The hydrochloric acid route for phosphate rock
The hydrochloric acid route for phosphate rock
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DOI：
10.1002/jctb.280380208
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发表时间：
2007-04
影响因子：
3.4
通讯作者：
F. Habashi;F. T. Awadalla;X. Yao
中科院分区：
文献类型：
--
作者：
F. Habashi;F. T. Awadalla;X. Yao
当用盐酸浸出磷矿时，镭可以通过与Ba 0.4Ca 0.6SO 4共沉淀而除去，铀可以通过用5%磷酸三丁酯的己烷或Varsol溶液萃取而除去。然后通过用未稀释的磷酸三丁酯萃取将磷酸与氯化钙溶液和其他杂质分离。萃余液用NH_3沉淀镧系元素，用H_2SO_4沉淀CaSO_4·2H_2O，再生HCl循环使用。含有H3PO4的有机相可以用NH3汽提以产生磷酸铵并再生磷酸三丁酯用于循环。氟可以作为Na2SiF6从初始浸出溶液中沉淀。
When phosphate rock is leached with hydrochloric acid, radium can be removed by co-precipitation with Ba0.4Ca0.6SO4 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 NH3, and CaSO4.2H2O by H2SO4 to regenerate HCl for recycle. The organic phase containing H3PO4 can be stripped by NH3 to yield ammonium phosphate and to regenerate the tributyl phosphate for recycle. Fluorine can be precipitated from the initial leach solution as Na2SiF6.