The flotation studies of non-coking coal fines containing 37.7% ash were carried out.The variables studied were pH,collector,frother,modifier (sodium silicate) and coal size.Experiments were carried out using 2~5 full factorial design.The main and interaction effects on recovery and grade were evaluated using Yates' analysis.The optimum flotation condition was found by the method of steepest ascent.A product with 72.62% combustibles (i.e.25.38% ash) at 88.03% recovery was obtained at pH 7.5,diesel oil 0.42 g/kg,MIBC 0.09 g/kg,sodium silicate 0.02 g/kg and coal size -0.6 mm at optimum conditions.
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机译：进行了灰分含量为37.7％的非焦煤粉的浮选研究。所研究的变量为pH，收集器，起泡剂，改性剂（硅酸钠）和煤的大小。使用2〜5个全因子设计进行了试验。并利用耶茨分析法评价了其对回收率和品位的影响。通过最陡上升法确定了最佳浮选条件。在pH 7.5时，柴油可回收率为88.03％的可燃物为72.62％（灰分为25.38％）。油在最佳条件下为0.42 g / kg，MIBC为0.09 g / kg，硅酸钠为0.02 g / kg，煤尺寸为-0.6 mm。
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