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Preparation of blast furnace burdens by composite agglomeration process: effect of distribution of magnetite and hematite concentrates in pelletized and matrix feed

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Journal of Iron and Steel Research International 2020年第12期27卷 1363-1371页

作者： Fo-quan Gu Yuan-bo Zhang Guang-hui Li Qiang Zhong Jun Luo Zi-jian Su Ming-jun Rao Zhi-wei Peng Tao Jiang School of Minerals processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Effect of distribution of iron concentrates between pelletized and matrix feed on the preparation of blast furnace burdens from two different kinds of fine iron concentrates (magnetite and hematite) by composite agglomeration process (CAP) was explored. It was found that when the mass ratio of iron concentrate A (magnetite) to iron concentrate B (hematite) in the mixed feed was constant, the proportion of iron concentrate A in the pelletized and matrix feed significantly affected the quality of CAP products. Particularly, as the proportion of iron concentrate A in the pelletized feed increased from 0 to 100%, the yield decreased from 82.11% to 79.19% and the tumbler index decreased from 71.33% to 68.27%. The mineralization characterization results indicated that when 100% iron concentrate A was used as the pelletized feed, the crystallization styles of the outer layer and the inner layer of the pellet were different, and a lot of pores exist around hematite and magnetite phases in the pelletized part, with the weak connection of pelletized and matrix part, resulting in poor strength of agglomeration product.

关键词： composite agglomeration process Sintering Fine iron concentrate Pelletized feed Blast furnace burden

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Mechanisms of composite agglomeration of fluoric iron concentrate

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Journal of Central South University 2010年第6期17卷 1190-1195页

作者：姜涛胡友明李骞李光辉杨永斌张元波郭宇峰 School of Resources processing and Bioengineering Central South University

The effect of composite agglomeration process(CAP) on fluoric iron concentrates sintering was *** yield and quality of the sinter are greatly improved when using CAP assisted with heat airflow and enhancing magnesium oxide(MgO) *** conventional sintering of fluoric iron concentrate,due to lower viscosity of binding phase and higher fluidity of liquid phase,the sinter is formed with large thin-walled holes and the strength of the sinter is deteriorated *** novel process forms composite agglomerate in which acid pellets are embedded in basic *** pellets are solid with interconnecting crystals of hematite(Fe2O3) and magnetic(Fe3O4).For basic sintering,after adding MgO,the viscosity of the melting phase increases and the fluidity decreases;and calcium and aluminum silico-ferrites and magnesium ferrite are formed with perfect crystals and good sintering microstructure.

关键词： fluoric iron concentrate sintering composite agglomeration process mechanism

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