METHOD FOR RECOVERY OF ALUMINA FROM ALUMINIUM DROSS

摘要

ABSTRACT METHOD FOR RECOVERY OF ALUMINA FROM ALUMINIUM DROSS A method for recovery of a-alumina from aluminium dross is disclosed. The method comprises of grinding aluminium dross to obtain particles having average particle size in the range of 80-100 micron, leaching aluminium dross with an acid to obtain a leach liquor having precipitated silica, separating the silica from the leach liquor to obtain a liquid phase, treating the liquid phase with an aqueous ammonia at acidic pH to facilitate precipitation of iron hydroxide, separating the iron hydroxide from the liquid phase to obtain an iron free liquid phase, treating the iron free liquid phase with aqueous ammonia at alkaline pH to facilitate precipitation of aluminium hydroxide; separating and calcining the aluminium hydroxide to obtain a-alumina having size in the range of 200-700 nm. Fig: 2