Method for extracting high-purity AlFeO3 powder from coal ash

The invention discloses a method for extracting high-purity AlFeO3 powder from coal ash. The method comprises the following steps that 1, solid salicylic acid is added into a coal ash-water system, after stirring and ultrasonic reaction, standing is conducted, an amaranthine complex which suspends on the upper layer is separated out, and after the amaranthine complex is subjected to multiple washing and drying treatment, dry ferro-aluminum salisylate complex powder is obtained; 2, a dry pot containing the ferro-aluminum salisylate complex powder in the step 1 is placed in a muffle furnace, andafter calcination is conducted in the air, the AlFeO3 powder can be obtained. Compared with the prior art, the method for extracting the high-purity AlFeO3 powder from the coal ash has the beneficialeffects that controllable regeneration of the coal ash is achieved, and a new path is provided for preparation and application of the high-purity AlFeO3 powder; the method has the characters that operation is simple, the cost