THE MECHANISM OF EXTRACTING CHLORO-COMPLEX ACIDS OF PLATINOID WITH TRIBUTYL PHOSPHATE AND TRIALKYL PHOSPHINE OXIDE

Acta Metall Sin

1982, Vol. 18

Issue (2): 235-244 DOI:

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THE MECHANISM OF EXTRACTING CHLORO-COMPLEX ACIDS OF PLATINOID WITH TRIBUTYL PHOSPHATE AND TRIALKYL PHOSPHINE OXIDE

Chen Jing;Yang Zhengfen;Cui Ning Institute of Precious Metals; Ministry of Metallurgical Industry; Kunming

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Chen Jing;Yang Zhengfen;Cui Ning Institute of Precious Metals; Ministry of Metallurgical Industry; Kunming. THE MECHANISM OF EXTRACTING CHLORO-COMPLEX ACIDS OF PLATINOID WITH TRIBUTYL PHOSPHATE AND TRIALKYL PHOSPHINE OXIDE. Acta Metall Sin, 1982, 18(2): 235-244.

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Abstract The influence of HCl concentration on the extraction distribution coefficients was examined when chloro-complex acids of Pt(Ⅳ),Pd(Ⅳ),Ir(Ⅳ),Pt(Ⅱ),Pd (Ⅱ),Rh(Ⅲ) and Ir(Ⅲ)extracted by TBP.The comparative tests between TBP and trialkyl phosphine oxide were also made.After the visible and ultrared spectra observations of the organic phases and the investigation of effect of H_2SO_4 and HClO_4 on extraction,it is reasonable to point out that the extraction is regarded as the mechanism of hydration and solvation of hydrogen ions.Thus, derivation of its energy change expression,explanation of the sequence of MCl_6~(2-)>MCl_4~(2-)>MCl_6~(3-) resulted experimentally and principle of the“least cherge density”are accomplished.According to the approximate formula of distribution coefficient derived from reaction equilibrium equation,the reasons of the peak occurred in the distribution curves and the auxiliary or inhibitory effect of H_2SO_4 or HClO_4 on extraction respectively were discussed.

Received: 18 February 1982

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