Extractions of Pd(II) and Pt(IV) from Hydrochloric Acid Solution by Dihexyl Sulfide and the Degradation of Dihexyl Sulfide

OKUDA Akihiko, SAWAI Hiroshi, ICHIISHI Satoshi, SHIBATA Junji

doi:10.2473/shigentosozai.116.929

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Dihexyl sulfideによる塩酸溶液からのPd (II)およびPt (IV)の抽出とSulfideの劣化について
Dihexyl sulfide ニヨルエンサンヨウエキカラノ Pd 2 オヨビ Pt 4 ノチュウシュツト Sulfide ノレッカニツイテ
Extractions of Pd(II) and Pt(IV) from hydrochloric acid solution by dihexyl sulfide and the degradation of dihexyl sulphide

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Extraction of Pd(II) and Pt(IV) with dihexyl sulfide (DHS) from chloride solutions, and the degradation of DHS to dihexyl sulfoxide (DHSO) were investigated in this study.<br> When Pt(IV) exists in aqueous solution to be extracted, the extraction of small amounts of Pt(IV) causes the oxidation of DHS to DHSO as well as the reduction of Pt(IV) to Pt(II). The presence of DHSO in organic phase results in the formation of insoluble substances with metals ions such as Sn(IV), Fe(III), Si(VI), Zn(II) and Pt(IV) at the interface between the organic and aqueous phases. The appearance of the insoluble substances is due to the low solubility both in aqueous and organic phases. The insoluble substance is decreased by the addition of the modifier like alcohols.<br> In the extraction of metal ions, the repeated operation of extraction and stripping of metal ions with DHS increases the amount of DHSO. The extraction of Pt(IV) is increased, when the contact time is extended and when the concentration of Pd(II) is lower in the extraction operation of Pd(II) and Pt(IV) by DHS. It is considered that the oxidation of DHS takes place by the following reaction.<br> H₂PtCl₆ + 3DHS_org + H₂O →PtCl ₂·(DHS)_{2, org} + DHSO_org + 4HCl<br>

Journal

Shigen-to-Sozai

Shigen-to-Sozai 116 (11), 929-933, 2000

The Mining and Materials Processing Institute of Japan

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