Process for the treatment of a calcium aluminophosphate
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United States of America Patent
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Mar 23, 1982
Grant Date -
N/A
app pub date -
Aug 5, 1980
filing date -
Sep 7, 1979
priority date (Note) -
Expired
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Abstract
A process for treating a rock essentially constituted by calcium aluminophosphate, comprising the treatment of the ground rock with a concentrated sulfuric acid in stoichiometric excess with respect to calcium and aluminum, at a temperature of above about 120.degree. C., for a time between a few minutes and about 5 hours, followed by controlled water take-up. Subsequently, a residue containing substantially all the calcium and the aluminum of the rock and a solution of the acids serving to digest a tricalciumphosphate charge are separated. The process is particularly suitable for the treatment of Thies phosphate ore.
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