Process for recovering molybdenum values from spent catalysts
US4075278A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1977 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Feb 3, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G39/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process of recovering molybdenum from waste products and particularly from spent catalyst based on active alumina and containing molybdenum compounds comprising mixing the spent catalyst with sodium carbonate powder, adding water and remixing to absorb the water in the catalyst particles, baking the mixture to convert the molybdenum present to sodium molybdate, treating the mixture at ambient temperature with carbon dioxide gas, treating the resultant mixture with hot water to dissolve the sodium molybdate, neutralizing and clarifying with concentrated nitric acid, and precipitating to produce molybdic acid high in purity that is suitable for the production of molybdenum compounds as well as for the recovery of the pure metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.