检索结果-南通市图书馆

Velocity distribution of the flow field in the cyclonic zone of cyclone-static micro-bubble flotation column

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2013年第1期23卷 89-94页

作者： Deng Xiao-wei liu jiong-tian Wang Yong-tian Cao Yi-jun School of Chemical Engineering and Technology China University of Mining & Technology

Laboratory experiments have been conducted to study the flow field in a cyclone static micro-bubble flotation column. The method of Particle Image Velocimetry (PIV) was used. The flow field velocity distribution in both cross section and longitudinal section within cyclonic zone was studied for different circulating volumes. The cross sectional vortex was also analyzed. The results show that in cross section as the circulating volume increases from 0.187 to 0.350 m 3 /h, the flow velocity ranges from 0 to 0.68 m/s. The flow field is mainly a non-vortex potential flow that forms a free vortex without outside energy input. In the cyclonic region the vortex deviates from the center of the flotation column because a single tangential opening introduces circulating fluid into the column. The tangential component of the velocity plays a defining role in the cross section. In the longitudinal section the velocity ranges from 0 to 0.08 m/s. The flow velocity increases as does the circulating volume. Advantageous mineral separation conditions arise from the combined effects of cyclonic flow in cross and longitudinal section.

关键词： Cyclone-static micro-bubble flotation column PIV Cyclonic flow field Velocity distribution

Research on Pressure Drop Performance of the Packing-Flotation Column

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2006年第4期16卷 389-392页

作者： liu jiong-tian ZHANG Min LI Yan-feng LU Yang School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Resource and Civil Engineering Northeastern University Shenyang Liaoning 110004 China

A packing-flotation column was proposed to optimize the flotation environment A research system was es- tablished using a 100 mm diameter cyclonic micro-bubble flotation column to study fluid properties. Dry-plate and wet- plate pressure drops were studied and the corresponding pressure drop equations developed. The results show that the dry-plate pressure drop of the packing cyclonic micro-bubble flotation column is 10–15 times less than that of the chemical tower, which is principally shown in its relatively small resistance coefficient, ξ ≈0.0207. The wet-plate pressure drop is 2–3 times higher than that of the chemical tower, which is largely caused by the separation materials and characteristics of the equipment. With flotation, the greater the pressure drop, the better the flotation environment.

关键词： sieve plate packing flotation column pressure drop

A honeycomb-tube packing medium and its application to column flotation

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2009年第6期19卷 775-778页

作者： ZHANG Min SHI Chang-sheng liu jiong-tian ZHAI Ai-feng School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Environmental Engineering Department North China Institute of Science and Technology Beifing 101601 China

We address problems in the development of large-scale flotation columns that use short cylinders. As a starting point, we investigated the packing medium to identify a highly efficient internal packing for the flotation column. The chosen packing was a honeycomb structure with an aperture diameter of 80 mm, a web thickness of 0.80 mm, a film height of 1000 mm, packed into a 400 mm diameter space, which completely filled the vessel at optimal cost. The column consisted of a modular ring of single-hole hexagonal honeycomb tube packing made from atactic polyproplene (PP-R). The packing was tested in a cyclonic, static micro-bubble flotation column. Computational fluid dynamic modeling was used to analyze the flotation fluid in a honeycomb tube packed flotation column. Our results show that the fluid axial movement was maximized and that the transverse fluid velocities were zero in the vicinity of axial flow. Using the honeycomb tube packing for copper sulfide flotation we observed that the average concentration in the product was increased to 25.41%, from an average feed concentration of 0.729%, with an average recovery of 92.92%. The demands of on-site industrial production were met.

