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《中国粉体技术》2018年第24卷第5期文章摘要
作者:管理员  来源:本站原创  发布时间:2018年11月6日  点击次数:182

气固两相流中颗粒速度分布函数统计分析

王 婧1 2, 王军武1

1. 中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京 1001902. 中国科学院大学 化学工程学院, 北京 100049

摘要:利用基于连续介质的计算流体力学方法(CFD)和离散单元法(DEM)耦合在一起,建立CFD-DEM耦合方法对粗颗粒流态化过程进行模拟,对气固两相流中的颗粒速度分布函数进行相应的统计分析,并用麦克斯韦分布、指数分布、双峰分布和t分布等对模拟数据进行回归,探讨非均匀气固两相流中合理的速度分布特征。模拟结果表明:麦克斯韦分布不适用于非平衡气固系统中颗粒速度分布函数的描述,t分布或指数分布可以较好地拟合非重力方向的速度分布函数,而双峰分布则能较好地拟合重力方向的颗粒速度分布函数。

关键词:气固两相流; 颗粒速度分布; 动理论; 流态化

中图分类号:TD9   文献标志码:A

文章编号:1008-5548201805-0001-05

 

Statistics of particle velocity distribution function in gas-solid flow

WANG Jing12 WANG Junwu1

 1. State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Science Beijing 100190 China 2. University of Chinese Academy of Science Chemical Engineering Faculty Beijing 100049 China

Abstract The computational fluid dynamics method CFD based on continuum model and the discrete element method DEM were coupled together to establish a CFD-DEM method which was used to simulate the coarse particle fluidization process in this study. The method of statistical analysis was applied to study the particle velocity distribution function and the Maxwellian distribution exponential distribution bimodal distribution and t-distribution were used to regress the simulated data to explore the reasonable velocity distribution characteristics in the non-uniform gas-solid two-phase flow. It is shown that Maxwell distribution cannot be used to describe the particle velocity distribution in the non-equilibrium gas-solid flowt distribution or exponential distribution can fit the velocity distribution in the non-gravitational direction well while bimodal distribution offers a best fitting with the simulation data in the gravitational direction.

Keywords gas-solid flow particle velocity distribution kinetic theory fluidization

 

 

基于离散元法的煤颗粒模型参数优化

李铁军12, 王学文12, 李 博123, 李娟莉124, 杨兆建12

1. 太原理工大学 机械工程学院, 山西 太原 030024 2. 煤矿综采装备山西省重点实验室, 山西 太原 030024 3. 山西煤矿机械制造股份有限公司 博士后科研工作站, 山西 太原 030031 4. 山西焦煤集团有限责任公司 博士后科研工作站, 山西 太原 030022

摘要:为更加真实地模拟煤矿机械和煤散料相互作用,基于离散元法对煤颗粒模型参数进行优化;针对煤颗粒的非规则形状,建立3种颗粒模型;设计一系列实验测定煤颗粒的密度、煤颗粒与耐磨钢板间的恢复系数和静摩擦系数、煤颗粒间的恢复系数;设计响应面仿真试验,建立回归模型并进行优化,以实验获得的煤散料堆积角作为响应值,优化确定煤颗粒间静摩擦系数、滚动摩擦系数以及煤与耐磨板钢间的滚动摩擦系数;最后通过设计的滑板装置将优化参数组合下的仿真与实验结果进行对比验证。结果表明,堆积角数值差异是1.3%,提高了仿真结果的可靠性。

关键词:离散元法; 堆积角; 参数优化; 图像处理; 响应面法

中图分类号:TP391.9 O347.7   文献标志码:A

文章编号:1008-5548201805-0006-0

 

Optimization method for coal particle model parameters based on discrete element method

LI Tiejun12 WANG Xuewen12 LI Bo123LI Juanli124 YANG Zhaojian12

 1. College of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024China 2. Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment Taiyuan 030024China 3. Post-doctoral Scientific Research Station Shanxi Coal Mining Machinery Manufacturing Co. Ltd. Taiyuan 030031China 4. Post-doctoral Scientific Research Station Shanxi Coking Coal Group Co. Ltd. Taiyuan 030022China

