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测量了BaF_2-NaF-MgF_2三元系熔度,发现当向BaF_2-NaF共晶添加MgF_212%时,可使初晶温度降到750℃。当在此体系中采用上浮铝阴极电解MgO时,制取Al-Mg合金中mg含量达12%,电流效率可达84%。还测量了各种温度下的BEMF,其值随温度的降低和电流密度的升高而明显增加。当电解温度为950℃、电流密度为1A/cm~(?)时,其值为1.82V,高出理论分解电压0.42V,据此提出了类似于铝电解的阳极反应机理。
The melting degree of BaF_2-NaF-MgF_2 ternary system was measured. It was found that when the addition of MgF_212% to BaF_2-NaF eutectic, the primary crystallization temperature can be reduced to 750 ℃. When using this method, the content of mg in Al-Mg alloy reaches 12% and the current efficiency can reach 84%. The BEMF at various temperatures was also measured and its value increased significantly with decreasing temperature and increasing current density. When the electrolysis temperature is 950 ℃ and the current density is 1 A / cm ~ (?), The value is 1.82V, which is 0.42V higher than the theoretical decomposition voltage. Therefore, anodic reaction mechanism similar to aluminum electrolysis is proposed.