Abstract
In order to elucidate the kinetics and mechanism of liquid antimony oxidation, experiments were conducted with air and oxygen-argon gas mixtures from the view point of an antimony recovery from antimony-bearing materials such as an used lead-battery and InSb, GaSb semiconductors. The experimental condition was in the temperature range between 973 and 1,173 K, in the oxygen partial pressure range between 0.05 and 0.25 atm.The experimental results show that the oxidation rate increases with increasing gas flow rate, oxygen partial pressure and temperature. An evaporation study of pure water into an argon gas stream was then carried out with respect to the mass transfer characteristics in the gas phase in the reactor used for the present work. The Sherwood number is correlated by the following equation : Sh = 1.38Re0.64Sc1/2. Then the equation was applied to analyze the oxidation kinetics of liquid antimony. The kinetic analysis shows that the mass transfer step in the gas phase controls the overall rate in the experimental range studied, except for the condition of 0.05 atm as the oxygen partial pressure.
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