MgO 焼結体の溶融 Fe_tO-CaO-SiO_2 系スラグへの溶解速度

概要

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The sintered MgO (porosity 29.9% and 13.0%) was immersed into molten Fe_tO-CaO-SiO_2 slags at temperatures from 1350 to 1425℃ and the dissolution rate of MgO was determined with the rotating cylinder method by measuring the decrease of the cylinder radius. Also, the section of the MgO cylinder after immersion was examined by EPMA to know the penetration of slag and the dissolution mechanism. The results obtained are as follows : (1) The dissolution rate of MgO was increased with the rotating speed of cylinder and with temperature, and was found to be controlled by mass transport in the boundary layer of molten slag. (2) The change of mass transfer coefficient at 1400℃ with slag composition was correlated well to the change of kinematic viscosity of slag. Utilizing the nondimensional correlation found in literature, the values of diffusion coefficient of MgO into molten slags were estimated to be 1.0×10^<-5>∿3.0×10^<-5> cm^2/s at 1400℃. (3) The dissolution of MgO proceeded through the formation of (Fe, Mg)O solid solution layer at the interface and its dissolution. The penetration of slag was retarded by this dense (Fe, Mg)O layer and the depth of penetration after 5∿60min was only 1∿3mm in high porosity MgO and <1mm in low porosity MgO.
社団法人日本鉄鋼協会の論文
1981-08-01