部分精煤再浮工艺对难浮煤泥的浮选效果改善研究

Improvement of partial-concentrate recleaning process in hard-to-float fine coal flotation

对于高灰细粒难浮煤泥,采用一次浮选工艺往往会由于高灰细泥的污染导致精煤的产率和灰分难以兼顾。分步释放试验的结果表明,精选工艺能够有效地提高难浮煤泥的精煤产率。根据浮选速度试验的结果,随着浮选的进行,泡沫产品的灰分逐渐升高,各产品中高灰颗粒的含量也逐渐升高。以上试验结果为部分精煤再浮工艺的可行性提供了理论支撑。最后,对部分精煤再浮工艺的浮选效果展开了试验研究,并创新性地使用二次加药制度对其强化,得到了精煤灰分10.86%,精煤产率61.30%的浮选效果,相比一次浮选工艺,其浮选完善指标提高了9.48%。

It is difficult to achieve both satisfactory concentrate yield and ash content simultaneously for hard-to-float fine coal by only rough flotation process.The results of flotation rate tests showed that concentrate recleaning process increased concentrate yield of hard-to-float fine coal effectively.Flotation rate test was also conducted,results of which showed that ash content of froth increased with the flotation time,as well as the proportion of high-ash particles in the corresponding froth product.Results above demonstrate the theoretical foundation of partial-concentrate reclean process.For further demonstration,flotation experiments for the partial-concentrate recleaning process were conducted,with process intensification by two stage reagent addition,and concentrate yield of 61.30%with ash 10.86%was achieved.Compared with rough flotation process,flotation efficiency was increased by 9.48%.