Abstract: An improved method of optimum burning of carbon monoxide in a carbon monoxide zone (being fed oxygen by a side tuyere) above a molten metal bath in a converter to carbon dioxide is disclosed.The improved method includes the steps of:A. sensing an initial effectiveness signal of the amount of carbon monoxide in the carbon monoxide zone being burned to carbon dioxide at a predetermined point relative to the converter;B. monitoring a continuing effectiveness signal;C. comparing the continuing effectiveness signal with the initial effectiveness signal; andD. moving the side tuyere relative to the converter and adjusting O.sub.2 flow when all possible side tuyere positions are exhausted when the continuing effectiveness signal is greater than the initial effectiveness signal to increase the amount of carbon monoxide in the carbon monoxide zone being burned to carbon dioxide.

Abstract: A method of oxygen refining molten hot metal to steel by blowing an oxygen stream at a predetermined flow rate from an oxygen supply source having a pressure from about 12 to about 18 atmospheres through the molten hot metal from a tuyere located beneath the surface of the molten hot metal and having a tuyere inlet and by varying the rate of flow of a finely divided lime injected into the oxygen stream is disclosed.