Recovery of phosphorus from dilute waste streams
US4595492A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Nov 19, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/907
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for recovery of elemental phosphorus from phosphorus sludge produced in a phosphorus furnace by treating the sludge in a centrifugal separator and separating a fine dirt slimes fraction from a recovered heavy fraction containing the major portion of phosphorus; treating the slimes fraction in hydrocyclones not over one inch (24.4 mm) in diameter to separate two streams, a first phosphorus-poor stream containing particles smaller than 8-15 micrometers, and a second phosphorus-rich stream containing particles larger than 8-15 micrometers; recycling the second, phosphorus-rich stream to the centrifugal separator for phosphorus recovery, and discarding the first, phosphorus-poor stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.