Extraction Behavior of Vanadium and Chromium by Calcification Roasting-Acid Leaching from High Chromium Vanadium Slag: Optimization Using Response Surface Methodology

ABSTRACT

Calcification roasting-acid leaching were conducted to investigate the extraction behavior of vanadium and chromium from high-chromium vanadium slag (HCVS). The conditions were optimized by response surface methodology (RSM). Results showed that when HCVS and CaO were mixed in m(CaO)/m(V₂O₅) of 0.62, then roasted from room temperature to 840 °C and maintained for 170 min, a maximum vanadium leaching rate of 87.74% was achieved. Additionally, 0.68% chromium was co-leached, achieving the separation of vanadium and chromium. The roasting factors affecting vanadium extraction followed this order: roasting temperature>m(CaO)/m(V₂O₅)=holding time. For the chromium extraction, the interaction between m(CaO)/m(V₂O₅) and roasting temperature was significant.

KEYWORDS:

• High chromium vanadium slag
• calcification roasting
• acid leaching
• response surface method
• extraction

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the article.

Additional information

Funding

This research was financially supported by the Programs of the National Natural Science Foundation of China (No. 51574082), the Fundamental Funds for the Central Universities (Nos. 150202001 and 172507012) and the National Natural Science Foundation of China and Yunnan Provincial Government (No. U15022273).