Abstract:Address to significantly high carbon residue amount in aluminum electrolysis with high lithium potassium electrolyte, the wettability of electrolyte on carbon materials and influence of molecular ratio on carbon content in electrolyte melt were studied, then industrial tests were carried out, and the carbon dust amount drops significantly. The results show that the wettability of high lithium potassium electrolyte with carbon materials is better than that of pure electrolyte. The wettability could be reduced by decreasing molecular ratio or increasing superheat of electrolyte. Generally, carbon content in high lithium potassium electrolyte is higher than that of pure system, but reasonable range of molecular ratio could keep the carbon content below 0.2%. The key measures of reducing carbon dust amount in high lithium and high potassium system are slightly different, but the rule is the same as that of electrolyte to the change of the wettability of carbon materials.