Recovery of alkali values from salt-containing trona deposits
Patent 4401635 Issued on August 30, 1983. Estimated Expiration Date: 
January 19, 2001. 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.
January 19, 2001. 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 ReferencesInventorApplicationNo. 06/226288 filed on 01/19/1981US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds299/5, Dissolving or chemical reaction423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassesE21B 43/34 (20060101)E21B 43/00 (20060101) E21B 43/28 (20060101) E21B 43/40 (20060101) C01D 7/00 (20060101) C22B 26/00 (20060101) C22B 26/10 (20060101) AbstractA 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.Other References
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