Method of reducing the iron content of steel slag
US6277171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1998 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Jul 10, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of reducing the iron content of starting material containing calcium, silicon and oxygen, and iron in the form of a ferrite and/or oxide, for example a steel slag, includes the steps of heating the starting material to a temperature of at least 800.degree. C. and preferably between 900.degree. C. and 1150.degree. C. inclusive, in the presence of a reductant such as carbon monoxide and in the presence of a siliceous material with which non-ferrous oxides released during the reduction form high melting point compounds, to produce a magnetic form of iron, and removing at least some of the magnetic form of iron to produce a product, which may be used as a raw material in the cement industry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.