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The air flow number in flotation machine scale up

Sep 01, 1976 The air flow number in flotation machine scale-up. Int. J. Miner. Process., 3: 257--280. The flotation cell is quantified as a mixing device for one, two, and three phase systems using combinations of water, air, and solids. To do this, power consumption was measured as a function of impeller speed, rate of aeration, and solids concentration

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    Scale-up of Flotation Processes Mikhail Burstein and Lev Filippov January 2010 Publication Number: CSRCR2010-01 ... of the scale of the flotation machine is the factor determining the scale-up considerations. ... air and feed flow rates, e.a.), one can build the scale-up

  • Flotation Cell Hydrodynamics
    Flotation Cell Hydrodynamics

    Aug 12, 2019 The air flow number is the dimensionless group QA/ND where QA is the air flow rate at atmospheric pressure. It was found in all cases that the power ratio did not decrease immediately as NQ exceeded zero, but remained constant until NQ∼10- and then decreased as NQ increased further. ... Flotation machine scale-up is a problem with two

  • Impeller speed, air, and power requirements in
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    Mar 01, 1974 Impeller speed, air, and power requirements in flotation machine scale- up. Int. J. Miner. Process., 1 : 51--64. Experimental and operational data, flotation criteria, machine design and scale-up principles are reviewed and combined in a chart encompassing scale-up detail for various machine types. Topics requiring further study are mentioned

  • Hydrodynamics and scale up in Rushton turbine
    Hydrodynamics and scale up in Rushton turbine

    Nov 01, 2006 Scale-up on the basis of maintaining a constant impeller tip velocity and superficial gas velocity (and hence air flow number) was not successful (results not shown). In every case, the flotation rate constant for the 10 dm 3 cell was significantly less than in the 2.25 dm 3

  • Scale-up in froth flotation: A state-of-the-art review
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  • WEMCO 1+1 Flotation Machines
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    WEMCO Flotation Machine “Design Scale-Up” The table on the left lists key design parameters which govern geometric and hydrodynamic scaleup procedures for WEMCO 1+1 machines, assuring comparable metallurgical performance in all cell sizes. Air Escape Velocity recognizes air flooding limits where excess air flow

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    However, in a flotation cell, the presence of air and the further necessity for balancing air and pulp flows to satisfy both flotation and suspension requirements simultaneously, introduces at least one other variable: air flow Qa; and at least one other dimensionless group the Air Flow Number Qa/ND . This may also be expressed as Qa/A/ ND

  • 1 Froth Flotation – Fundamental Principles
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  • (PDF) A novel scale-up approach for mechanical flotation
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    Scale-up methods for flotation cell design have been mainly Harris and Raja (1970) found that by scaling up from the labo- based on geometrical similitude and dimensional analysis with ratory to industrial cell performance, the flotation rate constant the use of dimensionless numbers (air flow number, power num- can decrease up to one order of

  • SCALE-UP OF MECHANICALLY AGITATED FLOTATION
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    insight into the inner working of the Wemco flotation machine, such as air dispersion, turbulence levels, separation zones and solids concentration. Design changes to the rotor, disperser, hood and geometrical lay-out produced a marked improvement in flotation conditions. It also supported certain dimensionless numbers measured in full scale

  • air flotation machine air flotation cell
    air flotation machine air flotation cell

    The Air Flow Number In Flotation Machine Scale-Up. the flotation cell is quantified as a mixing device for one, two, and three phase systems using combinations of water, air, and solids.,china air flotation lab,flotation machine bf 1a air lab d12 xjk ore xcf gold line nile metal wemco high efficient laboratory continuous multi-cell flotation machine

  • Flotation Developments & Best Practice - International
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    Nov 04, 2013 “Historically, flotation cell design criteria and scale-up have emphasised pulp zone recovery. Scale-up of Dorr-Oliver or Xcell forced air flotation machines and Wemco self-aspirated flotation equipment cells was accomplished by maintaining geometric and hydrodynamic similarity within the

  • Flotation Machines - Mineral Processing & Metallurgy
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    Jun 22, 2015 The most rapidly growing class of flotation machine is the column machine, which is, as its name implies, a vessel having a large height-to-diameter ratio (from 5 to 20) in contrast to mechanical cells. This type of machine provides a counter-current flow of air bubbles and slurry with a long contact time and plenty of wash water

  • (PDF) Flotation Equipment and Processes
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    In the flotation column, countercurrent flow is . ... Dissolved Air Flotation Machine. ... TankCell e500 Development and Scale-up

  • Design of Flotation Cells and Circuits
    Design of Flotation Cells and Circuits

    Jun 19, 2019 The accelerating trend to larger flotation cells will be considered in these aspects: picking the right equipment and putting it together in the right manner. The first problem we run into in choosing the right machine is the scale-up from the laboratory or pilot-plant test results to full scale, and this is a complex matter

  • Flotation Column: A Process Unit for Cleaning Up Paper
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    flotation column was controlled by increasing proportionally the feed and accepts flow rates. For our tests, the air content in the collection zone was maintained stable

  • [PDF] CFD MODEL OF A SELF-AERATING FLOTATION CELL
    [PDF] CFD MODEL OF A SELF-AERATING FLOTATION CELL

    The effect of impeller speed on the air flow in a selfaerated Denver laboratory flotation cell was investigated using computational modelling. Air is induced into the slurry by the impeller’s rotating action. The rate of air flow is determined by the suction pressure created by the impeller, the hydrostatic head of the slurry and the frictional losses along the delivery shaft from the inlet

  • Principles and Technologies of Flotation Machines
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    Principles and Technologies of Flotation Machines. Authors. (view affiliations) Zhengchang Shen. Highlights flotation equipment and technologies used mainly in mineral processing. Describes flotation equipment, flotation circuits, and flow sheets in detail. Includes both fundamental theory and examples from industrial engineering practice. Book

  • A novel scale-up approach for mechanical flotation cells
    A novel scale-up approach for mechanical flotation cells

    A review of the state-of-the-art on the scale-up of froth flotation machines was published recently, where the flotation tanks scale-up was comprehensively analyzed from two aspects, namely

  • University of Cape Town
    University of Cape Town

    attributed to differences in flow patterns in the cells. Air holdup was found to be largely insensitive to changes in air flowrate and impeller speed in cells ... 2.6.3 Mechanical Flotation Machines 53 2.6.3.1 Aker Flotation Machine 54 ... 2.7.8 Scale-up Criteria 83 2.7.8.1 Turbulence Criteria 84

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