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Journal articles on the topic 'Centrifugal separation'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Bergen, A., P. M. Wild, N. Djilali, and G. W. Vickers. "Fundamental aspects of centrifugal membrane separation." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 215, no. 4 (November 1, 2001): 355–65. http://dx.doi.org/10.1177/095440890121500407.

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A new membrane filtration process which uses the dynamic environment created on board a centrifuge rotor to enhance the performance of the separation process is described. Centrifugal membrane separation (CMS) combines the energy savings associated with centrifugal reverse osmosis (CRO) with the natural alleviation of concentration polarization and fouling due to the dynamic environment. A research centrifuge was constructed to compare the CMS process directly with a conventional process. An experimental investigation was conducted to determine the effects of centripetal and Coriolis acceleration on membrane performance. A description of the apparatus and the experimental results for various membrane orientations are presented. Significant reduction in the fouling rate and virtual elimination of concentration polarization have been shown.

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2

Nikolayev, Vladislav, Marat Akhmetvaliyev, Alexandr Gritsenko, Vladimir Shepelev, and Ildus Gimaltdinov. "Separation of brewer pellets in a vibratory-centrifugal centrifuge." BIO Web of Conferences 27 (2020): 00101. http://dx.doi.org/10.1051/bioconf/20202700101.

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The article reflects the process of dehydration of brewer pellets, as one of the ways to solve the problem of their utilization in order to obtain a highly concentrated feed for farm animals, which is an urgent task. The purpose of the study is to substantiate the interrelation between the technological and physical properties of the brewer pellets during the separation of brewer pellets into dense and liquid fractions in a continuous vibratory-centrifugal centrifuge and its main design and operating parameters. As a result of the research with the analytical method, process and physical properties of brewer pellets are determined when they are interacting with the perforated rotor blades of a vibratory-centrifugal centrifuge. The equations for the yield of the liquid fraction of brewer pellets through the rectilinear and curvilinear rotor blades are obtained, indicating the interrelation between process and physical properties of brewer pellets, which are necessary for determining the rational basic parameters of the proposed vibratory-centrifugal centrifuge.

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3

Борисевич, В. Д., and Е. П. Потанин. "Разделение изотопов кальция в плазменной центрифуге с горячей стенкой." Письма в журнал технической физики 45, no. 1 (2019): 8. http://dx.doi.org/10.21883/pjtf.2019.01.47147.17242.

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AbstractWe propose a method of calcium isotope sepration using a countercurrent plasma centrifuge with a hot wall, which separating the fractions by means of vapor deposition at the end faces of the device. The centrifugal force, providing the effect of radial separation, is excited due to acceleration of a weakly ionized calcium plasma by a rotating magnetic field, while the axial circulating flow, which increases the effect of radial separation, is created by a traveling magnetic field. The capabilities of the method are demonstrated by the example of calculation of the separation factor of the plasma centrifuge as a function of the parameter characterizing the circulation intensity.

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4

Al-Azab, Tariq, Jamil Haddad, and Fadi Alfaqs. "Investigation of the effect of several parameters on the applicability of magnetic separation method." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 4 (2021): 69–73. http://dx.doi.org/10.33271/nvngu/2021-4/069.

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Purpose. This research investigates the separation process performed by a magnetic separator. The magnetic separation process is used to isolate ferrous materials from those which are not. Hence, a prototype of a dry magnetic separator is designed. It should be said that this study defines the effect of different parameters (roll speed, magnetic force, and mass of silica sand particle) on separation efficiency. Methodology. The influence of several parameters of the magnetic separator such as magnetic force, centrifugal force, and properties of particle (mass, shape, etc.) were studied theoretically and simulated by SolidWorks software. The optimum conditions of the magnetic separator were obtained, and several trials were performed to find the point that results in a lower effect of roller speed and a higher effect of the magnetic force on the particle in order to achieve higher separating efficiency. Findings. The results show that the centrifugal force are the most important variable influencing separating efficiency. Moreover, it was found that blade angle magnitude of (174) degree with magnetic force between (1.71E-05 to 6.3E-05 N) and roll speed from (84 to 105 rpm) are the optimum separating conditions to reach higher rate of the separating process. Originality. This is the first time that the effect of the gap distance between the magnet and the feeding particles on the magnetic force has been studied. Furthermore, the effect of centrifugal force on magnetic separator force is investigated theoretically and numerically in order to be compared for different parameters. Practical value. The new prototype design of the magnetic separating unit is promising and efficient since the parameters can be varied based on the type and characteristics of materials. It is also revealed that separating time of the materials is reduced. Hence, this type of construction of a magnetic separator is recommended for industrial applications.

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5

Sulsky, D. "Stability of centrifugal separation." Physics of Fluids 29, no. 5 (1986): 1386. http://dx.doi.org/10.1063/1.865705.

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6

Romaní Fernández, Xiana, and Hermann Nirschl. "A Numerical Study of the Impact of Radial Baffles in Solid Bowl Centrifuges Using Computational Fluid Dynamics." Physical Separation in Science and Engineering 2010 (August 23, 2010): 1–10. http://dx.doi.org/10.1155/2010/510570.

