低阶煤的表面改性及其与气泡的碰撞黏附行为
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摘要
低阶煤浮选中,通过表面改性提高煤表面的疏水性是关键,选取FO复配药剂对长焰煤表面进行改性,研究表面改性对气泡与煤表面碰撞黏附行为的影响.分析了长焰煤的表面性质和FO药剂的物理化学性质,采用自制的气-液-固三相接触测试系统对气泡与改性前后煤表面碰撞黏附的微观过程进行记录和分析,并通过浮选试验对FO药剂在煤表面的改性效果进行验证.结果表明:在改性前,气泡与煤表面的碰撞需要经过3次弹跳才能趋于稳定,但并未形成稳定的三相接触周边;经FO药剂改性后,气泡与煤表面碰撞后可以形成稳定的三相接触周边,且随着药剂质量浓度的增加,弹跳次数减少,达到最终黏附状态所用的时间也越来越短,三相接触面积由8.73 mm~2增加至14.62 mm~2.浮选验证试验表明,随着FO药剂用量的增加,精煤产率由30.34%增加至69.83%,灰分由9.89%降低至7.83%,浮选效果良好,这与碰撞黏附试验的研究效果相一致.
Surface modification is the key to improve the hydrophobicity of low-rank coal. FO compounding agent was selected to modify the surface of long-flame coal, and the influence of surface modification on the collision and adhesion process between the bubble and coal surface was studied. The surface properties of the coal and the properties of the agent were analyzed. The self-made gas-liquid-solid three phase contact test system was used to record and analyze the process of collision and adhesion between the bubble and coal surface, and the effect of modification on collision and adhesion process was verified by flotation test. It is found that before modification, three-phase contact surrounding is not formed after 3 times collision in the surface of coal. But the three-phase contact surrounding is formed after modified by FO compounding agent. With increasing the concentration of the agent, the times of collision decreases, and the time to reach the final stable state are getting shorter and shorter. The three-phase contact area also increases from 8.73 mm~2 to 14.62 mm~2. In the flotation test, the cleaned coal yield increases from 30.34% to 69.83% and the ash content decreases from 9.89% to 7.83% with the increasing concentration of the FO compounding agent. The flotation results are consistent with the study of collision and adhesion.
Surface modification is the key to improve the hydrophobicity of low-rank coal. FO compounding agent was selected to modify the surface of long-flame coal, and the influence of surface modification on the collision and adhesion process between the bubble and coal surface was studied. The surface properties of the coal and the properties of the agent were analyzed. The self-made gas-liquid-solid three phase contact test system was used to record and analyze the process of collision and adhesion between the bubble and coal surface, and the effect of modification on collision and adhesion process was verified by flotation test. It is found that before modification, three-phase contact surrounding is not formed after 3 times collision in the surface of coal. But the three-phase contact surrounding is formed after modified by FO compounding agent. With increasing the concentration of the agent, the times of collision decreases, and the time to reach the final stable state are getting shorter and shorter. The three-phase contact area also increases from 8.73 mm~2 to 14.62 mm~2. In the flotation test, the cleaned coal yield increases from 30.34% to 69.83% and the ash content decreases from 9.89% to 7.83% with the increasing concentration of the FO compounding agent. The flotation results are consistent with the study of collision and adhesion.
引文
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[2] 李甜甜.伊泰低阶煤煤泥浮选试验研究[D].徐州:中国矿业大学,2014:19-24.LI Tiantian.Study on flotation of Yi-Tai low-rank coal slime[D].Xuzhou:China University Of Mining And Technology,2014:19-24.
[3] 杨晓霞,田大香,黄银,等.低阶煤热解提质技术的研究进展[J].延安大学学报(自然科学版),2017,36(4):30-33.YANG Xiaoxia,TIAN Daxiang,HUANG Yin,et al.Research progress of low rank coal pyrolysis upgrading[J].Journal of Yanan University,2017,36(4):30-33.
