ANALYSIS OF REFINING OF ALUMINUM USING FRACTIONAL SOLIDIFICATION WITHFORCED-CONVECTION

Segregation of iron atoms during refining of aluminum using the fracti onal solidification technique has been analyzed. The redistribution of the solute atoms was influenced by the solidification and solid/liqui d interface tangential velocities. Aluminum purity increased with decr easing solidification velocity and increasing tangential velocity. The diffusion boundary thickness was inversely proportional to the square root of the tangential velocity in the cylindrical rotating system. E ffects of the tangential and solidification velocities on the effectiv e redistribution coefficient were investigated. The calculated refinin g curves were in good agreement with measured values.