Purification of kaolin clay by froth flotation using hydroxamate collectors
AssigneeThiele Kaolin Company
InventorsRoe-Hoan Yoon, Thomas M. Hilderbrand
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Abstract
An 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.
Claims11
In a method for removing anatase impurities from a kaolin clay wherein the impure clay in aqueous suspension is first conditioned by treatment with a collector in an amount sufficient for promoting flotation of said impurities and then subjected to froth flotation for removal of said impurities for said clay,
- the improvement comprising using as said collector a compound having the formula ##STR3## wherein R is an alkyl, aryl, or alkylaryl group having 4-28 carbon atoms and M is hydrogen, an alkali metal, or an alkaline earth metal, said suspension having a pH above 6.
Dependencies are inferred from the claim text.