Thermal Reaction of Iron Precipitates Prepared by Adding Sodium Carbonate Solution to Ferrous Chloride and Ferric Chloride Solutions

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J. Korean Ceram. Soc. > Volume 18(2); 1981 > Article

Journal of the Korean Ceramic Society 1981;18(2): 105.

염화철과 탄산나트륨 용액에 의한 철 침전물의 열반응

이서우, 김태옥, 김종희

부산대학교 무기재료공학과

Thermal Reaction of Iron Precipitates Prepared by Adding Sodium Carbonate Solution to Ferrous Chloride and Ferric Chloride Solutions

ABSTRACT

The iron precipitates were prepared by adding sodium carbonate solution to ferrous chloride and ferric chloride solutions to pH=9 and pH=4.5, respectively. The thermal reaction of the iron precipitates was investigated by means of TGA, DTA and X-ray diffraction. In the former the crystallization of $alpha$-$Fe_2O_3$ begins at about 35$0^{circ}C$, while in the latter at about 30$0^{circ}C$, during the calclnation in air. In the iron precipitate from ferrous chloride solution, the activation energy for the crystallite-growth or $alpha$-TEX>$Fe_2O_3$ in air is about 7.6$times$104J/mole between 800 and 100$0^{circ}C$. As the result of X-ray diffration for the reduction product of hematite, it was found that maghemite, magnetite and wustite are formed and that hematite is transformed to magnetite through maghemite.