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| Effects of reducing condition on apparent porosity and metallization degree of COREX pellets |
| LIU Ying1，LI Zheng-yi1,3，DI Zhan-xia1,2，LONG Hong-ming1,2，CHUN Tie-jun1,2，WANG Ping1,2 |
（1. School of Metallurgical Engineering， Anhui University of Technology， Ma’anshan 243002， Anhui， China
2. Key Laboratory of Metallurgical Emission Reduction and Resources Utilization， Ministry of Education， Anhui University of Technology ， Ma’anshan 243002， Anhui， China
3. National Center for Materials Service Safety， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract The metallization degree of pellets is an important indicator in the COREX reduction process， and the apparent porosity of pellets after reduction significantly affects the reduction condition of pellets in COREX shaft furnaces. Effects of reducing condition on apparent porosity and metallization degree of COREX pellets were investigated under simulating load reduction of COREX， and the metallization degree and the apparent porosity of coated pellets whose surface coated the coating material after reduction， were analyzed for easing the sticking phenomenon of COREX shaft furnace. The experimental results indicate that the increase of the apparent porosity of the pellets is beneficial to the increase of the metallization degree. With the temperature increasing from 800 to 900 ℃， the metallization degree increases， at the same time the apparent porosity increases. When the volume percent of H2 in the reducing gas increases， the metallization degree and the apparent porosity of the pellets also increases. When the volume percent of H2 increases by 5%， the metallization rate increases by 2.6% after reduction. At 850 ℃， the apparent porosity and metallization degree of the reduced coating pellets which coat the light burden dolomite mix plastic with the ratio of 1[∶]1，are 53.8% and 60.2% respectively.
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Received: 26 May 2017
Published: 26 February 2018
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2018, Vol. 53 
