Flotation of oxidized coal with a latex emulsion of sodium polyacrylate used as a promoter
US4222862A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Oct 6, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03D2203/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and treating agent for increasing the yield of oxidized coal or coal from surface or strip mines where said coal particles are concentrated by froth flotation. The method consists of utilizing as a promoter or frothing aid about 0.05-1.5 lbs of sodium polyacrylate latex per ton of dry coal (0.017-0.5 lb of dry sodium polyacrylate per ton of dry coal), having an average molecular weight of about 100,000 to 1,000,000 and more, with a preferred range of 1,000,000 or more. The preferred promoter or frothing aid for oxidized coal is a water-in-oil latex of sodium polyacrylate and preferably used with an alcohol-type frother. The latex may be utilized neat and self inverts with the assistance of an oil-in-water surfactant hydrophilic (or activator) and the water in the system upon application to form an oil-in-water emulsion, or it may be used as a two-part system with an activator (aqueous) to promote inversion. The latex emulsion has demonstrated superiority as a flotation promoter for oxidized coal over the dry polymer and exhibits synergism over the dry polymer and over the components of the latex emulsion including a paraffin solvent, a hydrophobic emulsifier such as sorbit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.