Particle Separation Efficiency Research Articles

Investigation of particle capture by grooved plates with elliptic teeth for high intensity magnetic separation

Horizontal ring high intensity magnetic separators adopting grooved plates with right angle teeth present superiority on recovering ultrafine weakly magnetic materials. Being limited by saturation magnetization of magnetic iron yoke, optimizing magnetic field characteristics of grooved plates is a potential way for further improving separation efficiency. In this study, elliptic teeth were designed and optimized for grooved plates in horizontal ring separators. Magnetic field characteristics and particle capture performance of elliptic teeth plates were investigated and compared with conventional plates theoretically and experimentally. Magnetic field force and particle capture cross section area of elliptic teeth plates increased with increasing aspect ratio. Elliptic teeth plates with aspect ratio λ > 1.5 presented larger high magnetic field force region and particle capture cross section area than conventional plates. Particle capture experiments with pure and actual hematite ore indicated that elliptic teeth plates with aspect ratio of 2 and 3 had better particle capture performance and separation efficiency than conventional plates, which was in consistence with theoretical analyses. Elliptic teeth plates presented better magnetic field characteristics and had good application prospect in horizontal ring high intensity magnetic separators.

Study on the effects of a common liquid hopper on the separation efficiency of parallel hydrocyclones

To improve the separation efficiency of parallel hydrocyclones, a new type of common liquid hopper was designed. The separation efficiency of conventional parallel hydrocyclones and those parallel with liquid hoppers were measured experimentally and the influence of common liquid hopper on the flow field analyzed using FLUENT software. The results showed that the efficiency of the parallel hydrocyclones group with liquid hoppers was higher than that of the conventional group, with the maximum efficiency increased by 2.2% and average efficiency increased by 2.1%. The fishhook effect in the efficiency curves was clearly weakened. The separation efficiency of particles between 3 and 10 μm was clearly improved. Compared with the conventional parallel connection, a liquid hopper made the air core in the parallel hydrocyclone group disappear. Meanwhile. the locus of zero vertical velocities was closer to the inside of the hydrocyclone and the free vortex height higher, which make the separation space larger. In addition, parallel vortices in the liquid hopper possessed an inherent self-stability and restricted each other, which caused the swing amplitude of the vortex system center with liquid hopper to be smaller than that of the single vortex center. Therefore, it was demonstrated here that the common liquid hopper improved the separation efficiency of parallel hydrocyclones.

Tunable velocity-based deterministic lateral displacement for efficient separation of particles in various size ranges

Deterministic lateral displacement (DLD) is a promising method showing great potential in achieving high-resolution separation of suspended particles based on their size, through the use of micropillars arranged in a periodic manner. In the traditional approach to DLD, the migration mode of a particle with a specific size is determined by the critical diameter (Dc), which is predetermined by the device's geometry. In contrast to conventional DLD chips that alter the direction of the pillar array to create an angle with the fluid streamlines, this paper proposes a novel approach by changing the direction of the streamlines. The proposed method enables the fabrication of a tunable DLD chip that is simple to produce and can generate a considerable Dc range by adjusting two control parameters. The first parameter is the ratio of velocity between the main outlet and minor outlets, with the main outlet located at the end of the microchannel and the minor outlets situated on the upper side. The second parameter is the flow rate ratio of two sheath inlets that controls particles' entrance position to the DLD chamber. By manipulating these parameters, Dc can be easily adjusted. This chip features completely horizontal rows of pillars that provide Dc values ranging from 1 to 25 μm.

Experimental investigation and structural optimization prediction of a novel carbon stripper for solid-fuel chemical looping combustion

The addition of carbon stripper (CS) can effectively improve the carbon conversion efficiency in the fuel reactor of solid-fuel chemical looping combustion system. An independent CS system is constructed, and the feasibility of the system is verified through feasibility tests and reference work condition tests. The effects of important conditions on the separation performance of CS are also explored based on the experimental platform. It is found that increasing the main gas velocity and cross-flow velocity in the air reactor can effectively improve the directional separation efficiency of binary particles. On the other hand, based on the Computational Fluid Dynamics platform, the important structural factors, including baffle angle, deflector angle and deflector length of the CS, are studied for the directional separation mechanism of binary particles. The results show that a CS structure with the baffle length of 140 mm, the baffle angle of 110°, the deflector length of 40 mm, and the deflector angle of 60° exhibits good directional separation performance. In this case, the separation efficiency of quartz sand is close to 100%, and that of polyvinyl chloride (PVC) particles can reach a high value of 93.7%, demonstrating the high separation efficiency and promising application prospects of this novel CS.

