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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PcI_3=101.325kPa和实验温度下,反应FeCl_2(熔)+1/2CI_2(气)=FeCI_3(熔)的表观平衡常数K。在P_CI2=0和实验温度下,FeCI_3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。
In order to better understand the behavior of iron in magnesium electrolysis and molten salt chlorination, the chemical equilibrium of iron ions in chloride was studied. The apparent equilibrium constant K of reaction FeCl 2 (melt) + 1 / 2Cl 2 (gas) = FeCI 3 (melt) at PcI 3 = 101.325 kPa and experimental temperature was calculated. At P_CI2 = 0 and experimental temperature, FeCI_3 completely decomposed. The measured values of K are in good agreement with the predicted values of the regression equation. Molten salt system, partial pressure of chlorine and temperature had a great effect on K value, and the effect of total iron concentration was slightly smaller. Under the same conditions, System 3 has the largest K value, indicating that when carnallite is used as electrolyte, the current efficiency of magnesium electrolysis will be lower, while the catalytic activity of iron in molten salt chlorination will be lower when the potassium chloride content is high better.