Mechanism of growth of metallic phase in direct reduction of iron bearing oolites
Mechanism of growth of metallic phase in direct reduction of iron bearing oolites
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DOI：
10.1007/bf02670207
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发表时间：
1986-09
期刊：
影响因子：
--
通讯作者：
S. Weissberger;Y. Zimmels;I. Lin
中科院分区：
文献类型：
--
作者：
S. Weissberger;Y. Zimmels;I. Lin
氧化物的直接还原涉及金属相随温度的逐渐生长。在1100 °C下观察到颗粒尺寸增加两个数量级，随后在1250 °C下形成连续的金属相。确定了两种生长机制：低于1050 °C时颗粒粗化，高于1050 °C时形成富磷铁熔体。结果表明，颗粒粗化可能与不同尺寸颗粒之间形成铁橄榄石和铁铝尖晶石桥有关。最后，直接还原和生长机制相关的鲕粒内壳结构，针铁矿颗粒的间距，孔含量和尺寸分布，使用电子显微镜，压汞法，和图像分析。
The direct reduction of oolites involves progressive growth of the metallic phase with temperature. Two orders of magnitude increase in particle size are observed at 1100 °C followed by the formation of a continuous metallic phase at 1250 °C. Two growth mechanisms were identified: below 1050 °C particle coarsening, and above 1050 °C the formation of phosphorus rich iron melt. It is shown that particle coarsening can be related to the formation of fayalite and hercynite bridges between particles of different sizes. Finally, the direct reduction and growth mechanisms were correlated to the oolite internal shell structure, spacing of goethite particles, and pore content and size distribution, using electron microscopy, mercury porosimetry, and image analysis.