超声条件下表面活性剂的选择性脱除对低阶煤泥浮选的影响
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摘要
通过C80微量热仪和微电泳仪等仪器考察了十二烷基醇聚氧乙烯醚(AEO-15)在低阶煤中有机质和矿物质表面的吸附特性,并在浮选作业前对吸附于低阶煤泥上的表面活性剂进行超声条件下的选择性脱除,以提高浮选低阶精煤品质。结果表明:超声波可以减小低阶煤泥颗粒的粒径,降低颗粒表面的负电性,增加低阶煤表面的疏水性;超声波选择性脱除表面活性剂90s后的浮选结果,同未超声脱附的浮选结果相比,精煤产率变化不大,灰分降低了1.24%(质量分数,下同),浮选完善度由34.27%增加到36.93%。处理120s的低阶煤润湿热达到最大(1.69J/g),超声脱附120s后,矸石上浮率降低了10.24%。
The adsorption characteristics of dodecyl primary alcobol ethoxylate ether(AEO-15)on the surface of organic matter and minerals in low rank coal were investigated by C80 microcalorimeter and microelectrophoresis.The surfactant adsorbed on the low rank coal was selectively removed under ultrasonic conditions prior to the flotation operation,thereby improving the quality of flotation clean coal.The results show that the ultrasound can reduce the particle size of the low rank coal slurry particles,reduce the negative electric properties of the particle surface,and increase the hydrophobicity of the low rank coal slurry surface.Compared with the coal sample flotation results without ultrasonic desorption of surfactants,the result of ultrasonic selective removal of surfactant for 90 sshows that the yield of clean coal is roughly the same,the ash mass fraction decreases by 1.24%(mass fraction,the same below),and the floatation perfect index increases from 34.27%to 36.93%.The wetting heat value of low rank coal treated for 120 s reaches the maximum value for 1.69 J/g.After 120 sof ultrasonic desorption,the gangue floating rate is reduced by 10.24%.
The adsorption characteristics of dodecyl primary alcobol ethoxylate ether(AEO-15)on the surface of organic matter and minerals in low rank coal were investigated by C80 microcalorimeter and microelectrophoresis.The surfactant adsorbed on the low rank coal was selectively removed under ultrasonic conditions prior to the flotation operation,thereby improving the quality of flotation clean coal.The results show that the ultrasound can reduce the particle size of the low rank coal slurry particles,reduce the negative electric properties of the particle surface,and increase the hydrophobicity of the low rank coal slurry surface.Compared with the coal sample flotation results without ultrasonic desorption of surfactants,the result of ultrasonic selective removal of surfactant for 90 sshows that the yield of clean coal is roughly the same,the ash mass fraction decreases by 1.24%(mass fraction,the same below),and the floatation perfect index increases from 34.27%to 36.93%.The wetting heat value of low rank coal treated for 120 s reaches the maximum value for 1.69 J/g.After 120 sof ultrasonic desorption,the gangue floating rate is reduced by 10.24%.
引文
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[18]王宝俊,李敏,赵清艳,等.煤的表面电位与表面官能团间的关系[J].化工学报,2004,55(8):1329-1334.WANG Baojun,LI Min,ZHAO Qingyan,et al.Relationship Between Surface Potential and Functional Groups of Coals[J].Journal of Chemical Industry and Engineering(China),2004,55(8):1329-1334.
[19]刘晓阳,刘生玉,夏阳超.褐煤润湿性及水分复吸的量热法研究[J].煤炭转化,2017,40(3):8-14.LIU Xiaoyang,LIU Shengyu,XIA Yangchao.Calorimetry Investigation on Wettability and Moisture Re-adsorption of Lignite[J].Coal Conversion,2017,40(3):8-14.
[20]刘雪粉,俞云良,陆向红,等.超声波应用于吸附/脱附过程的研究进展[J].化工进展,2006(6):639-645.LIU Xuefen,YU Yunliang,LU Xianghong,et al.Research Progress of Ultrasound Application to Adsorption/desorption Process[J].Chemical Industry and Engineering Progress,2006(6):639-645.
[21]KOPPARTHI P,BALAMURUGAN S,MUKHERJEE A K.Effect of Ultrasonic Pre-treatment Time on Coal Flotation[J].International Journal of Coal Preparation and Utilization,2017:1-17.
[22]BREITBACH M,BATHEN D,SCHMIDT-TRAUB H.Desorption of a Fixed-bed Adsorber by Ultrasound[J].Ultrasonics,2002,40(1/2/3/4/5/6/7/8):679-682.
[2]仇欢欢,刘生玉.含氧基团含量对褐煤水分回吸性能的影响研究[J].煤炭科学技术,2014,42(3):103-107.QIU Huanhuan,LIU Shengyu.Research on Oxygen-containing Functional Groups Content Affected to Lignite Moisture Readsorption Performance[J].Coal Science and Technology,2014,42(3):103-107.
[3]CRAWFORD R J,MAINWARING D E.The Influence of Surfactant Adsorption on the Surface Characterisation of Australian Coals[J].Fuel,2001,80(3):313-320.
[4]李少章,朱书全.低阶煤泥浮选的研究[J].煤炭工程,2004,51(12):60-62.LI Shaozhang,ZHU Shuquan.Study of Low-rank Coal Flotation[J].Coal Engineering,2004,51(12):60-62.
