Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Thermal Reaction of Iron Precipitates Prepared by Adding Sodium Carbonate Solution to Ferrous Chloride and Ferric Chloride Solutions

염화철과 탄산나트륨 용액에 의한 철 침전물의 열반응

  • 이서우 (부산대학교 무기재료공학과) ;
  • 김태옥 (부산대학교 무기재료공학과) ;
  • 김종희 (부산대학교 무기재료공학과)
  • Published : 1981.02.01
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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.

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