Abstract  In order to simulate the interaction more accurately between coal mining machinery and coal bulk materials the parameters of coal particle model were optimized based on discrete element method DEM. Considering the irregular shape of coal particles three kinds of particle models were established. A series of actual tests were carried out to measure the density of coal particle the coefficient of restitution and the coefficient of static friction between coal and wear-resistant steel plate the coefficient of restitution between coal particles. The accumulation angle obtained by actual test was taken as the response value the coefficient of static friction and the coefficient of rolling friction among particles and the rolling friction coefficient between particle and wear-resistant steel plate were determined through the response surface method. Through the skateboard device the optimal parameter combination was validated by comparing the simulation results with actual tests. Results showed that the numerical difference in accumulation angle of actual tests and simulation is 1.3 % which improves the reliability of simulation results.

Keywords discrete element method repose angle parameter optimization image processing response surface method

 

 

纳米磁性流体的制备与应用进展

武 倩1, 张世忠2, 刘慧勇1, 洪若瑜1

(1. 福州大学 石油化工学院, 福建 福州 350002 2. 淮阴工学院 江苏省盐化工新材料工程实验室, 江苏 淮安 223003

摘要:以纳米磁性流体在众多领域的应用潜力为出发点,结合相关研究成果,综述纳米磁性流体的最新研究进展。同时以纳米磁性流体的稳定性、磁性能等为考察的重点,对各种制备方法进行评价与展望。化学共沉淀法因其成本低、操作简单,所得纳米磁性流体稳定性好,是未来研究的重点,但需解决制得的纳米磁性颗粒易团聚的问题。氟醚油基纳米磁性流体与其他油基纳米磁性流体相比,耐高温等性能更优,可以用于苛刻环境下的润滑、密封,将成为纳米流体制备的一个重要研究方向。无毒、单分散、稳定的水基纳米磁性流体因在磁共振造影等生物医学领域具有广泛的应用,而具有可观的发展前景。

关键词:磁性流体; 化学共沉淀法; 氟醚油基; 水基

中图分类号:TB383   文献标志码:A

文章编号:1008-5548201805-0013-07

 

Progress in preparation and application of magnetic fluids

WU Qian1 ZHANG Shizhong2LIU Huiyong1 HONG Ruoyu1

 1. College of Chemical Engineering Fuzhou University Fuzhou 350002 China 2. Huaiyin Institute of Technology Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry Huaian 223003 China

Abstract Based on the application potential of magnetic fluids in many fields and related research results the latest progress of magnetic fluids is reviewed. Meanwhile the stability and magnetism are the focus of investigation and the preparation methods are evaluated and prospected. Because of its low cost simple operation and admirable stability of magnetic fluid chemical  co-precipitation  method  is  the  key point  of future research while it is necessary to overcome the problem that the magnetic particles have the tendency to agglomerate. Compared with other oil-based magnetic fluids fluoroether oil-based magnetic fluids have relatively high-temperature resistance and can be applyied for lubrication and sealing in harsh environments which will become an important research direction. Non-toxic monodisperse and stable water-based magnetic fluids have vital applications in biomedical fields such as magnetic resonance imaging MRI), thereby havig considerable prospects for development.

Keywords magnetic fluid chemical co-precipitation method fluoroether oil-based water-based

 

 

不同三维介孔二氧化硅微球固体酸的合成

裴 阳, 曾丹林, 杨媛媛, 许 可, 吴 洁, 王园园

(武汉科技大学 化学工程与技术学院, 湖北 武汉 430081

摘要:合成了不同三维孔道结构的介孔二氧化硅微球,以其为载体通过浓硫酸磺化法制备了系列磺酸基二氧化硅微球固体酸,并利用扫描电镜、透射电镜和氮气脱附-吸附等手段对其结构进行表征。以乙酸和乙醇的酯化反应为探针,考察磺化温度和时间对不同结构催化剂活性的影响。结果表明,经磺化处理后磺酸基团成功负载到了二氧化硅微球上,且微球的形貌和孔道结构未发生改变。磺化初期,载体的孔道结构是影响催化活性主导因素,孔结构开阔的泡沫状孔道微球固体酸更具优势;随磺化时间的延长,其比表面积大小成为决定催化剂活性的主要因素,比表面积大的蠕虫状孔道微球固体酸催化效果更佳。在240 °C下,磺化6 h制得的蠕虫状孔道微球固体酸负载量达到6.51%,表现出最佳的催化效果。

