| 摘要 |
<p>A method of increasing the yield of oxidized coal or coal from surface or strip mines by about 23-30% by weight where said coal particles are concentrated by froth flotation. The method consists of utilizing as a promoter or frothing aid about 0.03 - 0.09 lbs/ton of said coal of a watersoluble anionic linear addition polymer of a polymerizable monoethylenically unsaturated compound having an average molecular weight of about 100,000 to 1,000,000 or more with a preferred range of 1,000,000 or more. This method is also utilized where oxidized coal is admixed with a major amount of deep coal amounting up to 80 - 95% and greater by weight of the mixture. A preferred promoter or frothing aid for oxidized coal is sodium polyacrylate and the promoter or frothing aid is used in an aqueous solution or dispersion in preferred operable percentiles of .5 - 1.5% by weight of the solution or dispersion.</p> |
