Beneficiation process for oxidized iron ore
US4246025A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1978 |
| Grant date | Jan 20, 1981 |
| Priority date | — |
| Expiry date | Oct 30, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21B15/006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A chlorine source is provided in a reactor in combination with a ground oxidized ore and a particulate carbonaceous reductant. The amount of chlorine provided is significantly less than the stoichiometric requirements for reaction with the total iron content of the ore; the amount of the reductant is greater than that required to effect the reduction of the total iron content of the ore. The reactor is operative to retain the reaction gases in intimate contact with the feedstock mixture without significant dilution of said gases in order to provide a reducing atmosphere. The mixture is indirectly heated to a temperature below 950.degree. C., preferably in the range 700.degree.-950.degree. C., and the mixture is retained in the reactor for a period of time sufficient to cause the major portion of the iron to be transported out of the ore and to be deposited on or near the solid reductant and form discrete metal particles. These particles can be separated from the gangue minerals, for example by magnetic separation, to provide a high yield-high quality iron concentrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.