Chemical conditioning of fine coal for improved flotation and pyrite rejection
US5008006A · kind A · utility
Inventors
Key dates
| Filing date | Feb 27, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Feb 27, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D2203/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for separating ash and sulfur (including pyritic sulfur) contaminants from coal in a flotation process. The method comprises the steps of grinding the coal to small particlate size, forming a slurry of the ground coal and mixing the slurry with at least one compound selected from the group consisting of peroxy compounds, peroxides and superoxides the preferred compound being oxone which is a mixture of potassium monopersulfate, potassium hydrogen sulfate and potassium sulfate. This slurry is allowed to react to condition the particulate coal and develop increased hydrophobicity for the coal while depressing the sulfur contaminants and ash during froth flotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.