Scour medium for titanium dioxide production
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United States of America Patent
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Issued Date -
Mar 29, 2007
app pub date -
Sep 26, 2005
filing date -
Sep 26, 2005
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Abandoned
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Abstract
A blend of anatase and rutile titanium dioxides is calcined to a crush strength and density meeting the requirements for an acceptable scour medium in a chloride process for producing rutile titanium dioxide pigments. By using such a blend, a greater conversion of the anatase titanium dioxide can be realized than would be observed under the same calcination conditions were only anatase titanium dioxide calcined, so that a significant proportion of the less costly and less valuable anatase titanium dioxide can be used and the scour medium employed at customary rates of addition, without requiring separation of the scour medium from the produced rutile titanium dioxide and while keeping the rutile content of the combined spent scour medium and produced rutile titanium dioxide at about 99 percent and greater by weight.
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