C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/246
C01F 7/06 (2006.01)
Patent
CA 1080439
PROCESS FOR EXTRACTING ALUMINA FROM ALUMINA-CONTAINING ORES ABSTRACT OF THE DISCLOSURE In a process for extracting alumina from alumina-containing ores on a two-stream system by individually preheating a slurry of alumina-containing ores and an aqueous alkali solution each in preheaters of indirectly heating, mixing the preheated slurry with the preheated aqueous alkali solution, and extracting alumina from the ores in a digester of heating type of direct injection of live steam or heat-insulated type, the alumina is extracted from the ores by preparing the slurry of alumina-containing ores with water or a diluted aqueous alkali solution, particularly drain obtained by recovering steam from an evaporator for cooling slurry resulting from extraction, and utilizing the recovered steam in preheating the slurry of alumina-containing ores or decomposition solution or both, preheating the slurry of alumina-containing ores, and mixing the preheated slurry with an aqueous alkali solution pre- heated as another stream as the decomposition solution. Scale formation can be prevented completely or substantial- ly on an inside surface of the preheater for the slurry of alumina-containing ores.
284220
Harato Takuo
Ishida Takahiro
Shiozaki Yasumi
Yamada Koichi
LandOfFree
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