1970 Volume 56 Issue 12 Pages 1447-1455
The rate of reduction of silica in CaO-Si02 and CaO-Al203-Si02 slags by carbon in liquid iron was measured under various experimental conditions to examine effects of slag composition, temperature, atmosphere and slag graphite interfacial area.
Effect of slag composition was ascribed to the change of activity of silica. Apparent activation energies were about 100kcal/mol for binary slags and 70-85kcal/mol for ternary slags.
The rate of reduction increased linearly with the ratio of slag-graphite to slag-metal interfacial area in the low ratio region. It suggests that reaction of silica reduction proceeds electrochemically, and that interfacial reaction is the rate-determining step.
The rate of reduction in argon atmosphere was about twice as fast as that in CO atmosphere.