Microfluidic separation of particles by synergistic effect of geometry-induced hydrodynamics and magnetic field

Microfluidic combined with magnetic field have been demonstrated to be the promising solutions for fast and low-damage particles separation. However, the difficulties in the precise layout of magnets and accurate prediction of particle trajectories lead to under and over separation of target particles. A novel particle separation lab-on-chip (LOC) prototype integrated with microstructures and micropolar arrays is designed and characterized. Meanwhile, a numerical model for the separation of magnetic particles by the synergistic effect of geometry-induced hydrodynamics and magnetic field is constructed. The effect of geometry and magnetic field layout on particle deflection is systematically analyzed to implement accurate prediction of particle trajectories. It is found that the separation efficiency of magnetic particles increased from 50.2% to 91.7% and decreased from 88.6% to 85.7% in the range of depth factors from 15 µm to 27 µm and width factors from 30 µm to 60 µm, respectively. In particular, the combined effect of the offset distance of permanent magnets and the distance from the main flow channel exhibits a significant difference from the conventional perception. Finally, the developed LOC prototype was generalized for extension to arbitrary systems. This work provides a new insight and robust method for the microfluidic separation of magnetic particles.

Performance analysis of a gas cyclone with a dustbin inverted hybrid solid cone

This study uses the CFD technique to investigate the influence of a twisted inverted hybrid solid cone (TIHSC) placed at the gas cyclone dustbin on the separator performance. This new design improves the stability and reduces the length of the vortex finder, resulting in a stronger swirl in the cyclone with a higher tangential velocity. The study showed that an increase in the height of the TIHSC increases the maximum tangential velocity up to 2.9 times the inlet velocity. Overall, using TIHSC leads to a significant increase in particle separation efficiency compared to the conventional cyclone. In addition, with an increase in the height of TIHSC, the pressure drop significantly decreases while the separation efficiency increases. For the optimized model, the particle cut size improves from 0.97 to 0.85 µm at 50% separation and from 6.2 to 4.7 µm at 100% separation, while the pressure drop is reduced by 12.7%.Copyright © 2023 American Association for Aerosol Research

Numerical investigation of ternary particle separation in a microchannel with a wall-mounted obstacle using dielectrophoresis

In recent years, microfluidic-based particle/cell manipulation techniques have catalyzed significant advances in several fields of science. As an efficient, precise, and label-free particle/cell manipulation technique, dielectrophoresis (DEP) has recently attracted widespread attention. This paper presents the design and investigation of a straight sheathless 3D microchannel with a wall-mounted trapezoidal obstacle for continuous-flow separation of three different populations of polystyrene (PS) particles (5, 10 and 20 µm) using DEP. An OpenFOAM code is developed to simulate and investigate the movement of particles in the microchannel. Then, the code is validated by performing various experimental tests using a microdevice previously fabricated in our lab. By comparing the numerical simulation results with the experimental tests, it can be claimed that the newly developed solver is highly accurate, and its results agree well with experimental tests. Next, the effect of various operational and geometrical parameters such as obstacle height, applied voltage, electrode pairs angle, and flow rate on the efficient focusing and separation of particles are numerically investigated. The results showed that efficient particle separation could only be achieved for obstacle heights of more than 350 µm. Furthermore, the appropriate voltage range for efficient particle separation is increased by decreasing the electrode angle as well as increasing the flow rate. Moreover, the results showed that by employing the appropriate channel design and operational conditions, at a maximum applied voltage of 10V, a sample flow rate of 2.5μL/min could be processed. The proposed design can be beneficial for integrating with lab-on-a-chip and clinical diagnosis applications due to advantages, such as simple design, no need for sheath flow, the simultaneous ternary separation of particles, and providing precise particle separation.

