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Gas Evolution during Mechanical Milling of Hematite-Graphite Mixture

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Title: Gas Evolution during Mechanical Milling of Hematite-Graphite Mixture
Authors: Kashiwaya, Yoshiaki Browse this author →KAKEN DB
Suzuki, Hiroshi Browse this author
Ishii, Kuniyoshi Browse this author
Keywords: gas evolution
composite pellet
mechanical milling
ball milling
carbothermic reduction
Issue Date: Dec-2004
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 44
Issue: 12
Start Page: 1970
End Page: 1974
Publisher DOI: 10.2355/isijinternational.44.1970
Abstract: In previous studies, the reactivity of hematite-graphite mixture obtained by the mechanical milling was investigated. The rate of reaction has remarkably increased and the starting temperature of reaction decreased with the milling time. Understanding the phenomena and its mechanism occurring in the milling would contribute to develop the new feeding material for ironmaking process. In this study, milling of hematite and graphite mixture was carried out with the same procedure. Gas analysis by QMS was performed to clarify the evolved gas during milling qualitatively and quantitatively. Gas evolution from graphite was mainly CO gas. CO2 gas also evolved in the early stage of milling. These gases would be related to the adsorbed gases before milling. When the sample exposed to air in the course of milling, much gas adsorbed on the surface of milled graphite, which increased with the increasing milling time. When the hematite and graphite mixture was milled under argon atmosphere, mainly CO gas evolved owing to the reduction reaction. From these results of gas analysis, the mechanisms for the gas evolution during the milling were proposed.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柏谷 悦章

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