TY - JOUR
T1 - A process for defluorination and purification of wet process phosphoric acids containing high AI concentrations
AU - Eyal, Aharon
AU - Baniel, Avraham
PY - 1984/7/1
Y1 - 1984/7/1
N2 - A solvent extraction process is described for defluorination and desulfation of filter phosphoric acids with high Al content. The solvent used contain an amine and phosphoric acid as main constituents. The acid obtained is compatible with feed-grade requirements. It can be concentrated to 56-60% PgOcby multiple effect evaporation, decreasing steam requirements by 50%. If an acid-base couple solvent is used in this process, part of the extracted phosphate can be recovered by back-wash with water in the form of highly purified phosphoric acid low in metals, fluorine and sulfate. The remainder of the acid along with the extracted sulfate is obtained as ammonium salt. The extracted F is converted into crystaline alkali fluorosilicate.
AB - A solvent extraction process is described for defluorination and desulfation of filter phosphoric acids with high Al content. The solvent used contain an amine and phosphoric acid as main constituents. The acid obtained is compatible with feed-grade requirements. It can be concentrated to 56-60% PgOcby multiple effect evaporation, decreasing steam requirements by 50%. If an acid-base couple solvent is used in this process, part of the extracted phosphate can be recovered by back-wash with water in the form of highly purified phosphoric acid low in metals, fluorine and sulfate. The remainder of the acid along with the extracted sulfate is obtained as ammonium salt. The extracted F is converted into crystaline alkali fluorosilicate.
UR - http://www.scopus.com/inward/record.url?scp=84949699666&partnerID=8YFLogxK
U2 - 10.1080/07366298408918470
DO - 10.1080/07366298408918470
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AN - SCOPUS:84949699666
SN - 0736-6299
VL - 2
SP - 677
EP - 697
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 4-5
ER -