The Extraction of Alumina from Kaolin

Abstract

Alumina has wide industrial and technological applications thatcan be extracted from different locations, different methods and materials.Kaolin from Iraq Alduikhla astrologer has used as a raw material source foralumina production. The alumina concentration in the Iraqi kaolin is morethan 34% which considered as a good replacement for bauxite rack. Crushingandground is the first process to reduce the kaolin particle size to the micronlevel which increases the surface area of kaolin.The kaolin is heat treated at different temperatures (600, 650, 700 and 750) ̊Cfor 2 hours to remove some of ithe mpurity like organic materials and crystalwater before acid treatment. A different concentration of hydrochloric acid(pH) (0.45, 0.5, 0.55, 0.6 and 0.65) has used for extraction of alumina fromkaolin. The reaction between the hydrochloric acid and kaolin has studied atdifferent temperature (30, 60 and 90) ̊C. The extraction of alumina hasdecreased with increase t inhe reaction temperature. Finally t,,he aluminaextraction by this method has characterized using XRD and XRF toinvestigation the crystal structure and the amount of impurities presentedthere. The final extracted alumina h isaving cubic crystal structure (γalumina) with purity above 95%.