Processes for the removal and recovery of minor elements in wet-process phosphoric acid
US9573810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2013 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | Jul 21, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/46
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In alternative embodiments, the invention provides processes and methods for the recovery or the removal of the so-called “Minor Elements” consisting of iron, aluminum and magnesium (expressed as oxides), from wet-process phosphoric acid using a continuous ion exchange approach. In alternative embodiments, use of processes and methods of the invention allows for the reduction of these Minor Elements with minimal phosphate losses and dilution in order to produce a phosphoric acid that is suitable for the production of fertilizer products such as world-class diammonium phosphate (DAP), merchant-grade phosphoric acid, superphosphoric acid, and other phosphoric acid products. Further, use of the invention would allow the use of lower grade phosphate rock or ore, which would greatly expand the potential phosphate rock reserve base for phosphate mining activities, and allow for better overall utilization of resources from a given developed mine site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.