Method for conducting wet grinding of phosphate rock in a phosphoric acid production plant
US4485077A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Aug 12, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/225
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and system for conducting wet grinding of mined phosphate rock before utilizing the same for the production of phosphoric acid by the wet process method, the method comprising the steps of: (1) wet grinding the phosphate rock in a medium of fresh water at a first stage so as to form a fresh water slurry comprising ground rock and fresh water, (2) sending the fresh water slurry from the first stage to a second stage, (3) dewatering the fresh water slurry at the second stage so as to recover most of the fresh water from the slurry and leave substantially only wet ground rock, (4) recycling the fresh water recovered at the second stage back to the first stage for use in further wet grinding, (5) sending the ground rock from the second stage to a third stage, (6) refluidizing the ground rock at the third stage with acidic pond water so as to form a pond water slurry comprising ground rock and pond water, and (7) thereafter passing the pond water slurry on to a reactor for standard processing so as to produce phosphoric acid by the wet process method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.