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| Effect of Gradually Temperature Rising and Reduction of Ore in Lumpy Zone on the Permeability |
| ZHAO Hong-bo1,CHENG Shu-sen1,BAI Yong-qiang1,MA Jin-fang1, 2,WAN Lei2,WANG Wei-ping2 |
1. Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China
2. Ironmaking Works, Shougang Qiangang Co., Ltd., Qian’an 064404, Hebei, China |
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Abstract To simulate the effect of iron ore reduction in lumpy zone on the permeability of stock column in BF, the experimental methods were designed according to the actual movement of burden, temperature distribution and gas compositions. The equipments were built which could monitor the pressure drop of burden column and reduction index of ore at real-time. The evaluating indicators for the effects of gradually temperature rise and reduction of ore on the permeability of burden column were given. The pressure drop of burden column and the reduction index of sinter, pellet, lump ore and mixed ores were tested. It is found that the degradation index after gradually temperature rise and reduction has good correlation with the increment rate of pressure drop of burden column, which is more proper to judge the effect of ore reduction in the entire lumpy zone in BF on the permeability of burden column and to evaluate the effect of ore property on BF operation than conventional low temperature test of reduction degradation.The influences of testing factors on the ore degradation were also studied, including original particle size, weight loss by reduction, reduction temperature, reduction time, heating, drumming and soaking.
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Received: 26 November 2010
Published: 17 November 2011
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2011, Vol. 46 
