Separation of polymetallic sulphides by froth flotation
US4880529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | May 11, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D2203/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A new depressant composition is provided for the enhanced separation into separate value metal concentrates of copper, nickel, zinc, lead present in polymetallic and massive sulphide ores. The depressant is added in an aqueous solution prepared by dissolving first a mixture of quebracho and dextrin, or quebracho and guar gum. To the solution of modified quebracho a water soluble salt of lignin sulphonate is added. The aqueous polymer of modified quebracho lighin sulphonate is further mixed with one or more of the following inorganic reagents: water soluble cyanide, metal sulphates and water soluble sulphites. The resulting depressant is added together with conventional flotation reagents in conventional mineral separation stages as required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.