An acoustic technique for measurement of bubble solids mass loading: (b) Monitoring of Jameson cell flotation performance by passive acoustic emissions

Spencer, Steven J.; Bruniges, Ryan; Roberts, Giffard; Sharp, Vic; Catanzano, Alvaro; Bruckard, Warren J.; Davey, Kevin J.; Zhang, Wen

doi:10.1016/j.mineng.2012.02.011

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…Where r 0 is the bubble radius, P 0 the ambient pressure, γ the ratio of specific heats for the gas, and ρ 0 is the liquid density. However, A. Prateepasen and his colleagues considered the maximum diameter of a stable bubble, D max and the collapse instantaneous pressure, P b they revised the Minnaert equation as

{normalf}_{normalb} = \frac{1}{{πD}_{max}} \sqrt{\frac{{3γp}_{normalb}}{{normalρ}_{0}}}

…”

Section: Resultsmentioning

confidence: 99%

Cluster analysis of acoustic emission signals in pitting corrosion of low carbon steel

Li²,

et al. 2015

Materialwissenschaft Werkst

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The pitting corrosion characteristics of low carbon steel specimens are studied by acoustic emission (AE) and electrochemical techniques, in a 3.0 wt.% NaCl solution acidified to pH 2.0. The acoustic emission signals generated by pitting corrosion are classified based on multiple acoustic emission parameters using K-means clustering algorithm, then each classified signals are analyzed by acoustic emission parameters correlation plot and distribution with time. Furthermore, each acoustic source characteristics is extracted using Gabor wavelet transform (WT) in the time and frequency domain. An error back propagation (BP) artificial neural network (ANN) is trained according to the classified signals, so as to successfully identify the acoustic emission signals from parallel experiments. Experimental results show that the hydrogen bubble activation, oxidized film rupture and pit growth are typical acoustic emission sources in pitting corrosion process, which can be effectively classified by cluster analysis and recognized by back propagation neural network. The data gathered from laboratory tests combined with the real data from acoustic emission online storage tank floor inspection can help to evaluate the bottom corrosion severity and interpreter the corrosion source, further to make the on-site testing more reliable and reduce the risk.

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{normalf}_{normalb} = \frac{1}{{πD}_{max}} \sqrt{\frac{{3γp}_{normalb}}{{normalρ}_{0}}}

…”

Section: Resultsmentioning

confidence: 99%

Cluster analysis of acoustic emission signals in pitting corrosion of low carbon steel

Li²,

et al. 2015

Materialwissenschaft Werkst

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“…One of the important physical properties of bubbles is their size, which can be measured under various conditions and descriptions along with the gas hold-up and velocity [117]. Several methods are available for the detection of bubble size, including optical methods such as high-speed photography [118,119], image analysis [120], and electrical impedance [121,122], as well as acoustical methods [108,[123][124][125]. Table 1 presents the generic methods applied to measure CB sizes in froth flotation, and detailed information regarding the modern techniques can be found elsewhere [126].…”

Section: Bubble Size-measurement Techniquesmentioning

confidence: 99%

Recent Developments in Generation, Detection and Application of Nanobubbles in Flotation

Nazari

Hassanzadeh

et al. 2022

Minerals

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This paper reviews recent developments in the fundamental understating of ultrafine (nano) bubbles (NBs) and presents technological advances and reagent types used for their generation in flotation. The generation of NBs using various approaches including ultrasonication, solvent exchange, temperature change, hydrodynamic cavitation, and electrolysis was assessed. Most importantly, restrictions and opportunities with respect to the detection of NBs were comprehensively reviewed, focusing on various characterization techniques such as the laser particle size analyzer (LPSA), nanoparticle tracking (NTA), dynamic light scattering (DLS), zeta-phase light scattering (ZPALS), and zeta sizer. As a key feature, types and possible mechanisms of surfactants applied to stabilize NBs were also explored. Furthermore, flotation-assisted nano-bubbles was reported as an efficient method for recovering minerals, with a special focus on flotation kinetics. It was found that most researchers reported the existence and formation of NBs by different techniques, but there is not enough information on an accurate measurement of their size distribution and their commonly used reagents. It was also recognized that a suitable method for generating NBs, at a high rate and with a low cost, remains a technical challenge in flotation. The application of hydrodynamic cavitation based on a venturi tube and using the LPSA and NTA in laboratory scales were identified as the most predominant approaches for the generation and detection of NBs, respectively. In this regard, neither pilot- nor industrial-scale case studies were found in the literature; they were only highlighted as future works. Although the NB-stabilizing effects of electrolytes have been well-explored, the mechanisms related to surfactants remain the issue of further investigation. The effectiveness of the NB-assisted flotation processes has been mostly addressed for single minerals, and only a few works have been reported for bulk materials. Finally, we believe that the current review paves the way for an appropriate selection of generating and detecting ultrafine bubbles and shines the light on a profound understanding of its effectiveness.

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“…This hydrodynamic state can only meet the separation requirement of certain floatable particles, and cannot contribute to the separation of minerals with large changes in floatability. New designs of flotation column, including Jameson column and cyclonic‐static microbubble flotation column (FCSMC), have been implemented to provide a more efficient mineralization method 25,26 . A main component in Jameson column is a downcomer wherein a swarm of bubbles are formed and collide with particles to generate bubble‐particle aggregates in a high‐shear region surrounding a jet 26 .…”

Section: Introductionmentioning

confidence: 99%

“…New designs of flotation column, including Jameson column and cyclonic‐static microbubble flotation column (FCSMC), have been implemented to provide a more efficient mineralization method 25,26 . A main component in Jameson column is a downcomer wherein a swarm of bubbles are formed and collide with particles to generate bubble‐particle aggregates in a high‐shear region surrounding a jet 26 . These aggregates are discharged into the column and rise to form a foam layer 27 .…”

Section: Introductionmentioning

confidence: 99%

Recent advances in computational fluid dynamics simulation of flotation: a review

Wang

Yan

et al. 2021

Asia-Pacific J Chem Eng

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Flotation process is a multi‐phase and multi‐scale complex flow system, in which hydrodynamics plays an indispensable role. In recent years, computational fluid dynamics (CFD) numerical simulation has gradually become a powerful tool for studying flotation. In this review, the theories of CFD numerical simulation in flotation research were reviewed, involving various turbulence models and multi‐phase flow simulation approaches. An attempt has been made to analyze and discuss the characteristics and applicability of different turbulence models and multi‐phase flow simulation approaches in flotation researches in detail. The CFD simulation of two commonly used flotation devices, that is, mechanically agitated flotation machine and flotation column, has been reviewed in detail. The detailed principles, operation, and hydrodynamic of flotation devices were discussed from the viewpoint of CFD. The advances made in CFD simulation for studying flotation process, including particle suspension, bubble dispersion, particle–bubble collision, attachment, and detachment subprocesses have been critically analyzed. Focused analysis was given on the influence mechanism of turbulence on the particle–bubble interactions. Finally, the gaps in the available literature are discussed and potential research directions are also proposed.

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An acoustic technique for measurement of bubble solids mass loading: (b) Monitoring of Jameson cell flotation performance by passive acoustic emissions

Cited by 9 publications

References 18 publications

Cluster analysis of acoustic emission signals in pitting corrosion of low carbon steel

Cluster analysis of acoustic emission signals in pitting corrosion of low carbon steel

Recent Developments in Generation, Detection and Application of Nanobubbles in Flotation

Recent advances in computational fluid dynamics simulation of flotation: a review

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