Recovery of alkali values from sodium bicarbonate-containing ore with ammonia
Patent 4283372 Issued on August 11, 1981. Estimated Expiration Date: 
January 29, 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.
January 29, 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. 06/116511 filed on 01/29/1980US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds299/5, Dissolving or chemical reaction423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/425, Sesquicarbonate423/427By reacting a bicarbonateExaminersPrimary: Thomas, Earl C.Assistant: Straub, Gary P. Attorney, Agent or FirmInternational ClassesC22B 26/00 (20060101)C22B 26/10 (20060101) AbstractA method for recovering alkali value from sodium bicarbonate-containing ore by utilizing an aqueous solvent containing ammonia. The aqueous ammonia solvent is contacted with the ore to solubilize the sodium bicarbonate-containing ore. The alkali values in the resulting solution are crystallized, preferably as sodium carbonate monohydrate or as sodium sesquicarbonate, which may be processed to recover soda ash. Aqueous ammonia solvent is preferably regenerated from the mother liquor remaining after recovery of the solids, the ammonia solvent then being employed in a cyclic method to recover additional alkali values from the ore.Other References
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