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| Interaction between sinter and lump during softening and melting process |
| LIU Xin-liang1,2, HONEYANDS Tom1, O′DEA Damien3, MITRA Subhasish1, CHEN Jeff4, QIU Guang-jun2 |
1. Australian Research Council Research Hub for Advanced Technologies for Australian Iron Ore, The University of Newcastle, NSW 2308, Australia
2. Marketing Iron Ore, BHP, Shanghai 200021, China
3. Marketing Iron Ore, BHP, Brisbane 4000, Australia
4. Centre for Advanced Microscopy, The Australian National University, ACT 2601, Australia |
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Abstract The main purpose is to better understand the softening and melting (S&M) behaviour of lump in the blast furnace (BF) and how to optimise its use with sinter. As the only ferrous burden material that can be directly charged into the BF, the lump is more environmentally friendly and economically effective than sinters or pellets. Despite this, the lump utilisation in China is lower than that in other countries such as Japan. One of the main concerns is the perception that the S&M properties of individual lump samples are not as good as those of sinter or pellet. However, it has been shown that the high temperature interaction between sinter and lump can largely improve the S&M behaviour of a mixed burden composed of sinter and lump. Both the chemical and physical interaction between a basic sinter and the Newman Blend Lump (NBLL) from Australia were studied using the S&M under load test and the tablet analogue test. The physical interaction was examined using Neutron Computed Tomography scanning on the samples from interrupted S&M under load tests. The void fraction in the ferrous layer of the sinter-NBLL mixture at 1 450 ℃ was found to be higher than that for either the sinter or NBLL only burdens. The chemical interaction was studied using SEM and EPMA, which showed that the Ca and Mg diffused from the basic sinter to neighbouring lump ore particles during the S&M process in the temperature range from 1 200 to 1 300 ℃. Significant improvements were found in the S&M behaviour of a mixed burden with about 20% NBLL because of the changes in the bed structure by the physical interaction and the changes in the melt composition caused by the chemical interaction. The mixed burden performed better or at least no worse than a sinter only burden with the same total basicity. The BF modelling indicates that mixing lump with the sinter burden forms a narrower CZ with higher permeability and lower position in the blast furnace.
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Received: 18 March 2019
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2019, Vol. 54 
