Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第6期
论文作者：Yun-long He Rui-dong Xu Shi-wei He Han-sen Chen Kuo Li Yun Zhu Qing-feng Shen
文章页码：689 - 700
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, Bi2 O3, Pb2 Sb2 O7, 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 Pb2 Sb2 O7. 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.
Yun-long He1，Rui-dong Xu1,2，Shi-wei He1，Han-sen Chen1，Kuo Li1，Yun Zhu1，Qing-feng Shen1
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
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, Bi2 O3, Pb2 Sb2 O7, 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 Pb2 Sb2 O7. 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.
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