Study on separation of titanium and slag during carbonization of titanium-bearing blast furnace slag

Jian Tingfang; Zhao Lang; Luo Xiangyu; Hu Meilong

doi:10.7513/j.issn.1004-7638.2021.06.006

Volume 42 Issue 6

Dec. 2021

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Jian Tingfang, Zhao Lang, Luo Xiangyu, Hu Meilong. Study on separation of titanium and slag during carbonization of titanium-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(6): 51-58. doi: 10.7513/j.issn.1004-7638.2021.06.006

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Jian Tingfang, Zhao Lang, Luo Xiangyu, Hu Meilong. Study on separation of titanium and slag during carbonization of titanium-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(6): 51-58. doi: 10.7513/j.issn.1004-7638.2021.06.006

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Study on separation of titanium and slag during carbonization of titanium-bearing blast furnace slag

doi: 10.7513/j.issn.1004-7638.2021.06.006

Jian Tingfang^{1, 2},
Zhao Lang^{1, 2},
Luo Xiangyu^{1, 2},
Hu Meilong^{1, 2
,}

1.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2.
Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing 400044, China

Received Date: 2021-09-13
Publish Date: 2021-12-31

Abstract

Abstract

The technology of high-temperature carbonization and low-temperature chlorination has been successfully developed by Pangang Group Company Limited to recover titanium from a large number of Ti-containing blast furnace slag produced during the application of the BF ironmaking technology to V-bearing titanomagnetite. However, It is also necessary to explore green and economic treatment methods because there are some challenges for this technology, such as grinding of carbide slag and utilization of chlorinated tailings. In view of the dispersion distribution of Ti(C,N) particles in high-temperature carbonization process, the idea of enrichment of Ti(C,N) by adding iron in carbonization process is proposed in this paper, and the effects of factors such as the mass ratio of iron to slag, the batches of adding iron, the holding time for enriching Ti(C,N) and the pre-adding content of iron on the enrichment process were investigated by experiment. The result shows that Ti(C,N) particles in the molten slag can aggregate on the surface of the molten iron which later sinks to the bottom of the crucible, and the lump iron coated by Ti(C,N) can be naturally separated from the residue by water quenching. With a specific iron-slag mass ratio of 1.50, iron added in two steps, i.e. 15%Fe is prepared in the slag and the rest of iron is added in batches within 30 min after holding at 1 600 ℃ for 30 min, shows good enriching effect. The Ti-content in the slag under this enrichment condition can be reduced from 13.79% to 4.59%, the enrichment rate of Ti(C,N) in carbonized slag can reach to 66.72%.
- high-titanium blast furnace slag,
- carbonization,
- iron,
- Ti(C,N),
- enrichment

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References(24)

References

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