Recovery of alkali values from trona ore
Patent 4285915 Issued on August 25, 1981. Estimated Expiration Date: 
April 23, 2000. 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.
April 23, 2000. 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 ReferencesInventorsAssigneeApplicationNo. 06/142918 filed on 04/23/1980US 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 ClassesC01B 17/16 (20060101)C01B 17/22 (20060101) C01B 17/00 (20060101) C01D 7/00 (20060101) C22B 26/00 (20060101) C22B 26/10 (20060101) AbstractAlkali values are recovered in a cyclic method from mechanically mined trona ore or from trona deposits by a solution mining technique utilizing a solvent comprising an aqueous solution of sodium sulfide. The ore is solubilized as sodium carbonate which is precipitated as sodium sesquicarbonate and/or sodium bicarbonate by treating the solution with hydrogen sulfide and the precipitated salt separated from the mother liquor. In the process, sodium sulfide and hydrogen sulfide become converted into sodium hydrosulfide which is contained in the mother liquor. Heat treatment of the mother liquor converts the sodium hydrosulfide into sodium sulfide thereby regenerating a solution of sodium sulfide which is recycled to the trona ore and into hydrogen sulfide which is evolved and recycled to the sodium carbonate solution. |
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