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Recovery of sodium fluoride and other chemicals from spent carbon liners

机译:从废碳衬里回收氟化钠和其他化学品

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.
机译:通过在环境温度下用苛性碱溶液浸取衬里,然后从浸出液中浸入抑制化合物的方法,从铝电解槽的废阴极衬里材料中回收氟离子和铝以及碳,这些废阴极衬里材料从铝电解槽中回收氟化钠在浸出液中的溶解度。氨是优选的化合物。还回收了铝化合物以及碳值。该过程中使用的处理化学品被回收。该过程基本上是一个闭环过程,基本上没有废水排放。

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