[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system]

[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system] Research Abstract Details 

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[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system] Abstract Text:

Hong-ping Tang,Ming-de Yang,Pei-jiong He,Tian-dou Hu,Jing Zhang,Ya-ning Xie,

Quaternary ammonium salt has strong affinity with gold in cyanide solutions, but it is not readily stripped. Stripping with acidic thiourea solutions and air sparging shows promise. There are some reports on the process of thiourea stripping, but little about its mechanism. In this paper, the stripping mechanism of N263/sulphuric thiourea/alkaline cyanide gold solution is studied by EXAFS. According to the experiments, sulphuric acid, thiourea and gold-thiourea complex can be extracted by N263 as a neutral molecule, and the stripping process can be described as following: (1) Sulphuric acid and thiourea are extracted by N263; (2) In organic phase, gold-cyanide complex is converted to gold-thiourea complex, which exists as Au[SC(NH2)2]2HSO4, and CN- forms HCN with acid at the same time; (3) HCN is removed by air sparging, and Au[SC(NH2)2]2HSO4 is distributed between organic phase and liquor phase, most of which transfers to liquor phase and is stripped.

[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system] Publishing Authors By Initials

HP Tang,MD Yang,PJ He,TD Hu,J Zhang,YN Xie,

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[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system] Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Guang pu xue yu guang pu fen xi = Guang pu

VOLUME: 24

Page Numbers: 752-5

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ISSN: 1000-0593

DAY: 15

MONTH: Jun

YEAR: 2004

[EXAFS study on the stripping mechanism in N263/alkaline cyanide gold solution/sulfuric thiourea system] Information

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LANGUAGE: chi

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AFFILIATION: Institute of Nuclear Energy and Technology, Tsinghua University, Beijing 102201, China.

Country: China

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MEDLINETA: Guang Pu Xue Yu Guang Pu Fen X

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