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Electrical conductivity optimization of the Na3alF6–al2O3–sm2O3 molten salts system for al–sm intermediate binary alloy production

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International Journal of Minerals,Metallurgy and Materials 2017年第9期24卷 1034-1042页

作者： Chun-fa Liao Yun-fen Jiao Xu Wang Bo-qing Cai Qiang-chao Sun Hao Tang Institute of Metallurgical and Chemical Engineering Jiangxi University of Science and Technology

Metal sm has been widely used in making al–sm magnet alloy materials. Conventional distillation technology to produce sm has the disadvantages of low productivity, high costs, and pollution generation. The objective of this study was to develop a molten salt electrolyte system to produce al–sm alloy directly, with focus on the electrical conductivity and optimal operating conditions to minimize the energy consumption. The continuously varying cell constant(CVCC) technique was used to measure the conductivity for the Na3alF6–alF3–LiF–MgF2–al2O3–sm2O3electrolysis medium in the temperature range from 905 to 1055°C. The temperature(t) and the addition of al2O3(W(al2O3)), sm2O3(W(sm2O3)), and a combination of al2O3and sm2O3into the basic fluoride system were examined with respect to their effects on the conductivity(κ) and activation energy. The experimental results showed that the molten electrolyte conductivity increases with increasing temperature(t) and decreases with the addition of al2O3or sm2O3or both. We concluded that the optimal operation conditions for al–sm intermediate alloy production in the Na3alF6–alF3–LiF–MgF2–al2O3–sm2O3system are W(al2O3) + W(sm2O3) = 3wt%, W(al2O3):W(sm2O3) = 7:3, and a temperature of 965 to 995°C, which results in satisfactory conductivity, low fluoride evaporation losses, and low energy consumption.

关键词： aluminium oxide samarium oxide molten salt electrical conductivity regression analysis al–sm intermediate alloy

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