关键词:介孔二氧化硅; 微球; 固体酸; 孔道结构; 酯化

中图分类号:O643   文献标志码:A

文章编号:1008-5548201805-0020-08

 

Synthesis of mesoporous silica microspheres solid acid with different 3D pore structure

PEI Yang ZENG Danlin YANG YuanyuanXU Ke WU Jie WANG Yuanyuan

 Institute of Chemical Engineering and TechnologyWuhan University of Science and Technology Wuhan430081China

Abstract Mesoporous silica spheres materials with different 3D pore structure and properties were prepared and a series of sulfonate silica microspheres solid acid was synthesized by sulfonated sulfonation method using these mesoporous silica spheres as supports. The physicochemical properties of those catalysts were characterized using scanning electron microscope SEM), transmission electron microscopy TEM), and nitrogen adsorption/desorption. Using the esterification reaction of acetic acid and ethanol as probe the effects of the sulfonated temperature and time on the activity of different structure catalysts were investigated. The results show that the morphology and pore structure of the silica microspheres are not changed after sulfonation. At the beginning of the sulfonation the catalytic performance was governed by the pore structure of the support. Large pore size and open framework made the cellular structure silica microspheresMCF superior to other catalysts. With the extension of sulfonation time the catalytic performance of the catalyst is determined by the surface area and worm-like mesoporous silica spheres solid acid with larger surface area had higher catalytic activities. The worm-like mesoporous silica spheres solid acid synthesized at240 °Cfor 6 h with a load rate of 6.51% shows the best catalytic performance.

Keywords mesoporous silica microsphere solid acid pore structure esterification reaction

 

 

单分散二氧化硅微球的制备及其生长趋势

程 晨, 杜仕国, 鲁彦玲

(陆军工程大学 弹药工程系, 河北 石家庄 050000

摘要:采用溶胶凝胶法一步加料制备了单分散二氧化硅微球。制备过程选用正硅酸乙酯(TEOS)硅源,氨为催化剂,乙醇-水混合溶液为溶剂。固定反应时间,通过激光粒度仪和透射电镜研究多个反应条件对二氧化硅微球粒径和形态的影响;在确定TEOS浓度、水与TEOS物质量比这2个反应条件的基础上,对不同氨浓度下二氧化硅微球的生长趋势进行研究。实验结果表明:当反应时间为5 h时,二氧化硅微球粒径随氨浓度及水与TEOS物质量比的升高而增大,随着TEOS浓度的升高呈先增大后减小的趋势,二氧化硅微球在氨浓度为1.5 mol/LTEOS浓度为0.2 mol/L、水与TEOS物质量比为80:1的实验条件下取得最佳球形度;升高氨浓度可有效缩短二氧化硅微球熟化时间,在氨浓度1.5 mol/L实验条件下,熟化成型时间缩短至2 h;延长反应时间至14 h,在较低氨浓度的实验条件下得到二氧化硅微球的平均粒径为411 nm

关键词:二氧化硅微球; 粒度分布; 颗粒形态; 生长趋势

中图分类号:O635.2   文献标志码:A

文章编号:1008-5548201805-0028-07

 

Synthesis and growth tendency of monodisperse silica microsphere

CHENG Chen DU Shiguo LU Yanling

 Ammunition Engineering Department Army Engineering University Shijiazhuang 050000 China

