The converter gas referred to here is recovered as a recyclable waste, collected and processed for internal use within the steel plant. During the converter steelmaking process, carbon in molten iron reacts at high temperatures with oxygen blown into the furnace, generating a mixture of carbon monoxide and a small amount of carbon dioxide. Recovered oxygen-top-blown converter gas contains 60–80% carbon monoxide, 15–20% carbon dioxide, as well as nitrogen, hydrogen, and trace oxygen. The generation rate and composition of converter gas vary during a single refining cycle. Therefore, the gas recovered from multiple converter cycles is typically fed into a gas holder, blended to achieve uniformity, and then supplied to end users. The average heating value is approximately 8,400 kJ/m³.
