Method of treating the slag from a copper converter
US4707185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Jan 29, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B15/0054
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of treating the slag from a copper converter comprises introducing the molten slag from a copper converter into a furnace having tuyeres through which air can be blown into the molten slag, blowing into the slag through the tuyeres at least 6% by weight of pulverized coal with air or oxygen-enriched air having an oxygen content of 21 to 40% by volume to separate molten metallic copper from the slag, the amount of the air having a ratio of 0.3 to 0.7 to theoretical combustion of the coal, adding a source of sulfur to the separated copper to form a molten matte, maintaining the matte at a reduced pressure not exceeding 0.6 mm Hg for at least five minutes in a vacuum refining apparatus to remove impurities from the matte by volatilization, and treating the refined matte in a copper converter used for the treatment of a matte produced by a smelting furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.