Abstract One-step feeding method sol-gel method was applied to prepare monodisperse silica microspheres. Dissolving in a mixture of ethyl alcohol tetraethoxysilaneTEOS and ammonia were selected as silicon source and catalyst respectively. Fixing the reaction time laser particle analyzer and transmission electron microscope were employed in finding out the influence of reaction conditions on the particle size and morphology of silica microsphere. On the basis of the optimum concentration TEOS and mass ratio of H2O to TEOS being determined the growth tendency of SiO2 microsphere under different concentrations of ammonium hydroxide was detected. The results indicated that when fixing the reaction time to 5h the particle size of silica microsphere exhibited an uptrend with the increase of concentration of ammonia and mass ratio of H2O to TEOS while with the concentration of TEOS rising the particle size went up first with a declining trend followed the optimum sphericity of silica microspheres was obtained under the experimental conditions of ammonia concentration TEOS concentration and  mass ratio of H2O to TEOS being set as 1.5 mol/L 0.2 mol/L and 80 respectively. The ripening time of silica microsphere was remarkably shortened by ammonia concentration risingthe shortest ripening time could reach to 2 h under the ammonia concentration 1.5 mol/L. Prolonging the reaction time to 14 hthe maximum particle size of microspherei.e. 411nmwas obtained under the low ammonia concentration.

Keywords silicon dioxide microsphere particle size distribution particle morphology growth tendency

 

 

刚玉-尖晶石微粉的低温固相反应法制备及表征

陈彩莲1, 张锦化1, 柯昌明1, 刘学新12, 涂小丹1, 王景然1

1. 武汉科技大学 省部共建耐火材料与冶金国家重点实验室, 湖北 武汉 430081

 2. 湖北斯曼新材料股份有限公司, 湖北 黄冈 438400

摘要:以轻烧氧化镁和工业氧化铝为原料,引入一定量的自制复合铝盐(OKU)作为助剂,研究助剂用量、反应温度对产物物相组成的影响。结果表明:添加助剂和提高反应温度都可以促进MgOAl2O3之间的尖晶石化反应,添加9%(质量分数)助剂的试料在1 200 ℃保温2 h后,MgO完全转变为尖晶石。在实验基础上在梭式窑中进行100 kg级工业生产试验,并对微粉的化学成分、物相组成、粒度分布,及其浆料的流变特性进行了表征。结果表明,制得的刚玉-尖晶石粉由质量分数分别为73%27% 的刚玉和尖晶石组成;原粉和球磨粉的粒度均呈双峰分布,中位径d50分别为9.01.8 μm;由球磨粉制成的水性浆料为假塑性流体,具有剪切变稀现象,并且黏度随固含量的增加而增大。

关键词:固相反应法; 刚玉-尖晶石复合微粉; 物相组成; 粒度分布; 流变特性

中图分类号:TQ175   文献标志码:A

文章编号:1008-5548201805-0035-05

 

Preparation and characterization of corundum-spinel composite powders by low temperature solid state reaction

CHEN Cailian1 ZHANG Jinhua1 KE Changming1LIU Xuexin12 TU Xiaodan1 WANG Jingran1

 1. The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China 2. Hubei Smile New Materials Co. Ltd Huanggang 438400 China

Abstract Corundum-spinel composite powder were synthesized by solid state reaction at relatively low temperature using light-burned magnesia and commercial alumina as raw materials and introducing a novel assistant agent OKU. The effect of amount of assistant agent and fired temperature on the phase composition of the powders was investigated. The laboratory research results show that adding assistant agent and rising calcining temperature can facilitate the spinel synthesizing reaction between MgO and Al2O3. The MgO can be turned into spinel completely with 9 % assistant agent and be calcined at1200 for 2 h. On the basis of laboratory research an industrialized test of100 kggrade spinel synthesizing by solid-phase reaction method with 9 % assistant agent at the temperature of 1200 for 8 h was done. The chemical and phase composition and the particle size distribution of the products were tested. The rheological behavior of the slurry of corundum-spinel powders were also investigated. The industrialized test results indicated that the phase composition of the powder includes spinel 27 % and corundum 73 % without other phase. The medium diameter of the powder is 9.01 μm and it reduced to 1.82 μm after ball milling for 4 h. The particle size distribution of the product and ball-milled powder are both bimodal distributions. The flow ability of the slurry with different solid content obeyes the law of non-Newtonian pseudo-plastic fluid. And their viscosity grows with the increasing solid content.

