Analysis of Magnesium Droplets Characteristics and Separation Performance in a Magnesium Electrolysis Cell Based on Multiphysical Modeling
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Magnesium production is one of the most energy-intensive industrial processes. The core reactor is the magnesium electrolysis cell, and its electrolysis efficiency is a crucial factor that profoundly affects the amount of energy consumed. This work concerns the optimization of the electrolysis cell based on a three-dimensional thermo–electro–magneto-hydrodynamics coupling model. The new method takes into account of three types of electrolyte circulations in the cell. A particle tracking method coupled with the multiphysical model is also developed. The new model is an innovative approach in the evaluation of the primary separation rate of the magnesium droplets (PSR). The PSR in the original cell is about 16.6%. The effects of current intensity, cathode–anode distance, diameters of gas bubbles and magnesium droplets on the improvement of the PSR are negligible, whereas an increase in anode width significantly improves the PSR. Using the new multi-field model, two new modified electrolysis cells are designed by optimizing the cathode structure. The newly designed cells improve the PSR’s by 30.1 and 61.9%, significantly improving their electrolysis efficiency.
KeywordsElectrolysis efficiency Magnesium electrolysis cell Multiphysical fields Primary separation rate
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We acknowledge the financial support provided by National Natural Science Foundation of China (Grants 51504099 and U1407202) and Qinghai Science and Technology Department (Grant No. 2015-GX-Q19A).
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