Removal of vanadium from phosphoric acid
US5230876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | May 17, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G31/003
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus for removing vanadium from phosphoric acid includes a precipitator that receives vanadium-containing process-feed phosphoric acid and adds an oxidant to the process-feed phosphoric acid, whereupon precipitates containing phosphorus and vanadium are formed in a phosphoric acid filter feed slurry. The solid precipitate is removed by a filter. The filtrate, after optional further oxidation, is contacted to an ion exchange resin to remove additional vanadium from the filtrate to produce a phosphoric acid product of reduced vanadium content. A first portion of the phosphoric acid product is removed from the apparatus for further use. A reducing agent is added to a second portion of the phosphoric acid product, and the reduced acid is used to strip vanadium from the loaded ion exchange resin. The vanadium-loaded second portion of the phosphoric acid is mixed with fresh phosphoric acid and fed to the precipitator. The phosphoric acid in the precipitator has a phosphate content of from about 40-45 percent, and at least a portion of the phosphoric acid in the precipitator is produced by diluting more concentrated phosphoric acid to the 40-45 percent phosphate range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.