Multiple-stage thermal beneficiation process for phosphate ores
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United States of America Patent
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Jun 21, 1983
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N/A
app pub date -
Jan 12, 1982
filing date -
Jan 12, 1982
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Expired
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Abstract
A multiple-stage thermal beneficiation process for phosphate ores which comprises calcining a phosphate ore in a first stage at a temperature sufficient to destroy substantial quantities of organic impurities in the phosphate ore but not so high as to cause excessive sulfide formation; followed by the calcining of the product from the first stage in a second stage at a temperature at which an additional amount of organic carbon impurities are destroyed but at a temperature which does not detrimentally reduce the surface area of the phosphate ore.
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