EAF process monitoring at OneSteel's Sydney Steel Mill

Monitoring was conducted at OneSteel's Sydney Steel Mill electric arc furnace to study the effect of hot briquetted iron (HBI) upon furnace performance. Results from this study have been previously published by Trotter [1]. These studies were then continued for zero HBI operation to investigate the effects of a new, more reliable coke injection system into the slag and the change from two consumable oxygen pipes to a water-cooled oxygen lance and the installation of a spray-cooled roof. The investigations were comprised of an energy balance across the furnace, foaming slag investigations with regard to thermal efficiency and acoustic noise, effect of equipment modifications on the primary fume analysis, harmonic measurement for slag foam indicator, triboelectric system for measuring off-gas dust loading. Each of these investigations is detailed in this report.