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STUDIES OF ZN-PB SINTER REDUCTION USED AS A BATCH IN IMPERIAL SMELTING PROCESS
Abstract
The article presents research on kinetics of sinter reduction used as a charge in the process of simultaneous smelting of zinc and lead, commonly known as Imperial Smelting Process. The aim of the study was to determine the effect of reductivity of various sinters produced from sulphide raw materials and from waste oxides on the operation of a shaft furnace. Real sinter samples from the sinter plant operating at the ISF furnace were collected for the experiment. The experiment was carried out in a resistance furnace with a horizontal pipe at the temperatures below 900°C to exclude zinc reduction. A mixture of nitrogen and carbon monoxide was used as a reducer. Reduction kinetics were determined based on the analysis of flue gas. Research has shown that at lower temperatures there are no significant differences in the reduction of sinters, while in higher temperatures the reduction of waste oxides sinter was faster. Moreover, from the comparison of the reduction characteristics at lower and higher temperatures, it was found that the use of too large pieces of sinter may delay the reduction of zinc and even cause endothermic direct reduction of lead.
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References6
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