Soda ash production
Patent 5238664 Issued on August 24, 1993. Estimated Expiration Date: 
June 27, 2011. 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.
June 27, 2011. 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 3050290 3655331 3792902 Treatment of sodium carbonate crystallizer mother liquors Recovery of soda values from sodium carbonate crystallizer purge liquors Recovery of alkali values from trona ore Recovery of alkali values from trona deposits Recovery of alkali values from salt-containing trona deposits Soda ash production Patent #: 5043149 InventorsAssigneeApplicationNo. 722031 filed on 06/27/1991US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds299/5, Dissolving or chemical reaction423/183, Hydroxide solution423/208, Water leaching or forming water soluble substance423/209, Carbonating423/419.1Carbonate or bicarbonateExaminersPrimary: Morris, TheodoreAssistant: Squillante, Edward Attorney, Agent or FirmForeign Patent References
International ClassC22B 026/10AbstractProcess for disposing of insoluble tailings that remain when solubilizing uncalcined or calcined trona in the process of producing soda ash, in which the tailings are slurried with water or waste solutions of sodium carbonate and/or sodium bicarbonate, adding an alkali metal hydroxide or alkaline earth metal hydroxide in effective amounts up to about 10% by weight of the aqueous slurrying solution, pumping the slurry into a well connected to an underground mined-out cavity with sufficient pressure to prevent build-up of tailings from plugging the bottom of the well opening, dispersing and settling said tailings in the cavity, removing a liquor from said cavity whose concentration of sodium carbonate and/or sodium bicarbonate has been increased and recovering such enriched liquor for use in the manufacture of sodium-containing chemicals such as soda ash.Other References
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