油泡-低阶煤颗粒间的黏附特性

发布时间：2018-07-06 12:44

本文选题：低阶煤 + 油泡/活性油泡　；参考：《煤炭学报》2017年03期

【摘要】：在浮选矿浆中矿物颗粒能够有效地黏附在气泡上完成矿化过程是浮选技术的关键。用油泡代替气泡,研究难浮低阶煤颗粒与油泡间的相互作用及其黏附特性对于弄清其矿化机制至关重要。从矿物表面电性入手,探究了溶液p H值和表面活性剂对煤样与油泡间作用力的影响,运用DLVO理论计算了相互作用力的大小,并通过诱导时间这一重要参数评价了黏附效率。实验结果表明,DLT煤样和油泡的等电点分别出现在p H值2~3和p H值3~5之间;当p H=3时溶液中煤样与油泡之间的相互作用不存在能垒;p H3时开始出现能垒,并随p H值的增大而增大。2-乙基己醇和双十二烷基二甲基溴化铵的加入能够有效地减小煤样与油泡之间的能垒并降低诱导时间,最大降幅分别为74.35%和86.45%。
[Abstract]:The key of flotation technology is that mineral particles can be effectively adhered to bubbles to complete the mineralization process in flotation slurry. It is very important to study the interaction between low rank coal particles and oil bubbles and their adhesion characteristics in order to understand the mineralization mechanism. Based on the electrical properties of mineral surface, the effects of solution pH value and surfactant on the interaction force between coal sample and oil bubble were investigated. DLVO theory was used to calculate the magnitude of the interaction force, and the adhesion efficiency was evaluated by the important parameter of induction time. The experimental results show that the isoelectric points of DLT coal sample and oil bubble appear between pH value 2 / 3 and pH value 3 / 5 respectively, and energy barriers begin to appear when the interaction between coal sample and oil bubble does not exist in solution with pH = 3. With the increase of pH value, the addition of .2-ethylhexanol and bis-dodecyl dimethylammonium bromide can effectively reduce the energy barrier between the coal sample and the oil bubble and reduce the induction time, with the largest decreases of 74.35% and 86.45%, respectively.
【作者单位】：煤炭加工与高效利用教育部重点实验室;中国矿业大学化工学院;
【基金】：国家自然科学基金资助项目(51574235) 煤炭加工与高效洁净利用教育部重点实验室开放基金资助项目(CPEUKF1405)
【分类号】：TD94;TD923

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