Carbothermal recovery of zinc from brass ash

Abstract

Brass ash of composition (wt-%) 59·67Zn-9·22Cu-1·45Pb-2·61SiO₂-0·36Cl was treated by carbothermal reduction in a temperature controlled tube furnace. The aim of the work was to collect zinc in the form of metal and/or zinc oxide in the gaseous phase. Treatment temperature (950-1200°C) and time (15-180 min) were varied. At 1200°C and 60 min, recovery of zinc was 92·5% and zinc content in the remaining residue was found to be 12·8 wt-%. Kinetic analysis of the experimental results showed that initially the reaction was under chemical control with an activation energy of 90·1 kJ mol^-1. Subsequently the development of a sintering structure caused the reaction mechanism to change to diffusion control.

Keywords

PYROMETALLURGY BRASS ASH CARBOTHERMAL REDUCTION ZINC RECOVERY

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