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Enhancement of heavy metals desorption from the soil by eddy deep leaching in hydrocyclone

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Journal of Environmental Sciences 2024年第1期135卷 242-251页

作者： Ning Wang Hao Lu Bo Liu Tai Xiong Jianping Li Hualin Wang Qiang Yang School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China National Engineering Laboratory for High Concentration Refractory Organic Wastewater Treatment Technology East China University of Science and TechnologyShanghai 200237China

An eddy deep leaching technology was developed in this paper to address the challenge of treating heavy metal contaminants in industrial mining *** desorption effect of As,Cd,Sb and Pb was investigated utilizing chemical leaching and physical eddy *** was found that the heavy metals concentration increased with decreasing particle *** highest proportion of Cd in the form distribution of soil was in the bound to iron and manganese oxides,while the maximum proportion of As,Sb and Pb were in the *** optimal solid-liquid ratio of the hydrocyclone was 1:20,and the corresponding separation efficiency and flow rate were 84.7%and 1.76 m^(3)/hr,*** grade efficiency of soil particle separation increases with particle size and exceeds 99%for particles above 1,000μ*** experiments have revealed that oxalic acid(OA)and a combination of oxalic acid and EDTA(OAPE)were more efficient than citric acid(CA)and a combination of citric acid and EDTA(CAPE)for the desorption of heavy metals,*** comparison of OAPE and eddy leaching found that the latter improved the desorption efficiency by 9.4%,7.5%,7.2%and 7.8%for As,Cd,Sb and Pb compared to the former,*** results demonstrated that the eddy leaching technique could further enhance the desorption efficiency of heavy *** is expected to provide technical support for soil remediation with reduced usage of leaching agents.

关键词： Heavy metals Soil remediation Oxalic acid Eddy leaching hydrocyclone

NUMERICAL AND EXPERIMENTAL STUDY ON LIQUID-SOLID FLOW IN A hydrocyclone

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Journal of Hydrodynamics 2009年第3期21卷 408-414页

作者： WANG Li-yang ZHENG Zhi-chu WU Ying-xiang GUO Jun ZHANG Jun TANG Chi Laboratory of Applied Fluid Dynamics Division of Engineering Sciences Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

hydrocyclones are widely used in industry, of which the geometrical design using CFD techniques is gaining more popularity in recent years. In this study, the Euler-Euler approach and the Reynolds stress model are applied to simulate the liquid-solid flowfield in a hydrocyclone. The methodology is validated by a good agreement between experimental data and numerical results. Within the research range, the simulation indicates that the liquid-solid separation mainly occurs in the conical segment, and increasing conical height or decreasing cylindrical height helps to improve the grade efficiencies of solid particles. Based on these results, two of the same hydrocyclones are designed and installed in series to establish a liquid-solid separation system. Many experiments are then conducted under different conditions, in which the effects of the water cut and the second hydrocyclone on the separation are investigated. The results also confirm that smaller solid particles are more susceptible to the inlet conditions, and the second hydrocyclone plays a more important role as the water cut reduces.

关键词： hydrocyclone liquid-solid flow model efficiency

Development of separation sharpness model for hydrocyclone

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Chinese Journal of Chemical Engineering 2020年第3期28卷 785-792页

作者： Pakpoom Supachart Thanit Swasdisevi Pratarn Wongsarivej Mana Amornkitbamrung Naris Pratinthong Division of Energy Technology School of EnergyEnvironment and MaterialsKing Mongkut's University ofTechnology Thonburi126 Pracha-Uthit RoadBang ModThung khruBangkok 10140Thailand Division ofThermal Technology.School of Energy Environment and MaterialsKing Mongkut's University ofTechnology Thonburi126 Pracha-Uthit RoadBang Mod.Thung khruBangkok 10140Thailand National Nanotechnology Center National Science and Technology Development Agency.111 Thailand Science ParkPhahonyothin RoadKhlong NuengKhlong LuangPathumthani 12120Thailand

