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Improving bubble-particle attachment during the flotation of low rank coal by surface modification

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International Journal of Mining Science and Technology 2020年第2期30卷 217-223页

作者： Haishan Hu Ming Li Lulu Li xiuxiang tao School of Chemical Engineering&Technology China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China

Based on the problems caused by many oxygen-containing functional groups and poor floatability on the surface of low rank coal,the characteristics of low rank coal were analyzed systematically by means of scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-Ray photoelectron spectroscopy(XPS)*** bubble-particle induction time was used to determine the characterization of the bubble-particle attachment,and the bubble-particle attachment of low rank coal modified by soaking the coal samples in an acid or alkaline solution was *** floatability of the modified coal surface was verified by flotation *** results show that the particle size of 0.125–0.074 mm of the coal sample exhibited better bubble-particle attachment *** small bubble,the larger approach velocity of bubble and the larger bubble deformation were more helpful to enhance the bubbleparticle *** an acid solution,the smaller the p H was and the longer the soaking time was,the better the floatability of the coal sample and the higher the combustible material recovery *** combustible material recovery of low rank coal was increased to 78.79%by soaking the sample in an acid solution of pH=0 for 180 *** the contrary there was a best concentration for the alkaline solution.

关键词： Low rank coal Induction time Modification Flotation Bubble-particle attachment

Effects of magnetic field on fluidization properties of magnetic pearls

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China Particuology 2007年第1期5卷 151-155页

作者： Maoming Fan Zhenfu Luo Yuemin Zhao Qingru Chen Daniel tao xiuxiang tao Zhenqiang Chen Department of Mining Engineering University of Kentucky 230 Mining and Mineral Resources Building Lexington KY 40506 USA School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221008 Jiangsu China

An experimental study of the influence of external magnetic field on the fluidization behavior of magnetic pearls was carried out. Magnetic pearls are a magnetic form of iron oxide that mainly consists of Fe2O3 which are recovered from a high-volume power plant fly ash from pulverized coal combustion. Due to its abundance, low price and particular physical and chemical properties, magnetic pearls can be used as a heavy medium for minerals or solid waste dry separation based on density difference. This paper introduces the properties of magnetic pearls and compares the performance of magnetic pearls fluidised bed operation with or without an external magnetic field. Experimental results show that an external magnetic field significantly improves the fluidization performance of magnetic pearls such as uniformity and stability.

关键词： Magnetic pearls Magnetic field Fluidization properties Gravity separation

Progress of the technique of coal microwave desulfurization

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International Journal of Coal Science & Technology 2014年第1期1卷 113-128页

作者： xiuxiang tao Ning Xu Maohua Xie Longfei Tang Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering and TechnologyChina University of Mining and TechnologyXuzhou 221116China

With the advantages of its fast speed,effective and moderate controllable conditions,desulfurization of coal by microwave has become research focus in the field of clean coal *** is a homogeneous mixture which consists of various components with different dielectric properties,so their abilities to absorb microwaves are different,and the sulfur-containing components are better absorbers of microwave,which makes them can be selectively heated and reacted under microwave *** still remain controversies on the principle of microwave desulfurization at present,thermal effects or non-thermal *** point of thermal effects of microwave is mainly base on its characters of rapidly and selectly ***,in view of non-thermal effect,direct interactions between the microwave electromagnetic field and sulfur containing components are *** is a fundamental problem to determine the dielectric properties of coal and the sulfur-containing components to reveal the interaction of microwave and sulfur-containing ***,the test of dielectric property of coal is affected by many factors,which makes it difficult to measure dielectric properties *** order to achieve better desulfurization effect,the researchers employ methods of adding chemical additives such as acid,alkali,oxidant,reductant,or changing the reaction atmosphere,or combining with other methods such as magnetic separation,ultrasonic and *** in this field have also put forward several processes,and have obtained a number of *** of microwave desulfurization mechanism,uncertainties in qualitative and quantitative analysis of sulfur-containing functional groups in coal,and the lack of special microwave equipment have limited further development of microwave desulfurization technology.

