Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Kinetics of Seed Growth of α-Ferric Oxyhydroxide

α-Ferric oxyhydroxide 입자의 핵성장 반응에 관한 연구

  • Seul, Soo-Duk (Department of Chem. Eng., College of Engineering, Dong-A Univ.) ;
  • Shin, Dong-Ock (Department of Chem. Eng., College of Engineering, Dong-A Univ.)
  • 신동옥 (동아대학교 공과대학 화학공학과) ;
  • 설수덕 (동아대학교 공과대학 화학공학과)
  • Received : 1997.03.06
  • Accepted : 1997.06.02
  • Published : 1997.08.10

Abstract

The seed formation and growth of $\alpha$-ferric oxyhydroxide with aerial oxidative precipitation from aqueous solution of ferrous sulfate with KOH, NaOH, $Na_2CO_3$ and $K_2CO_3$ as precipitants have been studied by free pH drift experiment. It has been shown that all precipitants give same particle formation and growth path, and average particle length from KOH and NaOH as precipitants was about 1.5 times shorter than that of $K_2CO_3$ and $Na_2CO_3$. When initial mole ratio, $R_o=[Fe^{2+}]_o/[OH^-]_o$ of KOH was decreased the particle was grown oxyhydroxide seed growth from aqueous solution of ferrous sulfate with KOH has been studied. The influence of the air flow rate, reaction temperature and initial mole ratio, $R_o=[Fe^{2+}]_o/[OH^-]_o$, on the kinetics of seed growth are investigated by static pH experiment. The oxidation rate of seed growth increased with increase in the air low rate, reaction temperature and initial mole patio. The activation energy of seed growth is 16.16 KJ/mol and the rate equation of seed growth can be written as follows: $-\frac{d[Fe^{2+}]}{dt}=1.46{\times}10^4[P_{o2}]^{0.66}[OH^-]^{2.19}exp(-\frac{16.16}{dt})$.

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