METHOD OF PRODUCTION OF HYDRATED TRICALCIUM ALUMINATE Russian patent published in 2006 - IPC C01F7/16 

FIELD: non-ferrous metallurgy; production of alumina for making coarse-crystalline hydrated tricalcium aluminate from industrial solutions.

SUBSTANCE: proposed method includes production of hydrated tricalcium aluminate from undustrial aluminate solutions containing NaCl, Na₂CO₃ and Na₂SO₄ salts. Proposed method includes also treatment of alkaline aluminate solution with lime milk to ratio by mass between Al₂O₃:CaO equal to 1: (1-1.6). Mixture thus obtained is mixed and finished product is separated. Concentration of lime in lime milk (in terms of CaO) is equal to 50-205 g/l at temperature of 85-97°C; rate of supply of lime milk to heated alkaline aluminate solution shall not exceed 70 l/min per cubic meter of alkaline aluminate solution.

EFFECT: enhanced efficiency.

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