硫化第一鉄の酸化に於ける自触過程について

• 資料種別: 記事
• タイトル: 硫化第一鉄の酸化に於ける自触過程について
• 著者・編者: 龜田 満雄; 矢沢 彬
• 著者標目: 龜田 満雄; 矢沢 彬
• タイトル（掲載誌）: 東北大学選鉱製錬研究所彙報
• 巻号年月日等（掲載誌）: 7(1・2) 1951.10
• 掲載巻: 7
• 掲載号: 1・2
• 掲載ページ: 61～67
• 掲載年月日（W3CDTF）: 1951-10
• ISSN（掲載誌）: 0040-876X
• ISSN-L（掲載誌）: 0040-876X
• 出版事項（掲載誌）: 仙台 : 東北大学選鉱製錬研究所
• 出版地（国名コード）: JP
• 本文の言語コード: jpn
• NDLC: ZP41
• 対象利用者: 一般
• 所蔵機関: 国立国会図書館
• 請求記号: Z17-359
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館雑誌記事索引; https://ndlsearch.ndl.go.jp
• 書誌ID（NDLBibID）: 10000624; http://id.ndl.go.jp/bib/10000624
• 整理区分コード: 632

• 要約等: application/pdf; In the reaction expressed by solid_1+gas_1=solid_2+gas_2,e.g., the roasting reaction of sulphide ores, the diffusion rate of gas has commonly been regarded as the rate-determining step. But this does not seem to be always true, especially in the initial stages of the reaction. According to Langmuir, there should be no reaction between gas_1 and solid_1,if there were no trace of solid_2 present. He assumes, however, that in this case, gas_1 would be slowly adsorbed by solid_1,and gradually nuclei would develop. This initial slowness to react may be called the "induction period". The phase boundaries thus formed would cause an autocatalytic acceleration in reaction, and a maximum value in reaction rate is passed through in the course of the reaction (Fig.1). In view of deficiency in compilation of studies concerning the autocatalytic reaction, the literatures in this field were collected and summarized by the authors, and the present oxidation reaction of ferrous sulphide was thereby explained. Kinetics of oxidation of artificial ferrous sulphide was studied by means of a flow method. 100 mg of granular sample was oxidized with abundant supply of air, and the initial stage of the present reaction was found to be clearly autocatalytic. The reaction rate increased remarkably with increasing fineness of sulphide particles (Fig.2); when the average diameter of sulphide particles in a constant weight was increased by twofold, the initial reaction rate increased fourfold. This result seems to be explained by the theory of adleneation. The reaction rate also increased with increasing temperature, and it was evident that the decrease in temperature intensified the autocatalytic nature of the sulphide, while the increase in temperature enfeebled it (Fig.3). Perhaps this is because the rates of formation and propagation of nuclei change with temperature. When some reaction nuclei had been formed previously on the sulphide particles by a separate short-period oxidation, the reaction rate of subsequent oxidation showed a remarkable increase. But this acceleration in rate diminished with the increase in temperature of subsequent oxidation (Fig.3). It also depended upon the conditions of pretreatment ; the lower the temperature of pretreatment was, the more remarkable the acceleration was (Fig. 4). Even an extremely faint pre-oxidation caused an appreciable acceleration in subsequent oxidation and the reaction rate increased up to a certain constant value with increasing sulphur amount reacted in pretreatment (Fig.5).; 紀要類(bulletin); 781526 bytes
• 作成日（W3CDTF）: 2008-05-02
• 関連情報（URI）: http://hdl.handle.net/10097/32069; https://tohoku.repo.nii.ac.jp/records/49863; http://id.ndl.go.jp/bib/10000624; https://ndlsearch.ndl.go.jp/books/R000000004-I10000624
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; CiNii Articles
• 書誌ID（NDLBibID）: 10000624; http://id.ndl.go.jp/bib/10000624
• NII論文ID: 110000589007