Cyclic solution mining of borate ores
US4475771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1983 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Mar 28, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of recovering boric acid from a subterranean deposit of colemanite ore by solution mining, comprises: PA0 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; PA0 withdrawing the pregnant solution of boric acid and calcium chloride from said deposit via a production well in communication therewith; PA0 separating boric acid from the withdrawn solution; PA0 adding sulfuric acid to the resultant concentrated solution from which boric acid has been separated, whereby hydrochloric acid is regenerated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; PA0 separating CaSO.sub.4.2H.sub.2 O from the resultant solution containing regenerated hydrochloric acid thereby forming a regenerated leach solution; and PA0 recycling the regenerated leach solution to the subterranean deposit of colemanite via an injection well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.