Benefication of titania slag by oxidation and reduction treatment
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United States of America Patent
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Oct 12, 2004
Grant Date -
N/A
app pub date -
Jun 15, 2001
filing date -
Jul 29, 1998
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Abstract
This invention relates to a method of treating titania slag to increase the leachability of impurities from the slag consisting of the steps of sizing the titania slag to a particle size from 75 to 850 .mu.m; oxidizing the sized slag particles at a temperature from about 700.degree. C. to below about 900.degree. C. causing the iron present in the slag to concentrate at the exposed surfaces of the slag particles and/or causing an anatase phase to stabilize in the slag, causing a major portion of the iron in the Fe(II) state to convert to the Fe(III) state, and causing the titanium in the Ti(III) state to be converted to the Ti(IV) state; and reducing the oxidized slag in a reducing atmosphere from about 700.degree. C. to about 950.degree. C. to convert a major portion of the iron in the Fe(III) state to the Fe(II) state. The invention also relates to a method of beneficiating titania slag to increase the TiO.sub.2 content thereof wherein the above treated slag is leached with acid.
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