Details

Autor(en) / Beteiligte

• Peng, Hao
• Guo, Jing
• Huang, Huisheng
• Li, Bing
• Zhang, Xingran

Titel

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

Ist Teil von

• ACS omega, 2021-10, Vol.6 (41), p.27478-27484

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.