Aluminium Hydroxide Ultrafine Powder Extracted from Fly Ash

Al(OH)3 ultrafine powder was extracted from fly ash with the method of dispersing agent-carbonizating. Fly ash is activated by the method of sintering with limestone, so the inert mullite can be convert into C 12 A 7 which can be dissolved in Na 2 CO 3 liquor. The conversion of β-C 2 S to γ-C 2 S is accompanied by an increase in volume and results in the self-pulverization of the sintering feed, and the diameter of the self-pulverized powder is below 1μm. Na 2 CO 3 liquor was used to leach Al 2 O 3 in the form of NaAlO 2 from the self-pulverized powder. High performance dispersing agent is added in the carbonation process to control the crystal and aggregation of Al(OH) 3 , and the ultrafine powder of Al(OH) 3 is prepared, which diameter is less than 0.4μm.