Leaching Treatment of Discarded Waste Cathodes in Aluminum Electrolysis

An industrial experiment was carried out by classifying the waste cathodes of aluminum electrolytic cells in Shanxi Province and investigating the effect of particle size and temperature on the leaching of soluble fluoride. It was discovered that NaF was the main dissolvent and could be effectively dissolved by four-stage leaching at 348 K and that the soluble fluorine could be decreased to the limit for hazardous solid waste. After the leaching of discarded water, the fluoride concentration in the final water was enriched to 17.69 g/L, and the effective enrichment of fluoride ion was realized.