- Title
- Interaction between sinter and lump during softening and melting process
- Creator
- Liu, Xinliang; Honeyands, Tom; O'Dea, Damien; Mitra, Subhasish; Chen, Jeff; Qiu, Quangjun
- Relation
- Kang T'ieh/Iron and Steel Vol. 54, Issue 12, p. 19-26
- Publisher Link
- http://dx.doi.org/10.13228/j.boyuan.issn0449-749x.20190094
- Publisher
- Yejin Gongye Chubanshe
- Resource Type
- journal article
- Date
- 2019
- Description
- As the only ferrous burden material that can be directly charged into the blast furnace (BF), lump can be more environmentally friendly and economically effective than sinter or pellets. Despite this, lump utilisation in China is lower than that in other countries such as Japan. One of the main concerns is the perception that the softening and melting (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. In this work, both the chemical and physical interaction between basic sinter and Newman Blend Lump (NBLL) from Australia were studied using the softening and melting under load test and 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 1450℃ 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 Ca and Mg diffused from sinter to neighbouring lump ore particles during the S&M process in the temperature range from 1200℃ to 1300℃. Significant improvements were found in the S&M behaviour of a mixed burden with ~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. BF modelling indicates that mixing lump with the sinter burden forms a narrower CZ with higher permeability and lower position in the blast furnace (BF).
- Subject
- basic sinter; lump ore; softening and melting; voidage; interaction; neutron CT scanning
- Identifier
- http://hdl.handle.net/1959.13/1462960
- Identifier
- uon:46601
- Identifier
- ISSN:0449-749X
- Language
- chi
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