Abstract
The influence of gas constituents and slag temperatures on zinc fuming rate was investigated by introducing gas mixtures of CO, H2 or CH4 with CO2 into molten slag at the temperatures of 1220°C and 1280°C.The slag, used in this experiment, contains some amount of carbon. The small amount of zinc was reduced by carbon at 1220°C bubbling nitrogen gas, but i t was' observed that carbon reacted easily with zinc oxide in slag at 1280°C.The amount of zinc, fumed by CO-CO2 gas at 1280°C, was larger than that of theoretical values. It is considered that CO2 was reduced to CO by carbon in the slag at these higher temperatures and that the high content of CO produced by this reaction helped to reduce the zinc oxide. The mixture of H2 and CO2 was a more effective reducing agent than CO-CO2 mixture. In the case of fuming by CH4-CO2 gas mixture, the most part of carbon formed by thermal decomposition of methane was not available for the direct reduct ion of zinc oxide.Assuming that the gas mixture leaving the slag bath is in equilibrium with zinc content remained in the slag, the activities of zinc oxide were determined from zinc fuming rates in this research and the values were reasonablly agreed with other published data.
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