sulfur trioxide, calculate the content of CaSO4, the content of dihydrate gypsum, and the content of CaO (Ca according SO3: 40, O: 16, H: 1, S: 32).
SO3 molar mass of 32 +16 * 3 = 80g/mol; (S to 32, O to 16); CaO molar mass of 56g/mol; (Ca to 40, O to 16); CaSO4 molar mass = 56 +80 136g/mol (written CaO · SO3); CaSO4 · 2H2O: water molar mass of 18, the molar mass of blast grit 172g/mol.
Then when a single laboratory out phosphogypsum SO3 content of 30% of the time, CaO content = 30% * 56/80 = 21%, CaSO4 content of 30% +21% = 51%, the content of gypsum dihydrate = 30 % * 172/80 = 64.5%