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黄金科学技术 ›› 2014, Vol. 22 ›› Issue (4): 108-112.doi: 10.11872/j.issn.1005-2518.2014.04.108

• 冶炼技术与装备研发 • 上一篇    下一篇

某难浸金矿的次氯酸盐法直接浸金试验研究

李超1,2,李宏煦1,2,杨勰1,2,王帅1,2   

  1. 1.北京科技大学冶金与生态工程学院,北京   100083;
    2.稀贵金属绿色回收与提取北京市重点实验室,北京   100083
  • 收稿日期:2014-04-26 修回日期:2014-06-17 出版日期:2014-08-28 发布日期:2014-12-24
  • 通讯作者: 李宏煦(1971-),男,甘肃天水人,教授,从事有色金属冶金研究工作.lihongxu2001@126.com
  • 作者简介:李超(1989-),男,山西侯马人,博士研究生,从事黄金冶炼及二次资源利用研究工作.messi2626@126.com
  • 基金资助:

    国家自然科学基金重点项目“铁铝复合矿中非铁元素分离与提取新工艺的基础研究”(编号:51234008)资助

Experimental Study on the Leaching of Gold from a Refractory Gold Concentrate by Chloride-hypochlorite Solution

LI Chao1,2,LI Hongxu1,2 ,YANG Xie1,2,WANG Shuai1,2   

  1. 1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing   100083,China;
    2.Beijing Key Laboratory of Green Recovery and Extraction of Precious Metals,Beijing   100083,China
  • Received:2014-04-26 Revised:2014-06-17 Online:2014-08-28 Published:2014-12-24

摘要:

采用次氯酸钠溶液法对国内某难浸金矿进行了直接浸出试验研究,考察了NaClO浓度、NaCl浓度和反应时间等条件对浸金率的影响,并采用X射线衍射、XRF、SEM和EDS能谱等测试对金精矿与浸出渣进行了表征,简要分析了浸出机理。试验结果表明:精矿中的金在pH<8、电位>900 mV的条件下,能够被浸出并形成稳定配合物存在于溶液中,最佳实验条件为[NaCl]=50 g/L,[NaClO]=200 g/L,液固比=20∶1, 3 h后反应基本完成,金浸出率可达96.26%,脱硫率达98%以上。与传统氰化法相比,次氯酸盐法具有流程短、污染小和反应速度快等优点。

关键词: 非氰试剂, 次氯酸盐法, 金精矿, 浸出

Abstract:

In this research,sodium hypochlorite solution was used for leaching gold from a refractory gold concentrate.The influence of NaCl and NaClO concentration,and reaction time to the leaching rate were investigated in this experiment.The raw materials and the leaching residue were characterized by a series of analysis methods such as XRD,XRF,SEM and EDS,and the reaction mechanism are analyzed in this paper.Results indicate that the leaching rate and the desulfurization rate can be achieved 96.26% and 98% respectively at most optimum conditions as follows:NaCl concentration 50 g/L,NaClO concentration 200 g/L,liquid-solid ratio 10∶1,the best reaction time was 150 mins,and these conditions should be guaranteed pH<8.0,Eh>900 mV.Experimental results show that the method of chloride-hypochlorite leaching has the advantages of short process,low pollution and higher in reaction rate compared with the traditional cyanidation method.

Key words: non-cyanide reagent, refractory gold concentrate, chloride-hypochlorite solution, leaching

中图分类号: 

  • TF831

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