Method of treating alumina trihydrate containing bauxite of low

Details Method of treating alumina trihydrate containing bauxite of low Method of treating alumina trihydrate containing bauxite of low

1996-03-29

1997-08-05

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423600, C01F 700

Patent

active

056539479

ABSTRACT:
The present invention is a method for producing alumina trihydrate with a low silica content from Gibbsite-containing bauxite of low reactive silica content. The present method involves two desilication steps: one step before extraction of alumina from the bauxite, i.e., a pre-desilication, and an additional desilication step following alumina extraction, i.e., a post-desilication. The present method comprises the steps of:
(a) heating a suspension of ground bauxite in an aqueous solution comprising sodium hydroxide at a temperature greater than 80.degree. C.; and
(b) increasing the sodium hydroxide concentration of the suspension from (a); and
(c) heating the suspension from (b) at a temperature greater than 80.degree. C.; and
(d) diluting the suspension from (c) with an aqueous solution; and
(e) heating the suspension from (d) at a temperature greater than 80.degree. C., affording a suspension comprising a supersaturated, desilicated sodium aluminate liquor and insoluble solid.

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patent: 4650653 (1987-03-01), Lepetit et al.
patent: 4994244 (1991-02-01), Fulford et al.
patent: 5163973 (1992-11-01), Ellis

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