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Kinetics of iron removal from metallurgical grade silicon with pressure leaching

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Abstract

In this paper, the kinetics of pressure leaching for purification of metallurgical grade silicon with hydrochloric acid was investigated. The effects of particle size, temperature, total pressure, and concentration of hydrochloric acid on the kinetics and mechanism of iron removal were studied. It was found that the reaction kinetic model followed the shrinking core model, and the apparent activation energy of the leaching reaction was 46.908 kJ/mol. And the apparent reaction order of iron removal with pressure leaching was 0.899. The kinetic equation was obtained and the mathematical model of iron removal from metallurgical grade silicon (MG-Si) was given as follows:

$1 - \frac{2} {3}x - (1 - x)^{{\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}} = \exp (5.1654 - 4811.459\frac{1} {T} + 1.287\ln p + 1.046\ln [C]).\frac{t} {{r_0 ^2 }} $

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The values calculated from the equation were consistent with the experimental results.

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Authors and Affiliations

  1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China

    Zhanliang Yu, Keqiang Xie, Wenhui Ma, Yang Zhou & Yongnian Dai

  2. Technology Center of Yunnan Metallurgy Group Co., Kunming, 650031, China

    Zhanliang Yu & Gang Xie

  3. Kunming Metallurgy Research Institute, Kunming, 650031, China

    Zhanliang Yu & Gang Xie

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  1. Zhanliang Yu
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  2. Keqiang Xie
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  3. Wenhui Ma
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  4. Yang Zhou
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  5. Gang Xie
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  6. Yongnian Dai
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Correspondence to Keqiang Xie.

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Yu, Z., Xie, K., Ma, W. et al. Kinetics of iron removal from metallurgical grade silicon with pressure leaching. Rare Metals 30, 688–694 (2011). https://doi.org/10.1007/s12598-011-0450-y

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  • DOI: https://doi.org/10.1007/s12598-011-0450-y

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