Process for the preparation of boric acid from colemanite and/or howlite minerals
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United States of America Patent
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Feb 14, 1989
Issued Date -
N/A
app pub date -
Mar 16, 1988
filing date -
Jan 29, 1986
priority date (Note) -
Expired
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Abstract
A process for the preparation of boric acid from colemanite and/or howlite minerals basically comprising: treating the mineral with sulfuric acid in order to dissolve boron compounds from the minerals; separating a solution formed by the chemical reaction, from the solids in suspension; reacting said solution with hydrogen sulfide in order to precipitate arsenic and iron impurities contained in the solution; separating the impurities precipitated from the remaining solution; reacting said remaining solution with ammonia so as to precipitate aluminum impurities; separating said aluminum impurities form the remaining solution; reacting the latter with hot sulfuric acid in order to generate boric acid; cooling the reaction mixture in order to precipitate the boric acid; and separating the boric acid from the remaining solution, being the latter susceptible to be recycled to the sulfuric acid treatment stage in order to concentrate the mineral. Also regeneration of ammonia is achieved so as to be used again in the process.
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