论文摘要
A new alkaline pressure oxidative leaching process（with NaNO3 as the oxidant and NaOH as the alkaline reagent） is proposed herein to remove arsenic, antimony, and lead from bismuth-rich and arsenic-rich lead anode slime for bismuth, gold, and silver enrichment.The effects of the temperature, liquid-to-solid ratio, leaching time, and reagent concentration on the leaching ratios of arsenic, antimony, and lead were investigated to identify the optimum leaching conditions. The experimental results under optimized conditions indicate that the average leaching ratios of arsenic, antimony and lead are 95.36%, 79.98%, 63.08%, respectively. X-ray diffraction analysis indicated that the leaching residue is composed of Bi, Bi2O3, Pb2Sb2O7, and trace amounts of NaSb（OH）6. Arsenic, antimony, and lead are thus separated from lead anode slime as Na3 As O4×10 H2 O and Pb2Sb2O7. Scanning electron microscopy and energy-dispersive spectrometry imaging revealed that the samples undergo appreciable changes in their surface morphology during leaching and that the majority of arsenic, lead, and antimony is removed. X-ray photoelectron spectroscopy was used to demonstrate the variation in the valence states of the arsenic, lead, and antimony.The Pb（IV） and Sb（V） content was found to increase substantially with the addition of NaNO3.
论文目录
文章来源
类型: 期刊论文
作者: Yun-long He,Rui-dong Xu,Shi-wei He,Han-sen Chen,Kuo Li,Yun Zhu,Qing-feng Shen
来源: International Journal of Minerals Metallurgy and Materials 2019年06期
年度: 2019
分类: 工程科技Ⅱ辑,工程科技Ⅰ辑
专业: 冶金工业
单位: Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
基金: financially supported by the National Natural Science Foundation of China(No.51564031),Independent Research Project of the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization(No.CNMRCUTS1707),the Cooperation project between School and Enterprise of China(No.0201352042)
分类号: TF803.21
页码: 689-700
总页数: 12
文件大小: 544K
下载量: 18
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