Process for extracting alumina from aluminous ores

Details Process for extracting alumina from aluminous ores Process for extracting alumina from aluminous ores

C - Chemistry, Metallurgy

01

F

53/236, 23/246

C01F 7/06 (2006.01) C01F 7/46 (2006.01) C01F 7/47 (2006.01)

Patent

CA 1179149

Abstract of the Disclosure In the production of alumina from aluminous ores containing alumina trihydrate and alumina monohydrate comprising a first-stage digestion of by digesting alumina trihydrate from a slurry of the ores and a caustic solution and separating the resulting slurry into a caustic alumi- nate solution and an insoluble residue, and a second-stage digestion of by digesting alumina monohydrate from a slurry of the insoluble residue separated in the first- stage digestion and a caustic solution, the present invention provides an improvement wherein scales formation onto a preheater for the slurry in the second-stage diges- tion is completely or substantially prevented and reduction in heat transfer coefficient of heat transfer surface is remarkably lowered, attains by setting up a desilica- tion reaction zone in the course of the first-stage digestion, whereby the slurry introduced into said zone is subjected to desilication reaction treatment.

396966

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