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Leaching kinetics of acid-soluble Cr(VI) from chromite ore processing residue with hydrofluoric acid

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Abstract

Leaching kinetics of acid-soluble Cr(VI) in chromite ore processing residue (COPR) using hydrofluoric (HF) acid solution as a leaching agent was investigated for potential remediation of COPR with industrial waste water containing HF. The results show that HF can effectively destabilize the Cr(VI)-bearing minerals, resulting in the mobilization of Cr(VI) from COPR into the leachate. Particle size significantly influences the leaching of acid-soluble Cr(VI) from COPR, followed by leaching time, whereas the effects of HF concentration and leaching temperature are slight and the influence of stirring rate is negligible. The leaching process of acid-soluble Cr(VI) from COPR is controlled by the diffusion through the product layer. The apparent activation energy is 8.696 kJ/mol and the reaction orders with respect to HF concentration and particle size is 0.493 8 and −2.013 3, respectively.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Xiao-bin) Li  (李小斌), Wen-bin Xu  (徐文彬), Qiu-sheng Zhou  (周秋生), Zhi-hong Peng  (彭志宏) & Gui-hua Liu  (刘桂华)

  2. Shandong Branch, Aluminum Corporation of China Limited, Zibo, 255052, China

    Wen-bin Xu  (徐文彬)

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  1. Xiao-bin) Li  (李小斌)
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  2. Wen-bin Xu  (徐文彬)
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  3. Qiu-sheng Zhou  (周秋生)
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  4. Zhi-hong Peng  (彭志宏)
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  5. Gui-hua Liu  (刘桂华)
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Correspondence to Qiu-sheng Zhou  (周秋生).

Additional information

Foundation item: Project(2009FJ1009) supported by Major Program of Hunan Provincial Science and Technology, China; Project(2005CB6237) supported by the National Basic Research Program of China

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Li, Xb., Xu, Wb., Zhou, Qs. et al. Leaching kinetics of acid-soluble Cr(VI) from chromite ore processing residue with hydrofluoric acid. J. Cent. South Univ. Technol. 18, 399–405 (2011). https://doi.org/10.1007/s11771-011-0710-x

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  • DOI: https://doi.org/10.1007/s11771-011-0710-x

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