Purification of kaolin clay by froth flotation using hydroxamate collectors
Patent 4629556 Issued on December 16, 1986. Estimated Expiration Date: 
November 29, 2004. 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 29, 2004. 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 3432030 3438494 3450257 Process for rutile flotation by means of N-benzoyl-N-phenylhydroxylamine as a selective collector Method of treating clay to improve its whiteness Patent #: 4492628 InventorsAssigneeApplicationNo. 06/676477 filed on 11/29/1984US Classes:209/166, With modifying agents252/61Froth-flotation or differential adherenceExaminersPrimary: Nozick, BernardAttorney, Agent or FirmInternational ClassesB03D 1/01 (20060101)B03D 1/00 (20060101) B03D 1/004 (20060101) B03D 1/02 (20060101) AbstractAn improved flotation process for removal of colored titaniferous impurities from kaolin clay uses as collector a hydroxamate compound, or a mixture of compounds, having the formula ##STR1## in which R is an alkyl, aryl, or alkylaryl group having 4-28, and preferably 6-24 carbon atoms, and M represents an alkali metal, an alkaline earth metal or hydrogen. The process does not require the use of activators to make the collector adsorb selectively on the colored impurities.Other References
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