Roasting of mixed sulphide ores or concentrates
US4478794A · kind A · utility
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5Claims
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Key dates
| Filing date | Mar 3, 1983 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Mar 3, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B1/2406
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In the roasting (oxidation) of mixed zinc sulphide/lead sulphide concentrates, to give an oxidic product for reduction, improved sulphur elimination and reduced lead volatilization are achieved by mixing 2-20% by weight of zinc oxide with the mixed sulphide materials, forming pellets of 2-15 mm diameter and roasting these under controlled oxidation conditions, firstly at a lower temperature and then at a higher temperature; preferably at 850.degree.-950.degree. C. for the first stage and at 950.degree.-1050.degree. C. for the last stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.