Gemini表面活性剂在地沟油制备微乳捕收剂中的应用
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摘要
为实现低阶煤泥的高效浮选,以地沟油、Gemini阳离子表面活性剂(31709型表面活性剂)为主要原料制备新型高效微乳捕收剂(DG-1),检测结果表明,微乳液滴体积分数在98%以上,稳定性良好。浮选实验及成本利益概算表明,在药剂用量相同时,DG-1的浮选性能及所获精煤利润均优于0#柴油,其浮选性能的提高与31709型表面活性剂的添加密切相关。使用X射线光电子能谱仪(XPS)、接触角测量仪和微电泳仪对31709型表面活性剂提高DG-1浮选性能进行研究,结果表明,31709型表面活性剂有效覆盖了样品表面的含氧官能团,造成煤泥表面氧元素的含量减少,提高了煤泥的疏水性;吸附31709型表面活性剂后煤泥接触角增大了约12°,进一步验证了吸附后煤泥疏水性的增强;同时31709型表面活性剂对煤粒具有一定的分散作用,比煤粒单纯在水中更稳定,有利于浮选。
In order to achieve high flotation efficiency of low rank coal slime,swill-cooked dirty oil,Gemini cationic surfactants( 31709 surfactants) were used as main raw materials in synthesis of a new type high-efficiency micro-emulsion collector( DG-1),test result illustrated that the volume fraction of micro-emulsion droplets were more than 98% and had good stability. Flotation experiments and cost-benefit estimates demonstrated that the flotation performance and clean-coal profit of DG-1 were all better than 0# diesel when the dosage of collectors were the same,the improvement of DG-1 flotation performance was closely related to the adjunction of 31709 surfactants. X-ray photoelectron spectroscopy( XPS),contact angle meter and microiontophoresis apparatus were used to investigate that 31709 surfactants promote flotation performance of DG-1,the results illustrated that 31709 surfactants efficiently cover oxygen-containing functional groups, inducing the reduction of oxygen content on coal slime surfaces and the enhancement of the hydrophobicity of coal slime; the contact angle of coal slime increased about 12° after adsorbing 31709 surfactants,which further verified the enhancement of hydrophobicity of coal slime after adsorption; meanwhile,31709 surfactants promoted the dispersal of coal slime and increased the stability of coal slime,which were favorable for the improvement of coal slime flotation.
In order to achieve high flotation efficiency of low rank coal slime,swill-cooked dirty oil,Gemini cationic surfactants( 31709 surfactants) were used as main raw materials in synthesis of a new type high-efficiency micro-emulsion collector( DG-1),test result illustrated that the volume fraction of micro-emulsion droplets were more than 98% and had good stability. Flotation experiments and cost-benefit estimates demonstrated that the flotation performance and clean-coal profit of DG-1 were all better than 0# diesel when the dosage of collectors were the same,the improvement of DG-1 flotation performance was closely related to the adjunction of 31709 surfactants. X-ray photoelectron spectroscopy( XPS),contact angle meter and microiontophoresis apparatus were used to investigate that 31709 surfactants promote flotation performance of DG-1,the results illustrated that 31709 surfactants efficiently cover oxygen-containing functional groups, inducing the reduction of oxygen content on coal slime surfaces and the enhancement of the hydrophobicity of coal slime; the contact angle of coal slime increased about 12° after adsorbing 31709 surfactants,which further verified the enhancement of hydrophobicity of coal slime after adsorption; meanwhile,31709 surfactants promoted the dispersal of coal slime and increased the stability of coal slime,which were favorable for the improvement of coal slime flotation.
引文
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[3]Wang H. Improvement in Flotation and Filterability of Fine Coal Slime by Selective Flocculation[J]. Journal of Mining Science,2003,39(4):410-414.
[4]Ozkan S G. Effects of simultaneous ultrasonic treatment on flotation of hard coal slimes[J]. Fuel,2012,93(1):576-580.
[5]?inar M. Floatability and desulfurization of a low-rank(Turkish)coal by low-temperature heat treatment[J]. Fuel Processing Technology,2009,90(10):1300-1304.
[6]陈飞,洪美玲.我国煤用浮选机的应用现状与发展趋势[J].煤炭加工与综合利用,2011(6):31-33.
[7]Hacifazlioglu H. Recovery of Coal from Cyclone Overflow Waste Coals by Using a Combination of Jameson and Column Flotation[J]. Energy Sources,2011,33(22):2044-2057.
[8]Das A,Singh R,Bhattacharyya K K. Split Processing of High Ash Indian Coking Coal Fines Using Jameson Flotation Cell[J].Mineral Processing&Extractive Metallurgy Review, 2010, 32(1):17-23.
[9]董宪姝,杜圣星.高灰细泥细粒煤浮选技术进展[J].选煤技术,2012(5):110-114.
[10]张晓华,李紫微. ZNX-K07捕收剂在大屯选煤厂的工业实验[J].选煤技术,2014(1):27-29.
[11]荀海鑫,康文泽,刘松阳. AO捕收剂对稀缺难浮煤泥的捕收效果研究[J].煤炭科学技术,2012,40(8):118-120.
[12]崔广文,于文慧,张玉,等.煤泥浮选药剂研究现状及发展趋势[J].洁净煤技术,2015,21(1):15-19.
[13]朱玉霜,朱建光.浮选药剂的化学原理[M].长沙:中南工业大学出版社,1987.
[14]Laskowski J S,Yu Z. Oil agglomeration and its effect on beneficiation and filtration of low-rank/oxidized coals[J]. International Journal of Mineral Processing,2000,58(1):237-252.
[15]Boylu F,Laskowski J S. Rate of water transfer to flotation froth in the flotation of low-rank coal that also requires the use of oily collector[J]. International Journal of Mineral Processing,2007,83(3-4):125-131.
[16]符东旭,朱书全,贺兰鸿,等. ZFC乳化油对东庞煤泥浮选性能的研究[J].选煤技术,2010(5):9-11.
[17]王杰.乳化药剂对煤泥浮选的影响[J].煤炭加工与综合利用,2010(3):18-20.
[18]康文泽,王慧,孔小红,等.超声乳化煤油的浮选性能研究[J].煤炭学报,2008,33(1):89-93.
[19]崔广文,王京发,王乐明,等.新型煤泥浮选自乳化捕收剂SEC的应用研究[J].选煤技术,2014(3):6-8.
[20]刘明.几种典型水溶液分散体系的Zeta电位及其稳定性研究[D].武汉:武汉理工大学,2010.