Technology of Reducing Carbon Dust Amount in Aluminum Electrolysis Production with High Lithium Potassium Electrolyte System

Abstract

This publication addresses a significant high carbon dust amount in aluminum electrolysis with a high lithium potassium electrolyte. The wettability of electricity on carbon materials and the influence of molecular ratios on carbon content in electrolyte melts were studied. Industrial tests were carried out, and the carbon dust amounts dropped significantly due to targeted measures. The results show that the wettability of high lithium potassium electrolyte with carbon materials is better than that of pure electrolyte with low or no LiF and KF content. Generally, the carbon content and carbon dust in high lithium potassium electrolytes caused by domestic alumina use are higher than those of pure electrolyte systems, but a reasonable range of molecular ratios could keep the carbon content below 0.2%. The key measures for reducing carbon dust in high lithium and high potassium systems follow the same rules for the wettability of the electrolyte to the carbon materials.