电导法测定工业铝电解槽电解质冰晶石分子比

来源期刊：中南大学学报(自然科学版)1981年第3期

论文作者：杨济民 秦瑞卿

文章页码：51 - 57

关键词：酸性电解质； 电导率测定； 冰晶石分子比； 铝电解槽； 电导法； 水浸液； 铝含量； 烧结温度； 标准试样； 氟化镁

摘    要：用添加定量的NaF于定量的工业铝电解槽电解质试样中,且在700℃进行烧结,然后测定烧结试样水浸液的电导率的方法来确定电解质的冰晶石分子比。同时研究了电解质中Al₂O₃、CaF₂、MgF₂和LiF含量对烧结试样水浸液电导率的影响。进一步利用回归分析确定了水浸液电导温度系数与电解质试样中剩余氟化铝含量的关系。最后推导了计算电解质冰晶石分子比的公式。实验所测定的数据,用热滴定法进行了校核,平均相差0.02。研究表明,经改进的电导法完全能够应用于测定工业铝电解质冰晶石分子比。

Abstract: The cryolite ratio of the commercial aluminum cell electrolyte was determined by measuring the conductivity of the aqueous leaching solution ofthe sintered specimen which was prepared by adding quantitative sodiumfluoride into quantitative electrolyte specimen and then sintering it at 700℃.At the same time, the influence of the content of Al₂O₃. CaF₂. MgF₂ andLiF in the electroyte on the conductivity of the aqueous leaching solutionof the sintered specimen was studied. Furthermore, the dependence of thetemperature coefficient of the conductivity of the aqueons leaching solutionon the excess AlF₃ content in electrolyte specimen was determined by regression analysis. At last, the formula to calculate the cryolite ratio of thealuminum electrolyte with was derived. Data resulting from the ‘conductivity-method’ were checked against the thermo--titrimetic method. The average difference was about 0.02 between them. The researeh shows, the improved‘conductivity--method’ can be well used in the measurement of the cryoliteratio of the commercial aluminum cell bath.