[5]马壮,栗褒,郭建英,等.非离子表面活性剂对氧化煤吸附及浮选行为的影响[J].煤炭转化,2018,41(3):38-43.MA Zhuang,LI Bao,GUO Jianying,et al.Effects of Nonionic Surfactants on Adsorption and Flotation Behavior of Oxidized Coal[J].Coal Converison,2018,41(3):38-43.
[6]曹学锋,刘长淼,胡岳华.十二系列叔胺捕收剂对高岭石的浮选研究[J].中国工程科学,2011,13(1):93-97.CAO Xuefeng,LIU Changmiao,HU Yuehua.Research on the Flotation of Kaolinite Using a Series of Dodecyl Tertiary Amines[J].Engineering Sciences,2011,13(1):93-97.
[7]栗褒,刘晓阳,刘生玉.界面润湿性调控对氧化煤浮选的促进作用[J].矿产综合利用,2017,38(3):105-110.LI Bao,LIU Xiaoyang,LIU Shengyu.Promoting Effects of Wettability Modification on Oxidized Coal Flotation[J].Multipurpose Utilization of Mineral Resources,2017,38(3):105-110.
[8]李本钢,陈正国.表面活性剂溶液动态表面张力及吸附动力学研究[J].化学进展,2005,17(2):233-241.LI Ben’gang,CHEN Zhengguo.Advance on the Study of Dynamic Surface Tension and Adsorption Kinetics of Surfactant Solution[J].Progress in Chemistry,2005,17(2):233-241.
[9]HARRIS G H,DIAO J,FUERSTENAU D W.Coal Flotation with Nonionic Surfactants[J].Coal Preparation,1995,16(3/4):135-147.
[10]吕沛超,卢毅屏,冯博,等.超声波作用下金川硫化镍矿浮选动力学研究[J].有色金属(选矿部分),2014,66(3):58-61.LYU Peichao,LU Yiping,FENG Bo,et al.Flotation Kinetics Study of Jinchuan Nickel Sulfide Ores Under Ultrasonication[J].Nonferrous Metals(Mineral Processing Section),2014,66(3):58-61.
[11]何桂春,毛益平,倪文.超声波技术在选矿中的应用[J].金属矿山,2003(12):40-43.HE Guichun,MAO Yiping,NI Wen.Application of Ultrasonic Technology in Mineral Processing[J].Engineering Sciences,2003(12):40-43.
[12]马永义,王毓华.超声波预处理对不同体系中方铅矿浮选行为的影响[J].矿冶工程,2018(3):58-62.MA Yongyi,WANG Yuhua.Influence of Ultrasonic Pretreatment on Flotation Behavior of Galena[J].Mining and Metallurgical Engineering,2018(3):58-62.
[13]和晓才,谢刚,李怀仁,等.超声波对盐酸脱除氧化铝中铁、硅的影响[J].湿法冶金,2015,34(2):142-145.HE Xiaocai,XIE Gang,LI Huairen,et al.Influence of Removal of Iron,Silicon from Alumina by Ultrasonic[J].Hydrometallurgy of China,2015,34(2):142-145.
[14]谢广元.选矿学[M].徐州:中国矿业大学出版社,2012:60-63.XIE Guangyuan.Xuan Kuang Xue[M].Xuzhou:China University of Mining and Technology Press,2012:60-63.
[15]康文泽,吕玉庭.超声波处理对煤泥特性的影响研究[J].中国矿业大学学报,2006,35(6):783-786.KANG Wenze,LYU Yuting.Effect of Ultrasonic Treatment on Slime Characteristics[J].Journal of China University of Mining and Technology,2006,35(6):783-786.
[16]PENG Yaoli,MAO Yuqiang,XIA Wencheng,et al.Ultrasonic Flotation Cleaning of High-ash Lignite and Its Mechanism[J].Fuel,2018:558-566.
[17]康文泽,路迈西,李哲,等.超声波作用下的矿浆性质研究[J].煤炭科学技术,2005,33(10):67-68.KANG Wenze,LU Maixi,LI Zhe,et al.Research on Slurry Property Under Function of Ultrasonic Wave[J].Coal Science and Technology,2005,33(10):67-68.
[18]王宝俊,李敏,赵清艳,等.煤的表面电位与表面官能团间的关系[J].化工学报,2004,55(8):1329-1334.WANG Baojun,LI Min,ZHAO Qingyan,et al.Relationship Between Surface Potential and Functional Groups of Coals[J].Journal of Chemical Industry and Engineering(China),2004,55(8):1329-1334.
[19]刘晓阳,刘生玉,夏阳超.褐煤润湿性及水分复吸的量热法研究[J].煤炭转化,2017,40(3):8-14.LIU Xiaoyang,LIU Shengyu,XIA Yangchao.Calorimetry Investigation on Wettability and Moisture Re-adsorption of Lignite[J].Coal Conversion,2017,40(3):8-14.
[20]刘雪粉,俞云良,陆向红,等.超声波应用于吸附/脱附过程的研究进展[J].化工进展,2006(6):639-645.LIU Xuefen,YU Yunliang,LU Xianghong,et al.Research Progress of Ultrasound Application to Adsorption/desorption Process[J].Chemical Industry and Engineering Progress,2006(6):639-645.
[21]KOPPARTHI P,BALAMURUGAN S,MUKHERJEE A K.Effect of Ultrasonic Pre-treatment Time on Coal Flotation[J].International Journal of Coal Preparation and Utilization,2017:1-17.
[22]BREITBACH M,BATHEN D,SCHMIDT-TRAUB H.Desorption of a Fixed-bed Adsorber by Ultrasound[J].Ultrasonics,2002,40(1/2/3/4/5/6/7/8):679-682.