Recovery of vanadium with melamine in acidic medium

ABSTRACT

Many hydro-metallurgical methods are developed to recover vanadium, while ammonium salt precipitation possesses the final step and it has threatened the environment. The key point is to find a new compound to replace ammonium salts without reducing vanadium recovery efficiency. Some compounds with –NH₂ function groups have attracted our attention as they have similar function groups with ammonium salts. In this paper, the adsorption of vanadium with melamine is conducted. The results show that high adsorption efficiency can be achieved in a short time and melamine displays great performance in the recovery of all concentrations of vanadium. Response surface methodology (RSM) is used to optimize the reaction conditions and order the parameters: reaction temperature > concentration of vanadium > dosage of melamine > reaction time. 99.63% vanadium is adsorbed under optimized conditions: n(melamine)/n(V) = 0.6, reaction time of 60 min, 10 g/L vanadium solution and reaction temperature of 60°C. The successful application of melamine in the recovery of vanadium provides a new way for the utilization of melamine and also a glorious future for –NH₂ compounds in the recovery heavy metals.

GRAPHICAL ABSTRACT

KEYWORDS:

• Response surface methodology
• adsorption of vanadium
• melamine
• high recovery efficiency of vanadium

Acknowledgements

This work was supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (No. KJQN202201406) and Chongqing Science and Technology Commission (No. cstc2021jcyj-msxmX0129).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Chongqing Municipal Education Commission Foundation: [Grant Number KJQN202201406]; Science and Technology Research Program of Chongqing Municipal Education Commission: [Grant Number cstc2021jcyj-msxmX0129].