非离子表面活性剂对氧化煤吸附及浮选行为的影响
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摘要
为提高细粒氧化煤表面疏水性,改善浮选效果,选取了三种含有不同疏水尾链的非离子表面活性剂:C_(12)EO_(15),AC-1215,NPEO_(15),考查了初始质量浓度和吸附时间对三种表面活性剂在氧化煤表面吸附量的影响,结合FTIR和浮选实验,对比了三者在氧化煤表面的吸附差异.结果表明,疏水尾链结构对非离子表面活性剂在氧化煤表面的吸附效果有重要影响.在实验质量浓度范围内,随着三种溶剂质量浓度增大,氧化煤对溶剂的吸附量及精煤产率均提高;C_(12)EO_(15)可以显著增强氧化煤表面疏水性,浮选精煤产率由49.39%升至84.83%;NPEO_(15)次之,精煤产率最高可达81.14%;AC-1215的吸附效果一般,精煤产率最高可达58.58%.
In order to improve the surface hydrophobicity and the floatation efficiency of fine oxidized coal,three kinds of nonionic surfactants containing different hydrophobic chains including C_(12)EO_(15),AC-1215,and NPEO_(15) were selected.The effects of initial mass concentration and adsorption time on the adsorption amount of three surfactants on oxidized coal surface were investigated.FTIR and flotation experiments were carried out to compare the adsorption differences on oxidized coal surface of three surfactants.The results show that the structure of hydrophobic tail chain of nonionic surfactant has an important influence on the adsorption effect on oxidized coal surface.In the experimental mass concentration range,with the increase of the mass concentration of three solvents,the adsorption capacity and cleaned coal yield of oxidized coal both increase,C_(12)EO_(15) can significantly enhance the surface hydrophobicity of oxidized coal,the cleaned coal yield rises from 49.39% to 84.83%;and NPEO_(15) is the second,the cleaned coal yield is up to 81.14%;the adsorption effect of AC-1215 is general,and the cleaned coal yield is up to 58.58%.
In order to improve the surface hydrophobicity and the floatation efficiency of fine oxidized coal,three kinds of nonionic surfactants containing different hydrophobic chains including C_(12)EO_(15),AC-1215,and NPEO_(15) were selected.The effects of initial mass concentration and adsorption time on the adsorption amount of three surfactants on oxidized coal surface were investigated.FTIR and flotation experiments were carried out to compare the adsorption differences on oxidized coal surface of three surfactants.The results show that the structure of hydrophobic tail chain of nonionic surfactant has an important influence on the adsorption effect on oxidized coal surface.In the experimental mass concentration range,with the increase of the mass concentration of three solvents,the adsorption capacity and cleaned coal yield of oxidized coal both increase,C_(12)EO_(15) can significantly enhance the surface hydrophobicity of oxidized coal,the cleaned coal yield rises from 49.39% to 84.83%;and NPEO_(15) is the second,the cleaned coal yield is up to 81.14%;the adsorption effect of AC-1215 is general,and the cleaned coal yield is up to 58.58%.
引文
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[21]CHANG Honghong,JIA Zhigang,ZHANG Peng,et al.Interaction Between Quaternary Ammonium Surfactants with Coal Pitch and Analysis Surfactants Effects on Preparing Coal Pitch Water Slurry[J].Colloids and Surface A,2015,471(20):101-107.
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[2]NISHINO J.Adsorption of Water Vapor and Carbon Dioxide at Carboxylic Functional Groups on the Surface of Coal[J].Fuel,2001,80(5):757-764.
[3]YU Jianglong,TAHMASEBI Arash,HAN Yanna,et al.A Review on Water in Low Rank Coal:the Existence,Interaction with Coal Structure and Effects on Coal Utilization[J].Fuel Processing Technology,2013,106:9-20.
[4]郝盼,刘生玉.氧化煤对CTAB的吸附性能及表面润湿性改性[J].煤炭转化,2015,38(3):16-21.HAO Pan,LIU Shengyu.Properties of CTAB Adsorption on the Oxidized Coal and Surface Wettablity Modification[J].Coal Conversion,2015,38(3):16-21.
[5]丁起鹏,桂夏辉.高灰难选细粒煤泥分选研究现状[J].煤炭工程,2010,57(5):29-31.DING Qipeng,GUI Xiahui.Research Status of Separation of High Ash,Difficult Separated Fine Slime[J].Coal Engineering,2010,57(5):29-31.