hydrocyclones are mechanical devices used in classifying and separating many different types of materials.A classification function of the hydrocyclone has been continually developed for solid–liquid *** the classification process of solids from liquids,it is desirable to reduce the amount of misplaced material;therefore,the separation sharpness,α(alpha),is a parameter that helps in evaluating misplaced material and has been developed as a model to help the designer predict the performance of the ***,the problem with the separation sharpness model is that it cannot be used outside the range of conditions under which it was ***,this research aimed to develop the separation sharpness model to predict more accurately and cover a wide range of conditions using the multiple linear regression *** new regression model of separation sharpness was based on a wide range of both experimental and industrial data-sets of 431 tests collaborating with the additional experiments of 117 tests that were obtained from a total of 548 *** new model of separation sharpness can be used in the range of 30–762 mm hydrocyclone body diameters and feed solid concentrations in the range of 0.5 wt%–80 wt%.When compared with the experimental separation sharpness,the accuracy of the separation sharpness model prediction has an error of 4.53%and^of 0.973.

关键词： Model hydrocyclone Separation Sharpness Slurry Viscosity

NUMERICAL SIMULATION OF TURBULENCE AND ITS STRUCTURE IN A hydrocyclone

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中国有色金属学会会刊：英文版 1999年第1期9卷 130-136,132+134+136+138+页

作者： Chu, Liangyin Chen, Wenmei Li, Xiaozhong Wu, Chigong Sichuan Union Univ Chengdu China

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关键词： hydrocyclone numerical simulation of turbulence turbulence structure

Numerical simulation of strongly swirling turbulent flows in a liquid-liquid hydrocyclone using the Reynolds stress transport equation model

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Science China(Technological Sciences) 2000年第1期43卷 86-96页

作者：陆耀军周力行沈熊 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Engineering Mechanics Tsinghua University Beijing 100084 China

The Reynolds stress transport equation model (DSM) is used to predict the strongly swirling turbulent flows in a liquid-liquid hydrocyclone, and the predictions are compared with LDV measurements . Predictions properly give the flow behavior observed in experiments, such as the Rankine-vortex structure and double peaks near the inlet region in tangential velocity profile, the downward flow near the wall and upward flow near the core in axial velocity profiles. In the inlet or upstream region of the hydrocyclone, the reverse flow near the axis is well predicted, but in the region with smaller cone angle and cylindrical section, there are some discrepancies between the model predictions and the LDV measurements. Predictions show that the pressure is small in the near-axis region and increases to the maximum near the wall. Both predictions and measurements indicate that the turbulence in hydrocy-clones is inhomogeneous and anisotropic.

关键词： strongly swirling flows numerical simulation hydrocyclone

Numerical analysis of hydroabrasion in a hydrocyclone

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Petroleum Science 2016年第2期13卷 304-319页

作者： Mehdi Azimian Hans-Jorg Bart Department of Mechanical and Process Engineering University of Kaiserslautern 67663 Kaiserslautern Germany

The velocity profiles and separation efficiency curves of a hydrocyclone were predicted by an Euler-Euler approach using a computational fluid dynamics tool ANSYS-CFX 14.5. The Euler-Euler approach is capable of considering the particle-particle interactions and is appropriate for highly laden liquid-solid mixtures. Pre- dicted results were compared and validated with experi- mental results and showed a considerably good agreement. An increase in the particle cut size with increasing solid concentration of the inlet mixture flow was observed and discussed. In addition to this, the erosion on hydrocyclone walls constructed from stainless steel 410, eroded by sand particles （mainly SiOz）, was predicted with the Euler-La- grange approach. In this approach, the abrasive solid particles were traced in a Lagrangian reference frame as discrete particles. The increases in the input flow velocity, solid concentration, and the particle size have increased the erosion at the upper part of the cylindrical body of the hydrocyclone, where the tangential inlet flow enters the hydrocyclone. The erosion density in the area between the cylindrical to conical body area, in comparison to other parts of the hydrocyclone, also increased considerably. Moreover, it was observed that an increase in the particle shape factor from 0.1 to 1.0 leads to a decrease of almost 70 % in the average erosion density of the hydrocyclone wall surfaces.

