铝电解槽氧化铝浓度控制过程分析

对铝电解槽氧化铝过(欠)量下料过程中氧化铝浓度变化规律以及对槽电压、电解质温度的影响进行分析。结果表明:一定条件下,过(欠)量下料持续时间均随氧化铝浓度变化范围的增大而增大,随过(欠)量百分数的增大而减小,过量下料持续时间随二次反应率的增大而减小,欠量下料持续时间随二次反应率的增大而增大;相同条件下,欠量下料的持续时间大于过量下料;一定条件下,槽电压随下料过(欠)量百分数的增大而增大,电解质温度变化量随下料欠量百分数的增加而降低,随下料过量百分数的增加而增加。

Analysis of Alumina Concentration Control in Aluminum Electrolytic Bath

Variation of alumina concentration during overfeeding or underfeeding operation and its effects on cell voltage and electrolyte temperature were studied. The results show that the overfeeding or underfeeding operation period extends with increase of alumina concentration variation and shortens with increase of overfeeding or underfeeding percentage, while overfeeding operation period shortens with rise of aluminum oxidation reaction rate and underfeeding operation period extends at the fixed condition. The period of underfeeding operation is longer than that of overfeeding operation. The cell voltage increases with the increase of overfeeding or underfeeding percentage. Variation of electrolyte temperature drops with increase of underfeeding percentage and rises with increase of overfeeding percentage at the fixed condition.