Technology for Preparing Calcium Fluoride from Aluminum Production Waste

Abstract

Aluminum production is accompanied by production of fluorine-containing solid waste. Every year in the Bratsk Aluminum Plant 40000 tons of this waste is produced with a high fluorine and carbon content. Technology for producing calcium fluoride is developed in order to regenerate fluorine. Optimum conditions are studied and determined for leaching fluorine from aluminum electrolysis production waste. Conditions are determined necessary for regenerating sodium fluoride solution with which synthetic calcium fluoride is obtained suitable for use as an additive to electrolyte in aluminum production.