关键词： hydrocyclone Computational fluiddynamicS (CFD) Separation efficiency - Erosion rateErosion impact parameters

Flow field in air-sparged hydrocyclone

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中国有色金属学会会刊：英文版 1994年第3期4卷 30-35页

作者： Chu, Liangyin Luc, Qian Northwestern Univ Shenyung China

ＦＬＯＷＦＩＥＬＤＩＮＡＩＲ－ＳＰＡＲＧＥＤＨＹＤＲＯＣＹＣＬＯＮＥＣｈｕ，Ｌｉａｎｇｙｉｎ；Ｌｕｏ，Ｑｉａｎ（ＭｉｎｅｒａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，Ｐ．Ｏ．Ｂｏｘ１３９ＮｏｒｔｈｅａｓｔｅｒｎＵ... 详细信息

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关键词： air-sparged hydrocyclone flow field froth flotation centrifuge process

Removal of non-point pollutants from bridge runoff by a hydrocyclone using natural water head

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Frontiers of Environmental Science & Engineering 2013年第6期7卷 886-895页

作者： Jianghua YU Yeonseok KIM Youngchul KIM School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Department of Environmental Engineering Hanseo University Seosan 356706 R. O. Korea

A hydrocyclone using natural water head provided by bridge was operated for the treatment of stormwater runoff. The hydrocyclone was automatically controlled using electronic valve which is connected to a pressure meter. Normally the hydrocyclone was open during dry days, but it was closed after the capture of the first flush. The results indicated that the average pressure and the flow rate were directly affected by the rainfall intensity. The pressure head was more than 2 m when the rainfall intensity was above 5mm·h^-1. The percentage volume of underflow with high solids concentration decreased as the pressure and flow rate increased, but the percentage volume of overflow with almost no solids showed the opposite behavior. The total suspended solids （TSS） concentration ratio between the overflow and inflow （TSSover/TSSin） decreased as a function of the operational pressure, while the corresponding ratio of underflow to inflow （TSSunaer/TSSi,） increased. The TSS separation efficiency was evaluated based on a mass balance. It ranged from 25% to 99% with the pressure head ranging from 1.4 to 9.7 m, and it was proportional to pressure and flow rate. Normally, the efficiency was more than 50% when the pressure was higher than 2 m. The analysis of the water budget indicated that around 13% of the total runoff was captured by the hydrocyclone as a first flush, and this runoff was separated as underflow and overflow with the respective percentage volumes of 29% and 71%. The pollutants budget was also examined based on a mass balance. The results showed that the percentage of TSS, chemical oxygen demand （COD）, total nitrogen （TN）, and total phosphorus （TP） in underflow were 73%, 59%, 7.6%, and 49%, respectively. Thus, it can be concluded that the hydrocyclone worked well. It separated the first flush as solids-concentrated underflow and solids-absent overflow, and effectively reduced the runoff volume needing further treatment. Finally, four types of optional post treatme

关键词： first flush hydrocyclone non-point pollution,removal efficiency stormwater runoff

CONTROLLING　OVERGRINDING　OF　VALUABLE　MATERIALS　USING　MODIFIED　AIRSPARGED　hydrocyclone

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中国有色金属学会会刊：英文版 1996年第3期6卷 16-21页

作者： Chu, LY Luo, Q Yu, RH SICHUAN UNION UNIV DEPT CHEM PROC MACHINERYCHENGDU 610065PEOPLES R CHINA NORTHEASTERN UNIV DEPT MINERAL ENGNSHENYANG 110006PEOPLES R CHINA

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关键词： modified air-sparged hydrocyclone grinding-classification overgrinding flotation