Numerical Simulation of CO2 Extraction from the Cement Pre-Calciner Kiln System

The cement industry is one of the primary sources producing anthropogenic CO2 emissions. The significant increase in the demand for cement in years has significantly contributed to the increase in carbon emissions. Among numerous CO2 treatment technologies, calcium looping (CaL) is a practical approach to mitigating CO2 emissions. This paper used calcium looping (CaL) to capture CO2 from flue gas in a cement pre-calciner kiln system. The raw material exiting the lowest stage of the preheater is used as a calcium-based adsorbent, and the carbonation reactor is built between the tertiary and secondary preheaters, using the high-temperature flue gas exiting the tertiary preheater to provide heat for the reaction. The CFD (Computational Fluid Dynamics) simulation technology was used to evaluate the rationality of the carbonation reactor and the key factors affecting the carbon removal efficiency of the carbonation reactor. The results indicate that the velocity and pressure fields of the carbonation reactor conform to the general operating rules and are reasonable. The optimal operating speed of particles in the carbonation reactor is 15 m/s, with a separation efficiency of particles of 92.5%, ensuring the smooth discharge of reaction products. The factor analysis of the carbonation reactor shows that when the temperature is 911 K, the mass flow rate of CaO is 2.07 kg/s, and the volume fraction of CO2 is 0.28, the carbonation reaction reaches a chemical equilibrium state, and the carbon removal efficiency is 90%. It should be noted that this carbon removal efficiency is the optimal carbon removal efficiency based on a combination of economic factors. In addition, the influencing factors show a precise sequence: CO2 volume fraction > CaO addition amount > temperature. Finally, we investigated the impact of the addition of the carbonation reactor on the preheater system. The results show that adding the carbonation reactor causes an increase in the flue gas velocity at the outlet of the preheater and a decrease in pressure, reducing the separation efficiency. Although the separation efficiency decreases slightly, the impact on the pre-calciner system is minimal.

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

AbstractImproving the separation efficiency of fine particles becomes more and more critical as environmental pollution aggravates. This study aims to investigate the effects of four key parameters on the performance of gas cyclones, including cyclone body height, particle concentration, initial supersaturation degree, and inlet temperature. Then, the two‐way coupling numerical model, in which is the process of heterogeneous condensation and agglomeration for insoluble fine particles, was achieved by user defined function. On this basis, the response surface analysis method and multi‐objective genetic algorithm were adopted to optimize the cyclone. The results show that when the particle concentration is less than 1000 mg/m3, the separation efficiency can reach above 95%. The initial supersaturation degree has the greatest effect on the separation efficiency and vapour consumption rate, while the cyclone body height is the most critical factor on the pressure drop. As the particle concentration increases, the separation efficiency decreases at first and then keeps almost stable. With the increase of inlet temperature, the separation efficiency is enhanced, and the pressure drop reduces. These research results can provide important guidance for the optimization and engineering application of this technology.

Separation efficiency analysis of multiphase flow inside hydrocyclone using CFD

The study of the separation phenomena inside hydrocyclone often encounters an issue related to particles being misplaced at the outputs since there is a large variety of particle densities. This research presents a numerical study of multiphase flow inside hydrocyclone to analyse the relationship between the separation efficiency of particles and the diameter of the cylindrical section to complete the separation process which greatly affect the overall performance of hydrocyclone. The performance of the hydrocyclone were evaluated using (CFD) method to simulate multiphase flow inside the hydrocyclone. In this study, the Reynolds Stress Model (RMS) is used in the model to simulate the swirling turbulent flow of gas and liquid, and the Volume of Fluid (VoF) Multiphase Model is used to simulate the interface between the liquid and the air core. The solid particle motion is then tracked using the outcomes from the simulation of particle in the The Discrete Element method (DEM) model. Pressure and velocity play important roles in the separation of particles. A centrifugal force that separates particles according to their mass is produced when the hydrocyclone's input is subjected to higher pressure. The fluid's velocity increases as it moves towards the device’s centre, causing the hydrocyclone to rotates and produces a spiral flow pattern. Higher diameter of the cylindrical section, provide higher tangential velocity of particles and their centrifugal forces, resulting in great collection efficiency. In this paper, it has been demonstrated numerically that the performance of hydrocyclone is significantly influenced by the different diameter of the cylindrical section. As of the simulation analysis, increasing the diameter of the cylindrical section has increased the separation efficiency from 34.4% to 44.3% for particle size of 5 μm respectively. Based on the pressure, velocity and streamlines distribution profiles obtained, the results revealed that the tangential velocity contributes largely to the centrifugal forces, resulting in a substantial collection. The increase in diameter increases the residence time of particles inside the hydrocyclone making the swirl rotation of particles more frequent. Thus, it increases the effect of clarity separation and boosts separation accuracy and efficiency.

