A crystallization method of gypsum
AssigneeTokuyama Corporation
InventorShingo HIRANAKA
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Abstract
Wasted gypsum boards are crushed and calcined to gypsum granular solid, and the gypsum granular solid is mixed with water to form gypsum slurry. Gypsum particles are deposited from the gypsum slurry in a crystallization tank. Heated steam is blown into the gypsum slurry at a height from surface of the gypsum slurry and down to upper ⅕ of the gypsum slurry to heat the gypsum slurry and to eliminate foam on the gypsum slurry.
Claims4
A crystallization method of gypsum comprising a step for crushing and calcining wasted gypsum boards to gypsum granular solid and a step for mixing the gypsum granular solid with water to form gypsum slurry and depositing gypsum particles from the gypsum slurry in at least a crystallization tank,
- wherein heated steam is blown into the gypsum slurry at a height from the surface of the gypsum slurry and down to upper ⅕ of the gypsum slurry, the gypsum slurry is heated by the heated steam, and foam on the gypsum slurry is eliminated by the heated steam.
Dependencies are inferred from the claim text.