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Effect of Mixing Pre-heated Water on Granulation and Iron Ore Sinter Properties

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Abstract

Granulation of sinter feed mix is one of the most important factors in determining the permeability of sinter bed and sinter properties like sinter yield, tumbler index, etc. To improve the granulation of sinter feed mix, various technologies like two-stage granulation process, coating granulation process, wet vertical ball mill and use of magnetic water have been reported. In this paper, effect of pre-heated water (30, 60 and 90 °C) on granulation fitness of sinter feed mix was studied using a laboratory mixing drum. Sinter properties were investigated using pot sinter experiments. It was observed that with addition of pre-heated water, granulation fitness i.e., Balling index (BI) and Granulation index (GI) has increased, indicating that wetting of sinter feed mix has improved significantly. Treatment of sinter feed mix with pre-heated water reduces the surface tension of water and improves slaking of lime. This enables improved binding of the small size faction (− 0.25 mm), leading to stronger green ball which results in reduced fine generation during charging to the sinter bed. This further leads to the improvement in bed permeability and sinter properties. Enhanced hydration of lime and improved dispersion of water thus achieved have benefitted granulation fitness (GI increases by 5.3% and BI increases by 9.7%). Sinter yield increases by 2.1% and tumbler index by 1.6%. The results suggest that the proposed methodology is effective in improving the granulation fitness of sinter feed mix and sinter properties.

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Acknowledgements

The authors are grateful to the management of JSW Steel, Dolvi for the encouragement and support of this work.

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Authors and Affiliations

  1. Research and Development Department, JSW Steel, Dolvi, Maharashtra, 402107, India

    Dharmendra Kumar Rajak, Mrigandra Singhai, Rupram Sahu & Sujoy S. Hazra

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  1. Dharmendra Kumar Rajak
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  2. Mrigandra Singhai
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  4. Sujoy S. Hazra
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Correspondence to Dharmendra Kumar Rajak.

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Rajak, D.K., Singhai, M., Sahu, R. et al. Effect of Mixing Pre-heated Water on Granulation and Iron Ore Sinter Properties. Trans Indian Inst Met 74, 1611–1622 (2021). https://doi.org/10.1007/s12666-021-02251-4

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