還元海綿鉄粉の酸化速度

概要

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Kinetic studies of the re-oxidation of the sponge-iron powders reduced in the temperature range 400 to 800℃ from ferric oxides and Brazilian iron-ores have been carried out at various partial pressures of oxygen in the temperature range 300 to 800℃. The characteristics of the sponge-irons during oxidation have been determined by means of four methods (gravimetric, microscopic examinations, X-ray diffraction and surface area measurements). Following results were obtained. 1) Oxidation of sponge-irons proceeds very rapidly by exposure to oxidizing atmosphere and then proceeds slowly. The latter obeys logarithmic law. 2) As those sponge-irons are oxidized, their specific surface areas increase and then decrease gradually. 3) The structure of the oxide layers are examined by X-ray diffraction ; generally, magnetite is observed as a main component, accompanying small amounts of hematite. 4) The early rapid re-oxidation is regarded as gaseous diffusion control and latter slow oxidation obeys the logarithmic oxidation law.
社団法人日本鉄鋼協会の論文
1970-05-01