Gas Evolution during Mechanical Milling of Hematite-Graphite Mixture
Gas Evolution during Mechanical Milling of Hematite-Graphite Mixture
复制标题
赤铁矿-石墨混合物机械研磨过程中的气体逸出
DOI：
10.2355/isijinternational.44.1970
复制
发表时间：
2004
影响因子：
1.8
通讯作者：
K. Ishii
中科院分区：
文献类型：
--
作者：
Y. Kashiwaya;H. Suzuki;K. Ishii
在以前的研究中，通过机械研磨获得的赤铁矿-石墨混合物的反应性进行了研究。随着球磨时间的延长，反应速率显著提高，反应起始温度降低。了解球磨过程中的现象及其机理，有助于开发新的炼铁喂入材料。在这项研究中，赤铁矿和石墨的混合物进行了研磨与相同的程序。通过QMS进行气体分析，以定性和定量地澄清研磨过程中产生的气体。从石墨中放出的气体主要是CO气体。在球磨早期也有CO2气体生成.这些气体与研磨前的吸附气体有关。在球磨过程中暴露于空气中时，大量的气体吸附在球磨石墨表面，并随着球磨时间的延长而增加。当赤铁矿和石墨混合物在氩气气氛下研磨时，由于还原反应，主要产生CO气体。根据气体分析结果，提出了球磨过程中气体析出的机理。
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. CO 2 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.