Selectivity of microwave energy consumption in the reduction of Fe3O4 with carbon black in mixed powder
Selectivity of microwave energy consumption in the reduction of Fe3O4 with carbon black in mixed powder
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DOI：
10.2355/isijinternational.47.811
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
Nagata, Kazuhiro
中科院分区：
文献类型：
--
作者：
Ishizaki, Kotaro;Nagata, Kazuhiro
本文采用2.8kW、2.45GHz的恒定微波功率源对磁铁矿和炭黑的混合粉末进行辐照。测量温度作为从220 ℃开始的照射时间的函数。在400- 1200 ℃范围内的不同温度下，通过对反应产物的XRD分析来检查还原的进程。在目前的实验条件下，磁铁矿选择性地吸收低于约650摄氏度的微波能量;同时，炭黑在整个温度范围内吸收微波能量。观察到磁铁矿还原成浮氏体从至少400 ° C的测量温度开始发生，但在混合物内部不均匀地发生。在800 ℃时，反应混合物中的浮氏体开始还原为铁，并且几乎均匀地发生在反应混合物中。本工作的一般结论是，微波被吸收最高微波功率的材料吸收并在其路径中被辐射物质使用。
In the present work, mixtures of magnetite and carbon black powers were irradiated by a constant microwave power supply of 2.8kW at 2.45GHz. The temperature was measured as a function of the irradiation time from 220 degrees C. The progress of the reduction was examined by XRD analyses of reaction products at various temperatures in the range 400-1 200 degrees C. Under the present experimental conditions magnetite selectively absorbs microwave energy below approximately 650 degrees C; meanwhile carbon black absorbs it in the whole temperature range. The reduction of magnetite to wustite was observed to occur from at least a measured temperature of 400 degrees C but did not occur homogenously inside the mixture. At 800 degrees C, the reduction of wustite to iron started and occurred almost homogeneously inside the reacting mixture mass.A general conclusion of this work is that microwaves are absorbed and used in their path within the irradiated mass by the material of highest absorbing microwave power.