Continuous production of lithium carbonate
Patent 4124684 Issued on November 7, 1978. Estimated Expiration Date: 
August 9, 1997. 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.
August 9, 1997. 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 2331838 3073673 3112170 3112171 InventorsAssigneeApplicationNo. 05/823143 filed on 08/09/1977US Classes:423/179.5LithiumExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. Attorney, Agent or FirmInternational ClassesC01D 15/00 (20060101)C01D 15/08 (20060101) Foreign Application Priority Data1976-08-10 GBAbstractLithium carbonate is derived from a calcined lithium-bearing silicate in a continuous cyclic process in which the silicate is decomposed in aqueous medium with sodium carbonate at a selected temperature and pressure, the resulting slurry is cooled and leached with carbon dioxide, and the resulting lithium bicarbonate-bearing soluton is heated to derive lithium carbonate and a mother liquor, which is recycled to the decomposition step. The amount of aqueous liquid used in the decomposition step is reduced to a minimum and the leaching accomplished without further dilution. This results in contamination of the recycled mother liquor with bicarbonate ions, which normally act to inhibit a high yield of lithium carbonate. The process conditions are controlled to reduce this inhibiting effect. Preferably, this control is effected by selecting a relatively low reaction temperature accompanied by neutralizing the mother liquor. Less desirably, the control is effected by selecting a relatively higher temperature and regulating it closely.Other References
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