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The hydrochloric acid route for phosphate rock
Author(s) -
Habashi Fathi,
Awadalla Farouk T.,
Yao XinBao
Publication year - 1987
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280380208
Subject(s) - tributyl phosphate , raffinate , hydrochloric acid , phosphoric acid , chemistry , phosphorite , ammonium phosphate , phosphate , nuclear chemistry , extraction (chemistry) , uranium , inorganic chemistry , chromatography , materials science , fertilizer , organic chemistry , metallurgy
When phosphate rock is leached with hydrochloric acid, radium can be removed by co‐precipitation with Ba 0.4 Ca 0.6 SO 4 and uranium by extraction with a 5% solution of tributyl phosphate in hexane or Varsol. Phosphoric acid is then separated from calcium chloride solution and other impurities by extraction with undiluted tributyl phosphate. The lanthanides can be precipitated from the raffinate by NH 3 , and CaSO 4 .2H 2 O by H 2 SO 4 to regenerate HCl for recycle. The organic phase containing H 3 PO 4 can be stripped by NH 3 to yield ammonium phosphate and to regenerate the tributyl phosphate for recycle. Fluorine can be precipitated from the initial leach solution as Na 2 SiF 6 .