Method for preparing flaky alumina by means of aluminium ash

The invention discloses a method for preparing flaky alumina by means of aluminium ash. The method mainly comprises the following steps of leaching, purification, precursor synthesis and calcination,wherein 1, the aluminium ash is used as a raw material, and leaching is conducted by means of sulfuric acid to obtain a leaching liquid; 2, the leaching liquid pH is controlled as 3, a KMnO4 solutionis added to make Fe in the leaching liquid precipitate, and a purified aluminium salt solution is obtained; 3, the purified aluminium salt solution is heated and stirred, and a neutralization agent isadded into the purified aluminium salt solution slowly to obtain gel; 4, the obtained gel is subjected to vacuum dehydration and drying, and then molten salt is added for sintering at high temperature to obtain a sintering product; 5, the sintering product is subjected to immersion, ultrasonic cleaning, alcohol washing and then dried to obtain the flaky alumina. By adopting the method for treating the aluminium ash, the pr