High specific surface hydrargillite

Details High specific surface hydrargillite High specific surface hydrargillite

1985-03-04

1986-09-16

Carter, H. T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423625, 423629, C01F 702

Patent

active

046121846

ABSTRACT:
A high specific surface hydrargillite, well adopted as filler material or primer particulates in the production of finely divided aluminum trihydroxide by decomposition of Bayer process aluminate liquors, is readily prepared by (i) reacting an alkali metal aluminate with hydrofluoric acid at a temperature ranging from about 5.degree. to 95.degree. C., the amount of said hydrofluoric acid ranging from about 25% to 90% of that amount stoichiometrically required for complete neutralization of the alkalinity of said aluminate, (ii) optionally treating the hydrargillite precipitate which results at a temperature of from about 5.degree. to 95.degree. C. for from about one-half to 10 hours, and thence (iii) recovering said hydrargillite precipitate, preferably by filtering, washing and drying.

REFERENCES:
patent: 3385663 (1968-05-01), Hughes
patent: 3411876 (1968-11-01), Michel et al.
patent: 3411877 (1968-11-01), Michel et al.
patent: 4217337 (1980-08-01), Yamada et al.

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