A Numerical Approach to Characterize the Efficiency of Cyclone Separator

Cyclone separators are active filtering devices suitable for a variety of industrial applications from conventional cutting oil pumps to recycling liquids. Since the vortex flow inside cyclones is highly complicated, the performance and flow patterns of these filters should be thoroughly researched. Liquid–solid cyclones mostly use water. Numerical studies on cyclones using higher-viscosity oils are limited. In this study, a liquid–solid cyclone injected with medium-viscosity cutting oil containing various sized-particles was comprehensively investigated. The reliability of computational fluid dynamics (CFD) methods was verified through a comparison with the experimental results. Three models with different geometries were considered for the analysis. One model was used for CFD verification. The other two models involved adding sockets for hopper length extension and changing the shape of the bottom of the hopper. The models that changed the shape of the hopper, thus directly affecting the cyclone performance, were investigated, and each model was qualitatively compared using a validated method. In addition, particle separation efficiency was evaluated by focusing on the velocity distribution to quantitatively confirm the influence of changing the shape of the hopper. The tangential velocity was determined to be similar across all three models, while the axial velocity was different and the change in the velocity of transport of the particles affected the filter function.

Tailoring the Asymmetric Structure of NH2‐UiO‐66 Metal‐Organic Frameworks for Light‐promoted Selective and Efficient Gold Extraction and Separation

AbstractDesigning adsorption materials with high adsorption capacities and selectivities is highly desirable for precious metal recovery. Desorption performance is also particularly crucial for subsequent precious metal recovery and adsorbent regeneration. Herein, a metal–organic framework (MOF) material (NH2‐UiO‐66) with an asymmetric electronic structure of the central zirconium oxygen cluster has an exceptional gold extraction capacity of 2.04 g g−1under light irradiation. The selectivity of NH2‐UiO‐66 for gold ions is up to 98.8 % in the presence of interfering ions. Interestingly, the gold ions adsorbed on the surface of NH2‐UiO‐66 spontaneously reduce in situ, undergo nucleation and growth and finally achieve the phase separation of high‐purity gold particles from NH2‐UiO‐66. The desorption and separation efficiency of gold particles from the adsorbent surface reaches 89 %. Theoretical calculations indicate that ‐NH2functions as a dual donor of electrons and protons, and the asymmetric structure of NH2‐UiO‐66 leads to energetically advantageous multinuclear gold capture and desorption. This adsorption material can greatly facilitate the recovery of gold from wastewater and can easily realize the recycling of the adsorbent.

Tailoring the Asymmetric Structure of NH2 -UiO-66 Metal-Organic Frameworks for Light-promoted Selective and Efficient Gold Extraction and Separation.

Designing adsorption materials with high adsorption capacities and selectivities is highly desirable for precious metal recovery. Desorption performance is also particularly crucial for subsequent precious metal recovery and adsorbent regeneration. Herein, a metal-organic framework (MOF) material (NH2 -UiO-66) with an asymmetric electronic structure of the central zirconium oxygen cluster has an exceptional gold extraction capacity of 2.04 g g-1 under light irradiation. The selectivity of NH2 -UiO-66 for gold ions is up to 98.8 % in the presence of interfering ions. Interestingly, the gold ions adsorbed on the surface of NH2 -UiO-66 spontaneously reduce in situ, undergo nucleation and growth and finally achieve the phase separation of high-purity gold particles from NH2 -UiO-66. The desorption and separation efficiency of gold particles from the adsorbent surface reaches 89 %. Theoretical calculations indicate that -NH2 functions as a dual donor of electrons and protons, and the asymmetric structure of NH2 -UiO-66 leads to energetically advantageous multinuclear gold capture and desorption. This adsorption material can greatly facilitate the recovery of gold from wastewater and can easily realize the recycling of the adsorbent.

