| 摘要 |
A process for the preparation of pentavalent vanadium compounds from acid extracts obtained by regenerating spent catalysts which contain vanadium, this process comprising the successive steps of 1) oxidizing extracts containing tri- and tetravalent vanadium with an oxygen-containing gas at a pH of at least 0.7-1.4 P and at most 2.3-1.4 P to form a solution of tetravalent vanadium compounds, and 2) continuing the oxidation at a pH lying in the range of from 3.2-1.4 P to 2.3-1.4 P to form concentrates of pentavalent vanadium, in which P stands for the partial oxygen pressure, in MPa. |
