Dephosphorization of Molten Iron by Sodium Carbonate and Sodium Sulfate
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Reactions of Na2CO3 or Na2SO4 with iron, and carbon and phosphorus dissolved in iron were studied in the temperature range between 1200° and 1400°C by the use of iron, graphite and magnesia crucibles. The reaction between Na2SO4 and iron was much more active than that between Na2CO3 and iron, whereas the reaction between Na2CO3 and carbon was considerably violent compared with that between Na2SO4 and carbon. Reaction of Na2CO3 or Na2SO4 with phosphorus (Fe-18%P alloy) was determined as follows; Na2CO3(l)+4/5P=Na2O(l)+2/5P2O5(l)+C Na2SO4(l)+4/5P=2/3Na2O(l)+2/5P2O5(l) +1/3Na2S(l)+2/3SO2 The dephosphorization and desulfurization of carbon-saturated iron (0.2%P, 0.05%S) by Na2CO3-Na2SO4 flux were also investigated at 1250°C. From the chemical composition of flux analyzed before and after experiments, the degree of dephosphorization and desulfurization and also evaporation loss of sodium and sulfur were obtained, being almost independent of the flux composition. With increasing Na2SO4 content, the degree of desulfurization, evaporation loss of sodium and iron yield decreased, whereas the loss of sulfur decreased with increasing Na2CO3 content. The evaporation loss of sodium decreased with increasing P2O5 content in slag.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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