黄鉄鉱の酸化反応生成物に関する研究

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書誌事項

タイトル別名
  • Studies on the Oxidation Products of Pyrite
  • オウテッコウ ノ サンカ ハンノウ セイセイブツ ニ カンスル ケンキュウ
  • 酸化反応生成物の磁気的性質
  • Magnetic properties of the oxidation products

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抄録

The properties of the oxidation products of pyrite, above all, the composition of FeS1+x formed at the intermediate stage of the oxidation and the conditions of formation of Fe3O4, were investigated by the methods of measurement of the relative intensity of magnetization, thermomagnetic analysis, and X-ray. Results obtained were summarized as follows;<BR>(1) The intensity of magnetization of the products increases along the oxidation, reaching at its; maximum value in its way, and after then, it dereases. In the atmosphere whose partial pressure of oxygen is 0.01 atm., this maximum value is remarkably higher than that of the oxidation products, which were formed in the atmosphere whose partial pressure of oxygen is above 0.01 atm.<BR>(2) This maximum of the intensity of magnetization was found, by thermomagnetic analysis and X-ray measurement, to be caused mainly by the formation of Fe3O4. In the oxidation in the atmosphere whose partial pressure of oxygen is 0.01 atm., it was found that Fe3O4 was stable just to the end of the oxidation and Fe2O3 was formed abruptly at the end of the oxidation. On the contrary, in the atmosphere of more than 0.03 atm. of oxygen, Fe2O3 and small amount of Fe3O4 was found, to be formed at the comparatively initial stage of the reaction.<BR>(3) FeS1+x formed at the intermediate stage of the oxidation was certified as a ferromagnetic one, and its composition is near the upper limit of solubility of sulphur in FeS1+x.<BR>(4) From above-mentioned results of studies, the mechanism of the oxidation in a layer of fineparticles of pyrite was considered. According to Niwa and Tohata, the oxidation in the layer of fine: particles of pyrite proceeds from the surface towards the interior. Therefore, the partial pressure of oxygen decreases along this way and the layers of the oxidation products after the thermal decmposition are arranged from the surface as follows; Fe2O3, Fe3O4, FeS1+x. From the results of (1) and (2), it may be said that in the oxidation at low partial pressure of oxygen in the atmosphere, among, these layers of oxidation products, the Fe304 layer becomes much thicker in the intermediate stage of the reaction.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 74 (846), 1022-1028, 1958

    一般社団法人 資源・素材学会

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