Keywords solid state reaction corundum-spinel composite powders phase composition particle size distributionrheological property

 

 

多孔纳米羟基磷灰石的制备及药物缓释性能

刘露露, 钱功明, 徐作行

(武汉科技大学 资源与环境工程学院, 湖北 武汉 430081

摘要:用模板法制备三维多孔纳米羟基磷灰石(HAP),考察陈化温度、初始pH等因素对HAP形貌结构及成分的影响;用制备的HAP作为药物载体制备阿莫西林(AM-HAP,考察磷酸盐缓冲溶液(PBS)的pHAM-HAP缓释行为的影响。结果表明,陈化温度低于284.16 K时,生成杂质磷酸钙;陈化温度越高,HAP的粒径越小。pH小于10.2时,有磷酸钙生成,HAP为片状,粒径为334 nm;而pH10.2时,生成纯的HAPHAP为棒状,粒径为134 nmAM-HAP具有很好的缓释性能以及选择性脱附性能,在pH5.7PBS溶液中,缓释前1.5 hAM的脱附率达到48.3%,总脱附率达92.8%

关键词:三维多孔纳米羟磷灰石; 药物载体; 缓释过程; 陈化温度

中图分类号:R962   文献标志码:A

文章编号:1008-5548201805-0040-08

 

Preparation of porous nano-hydroxyapatite and the slow release property of AM-HAP

LIU Lulu QIAN Gongming XU Zuohang

 School of Resource and Environmental Engineering Wuhan University of Science and Technology Wuhan 430081China

Abstract The three-dimensional porous nano-hydroxyapatite was prepared by template method. The effect of aging temperature and the initial pH on the morphology structures and chemical composites of the hydroxyapatite was investigated. The amoxicillin-hydroxyapatite was prepared using the prepared hydroxyapatite as drug carrier. The effect of the pH of PBS liquid on the drug delivery of amoxicillin-hydroxyapatite was investigated. The result indicates that the calcium phosphate is generated when the aging temperature is lower than 284.16 K and the size of hydroxyapatite is decreased with the aging temperature. When the initial pH is lower than 10.2 calcium phosphate is generated the hydroxyapatite is sheet and its size is 334 nm. When the initial pH is 10.2 it is the pure hydroxyapatite the hydroxyapatite is rodlike and the size is 134 nm. The result also indicates that amoxicillin-hydroxyapatite has the good sustained-release performance and selective desorption performance that the desorption efficiency of amoxicillin is 48.3%  in  1.5 h  and  the  total desorption efficiency  is  92.8% in pH 5.7 PBS liquid.

Keywords three-dimensional porous nano-hydroxyapatite drug carrier drug delivery aging temperature

 

 

钛粉尘的最小引燃温度

董海佩1, 程贵海1, 李晓泉1, 徐中慧2, 张勤彬1

1. 广西大学 资源与冶金学院, 广西 南宁 530004; 2. 西南科技大学 环境与资源学院, 四川 绵阳 621010

摘要:利用粉尘云引燃温度装置和粉尘层引燃温度装置, 对5种不同粒径的球形钛粉的最小引燃温度(Tmin)进行试验研究;拟合钛粉尘云最小引燃温度(Tcmin)和粉尘层最小引燃温度(Tlmin)关于粒径的函数, 以及钛粉尘云引燃温度(Tc)关于质量浓度的函数。结果表明:喷尘压力的增大对钛粉尘云引燃温度无明显影响;质量浓度的增大可使钛粉尘云引燃温度以二次函数的形式先减小后增大;粒径的增大使钛粉尘云最小引燃温度以二次函数的形式单调递增且增幅越来越大, 使钛粉尘层最小引燃温度以指数的形式单调递增且增幅越来越小;钛粉粒径相同时, 粉尘云最小引燃温度高于粉尘层最小引燃温度。

关键词:钛粉; 粉尘云; 粉尘层; 引燃温度

中图分类号:X932    文献标志码:A

文章编号:1008-5548201805-0048-05

 

Minimum ignition temperature of titanium powder

DONG Haipei1  CHENG Guihai1  LI Xiaoquan1 XU Zhonghui2   ZHANG Qinbin1

 1.School of Resources and Metallurgy Guangxi University Nanning 530004 China 2.School of Resources and Environmental Southwest University of Science and Technology  Mianyang 621010 China

Abstract The Godbert-Grenwald furnace and minimum ignition temperature of dust layer testing apparatus were used to investigate minimum ignition temperature of dust cloud MITC and minimum ignition temperature of dust layer MITL of the spherical titanium powder with five different particle sizes. The function between MITC-MITL and particle size  and the function between MITC and concentration were fitted. The results showed that the increase of spray pressure has no obvious effect on the ignition temperature of titanium dust cloud  the increase of mass concentration makes MITC decrease firstly and then increase in the form of quadratic function  the increase of particle sizes make MITC increase in the form of quadratic function  and make MITL increase in the form of exponential function  MITC is higher than MITL when the particle sizes is the same.

