Process for the production of alumina

Details Process for the production of alumina Process for the production of alumina

1982-05-03

1985-07-02

Carter, H. T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423114, 423122, 423128, C01F 726

Patent

active

045267634

ABSTRACT:
In a process for the production of alumina from aluminous raw material, an ammonoalunite intermediate is formed. The raw material is preferably a clay which is leached with sulfuric acid to form an aluminous solution which is separated from the solid materials. After any required extraction of iron, such as by liquid ion exchange, the solution is subjected to elevated temperatures and pressures in the presence of ammonium ions to form ammonoalunite which is recovered as a precipitate. The liquor is recycled to leach the clay, while the ammonoalunite is thermally decomposed to alumina. Gases liberated during decomposition are scrubbed with recycled liquor to form clay leach liquor. The alumina may be purified by washing with sulfuric acid to obtain a purity suitable for aluminum electrolysis.

REFERENCES:
patent: 1752641 (1930-04-01), Kjellgren
patent: 1948888 (1934-02-01), Sanders
patent: 1960320 (1934-05-01), Steuart
patent: 2354133 (1944-07-01), Lyons
patent: 2467271 (1949-04-01), Peer
patent: 3226187 (1965-12-01), Bretsznajder et al.
patent: 3320032 (1967-05-01), Feller
patent: 4377566 (1983-03-01), Bachelard et al.

Affiliated with

Also associated with

Rating

Process for the production of alumina does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of alumina, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of alumina will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-380648