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氯化物熔體中鐵離子的平衡及其應用

Equilibrium Between Ferric and Ferrous Species in Chloride Melts

  • 摘要: 為了更好地了解鎂電解中及熔鹽氯化中鐵的行為,對鐵離子在氯化物中的化學平衡作了研究。求出在PCl3=101.325kPa和實驗溫度下,反應FeCl_2(熔)+1/2Cl2(氣)=FeCl3(熔)的表觀平衡常數K。在PCl2=0和實驗溫度下,FeCl3完全分解。K的測量值與回歸方程的預報值很吻合。熔鹽體系、氯分壓和溫度對K值影響較大,總鐵濃度的影響稍小一些。在其他條件相同時,體系3的K值最大,這表明,用光鹵石作為電解質時,鎂電解的電流效率會低一些,而氯化鉀含量高時,在熔鹽氯化中鐵的催化作用較好。

     

    Abstract: 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.

     

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