Mechanism of Dephosphorization with CaO-SiO_2-Fe_tO Slags Containing Mesoscopic Scale 2CaO·SiO_2 Particles

摘要

Dephosphorization of a liquid Fe-5mass%P alloy with a solid-liquid coexisting flux in which 2CaO·SiO_2 particles (20 to 50 μm) are uniformly dispersed in CaO-SiO_2-Fe_tO slags has been studied at 1 400℃. For the slag with high SiO_2 and low T.Fe contents, the change of slag composition is small and the fraction of 2CaO·SiO_2 particles to slag increases slightly during dephosphorization in which the L_p~(solid/slag) and L_p~(slag/metal) values are low. For the slag with moderate SiO_2 and high T.Fe contents, the change of slag composition is considerable and the fraction of 2CaO·SiO_2 particles to slag increases considerably during dephosphorization in which the L_p~(solid/slag) and L_p~(slag/metal) values are high at initial period, but these values decrease with time. For the slag with low SiO_2 and high T.Fe contents, the change of slag composition is small and the fraction of 2CaO·SiO_2 particles to slag decreases slightly during dephosphorization in which the L_p~(slag/metal) and L_p~(solid/slag) values are high, but L_p~(solid/slag) value decreases considerably even with small change of slag composition.