利用粉煤灰制备超细Al_2O_3技术研究

Study on the preparation of ultra-fine alumina from coal fly ash

研究了一种利用粉煤灰制备超细Al2O3粉体的方法。采用酸浸法提取粉煤灰中的Al(OH)3,提取率达75%以上;采用溶胶-凝胶法将Al(OH)3制备成Al2O3超细粉体,最终得到纯度为99.01%,粒度在50nm左右,比表面积为262.3m2/g左右的超细氧化铝粉体。这种利用电厂粉煤灰采用酸法提取、溶胶-凝胶法制备超细Al2O3粉体的方法是一种高附加值综合利用粉煤灰的有效途径。

In this paper a method of extracting ultra -fine alumina powder from fly ash is introduced. Acid leaching is used to extract Al（OH） 3 from coal fly ash. The extraction rate of Al （OH） 3 can reach over 75 % ; The Sol - gel method is used to prepare the ultra - fine alumina. Lastly the purity of the a- lumina is excess 99.01%, the size is about 50nm and the specific surface area is about 262.3m2/g. The acid leaching and Sol - gel process is an ideal method to extract high purity ultra- fine alumina from fly ash, which can bring good economic benefit and environmental benefit.