Experimental and numerical investigation on the performance of a gas-solid cyclone with twisted baffles and roughened cone surface

This paper presents a numerical and experimental study of a gas-solid cyclone to improve its performance by employing twisted baffles with a variable pitch length and roughened cone surface. Three-dimensional numerical simulations are performed utilizing ANSYS FLUENT software by employing the Reynolds Stress Model (RSM) and Eulerian-Lagrangian particle tracking scheme for the distribution of particle diameters from 0.1 to 14 μm. Numerical results demonstrate that the baffles have a major effect on the effective parameters of the cyclone such as tangential and axial velocities, turbulence intensity, pressure drop, the three-dimensional structure of eddies, and particle separation efficiency. It is found that the maximum amounts of tangential velocity, axial velocity, and separation efficiency correspond to 3-turn twisted baffles. With the installation of baffles, the generated vortices become stronger, enhancing the turbulence intensity and pressure drop compared to the case without baffles. The results reveal that the presence of baffles results in an enhancement in the separation efficiency of solid particles with a diameter of fewer than 2 μm. For the case of 3-turn twisted baffles and the inlet velocity of 30 m/s, the separation efficiency of particles with a diameter of 0.1 μm is >40%, indicating the proper performance of the device. In the present work, a cyclone with a 3-turn twisted baffle is fabricated and tested. The experimental results confirm the numerical results appropriately and demonstrate that the separation efficiency reaches 80% for the inlet velocity of 5.9 m/s.

RADIOACTIVE AEROSOL SEPARATION CHARACTERISTICS STUDY OF A NOVEL SUBMICRON VIRTUAL IMPACTOR.

With the intention of man-made radioactive aerosol separating and monitoring in a high radon environment, in this paper, a novel submicron virtual impactor was developed, and a numerical simulation model was established. Then, the rationality of the numerical method was validated by comparison to experimental data. Afterward, the variations of separation characteristics under different operating conditions of sample flow rate, minor flow ratio and clean air velocity ratio were discussed and analyzed in detail. In view of the different inertia between man-made and natural radioactive aerosol, the proposed novel submicron virtual impactor could provide a quicker approach to separate and detect the man-made radioactive aerosol particles. After that, the collection nozzle structure of the virtual impactor was improved based on the computational fluid dynamics analysis results. The results show that the proposed impactor has a higher separation efficiency and lower wall loss for fine particles compared to the conventional structures.

Numerical study of particles removal from dusty gas in separation device with straight arc-shaped elements

The paper presents an original design of the separator with straight rows of arc-shaped elements, which allows efficient separation of solid particles without significant abrasive wear of the device’s surfaces. A three-dimensional model of the device is developed, and the principle of its operation is described. In this paper, a numerical study of the capture of solid particles from a gas flow in the separation device is performed. It is found that at a relatively low inlet gas velocity (1 m/s), the separation efficiency of particles with a diameter of 20 to 100 μm is on average 78.9%. An increase in the inlet velocity of the dusty gas flow results in a decrease in the efficiency of the device for particles ranging in size from 25 to 80 μm. The pressure drop of the separator at a velocity of 1 m/s ranges from 45.5 to 95.4 Pa, and at a gas velocity of 4 and 7 m/s – from 740.8 to 4652.1 Pa. An increase in the number of straight arc-shaped elements from 4 to 12 and an increase in particle density from 3400 to 10000 kg/m3 leads to improved separation efficiency.

Effect of arc element row arrangement on separator efficiency

Dust emission gas cleaning is a crucial factor for many industries. The paper proposes a separator with the arc-shaped elements to clean dusty gas from solid particles. The study aims to examine how the distance between rows of arc-shaped elements affects separator efficiency and pressure drop, using numerical methods. In simulations, the inlet velocity of the gas flow varied from 0.5 to 5 m/s and the particle size was 10 to 170 μm. It was found that the change in the distance between the rows of the arc elements in the device leads to the formation of different streams. The results show that increasing the distance between the rows of the arc results in a decrease in the separator efficiency, since the particles during separation from the dusty gas due to centrifugal forces fly into the space between the elements, where they are inversed by the flow again. In this case, the pressure drop decreases. The maximum efficiency of particle separation by the developed device (95.4%) is achieved at a distance between rows of arc elements of 0.75. Pressure loss in the separator ranges from 16 to 1862 Pa at an inlet gas velocity of 0.5 to 5 m/s.

