Study on the Effect and Mechanism of Calcination of Asbestos Tailings Mixed with Ammonium Sulfate

The research involves the calcination of Sichuanshimian asbestos tailings with ammonium sulfate in order to extract magnesium. This paper studies the effect of different calcination conditions on the magnesium extraction rate, and it also studies the mechanism of calcination of asbestos tailings mixed with ammonium sulfate. The results were characterized by XRD, TGA and elemental analysis. The results showed that as the temperature rises the magnesium extraction rate first increases and then decreases. Optimal experimental conditions are calcination temperature of 600℃, calcination time of 1.5 h, the amount of sodium added of 20%, under which condition a magnesium extraction rate of 85.16% can be achieved.