关键词： filling column flotation mineral processing

Separation of Oil from Wastewater by Column Flotation

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2007年第4期17卷 546-551,577页

作者： LI Xiao-bing liu jiong-tian WANG Yong-tian WANG Cun-ying ZHOU Xiao-hua School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Resource and Civil Engineering Northeastern University Shenyang Liaoning 110004 China Xuzhou College of lndustrial Technology Xuzhou Jiangsu 221006 China Department of Mining Engineering University of Kentucky Lexington KY 40506 USA

A new type of device,a dissolved-air flotation column,was developed for separation of oily wastewater. The unique design idea of the dissolved-air flotation column is the combined use of dissolved-air flotation and column flotation. The dissolved air release occurred within the column separation system. As a potential application the column was investigated for its performance in separating emulsified oil droplets in oily wastewater. A high separation efficiency was obtained in a series of tests. The aeration performance of the bubble generator used in the dissolved-air flotation column was also studied in particular.

关键词： oily wastewater separation flotation bubbles generator dissolved-air flotation column

Growth of Nano-Sb_2O_3 on Mica Substrates and Flame Retardant Properties

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2006年第3期16卷 266-269页

作者： FENG Li liu jiong-tian WANG Bing-guo SONG Shuo-jiang School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

In this paper, the Sb2O3 nanoparticles prepared with SbCl3 by the alky hydrolysis, processed with the surfactants, were assembled on mica substrates. The morphology and the assembled behavior of the nano-Sb2O3 on the mica were analyzed by means of TEM. The flame retardant properties of nano-Sb2O3 and Sb2O3/mica complex were studied by combustion test and thermal analysis. The results show that the Sb2O3 nanoparticles are assembled uniformly on the mica substrates. The nano-Sb2O3 was characterized with small size, narrow size distribution, uniform crystal and monodispersed particles. Compared with nano-Sb2O3, the Sb2O3/mica complexes have been achieved the same coordinated effects with Chlorinated Paraffin(CP) and excellent flame retardant properties.

关键词： Sb2O3 nanoparticle mica flame retardant chlorinated-paraffin

Comparative Studies on the Laser Damage Resistance of Ta_(2)O_(5) and Nb_(2)O_(5) Films Performed under Different Electron Beam Currents

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第6期28卷 153-156页

作者： XU Cheng XU Lin-Min ZHANG Han-Zhuo QIANG Ying-Huai ZHU Ya-Bo liu jiong-tian SHAO Jian-Da School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116 School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800

Ta_(2)O_(5) and Nb_(2)O_(5) films are deposited by conventional e−beam method under different electron beam *** optical transmittance,chemical composition,absorption,scattering,surface topography and laser-induced damage threshold(LIDT)of the films are comparatively *** is shown that the increase of electron beam current results in a decrease of the optical transmittance and stoichiometry,whereas it increases the absorption,scattering and rms roughness for both Ta_(2)O_(5) and Nb_(2)O_(5) ***,the LIDT increases first and then decreases with the increase of electron beam *** addition,the annealing improves the optical transmittance,stoichiometry and LIDT for the two kinds of *** the effects of electron beam current and annealing on the LIDT can be mainly attributed to three factors:substoichiometric defects,structural defects and adhesive ***,the comparative results indicate that the laser damage resistance of Ta_(2)O_(5) is lower than that of Nb_(2)O_(5).

关键词： scattering beam annealing

Effect of Oxygen Vacancy on the Band Gap and Nanosecond Laser-Induced Damage Threshold of Ta_(2)O_(5) Films

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第8期29卷 105-109页

作者： XU Cheng YANG Shuai WANG Ji-Fei NIU Ji-Nan MA Hao QIANG Ying-Huai liu jiong-tian LI Da-Wei TAO Chun-Xian School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116 School of Chemical Engineering&Technology China University of Mining and TechnologyXuzhou 221116 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 Shanghai Key Laboratory of Modern Optics System School of Optics-Electrical and Computer EngineeringUniversity of Shanghai for Science and technologyShanghai 200093

