| 摘要 |
<p>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 flotation promoter or frothing aid an invertible water in oil emulsion of sodium polyacrylate in a dosage calculated as 0.017 - 0.5 lb. of dry sodium polyacrylate per ton of dry coal. The preferred treating agent for oxidized coal undergoing froth flotation is an invertible water-in-oil emulsion of sodium polyacrylate. 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 sorbitan monooleate, a solvent such as Espesol 3-E* (Charter; an aromatic blend) and stabilizers such as polyisobutylene and aluminum tristearate.</p> |