Efficiency of inertial particle separators

An Inertial Particle Separator (IPS) is a non-barrier system installed at the inlet of a gas turbine to mitigate effects of particulate ingestion on the engine. This study presents experimental data for a wide range of flow path designs and test dusts. The experiments were conducted in a bifurcating wind tunnel with a rectangular cross-section and aggressive flow turning, injecting particles with a range of sizes and shapes. A new flow path geometry exhibited higher particle separation efficiency for a variety of test dusts over a range of operating conditions, including off-design cases. The new flow path used a smaller scavenge channel than previous designs in order to reduce flow separation, though not so small as to stop large particles from entering. Data postprocessing highlights the importance of particle Stokes number, scavenge mass flow ratio, and scavenge flow expansion ratio as key parameters in IPS design. • Inertial particle separators (IPS) can prevent sand and dust from entering gas turbines. • A large number of IPS sand ingestion tests have been performed. • Certain geometric parameters of the IPS have a strong effect on sand separation efficiency. • Arizona road dust, AFRL-03, and C-spec test dusts have been used to evaluate IPS designs.

ОЦЕНКА ЭФФЕКТИВНОСТИ СЕПАРАТОРА С СООСНО РАСПОЛОЖЕННЫМИ ТРУБАМИ ПРИОБЕСПЫЛИВАНИИ ГАЗОВЫХ ВЫБРОСОВ ПРИ РАЗЛИЧНОМ УГЛЕ РАСКРЫТИЯ ПРЯМОУГОЛЬНЫХ ЩЕЛЕЙ

An important task in dedusting gas emissions at chemical industry enterprises is to achieve high efficiency. A complex of devices is used for this. Large particles are removed from gases in coarse cleaning devices. Fine particles are removed from gases in fine cleaning devices. However, fine filters are quickly clogged, which leads to an increase in hydraulic resistance and, in some cases, to a decrease in efficiency. An urgent task is to increase their service life and increase efficiency. For this purpose, the paper proposes the design of a separator with coaxially arranged pipes, which is proposed to be installed in front of fine filters. The aim of this work is to numerically investigate the effect of the angle of opening of rectangular slits on the efficiency and hydraulic resistance of a separator with coaxially arranged pipes. The article presents the design of the separator. The principle of operation is described. During numerical calculations, the inlet velocity of the gas flow was set at the inlet of the device, which varied from 3 to 10 m/s, and the mass flow rate of particles was 5 g/s. The particle density varied from 1000 to 3000 kg/m3. The particle diameter varied from 1 to 15 microns. The opening angle of the slits varied from 16 to 24 °. During the calculations, the following main conclusions were made: the structure of vortices in the inter-tube space determines the degree of efficiency of a separator with coaxially arranged pipes, with the angle of opening of rectangular slits α = 20 °, the maximum separation efficiency of fine particles up to 10 microns in size from a dusty stream is equal to an average of 40.3%, the separation efficiency of fine particles from a dusty stream is achieved. the flow rate increases with an increase in the input gas velocity and particle density, because they are easier to dislodge from the swirling gas, the pressure loss in the separator with coaxially arranged pipes is no more than 626 Pa.

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

An eddy deep leaching technology was developed in this paper to address the challenge of treating heavy metal contaminants in industrial mining areas. The desorption effect of As, Cd, Sb and Pb was investigated utilizing chemical leaching and physical eddy techniques. It was found that the heavy metals concentration increased with decreasing particle size. The 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 residual. 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 m3/hr, respectively. The grade efficiency of soil particle separation increases with particle size and exceeds 99% for particles above 1,000 µm. Leaching 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, respectively. The 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, respectively. The results demonstrated that the eddy leaching technique could further enhance the desorption efficiency of heavy metals. It is expected to provide technical support for soil remediation with reduced usage of leaching agents.