Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime
- 13 Downloads
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 Na3AsO4· 10H2O 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.
Keywordslead anode slime pressure leaching arsenic removal antimony bismuth
Unable to display preview. Download preview PDF.
This work was 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), and the Cooperation project between School and Enterprise of China (No. 0201352042).
- B. Xu, H. Zhong, and T. Jiang, Recovery of valuable metals from Gacun complex copper concentrate by two-stage countercurrent oxygen pressure acid leaching process, Miner. Eng., 24(2011), No. 10, p. 1082.Google Scholar
- K. Ahmadi, Y. Abdollahzadeh, M. Asadollahzadeh, A. Hemmati, H. Tavakoli, and R. Torkaman, Chemometric assisted ultrasound leaching-solid phase extraction followed by dispersive-solidification liquid-liquid microextraction fordetermination of organophosphorus pesticides in soil samples, Talanta, 137(2015), p. 167.CrossRefGoogle Scholar
- X.W. Yang, Handbook of Thermodynamic Data in Aqueous Solutions at High Temperature, Metallurgical Industry Press, Beijing, 1983, p. 37.Google Scholar
- M. Pourbaix, Atlas of Electrochemical Equilibria in Aqueous Solutions, National Association of Corrosion Engineers, Houston, 1974, p. 489.Google Scholar
- I.A. Ammar and A. Saad, Anodic oxide film on antimony: II. Parameters of film growth and dissolution kinetics in neutral and alkaline media, J. Electroanal. Chem. Interfacial Electrochem., 34(1972), No. 1, p. 159.Google Scholar
- M.V. Vojnović and D.B. Šepa, Charge transfer process Sb(III)/Sb(V) in alkaline media, J. Electroanal. Chem. Interfacial Electrochem, 39(1972), No. 2, p. 413.Google Scholar
- Y. Zhu, R.D. Xu, Y.L. He, N. Li, and S.Z. Chen, A Method for Separating Lead, Antimony and Arsenic from Anode Slime Alkaline Lixivium, Chinese Patent, Appl. 201611034010.2, 2017.Google Scholar
- J.F. Moulder, W.F. Stickle, P.E. Sobol, and K.D. Bomben, Handbook of X-Ray Photoelectron Spectroscopy, Physical Electronics, Inc., Minnesota, 1995, p. 231.Google Scholar
- L. Bodenes, A. Darwiche, L. Monconduit, and H. Martinez, The solid electrolyte interphase a key parameter of the high performance of Sb in sodium-ion batteries: Comparative X-ray photoelectron spectroscopy study of Sb/Na-ion and Sb/Li-ion batteries, J. Power Sources, 273(2015), p. 14.CrossRefGoogle Scholar