Pretreatment of chromium-bearing metal scrap to remove chromium
US5382278A · kind A · utility
2Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Aug 26, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for protreating chromium-beating metal scrap comprises charging the chromium-bearing metal scrap with an iron oxide-bearing slag into a pyrometallurgical furnace, heating and melting the charge, and maintaining the charge molten at a temperature of at least 1550.degree. C. for a predetermined time period to allow an iron oxide/chromium exchange reaction to take place oxidizing and removing chromium to the sing phase while reducing iron to the metal phase to form an alloy product containing Fe along with the Ni and/or Co, and removing the alloy product for further processing for recovery of metal values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.