Effect of additives on coke metallurgical property and sulfide phase

The effect of metallurgical property of coke and the formation of sulfide phase added with CaO, Fe₂O₃ and La₂O₃ have been investigated using contrast test and XRD phase analysis. The results indicate that additives have little impact on coke dropping broken strength, but the wear strength of coke is deteriorated with CaO and Fe₂O₃ addition and improved with La₂O₃. The coke reactivity is increased with CaO and Fe₂O₃ addition and the coke strength after reaction is reduced. The additive La₂O₃ could improve the wear strength of coke but little impact on the reactivity and strength after reaction of coke. The sulfide phase in coke is mainly CaS and the additives of Fe₂O₃ and La₂O₃ have a good promotion action on the CaS phase formation in the coking process.