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Centrifugal separation equipment, such as solid bowl centrifuges, is used to carry out an effective separation of fine particles from industrial fluids. Knowledge of the streams and sedimentation behavior inside solid bowl centrifuges is necessary to determine the geometry and the process parameters that lead to an optimal performance. Regarding a given industrial centrifuge geometry, a grid was built to calculate numerically the multiphase flow of water, air, and particles with a computational fluid dynamics (CFD) software. The effect of internal radial baffles on the multiphase flow was investigated. The results show that the baffles are helpful for the acceleration of the fluid, but they disturb the axial boundary layer, making it irregular, and originate a secondary circulating flow which hinders the sedimentation of small particles.

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7

Morozov, Iurii, and Pavel Penkov. "Studying the possibilities of improving centrifugal separation efficiency." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 3 (May 14, 2020): 80–86. http://dx.doi.org/10.21440/0536-1028-2020-3-80-86.

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Object and aim of research. One direction in improving valuable components extraction in centrifugal separation is to apply it in the scheme of circular concentration. By means of multiple passing of a pulp flow through the centrifugal separator, higher indicators of valuable component extraction in heavy residue are ensured. The aim of this research is to study the possibility of improving the efficiency of centrifugal separation based on float circulation. Methodology. Laboratory testing has been carried out to cope with the given task. Centrifugal separation has been fulfilled in a laboratory fortex formation centrifugal separator K-200VL under the cone rotation 86 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 3. 2020 ISSN 0536-1028 frequency of 1000 r/min. Hydrocycloning has been carried out in cyclone separator GTs-75 with the apex diameter of 1.7 cm. The obtained concentrate and tailings were subject to gold assay test. According to the results of the assay test, the calculation of gold extraction in heavy residue and float has been fulfilled. Summary. The obtained result testifies to high efficiency of the proposed technical solution. The proposed technical solution ensures improved efficiency of the process by means of increasing the extraction of particles of increased density in the concentrate when increasing its quality and reducing specific water consumption for the process

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8

Sonmez, Cigdem, Alper Gümüş, Mehmet Senes, Guzin Aykal, Fatma Taneli, Fehime Aksungar, Esin Avci, et al. "An important source of preanalytical error in medical laboratories: centrifugation." Turkish Journal of Biochemistry 46, no. 4 (February 24, 2021): 399–405. http://dx.doi.org/10.1515/tjb-2020-0262.

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Abstract Centrifugation separates particles within the specimen according to their shape, dimensions, and density and basically can be defined as a separation method. The centrifuge is an essential device in medical laboratories to prepare the serum, plasma, and urine samples for analysis. It is basically an electric device composed of the stationary (motor) and the motile (rotor) part. The centrifugation depends on two main variables: relative centrifugal force (RCF) and centrifugation time. The physical impact separating the specimen into its components in the centrifuge known as RCF is expressed as the multiples of gravitational acceleration (×g). RPM, defined as the number of rotations of the centrifuge per minute, shows the speed of the centrifuge. RCF value can be calculated by using RPM, and the centrifuge radius. Because models and sizes of centrifuges vary considerably, the use of gravity (g) forces instead of RPM is suggested. The centrifuges can be classified according to their usage, speed, technical specifications, and rotor type. An accurate and precise centrifugation process is essential to prevent errors in the preanalytical phase. The purpose of this document is to ensure the standardization of a good, precise protocol for the centrifugation process among the medical laboratories.

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9

Iurii, Morozov, Penkov Pavel, and Dmitriev Vladimir. "Investigating the method of improving technological parameters of centrifugal separation with pneumatic turbulization." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 4 (June 25, 2020): 62–69. http://dx.doi.org/10.21440/0536-1028-2020-4-62-69.

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Research aim and subject. In the last few decades centrifugal separators have been widely used to extract gold. Large water consumption essential in the course of operation is the basic drawback of the method, which in its turn results in increased capital and operational expenditure. As soon as water is becoming increasingly more important resource, the study of centrifugal separation with air turbulization is of great practical significance. The aim of the present research is to study the method of improving technological parameters of centrifugal separation with the use of circulation concentration. Methodology. The proposed method of centrifugal separation has been realized in laboratory conditions at artificial quartz with grain size range of 0.1…+0.01 mm and tungsten powder with grain size range of 0.023…+0.02. Centrifugal separation has been carried out in a laboratory turbulization separator K-200VL equipped with a pneumatic mixing baffle for near-wall layer turbulization with compressed air streams delivered from inside the cone. On completion of each test, concentrate and tailings output has been determined as well as the mass fraction of tungsten within them; tungsten extraction to concentrate has been calculated. Summary. The obtained data prove high effectiveness of centrifugal separation in the mode of light fraction circulation. Centrifugal separation with the use of circulation concentration makes it possible to increase extraction of high-density particles to heavy fraction and increase the quality of heavy fraction, while the use of pneumatic turbulization leads to specific water consumption reduction.

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10

Schaflinger, Uwe. "Centrifugal separation of a mixture." Fluid Dynamics Research 6, no. 5-6 (December 1990): 213–49. http://dx.doi.org/10.1016/0169-5983(90)90014-p.

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11

Sister, V. G. "Hydrodynamics of centrifugal separation devices." Chemical and Petroleum Engineering 29, no. 1 (January 1993): 16–19. http://dx.doi.org/10.1007/bf01149389.

