還元鉄鉱石の還元率迅速測定方法

Abstract

In the experiment on the continuous redcution of iron ore, a rapid determination of the reduction rate became necessary. Instead of the existing method based on the determination of metallic and total irons, a new method which determines the residual oxygen in the reduced iron ore has been studied. From fundamental experiments, the authors recommend the following procedure: The reduced iron ore wrapped in a tin sheet is put into a graphite crucible which is heated in argon atmosphere at 1900°C. The proceeded carbon monoxide is oxidized by iodine pentoxide and absorbed into a barium hydroxide solution. The change in electric conductivity of the solution is measured and the oxygen content in the sample is determined with the calibration curve. For the separate determination of oxygen in iron oxide, silicon dioxide and aluminum oxide, the crucible is heated at 1400°, 1600° and 1900°C, respectively. The time required for the analysis is about ten minutes for total oxygen and about thirty minutes for oxygen in each of the above three oxides.