RATES OF CARBON TRANSFER FROM SOURCES INJECTED INTO Fe-C-S MELTS

摘要

1. A deficiency of the previous liquid-side mass transport model in predicting carbon dissolution into liquid melts containing sulfur, may be due to gas-liquid interface limitation. This view was supported by experimental results of injection trials conducted at higher feed rates than previously studied.rn2. A model based upon a first-order rate equation was found to be consistent with experimental data. This model agreed with the measured variation of carbon content with time in melts containing sulfur. The rate equation was applicable for all the carbon sources examined.rn3. The interfacial rate constants were derived from data measured at high coal injection rates in which the rate of carbon dissolution was independent of the injection rate. The rate constants increased with decreasing melt sulfur contents. This is consistent with the earlier observations on the sensitivity of coal dissolution to sulfur.rn4. Each carbon source studied had a characteristic rate constant and sensitivity to bath sulfur.rn5. A mechanism dictating the dissolution kinetics of carbon from non-graphitic sources into Fe-C-S melts has been proposed. The proposed mechanism is supported by experimental results.