Recovery of elemental phosphorus from phosphorus sludge
US6451276B1 · kind B1 · utility
4Cited by
5References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1999 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Dec 6, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/906
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the melted sludge and about 0.5 to about 5 wt % of an oxidizing agent, based on the weight of elemental phosphorus in the sludge, and about 75 to about 580 wt % water, based on the weight of the sludge. The mixture is stirred until a continuous elemental phosphorus phase forms. The purified phosphorus phase is separated from the mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.