Reynolds Number In Flotation Cells

2020-08-04T19:08:13+00:00
  • Turbulence in flotation cells - ScienceDirect

    1987-8-1  Log [ND (D/T) "2/:~ g/1.17] =f (NDz) for various types of flotation cells. 2 NO2 ferences could stem from the unknown parameters left out and their changes as a function of the Reynolds number. On the basis of these results it can be concluded that for the investigated cell types u' is at least nearly the same and probably independent of the ...

  • Get Price
  • (PDF) Numerical investigations into the effect of ...

    Numerical investigations into the effect of turbulence on collision efficiency in flotation. March 2021; Minerals ... cells. This paper ... Luttrell (1989) for intermediate bubble Reynolds number ...

  • Get Price
  • CFD simulation of single-phase flow in flotation cells ...

    Request PDF CFD simulation of single-phase flow in flotation cells: Effect of impeller blade shape, clearance, and Reynolds number A series of numerical simulations of turbulent single-phase ...

  • Get Price
  • CFD simulation of single-phase flow in flotation cells ...

    2019-9-1  Closely following their pioneering work, Koh and co-workers published a number of papers in which they developed flotation kinetic rate model for lab scale flotation cells , , , . Evans et al. [8] studied mixing and gas dispersion in lab scale flotation cells using Eulerian multiphase CFD simulations.

  • Get Price
  • Mixing and gas dispersion in mineral flotation cells ...

    For instance, (Evans et al., 2008) investigated mixing and gas dispersion behaviors in flotation cells where the authors used a single bubble number density equation to predict BSD in the cell ...

  • Get Price
  • (PDF) Development of CFD models of mineral

    Closely following their pioneering work, Koh and co-workers published a number of papers in which they developed flotation kinetic rate model for lab scale flotation cells

  • Get Price
  • Mixing and gas dispersion in mineral flotation cells ...

    2008-12-1  More recently, there have been a number of studies utilising computational fluid dynamics (FCD) to model the behaviour inside flotation cells, not only for mineral processing operations (e.g. Tiitinen et al., 2003, Koh and Schwarz, 2003, Koh and Schwarz, 2006, Koh and Schwarz, 2007, Koh and Schwarz, in press, Koh et al., 2000, Koh et al., 2003 ...

  • Get Price
  • Column Flotation • Theory and Practice

    2016-7-6  Column flotation which employs a counter-current flow of slurry and air bubbles has proved to be a better alternative to the conventional mechanical cells for separation of minerals. Because of the distinct advantages of column flotation over mechanical cells, it is gaining wider acceptance in industry.

  • Get Price
  • CFD MODEL OF A SELF-AERATING FLOTATION CELL

    2006-11-20  P780A project, flotation cells up to 150 m3 from Outokumpu and Minerals have been investigated to improve flotation performance (Koh et al., 2003a). In the present paper, the effect of impeller speed on the air flow in a self-aerated Denver laboratory flotation cell was investigated using CFD modelling. The air flow rates

  • Get Price
  • Journal of Physics: Conference Series PAPER OPEN

    on the particle size, but strongly on the particle density and the bubble Reynolds number R eb. Flotation is generally modeled as a first-order rate process with respect to the number of particles and the number of bubbles in the collision-attachment step, and a detachment process with respect to the number of bubble-particle aggregates [28]. 2.3.

  • Get Price
  • Making flotation cells work - Froth Flotation (Sulphide ...

    2 天前  For a number of years a mine struggled to float a sulfide mineral and was getting less than 50% recovery even after installing a rotor and stator “upgrade”. We did minor modifications to the rougher float cells and achieved a 19% increase in recovery. These improvements would apply to all flotation cells regardless of what is being recovered.

  • Get Price
  • Bioseparation Basics - AIChE

    2014-11-11  number, Sh (9): where Re is the Reynolds number: Sc is the Schmidt number: d h is the equivalent diameter of the channel: u b is the bulk stream velocity, ρ is the density of the fluid, and µ is the viscosity of the fluid. An example of a correlation for Sh is (10): Example 1: Protein ultrafiltration

  • Get Price
  • tie iffectofFlotationCellShapeon is DeinkingBehaviour

    2020-12-17  Between different flotation systems, cells and injectors can vary considerably eg. in size, shape and internal design and this can give rise to variation in deinking efficiency across single cells and across the flotation system, depending on the number ofcells in the systemandthe configurationused. Flotation deinking is based on technology ...

  • Get Price
  • Model-based Computer Simulation of Froth Flotation

    2020-9-28  the pulp. As with mechanicals cells, the froth overflows into a launder and the tails exit through the bottom of the cell. Column cells typically use wash water to reduce the effects of entrainment and improve the product grade (Finch, 1994). Figure 2: Column Flotation Cell Both mechanical and column cells employ a series of chemical reagents ...

  • Get Price
  • Modeling Erosion Wear Rates in Slurry Flotation Cells ...

