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Recovery of sodium fluoride and other chemicals from spent carbon liners
Recovery of sodium fluoride and other chemicals from spent carbon liners
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机译:从废碳衬里回收氟化钠和其他化学品
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摘要
Floride and aluminum values, as well as carbon, are recovered from waste cathode liner material from aluminum electrolytic cells by leaching of the liner at ambient temperature with a caustic solution, followed by precipitation of sodium fluoride by saturating the leach liquor with a compound which suppresses the solubility of sodium fluoride in the leach liquor. Ammonia is a preferred compound. Aluminum compounds, as well as the carbon values, are also recovered. Treating chemicals used in the process are recycled. The process is essentially a closed-cycle process with substantially no discharge of effluent.
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