溶銑予備処理用ソーダ系スラグによる耐火物の侵食(耐火物)(<特集>溶銑処理の発展)

概要

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The corrosion of refractories by molten soda-based slag was studied by rotating cylindrical polycrystalline specimens (φ20×35mm) in a stationary crucible containing the slag melt prepared with mixture of Na_2CO_3 and SiO_2 at 1400℃. Alumina, spinel, and magnesia specimens had good corrosion resistances as compared with other specimens, especially alumina was independent of the composition of melts, while magnesia was affected by that. Zircon, mullite, carbon and silicon carbide specimens were extremely corroded for slags more than Na_2CO_3/SiO_2 mol ratio 2. The quantity of dissolution of alumina specimen estimated from the decrease in its diameter was dependent on both the dipped time and the speed of rotation of specimen in the slag of mol ratio 3. It was also remarkably accelerated as the temperature of slag increased. Activation energy for the dissolution was estimated to be about 28 kcal/mol. Its corrosion in ternary slag decreased with increase in P_2O_5 content of Na_2CO_3-SiO_2-P_2O_5 melts. Therefore, it is shown that the process of corrosion of alumina specimen in soda-based slag within the range of this experiment is controlled by the diffusion of reaction product in the liquid boundary layer.
社団法人日本鉄鋼協会の論文
1983-11-01