    2011-8-11  In processes using slurry as the working fluid, wear due to solid particles impinging on elements of the process units is a serious reliability issue. This study considers modeling wear damage in flotation cells, which are widely used in mineral processing. Flotation cells are typically cylindrical vessels where an impeller is used to agitate the fluid, enabling the liberation of the minerals ...

  • Get Price
  • Flotation Cell Design Application of Fundamental ...

    Figure 2 Hydrodynamic zones in a mechanical flotation cell.. Figure 3 Schematic diagram of formation of bubbles in mech-anical cells (after Grainger Allen, 1970; courtesy of Transactions of the Institute of Metallurgy, UK).. bubble}particle aggregates rise up in a relatively less turbulent region. This region also helps in reducing the number of gangue minerals which may have been entrained ...

  • Get Price
  • Flotation Developments Best Practice -

    2013-11-4  “Flotation cells have increased in size over the last thirty years and there have been significant changes in cell layout, technology and design. ... The hydrodynamic functions are a set of dimensionless numbers which include Reynolds number, Power number, Froude number, superficial gas velocity, bubble air surface flux and air flow number ...

  • Get Price
  • Flotation Developments Best Practice -

    2013-11-4  “Flotation cells have increased in size over the last thirty years and there have been significant changes in cell layout, technology and design. ... The hydrodynamic functions are a set of dimensionless numbers which include Reynolds number, Power number, Froude number, superficial gas velocity, bubble air surface flux and air flow number ...

  • Get Price
  • Hydrodynamic interactions at low Reynolds number:

    2013-4-19  Sinking of Pseudo-nitzschia cells in a liquid medium under the effect of gravity is characterized by an extremely low Reynolds number (Re = UL/ν, with U being the velocity, L the length of the object and ν the kinematic viscosity of the fluid), a dimensionless number that gives a measure of the ratio between inertial and viscous forces.

  • Get Price
  • ImplementatIon of the hydrofloat ... - Eriez Flotation

    2016-3-24  suspension, η is the apparent viscosity of the fluid, re is reynolds number, φ is the volumetric concentration of solids, φ ... using conventional flotation machines, column flotation cells, or other novel techniques such as belt flotation (moudgil and gupta, 1989). the fine fraction generally responds well to froth flotation. In most

  • Get Price
  • HYBRID ENERGY FLOTATION™ – ON THE OPTIMIZATION

    2012-9-6  the CFD model outputs on large industrial cells is discussed later. Attachment model The flotation rate attachment constant / may be defined as: , [1] where the individual probabilities of the sub-processes of bubble-particle collision, attachment, ... where the bubble Reynolds number is

  • Get Price
  • Bioseparation Basics - AIChE

    2014-11-11  number, Sh (9): where Re is the Reynolds number: Sc is the Schmidt number: d h is the equivalent diameter of the channel: u b is the bulk stream velocity, ρ is the density of the fluid, and µ is the viscosity of the fluid. An example of a correlation for Sh is (10): Example 1: Protein ultrafiltration

  • Get Price
  • tie iffectofFlotationCellShapeon is DeinkingBehaviour

    2020-12-17  Between different flotation systems, cells and injectors can vary considerably eg. in size, shape and internal design and this can give rise to variation in deinking efficiency across single cells and across the flotation system, depending on the number ofcells in the systemandthe configurationused. Flotation deinking is based on technology ...

  • Get Price
  • Flotation Cell Design Application of Fundamental ...

    Figure 2 Hydrodynamic zones in a mechanical flotation cell.. Figure 3 Schematic diagram of formation of bubbles in mech-anical cells (after Grainger Allen, 1970; courtesy of Transactions of the Institute of Metallurgy, UK).. bubble}particle aggregates rise up in a relatively less turbulent region. This region also helps in reducing the number of gangue minerals which may have been entrained ...

  • Get Price
  • CFD Simulation of Gas-Liquid Flow in a Large Scale ...

    2017-10-29  145 Volume 2 Number 3 2010 CFD Simulation of Gas-Liquid Flow in a Large Scale Flotation Cell J. W. Zhou1,2, T. Song2, Z. C. Shen2 1Northeastern University, Shenyang 110004, China 2Beijing General Research Institute of Mining and Metallurgy, 1

  • Get Price
  • ESTIMATION OF GAS HOLDUP, DIAMETER AND

    2010-9-23  In flotation, soljd particles partition between the liquid phase (i.e., are in suspension) and the gas phase (i.e., are attached to the bubble surface). The presence of solids will cause changes in bubble rise velocity and consequently gas holdup. This is a situation pertinent to flotation but one difficult to explore experimentally.

  • Get Price
  • Geometallurgical modelling of the Collahuasi flotation

    2017-2-6  2. Flotation kinetics modelling in conventional cells Several authors have modelled flotation as a first order process (Kelsall, 1961; Arbiter and Harris, 1962; Mao and Yoon, 1997), characterized by a flotation rate constant k: dN p dt ¼ kN p ð1Þ where N p is the corresponds to the particle concentration in the machine. Eq.

  • Get Price