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中国有色金属学会会刊：英文版 1999年第2期9卷 189-194页

作者： chai liyuan1 and masazumi okido2 1 department of nonferrous metallurgy,central south university of technology, changsha 410083, p. r. china2 center for integrated research in science and engineering,nagoya university, nagoya 464, japan 中南工业大学有色冶金系湖南长沙 nagoya Univer.sity 日本

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关键词： alkaline thiour.asodium sulfitemix anode of gold and ir.n

Dissolution theor. of gold in alkaline thiour.a solution(Ⅲ) ——Ther.odynamics on dissolution of gold in alkaline thiour.a solution containing Na _2SO_3

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中国有色金属学会会刊：英文版 1999年第3期9卷 646-650页

作者： chai liyuan(柴立元) 1, masazumi okido 2 1. department of nonferrous metallurgy, central south university of technology, changsha 410083, p.r.china 2. center for.integrated research of science and engineering, nagoya university,nagoya 464, japan 中南工业大学有色冶金系湖南长沙 nagoya university 日本

The oxidants of gold wer. investigated in an alkaline thiour.a solution containing Na 2CO 3, in which Na 2S 2O 8 is a p.op.r.oxidant for.dissolving gold because of in such homogeneous sulfur.system coexisting comp.ex agent, oxidant and stabilizing agent. The ther.odynamic analyses wer. conducted on the dissolving of gold in the alkaline thiour.a solution containing Na 2SO 3 by the oxidants oxygen or.Na 2S 2O 8. The r.sults show that the p.ssibility of gold dissolution r.duces with incr.asing p. value, while oxygen acts as oxidant; and when Na 2S 2O 8 acts as the oxidant of gold in the alkaline thiour.a solution of p. 12.5, decomp.sition p.tential of thiour.a decr.ases fr.m the standar. value 0.42 V to -0.32 V, also the dissolution tr.nd of gold enhances with shifting the mix p.tential of the solution to the p.sitive dir.ction.

关键词： ther.odynamic analysis gold dissolution thiour.a leaching Document code:A

SELECTIVE DISSOLUTION OF GOLD IN AN ALKALINETHIOUr.A SOLUTION BY ELECTr.LYSIS

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Jour.al of central south university 1997年第2期9卷 73-78页

作者： Zhang Chuanfu chai liyuan Zhong Haiyun (department of nonferrous metallurgy, central south university of technology, changsha 410083, china)masazumi okido r.ouichiIchino(center er.or.11}researchinscienceandengineering nagoyauniversity,nagoya464,Ja department of nonferrous metallurgy Central South University of Technology Changsha 410083 China center for.integrated research in science and engineering Nagoya University Nagoya 464 Japan

Anodic p.lar.zation behavior.of gold, silver. cop.er. nickel and ir.n in p.tentiostatic condition has been examined in an alkaline aqueous thiour.a solution, wher. gold is har.ly dissoluble nor.ally. The addition of Na2SO3 into the solution can acceler.te anodic dissolution of gold. The factor. affecting selective dissolution of gold in the alkaline thiour.a solution by electr.lysis have been studied, and the op.imum condition was obtained. In 0.1 mol/L thiour.a solution of p. 12. 5 containing 0. 5 mol/L Na2SO3 and 2. 5% acetone, at the p.tential of 0. 34 V vs NHE, at the temp.r.tur. of 323 K, the dissolved mass of gold anode with the exp.sed ar.a of 1. 0 cm2 r.ached mor. than 300 mg·dm-3 within 30 min, and other.metals such as silver. cop.er. nickel and ir.n could har.ly dissolve.

关键词： p.lar.zation behavior selective dissolution of gold electr.lysis alkaline thiour.a solution sodium sulfite

DISSOLUTION THEOr. OF GOLD IN ALKALINE THIOUr.A SOLUTION(Ⅰ) Anodic Behavior. on Gold in Alkaline Thiour.a Solution Containing Na_2SO_3

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中国有色金属学会会刊：英文版 1999年第1期9卷 147-153页

作者： chai liyuan and masazumi okido department of nonferrous metallurgy, central south university of technology, changsha 410083, p. r.china center for.integrated research in science and engineering, nagoya university, nagoya 464, japan

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关键词： alkaline thiour.a sodium sulfite p.lar.zation behavior gold

STUDY ON SELECTIVE DISSOLUTION OF GOLD IN ALKALINE THIOUr.A MEDIA

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Jour.al of central south university 1997年第2期9卷 79-83页

作者： chai liyuan Zhong Haiyun Zhang Chuanfu (department of nonferrous metallurgy, central south university of technology, changsha 410083, china)masazumi kido r.ouichi Ichino(center for.integrated researchin science and engineering nagoya university,nagoya 4 department of nonferrous metallurgy Central South University of Technology Changsha 410083 China center for.integrated research in science and engineering Nagoya University Nagoya 464 Japan

Gold dissolves easily in an alkaline thiour.a solution with Na2SO3 and Na2S2O8, wher. the accomp.nied elements of Au, such as Ag, Cu, Ni and Fe can har.ly dissolve. It was consider.d that electr.chemical r.duction and catalytic action of SO32- p.event thiour.a fr.m decomp.sing ir.ever.ibly and acceler.tes dissolution of *** S2O82- as an oxidant can contr.l the p.tential so that for.amidine disulfide may for. efficiently. The dissolution of gold is mainly thr.ugh oxidation of Au by for.amidine disulfide and comp.exation of thiour.a with An+,and not dir.ct oxidation of S2O82-. Thus,sufficient for.amidine disulfide is necessar. to acceler.te the dissolution of gold. The r.ason for.Ag, Cu har.ly being dissoluble is that the black layer. of Ag2S and Cu1.92S for. on the sur.ace of Ag and Cu. The metal Ni and Fe do not dissolve in the alkaline media due to their.sulfide films p.ssivation samely.

关键词： mechanism selective dissolution of gold alkaline thiour.a electr.chemical r.duction and catalytic action for.amidine disulfide mix p.tential