Preparation of Alumina Powder from Aluminum Salts by Precipitation Method

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J. Korean Ceram. Soc. > Volume 30(12); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(12): 1045.

알루미늄 염으로부터 침전법에 의한 알루미나 분체의 제조

이전, 최상욱, 조동수, 이종길, 김승태

인하대학교 무기재료공학과

Preparation of Alumina Powder from Aluminum Salts by Precipitation Method

ABSTRACT

Alumina hydrates were prepared by the neutralization of AlCl3.6H2O solution with NH3 gas diluted with N2 gas. The values of pH in reaction solution influenced the formation of alumina hydrates minerals. Amorphous alumina hydrates, for example, were formed at ${gamma}$-Al2O3longrightarrow$delta$-Al2O3longrightarrow$theta$-Al2O3longrightarrow$alpha$-Al2O3. (2) Bayeritelongrightarrowamorphouslongrightarrow${gamma}$-Al2O3longrightarrow$delta$-Al2O3longrightarrowη-Al2O3longrightarrow$theta$-Al2O3longrightarrow$alpha$-Al2O3. On the other hand, the shape of alumina hydrates whichw ere prepared by the reacton of Al2(SO4)3.16H2O solution and NH3 gas was spherical, the progress of its phase transformation with increasing temperature was amorphouslongrightarrow${gamma}$-Al2O3longrightarrow$alpha$Al2O3 in sequence.