关键词: 高灰细泥, 降灰, 分段加药, 部分精选

Abstract: 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 reclean 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 reclean 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%.