Comparison of the reducing activity of coke powder and semi-coke and its application in the carbonization process of Ti-bearing blast furnace slag

LU Ruifang; QIU Shuxing; ZHAO Qing’e; LÜ Xueming; HUANG Jiaxu; LIU Yadong

doi:10.7513/j.issn.1004-7638.2025.03.006

Volume 46 Issue 3

Jun. 2025

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2025 > 46(3): 32-40

LU Ruifang, QIU Shuxing, ZHAO Qing’e, LÜ Xueming, HUANG Jiaxu, LIU Yadong. Comparison of the reducing activity of coke powder and semi-coke and its application in the carbonization process of Ti-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 32-40. doi: 10.7513/j.issn.1004-7638.2025.03.006

Citation:

LU Ruifang, QIU Shuxing, ZHAO Qing’e, LÜ Xueming, HUANG Jiaxu, LIU Yadong. Comparison of the reducing activity of coke powder and semi-coke and its application in the carbonization process of Ti-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 32-40. doi: 10.7513/j.issn.1004-7638.2025.03.006

Citation:

LU Ruifang, QIU Shuxing, ZHAO Qing’e, LÜ Xueming, HUANG Jiaxu, LIU Yadong. Comparison of the reducing activity of coke powder and semi-coke and its application in the carbonization process of Ti-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 32-40. doi: 10.7513/j.issn.1004-7638.2025.03.006

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Comparison of the reducing activity of coke powder and semi-coke and its application in the carbonization process of Ti-bearing blast furnace slag

doi: 10.7513/j.issn.1004-7638.2025.03.006

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
2.
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Received Date: 2025-01-13
Publish Date: 2025-06-30

Abstract

Abstract

In the process of titanium extraction from Ti-bearing blast furnace slag by “high temperature carbonization and low temperature chlorination”, high temperature carbonization is very critical and important. The carbonaceous reducing agent used in the high temperature carbonization process directly affects the cost of the process and the carbonization rate of titanium dioxide in the blast furnace slag, so the selection of more high-quality and low-cost carbonaceous reducing agent is one of the important means to improve the quality and reduce the cost of high temperature carbonization process. In this study, semi-coke and coke powder with different particle size ranges were obtained by grinding and sieving as raw materials. By XRD, TGA, BET and other analytical methods, the difference of the reducing activity between semi-coke and coke powder was studied. The particle size of semi-coke corresponding to coke powder with the same reduction reaction activity was proposed, and the industrial application test was carried out. The results show that the graphitization degree of semi-coke is much lower than that of coke powder. In the range of conversion rate of 0.3~0.8, the average activation energy of semi-coke is lower than that of coke powder. When the particle size is more than 0.150 mm, the specific surface area of semi-coke is greater than that of coke powder, contributing to its higher reactivity than that of coke powder. Based on these, it is proposed that the particle size of semi-coke should be collaboratively controlled in the range of 1~2 mm and 0.150~1 mm. The industrial test results reveal that the power consumption per ton of slag and carbonization rate are the same as those of coke powder with particle size distribution currently used, when this above range-controlled semi-coke is applied to the high temperature carbonization process of Ti-bearing blast furnace slag.
- Ti-bearing blast furnace slag,
- semi-coke,
- coke powder,
- high temperature carbonization,
- reduction activation

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References

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