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gas dispersion measurements in a flotation cell

Gas dispersion measurements in a flotation cell ...

7 行  01-11-2003  Three new techniques for measuring gas dispersion properties: local gas holdup, local gas ...

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Gas dispersion measurements in flotation cells -

19-10-2007  Gas dispersion measurements in flotation cells 1. Gas dispersion sensors. Gas dispersion is the collective term for superficial gas (air) velocity (or gas rate,... 2. Sensor installation. The literature includes several reports of measurements performed during the development stage... 3.

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Gas dispersion measurements in industrial flotation cells ...

01-05-2006  Gas dispersion measurements in industrial flotation cells 1. Introduction. It is widely acknowledged that separating valuable mineral particles from gangue particles by flotation... 2. Experimental. Gas dispersion measurements, such as bubble size, gas hold-up and gas velocity, can be used to... 3. ...

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Gas dispersion measurements in flotation cells -

The McGill Mineral Processing group has developed instruments and procedures to measure three variables in industrial cells: superficial gas velocity, gas-holdup and bubble size distribution.

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Gas dispersion measurements in a flotation cell Semantic ...

Abstract Three new techniques for measuring gas dispersion properties: local gas holdup, local gas rate (superficial gas velocity) and bubble size distributions have been developed. Gas dispersion properties were measured in a 50 L lab scale flotation cell, using these techniques. The cell was operated under batch conditions, two-phase system, (gas–liquid).

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Gas Dispersion Measurements in Coal Flotation Cells

Gas dispersion measurements, such as bubble size, gas hold-up and gas velocity, can be used to characterize the hydrodynamic conditions in the pulp phase of a particular flotation cell. In simple terms, gas dispersion is defined as how well the air entering a flotation cell is dispersed throughout the entire volume of the cell.

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(PDF) Gas dispersion measurements in flotation cells ...

Gas dispersion measurements in flotation cells. International Journal of Mineral Processing, 2007. James Finch

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Gas dispersion measurements as a diagnostic tool for the ...

measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher J g and d 32 values measured closest to the impeller, whist low J g and d 32 values were measured furthest from the impeller. Subsequently, a flotation impeller change program was undertaken in order improve gas dispersion in the cells and thus ...

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Measurement of Gas–Solid Dispersion Characteristics in a ...

03-07-2020  Gas dispersion parameters such as bubble size, gas hold-up and air superficial velocities vary broadly in the industrial flotation cells. Zhu et al. [ 7 ] discussed that bubble Sauter mean diameter and aeration rate were effected by surfactant concentration and superficial air and liquid velocities.

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The Use of Gas Dispersion Measurements to Improve ...

01-01-2005  In some cases the measurements have been directly linked with metallurgical performance while in others the gas dispersion surveys on their own have proved very useful in understanding the behaviour of the flotation cells.

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Gas Dispersion Measurements in Industrial Flotation Cells

Typical cell characterisation measurements show a wide spread in values, even in the same cell types and sizes performing similar duties. In conventional flotation cells, the typical gas hold-up values range from 3 - 20 per cent, bubble sizes range between 1 and 2 mm, and superficial gas

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Gas dispersion measurements in industrial flotation cells ...

Typical cell characterization measurements show a wide spread in values, even in the same cell types and sizes performing similar duties. In conventional flotation cells, the typical gas hold-up values range from 3% to 20%, bubble sizes range between I and 2 mm, and superficial gas velocity ranges from 1

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Gas dispersion measurements in flotation cells: C.O.

Gas dispersion measurements in flotation cells C.O. Gomez , J.A. Finch McGill University, Canada Received 7 June 2006; received in revised form 30 January 2007; accepted 28 March 2007 Available online 12 April 2007. Abstract Progress in science and engineering relies on accurate and precise measurements. Flotation is no exception.

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Gas Dispersion Measurements in Coal Flotation Cells ...

Harbort, G and Alexander, D (2006) Gas Dispersion Measurements in Coal Flotation Cells. In: Proceedings of the International Seminar on Mineral Processing Technology and Indo-Korean Workshop on Resource Recycling (MPT-2006), March 8-10, 2006, NML, Chennai.

