METHOD OF PROCESSING FLUOROCARBON-CONTAINING WASTES OF ELECTROLYTIC ALUMINUM PRODUCTION Russian patent published in 2005 - IPC

FIELD: production of aluminum by electrolysis of molten salts; processing wastes of this process.

SUBSTANCE: proposed method includes delivery of solid fluorocarbon-containing wastes and oxygen-containing gas into reactor followed by high-temperature roasting for obtaining secondary raw material for production of aluminum. Finely-dispersed fluorocarbon-containing and sulfur-containing wastes are fed for roasting at weight ratio of fluorine to sulfur no less than 4:1; anode gases of electrolytic aluminum production process taken from organized gas cleaning system are used as oxygen-containing gas. Wastes are delivered in form of suspension in which liquid-to-solid ratio is maintained at 0.5-1.5:1. Proposed method improves operation of electric precipitators and ensures return of compounds in form of secondary high-quality regenerating cryolite.

EFFECT: reduced emissions of toxic agents into atmosphere.

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