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12

Chen, Lu Zheng, Guo Dong Xu, Jian Xiong Huang, and Shu Ming Wen. "Centrifugal High Gradient Magnetic Separation of Fine Ilmenite." Advanced Materials Research 634-638 (January 2013): 3304–7. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3304.

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Centrifugal High Gradient Magnetic Separation (CHGMS) was creatively developed, and in the present investigation was used for the concentration of fine ilmenite from tailings through a cyclic pilot-scale CHGMS separator, to study the effect of two key parameters, i.e., magnetic induction and rotation speed of matrix, on the separation performance of the separator. The results of investigation indicates that the CHGMS is effective in concentrating the ilmenite; an increase in the rotation speed increases concentrate grade but reduces recovery of TiO2, and this is reverse for the induction. While the two parameters were optimized, a concentrate assaying 19.42% TiO2 with 80.72% recovery of TiO2 is achievable from the tailings assaying 8.18% TiO2. It was concluded that the CHGMS provides a prospective technology for the concentration of fine ilmenite.

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13

Xiong, Tao, Xiangjun Ren, Meifang Xie, Yuhuan Rao, Yongjun Peng, and Luzheng Chen. "Recovery of Ultra-Fine Tungsten and Tin from Slimes Using Large-Scale SLon-2400 Centrifugal Separator." Minerals 10, no. 8 (August 5, 2020): 694. http://dx.doi.org/10.3390/min10080694.

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China is very rich in tungsten and tin resources, but most of them are finely disseminated with gangues, and thus, fine grinding is required for effective separation, which results in the abundant production of ultra-fine tungsten and tin values into slimes and tailings. The SLon centrifugal separator is highly effective in recovering ultra-fine heavy particles, because it operates on the centrifugal acceleration of particles in the flowing film of a few millimeters thick. The recovery of ultra-fine tungsten minerals from a slime assaying 0.22% WO3, in which 81.85% distributed in −40 µm fraction, was investigated using large-scale SLon-2400 centrifugal separator. Under optimized operating conditions, it produced a primary tungsten concentrate assaying 1.65% WO3 at a high recovery of 77.83%. Moreover, it produced a primary tin concentrate assaying 1.56% Sn at a high recovery of 79.85% from a tin slime assaying 0.27% Sn, in which 74.78% Sn was distributed in −40 µm fraction; then, followed by the flotation cleaning process, a final tin concentrate assaying 16.23% Sn with 66.7% recovery was produced. It was particularly noted that in this large-scale centrifugal separator, the three-conical separation drum stuck with abrasion-resistant ceramic slices on its inner surface played a key role for achieving high constant separation performance. It was concluded that the SLon centrifugal separator has important application prospects for high-efficient recovery of ultra-fine heavy minerals from slimes and tailings.

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14

Penkov, Pavel, and Yuri Morozov. "Separation of minerals in a centrifugal field using circulating concentration." E3S Web of Conferences 177 (2020): 01005. http://dx.doi.org/10.1051/e3sconf/202017701005.

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Due to the high speed of rotation of the centrifugal separator cone, it is possible to separate particles of small sizes. In its turn, the high speed of rotation of the centrifugal separator cone leads to clogging of the grooves of the separator cone with solid particles. The increased pressure of the turbulizing agent contributes to the loosening of solid particles in the grooves of the centrifugal separator cone, but can wash out particles with increased density from the grooves. Also, the loss of a valuable component is associated with the fact that particles of a valuable component located on the surface of the near-wall layer do not have time to get into the grooves in one cycle and are washed out of the separator cone together with the light fraction. In this regard, there is a need to study the increase in centrifugal separation using it in the circulating concentration scheme. Experiments were carried out in laboratory conditions on an artificial mixture of tungsten and quartz. The results of the experiments show an increase in enrichment rates.

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15

Kharkov, Nikita, Olga Ermak, and Olesya Aver’yanova. "Numerical Simulation of the Centrifugal Separator for Oil-Water Emulsion." Advanced Materials Research 945-949 (June 2014): 944–50. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.944.

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Calculation of a centrifugal water oil separator is shown. The separator represents alternative method of purifying water of oil inclusions and sludge (at a concentration up to 12%). The problems of creating a computational mesh, defining boundary conditions, separation two phases of oil-water emulsion and efficiency of separation are considered.

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16

Zhao, Zhi Guo, and Wen Ming Yu. "Numerical Simulation of Internal Flow Field on Diesel Centrifugal Gas-Oil Separator Based on CFD." Applied Mechanics and Materials 373-375 (August 2013): 409–12. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.409.

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Aiming at the low efficiency problem of the traditional gas-oil separator, this paper put forward a centrifugal gas-oil separator. In order to identify out the interior fluid field character of centrifugal gas-oil separator, RANS equation, RNG k-ε model and discrete phase model was applied to simulate the interior fluid field character and separation efficiency of centrifugal gas-oil separator. The simulation results showed that the flow field in the disc clearance was mainly laminar flow, and the flow field at the import and export of the disc was turbulence. Meanwhile, the velocity and pressure of the interior fluid field were equably distributed, the velocity and pressure in the disc clearance fluctuate in a tight range along vertical direction, and decrease along horizontal direction, and the particles in the disc clearance were distributed uniformly. The separation efficiency was 96.6% and the results met the design requirements.

