Abstract
AbstractA mathematical model of the Imperial Smelting lead-zinc blast furnace was developed to determine the critical reactions and to evaluate certain parameters of its operation. The model was based on the assumption that equilibrium existed throughout, except that carbon was assumed not to react until it reached the tuyeres. The two major reactions occurring in the lower parts of the furnace are found to be:Zn(g) +CO2 = ZnO +CO (1)ZnS + Pb = Zn(g) + PbS(g) (2)The second one has heretofore been neglected, but it is critical in predicting the furnace behaviour. Large quantities of lead, zinc, and sulphur circulate inside the furnace in the tuyere-equilibrium zone. Results calculated by the model show that sinter sulphur content and tap temperature have a major effect on this circulation and on zinc recovery and slag composition. The predicted results and published furnace data are in good agreement, indicating that a calculation that assumes equilibrium is a useful approximation of a real furnace. Resume...
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