[6]夏文成.太西氧化煤难浮机理及其可浮性改善研究[D].徐州:中国矿业大学,2014.XIA Wencheng.Difficult-to-float Mechanism and Floatability Improvement of Taixi Oxidized Coal[D].Xuzhou:China University of Mining and Technology,2014.
[7]夏阳超,刘晓阳,刘生玉,等.褐煤表面含氧官能团对水分子的吸附机理[J].煤炭转化,2016,39(4):1-9.XIA Yangchao,LIU Xiaoyang,LIU Shengyu,et al.Adsorption Mechanism of Water Molecule onto Oxygen Containing Functional Groups of Lignite[J].Coal Conversion,2016,39(4):1-9.
[8]DEV S.Enhancement in Hydrophobicity of Low Rank Coal by Surfactants-a Critical Overview[J].Fuel Processing Technology,2012,94(1):151-158.
[9]SINGH B P.The Role of Surfactant Adsorption in the Improved Dewatering of Fine Coal[J].Fuel,1999,78(4):501-506.
[10]罗道成,易平贵,陈安国,等.提高细粒褐煤造粒浮选效果的试验研究[J].煤炭学报,2002,27(4):406-411.LUO Daocheng,YI Pinggui,CHEN Anguo,et al.Experimental Study on Improving Effect of Pelleting and Flotation of Fine Grained Lignite[J].Journal of China Coal Society,2002,27(4):406-411.
[11]沈笑君,刘元晖.表面活性剂在煤浮选中应用研究[J].中国矿业,2009,18(8):82-87.SHEN Xiaojun,LIU Yuanhui.Study on the Application of Surfactant in Coal Flotation[J].China Mining Magazine,2009,18(8):82-87.
[12]MURAT E,CIGDEM C,ZEKI A.The Effect of Reagents and Reagent Mixtures on Froth Flotation of Coal Fines[J].International Journal of Mineral Processing,2003,71(1/4):131-145.
[13]唐晓燕.司班80表面活性剂预处理改善褐煤的浮选研究[J].中国煤炭,2014,40(1):95-97.TANG Xiaoyan.Research on Flotation on Improvement of Lignite Using Pretreatment by Span 80Surfactant[J].China Coal,2014,40(1):95-97.
[14]MISHRA S K,PANDA D.Studies on the Adsorption of Brij-35and CTAB at the Coal-water Interface[J].Journal of Colloid and Interface Science,2005,283(2):294-299.
[15]QU Jinzhou,TAO Xiuxiang,HE Huan,et al.Synergistic Effect of Surfactants and a Collector on the Flotation of a Low-rank Coal[J].International Journal of Coal Preparation and Utilization,2015,35(1):14-24.
[16]HO Y S,MCKAY G.Pseudo-second Order Model for Sorption Processes[J].Process Biochemistry,1999,34(5):451-465.
[17]肖进新,赵振国.表面活性剂应用原理[M].北京,化学工业出版社,2003:175-178.XIAO Jinxin,ZHAO Zhenguo.Application Principle of Surfactant[M].Beijing:Chemical Industry Press,2003:175-178.
[18]ROSEN M J,KUNJAPPU J T.表面活性剂和界面现象[M].崔正刚,蒋建中,等译.第4版.北京:化学工业出版社,2015:197-203.ROSEN M J,KUNJAPPU J T.Surfactants and Interfacial Phenomena[M].Translated by CUI Zhenggang,JIANG Jianzhong,et al.4th Edition.Beijing:Chemical Industry Press,2015:197-203.
[19]NAIK R B,JAGTAP S B,NAIK R S,et al.Effect of Non-ionic Surfactants on Thermomechanical Properties of Epoxy/multiwall Carbon Nanotubes Composites[J].Progress in Organic Coatings,2014,77:1883-1889.
[20]邢其毅,裴伟伟,徐瑞秋,等.基础有机化学(下册)[M].第3版.北京:高等教育出版社,2005:748-754.XING Qiyi,PEI Weiwei,XU Ruiqiu,et al.Fundamental Organic Chemistry(Second Part)[M].3rd Edition.Beijing:Higher Education Press,2005:748-754.
[21]CHANG Honghong,JIA Zhigang,ZHANG Peng,et al.Interaction Between Quaternary Ammonium Surfactants with Coal Pitch and Analysis Surfactants Effects on Preparing Coal Pitch Water Slurry[J].Colloids and Surface A,2015,471(20):101-107.
[22]JARRAHIAN K,SEIEDI O,SHEYKHAN M,et al.Wettability Alteration of Carbonate Rocks by Surfactants:a Mechanistic Study[J].Colloids and Surfaces A,2012,410(20):1-10.