Keywords titanium powder dust cloud dust layer minimum ignition temperature

 

 

低碳烷烃脱氢制低碳烯烃研究进展

左 成, 吴 曼, 郭庆杰

(青岛科技大学 化工学院, 清洁化工过程山东省高校重点实验室, 山东 青岛 266042

摘要:综述了近年来国内外关于低碳烷烃脱氢制烯烃的相关研究,包括无氧脱氢反应催化剂及其技术、有氧催化剂及其技术;提出了采用化学链技术对低碳烷烃进行脱氢制烯烃的方法,在化学链技术中载氧体作为温和的氧化剂氧化低碳烷烃脱氢制烯烃,可提高低碳烷烃的转化率;指出低碳烷烃脱氢制烯烃的研究重点包括2部分,即载氧体应围绕多组分活性载氧体、耦合催化-氧化复合型载氧体和弱氧化性载氧体等3方面进行研究;关于载氧体和低碳烷烃反应慢的问题,应着重优化反应器的设计思路。

关键词:化学链技术; 低碳烷烃; 低碳烯烃; 载氧体; 反应器

中图分类号:TQ52   文献标志码:A

文章编号:1008-5548201805-0053-08

 

Advance in the dehydrogenation of light alkanes to light olefins

ZUO Cheng WU Man GUO Qingjie

 Key Laboratory of Clean Chemical Processing of Shandong Province School of Chemical Engineering Qingdao University of Science and Technology Qingdao 266042 China

Abstract This paper summarizes the progress of dehydrogenation of light alkanes to light olefins which includs the catalysts and technologies of anaerobic and aerobic dehydrogenation. The chemical looping technology a method of dehydrogenate of light alkanes to light olefins is proposed. In the chemical looping technology the oxygen carriers as mild oxidants were applied to the oxidative dehydrogenation of light carbon alkanes to light olefins which could increase the light alkanes conversion rate of reaction. It is pointed out that the researches on the dehydrogenation of light alkanes to olefins mainly include two sections: The oxygen carrier should be focused on the following three aspects: multiple active oxygen carrier coupled catalytic oxygen carrier oxygen carrier and weak oxidizing oxygen carrier For the bottleneck of slow reaction between oxygen carrier and light alkane the design idea of the reactor should be optimized.

Keywords chemical-looping technology light alkanes light olefins oxygen carrier reactor

 

 

末煤浅槽分选下限多因素分析及试验研究

张立文12, 李国丰1, 周恩会1, 朱广庆1, 张 博13

1. 中国矿业大学 化工学院, 江苏 徐州 221116 2. 神华集团包头能源有限责任公司, 内蒙古 包头 0140303. 北京矿冶研究总院 矿物加工科学与技术国家重点实验室, 北京 102628

摘要:通过理论与试验相结合的方法研究粒径为13~6 mm的末煤浅槽分选中存在的分选效率低,布水板堵塞的难题,得到最佳操作参数。研究结果表明,当悬浮液密度分别为1.41.51.61.7 g/cm3时, 对于粒径为13~6 mm的入料颗粒, 所需的最小上升水流速度为6.3~11.4 cm/s;最佳水平流与上升流流速比值分别为2.0~2.5ρ=1.4 1.5 g/cm3)和1.5~2.0ρ=1.6 1.7 g/cm3);给料位置距布水板高度Hi与液面高度H0的比值为0.7,距给料口长度Li与分选室长度L0的比值为0.1~0.3时,灰分离析度最高;在最优条件下,分选精度分别为0.097 0.071 0.0680.089 g/cm3,精煤灰分分别为8.55%8.87%9.15%9.54%

关键词:重介浅槽; 末煤分选; 上升水流

中图分类号:TD94   文献标志码:A

文章编号:1008-5548201805-0061-05

 

