Method for purifying wet process phosphoric acid
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United States of America Patent
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Nov 25, 1980
Issued Date -
N/A
app pub date -
Aug 25, 1977
filing date -
Aug 25, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for removing impurities from wet process produced phosphoric acid and recovering phosphate values retained by the impurities is disclosed. The wet process produced phosphoric acid is filtered through a diatomite filter cake in a porous medium at a temperature from about 57.degree. C. to about 77.degree. C. During filtering an impurity-containing upper portion of the filter cake is removed exposing a fresh surface of the filter cake. An aqueous slurry is formed with the removed portion of filter cake. The slurry is filtered to recover a filtrate containing a major portion of the phosphate values retained by the removed portion of the filter cake.
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