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黄金科学技术 ›› 2016, Vol. 24 ›› Issue (5): 115-120.doi: 10.11872/j.issn.1005-2518.2016.05.115

• 冶炼技术与装备研发 • 上一篇    下一篇

硫代硫酸钠—铁氰化钾体系提取含金物料中金银的研究

肖力1,2,吕翠翠1,2,王永良1,2,叶树峰1,2*   

  1. 1.中国科学院过程工程研究所,北京   100190;
    2.中国科学院大学,北京   100049
  • 收稿日期:2016-06-28 修回日期:2016-07-19 出版日期:2016-10-28 发布日期:2016-12-27
  • 通讯作者: 叶树峰(1966-),男,江西余干人,研究员,从事冶金反应工程研究工作。 E-mail:sfye@ipe.ac.cn
  • 作者简介:肖力(1991-),男,湖北监利人,硕士研究生,从事非氰化法提取金银研究工作。13546394471@163.com
  • 基金资助:

    国家自然科学基金项目“复杂体系无机涂层高温粘附特征响应机理及过程调控”(编号:51202249)、国家高技术研究发展计划(“863”计划)项目“氰化渣硫铁金梯级分离富集与无害化技术”(编号:2011AA06A104)和“十二五”国家科技支撑计划项目“金矿短流程磨浮工艺研究及示范”(编号:2012BAB08B04)联合资助

XIAO Li 1,2,LV Cuicui 1,2,WANG Yongliang 1,2,YE Shufeng 1,2   

  1. 1.Institute of Process Engineering,Chinese Academy of Sciences,Beijing    100190,China;
    2.University of Chinese Academy of Sciences,Beijing    100049,China
  • Received:2016-06-28 Revised:2016-07-19 Online:2016-10-28 Published:2016-12-27

摘要:

研究采用一种环保、高效的硫代硫酸盐—铁氰化钾体系替代广泛使用的氰化法提取物料中的金银。在这种新的硫代硫酸盐体系中,利用更加稳定的K3Fe(CN)6替代传统的四氨合铜作为氧化剂。考察了硫代硫酸盐浓度、K3Fe(CN)6浓度以及溶液的初始pH值对浸出效果的影响。实验证明,这种新的体系能够快速有效地溶解金银,反应初始阶段铁氰化钾作氧化剂时,银的溶解速度非常快,铁氰化钾消耗完之后,银的溶解机理转变为氧气驱动的过程,此时银的溶解速率下降较多。该体系在浸出剂略微过量的情况下即可实现对金银的有效浸出。将该体系用于硫酸渣中金银的提取,在浸出条件为:0.05 M五水合硫代硫酸钠、1 mM铁氰化钾、pH=8时,浸出48 h后,金银的提取率分别为88%和92%。

关键词: 硫代硫酸钠, 铁氰化钾, 硫酸渣, 金银浸出

Abstract:

The leaching of silver with the environmental effective sodium thiosulfate-potassium ferricyanide-sodium ferrocyanide alternative system has been studied.The thiosulfate leaching system was used to replace the widely-used cyanide.In this new thiosulfate leaching system,the more stable potassium ferricyanide was used to replace the traditional tetra-amine copper as oxidant.The effect of thiosulfate concentration,ratio of ferricyanide to ferrocyanide,pH,and temperature on silver leaching has been investigated.The results showed  that this leaching system was quietly efficient to the dissolution of silver,the silver leaching rate was extremely fast when the ferricyanide acted as oxidation in the initial stage.After the complete consumption of potassium ferricyanide,silver dissolution was driven by oxygen and leaching rate decreased.A high silver leaching rate could be achieved in the case of a slight excess of lixiviant.In the leaching of sulfuric acid residue,leaching conditions were 0.05 M Na2S2O3·5H2O,1 mM  K3Fe(CN)6,at pH=7,the extraction rate of gold and silver were 88% and 92%  respectively after a leaching time of 48 hours.

