Crystal modification in wet process phosphoric acid production
US5009873A · kind A · utility
9Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/226
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A wet process production of phosphoric acid in which phosphate rock is digested, whereby phosphoric acid is released and calcium sulfate crystals are formed, employs a polymeric crystal modifier in the digestion stage of the process to improve the separation of the raw phosphoric acid product from the calcium sulfate crystals and to increase the concentration of phosphoric acid in the raw phosphoric acid product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.