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17

Kim, Moonjeong, Jemyung Cha, and Jeung Sang Go. "Ring-Shaped Baffle Effect on Separation Performance of Lithium Carbonate Micro Particles in a Centrifugal Classifier." Micromachines 11, no. 11 (October 30, 2020): 980. http://dx.doi.org/10.3390/mi11110980.

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In this work, a centrifugal classifier for separating lithium carbonate particles, used as a cathode material for lithium-ion batteries, was investigated. This work numerically evaluates the internal flow and particle separation performance of the centrifugal classifier. The complex turbulent flow field in the classifier is key to understanding particle motion. A Reynolds stress model, to describe air flow field, and a discrete phase model, to track particle motion, were applied to a numerical simulation. Design parameters such as mass flow rate and rotor speed were investigated, and a ring-shaped baffle, in particular, was designed to investigate the effects of flow and particle separation in the centrifugal classifier. The simple geometry of the baffle changes the movement direction of unseparated particles to the rotor cage region, and increases the local air velocity in the separation zone. The numerical analysis results were verified through a baffle experiment.

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18

YU, Ping. "Velocity Simulation Analysis on Centrifugal Separation Field of Horizontal Spiral Centrifuge." Journal of Mechanical Engineering 47, no. 24 (2011): 151. http://dx.doi.org/10.3901/jme.2011.24.151.

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19

Zhang, Lei, and Hui Ling Liu. "The Tank Bottom Oily Sludge Characteristics Studying and Treating Processing Researching." Advanced Materials Research 742 (August 2013): 262–67. http://dx.doi.org/10.4028/www.scientific.net/amr.742.262.

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The sediments in all kinds of containers in oily field ground processing system were called tank bottom oily sludge. In this paper, the characteristics of sludge were studied. The colloid and asphaltene can increase strength of the oily-water emulsion film which can lead to seriously oily emulsion. In view of this, the process of conditioning-ultrasonic demulsification-centrifugal separation treating tank bottom oily sludge was designed by studying the sludges physical and chemical characteristics. The process parameters were selected. The conditioning were that the dose of detergent was 600 ~ 800 mg/L; The ultrasound processing was that the temperature was 60°C, the ultrasound power was 12Kw and the running time was 25min; The centrifugal separation was that the temperature was 60°C, the dosing flocculant was 600mg/L and centrifuge rotating was 2200r/min. The oily containing in the sludge of centrifugal exports was less than 2% by using this process at the optimal parameters.

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20

Li, Tong, Jing Tao Wei, and Ji Li. "Mechanical Model of Non-Magnetic Particles Centrifugal Separation in Magnetic Fluid." Advanced Materials Research 820 (September 2013): 225–28. http://dx.doi.org/10.4028/www.scientific.net/amr.820.225.

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It is difficult to sort fine non-magnetic particles only by the buoyancy of magnetic fluid. Therefore, based on the magneto hydrostatic separation, the centrifugal separation under the condition of centrifugal force would be an effective method to improve the efficiency. By establishing the mechanical model of centrifugal separation in magnetic fluid, this paper analyzes the kinematical equations of non-magnetic particles in three directionstangential direction, radial direction, and axial direction, and then theoretically explores the separation mechanism of this method.

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21

Fyles, T. M., and D. S. Lycon. "Fouling reduction using centrifugal membrane separation." Journal of Membrane Science 176, no. 2 (August 2000): 267–76. http://dx.doi.org/10.1016/s0376-7388(00)00472-5.

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22

Greenspan, H. P., and M. Ungarish. "On the enhancement of centrifugal separation." Journal of Fluid Mechanics 157 (August 1985): 359–73. http://dx.doi.org/10.1017/s0022112085002415.

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We consider the two-phase flow of a suspension in a rotating cylinder with inclined endplates for which inertial and viscous effects are small. It is shown that, when the Coriolis force is dominant, flow in the core is essentially unaffected by geometry. If a fluid particle can make a complete circuit about the rotation axis, the sedimentation velocity cannot be augmented by geometrical effects as it can in gravitational settling. However, with the insertion of a complete meridional barrier to block movement around the centre, separation becomes more sensitive to the shape of the container walls. In this case, behaviour similar to that in a gravitational field is possible once again.

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23

Bergen, A., P. M. Wild, N. Djilali, and G. W. Vickers. "Fundamental aspects of centrifugal membrane separation." Proceedings of the I MECH E Part E Journal of Process Mechanical Engineerin 215, no. 4 (November 1, 2001): 355–65. http://dx.doi.org/10.1243/0954408011530541.

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24

Lepekhin, V. M., V. L. Borzov, and V. N. Yaramenko. "The Centrifugal Separation of Fine Minerals." Magnetic and Electrical Separation 6, no. 4 (1995): 235–42. http://dx.doi.org/10.1155/1995/56891.

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25

Fagan, Jeffrey A., Matthew L. Becker, Jaehun Chun, Pingting Nie, Barry J. Bauer, Jeffrey R. Simpson, Angela Hight-Walker, and Erik K. Hobbie. "Centrifugal Length Separation of Carbon Nanotubes." Langmuir 24, no. 24 (December 16, 2008): 13880–89. http://dx.doi.org/10.1021/la801388a.

