| An experimental study was carried out to investigate the reaction behavior of (sinter ore) and gas phase oxygens in hot metal during dephosphorization treatment using a mixture of CaO and CaF₂ as a flux. In general, the degree of dephosphorization and the partition ratio of phosphorous into the slag increased with an increase in oxygen partial pressure and markedly increased beyond Po₂=10^(-14.5). In most case, the oxygen efficiency for dephosphorization increased with an increase in basisity under the existence of oxygen. Without blowing gaseous oxygen, dephosphorization hardly occured when only the flux was added, although very high degrees of desulphurization as much as 93% was obtained. By the addition of the sinter ore together with flux, dephosphorization was much improved but little desulphurization was observed. When gaseous oxygen was injected without any addition, very low dephosphorization and desulphurization were obtained. With the addition of the flux only dephosphorization was improved and with the addition of the sinter ore together with the flux both dephosphorization and desulphurization were much improved. The temperature of the system was decreased with the addition of solid oxygen and flux, but this temperature drop could by fully compensated by keeping the gaseous oxygen rate above 50% with the injection of gaseous oxygen. |
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