Flotation technique: Its mechanisms and design parameters

Prakash, Ritesh; Majumder, Subrata Kumar; Singh, Anugrah

doi:10.1016/j.cep.2018.03.029

Cited by 115 publications

(40 citation statements)

References 216 publications

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“…Flotation column is intensively used in the mineral processing industry [2]. The success of column flotation depends on the hydrophobic and hydrophilic nature of particles or it may be imparted using reagent [2]. The classical scheme of a flotation column is shown in Fig.…”

Section: Flotation Columnmentioning

confidence: 99%

Predictive Control applied to a mathematical model of a Flotation Column

Vale¹,

Azevedo²

2018

IJAERS

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As the flotation process is multivariable, this work investigates the implementation of a predictive multivariable controller for operation a typical flotation column. This controller was tested using a model with delays of a prototype column mounted on Nuclear Technology Development Center (CDTN). Taking as input signals the flushing wash water, air feeding, and non floated fraction flow rates, the controller determines the froth layer height and air holdup in the recovery zone. This control maintains stability. The operation of the controller is based on the optimization of a cost function. The conducted tests were based on the change of setpoint of the controlled variables. It was intended to analyze the system behavior for different operation conditions, considering the constraints of the process and the response speed.

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Section: Flotation Columnmentioning

confidence: 99%

Predictive Control applied to a mathematical model of a Flotation Column

Vale¹,

Azevedo²

2018

IJAERS

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“…The gas holdup is an important parameter that determines the efficiency of column sorting, and directly determines the amount of floating minerals that bubbles can load. The high gas holdup in the flotation column means that the bubbles are more stable and resistant to break, have stronger mechanical properties and can carry more minerals, which is beneficial to flotation However, when the gas holdup is too low or too high during mineral flotation, it will affect the back mixing and mass transfer in the column, which will affect the yield and recovery rate of the concentrate (Prakash et al, 2018;Sarhan et al, 2017). Different minerals have their own optimal range of gas holdup, and they can be affected by flotation device, surfactant (foaming agents, collectors, pH regulators, etc.…”

Section: Introductionmentioning

confidence: 99%

Study on gas holdup characteristics of micro-bubble countercurrent contacting flotation column

Han¹

2020

Physicochem. Probl. Miner. Process.

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In order to explore the gas holdup distribution of the microbubble countercurrent contact flotation column in the hematite column cationic reverse flotation process, respectively using conductance method and pressure drop method for air and water as experimental medium characteristics research of flotation column, the research group carries on the gas holdup, examines the aeration quantity, the fill medium and cation collector alkyl polyamine ether (An amine collector-GE-609 which consists of four elements: carbon, hydrogen, oxygen and nitrogen)within the column on the influence of the axial and radial gas holdup. The results show that the axial gas holdup from the bottom of the column to the top of the column increases with the increase of height in the range of 0.05-0.07dm 3 /s. The radial distribution of gas holdup generally shows the distribution law of "intermediate high, low on both sides". After the filling medium is added into the column, the radial gas holdup is evenly distributed compared with the empty column, and the gas holdup is increased. Due to the high foaming performance of GE-609, the gas holdup in the column can be increased by changing the amount of aeration and the concentration of the reagent, which can exceed 60% at the maximum. Like other alcohol foaming agents, as time passes, the effect of GE-609 weakens and the gas holdup in the column gradually decreases. The addition of quantitative HCl can improve the foaming performance of GE-609, and the gas holdup in the column is significantly improved and the stability is enhanced.

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“…Dissolved air flotation (DAF) processes have been developed over the past few decades and have been found to represent feasible technical solutions for the removal of contaminants from water [3]. Conceptually, DAF processes use solution aeration to remove contaminants such as ions, liquid effluent or solid particles [4][5][6], or fast oxygenation to chemically disintegrate hazardous compounds [3,7].…”

Section: Introductionmentioning

confidence: 99%

Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency

et al. 2020

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A novel auto-aspirated sparger is examined experimentally in a closed-loop reactor (CLR) at lab scale using particle image velocimetry, high-speed camera and oxygen mass transfer rate measurements. State-of-the-art 3D printing technology was utilized to develop the sparger design in stainless steel. An insignificant change in the bubble size distribution was observed along the aerated flow, proving the existence of a low coalescence rate in the constraint domain of the CLR pipeline. The studied sparger created macrobubbles evenly dispersed in space. In pure water, the produced bubble size distribution from 190 to 2500 μm is controlled by liquid flow rate. The bubble size dynamics exhibited a power-law function of water flow rate approaching a stable minimum bubble size, which was attributed to the ratio of the fast-growing energy of the bubble surface tension over the kinetic energy of the stream. Potentially, the stream energy can efficiently disperse higher gas flow rates. The oxygen transfer rate was rapid and depended on the water flow rate. The aeration efficiency below 0.4 kW/m3 was superior to the commonly used aerating apparatuses tested at lab scale. The efficient gas dissolution technology has potential in water treatment and carbon capture processes applications.

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Flotation technique: Its mechanisms and design parameters

Cited by 115 publications

References 216 publications

Predictive Control applied to a mathematical model of a Flotation Column

Predictive Control applied to a mathematical model of a Flotation Column

Study on gas holdup characteristics of micro-bubble countercurrent contacting flotation column

Auto-Aspirated DAF Sparger Study on Flow Hydrodynamics, Bubble Generation and Aeration Efficiency

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