关键词： Microwave desulfurization Dielectric properties Microwave effects Clean coal

Degradation of lignite model compounds by the action of white rot fungi

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Mining Science and Technology 2010年第1期20卷 76-81页

作者： DU Ying, tao xiuxiang, SHI Kaiyi, LI Yang School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221000, China [a] School of Chemical Engineering Technology China University of Mining & Technology Xuzhou 221000 China

Three compounds modeled on the lignite structure were chosen for experimental degradation by different fungi strains. Culture conditions and extracellular enzyme activities were optimized. The growth curves of the strains were determined to study mycelium dry weight and protein content changes. Gas chromatography and infrared spectroscopy were used to detect changes of functional groups before and after the action of the fungi on the model compounds. Possible decomposition products and degrada-tion mechanisms were proposed. The research findings show that C. Versicolor and Golden Mushroom can grow in presence of the model compounds. The optimum culture conditions were a pH of 6.0, a carbon-nitrogen ratio of five and a Tween-80 concentration of 0.1%. Newly produced substances were found by gas chromatography. Infrared analysis showed that the model compounds degraded under the action of the microorganisms.

关键词： coal biotransformation white rot fungi mechanism model compound

切换溶剂2-(二丁基氨基)乙醇萃取微藻油脂研究

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中国矿业大学学报 2015年第6期44卷 1113-1118页

作者：杜莹陶秀祥何环中国矿业大学化工学院煤炭加工与高效洁净利用教育部重点试验室江苏徐州221116 特文特大学科学与技术学院

检测了2-（二丁基氨基）乙醇（DBAE）的切换性质,对切换产物进行FT-IR分析,研究了溶剂回收的方法,以DBAE为萃取剂、CO2为触发物,对微藻Desmodesmus sp.湿藻液进行油脂萃取,研究了时间、温度、溶剂与原料比对油脂萃取得率的影响,并用GC-M... 详细信息

检测了2-（二丁基氨基）乙醇（DBAE）的切换性质,对切换产物进行FT-IR分析,研究了溶剂回收的方法,以DBAE为萃取剂、CO2为触发物,对微藻Desmodesmus sp.湿藻液进行油脂萃取,研究了时间、温度、溶剂与原料比对油脂萃取得率的影响,并用GC-MS对萃取所得油脂的成分进行了分析.结果表明：通入和移除CO2可实现DBAE疏水性和亲水性的性质切换;在80℃通入N2时,DBAE回收率为87.5%,以体积比10∶1（水∶正庚烷）向水中加入正庚烷回收DBAE,回收率可达98.3%;80℃条件下DBAE萃取微藻油脂得率比25℃时高5-6倍,为5.64%;GC-MS结果显示油酸的质量分数最高可达38.77%,其次为棕榈酸和亚油酸,分别为20.92%和20.62%.

关键词：微藻萃取切换溶剂 2-(二丁基氨基)乙醇油脂

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高密度浓相流化床中气泡的兼并与分裂特性

化学反应工程与工艺 2005年第1期21卷 37-42页

作者：陶秀祥赵跃民丁玉骆振福中国矿业大学化工学院江苏徐州221008

利用先进的高速动态分析系统对二维床中气泡的行为进行了研究,通过对所拍摄图象的分析处理,得到了不同介质流化床内形成的气泡形状、大小、聚并及分裂的基本规律和特点,实验研究表明,气泡的兼并主要是两气泡间的合并、被合并气泡总是从... 详细信息

利用先进的高速动态分析系统对二维床中气泡的行为进行了研究,通过对所拍摄图象的分析处理,得到了不同介质流化床内形成的气泡形状、大小、聚并及分裂的基本规律和特点,实验研究表明,气泡的兼并主要是两气泡间的合并、被合并气泡总是从气泡的尾涡区曳人气泡;气泡分裂主要发生在操作气速较大或大气泡中,是由于其顶部粒子流(或“剪切流”)的侵入造成的;操作气速较低,粒度、密度较大粒子形成的流化床更易于造成气泡的湮灭。

关键词：流化床气泡分裂兼并高密度浓相动态分析系统分析处理实验研究剪切流粒子流合并气速操作聚并尾涡

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煤炭微波脱硫前后硫形态的变化规律

煤炭转化 2015年第2期38卷 79-82页

作者：谢茂华陶秀祥许宁中国矿业大学化工学院江苏徐州硕士生221116 煤炭加工与高效洁净利用教育部重点实验室江苏徐州221116

结合XPS和FTIR分析微波联合不同浸提剂脱硫前后,煤中硫的赋存形态和变化规律.结果表明,新峪精煤中硫主要以噻吩、R—O—S—S—R′和无机硫的形式存在;微波联合HAc+H2O2的脱硫率明显高于微波联合NaOH的脱硫率.经微波联合HAc+H2O2处理后,... 详细信息

