Abstract:A two-step alkaline-acidic leaching process was conducted to separate the cryolite from spent pot lining and to purify the carbon. The influencing factors of temperature, time, and the ratio of liquid to solid in alkaline and acidic leaching were investigated. The results show that the recovery of soluble compounds of Na₃AlF₆ and Al₂O₃ dissolving into the solution during the NaOH leaching is 65.0%，and the purity of carbon reaches 72.7%. During the next step of HCl leaching, the recovery of soluble compounds of CaF₂ and NaAl₁₁O₁₇ dissolving into the HCl solution is 96.2%, and the carbon purity increases to 96.4%. By mixing the acidic leaching solution and the alkaline leaching solution, the cryolite precipitates under a suitable conditions of pH value 9 at 70 °C for 2 h. The cryolite precipitating rate is 95.6%, and the purity of Na₃AlF₆ obtained is 96.4%.

Key words: spent pot lining; recovery; chemical leaching; aluminium electrolysis