Process for the production of purified, synthetic calcium borate

Details Process for the production of purified, synthetic calcium borate Process for the production of purified, synthetic calcium borate

1995-03-01

1999-02-09

Langel, Wayne

Chemistry of inorganic compounds

Boron or compound thereof

Oxygen containing

423283, C01B 3510, C01B 3512

Patent

active

058690140

ABSTRACT:
A process for the production of calcium borate from boric acid; boric acid, obtained from any source, is reacted with a calcium compound, preferably calcium hydroxide, in an aqueous medium to obtain a suspension of solid calcium borate which is then separated from the residual liquor. Preferably the boric acid is prepared from minerals containing borate salts, in particular, colemanite and howlite; wherein said minerals are ground, reacted with sulfuric acid in an aqueous medium, at high temperature, to obtain a pulp of solids, including mainly gypsum and clay, in a liquor; said solids are eliminated from the liquor and boric acid is crystallized.

REFERENCES:
patent: 1927013 (1933-09-01), Cramer et al.
patent: 1927014 (1933-09-01), Cramer et al.
patent: 4086325 (1978-04-01), Cordier et al.
patent: 4270944 (1981-06-01), Eastes et al.
patent: 5084260 (1992-01-01), Bertocci et al.
patent: 5472678 (1995-12-01), Nie et al.

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