Novel Technology for Vanadium and Chromium Extraction with KMnO4 in an Alkaline Medium

Hao Peng; Jing Guo; Huisheng Huang; Bing Li; Xingran Zhang

doi:10.1021/acsomega.1c04397

Novel Technology for Vanadium and Chromium Extraction with KMnO₄ in an Alkaline Medium

ACS Omega. 2021 Oct 7;6(41):27478-27484. doi: 10.1021/acsomega.1c04397. eCollection 2021 Oct 19.

Authors

Hao Peng¹, Jing Guo¹, Huisheng Huang¹, Bing Li¹, Xingran Zhang²

Affiliations

¹ Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, Chongqing 408100, P. R. China.
² College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, P. R. China.

Abstract

This paper focused on the oxidation-alkaline extraction process of vanadium-chromium-reducing residue. The affected parameters including reaction temperature, KMnO₄ dosage, reaction time, NaOH dosage, and liquid-to-solid ratio on the extraction process were investigated. The E-pH diagram and the thermodynamic analysis indicated that KMnO₄ was suitable for the oxidation of low-valence vanadium and chromium. Vanadium (97.24%) and chromium (56.20%) were extracted under the following optimal reaction conditions: reaction temperature of 90 °C, reaction time of 90 min, dosage of KMnO₄ at m(KMnO₄)/m(residue) = 0.40, dosage of NaOH at m(NaOH)/m(residue) = 0.30, and liquid-to-solid ratio at 5:1 mL/g. The extraction process of vanadium was controlled by the reactant through the solid product layer and the extraction kinetics behavior fitted well with the shrink core model with an E _a of 15.37 kJ/mol. At the same time, the surface chemical reaction was the controlling step for chromium extraction, which was difficult with an E _a of 39.78 kJ/mol.