Carbon Dissolution Behaviors in MO(M=Ca, Ba)–B₂O₃ Slags

Abstract

Carbon is known to dissolve into slag as carbide ion (C₂^2-) under a low oxygen partial pressure. In order to clarify these mechanisms of carbon dissolution, carbon solubility was measured both in acidic and basic slags under various oxygen partial pressures and temperatures. In basic slags, carbon solubility in MO(M=Ca, Ba)–B₂O₃ slags decreased with increasing the oxygen partial pressure and increased with increasing basicity confirming the carbide ion formation mechanism. But in acidic slags, carbon solubility in MO(M=Ca, Ba)–B₂O₃ slags decreased with increasing basicity and oxygen partial pressure. In order to explain these phenomena, the probable mechanism was discussed and suggested on the basis of experimental results. The model of nitrogen dissolution into slag was compared to that of carbon dissolution to find similar effects of basicity on the dissolution behaviors.