Comparison of sintering performance of typical specular hematite ores with distinct size distributions

IF 3.1 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-10-01 DOI:10.1016/S1006-706X(17)30147-4

Cong-cong Yang , De-qing Zhu , Ben-jing Shi , Jian Pan , Li-ming Lu , Xiao-bo Li , Ya-ping Mo

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引用次数: 4

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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不同粒度分布的典型镜面赤铁矿烧结性能比较

摘要通过中试烧结罐试验，比较了三种典型镜面赤铁矿(粗粒SO-A、中粒SO-B和超细粒SO-C)在工业配矿中的烧结性能。揭示了镜面赤铁矿粒度对其造粒和烧结性能的影响。与粗质SO-A、细质SO-C和超细质SO-C精矿相比，中间体SO-B的造粒和烧结性能较差，床层渗透性和生产率较差，烧结强度较低，燃料率较高。因此提出了一种新的材料制备方法，并在中试和工业规模上进行了验证。将SO-B与大量针铁矿型铁矿粉混合的方法可以有效地改善含有31%中间SO-B的混合矿的造粒和同化特性，从而提高烧结矿生产率，降低燃料利用率。研究了烧结矿的冶金性能和显微组织。该方法制备的烧结矿结构较好，残余赤铁矿较多，最终与钙、铝的针状硅铁氧体连接，孔隙率较低，烧结矿强度大，还原性好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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