Reduction of Iron Oxides with Use of Microwave Heating

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The main results of this research are as floows.1.Several methods for temperature measurement during microwave heating were examined. Temperature measurement was possible by the thermocouple with the ground. Without carbon, it was not so easy for materials temperature to rise.2.Carbothermic reduction of iron oxide with use of microwave heating(1) In the case of (Fe_2O_3 : C=4 : 1), the less amount of sample was, the faster the reduction rate became, the higher the final fractional reduction was and the higher the sample temperature rose.(2) The higher the microwave power was added, the faster the reduction rate became and the higher the final fractional reduction was. In the case of the power 500W,the lager the amount of carbon was, the faster the reduction rate became and the higher the final fractional reduction was. On the other hand, in the case of the power 700W,the larger the amount of carbon was, the slower the reduction rate became and the lower the final fractional reduction was.(3) When the shape of the sample was briquette and the heating time was lengthened for 30 minutes, the reduction rate became slower and the final fractional teduction was also lower compared with the results in powder sample.3.Comparing with the reduction by external heating method, the temperature of the sample rose only up to about 900-1000ﾟC in spite of increase of microwave power because of the Boudouard reaction. However, the heating rate was faster and final fractional reduction became higher with an increase of the microwave power.