Multiple factors analysis and experimental study on lower limit of slack coal separation by heavy medium vessel

ZHANG Liwen12 LI Guofeng1 ZHOU Enhui1,3ZHU Guangqing1 ZHANG Bo1

 1. School of Chemical and Technology China University of Mining and Technology Xuzhou 221116 China 2. Shenhua Group Baotou Energy Co. LtdBaotou 014030 China; 

3. State Key Laboratory of Mineral Processing Science and Technology Beijing General Research Institute of Mining and Metallurgy Beijing 102628

Abstract The  problem  of  low separation efficiency and blocked water distributor was studied by the combining method of theory and experiment and optimum operating parameters were found. Research shows when the suspension density is 1.4 1.5 1.6 1.7 g/cm3  respectively  for  the 13~6 mm  feeding particles the  required  minimum flow velocity of upward water is 0.63~1.14 cm/s. The  optimal  ratio between horizontal and vertical flowrate is 2.0~2.5(ρ=1.4 or1.5 g/cm3 and 1.5~2.0(ρ=1.6 or1.7 g/cm3); the optimum feeding position is vertical ratio equals 0.7 between height Hi above the water distributor and the suspension height H0and the horizontal ratio belongs 0.1~0.3 of distance Li from the feeding port and length L0 of sorting chamber Under the optimal conditions the Ecart probable moyen is 0.097 0.071 0.068 and0.089 g/cm3 and the ash content is 8.55% 8.87% 9.15% and 9.54% respectively.

Keywords heavy medium vessel slack coal separation rising water

 

 

不同后处理条件对Stöber二氧化硅样品表面基团的影响规律

李姗姗1, 万 泉2, 覃宗华2, 傅宇虹23, 谷渊涛23

(1. 贵州师范大学 化学与材料科学学院, 贵州 贵阳 550001 2. 中国科学院 地球化学研究所; 矿床地球化学国家重点实验室, 贵州 贵阳 550081 3. 中国科学院大学 地球科学学院, 北京 100049

摘要:选择经典的Stöber二氧化硅为代表性样品,采用热红联用技术(TG-DSC-FTIR)分析不同溶剂洗涤(水和乙醇)、不同温度干燥的Stöber二氧化硅样品,探讨表面羟基、乙氧基随后处理条件的变化规律。结果表明:水洗能水解表面的乙氧基而形成羟基,乙醇洗涤通过酯化作用使表面羟基转化为乙氧基;NH3Stöber二氧化硅孔内外乙醇与羟基的酯化过程具有显著的催化作用,NH3存在时在50 ℃较低温度下干燥也能促进乙氧基的形成。

关键词:Stöber二氧化硅; 后处理; 酯化

中图分类号:TB321   文献标志码:A

文章编号:1008-5548201805-0066-06

 

Effect of different post-treatment conditions on surface groups of Stöber silica samples

LI Shanshan1 WAN Quan2 QIN Zonghua2 FU Yuhong23 GU Yuantao23

 1.School of Chemistry and Materials Science Guizhou Normal University Guiyang 550001 China 2. State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China 3. College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing 100049 China

AbstractThe classical Stöber silica was selected as   representative samples which were washed with different solvents water and ethanol), dried at different temperatures and then analyzed systematically by TG-DSC-FTIR. The variation of surface hydroxyl and ethoxyl groups with post-treatments were investigated. The results demonstrate that water washing can hydrolyze ethoxyl groups into hydroxyl groups and ethanol washing can convert surface hydroxyls into ethoxyl groups by esterification. Ammonia can remarkably catalyze the esterification between  ethanol  and  surface  hydroxyls  inside  and  outside  of Stöber silica  pores. Even with the relatively low temperature of50 drying ammonia is still able to promote the formation of ethoxyl groups.

