氯化物熔体中铁离子的平衡及其应用

为了更好地了解镁电解中及熔盐氯化中铁的行为,对铁离子在氯化物中的化学平衡作了研究。求出在PCl₃=101.325kPa和实验温度下,反应FeCl_₂(熔)+1/2Cl₂(气)=FeCl₃(熔)的表观平衡常数K。在PCl₂=0和实验温度下,FeCl₃完全分解。K的测量值与回归方程的预报值很吻合。熔盐体系、氯分压和温度对K值影响较大,总铁浓度的影响稍小一些。在其他条件相同时,体系3的K值最大,这表明,用光卤石作为电解质时,镁电解的电流效率会低一些,而氯化钾含量高时,在熔盐氯化中铁的催化作用较好。

Equilibrium Between Ferric and Ferrous Species in Chloride Melts

A study on the equilibrium between ferric and ferrous species in chloride melts has been made for better understanding of the behavior of iron species in magnesium electrolysis and moltensalt chlorination. At PCl₂=101.325kPa. and experimental temperatures, the apparent equilibrium constant of the reaction can be given. At PCl₂=0 and experimental temperatures, FeCl₃ decomposed completely. It has been found that the measured values of K were in good agreement with the expected ones from the regression equations. The composition of melts, partial presure of chlorine and temperature had important effect on K. At the same other conditions, there were the maximunm values of K in system 3, indicating that the current efficiency of magnesium electrolysis would be lower if carnallitc was used as electrolyte, and that the catalytic effect of iron in molten-salt chlorination would be better when the content of KCI in the melts increaesed.