Method for heat-treating recyclings containing oil and iron oxide
US6391088B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2001 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Mar 2, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/962
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for thermal treatment of residual materials containing oil and iron oxide in a multiple-hearth furnace, which has several hearths one above the other, the residual materials containing oil and iron oxide being mixed with a solid reducing agent, introduced continuously into the multiple-hearth furnace, charged on the top hearth and transferred gradually to the lower hearths, the residual materials containing oil and iron oxide being dried in the top hearths, the oil subsequently evaporated and pyrolised and the reducing agent reacting with the iron oxides to form directly reduced iron, the directly reduced iron being discharged with residues of reducing agents in the areas of the bottom hearth of the multiple-hearth furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.