Study on sodium roasting kinetics of vanadium removal slag of titanium tetrachloride

Du Weitong; Jiang Congxiang; Zheng Ruiqi; Chen Zhuo; Ju Dianchun

doi:10.7513/j.issn.1004-7638.2022.01.002

Volume 43 Issue 1

Mar. 2022

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Du Weitong, Jiang Congxiang, Zheng Ruiqi, Chen Zhuo, Ju Dianchun. Study on sodium roasting kinetics of vanadium removal slag of titanium tetrachloride[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 7-12. doi: 10.7513/j.issn.1004-7638.2022.01.002

Citation:

Du Weitong, Jiang Congxiang, Zheng Ruiqi, Chen Zhuo, Ju Dianchun. Study on sodium roasting kinetics of vanadium removal slag of titanium tetrachloride[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(1): 7-12. doi: 10.7513/j.issn.1004-7638.2022.01.002

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Study on sodium roasting kinetics of vanadium removal slag of titanium tetrachloride

doi: 10.7513/j.issn.1004-7638.2022.01.002

School of Metallurgy and Material Engineering, Jiangsu University of Science and Technology (Zhangjiagang), Zhangjiagang 215600, Jiangsu, China

Received Date: 2021-09-27
Available Online: 2022-04-24
Publish Date: 2022-02-28

Abstract

Abstract

Based on non-isothermal thermogravimetric analysis, the influences of Na₂CO₃ addition and heating rate on oxidation of vanadium removal slag of titanium tetrachloride (vanadium-containing tailings) were studied. The Kissinger-Akahira-Sunose (KAS) method was used to calculate the activation energy and pre-exponential factor of the oxidation process of vanadium-containing tailings. Through the Coats-Redfem method, the mechanism function was inferred and the kinetics equations of different stages were established. The results show that the temperature for complete oxidation of the vanadium-containing tailings is 700 ℃. With the increase of Na₂CO₃ addition, the apparent activation energy gradually decreases and the oxidation rate increases. While the Na₂CO₃ addition exceeds 20%, the glassy phase appears during the oxidation roasting process which results in sintering, and the apparent activation energy gradually increases with the oxidation rate decreased consequently. The sodium roasting process can be divided into four stages and the kinetics equations are as follows: the first stage of two-dimensional diffusion with dα/dT=exp(−72.03/RT)4(1−α)^1/2[1−(1−α)^1/2]²0.022/β, the second stage of three-dimensional diffusion with dα/dT = exp (−23.7/RT)3/2(1−α)^4/3[(1−α)^−1/3−1]⁻¹0.014/β, the third stage of chemical reaction with dα/dT=exp(−27.91/RT)(1−α)²0.06/β and the fourth stage of nucleation and growth with dα/dT=exp(−12.09/RT)2(1−α)[−ln(1−α)]^1/20.14/β.
- vanadium-containing tailings,
- sodium roasting,
- non-isothermal thermogravimetry,
- activation energy,
- kinetic equations

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References

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