电解槽中无铝液进行电解时阴极表面炭的侵蚀与脱落

研究了铝电解槽阴极碳块表面在电解过程中被电解质侵蚀而脱落的情况,探讨了其被侵蚀脱落的机理。得出电解过程中当阴极没有铝液存在时,电解槽的阴极表面被电解质严重侵蚀并脱落掉渣。电解时测定不同极距下的槽电压,研究了不同电解质高度上的电解质熔体导电性能的变化,得出:电解开始时槽内电解质熔体的导电性能是均一的;电解一段时间后电解质熔体的电阻改变很大。这是由电解过程中有金属产物从阴极表面溶解,脱落的炭渣以及阳极气体在电解质熔体中的溶解等综合因素引起的。

Carbon Cathode Corrosion and the Changes of Molten Bath during Aluminum Electrolysis

Carbon cathode corrosion during aluminum electrolysis is studied in laboratory aluminum reduction cell.The results show that the cathode surface is corroded badly and that the carbon particles fallen off when there was not aluminum in the cell.The conductibility change of the molten bath at different distance to the cathode surface is measured and studied.The results show that the change of resistance is caused by carbon particles fallen from the cathode and anode,metallic species and the anode gas dissolved in the molten bath.