Influence of Gangue Composition on Melting Behavior of Coal-Reduced Iron Mixture
Influence of Gangue Composition on Melting Behavior of Coal-Reduced Iron Mixture
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DOI：
10.2355/isijinternational.44.2105
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发表时间：
2004-12
影响因子：
1.8
通讯作者：
T. Matsui;N. Ishiwata;Yoshiaki Hara;K. Takeda
中科院分区：
文献类型：
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作者：
T. Matsui;N. Ishiwata;Yoshiaki Hara;K. Takeda
利用激光显微镜观察了铁矿石颗粒在石墨粉上的低温还原熔融行为。根据还原过程中脉石的行为将铁矿石分为两类。一个形成脉石集中层，另一个不形成。有脉石富集层的铁矿石熔化起始温度高于无脉石富集层的铁矿石熔化起始温度。在有脉石富集层的情况下，形成的脉石层阻止了还原铁与石墨的接触，其熔化起始温度远高于Fe-C二元系的共晶温度。CaCO_3包覆的矿粒由于包覆层的存在，促进了脉石富集层的熔化，降低了矿石的起熔温度，这一结果通过对含碳复合铁矿石的高温软化和熔融特性的测定得到了证实，还原铁与碳的直接接触对铁矿石的低温熔化至关重要。选择无脉石富集层的铁矿石，在有脉石富集层的铁矿石中加入助熔剂，有助于降低熔化温度。
Iron ore particles on the graphite powder were observed by laser microscope to study low temperature reduction and melting behavior. The iron ores were classified two types by the gangue behavior through the reduction process. One forms a gangue concentrated layer and the other does not. Melting start temperature of iron ores with the gangue concentrated layer was higher than that of without. In the case of the iron ores with gangue concentrated layer, the formed gangue layer prevents the reduced iron from contacting with graphite, and the melting start temperature was much higher than the eutectic temperature of the Fe-C binary system. The melting start temperature was lowered for the ore particle coated with CaCO3 as the coated layer enhances melting of the gangue concentrated layer.These results were confirmed by measurement of the softening and melt-down properties of the carbon composite iron ore briquette at a high temperature under-load test.The direct contact of reduced iron with carbon is most important for the low temperature melting of iron ore. The selection of iron ore without gangue concentrated layer, flux addition to the iron ore with gangue concentrated layer will contribute to lowering the melt down temperature.