Detoxification of aluminum spent potliner by thermal treatment,

Details Detoxification of aluminum spent potliner by thermal treatment, Detoxification of aluminum spent potliner by thermal treatment,

1991-10-11

1992-11-17

Straub, Gary P.

Chemistry of inorganic compounds

Miscellaneous process

423111, 423364, 423497, 423484, 423DIG20, 106791, 405129, 588252, C01B 720

Patent

active

051641747

ABSTRACT:
A method is disclosed for detoxification of aluminum spent potliner by thermal treatment in a rotary kiln while blended with limestone and metal silicates to destroy cyanides and convert the soluble fluoride salts to relatively insoluble calcium fluoride and fluoride-bearing minerals, quenching the hot kiln discharge with an aqueous lime slurry to convert residual soluble fluoride salts on the particle surfaces to an insoluble form, and treating aqueous landfill runoff and capture with lime or limestone and recycling the treated water to the process. The treated material is suitable for landfilling in a non-hazardous waste landfill or marketing as a raw material. Air emissions are innocuous and there is no aqueous discharge.

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