抄録
A kinetic study has been made on reactions between the alumina graphite refractory containing SiO2 and molten steel by measuring mass losses of the refractories heated at 1100-1600°C and Si contents of molten steel immersing the refractories in at 1600°C.
The results are summarized as follows.
1) Rate of reaction in the refractory, namely carbothermic reduction rate of SiO2, is controlled by the diffusion of SiO and CO gases through refractory pores.
2) Rate of reaction between the refractory and molten steel is controlled by the diffusion of SiO and CO gases through oxide layer formed at refractory-molten steel interface.
3) Rate of reaction between the refractory and Ti killed steel is higher than that of reaction between the refractory and Al killed steel. This is because gas permeability of oxide layer formed at refractory-Ti killed steel interface is higher than that at refractory-Al killed steel interface.
