Process for the obtainment of boric acid from colemanite and/or howlite minerals
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United States of America Patent
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Jul 12, 1988
Grant Date -
N/A
app pub date -
Jan 29, 1987
filing date -
Jan 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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