Abstract
The comparison of zinc fuming rates between copper converter and lead-zinc blast furnace slags, the influence of CaO or FeO content of the slag on the zinc fuming rate and the effect of fuming gas composition on the yields of matte and metal were examined by introducing CO-CO2 gas mixtures or N2 gas into the molten slag at the temperatures of 1220°C and 1280°C.The zinc fuming rate of the converter slag was lower than that of the lead-zinc blast furnace slag.It is probably due to the reduction of magnetite present in the converter slag together with the reduction of zinc oxide, especially at the beginning-of the time of slag fuming.The zinc fuming rate was increased by adding CaO to the slag in the range of 1-20% CaO.But the effect of the FeO contents of 30% and 45% of the slag, keeping the CaO%/SiO2% ratio constant, on the zinc fuming rate was not apparent.The quantities of matte and metal separated from the slag increased with the increase of CO content in the fuming gas.
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