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| Selection of PMC ore size, preheating and roasting process parameters for pelletizing |
| LU Jian-guang1,2, LIU Xiao-jie3, LÜ Qing3 |
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China;
2. Hansteel Company, HBIS Group, Handan 056000, Hebei, China;
3. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, Hebei, China |
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Abstract In order to promote the efficient utilization of PMC ore powder, the effects of particle size, preheating, and roasting temperature of PMC ore powder on the compressive strength, reduction index, reduction degradation index, swelling rate, drum strength, porosity, and softening-melting properties of pellets were studied. The results indicate that, with the increase of preheating and roasting temperature, the compressive strength, reduction index, drum strength and softening-melting properties of pellets are improved, and the change of reduction degradation index is small; with the increase of roasting temperature, the swelling rate increases first and then decreases, and the porosity decreases; with the increase of preheating temperature, the swelling rate of No.1 pellets decreases, while the swelling rate of No.2 pellets increases slightly; with the increase of preheating temperature, the porosity of two kinds of PMC pellets first decreases and then increases, and the porosity is the lowest when preheating temperature is 950 ℃. According to the above research results, the best process parameters are determined by the weighted grey correlation method: the particle size of No.1 PMC, the preheating temperature is 925 ℃, and the roasting temperature is 1 300 ℃.
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Received: 17 February 2020
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2020, Vol. 55 
