文章摘要
硫代硫酸盐浸出脱铜阳极泥中金、银和钯的研究
Leaching Au, Ag and Pd from Decopperized Anode Slime by Thiosulfate Solutions
投稿时间:2018-06-17  
DOI:
中文关键词: 有色金属冶金  脱铜阳极泥  贵金属  醋酸预处理  硫代硫酸盐浸出
英文关键词: nonferrous metallurgy  decopperized anode slime  precious metals  acetic acid pretreatment  thiosulfate leaching
基金项目:国家自然科学基金(51504293)。
作者单位E-mail
杨俊奎 青海铜业有限责任公司西宁 810000 369177646@qq.com 
徐斌 中南大学 资源加工与生物工程学院长沙 410083 xubincsu@csu.edu.cn 
李科 中南大学 资源加工与生物工程学院长沙 410083  
高伟 中南大学 资源加工与生物工程学院长沙 410083  
马永鹏 中南大学 资源加工与生物工程学院长沙 410083  
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中文摘要:
      密度泛函计算和热力学分析表明,相较于Au(I)和Ag(I)离子,Pd(II)离子更容易与S2O32-发生配位反应,3种元素均可被氨性硫代硫酸盐溶液浸出。脱铜阳极泥中高含量的锡和锑对硫代硫酸盐浸出贵金属无明显影响,但铅以PbO形态存在时会覆盖在贵金属表面抑制浸出。硫代硫酸盐对脱铜阳极泥中贵金属的直接浸出率低;阳极泥先经氢氧化钠预处理去除部分铅后浸出率有所提高;经碳酸盐转化-醋酸预处理可去除阳极泥中93.8%的铅,硫代硫酸盐对金、银和钯的浸出率达到88.0%、93.4%和80.7%。X射线衍射(XRD)和X射线光电子能谱(XPS)分析表明,醋酸预处理后阳极泥颗粒表面没有出现PbO钝化层。
英文摘要:
      The results of DFT (density functional theory) calculation and thermodynamics analysis show that S2O32- is easier to coordinate with Pd(II) than Au(I)and Ag(I), and that the three elements can be leached by ammoniacal thiosulfate solution. High contents of Sn and Sb in the decopperized anode slime exerted no evident effect on the thiosulfate leaching of precious metals, but Pb that existed in the form of PbO could cover the surface of precious metals and thus inhibited their leaching. A low leaching rate of precious metals was attained by direct thiosulfate leaching of the slime. The leaching rate was improved after removing part of the Pb by sodium hydroxide pretreatment. After carbonate transformation-acetic acid pretreatment, 93.8% of Pb was removed, and as much as 88.0% of Au, 93.4% of Ag and 80.7% of Pd could be extracted by thiosulfate leaching. The results of XRD and XRF indicate that no passivation layer was observed on the surface of anode slime particles.
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