KeywordsStöber silica  post-treatment esterification

 

 

机械湿式球磨法制备鳞片状锌铝合金

丁心雄1, 吴显明12, 陈 上12, 于小林1, 刘立瑶1

(1. 吉首大学 化学化工学院, 湖南 吉首 416000 2. 湘西自治州矿产与新材料技术创新服务中心, 湖南 吉首 416000

摘要:以球形雾化锌铝合金为原料,采用机械湿式球磨法制备出鳞片状锌铝合金;探究球磨时间、球磨机转速和球磨助剂等工艺参数对产品性能的影响;使用扫描电镜(SEM)、X-射线衍射仪(XRD)、红外光谱仪(FTIR)、激光粒度分析仪以及比表面仪对制备的鳞片状锌铝合金的微观形貌、晶体结构、表面吸附助磨剂官能团、粒径大小以及比表面积进行了分析。结果表明,当以球磨时间为9 h、球磨机转速为600 r/min、以含二乙醇胺-马来酸酐共聚物的复合助磨剂为球磨助剂(添加量为原料的2.5%)时,所制备的鳞片状锌铝合金的片状化程度良好,光亮度高,径厚比为36,粒径分布均匀,平均粒径在9 μm左右,能够满足富锌铝涂料要求。

关键词:鳞片状锌铝合金; 机械湿式球磨法; 助磨剂; 二乙醇胺-马来酸酐共聚物

中图分类号:TG179   文献标志码:A

文章编号:1008-5548201805-0072-06

 

Preparation for flake zinc aluminum alloy by mechanical wet ball milling

DING Xinxiong1 WU Xianming12 CHEN Shang12 YU Xiaolin1 LIU Liyao1

 1. College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China 2. Xiangxi Ores Minerals and New Materials Development and Service Center Jishou 416000 China

Abstract Using spherical zinc aluminum alloy powders as raw material flake zinc aluminum alloy powders were prepared by mechanical wet ball milling. The effects of technological parameters such as ball grinding time ball mill speed and ball grinding agents on product performance were investigated. The morphology crystalline structure adsorptive functional groups of grinding agent particle size and specific surface area of flake zinc aluminum alloy were characterized with scanning electron microscopySEM), X-ray diffractionXRD), infrared spectrometerFTIR), laser particle size analyzer and specific surface analyzer. The results show that the ball-milled flake zinc aluminum alloy can be prepared at a rotating speed of 600 r/min milling time of 9 h and using composite grinding agent containing diethanolamine maleic anhydride copolymer as grinding additive with the additive dosage of 2.5%), which exhibits good laminating degree high luminance uniform distribution of particle size its diameter to thickness ratio is 36 and the average particle size is about 9 μm. It can satisfy the requirements for rich zinc aluminum coating.

Keywords flake zinc aluminum alloy mechanical wet ball milling grinding agent diethanolamine maleic anhydride copolymer

 

 

球磨时间对TiO2-V2O5-C还原过程的影响

陈 敏, 肖 玄, 张雪峰

(攀枝花学院 钒钛学院, 四川 攀枝花 617000

摘要:结合SEMTG-DSCX射线衍射和粒度分析测试方法研究球磨时间对TiO2-V2O5-C还原过程的影响。结果表明:随着球磨时间的延长,混合粉料的细颗粒团聚导致其平均粒径略有增加;当球磨时间从8 h延长至16 h,混合粉料在加热过程中的失质量曲线向低温方向偏移,还原过程加快;继续延长球磨时间至24 h,失质量和吸热变化基本一致;当球磨时间为16 h时,混合粉料经逐级脱氧还原和固溶反应合成Ti0.8V0.2C

关键词:球磨; 物相; 还原过程

中图分类号:TF123   文献标志码:A

文章编号:1008-5548201805-0078-04

 

Effects of milling time on reduction process of TiO2-V2O5-C

CHEN Min XIAO Xuan ZHANG Xuefeng

College of Titanium & Vanadium Panzhihua University Panzhihua 617000China

Abstract The effects of milling time on the reduction process of TiO2-V2O5-C mixtures were investigated using SEM TG-DSC X-ray diffraction and particle size analysis. Results show that the mean particle size of milled mixtures increases slightly due to agglomeration with increasing milling time. When the milling time increases from 8 h to 24 h the mass loss curves shift to lower temperatures indicating that the reduction process is accelerated. When the milling time is further increased to 24 h the change of mass loss and endothermic peaks varys little. When the milling time is 16 h deoxidization gradually occurrs and Ti0.8V0.2Cforms.

Keywords milling phase reduction process

 

 

 

 
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