Solution mining of trona or nahcolite ore with aqueous NaOH and HCl solvents
US4498706A · kind A · utility
46Cited by
5References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 15, 1983 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Aug 15, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C41/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Separate deposits of trona or nahcolite ore are solution mined with two solvents, aqueous sodium hydroxide and aqueous hydrogen chloride. Aqueous sodium carbonate solution is withdrawn from the region of the NaOH-treated ore deposit, for recovery of soda ash. Aqueous sodium chloride brine is withdrawn from the region of the HCl-treated ore deposit and introduced to an electrodialysis cell to regenerate the two solvents and thereby continue the solution mining cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.