高灰氧化煤的浮选试验研究

针对高灰氧化煤存在的细粒级含量大、灰分高、难浮选等问题,研究了浮选机、浮选柱对高灰氧化煤浮选效果的影响,考察了脂肪醇(乙醇和丁醇)对氧化煤的去氧化作用。浮选机试验表明:经促进剂处理后,煤样浮选效果明显改善,与空白试验相比,丁醇处理后煤样的可燃体回收率提高了12.99%,精煤灰分降低了16.63%;丁醇改善氧化煤浮选效果的能力要强于乙醇,可燃体回收率提高了1.30%～11.43%,精煤灰分降低了0.21%～1.46%。浮选柱试验表明:丁醇对高灰氧化煤的浮选柱分选效果较乙醇好,在循环泵压力为0.16 MPa时,煤泥浮选效果最好,可燃体回收率为38.55%,精煤灰分为19.49%,比相同药剂条件下浮选机试验的可燃体回收率提高了6.26%,精煤灰分降低了3.32%。因此,经脂肪醇预处理后,煤泥浮选效果明显提高,且浮选柱的分选效果要好于浮选机。

Research on flotation test of ash oxidized coal

Ash oxidized coal has some disadvantages such as high content of fine fraction and ash,and it’s also difficult to separate.In order to resolve these problems,investigate the influence of flotation machine and columned pneumatic flotation machine on its flotation effect,also research the reducing action of fatty alcohol(ethanol and butanol) on ash oxidized coal.Flotation machine tests show that disposed by accelerator,coal sample flotation effect has been pronouncedly improved.Compared with blank test,combustible recovery has improved by 12.99 percent,clean coal ash has reduced by 16.63 percent while disposed by butanol.That means butanol has stronger reducing action than ethanol.Combustible recovery reduced added value ranges from 1.30 percent to 11.43 percent,while ash reduced value ranges from 0.21 percent to 1.46 percent.Columned pneumatic flotation machine tests show that butanol has better flotation effect than ethanol.While the pressure of circulating pump is 0.16 MPa,the flotation effect gets best.Combustible recovery is 38.55 percent,clean coal ash is 19.49 percent.Keeping flotation reagents unchanged,compared with flotation machine test,combustible recovery of columned pneumatic flotation machine has increased by 6.26 percent,clean coal ash has decreased by 3.32 percent.So fatty altohol helps to improve flotation effect,and effect of columned pneumatic flotation machine is better than that of flotation machine.