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Ni C.,China University of Mining and Technology | Xie G.-Y.,China University of Mining and Technology | Xie G.-Y.,Key Laboratory of Coal Processing and Efficient Utilization Ministry of Education | Jiang Z.-G.,China Railway Resources Group Co. | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

High clean coal ash problem in "2+2" coal slime separation process, usually seen in high ash coarse slime and high ash fine slime beneficiation, may contributes to clean coal loss, because heavy medium cyclone clean coal should be controlled at relatively low level to meet the total ash requirement. In order to tackle the problem, Teetered Bed Separator and cyclonic micro-bubble flotation column were introduced to the "2+2" process to separate coarse and fine coal slime respectively. The results demonstrate that, Teetered Bed Separator can recycle qualified clean coal at high quantity efficiency and low Ep value (85.01% and 0.069 respectively). Cyclonic micro-bubble flotation column, used as the second stage flotation column, is able to treat high ash fine slime at better performance than conventional flotation cell. At the kerosene dosage level of 1000 g/t and the octanol dosage level of 125 g/t, column flotation is 3.76% lower in clean coal ash, 4.10% and 9.97% higher in clean coal yield and flotation perfection index respectively than conventional cell flotation. Source


Peng Y.-L.,China University of Mining and Technology | Peng Y.-L.,Key Laboratory of Coal Processing and Efficient Utilization Ministry of Education | Xie G.-Y.,China University of Mining and Technology | Xie G.-Y.,Key Laboratory of Coal Processing and Efficient Utilization Ministry of Education | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2013

Adverse effect on separation operation of flotation column as the concentration of coal slurry increase in current dense medium coal cleaning process was analyzed in this study. A new thought to separate high concentration coal slurry by primary and secondary column flotation process was put forward, and its feasibility was verified by experiments. The whole flotation effect was warranted through maintaining quality by primary column flotation and maintaining quantity by secondary column flotation, which can be used to overcome the separation problems of high concentration coal slurry. In addition, the processing parameters, which influence on the separating effects, were studied through orthogonal experiments. The order of influence degree on clean coal yield is primary flotation pressure > secondary flotation pressure > concentration, on flotation clean coal ash is primary flotation pressure > concentration > secondary flotation pressure, and on flotation perfection index is primary flotation pressure > secondary flotation pressure > concentration. Source

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