Studies on Alumina Cement from Alunite (I) (Synthesis of monocalcium aluminate)

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J. Korean Ceram. Soc. > Volume 15(4); 1978 > Article

Journal of the Korean Ceramic Society 1978;15(4): 199.

명반석을 이용한 알루미나 시멘트의 제조(I) (Monocalcium Aluminate의 합성)

한기성

인하대학교 공대 요업공학과

Studies on Alumina Cement from Alunite (I) (Synthesis of monocalcium aluminate)

ABSTRACT

In the present investigation, refined alumina obtained from alunite locally available was used as a aluminous source to synthesize monocalcium aluminate $(CA)_3$ the major mineral constituent of alumina cement. The influence of $SiO_2$ and $Fe_2O_3$ contents on the formation of monocalcium aluminate was studied by X-ray diffraction analysis mainly. About 0.8-1.0 of $Al_2O_3/C_3O$ mol ratio and less than 4 percent of $SiO_2$ were desirable for the effective formation of CA. The small amount of alkali and sulphur contents contained in refined alumina from alunite as the impurities were affected to form $C_4A_3S$ and $C_3S_2$, disadvantageous compounds for the alumina cement, therefore the impurities should be restricted in minimum content as possible.