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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 3    September 1995

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THE DIGESTION OF SYNTHETIC GIBBSITE
Li Chaoqun1 Zhang Pinmin2; Chen Qiyuan2; Chen Xinmi2

1.Hunan Institute of Diamond Products; Changsha 410011;
2.Central South University of Technology; Changsha 410083

Abstract:The Dissolution process of synthetic gibbsite in sodium hydroxide solution was investigated by isothermal calorimetry in a conduction-type automatic calorimeter. The experiment was carried out at 75~100 ℃ . The reagent used for dissolution was 4. 19~7. 37 mol/L NaOH solution. The heat of the digestion of synthetic gibbsite was measured. By analyzing the effect of temperature and concentration on dissolution rate, a mathematical model for dissolution process was derived. The experimental result showed that the rate determining step is a chemical reaction rather than diffusion. A first-order dependence on the concentration of sodium hydroxide was observed. The apparent activation energy is 76. 85 kJ/mol, which is in fair agreement with that in references.

 

Key words: synthetic gibbsite; digestion; heat effect; kinetic behavior

ISSN 1672-7029
CN 43-1423/U

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