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Solvent extraction of Fe3+ from the hydrochloric acid route phosphoric acid by D2EHPA in kerosene
Yang Jin,Yujing Ma,Yanling Weng,Xuhong Jia,Jun Li 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
It is necessary to remove Fe3+ from the hydrochloric acid route phosphoric acid before it is purified by trin-butyl phosphate (TBP), otherwise the final product will fail because of the excessive iron content. Di-(2-ethylhexyl) phosphoric acid (D2EHPA, HA) is effective for Fe3+ extraction. Therefore, the solvent extraction of Fe3+ from the HCl-route phosphoric acid by D2EHPA in kerosene is investigated. The effects of the extraction time, temperature and concentrations of phosphoric acid, D2EHPA, calcium chloride and Fe3+ on the extraction process are studied. The mechanism of the extraction is explained and the extracted species is demonstrated to be FeClA2 4HA. D2EHPA has a high efficiency for Fe3+ extraction from the synthesis and actual HCl-route phosphoric acid with extraction percent of 98.61% and 96.50%, respectively via a cross-current 3-stage extraction. The loaded organic phase is effectively stripped (99.9%) using 6 mol/L hydrochloric acid. The extractant also has a high stability under a closed operation condition. D2EHPA can serve as an adequate extractant for the extraction of Fe3+ from the HCl-route phosphoric acid.