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Eutectic effect during mesophase formation in co-carbonization of ethylene tar pitch and polystyrene

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International Journal of Mining Science and Technology 2012年第2期22卷 183-186页

作者： Cheng Xianglin song shulei Key Laboratory of Coal Processing&Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China High Tech Research Institution of China University of Mining&Technology&The City of Lianyungang Xuwei New Area Xuzhou 221116China

Ethylene tar pitch was co-carbonized with waste polystyrene to prepare mesophase pitch. The character- istics of mesophase pitches were examined using polarized light optical microscopy, apparent viscome- try, Fourier transform infrared spectrometry, IH nuclear magnetic resonance spectrometry, and X-ray diffractometry. The properties of the mesophase pitch were greatly improved because of the eutectic effect. The soluble content increased from 5% to 56%, the mesophase itself increased from 32% to 100%, and the optical texture was changed from a coarse mosaic into a flow domain after the waste polystyrene was added to the ethylene tar pitch. The apparent viscosity showed that the mesophase pitch changed from thixotropic to Newtonian suggesting improved rheological behavior during co-carbonization）The increased number of alkyl groups, which are mainly methylene groups, altered the molecular structure of the mesophase pitch in a way that resulted in the eutectic effect.

关键词： Eutectic effectEthylene tar pitchWaste polystyreneCo-carbonizationMesophase pitch

Occurrence characteristics of mercury in high-mercury coal and distribution rule of mercury in products of an air dense medium fluidized bed

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International Journal of Mining Science and Technology 2018年第6期28卷 1015-1020页

作者： Guilin Zhang shulei song Weiqiao Yang Bo Zhang Jianqing Wang Key Laboratory of Coal Processing & Efficient Utilization Ministry of EducationChina University of Mining and Technology

Mercury emitted from direct combustion of high-mercury coal does great harm to the environment. To make good use of high-mercury coal, it is necessary to study the occurrence characteristics of mercury in coal and high-efficient methods of mercury removal. In this paper, high-mercury coal of Guizhou Province of China was taken as an object to study the nature of mercury in coal and the rule of mercury removal by dry preparation method. Mercury mainly distributes in the medium and high density fractions, and has a good affinity with silicon, aluminum, iron, titanium, potassium, calcium, zinc, sodium and magnesium. It exists in minerals formed by these elements and presents significant correlation with ash in coal. After the high-mercury coal is separated by air dense medium fluidized bed, mercury content of clean coal is reduced to 1/10 of raw coal, while mercury content of gangue is increased to 3 times that of raw coal. This indicates that mercury in raw coal is rejected greatly by ADMFB and enriched in highdensity fractions. The rates of ash removal and mercury removal decrease with the density and present a very high correlation.

关键词： Occurrence of mercury Affinity Air dense medium fluidized bed Correlation of mercury and ash removal Distribution rule of mercury

Effects of sintered metal distributor on fluidization quality of the air dense medium fluidized bed

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Mining Science and Technology 2011年第5期21卷 681-685页

作者： Yang Xuliang Zhao Yuemin Luo Zhenfu Chen Zengqiang song shulei School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221008 China

Dry coal beneficiation using an air dense medium fluidized bed (ADMFB) requires the formation of a sta- ble and uniform bed from the dense medium. Others have shown that the structure and geometric parameters of the air distributor have a significant influence on the experimentally observed fluidization quality. In this study we used a sintered metal distributor (SMD) in the ADMFB separator and study its effect on the fluidization quality. The results show that for the same open area ratio (OAR), a smaller aper- ture in the SMD will provide improved fluidization quality. If aperture size is held constant bigger open area ratios result in improved fluidization quality. And, the fluidization quality also improves when the pressure drop across the SMD increases. A model relating distributor pressure drop and the geometric parameters of the SMD is also proposed.

关键词： Sintered metal distributorAir distributorAir dense medium fluidized bedDry coal beneficiation

New progress in the processing and efficient utilization of coal

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Mining Science and Technology 2011年第4期21卷 547-552页

作者： Zhao Yuemin Liu Jiongtian wei xianyong Luo Zhenfu Chen Qingru song shulei Key Laboratory of Coal Processing Er Efficient Utilization of Ministry of Education China University of Mining ＆ Technology Xuzhou 221116 China

Coal accounts for about 70% of the primary energy sources in China. The environmental pollution and resources waste involved with coal processing and utilization are serious. It is therefore urgent to develop highly-efficient coal resources utilization theory and methods with low-carbon discharge. Based on our long-term basic research and technology development, the progress in beneficiation, cleaning, and trans- formation of coal, which includes dense phase fluidized bed dry beneficiation, deep screening of wet fine coal, micro-bubble flotation column separation, molecular coal chemistry, and transformation and sepa- ration of coal and its derivatives into value-added chemicals under mild conditions, is discussed.

