| 摘要 |
A method for recycling and preparing low-silicon high-purity vanadium pentoxide (V2O5) from a mixed solution containing vanadium, chromium and silicon. The method comprises the following steps: firstly, silicon is removed from a solution containing vanadium, chromium and silicon using an amphoteric metal salt and/or an alkali metal salt, then other introduced impurities are removed by adjusting the pH value, and solid-liquid separation is performed; the vast majority of the vanadium is selectively extracted into an organic phase using a primary amine extraction system, the vanadium in the vanadium-rich organic phase is stripped using an alkaline solution containing an ammonium salt, and ammonium metavanadate precipitates out, and a water phase, after stripping has been performed, is filtered or centrifuged to obtain a high-purity ammonium metavanadate solid, and after washing and drying, calcination is performed at a certain temperature to obtain a brick-red substance, V2O5, having a purity of more than 99.9% and a silicon content of less than 0.007%. No interlayer is formed in the extraction-stripping process. |
