超声波强化褐煤浮选及其作用机制探讨
发布时间：2019-07-12 12:44
【摘要】：为强化褐煤浮选,提出了在浮选矿浆中引入超声波的新型浮选方式,结果表明:超声浮选精煤产率比常规浮选精煤产率增加了20.31%,灰分降低了7.94%,其中-0.045 mm粒级产率增加了近2倍。采用筛分、扫描电镜、X射线光电子能谱、诱导时间测定仪等方法研究了超声波对煤泥粒度组成和表面性质的影响,并重点探讨了超声波强化褐煤浮选的回收机理。超声波对煤粒表面的清洗和破碎作用使颗粒表面细泥黏附减少,但并未改变煤粒表面疏水性与亲水性官能团含量。超声波可在浮选矿浆中产生大量微泡,既可吸附于褐煤表面增强其疏水性,又增加煤粒与气泡的碰撞/黏附效率。超声波产生的空化作用在一定程度上可使煤表面的水化膜变薄-不稳定-易破裂,进一步强化了褐煤的浮选回收。
[Abstract]:In order to strengthen lignite flotation, a new flotation method by introducing ultrasonic wave into flotation pulp was put forward. the results show that the yield of purified coal by ultrasonic flotation is 20.31% higher than that by conventional flotation, the ash content is reduced by 7.94%, and the grain yield of-0.045 mm is nearly tripled. The effects of ultrasonic wave on the particle size composition and surface properties of slime were studied by means of screening, scanning electron microscope, X-ray photoelectron spectroscopy and induction time tester, and the recovery mechanism of lignite flotation strengthened by ultrasonic wave was discussed in detail. The cleaning and crushing effect of ultrasonic wave on the surface of coal particles reduces the adhesion of fine mud on the surface of coal particles, but does not change the content of hydrophobic and hydrophilic functional groups on the surface of coal particles. Ultrasonic wave can produce a large number of microbubbles in flotation pulp, which can not only be adsorbed on the surface of lignite to enhance its hydrophobicity, but also increase the collision / adhesion efficiency between coal particles and bubbles. To a certain extent, the cavitation produced by ultrasonic wave can make the hydration film on the coal surface thin, unstable and easy to break, which further strengthens the flotation recovery of lignite.
【作者单位】： 中国矿业大学化工学院;
【基金】：国家自然科学基金资助项目(51374205,51604272) 江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
【分类号】：TD923;TD94
本文编号：2513715
[Abstract]:In order to strengthen lignite flotation, a new flotation method by introducing ultrasonic wave into flotation pulp was put forward. the results show that the yield of purified coal by ultrasonic flotation is 20.31% higher than that by conventional flotation, the ash content is reduced by 7.94%, and the grain yield of-0.045 mm is nearly tripled. The effects of ultrasonic wave on the particle size composition and surface properties of slime were studied by means of screening, scanning electron microscope, X-ray photoelectron spectroscopy and induction time tester, and the recovery mechanism of lignite flotation strengthened by ultrasonic wave was discussed in detail. The cleaning and crushing effect of ultrasonic wave on the surface of coal particles reduces the adhesion of fine mud on the surface of coal particles, but does not change the content of hydrophobic and hydrophilic functional groups on the surface of coal particles. Ultrasonic wave can produce a large number of microbubbles in flotation pulp, which can not only be adsorbed on the surface of lignite to enhance its hydrophobicity, but also increase the collision / adhesion efficiency between coal particles and bubbles. To a certain extent, the cavitation produced by ultrasonic wave can make the hydration film on the coal surface thin, unstable and easy to break, which further strengthens the flotation recovery of lignite.
【作者单位】： 中国矿业大学化工学院;
【基金】：国家自然科学基金资助项目(51374205,51604272) 江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
【分类号】：TD923;TD94
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