Method in connection with steel production
US8278496B2 · kind B2 · utility
0Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 7, 2007 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | Nov 24, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention relates to a method in connection with steel production for handling of hydroxide sludge formed in the neutralization of spent metal-contaminated pickling agents from a pickling step for steel, preferably stainless steel and for using calcium fluoride in the hydroxide sludge to replace the natural fluorspar as a fluxing agent in connection with steel production. Accordingly, the addition of the reactive neutralization medium is monitored by the pH electrodes operated in continuous fashion, and the pH value is adjusted at the range between 9.0 and 9.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.