溶鉄の純酸素による酸化速度

概要

論文の詳細を見る
The rate of oxidation of liquid iron by oxygen gas has been studied using a volume constant technique. The process of oxidation consists of two stages of very rapid oxidation in the early stage and relatively slow oxidation in the second stage after the formation of iron oxide covering the surface of melt. The rate of the dissolution of oxygen into the melt was studied under the presence of three phases of gas, liquid oxide, and liquid iron to make clear the mechanism of oxidation. From the experimental results obtained, it was considered that the rate-determining step under the coexistence of three phases was the transport of solute gas through the stagnant layer in the oxide phase at the gas-oxide interface. This mechanism is supported by the following experimental facts : a) The rate of oxidation is proportional to the square root of oxygen pressure in the gas phase. b) The reaction rate decreases with decreasing the stirring of the melt. c) The rate is not influenced by the amount of oxygen and sulphur in liquid iron. The apprarent activation energy of the reaction is low, giving a value of 5kcal/mol.
社団法人日本鉄鋼協会の論文
1980-10-01