The effect of oxygen/argon mixing ratio in thebottom blowing gas on the decarburization behaviour of highcarbon ferromanganese melt was investigated in thetemperature range of 1350 - 1550 deg C. Thermodynamicanalysis indicates that high melt temperature and low P_(CO)are essential for an effective decarburization. An empiricalequation for the utilization ratio of oxygen for decarburizationwas derived as functions of the melt temperature and theoxygen/argon mixing ratio in the refining gas. The utilizationratio of oxygen for decarburization sharply increases as themelt temperature increases and the oxygen ratio in blowing gasdecreases. In oxygen refining of high carbon ferromanganesemelt, it is not desirable to inject oxygen through bottom tuyèresin an early stage of refining. When the melt temperature is low,the oxygen predominantly oxidizes the manganese in melt inspite of high carbon contents. The injection of oxygen/argonmixture gas is found to be an effective decarburizationtechnique when the melt temperature is higher than 1500 deg C.
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