Strengthening granulation behavior of specularite concentrates based on matching of characteristics of iron ores in sintering process

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Abstract Specularite concentrates have advantages of high ferrous grade, less harmful impurities and low price. However, the small size and poor granulation behavior of specularite concentrates could consequently deteriorate the permeability of sinter bed and reduce the productivity of sinter, resulting in un-effectively utilizing in sintering process. In this paper, granulation experiments were carried out when specularite concentrates matched with five kinds of fine or coarse ores, and the effects of surface property and wettability of fine or coarse ores on granulation behavior of specularite concentrates were investigated. Then the optimized ore blending recipes were proposed to strengthen the granulation behavior of specularite concentrates. Results can be summarized as follows. The growth index increased with increasing the specific surface area of fine ores, and had a positive linear correlation with the circularity degree of coarse ores. In addition, it was found that there were negative correlations between the growth index and the contact angle of fine or coarse ores. Compared to the scheme of blending ores containing 15 mass% specularite concentrates, the growth index increased by approximately 22 % in the case of using Ore-A and Ore-E with greater surface property and higher wettability to replace all of Ore-B and half of Ore-D respectively. Furthermore, the vertical sintering speed and the productivity of sinter improved by approximately 23 % and 20 %. This study could be beneficial to effectively use of the specularite concentrates in sintering process.

Key words�� Iron ore sinter Granulation behavior Specularite concentrate Surface property Wettability.

Received: 25 July 2017 Published: 14 November 2018

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	Articles by authors
	WU Qing-Li
	QUE Zhi-Gang
	LI Kai-Lang

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WU Qing-Li,QUE Zhi-Gang,LI Kai-Lang. Strengthening granulation behavior of specularite concentrates based on matching of characteristics of iron ores in sintering process[J]. Journal of Iron and Steel Research International, 2018, 25(10): 1017-1025.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2018/V25/I10/1017

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