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26

Gulamovich, Bayboboev Nabijon. "Creation of the Construction of the Digger-Loader with a Centrifugal Separation." International Journal of Psychosocial Rehabilitation 24, no. 4 (April 30, 2020): 6790–94. http://dx.doi.org/10.37200/ijpr/v24i4/pr2020490.

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27

Górka, Andrzej. "Fractionation of biological micro-particles in the field of gravity and the field of centrifugal forces." Bulletin of the Military University of Technology 68, no. 1 (March 29, 2019): 153–64. http://dx.doi.org/10.5604/01.3001.0013.1477.

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The paper presents the basic relationships describing the state of boundary equilibrium of fractions isolated in the process of fractionation of binary biological mixtures formed on the warp of homogeneous base solution in the gravitation field and in the vortex reference system. The state of boundary equilibrium of fractions is described by equations of the mass equilibrium, gravity forces, centrifugal forces and buoyancy forces related to particular fractions and the whole mixture of microparticles. It describes the final stage of fractionation of the microparticles, in which the microparticles in the mixture no longer emigrate. In the analysis we used an example of fractional distribution created in the blood fractionation process and the examples of calculations presented in the article, which refer to this distribution. The calculations showed that fractionation in the field of centrifugal force forms fractions with increased density of selected groups of cells of similar specific masses. Keywords: fractionation of mixtures, sedimentation of mixtures, separation of blood components in the gravity field, separation of blood components in the field of centrifugal force, blood centrifugation, medical centrifuges, homogeneous biological mixtures, heterogeneous biological mixtures, centrifugal force field.

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Winkler, Marvin, Marco Gleiss, and Hermann Nirschl. "Soft Sensor Development for Real-Time Process Monitoring of Multidimensional Fractionation in Tubular Centrifuges." Nanomaterials 11, no. 5 (April 25, 2021): 1114. http://dx.doi.org/10.3390/nano11051114.

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High centrifugal acceleration and throughput rates of tubular centrifuges enable the solid–liquid size separation and fractionation of nanoparticles on a bench scale. Nowadays, advantageous product properties are defined by precise specifications regarding particle size and material composition. Hence, there is a demand for innovative and efficient downstream processing of complex particle suspensions. With this type of centrifuge working in a semi-continuous mode, an online observation of the separation quality is needed for optimization purposes. To analyze the composition of fines downstream of the centrifuge, a UV/vis soft sensor is developed to monitor the sorting of polymer and metal oxide nanoparticles by their size and density. By spectroscopic multi-component analysis, a measured UV/vis signal is translated into a model based prediction of the relative solids volume fraction of the fines. High signal stability and an adaptive but mandatory calibration routine enable the presented setup to accurately predict the product’s composition at variable operating conditions. It is outlined how this software-based UV/vis sensor can be utilized effectively for challenging real-time process analytics in multi-component suspension processing. The setup provides insight into the underlying process dynamics and assists in optimizing the outcome of separation tasks on the nanoscale.

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Endre, Gábor, Zsófia Hegedüs, Adiyadolgor Turbat, Biljana Škrbić, Csaba Vágvölgyi, and András Szekeres. "Separation and Purification of Aflatoxins by Centrifugal Partition Chromatography." Toxins 11, no. 6 (May 30, 2019): 309. http://dx.doi.org/10.3390/toxins11060309.

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Aflatoxins are mycotoxins that are produced by several species of filamentous fungi. In the European Union, the concentration limits for this group of mycotoxins in food and feed products are very low (on the order of parts per billion). Thus, relatively high amounts of these substances in their pure forms are required as reference standards. Chromatographic techniques based on solid stationary phases are generally used to purify these molecules; however, liquid–liquid chromatographic separations may be a promising alternative. Therefore, this study proposes a liquid–liquid chromatographic method for the separation of four aflatoxins and impurities. To optimise the method, numerous biphasic solvent systems (chloroform-, acetone- and acetic acid-based systems) were tested and evaluated in terms of their effectiveness at partitioning aflatoxins; the toluene/acetic acid/water (30:24:50, v/v/v/%) system was found to be the most efficient for application in centrifugal partition chromatographic instrument. Using liquid–liquid instrumental separation, the four aflatoxins, namely B1 (400 mg), B2 (34 mg), G1 (817 mg) and G2 (100 mg), were successfully isolated with 96.3%–98.2% purity from 4.5 L of Aspergillus parasiticus fermented material in a 250 mL centrifugal partition chromatography column. The identities and purities of the purified components were confirmed, and the performance parameters of each separation step and the whole procedure was determined. The developed method could be effectively used to purify aflatoxins for analytical applications.

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30

Hirata, Naoya, and Koichi Anzai. "Numerical Analysis of Centrifugal Separation Behavior during Centrifugal Casting Using Particle Method." Tetsu-to-Hagane 103, no. 12 (2017): 771–79. http://dx.doi.org/10.2355/tetsutohagane.tetsu-2017-065.

