Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime

作     者：Yun-long He Rui-dong Xu Shi-wei He Han-sen Chen Kuo Li Yun Zhu Qing-feng Shen 

作者机构：Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2019年第26卷第6期

页      面：689-700页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 

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) 

主　　题：lead anode slime pressure leaching arsenic removal antimony bismuth 

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 *** 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 *** 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)***,antimony,and lead are thus separated from lead anode slime as Na3AsO4·10H2O and *** 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 *** Pb(IV)and Sb(V)content was found to increase substantially with the addition of NaNO3.