Ta_(2)O_(5) films are deposited on fused silica substrates by electron beam evaporation *** optical property,x-ray photoelectron spectroscopy,band gap and nanosecond laser-induced damage threshold(LIDT)of the films before and after annealing are *** is found that the existence of an oxygen vacancy results in the decrease of the transmittance,refractive index,both macroscopic band gap and microscopic band gap,and the LIDT of Ta_(2)O_(5) *** the oxygen vacancy forms,the macroscopic band gap decreases 2%.However,when the oxygen vacancy forms the microscopic band gap decreases 73%for crystalline Ta_(2)O_(5) and 77%for amorphous Ta_(2)O_(5).The serious decrease of microscopic band gap may significantly increase the absorbance of the micro-area in Ta_(2)O_(5) films when irradiated by laser,thus the damage probability *** is consistent with our experimental results that the LIDT of the as-deposited Ta_(2)O_(5) films is 7.3 J/cm^(2),which increases 26%to 9.2 J/cm^(2) when the oxygen vacancy is eliminated after annealing.

关键词： vacancy damage Oxygen

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于原生硬度的煤泥水沉降性能分析

煤炭学报 2014年第4期39卷 757-763页

作者：张志军刘炯天中国矿业大学(北京)化学与环境工程学院北京100083 中国矿业大学化工学院江苏徐州221116

为了寻求煤泥水沉降性能的评价指标,提出了循环煤泥水体系的原生硬度概念。通过对4个典型选煤厂原煤的矿物组成分析及选煤用水和循环水的水质分析表明,循环煤泥水体系的原生硬度由选煤用水的基础硬度和煤中矿物组成共同决定的,并建立了... 详细信息

为了寻求煤泥水沉降性能的评价指标,提出了循环煤泥水体系的原生硬度概念。通过对4个典型选煤厂原煤的矿物组成分析及选煤用水和循环水的水质分析表明,循环煤泥水体系的原生硬度由选煤用水的基础硬度和煤中矿物组成共同决定的,并建立了原生硬度的数学迭代模型,实验室模拟煤泥水循环试验验证了该模型的良好可靠性。通过煤泥水沉降试验可知,当水质硬度小于5 mmol/L时,水质硬度越高,煤泥沉降速度越快,且上清液越澄清。部分选煤厂实例表明,原生硬度低,则煤泥水难处理;原生硬度高,则煤泥水易处理,说明原生硬度是影响煤泥水沉降性能的关键因素。

关键词：煤泥水沉降性能原生硬度水质硬度

在线全文

学校读者我要写书评

暂无评论

微细粒煤间断浓缩沉降试验研究

煤炭学报 2015年第7期40卷 1622-1627页

作者：朱子棋刘炯天桂夏辉中国矿业大学化工学院江苏徐州221116 神华神东煤炭集团有限责任公司陕西榆林719315

为确定微细粒煤泥高效浓缩的最佳操作参数,提出了一种新方法实现煤泥连续浓缩的预测与优化,借助沉降量筒与澄清水质量浓度测量装置确定一定单位面积处理量下煤泥浓缩沉降最佳药剂添加量、入料质量浓度和流量,并预测出该条件下的浓缩效... 详细信息

为确定微细粒煤泥高效浓缩的最佳操作参数,提出了一种新方法实现煤泥连续浓缩的预测与优化,借助沉降量筒与澄清水质量浓度测量装置确定一定单位面积处理量下煤泥浓缩沉降最佳药剂添加量、入料质量浓度和流量,并预测出该条件下的浓缩效率。试验结果表明:随着质量浓度的增大,单位质量最佳药剂消耗量增加,微细颗粒等速沉降速度基本不变,单位面积处理量一定的情况下,压缩区高度降低速度ν基本不变;在20.66 g/(dm2·min)单位面积处理量下,入料质量浓度50 g/L,药剂添加量11 mg/L,入料流量0.083 L/min时,可达到最佳浓缩效率89.05%;随着浓缩时间增加,浓缩效率都不断增加并逐渐达到饱和;当单位处理量小时,低质量浓度浓缩效果较好,但处理量较大时,较高质量浓度较低流量配合更具优势。

关键词：浓缩脱水微细颗粒间断浓缩沉降