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Selective flotation of phosphate minerals with hydroxamate collectors

United States Patent

6,341,697
January 29, 2002
View the Complete Patent at the US Patent & Trademark Office
A method is disclosed for separating phosphate minerals from a mineral mixture, particularly from high-dolomite containing phosphate ores. The method involves conditioning the mineral mixture by contacting in an aqueous in environment with a collector in an amount sufficient for promoting flotation of phosphate minerals. The collector is a hydroxamate compound of the formula; ##STR1## wherein R is generally hydrophobic and chosen such that the collector has solubility or dispersion properties it can be distributed in the mineral mixture, typically an alkyl, aryl, or alkylaryl group having 6 to 18 carbon atoms. M is a cation, typically hydrogen, an alkali metal or an alkaline earth metal. Preferably, the collector also comprises an alcohol of the formula, wherein R' is generally hydrophobic and chosen such that the collector has solubility or dispersion properties so that it can be distributed in the mineral mixture, typically an alkyl, aryl, or alkylaryl group having 6 to 18 carbon atoms.
Miller; Jan D. (Salt Lake City, UT), Wang; Xuming (Salt Lake City, UT), Li; Minhua (Salt Lake City, UT)
University of Utah Research Foundation (Salt Lake City, UT)
09/ 699,967
October 30, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was supported in part by contract number DOE (DE-FG-03-93 ER14315) from the Department of Energy (DOE). The Government has certain rights in the invention.