A novel hydrothermal method for zinc extraction and separation from zinc ferrite and electric arc furnace dust
来源期刊:International Journal of Minerals Metallurgy and Materials2016年第2期
论文作者:Hui-gang Wang Yang Li Jian-ming Gao Mei Zhang Min Guo
文章页码:146 - 155
摘 要:A novel hydrothermal process was developed to extract zinc from pure zinc ferrite(ZnFe2O4) nanopowder and zinc-containing electric arc furnace(EAF) dust using hexahydrated ferric chloride(FeCl3-6H2O) as a decomposing agent.The effects of solid FeCl3-6H2O to ZnFe2O4 ratio by mass(RF/Z),hydrothermal reaction temperature,and time on zinc extraction were systematically investigated.In the results,when the hydrothermal reaction is conducted at 150℃ for 2 h with RF/Z of 15:20,the efficiency of zinc extraction from ZnFe2O4 reaches97.2%,and the concentration of ferric ions(Fe3+) in the leaching solution is nearly zero,indicating a high selectivity for zinc.In addition,the zinc extraction efficiency from the EAF dust reaches 94.5%in the case of the hydrothermal reaction performed at 200℃ for 10 h with the solid FeCl3-6H2O to EAF dust ratio by mass(RF/EAF dust) of 15:10.Zinc and iron separation is achieved by adjusting the pH value of the leaching solution according to the different precipitation pH values of metal hydroxides.
Hui-gang Wang,Yang Li,Jian-ming Gao,Mei Zhang,Min Guo
Beijing Key Laboratory of Green Recycling and Extraction of Metals, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
摘 要:A novel hydrothermal process was developed to extract zinc from pure zinc ferrite(ZnFe2O4) nanopowder and zinc-containing electric arc furnace(EAF) dust using hexahydrated ferric chloride(FeCl3-6H2O) as a decomposing agent.The effects of solid FeCl3-6H2O to ZnFe2O4 ratio by mass(RF/Z),hydrothermal reaction temperature,and time on zinc extraction were systematically investigated.In the results,when the hydrothermal reaction is conducted at 150℃ for 2 h with RF/Z of 15:20,the efficiency of zinc extraction from ZnFe2O4 reaches97.2%,and the concentration of ferric ions(Fe3+) in the leaching solution is nearly zero,indicating a high selectivity for zinc.In addition,the zinc extraction efficiency from the EAF dust reaches 94.5%in the case of the hydrothermal reaction performed at 200℃ for 10 h with the solid FeCl3-6H2O to EAF dust ratio by mass(RF/EAF dust) of 15:10.Zinc and iron separation is achieved by adjusting the pH value of the leaching solution according to the different precipitation pH values of metal hydroxides.
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