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US 12,410,095 B2Granted
Crystallization method of gypsum
AssigneeTokuyama Corporation
InventorShingo Hiranaka
Life of this patent
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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.
Claims5
A method of reclaiming gypsum particles from wasted gypsum boards, the method comprising:
- crushing and calcining wasted gypsum boards to gypsum granular solid,
- mixing the gypsum granular solid with water to form gypsum slurry in a mixing tank,
- generating gypsum particles in the gypsum slurry in at least a crystallization tank wherein surfactants from the wasted gypsum boards cause foam on the gypsum slurry, and
- blowing heated steam into the gypsum slurry in the crystallization tank at a height between a top surface of the gypsum slurry and ⅕ below the top surface of the gypsum slurry so that the gypsum slurry is heated only by the heated steam, and the foam on the gypsum slurry is eliminated by the heated steam.
1 more element
Dependencies are inferred from the claim text.