Recovery of soda values from sodium carbonate crystallizer purge liquors
Patent 3991160 Issued on November 9, 1976. Estimated Expiration Date: 
November 9, 1993. 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.
November 9, 1993. 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 3869538 3870780 InventorsAssigneeApplicationNo. 587581 filed on 06/17/1975US Classes:423/184, Forming insoluble substance in liquid423/206.2, Alkali carbonate from trona423/207, Burning the impurity423/208, Water leaching or forming water soluble substance423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. Attorney, Agent or FirmAbstractSoda values from the crystallizer mother liquor purge in the process of making sodium carbonate from trona are recovered by (1) mixing the purge with treating agent of magnesium oxide, aluminum oxide, bauxite, certain fine particle size calcined trona, insoluble impurities obtained in the trona-soda ash process, or mixtures thereof, (2) evaporating the resulting mixture to dryness and calcining it to insolubilize soluble silicates and to reduce contamination with carbonaceous impurities, and (3) leaching the calcined mixture with water or aqueous sodium carbonate solution. |
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