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31

Berthod, Alain, Tatyana Maryutina, Boris Spivakov, Oleg Shpigun, and Ian A. Sutherland. "Countercurrent chromatography in analytical chemistry (IUPAC Technical Report)." Pure and Applied Chemistry 81, no. 2 (January 1, 2009): 355–87. http://dx.doi.org/10.1351/pac-rep-08-06-05.

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Countercurrent chromatography (CCC) is a generic term covering all forms of liquid-liquid chromatography that use a support-free liquid stationary phase held in place by a simple centrifugal or complex centrifugal force field. Biphasic liquid systems are used with one liquid phase being the stationary phase and the other being the mobile phase. Although initiated almost 30 years ago, CCC lacked reliable columns. This is changing now, and the newly designed centrifuges appearing on the market make excellent CCC columns. This review focuses on the advantages of a liquid stationary phase and addresses the chromatographic theory of CCC. The main difference with classical liquid chromatography (LC) is the variable volume of the stationary phase. There are mainly two different ways to obtain a liquid stationary phase using centrifugal forces, the hydrostatic way and the hydrodynamic way. These two kinds of CCC columns are described and compared. The reported applications of CCC in analytical chemistry and comparison with other separation and enrichment methods show that the technique can be successfully used in the analysis of plants and other natural products, for the separation of biochemicals and pharmaceuticals, for the separation of alkaloids from medical herbs, in food analysis, etc. On the basis of the studies of the last two decades, recommendations are also given for the application of CCC in trace inorganic analysis and in radioanalytical chemistry.

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32

Birmingham, D. P., and W. H. Hall. "Efficiency Comparisons for a Centrifugal Separator Using Hydrocarbon Fluids and Steam and Water." Journal of Energy Resources Technology 121, no. 2 (June 1, 1999): 117–21. http://dx.doi.org/10.1115/1.2795066.

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During 1996 and 1997, a steam and water separator used in the nuclear power industry was tested with hydrocarbon fluids to evaluate its potential for use in the hydrocarbon production industry. Prior to testing with hydrocarbon fluids, a nondimensional parameter was developed from a simple model of the second-stage centrifugal separator to correlate existing liquid separation efficiency data for this separator using steam and water. This paper outlines the development of the nondimensional correlating parameter and presents comparisons of liquid separation efficiency with steam and water and hydrocarbon fluids using this parameter.

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Zhou, Jian Hua, Li Guo Liu, and Xue Ming He. "Numerical Simulation and Process Analysis for Injection Forming about the Thin-Wall Conical Centrifugal Disc." Advanced Materials Research 941-944 (June 2014): 2298–304. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2298.

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A numerical simulation mathematical model and sloved method about injection forming for thin-wall part was established. Based on it, Simulation of the injection forming process of centrifugal separation disc. Through the simulation of forming process for PA66 and PA66+30%GF two kinds of materials, realized the injection forming for centrifugal separation disc using PA66+30%GF. Through the anisotropy of glass fiber orientation, improve the stiffness and toughness for centrifugal disc.

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Golombok, Michael, and Les Chewter. "Centrifugal Separation for Cleaning Well Gas Streams." Industrial & Engineering Chemistry Research 43, no. 7 (March 2004): 1734–39. http://dx.doi.org/10.1021/ie030691i.

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Chen, Luzheng, Jianwu Zeng, Changping Guan, Huifen Zhang, and Ruoyu Yang. "High gradient magnetic separation in centrifugal field." Minerals Engineering 78 (July 2015): 122–27. http://dx.doi.org/10.1016/j.mineng.2015.04.018.

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Wang, Xuesong, Nick J. Miles, and Sam Kingman. "Numerical study of centrifugal fluidized bed separation." Minerals Engineering 19, no. 10 (August 2006): 1109–14. http://dx.doi.org/10.1016/j.mineng.2006.03.011.

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Cracknell, Roger, and Michael Golombok. "Monte-Carlo Simulations of Centrifugal Gas Separation." Molecular Simulation 30, no. 8 (July 15, 2004): 501–6. http://dx.doi.org/10.1080/08927020410001715364.

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Lutz, M. P., G. Gaedicke, and W. Hartmann. "Large-scale cell separation by centrifugal elutriation." Analytical Biochemistry 200, no. 2 (February 1992): 376–80. http://dx.doi.org/10.1016/0003-2697(92)90482-m.

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van Wissen, Ralph, J. J. H. Brouwers, and Michael Golombok. "In-line centrifugal separation of dispersed phases." AIChE Journal 53, no. 2 (2007): 374–80. http://dx.doi.org/10.1002/aic.11074.

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Maj, G., M. Laurent, M. Mastrangeli, and Y. Lecoffre. "TURBYLEC: DEVELOPMENT AND EXPERIMENTAL VALIDATION OF AN INNOVATIVE CENTRIFUGAL OIL – WATER SEPARATOR." International Oil Spill Conference Proceedings 2014, no. 1 (May 1, 2014): 634–48. http://dx.doi.org/10.7901/2169-3358-2014.1.634.

