Solution mining of trona or nahcolite ore with electrodialytically-produced aqueous sodium hydroxide
April 16, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3184287 Process for the solution mining of subterranean sodium bicarbonate bearing ore bodies Method for removal of SO2 from gases Bipolar membranes and method of making same Electrodialytic process Electrodialytic process for the conversion of impure soda values to sodium hydroxide and carbon dioxide Preparing alkali metal hydroxide by water splitting and hydrolysis Solution mining of trona or nahcolite ore with aqueous NaOH and HCl solvents Process for recovering sodium carbonate from trona and other mixtures of sodium carbonate and sodium bicarbonate Patent #: 4584077 InventorsAssigneeApplicationNo. 06/723679 filed on 04/16/1985US Classes:299/5, Dissolving or chemical reaction204/534, And using bipolar membrane423/206.2, Alkali carbonate from trona423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Kaplan, G. L.Attorney, Agent or FirmInternational ClassesC22B 26/10 (20060101)C22B 26/00 (20060101) B01D 61/42 (20060101) B01D 61/44 (20060101) E21B 43/34 (20060101) E21B 43/40 (20060101) E21B 43/00 (20060101) E21B 43/28 (20060101) AbstractA cyclic solution mining method that uses aqueous sodium hydroxide for recovering valuable alkali values, preferably as soda ash, from subterranean deposits of trona or nahcolite, even when such deposits are NaCl-contaminated. The aqueous sodium hydroxide mining solvent is generated via electrodialysis of a recirculating sodium chloride brine stream. Hydrogen chloride that is also generated in the cell's operation is neutralized with aqueous sodium carbonate, to regenerate sodium chloride brine that is recirculated to the electrodialysis cell as brine feed. |
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