Simultaneous preparation of calcium titanate from ilmenite by direct reduction and recovery of iron

Li Gang; Kou Jue; Sun Tichang; Li Xiaohui

doi:10.7513/j.issn.1004-7638.2021.04.005

Volume 42 Issue 4

Aug. 2021

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Li Gang, Kou Jue, Sun Tichang, Li Xiaohui. Simultaneous preparation of calcium titanate from ilmenite by direct reduction and recovery of iron[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 23-32. doi: 10.7513/j.issn.1004-7638.2021.04.005

Citation:

Li Gang, Kou Jue, Sun Tichang, Li Xiaohui. Simultaneous preparation of calcium titanate from ilmenite by direct reduction and recovery of iron[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 23-32. doi: 10.7513/j.issn.1004-7638.2021.04.005

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Simultaneous preparation of calcium titanate from ilmenite by direct reduction and recovery of iron

doi: 10.7513/j.issn.1004-7638.2021.04.005

Li Gang^1
,,
Kou Jue^{1
,
,},
Sun Tichang¹,
Li Xiaohui^{1, 2}

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Faculty of Culture and Tourism, Qujing Normal University, Qujing 655011, Yunnan, China

Received Date: 2021-07-29
Publish Date: 2021-08-10

Abstract

Abstract

The paper studied the phase transformation of titanium and the formation mechanism of calcium titanate during the simultaneous preparation of calcium titanate by direct reduction of iron from ilmenite coal-based embedding method, and clarified the influence of additives such as calcium carbonate dosage and roasting temperature on reduced iron and titanium. The influence law and mechanism of calcium acid. The results show that the raw ilmenite pellets containing 60% calcium carbonate are roasted at a constant temperature of 1400 ℃ for 180 min by the coal-based embedding method, which can produce direct reduced iron while simultaneously producing titanium in the form of pure calcium titanate. Under the action of the additive calcium carbonate, when the calcination temperature is >1300 ℃, calcium titanate begins to be produced as the main titanium-containing phase, and the best calcination temperature obtained by the experiment is 1400 ℃. As the amount of calcium carbonate increases, the content of black titanite in the calcined product gradually decreases, and the content of calcium titanate gradually increases. However, the large amount of calcium carbonate causes the reduced iron particles to become finer, which is not conducive to the subsequent grinding and magnetic separation. Under laboratory conditions, the TFe grade of the reduced iron product is 81.86% and the recovery rate is 91.27%. The grade of Ti in the calcium titanate product is 26.95%, the content of calcium titanate is 76.37% and the recovery rate of titanium is 90.15%.
- ilmenite,
- direct reduction,
- coal-based embedding method,
- roasting,
- calcium titanate,
- reduced iron

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References(26)

References

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