复合捕收剂M5419对金佳煤泥浮选的试验研究

Experimental study on flotation of fine coal using compound collector M5419 at Jinjia Mine Coal Preparation Plant

通过测量高效的复合捕收剂M5419、煤油和柴油与煤样作用后的接触角、Zeta电位、红外光谱,对比了三种捕收剂对煤泥的捕收能力,并采用三种捕收剂进行了煤泥的开路浮选试验。开路试验结果表明:M5419捕收剂用于盘江金佳煤泥浮选,精煤产率比柴油和煤油分别提高6.54个百分点、6.79个百分点;可燃体回收率分别提高7.83个百分点、5.66个百分点;煤样接触角比柴油和煤油分别提高3.5°和2.4°;等电点之差分别提高3.24 mV和1.91 mV。采用M5419作为捕收剂进行"一粗—二扫—四精"闭路浮选试验,精煤灰分可降至5.64%,可燃体回收率为88.70%,固定碳回收率达到99.03%,实现了煤泥的高效分离。

Through measuring the contact angle, Zeta potential and infrared spectrogram of the coal sample in the case of using respectively the high-efficiency M5419, diesel and kerosene as collecting reagent, the abilities of the above cited 3 kinds of collectors for catching coal particles are compared. As evidenced by result of open-circuit test made with the low-sulphur high-ash fine coal of Jinjia Coal Mine, Guizhou Province, using the 3 kinds of collecting agents, compared to the use of the latter 2 collectors, the use of M5419 can lead to a rise of concentrate yield by 6.54% and 6.79% respectively, an increase of combustible matter recovery rate by 7.83% and 5.66% , an increase of contact angle of coal sample by 3.5° and 2.4°, and an increase of difference in isoelectric point by 3.24 and 1.91. Closed-circuit test run encompassing ＂one-stage roughing, 3-stage scavenging and 4-stage cleaner operations＂ is also made with M5419 as collecting agent. Test result shows that with the use of M5419, the coal slime can be effectively separated as evidenced by the drop of concentrate ash down to 5.64% , a rise of the recovery rate of combustible matter up to 88.70% and a recovery rate of fixed carbon reaching as high as 99.03%.