Process for refining kaolin
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Jul 29, 1991
filing date -
Mar 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is disclosed for producing high brightness kaolin from ore containing silica, other types of clays, minerals such as ilmenite micas, feldspars and various metal silicates as well as organic matter. The process consists of sizing, a double floatation step, magnetic separation, leaching and oxidative brightening steps. This is a novel combination of conventional unit operations and in particular the use of a double floatation step to remove quartz and various trace minerals that interfere with achieving high optical brightness for kaolin.
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