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ABSTRACT An innovative oil/water separator (TURBYLEC) has been developed in the frame of the HOVERSPILLTM European project (Fast Air Cushion platform for Oil Spill Remediation), partly funded by the European Commission's 7th Framework Program. Conventional separation solutions are not appropriate to the remediation scenarios targeted by the HOVERSPILLTM project, mainly because low weight and compactness are absolutely required for transportation on a hovercraft. Namely, high separation efficiency, imposed to satisfy environmental legislation for water release, is particularly difficult to achieve with a compact separator when skimmed flow rate, oil content and density contrast are submitted to large variations. This paper describes the development of a customized patented centrifuge separator devoted to the specific needs of the HOVERSPILLTM project. Conceptual studies, prototype manufacturing and experimental validation are described. The TURBYLEC prototype tested at CEDRE's facilities has a bulk (size and weight) compatible with its integration on the HOVERSPILLTM platform. Tests results show that TURBYLEC matches with expected use (i.e. downstream of a non-selective skimmer). In this configuration, TURBYLEC separator shows very good oil / water separation performances for inlet oil contents up to 25%. In this range of operating conditions its cut diameter has been evaluated to 60 μm. In order to achieve the same separation performances as with TURBYLEC, which weighs only 70 kg (with liquids), it would be necessary to install an 8 m3 gravity separator. TURBYLEC separator has been developed for a very specific duty (i.e. for integration on an Hovercraft for Oil Spill remediation). Nevertheless, its proven performances render it particularly attractive, as a standalone system, for many other specific tasks in the field of oil spill remediation. It could also interest various other water treatment applications.

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Zhang, Kai Yong, and Hong Mei Yu. "Diatomite Experimental Study on New Wet Purification Process." Advanced Materials Research 1004-1005 (August 2014): 1386–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1386.

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Wet centrifugal separation process is used to purify diatomite by analyzing the properties of diatomite raw ore in Linjiang city, Jilin province. Experimental results determine the affecting sorting important indicators, including scrubbing agent and dosage, sieving mesh, centrifugal separation. The concentration of SiO2in the final diatomite is 86.76%, reaching primary soil standard. Compared with gravity sedimentation purification process, new technology method saves much time and achieves the ideal separation effect.

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Kim, Ki Young, Jong Sik Shin, and Dong Wha Park. "Separation of Pure Silicon from Al-Si Alloy Melts." Materials Science Forum 783-786 (May 2014): 186–91. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.186.

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Pure silicon can be obtained from Al-Si alloys by a combination of solvent refining and centrifugation. Primary silicon crystals are separated in the form of a foam after centrifugation. A vertical centrifugal separator is used which needs no more effort for further separation since each part of the high and low silicon content is divided automatically into two pieces after centrifugation. This centrifugal method does not use the density difference between two phases as in other methods, but uses the order of solidification in Al-Si alloys. How to make the Si foam, its characteristics including its density and strength, and purity of the extracted Si particles after acid leaching are reviewed.

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Liu, Jing Jing. "Engineering Research on Handling Heavy Aging Oil with Thermal Chemical Deposition and Centrifugal Separation." Applied Mechanics and Materials 448-453 (October 2013): 3058–61. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3058.

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The technology was used for handling aging oil by demulsifier thermal chemical deposition and horizontal scrow centrifuge. Under certain temperature, The heavy aging oil, mixed with a certain Demulsifier for demulsification, is loaded into the packaging three-phase Horizontal Screw Centrifuge for oil, water and soil separation, the water content of processed oil dropped to 10% below which meet oil remix and fuel oil requirement. The influence of liquid level adjusting board, the handling capacity, processing temperature and operating parameters of centrifuges are all discussed as well.

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Kim, Gwangho, Sanghwa Jeong, and Yang Jun Kang. "Ultrasound Standing Wave-Based Cell-to-liquid Separation for Measuring Viscosity and Aggregation of Blood Sample." Sensors 20, no. 8 (April 17, 2020): 2284. http://dx.doi.org/10.3390/s20082284.

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When quantifying mechanical properties of blood samples flowing in closed fluidic circuits, blood samples are collected at specific intervals. Centrifugal separation is considered as a required procedure for preparing blood samples. However, the use of centrifuge is associated with several issues, including the potential for red blood cell (RBC) lysis, clotting activation, and RBC adhesions in the tube. In this study, an ultrasonic transducer is employed to separate RBCs or diluent from blood sample. The ultrasonic radiation force is much smaller than the centrifugal force acting in centrifuge, it can avoid critical issues occurring under centrifuge. Then, the RBC aggregation and blood viscosity of the blood sample are obtained using the microfluidic technique. According to the numerical results, ultrasonic transducers exhibited a maximum quality factor at an excitation frequency of 2.1 MHz. Periodic pattern of acoustic pressure fields were visualized experimentally as a column mode. The half wavelength obtained was as 0.5 λ = 0.378 ± 0.07 mm. The experimental results agreed with the analytical estimation sufficiently. An acoustic power of 2 W was selected carefully for separating RBCs or diluent from various blood samples (i.e., Hct = 20% ~ 50%; diluent: plasma, 1x phosphate-buffered saline (PBS), and dextran solution). The present method was employed to separate fixed blood samples which tended to stack inside the tube while using the centrifuge. Fixed RBCs were collected easily with an ultrasonic transducer. After various fixed blood samples with different base solutions (i.e., glutaraldehyde solution, 1x PBS, and dextran solution) were prepared using the present method, RBC aggregation and the viscosity of the blood sample are successfully obtained. In the near future, the present method will be integrated into ex vivo or in vitro fluidic circuit for measuring multiple mechanical properties of blood samples for a certain longer period.

