提高煤泥浮选捕收剂性能的试验研究

Experimental research on improvement of coal flotation collectors

针对煤泥浮选捕收剂分散难、选择性差、用量大等问题,利用不同化工产品及表面活性剂,将煤油制备成复合捕收剂用于煤泥浮选。分别进行了煤油、复合捕收剂的优选试验及浮选速度试验。优选试验表明:当煤油用量为900 g/t,仲辛醇用量为450 g/t时,煤油浮选效果最佳;当Fy-4复合捕收剂用量为500 g/t,仲辛醇用量为450 g/t时,精煤灰分为9.96%,精煤产率为88.72%,可燃体回收率为94.82%,在精煤灰分相近的条件下,Fy-4复合捕收剂的用量比煤油降低了44.44%,精煤产率和可燃体回收率分别提高了0.06%和0.16%。浮选速度试验表明:Fy-4复合捕收剂不仅节省了药剂用量,而且提高了煤泥浮选活性,提升了精煤浮选速度。最后探讨了无机电解质NaCl对复合捕收剂浮选效果的影响,当NaCl浓度为0.05 mol/L时,煤泥颗粒Zeta电位更趋近零电点,降低了煤泥颗粒的相对接触角,改善了煤泥浮选效果。

Large consumption,poor selectivity and failing to disperse are presently the main disadvantages of slime flotation collector.In order to resolve these problems,taking kerosene as raw material,a variety of chemical products and surfactant were used to prepare compound collectors.Conduct optimization experiments and flotation rate test experiments of kerosene and compound collector.The results of optimization experiments show that while the consumption of kerosene is 900 g/t and Octanol-2 is 450 g/t,the effect of kerosene flotation is best.While the consumption of Fy-4 compound collector is 500 g/t and Octanol-2 is 450 g/t,the effect of Fy-4 compound collector flotation is best,clean coal ash is 9.96 percent,clean coal recovery is 88.72 percent,and combustible recovery is 94.82 percent.Keeping ash nearly unchanged,the consumption of Fy-4 compound collector is 44.44 percent lower than kerosene,clean coal recovery and combustible recovery are increased by 0.06 percent and 0.16 percent respectively.Flotation speed tests prove that Fy-4 compound collector not only save the consumption of reagent,but also improves the activity of reagent,so to enhance the coal floating speed.At last,the impact on Fy-4 compound collector flotation of NaCl inorganic electrolyte was studied.While the NaCl concentration is 0.05 mol/L,Zeta potential of coal slime is much closer to zero point,relative contact angle of coal slime is reduced,coal flotation effect is improved.