Chemistry of inorganic compounds – Boron or compound thereof – Oxygen containing
Patent
1987-01-29
1988-07-12
Garvin, Patrick P.
Chemistry of inorganic compounds
Boron or compound thereof
Oxygen containing
75 2, 423277, 423283, C01B 3512
Patent
active
047568941
ABSTRACT:
Improved process for obtaining boric acid from colemanite and/or howlite minerals basically comprising the stages of: treating the mineral with sulfuric acid to dissolve boron compounds; separating a solution thus formed from the solids in suspension; reacting said solution with hydrogen sulfide to precipitate arsenic and iron impurities precipitated from the remaining solution; cooling the remaining solution to precipitate boric acid; and separating the boric acid from the formed suspension. The liquor produced is free from impurities and before cooling can be recycled to the stage where the mineral is treated with sulfuric acid in order to concentrate the mineral. Likewise, the liquor obtained after precipitation of boric acid can also be recycled to said stage in order to concentrate the solution.
REFERENCES:
patent: 289836 (1883-12-01), Hobson
patent: 1927013 (1933-09-01), Cramer et al.
patent: 2855276 (1958-10-01), May et al.
Garvin Patrick P.
Materias Primas Magdalena S.A.DE C.V.
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