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Gas dispersion measurements as a diagnostic tool for the ...

measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher J g and d 32 values measured closest to the impeller, whist low J g and d 32 values were measured furthest from the impeller. Subsequently, a flotation impeller change program was undertaken in order improve gas dispersion in the cells and thus ...

More

ABM Proceedings - GAS DISPERSION MEASUREMENTS

The measurements were carried out on roughers, cleaners and scavengers in order to map the cells and understand how gas is dispersed in the cells. From the measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher Jg and d32 values measured closest to the impeller, whist low Jg and d32 values were measured furthest from the impeller.

More

Measurement of Gas–Solid Dispersion Characteristics in a ...

03-07-2020  Gas dispersion parameters such as bubble size, gas hold-up and air superficial velocities vary broadly in the industrial flotation cells. Zhu et al. [ 7 ] discussed that bubble Sauter mean diameter and aeration rate were effected by surfactant concentration and superficial air and liquid velocities.

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[PDF] On the gas dispersion measurements in the

Abstract This work shows the results of gas dispersion parameters in a fully controlled laboratory column flotation cell, namely gas hold-up (eg), superficial gas velocity (Jg) and bubble size distribution, measured directly by image analyses using the LTM-BSizer. Gas hold-up and bubble size (and their distribution) were found to be strongly dependent on Dowfroth 250 concentration and ...

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Experiences in using gas dispersion measurements to ...

17-10-2014  The performance of a flotation circuit is largely the result of the operator’s response to visual clues. This includes manipulation of the gas input and how it is distributed to cells in a bank. A new gas dispersion technology was presented which was conducted to perform characterization tests in Outokumpu 30 m3 and 50 m3 flotation cells installed at Thompson Vale’s concentrator, and ...

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1 Froth Flotation – Fundamental Principles

no flotation can occur. Contact between particles and bubbles can be accomplished in a flotation cell such as the one shown schematically in Figure 5. Figure 5: Simplified schematic of a conventional flotation cell. The rotor draws slurry through the stator and expels it to the sides, creating a suction that draws air down the shaft of the stator.

More

Gas dispersion measurements in flotation cells: C.O.

Gas dispersion measurements in flotation cells C.O. Gomez , J.A. Finch McGill University, Canada Received 7 June 2006; received in revised form 30 January 2007; accepted 28 March 2007 Available online 12 April 2007. Abstract Progress in science and engineering relies on accurate and precise measurements. Flotation is no exception.

More

Gas dispersion measurements as a diagnostic tool for the ...

measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher J g and d 32 values measured closest to the impeller, whist low J g and d 32 values were measured furthest from the impeller. Subsequently, a flotation impeller change program was undertaken in order improve gas dispersion in the cells and thus ...

More

ABM Proceedings - GAS DISPERSION MEASUREMENTS

The measurements were carried out on roughers, cleaners and scavengers in order to map the cells and understand how gas is dispersed in the cells. From the measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher Jg and d32 values measured closest to the impeller, whist low Jg and d32 values were measured furthest from the impeller.

More

Gomez, C.O. and Finch, J.A. (2007) Gas Dispersion ...

Gomez, C.O. and Finch, J.A. (2007) Gas Dispersion Measurements in Flotation Cells. International Journal of Mineral Processing, 84, 51-58.

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Gas dispersion measurements in a flotation cell Article ...

Article “Gas dispersion measurements in a flotation cell” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. By linking the information entered, we provide opportunities to make unexpected discoveries and obtain knowledge from ...

More

Experiences in using gas dispersion measurements to ...

17-10-2014  The performance of a flotation circuit is largely the result of the operator’s response to visual clues. This includes manipulation of the gas input and how it is distributed to cells in a bank. A new gas dispersion technology was presented which was conducted to perform characterization tests in Outokumpu 30 m3 and 50 m3 flotation cells installed at Thompson Vale’s concentrator, and ...

More

Gas Dispersion Measurements in Coal Flotation Cells -

Gas Dispersion Measurements in Coal Flotation Cells - CORE ...

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(PDF) Gas dispersion in flotation machines (industrial ...

