Method for separating mixture of finely divided minerals
Patent 5535890 Issued on July 16, 1996. Estimated Expiration Date: 
December 7, 2014. 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.
December 7, 2014. 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 2990958 3138550 3371988 3670883 3701417 3837482 3857781 3862027 Selective rheological separation of clays Froth flotation apparatus and process InventorsAssigneeApplicationNo. 350913 filed on 12/07/1994US Classes:209/5Deflocculation and flocculationExaminersPrimary: Terrell, William E.Assistant: Milef, Boris Foreign Patent References
International ClassB03B 001/00AbstractThis invention relates to a process for separating a mixture of finely divided minerals into constituents thereof. In particular, the invention relates to a procedure for effecting such separation by a novel selective flocculation technique wherein a dispersed aqueous pulp containing the mixture of minerals is preconditioned for selective flocculation with an anionic polymer by addition of both a fatty acid such as oleic acid and source of polyvalent cation such as calcium chloride. The fatty acid and cation of the salt selectively coat the component of the mixture that is subsequently flocculated with the anionic polymer. A polyacrylate salt dispersant is preferably used in the process. The invention is especially adapted to the separation of colored titaniferous impurities from kaolin clay.Other References
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