A clean metallurgical process for vanadium precipitation from vanadium-rich solutions

Abstract

Ammonium salt vanadium precipitation process has excellent performance in industrial production, but its shortcomings such as high cost and environmental impact are not conducive to sustainable development. In this paper, ethylenediamine was selected as the precipitant, and vanadate was precipitated from acidic simulated vanadium-rich solutions by the ammonium salt precipitation process. The high purity V₂O₅ product was obtained after calcination. Under optimal conditions, the precipitation rate of vanadium reached 94.8 %, and the purity of vanadium was as high as 99.1 %. The vanadium precipitation product was hexamethyl ammonium, and the vanadium product was V₂O₅. It can be derived by the differential method that the reaction order was n = 2.4, the reaction rate equation was $C_V^{-1.4}=kt+a$, and the apparent activation energy was 27.8097 kJ/mol, which can be classified as the diffusion-controlled reaction. This innovative process enables a savings of 5050 yuan per ton of V₂O₅. On this basis, a complete V₂O₅ production process with zero waste discharge was designed.