Gas holdup (eg) is the volumetric fraction (or %) of gas in the aerated slurry. The sensor is conductivity-based (Tavera et al., 1996) comprising (Fig. 2) two flow cells, an open cell to measure the conductivity of aerated slurry (jslg) and a siphon cell to measure the conductivity of de- aerated slurry (jsl).

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On-Line Sensor for Measuring Gas Velocities in Laboratory ...

Gas velocity (Jg) measurements conducted close to the froth-pulp interface over the cross-section of a flotation cell reveal how efficiently the incoming air is being dispersed throughout the volume of the cell. Furthermore, measurements of Jg at deepest locations in the cell provide valuable information about air recirculation and dispersion conditions in the bulk volume of the cell.

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1 Froth Flotation – Fundamental Principles

no flotation can occur. Contact between particles and bubbles can be accomplished in a flotation cell such as the one shown schematically in Figure 5. Figure 5: Simplified schematic of a conventional flotation cell. The rotor draws slurry through the stator and expels it to the sides, creating a suction that draws air down the shaft of the stator.

More

Gas dispersion measurements in flotation cells: C.O.

Gas dispersion measurements in flotation cells C.O. Gomez , J.A. Finch McGill University, Canada Received 7 June 2006; received in revised form 30 January 2007; accepted 28 March 2007 Available online 12 April 2007. Abstract Progress in science and engineering relies on accurate and precise measurements. Flotation is no exception.

More

Measurement and modelling of gas dispersion ...

The gas dispersion characteristics in mechanical flotation cells have a significant effect on the overall flotation performance. Three major properties that can be measured in characterising the gas dispersion in a flotation cell are bubble size, gas hold-up, and superficial gas velocity. Another property that is equally important in flotation is bubble surface area flux which is calculated ...

More

Gas dispersion measurements in industrial flotation

Typical cell characterization measurements show a wide spread in values, even in the same cell types and sizes performing similar duties. In conventional flotation cells, the typical gas hold-up values range from 3% to 20%, bubble sizes range between I and 2 mm, and superficial gas velocity ranges from 1

More

ABM Proceedings - GAS DISPERSION MEASUREMENTS

The measurements were carried out on roughers, cleaners and scavengers in order to map the cells and understand how gas is dispersed in the cells. From the measurements it was discovered that some of the cells were not dispersing gas evenly; i.e. higher Jg and d32 values measured closest to the impeller, whist low Jg and d32 values were measured furthest from the impeller.

More

Gas dispersion measurements in a flotation cell Article ...

Article “Gas dispersion measurements in a flotation cell” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. By linking the information entered, we provide opportunities to make unexpected discoveries and obtain knowledge from ...

More

Gomez, C.O. and Finch, J.A. (2007) Gas Dispersion ...

Gomez, C.O. and Finch, J.A. (2007) Gas Dispersion Measurements in Flotation Cells. International Journal of Mineral Processing, 84, 51-58.

More

Gas dispersion measurements in flotation cells Article ...

Article “Gas dispersion measurements in flotation cells” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. By linking the information entered, we provide opportunities to make unexpected discoveries and obtain knowledge from ...

More

An Investigation of the Gas Dispersion Properties of ...

An Investigation of the Gas Dispersion Properties of Mechanical Flotation Cells: an In-Situ Approach. Bubble size is considered to be one of the most important parameters affecting the performance of froth flotation cells. However, monitoring, controlling and predicting bubble size is a very challenging task. This dissertation presents results ...

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Rheological effects on gas dispersion in a pilot scale ...

Froth flotation is a separation method used for the beneficiation of a considerable portion of the world's mineral ores. The majority of flotation occurs in mechanical flotation cells, where effective gas dispersion is a primary requirement for particle-bubble contacting.

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1 Froth Flotation – Fundamental Principles

no flotation can occur. Contact between particles and bubbles can be accomplished in a flotation cell such as the one shown schematically in Figure 5. Figure 5: Simplified schematic of a conventional flotation cell. The rotor draws slurry through the stator and expels it to the sides, creating a suction that draws air down the shaft of the stator.

More