Abstract
The increasing of aluminum demand globally raises the interest in developing alternative technologies to produce alumina from non-bauxitic sources, especially clays. This paper studies the extraction of alumina from the kaolin ore excavated from the Irkutsk region, Russia through the leaching process, using aqueous solutions of sodium carbonate as a leaching agent. Before the leaching process, the kaolin ore and limestone charge was sintered. The sintering process achieves the dehydroxylation of the kaolinite, which is the main mineralogical phase in the kaolin and activates its transformation to metakaolin. Metakaolin is an amorphous AlSi phase, from which alumina could be easily leached. The annealed sintered material transform into dust that is suitable for the leaching process without any additional grinding. The sintering process was taken place in the temperature range 800-1400 °C for 1 h. The effect of briquetting pressure and sintering temperature on the recovery of alumina from kaolin, were studied. About 87% of the alumina in the kaolin was extracted at 1360 °C and briquetting pressure of 5 MPa.
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