| 摘要 |
A process for recovering tungsten from a spent catalyst comprising a supported heteropolytungstic acid characterised in that the process comprises:
(a) contacting the spent catalyst with an extractant selected from water, methanol, ethanol or a mixture of any two or more thereof for sufficient time to extract at least part of the heteropolytungstic acid therefrom;
(b) separating the extractant containing heteropolytungstic acid from the treated spent catalyst;
(c) contacting the extractant containing heteropolytungstic acid with a strong acid ion exchange resin to remove corrosion metals contained therein and
(d) recovering the treated extractant containing heteropolytungstic acid for subsequent use. |
