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Loose-stratification model in separation process for vanadium pre-concentration from stone coal

Transactions of Nonferrous Metals Society of China 2014年第2期24卷 528-535页

作者：赵云良张一敏包申旭刘涛边颖蒋谋锋刘翔武汉理工大学资源与环境工程学院武汉430070

A technology of one-stage roughing and one-stage scavenging vanadium pre-concentration with shaking table was investigated for improving vanadium grade and decreasing acid consumption minerals content based on the quantitative evaluation of minerals by scanning electronic microscopy （QEMSCAN）. In order to visually illustrate how the vanadium-bearing minerals were separated from system, a loose-stratification model was established with Bagnold shear loose theory and Kelly stratification hypothesis. Through the model, it was inferred that fine fraction and coarse fraction of vanadium-bearing muscovite particles easily became the concentrate in roughing and scavenging stages, respectively. The type of the dominant effect on the loose-stratification was confirmed. In the roughing stage, gravity sedimentation played a leading role in the loose-stratification process. However, in the scavenging stage, shearing dispersion pressure caused by asymmetric motion of table deck took an important part in the loose-stratification process. Finally, the correction of the loose-stratification model was validated by the practical experiment.

关键词： loose-stratification model pre-concentration stone coal separation process

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Three-Dimensional Numerical Investigation of the separation process in a Vortex Tube at Different Operating Conditions

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Journal of Marine Science and Application 2016年第2期15卷 157-165页

作者： Seyed Ehsan Rafiee M.M. Sadeghiazad Department of Mechanical Engineering Urmia University of Technology Urmia P.O. Box 57155-419 Iran

Air separators provide safe, clean, and appropriate air flow to engines and are widely used in vehicles with large engines such as ships and submarines. In this operational study, the separation process in a Ranque-Hilsch vortex tube cleaning （cooling） system is investigated to analyze the impact of the operating gas type on the vortex tube performance; the operating gases used are air, nitrogen, oxygen, carbon dioxide and nitrogen dioxide. The computational fluid dynamic model used is equipped with a three-dimensional structure, and the steady-state condition is applied during computations. The standard k-c turbulence model is employed to resolve nonlinear flow equations, and various key parameters, such as hot and cold exhaust thermal drops, and power separation rates, are described numerically. The results show that nitrogen dioxide creates the greatest separation power out of all gases tested, and the numerical results are validated by good agreement with available experimental data. In addition, a comparison is made between the use of two different boundary conditions, the pressure-far-field and the pressure-outlet, when analyzing complex turbulent flows in the air separators. Results present a comprehensive and practical solution for use in future numerical studies.

关键词： vortex tube air separator separation process operatinggas numerical simulation

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Particle mixing behavior of fine coal in density control of gas-solid separation fluidized bed

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Particuology 2020年第3期18卷 76-87页

作者： Bo Lv Zhenfu Luo Yanhong Fu Bo Zhang Xingzong Qin Xiangnan Zhu College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Key Laboratory of Coal processing and Efficient Utilization of Ministry of Education China University of Mining&TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China

In a gas-solid separation fluidized bed,mixing of fine coal is necessary to achieve a suitable bed density to enable effective separation of low rank *** the basis of a variety of mixture models,a gas-solid separation fluidized bed was judged,where fine coal particles of 0.6-1.0mm were uniformly mixed with magnetite ***-speed dynamic camera technology was combined with a slump-sampling method to study the mixing process of the fine coal in the fluidized *** results showed that limitations of the fluidized bed structure cause the mixing process to be dominated by lateral diffusion and supplemented by axial *** diffusion was mainly achieved through the ascension of bubbles,whereas lateral diffusion was determined by the bursting action of the gas bubbles at the surface of the bed and the undulating characteristics of the *** effective lateral diffusion coefficient increased exponentially with gas velocity but had no strong relationship with the bed *** the feed point moved toward the center,fine coal began to diffuse to both sides,which shortened the time for the bed density stabilization from 20 to 5 *** bed density of the layer was stabilized at approximately 1.75 g/*** separation efficiency of the gas-solid separation fluidized bed containing binary mixtures was more obvious for 6-50 mm raw coal,with a probable error E of 0.16.

关键词： Gas-solid separation fluidized bed Density control Fine coal Diffusion behavior separation process

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Progress in separation processes of Rare Earths

Progress in Separation Processes of Rare Earths

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第四届国际稀土学术会议

作者： Li DeqianLaboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

＜正＞ This paper introduces briefly what our laboratory has been studying on new separation processes of rare earths in recent years, and they include HAB two-solvent extraction for separating yttrium, and extraction separating cerium, thorium and rare earths from Panxi bastnasite. These separation processes are going to industrialize.

关键词： yttrium cerium thorium rare earths two-solvent extraction separation process

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Heat Transfer Investigation and Modeling of Heat Integrated Distillation Column

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China Petroleum processing & Petrochemical Technology 2018年第3期20卷 96-105页

作者： Fang Jing Wang Yijing Su Weiyi Xuan Bihan Li Chunli School of Chemical Engineering Hebei University of Technology

The high degree of reversibility of heat integrated distillation column(HIDiC) has been thermodynamically interpreted by the entropy method. In this paper, a heat transfer model and a more universal method were proposed, through which the overall heat transfer coefficient at different height of column under different operating conditions could be obtained before the experiment. Then the separation of a binary ethanol-water system was carried out experimentally as a case study to verify the heat transfer model and the aforementioned calculation method. The close results between the calculation, the simulation, and the experiments suggested that the proposed model and the calculation method in this paper were accurate and applicable. Meanwhile, it was demonstrated that the HIDiC shows obvious effect of reducing entropy increase and improving thermodynamic efficiency as compared to conventional distillation column.

关键词： heat integrated distillation column heat transfer model separation process

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Oily Water Treatment by Ceramic Membrane: Modeling and Simulation

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Open Journal of Fluid Dynamics 2021年第1期11卷 1-19页

作者： Adriana Barbosa da Costa Pereira Hortência Luma Fernandes Magalhães Leonardo Pereira de Lucena Silva Cristiane Arcoverde Passos Ricardo Soares Gomez Balbina Raquel de Brito Correia Severino Rodrigues de Farias Neto Antonio Gilson Barbosa de Lima Department of Chemical Engineering Federal University of Campina Grande Campina Grande Brazil Department of Industry Federal Institute of Paraiba Cajazeiras Brazil Department of Chemical Engineering Federal University of Paraná Curitiba Brazil Department of Mechanical Engineering Federal University of Campina Grande Campina Grande Brazil

The separation process of oily water using membranes has attracted the attention of researchers and engineers. The greater problem in the use of membrane separation process is the reduction in permeate flux due to clogged pores by oil deposition inside the membrane or by the effect of the concentration polarization. For this purpose, a theoretical study of a water/oil separation module was performed. This device consists of a tubular ceramic membrane provided with a rectangular inlet section. Numerical simulations were performed using Ansys CFX software to solve the mass and momentum conservation equations in the fluid and porous domains. Here was adopted the RNG k-ε turbulence model. The effect of the membrane porosity and the inlet velocity of the fluid mixture on the two-phase flow behavior inside the separation module were evaluated. Results of the volumetric fraction, velocity and pressure fields of the oil and water phases are presented and analyzed. The results indicate a higher oil concentration within the membrane for the cases of higher porosity, and that the inlet fluid mixture velocity does not substantially affect the velocity profile within the separation module. It is found that the maximum separation efficiency of the module was obtained with feed velocity of 40 m/s and membrane porosity of 0.44.

关键词： Ceramic Membranes separation process Computational Fluid Dynamics CFX

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