Processes for the smelting reduction of smeltable materials
US4756748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1987 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Apr 2, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/134
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the smelting reduction of oxide ores, in particular iron ores, employs a mixture of the finely divided ore with equally finely divided reductant, which in the case of iron ores preferably is a coal. The mixture is fed into the interior of a heated tubular reaction vessel and moved positively through a heated reaction zone by a screw conveyor embedded in the charge. The conveyor breaks away any accretions that stick to the wall before they can build to a size that will stall the conveyor. The particles are in the range 75-1400 micrometers with a preferred size of at least 95% less than 600 micrometers, and the preferred ratio of ore to reductant is in the range of ratios 18:82 to 30:70. The reduced iron can be fed directly into a melting furnace for separation of metal and non-metal, it can be powdered and separated magnetically or it can be briquetted. Multiple screw conveyors can be used to move multiple charges and the process can be used with nickel ores and in the production of metallurgical coke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.