Lime enhanced pressure filtration of iron and steel making sludge
US6007601A · kind A · utility
1Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Aug 21, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/962
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method is provided for improving the filtration rate of nonhazardous wastewater streams generated at a steel plant. The solids are concentrated in the wastewater stream. No more than about 5% by weight of lime is added to the concentrated wastewater stream which is then dewatered. A friable filter cake is produced by allowing the solids to harden. The lime addition results in a significant increase in the rate at which the stream may be filtered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.