关键词： Coal Low-carbon discharge Separation Coal conversion

Progress in developments of dry coal beneficiation

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International Journal of Coal Science & Technology 2014年第1期1卷 103-112页

作者： Yuemin Zhao Xuliang Yang Zhenfu Luo Chenlong Duan shulei song School of Chemical Engineering&Technology China University of Mining&TechnologyXuzhou 221116China

China’s energy supply heavily relies on coal and China’s coal resource and water resource has a reverse *** problem of water shortages restricts the applications of wet coal beneficiation technologies in drought *** present situation highlights the significance and urgency of developing dry beneficiation technologies of ***,other countries that produce large amounts of coal also encounter serious problem of lack of water for coal beneficiation,such as American,Australia,Canada,South Africa,Turkey and ***,dry coal beneficiation becomes the research hot-points in the field of coal cleaning worldwide in recent *** paper systematically reviewed the promising research efforts on dry coal beneficiation reported in literature in last 5 years and discussed the progress in developments of dry coal beneficiation ***,we also elaborated the prospects and the challenges of the development of dry coal beneficiation.

关键词： Dry coal beneficiation Air dense medium fluidized bed Density segregation Vibrated fluidized bed

Motion behavior of particles in air-solid magnetically stabilized fluidized beds for separation

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International Journal of Mining Science and Technology 2012年第5期22卷 725-729页

作者： song shulei a,,Zhao Yuemin a,Luo Zhenfu a,Tang Ligang b a School of Chemical Engineering and Technology,China University of Mining & Technology,Xuzhou 221116,China b Coal Mining and Designing Department,Tiandi Science & Technology Company Co.Ltd.,Beijing 100013,China School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China Coal Mining and Designing Department Tiandi Science & Technology Company Co. Ltd. Beijing 100013 China

In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing *** results show that the main resistance forces as the tracing particles settled in an air-solid MSFB were motion resistance force and yield *** motion resistance and yield forces greatly hindered the free settling of the particles by greatly decreasing the acceleration for settling process of the *** acceleration decreased from 3022.62 cm/s 2 to zero in 0.1 s,and in the end,the particles stopped in the air-solid *** yield force on particles increased with increasing the magnetic field intensity,resulting in decrease of the quasi-zero settling ***,the yield force on particles decreased with increasing the fluidized air velocity,leading to increase of the quasi-zero settling *** the structure and operating parameters of the air-solid MSFB were set up,the yield stress on particles stopped in an air-solid MSFB was a function of diameter and density of *** settling displacements of equal diameter particles increased with increasing their densities,and the settling displacements of equal density particles increased with increasing their diameters.

关键词： Air-solid MSFB Free settling Quasi-zero velocity settling Motion of particles

各因素下气固流态化磁选机的磁选回收特性研究

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煤矿机械 2019年第6期40卷 51-53页

作者：秦兴宗宋树磊骆振福中国矿业大学化工学院江苏徐州221116 中国矿业大学中国矿业大学学报江苏徐州221116

气固流态化磁选机的分选室采用流化床分选槽,磁性颗粒以流态化方式与磁极充分接触,易于被磁极吸引;气流的冲洗作用可以使微细颗粒间的摩擦力和表面黏附力大幅降低,强化磁性颗粒和非磁性颗粒的分离,提高磁选效果,增大磁选机的处理量。该... 详细信息

气固流态化磁选机的分选室采用流化床分选槽,磁性颗粒以流态化方式与磁极充分接触,易于被磁极吸引;气流的冲洗作用可以使微细颗粒间的摩擦力和表面黏附力大幅降低,强化磁性颗粒和非磁性颗粒的分离,提高磁选效果,增大磁选机的处理量。该磁选机分选过程中无需利用水使物料进行分选,在干旱缺水环境下十分有利于资源的节省,而且在后续工序上无需对含水物料进行处理。本实验通过对气固流态化磁选机的加重质回收过程特性的研究,有利于提高磁性介质的回收率,达到降低分选成本、提高资源回收利用的效果,实现经济和环境上的共赢。

关键词：流化床磁选机介质回收净化

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肾结石不同治疗方式的临床效果观察

菏泽医学专科学校学报 2019年第4期31卷 60-61,67页

作者：宋述磊成武县中医医院

目的对比分析输尿管软镜碎石术与经皮肾镜碎石术治疗肾结石的疗效。方法将100例肾结石患者随机分为对照组和观察组,每组50例。观察组采用输尿管软镜碎石术治疗,对照组采用经皮肾镜碎石术治疗,对比分析两组患者的手术时间、术中出血量、... 详细信息

目的对比分析输尿管软镜碎石术与经皮肾镜碎石术治疗肾结石的疗效。方法将100例肾结石患者随机分为对照组和观察组,每组50例。观察组采用输尿管软镜碎石术治疗,对照组采用经皮肾镜碎石术治疗,对比分析两组患者的手术时间、术中出血量、住院时间、结石清除率、并发症情况等。结果两组手术时间、术中出血量、住院时间比较,P均0.05。结论输尿管软镜碎石术手术时间短、术中出血量少、住院治疗时长短、并发症发生率低。

关键词：输尿管软镜经皮肾镜碎石治疗肾结石

Brown Coal Drying Processes-A Review

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Brown Coal Drying Processes-A Review