Method for the obtention of special alumina from the powder...

Details Method for the obtention of special alumina from the powder... Method for the obtention of special alumina from the powder...

C - Chemistry, Metallurgy

01

F

23/247

C01F 7/02 (2006.01) C01F 7/44 (2006.01) C01F 7/46 (2006.01)

Patent

CA 1288213

ABSTRACT The process for the manufacture of special aluminas from the powder produced in the calcination of alumina hydrate, as proposed by the invention, achieves the recovery of this by-product, treating it separatedly from the rest of the alumi na, in order to convert it into special alumina of high calci- nation degree, or alpha alumina, being adequate for uses other than aluminum production. The process is carried out by submit ting the by-product to a water-washing stage that reduces its so dium content, solid and liquid separation, filtering and dry- ing. A drying operation is finally carried out with a calcina- tion at a high temperature wherein the alumina of high calcina tion degree is transformed into alpha alumina.

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