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| Kinetics of Reduction of Hematite by H2 Using Nonisothermal Thermogravimetric Method |
| PANG Jianming,GUO Peimin,ZHAO Pei,CAO Chaozhen |
| The State Key Laboratory for Advanced Iron and Steel Processes and Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Kinetics of reduction of hematite by H2 was studied using nonisothermal thermogravimetric method. The finer the particle size of hematite, the lower starting reaction temperature is. The higher reaction speed, the higher reduction rate at the stationary region is. For 3.5 mm iron oxide powder, reduction started at about 400 ℃, and accelerated from about 700 ℃, and the reduction rate at the stationary region was 77%. But for 2 μm iron oxide powder, reduction already started at about 100 ℃, and accelerated from about 350 ℃, and the reduction rate at the stationary region was 98%,and that the percent reduction rate was 100% at 600 ℃. With the particle size of hematite reducing from 3.5 mm to 2 μm, the apparent activation energy of reduction droped to 30.46 kJ/mol from 73.3 kJ/mol: the analysis showed that both inner diffusion and interface chemical reaction play important roles in whole reaction process.
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Received: 01 January 1900
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2009, Vol. 44 
