Investigating kinetics in preparation of precipitated silica from iron ore tailings

Zhang Peng; Chen Xingyue; Ren Zhifeng; Li Yihong; Zhao Aichun; He Yibo

doi:10.7513/j.issn.1004-7638.2022.02.014

Volume 43 Issue 2

May 2022

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Zhang Peng, Chen Xingyue, Ren Zhifeng, Li Yihong, Zhao Aichun, He Yibo. Investigating kinetics in preparation of precipitated silica from iron ore tailings[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 87-93. doi: 10.7513/j.issn.1004-7638.2022.02.014

Citation:

Zhang Peng, Chen Xingyue, Ren Zhifeng, Li Yihong, Zhao Aichun, He Yibo. Investigating kinetics in preparation of precipitated silica from iron ore tailings[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 87-93. doi: 10.7513/j.issn.1004-7638.2022.02.014

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Investigating kinetics in preparation of precipitated silica from iron ore tailings

doi: 10.7513/j.issn.1004-7638.2022.02.014

College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China

Received Date: 2021-09-26
Available Online: 2022-05-11
Publish Date: 2022-04-28

Abstract

Abstract

Iron ore tailings (IOT), which are by-product of the ore-smelting process. It will be an inevitable trend to recycle them as a secondary resource due to the potential value of more than 100 billion yuan. Through the composition analysis of IOT from a steel plant in Hebei Province, the SiO₂ in IOT reaches 68.64%, existing mainly in the form of quartz, albite, talc and other crystals. Therefore, the calcination–acid leaching method was proposed to produce silica. The optimum calcination parameters were determined as follows: calcination temperature = 850 ℃, calcination time = 2 h, Na₂CO₃/SiO₂ = 1:1.5. For the acid leaching process, the pH value of the solution is 7 and the stirring temperature is 60 ℃. The results show that the extraction rate of Si from IOT reached 86.43 %, and the content of SiO₂ was 92.26%. In addition, the kinetics of the calcination process was studied, and the activation reaction mechanism and kinetic parameters of IOT were deduced, which provided a theoretical basis for the activation calcination process of IOT.
- iron ore tailings,
- resource utilization,
- precipitated silica,
- calcining and acid leaching,
- kinetics

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References(8)

References

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