Cyclic solution mining of borate ores
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United States of America Patent
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Oct 9, 1984
Grant Date -
N/A
app pub date -
Mar 28, 1983
filing date -
Mar 28, 1983
priority date (Note) -
Expired
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Abstract
A method of recovering boric acid from a subterranean deposit of colemanite ore by solution mining, comprises: supplying a leach solution comprising hydrochloric acid to the subterranean deposit via an injection well in communication therewith, whereby colemanite ore is dissolved and an aqueous pregnant solution of boric acid and calcium chloride is formed in the deposit; withdrawing the pregnant solution of boric acid and calcium chloride from said deposit via a production well in communication therewith; separating boric acid from the withdrawn solution; adding sulfuric acid to the resultant concentrated solution from which boric acid has been separated, whereby hydrochloric acid is regenerated therein and CaSO.sub.4.2H.sub.2 O is formed; separating CaSO.sub.4.2H.sub.2 O from the resultant solution containing regenerated hydrochloric acid thereby forming a regenerated leach solution; and recycling the regenerated leach solution to the subterranean deposit of colemanite via an injection well.
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