| 摘要 |
<p>PROMOTERS FOR FROTH FLOTATION OF COAL Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an effective proportion of a promoter which is an aromatic or at least C10 aliphatic carboxylic acid or an aliphatic ester thereof which is devoid of nitrogen atoms; a nitrile promoter; the epoxidized, hydroxylated, oxidized, or alkoxylated derivative of said acid, ester, and nitrile promoters; a higher fatty alcohol promoter and its alkoxylated derivatives; and mixtures thereof.</p> |
