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| Comparison of sintering performance of typical specular hematite ores with distinct size distributions |
| Cong-cong Yang1,2,De-qing Zhu1,Ben-jing Shi1,Jian Pan1,Li-ming Lu2,Xiao-bo Li3,Ya-ping Mo4 |
1 School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, China
2 CSIRO Mineral Resources, Brisbane QLD 4069, Australia
3 Products & Technique Management Department, Baosteel Zhanjiang Iron and Steel Co., Ltd., Zhanjiang 524000, Guangdong,China
4 Ironmaking Plant, Wuhan Iron and Steel Company Limited, Wuhan 430083, Hubei, China |
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Abstract The sintering performance of three typical specular hematite ores (coarse SO-A, intermediate SO-B and ultrafine SO-C) was compared in an industrial ore blend through pilot-scale sinter pot tests. The effect of particle size of specular hematite ores on their granulation and sintering performance was revealed. Compared with the coarse SO-A fine and ultrafine SO-C concentrate, the intermediate SO-B showed inferior granulation and sintering performance characterized with poorer bed permeability and productivity, lower sinter strength and higher fuel rates. A new material preparation method was hence proposed and verified at both pilot and industrial scales. The proposed method by mixing SO-B with a high amount of goethite-type iron ore fines was found to be an effective way in improving the granulation and assimilative characteristics of ore blend comprising 31% intermediate SO-B, leading to improved sinter productivity and lowered fuel rates. The metallurgical properties and microstructure of sinters were also investigated. The sinters obtained through the proposed preparation method were generally stronger and more reducible on account of better sinter structure with more relict hematite ultimately connected with needle-like silico-ferrite of calcium and aluminum and lower porosity.
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Received: 27 October 2016
Published: 18 October 2017
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2017, Vol. 24 
