Recovery of alkali values from salt-containing trona deposits
US4401635A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Jan 19, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C41/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for recovering alkali values from subterranean deposits of trona ore associated with sodium chloride by contacting the trona with an aqueous mining solution containing sodium hydroxide and subsequently utilizing the alkali values contained in the resultant salt- and sodium carbonate-containing solution. The alkali values are preferably crystallized as substantially salt-free sodium carbonate monohydrate, which is dried to recover soda ash. The mother liquor containing all of the salt is then treated to prepare a dilute sodium hydroxide solution, which may be employed as aqueous mining solution in a cyclic method to recover additional alkali values from trona.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.