| 摘要 |
<p>A method and treating agent for increasing the yield of deep mined coal where the particles in the coal are concentrated by froth flotation. This method consists of utilizing as a promoter an invertible water-in-oil emulsion of sodium polyacrylate (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. The promoter is preferably used with an alcohol-type frother. The emulsion may be utilized neat and self inverts with the assistance of an oil-in-water surfactant (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.</p> |
