Chemical conditioning of fine coal for improved flotation and pyrite rejection
US4828686A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Jun 5, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D2203/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for enhancing hydrophobicity of high volatile bituminous coal and coals of a lower grade and for separating ash and sulfur (including pyritic sulfur) contaminants from coal in a floatation process. The method comprises the steps of grinding the coal to small particulate size, forming a slurry of the ground coal and mixing the slurry with at least one compound selected from the group comprising inorganic peroxy compounds, 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.