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| HORIZONTAL ELECTROREFINING OF Al IN Na3AlF6–LiF MOLTEN SALT |
| JIA Ming, TIAN Zhongliang, LAI Yanqing, LIU Fangyang, LI Jie, LIU Yexiang |
| School of Metallurgical Science and Engineering, Central South University, ChangSha 410083 |
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Cite this article:
JIA Ming TIAN Zhongliang LAI Yanqing LIU Fangyang LI Jie LIU Yexiang. HORIZONTAL ELECTROREFINING OF Al IN Na3AlF6–LiF MOLTEN SALT. Acta Metall Sin, 2011, 47(6): 727-734.
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Abstract A creative and simple horizontal electrorefining method had been developed for high pure aluminum production in fluoride molten salt. Impure primary aluminum was purified due to the different electronegativity between Al and impurities during electrorefining. Pre–electrolysis was effective in the purification of electrolyte, concentration of impurities such as Cu, Si and P were reduced to 3.2×10−6, 14×10−6 and 1.5×10−6, respectively. Aluminum electrorefining could run steady with current density as high as 800 mA/cm2, hich indicated that the uneven current density istribution had no bad effect on the electrochemical process. The anode nd cathode were both covered by Na3AlF6–LiF electrolyte, hich argely reduced the oxidation of aluminum at hih temperature and yieded a igh curent efficiency of 98.6%. The analysis of the anode feed and refined aluminum showed a remarkabe reduction of the mass fraction of Cu, from 14.5×10−6 to 0.9×10−6. Besides, particular mention should be made of efficient removaof impuritis likF, Si and Zn, the purity of electrorefined aluminum was above 99.99%.
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Received: 12 January 2011
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| Fund: Supported by Specialized Research Fund for the Doctoral Program of Higher Education (No.200805331120), Hunan Provincial Innovation Foundation for Postgraduate and Graduate Degree Thesis (No.CX2009B036) and Innovation Foundation of Central South University (No.2010bsxt02) |
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