As the world's capacity for aluminium production increases, the amount of waste connected with this industry is also increasing. Spent potlining (SPL) from aluminium reduction cathodes presents a ...major environmental concern in the primary aluminium industry. It is concluded that leachable cyanide and fluoride compundes present the major problem in SPL disposal. The behaviour of cyanide and fluoride under high temperature treatment has been investigated. On the basis of this laboratory investigation, the possibilities of SPL utilisation in red brick manufacturing, cement industry and thermal power plants were evaluated. SPL refreactory material is already reused in red-brick manufacturing. In the cement industry, a pilot test on the utilization of 25 t SPL carbon waste mixed with green petrol coke gave positive results. Additionally, a fluoride emission forecast for thermal power plant utilizing carbon waste SPL mixed with coal was elaborated.
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