结合XPS和FTIR分析微波联合不同浸提剂脱硫前后,煤中硫的赋存形态和变化规律.结果表明,新峪精煤中硫主要以噻吩、R—O—S—S—R′和无机硫的形式存在;微波联合HAc+H2O2的脱硫率明显高于微波联合NaOH的脱硫率.经微波联合HAc+H2O2处理后,煤中噻吩和R—O—S—S—R′显著降低,并新生成了二苯氧硫和硫酸铁.经微波联合NaOH处理后,噻吩和R—O—S—S—R′含量有所降低,而硫酸铁和无机硫含量有所升高.同时对脱硫机理进行了探讨.

关键词：微波脱硫硫形态 XPS FTIR

基于XANES分析煤炭微波脱硫前后硫形态的变化

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中国煤炭 2014年第2期40卷 82-84,97页

作者：许宁陶秀祥谢茂华中国矿业大学化工学院江苏省徐州市221116 煤炭加工与高效洁净利用教育部重点实验室江苏省徐州市221116

煤炭微波脱硫是当前洁净煤技术研究的热点,但目前对煤炭微波脱硫过程中硫形态的变化规律尚不完全清楚,本文采用同步辐射XANES方法分析微波脱硫前后煤中硫的赋存形态及其变化规律。结果显示,煤中硫主要以噻吩环、巯基(-SH)、亚硫酰基(S=O... 详细信息

煤炭微波脱硫是当前洁净煤技术研究的热点,但目前对煤炭微波脱硫过程中硫形态的变化规律尚不完全清楚,本文采用同步辐射XANES方法分析微波脱硫前后煤中硫的赋存形态及其变化规律。结果显示,煤中硫主要以噻吩环、巯基(-SH)、亚硫酰基(S=O)以及硫酸盐类矿物质的形式存在,经过微波脱硫后煤中含硫基团中噻吩类硫和巯基类硫含量降低,亚硫酰基类硫和硫酸盐类含量增加,煤中含硫基团向硫的氧化态转化。

关键词：煤炭微波脱硫 X射线吸收精细结构光谱硫形态

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胜利褐煤的改性油泡浮选机理

煤炭学报 2018年第3期43卷 824-830页

作者：杨曌陈松降陶秀祥陈亮李路路煤炭加工与高效利用教育部重点实验室江苏徐州221116 中国矿业大学化工学院江苏徐州221116

针对胜利褐煤亲水性强、可浮性差的特点,从降低表面亲水性入手,采用2-乙基己醇、2-辛酮和苯乙酸甲酯对普通柴油油泡进行了改性,通过诱导时间对改性油泡的黏附性能进行了表征,借助傅里叶变换红外光谱技术分析了表面活性剂的吸附位点,并... 详细信息

针对胜利褐煤亲水性强、可浮性差的特点,从降低表面亲水性入手,采用2-乙基己醇、2-辛酮和苯乙酸甲酯对普通柴油油泡进行了改性,通过诱导时间对改性油泡的黏附性能进行了表征,借助傅里叶变换红外光谱技术分析了表面活性剂的吸附位点,并通过计算基团电负性进行了药剂吸附方式的分析,丰富了低阶煤油泡浮选的基础理论。实验结果表明:2-乙基己醇和2-辛酮改性的油泡对褐煤的诱导时间可以降低至40 ms左右,在相同的药剂消耗下,改性油泡比普通油泡的可燃体回收率最高增幅超过60%。FT-IR的分析表明表面活性剂能够抑制褐煤表面—OH的亲水作用,从而提高其可浮性。结合各项测试和基团电负性计算的结果进行分析,可以认为醇—OH能够与煤表面O发生氢键作用,能有效降低亲水性;2-辛酮在高浓度配比下有良好的效果;苯乙酸甲酯中的苯环容易吸附到褐煤的疏水表面,会对药剂中含氧基团的作用效果起到负面影响。

关键词：褐煤改性油泡诱导时间 FT-IR分析基团电负性