| 摘要 |
<p>The invention is directed to a process for preparing vanadium pentoxide from an ash composition comprising solid ash particles, vanadium, iron and nickel compounds optionally present in an aqueous solution. The process comprises the following steps:
(i) leaching the ash composition by contacting the ash composition with an acid aqueous solution at a pH of below 1,
(ii) adding a reducing agent to the aqueous solution,
(iii) contacting the aqueous solution obtained in step
(ii) with an ion exchange resin in its H + ionic form,
(iv) desorption of the vanadium compounds from the ion exchange resin rich in vanadium compounds by contacting the ion exchange resin with an aqueous solution of H 2 SO 4 to obtain an aqueous solution rich in vanadium compounds, and
(v) converting and isolating the vanadium compounds as present in the aqueous solution to vanadium pentoxide.</p> |
