Reagent for froth flotation of bituminous coal
US4372864A · kind A · utility
Inventor
Key dates
| Filing date | Dec 15, 1977 |
| Grant date | Feb 8, 1983 |
| Priority date | — |
| Expiry date | Dec 15, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D2203/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A reagent and a method for using the reagent for treating a solid material disposed in a liquid medium and having an oxygen-controlled surface condition. The reagent includes a liquid hydrocarbon, a reducing material and an activator material. The liquid hydrocarbon such as mineral oil has a specific gravity different from the specific gravity of the liquid medium. The reducing material such as phosphorous pentasulfide is present in an amount sufficient to establish a reducing environment around the solid material for breaking the oxygen control on the surface of the solid material. The activator material such as zinc thiophosphate is present in an amount sufficient to establish an electrostatic charge on the solid material after the oxygen-controlled surface condition has been broken. A more specific feature of the invention is directed to the method of flotation of extremely fine bituminous coal having an oxygen-controlled surface condition. The reagent is used in the conventional froth flotation equipment of the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.