[4] 曾凡虎,陈钢,李泽海,等.我国低阶煤热解提质技术进展[J].化肥设计,2013,51(2):1-7.ZENG Fanhu,Chen Gang,LI Zehai,et al.Technical progress for pyrolysis /upgrade of low rank coal in China[J].Chemical Fertilizer Design,2013,51(2):1-7.
[5] 许宁,陶秀祥,张星.微波辐照对低阶煤的表面改性作用[J].化学工程师,2018,32(5):69-74.XU Ning,TAO Xiuxiang,ZHANG Xing.Surface modification effect of microwave irradiation on low rank coal[J].Chemical Engineer,2018,32(5):69-74.
[6] 李俊龙.超声波预处理时间对煤泥浮选结果的影响[J].煤炭加工与综合利用,2011(3):7-8.LI Junlong.Influence of time retention of ultra-sonic treatment on coal flotation result[J].Coal Processing & Comprehensive Utilization,2011(3):7-8.
[7] 李振,于伟,杨超,等.低阶煤提质利用现状及展望[J].矿山机械,2013,41(7):1-6.LI Zhen,YU Wei,YANG Chao,et al.Actuality and expectation on upgrading utilization of low-rank coal[J].Mining & Processing Equipment,2013,41(7):1-6.
[8] 李响.低阶煤和生物质煤浆表面改性及其成浆特性研究[D].杭州:浙江大学,2012:26-42.LI Xiang.Surface-coating improves the coal water slurry formation of low rank coal and biomass[D].Hangzhou:Zhejiang University,2012:26-42.
[9] 李安.浅析低阶煤提质技术现状及发展[J].石化技术,2018,25(2):281.LI An.Analysis on the status and development of low-rank coal upgrading technology[J].Petrochemical Industry Technology,2018,25(2):281.
[10] LI G,CHAI S.Experimental study on preparation of ultra low ash coal by oil agglomeration[J].Journal of Heilongjiang University of Science & Technology,2017,27(4):433-437.
[11] 张迁.浮选药剂与表面改性对太西氧化无烟煤浮选效果的影响研究[J].选煤技术,2017(2):18-21.ZHANG Qian.Study of effect on performance of flotation of Taixi anthracite coal exerted by change of reagents and particle surface modification[J].Coal Preparation Technology,2017(2):18-21.
[12] KUMAR R.Recovery of iron from iron ore slimes by selective flocculation[J].Journal of the Southern African Institute of Mining and Metallurgy,2017,117(4):397-400.
[13] DEY S.Enhancement in hydrophobicity of low rank coal by surfactants-A critical overview[J].Fuel Processing Technology,2012,94(1):151-158.
[14] XIA W,YANG J,ZHU B.Flotation of oxidized coal dry-ground with collector[J].Powder Technology,2012,228(3):324-326.
[15] VAMVUKA D,AGRIDIOTIS V.The effect of chemical reagents on lignite flotation[J].International Journal of Mineral Processing,2001,61(3):209-224.
[16] 顾良荧.羧基化合物浮选煤泥[J].煤炭科学技术,1984(11):38-41.GU Liangying.Floatation of slime with carboxylic compounds[J].Coal Science and Technology,1984(11):38-41.
[17] 赵伟.神府煤煤岩组分的改性及其可浮性研究[D].西安:西安科技大学,2010:34-44.ZHAO Wei.Study on modification of macerals in Shenfu coals and its flotability[D].Xi’an:Xi’an University of Science and Technology,2010:34-44.
[18] WANG W,ZHOU Z,NANDAKUMAR K,et al.Attachment of individual particles to a stationary air bubble in model systems[J].International Journal of Mineral Processing,2003,68(1):47-69.
[19] ARIF M,JONES F,BARIFCANI A,et al.Influence of surface chemistry on interfacial properties of low to high rank coal seams[J].Fuel,2017,194:211-221.
[20] NGUYEN A V,EVANS G M.Attachment interaction between air bubbles and particles in froth flotation[J].Experimental Thermal and Fluid Science,2004,28(5):381-385.
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