Method for the obtention of an especial alumina from the powder

Details Method for the obtention of an especial alumina from the powder Method for the obtention of an especial alumina from the powder

1987-09-03

1989-01-10

Lechert, Jr., Stephen J.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423628, 423630, 423631, 423DIG15, 241 25, 241 27, 264125, C01F 702

Patent

active

047972700

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 alumina, in order to convert it into special alumina of high calcination degree, or alpha alumina, being adequate for uses other than aluminum production. The process is carried out by submitting the by-product to a water-washing stage that reduces its sodium content, solid and liquid separation, filtering and drying. A drying operation is finally carried out with a calcination at a high temperature wherein the alumina of high calcination degree is transformed into alpha alumina.

REFERENCES:
patent: 4477427 (1984-10-01), Matyasi et al.
patent: 4615875 (1986-10-01), Gonczy et al.
patent: 4634581 (1987-01-01), Cambridge et al.

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