A Study on the Mechanism of Aluminia extraction from Coal Fly Ash

Coal fly ash contains large amounts of aluminum, iron, silicon and other useful elements. Its utilization effectively is of significance to harmonious development of economy, society and environment. However, coal fly ash is mainly composed of mullite and other inert glassy matters with high degree of polymerization and its reactivity is poor. So the fly ash needs to be activated before utilization. This article studied the effect of activation by calcination added with NaOH additives on aluminium extraction. The results showed that the addition of NaOH could improve the aluminium extraction rate evidently. Detailed analysis and characterization was carried out by using X-ray diffraction (XRD). The results indicated that NaOH could improve the depolymerization of vitreous.