Key words: sodium thiosulfate, potassium ferricyanide, sulfuric acid residue, gold and silver leaching

中图分类号: 

  • TF831 

[1] Sparrow G J, Woodcock J T.Cyanide and other lixiviant leaching systems for gold with some practical applications[J].Mineral Processing and Extractive Metullargy Review,1995,14(3/4):193-247.
[2] Breuer P,Jeffrey M.Thiosulfate leaching kinetics of gold in the presence of copper and ammonia[J].Minerals Engineering,2000,13(10):1071-1081.
[3] Chu C,Breuer P,Jeffrey M.The impact of thiosulfate oxidation products on the oxidation of gold in ammonia thiosulfate solutions[J].Minerals Engineering,2003,16(3):265-271.
[4] Choo W L,Jeffrey M.An electrochemical study of  copper cementation of gold (I) thiosulfate[J].Hydrometallurgy,2004,71(3):351-362.
[5] Ficeriov J,Bal P, Villachica C L.Thiosulfate leaching of silver,gold and bismuth from a complex sulfide concentrates[J].Hydrometallurgy,2005,77(1):35-39.
[6] Senanayake G.Gold leaching by copper (II) in ammoniacal thiosulphate solutions in the presence of additives.Part I:A review of the effect of hard-soft and Lewis acid-baseproperties and interactions of ions[J].Hydrometallurgy,2012,115/116:1-20.
[7] Ha V H,Lee J C,Huynh T H,et al.Optimizing the thiosulfate leaching of gold from printed circuit boards of  discarded mobile phone[J].Hydrometallurgy,2014,149:118-126.
[8] Muir D M, Aylmore M G.Thiosulphate as an alternative to cya nide for gold processing-issues and impediments[J].Mineral Processing and Extractive Metallurgy,2004,113(1):2-12.
[9] Jeffrey M.Kinetic aspects of gold and silver leaching in ammoniathiosulfate solutions[J].Hydrometallurgy,2001,60(1):7-16.
[10] Antelman M.The encyclopedia of chemical electrode potentials[M].Berlin:Springer,2012.
[11] Byerley J J,Fouda S A,Rempel G L.Kinetics and mechanism of the oxidation of thiosulphate ions by copper(II) ions in aqueous ammonia solution[J].Journal of the Chemical Society,Dalton Transactions,1973(8):889-893.
[12] Aylmore M G, Muir D M.Thermodynamic analysis of  gold leaching by ammoniacal thiosulfate using Eh/pH and speciation diagrams[J].Minerals & Metallurgical Processing,2001,18(4):221-227.
[13] Aylmore M.Alternative lixiviants to cyanide for leaching gold ores[J].Developments in Mineral Processing,2005,15:501-539.
[14] Jeffrey M,Watling K,Hope G A,et al.Identification of surface species that inhibit and passivate thiosulfate leaching of gold[J].Minerals Engineering,2008,21(6):443-452.
[15] Alvarado  M,Fuentes  A,Nava F.Silver leaching with the thiosulfatenitrite-sulfite-copper alternative system[J].Hydrometallurgy,2015,152:120-128.
[16] Xia C.Associated sulfide minerals in thiosulfate leaching of gold:Problems and solutions[D].Kingston:Queen’s University,2008.
[17] Yu H,Zi F,Hu X,et al.The copper-ethanediaminethisulphate leaching of gold ore containing limonite with cetyltrimethyl ammonium bromide as the synergist[J].Hydrometallurgy,2014,150:178-183.
[18] Chandra I,Jeffrey M.A fundamental study of ferric oxalate for dissolving gold in thiosulfate solutions[J].Hydrometallurgy,2005,77(3):191-201.
[19] Heath J,Jeffrey M,Zhang H,et al.Anaerobic thiosulfate leaching:Development of in situ gold leaching systems[J].Minerals Engineering,2008,21(6):424-433.
[20] Zhang H,Nicol M,Stauntion W.An electrochemical study of an alternative process for the leaching of gold in thiosulfate solutions[C]//International  Symposinm on theTreatment of Gold Ores Calgary,2005:243-257.
[21] Zhai J,Zhai Y,Dong S.Direct dissolution of Au nanoparticles induced by potassium ferricyanide[J].Colloids and Surfaces a physicochemical and engineering aspects,2009,335(1):207-210.
[22] Xie F,Dreisinger D,Lu J.The novel application of  ferricyanide as an oxidant in the cyanidation of gold and silver[J].Minerals Engineering,2008,21(15):1109-1114.
[23] Rivera I,Pati O F,Roca A,et al.Kinetics of metallic silver leaching in the O2-thiosulfate system[J].Hydrometallurgy,2015,156:63-70.

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