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Pauer, Viktor, Edit Csefalvay, and Peter Mizsey. "Treatment of soy bean process water using hybrid processes." Open Chemistry 11, no. 1 (January 1, 2013): 46–56. http://dx.doi.org/10.2478/s11532-012-0128-9.

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AbstractThe soy bean process water that is a by-product of soy processing technology can be utilized with a hybrid separation system recommended and investigated in this work. The aims of the soy bean water processing are to i.) concentrate the valuable components of the soy process water and ii.) reuse its water content. Two hybrid separation systems are considered and investigated: ultrafiltration followed by nanofiltration and centrifugal separation followed by nanofiltration. These hybrid separation systems are new in the area of their current application. Experiments verify that centrifugal separation is a more appropriate pre-treatment method for the removal of suspended solids and for the preservation of the sucrose content of the soy bean process water than ultrafiltration. Total sucrose can be rejected by nanofiltration membrane forming a sugar-rich retentate that contains other valuable components, too. Both tested hybrid processes result in clear and reusable permeates with low chemical oxygen demand that can be recycled to the production process reducing its water consumption and improving its sustainability. The recommended new hybrid separation system, centrifugal separation followed by nanofiltration, proves to be successful in this area of the biochemical industry.

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Bredykhin, Vadym, Andrey Pak, Petro Gurskyi, Sergey Denisenko, and Khrystyna Bredykhina. "Improving the mechanical-mathematical model of pneumatic vibration centrifugal fractionation of grain materials based on their density." Eastern-European Journal of Enterprise Technologies 4, no. 1(112) (July 12, 2021): 54–60. http://dx.doi.org/10.15587/1729-4061.2021.236938.

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This paper has substantiated the mechanical-mathematical modeling of the process of fractionation of grain material into fractions. It has been established that this could optimize the process parameters and would make it possible to design new or improve existing working surfaces of centrifugal separators. A mechanical-mathematical model of the pneumatic vibratory centrifugal separation of grain material by density has been improved. This research is based on the method of hydrodynamics of multiphase media. The improved mechanical-mathematical model takes into consideration the interaction between the discrete and continuous phases of grain material by introducing conditions of interaction at the interface of these phases. In the hydrodynamic modeling of the movement of the circular layer of seeds, the coefficient of dynamic viscosity of discrete and continuous phases was taken into consideration. It was established that the pneumatic vibratory centrifugal separation process parameters are critically affected by the circular frequency of rotation of the cylindrical working surface, the frequency and amplitude of its oscillations. As well as such process characteristics as the airflow rate, dynamic viscosity coefficient, the average thickness of a grain material layer, and the mean density of its particles. Rational values for the technical parameters of the grain material pneumatic vibratory centrifugal fractionation process in terms of density have been determined by using the improved mechanical-mathematical model. The amplitude and oscillation frequency of the working surface are in the ranges A=(35…50)·10–5 m, ω=15.0...15.6 rad/s. The circular rotation frequency of the working surface, ω=24...25 rad/s. The airflow rate, V=2 m/s. It was established that using the improved mechanical-mathematical model of fractionation makes it possible to improve the performance of a pneumatic vibratory centrifugal separator by 9 %. At the same time, the effectiveness of grain material separation could reach 100 %.

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Santos, João H. P. M., Mafalda R. Almeida, Cláudia I. R. Martins, Ana C. R. V. Dias, Mara G. Freire, João A. P. Coutinho, and Sónia P. M. Ventura. "Separation of phenolic compounds by centrifugal partition chromatography." Green Chemistry 20, no. 8 (2018): 1906–16. http://dx.doi.org/10.1039/c8gc00179k.

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Nodir, Yakhyayev, Raximov Bekzod, Alikabulob Shukhrat, and Shukrullayev Botir. "Liquid-Phase Separation Of Oil Sludges In The Field Of Centrifugal Forces Using A Deemulgator." American Journal of Applied sciences 03, no. 07 (July 30, 2021): 12–17. http://dx.doi.org/10.37547/tajas/volume03issue07-03.

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The process of separation of oil sludge, which is obtained after cleaning the oil refining units of the Bukhara oil refinery, is presented. Methods of obtaining petroleum liquid rafinate using several experimental laboratory installations for liquid-phase separation of oil sludge in a centrifugal force field with the use of a deemulgator "Disolvan-4411" and sawdust from the processing of old furniture of local raw materials are used. The composition and amount of heavy sediment and clarified oil products from oil sludge were obtained

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Shimizu, Hiroyuki, and Eugenie S. Kleinerman. "Peripheral blood monocyte separation by counterflow centrifugal elutriation." Journal of the Japan Society of Blood Transfusion 35, no. 1 (1989): 10–15. http://dx.doi.org/10.3925/jjtc1958.35.10.

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Borujeni, Ehsan Espah, and Andrew L. Zydney. "Separation of plasmid DNA isoforms using centrifugal ultrafiltration." BioTechniques 53, no. 1 (July 2012): 49–56. http://dx.doi.org/10.2144/0000113890.

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