Studies on Alumina Cement from Alunite (II) (Physical Properties of Alumina Cement)

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J. Korean Ceram. Soc. > Volume 16(3); 1979 > Article

Journal of the Korean Ceramic Society 1979;16(3): 164.

명반석을 이용한 알루미나 시멘트의 제조 (II) (알루미나 시멘트의 특성)

한기성, 최상욱, 송태웅

인하대학교 공대 요업공학과

Studies on Alumina Cement from Alunite (II) (Physical Properties of Alumina Cement)

ABSTRACT

In the previous paper, it was reported that formation of desirable calcium alunimate(CA) in clinker was considerably affected by sulfur-contaminated alumina which was prone to form a disadvantageous mineral, $C_4A_3S$. In this study, however, sulphate-free alumina cement was made from sulfur-free alumina refined from alunite and corresponding materials. The major minerals in the clinker were identified by X-ray diffraction patterns as calcium aluminate (CA), calcium dialuminate $(CA_2)$ and dicalcium alumino silicate $(C_2AS)$. The formation of CA was more effective with decreasing contents of silica to 2 per cent or less and sulfur in the refined alumina. Physical properties of prepared alumina cement such as setting time, stability and compressive strength were measured. The values were similar to those of commercial alumina cements.