Effect of Hydrodynamic Cavitation Assistance on Different Stages of Coal Flotation

Han, Hua; Liu, An; Wang, Huaifa

doi:10.3390/min10030221

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…[1] The NBs act as secondary collectors to the fine particles increasing their hydrophobicity and forming aggregates; therefore, increasing the buoyancy and chance to reach the froth zone . [3,11,13,21] The hydrophilic particles that get entrained by the NBs to the froth zone evident from the increased water recovery and remain entrapped in the stabilized froth (due to the additional frother), thus reporting to the concentrate. Thus the increased entrainment (from the high water recovery and small particle size -low inertia) and entrapment in the froth zone due to the stable froth results in poor selectivity.…”

Section: Discussionmentioning

confidence: 99%

“…The essential outcome was that NB flotation could improve the recovery of ultrafine, and in some cases, coarse particles (Table 1) . [3,6,[9][10][11][12][13][14] It was recently also illustrated that NB generation in the presence of conventional flotation reagents, besides improvement in the flotation recovery, could reduce the overall chemical consumption through the process [15] (Table 1). However, these investigations mostly assessed NB flotation's effect on a narrow size range (ultrafine or coarse range).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Chipakwe

Sand

Chelgani

2021

Separation Science and Technology

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A considerable difference exists between the flotation separation of artificial minerals and real lowgrade ores processing where selectivity would be the main issue. Nanobubble-assisted (NB) flotation investigations have been mostly examined with pure materials and a narrow particle size range, less on complex sulfide ores. This study considered NB flotation for processing complex Pb-Cu-Zn sulfide ore in two different size ranges and various conditions to assess the process readiness. Metallurgical NB flotation responses (recovery, grade, kinetics, and selectivity index) were determined, compared to conventional tests. Outcomes revealed that an inclusive size fraction (−150 µm) could result in a higher selective process than a fine fraction (-38 µm). In contrast, mass recovery and kinetics were higher for the fine one. In general, adding NBs compared to the conventional (CB) could improve the flotation metallurgical responses; however, the way NBs were generated would be key. NBs generated in the presence of frother (NBF) could produce higher mass and water recoveries while decreasing selectivity. In general, different setups' flotation products showed the following selectivity order of Pb-Cu sulfides: NB>NBF>CB. These results opened a new approach for considering different NB generation conditions when they are going to use in various flotation stages.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Chipakwe

Sand

Chelgani

2021

Separation Science and Technology

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“…Hydrocavitation's principle is to produce bubbles by diminishing the pressure to a certain critical value through a change in the flow rate of the flowing liquid causing a change in the pressure of the system. Hydrocavitation is popularly used in industrial flotation for NBS flotation systems because it is easy to control in industry by adjusting geometric conditions, velocity and other parameters, and it is easy to operate, and different sizes of NBS can be generated by containing the liquid flow rate (Oliveira et al, 2018;Han et al, 2020). , FAN et al (2010a used hydrocavitation to prepare NBS in a homemade NBS generation system to study its effect on froth flotation and found that dissolved oxygen and carbon dioxide gases in water enhanced the NBS generation process.…”

Section: Preparation and Properties Of Nbsmentioning

confidence: 99%

Current status of research on nanobubbles in particle flotation

Chen,

Cheng

2024

Physicochem. Probl. Miner. Process.

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Froth flotation, as one of the most widely used separation approaches in mineral processing, is commonly used to recover valuable components from minerals. However, maintaining high flotation efficiencies is a serious challenge for conventional froth flotation in the face of decreasing particle size of the minerals to be sorted. To date, there have been plenty of reports on the software of nano-bubbles (NBS) in flotation, and the experimental consequences show that nano-bubbles' introduction has given rise to improvement's different grades in the recovery of varieties of minerals, which highlights the great potential of nano-bubbles for mineral flotation. Nanobubbles have smaller bubble radii and unusually high stability compared to conventional flotation bubbles, and their related behavior in flotation has been a hot research topic. This paper reviews some of the methods of preparing nanobubbles, equipment techniques for characterizing nanobubbles, factors affecting their stability, and some of the popular doctrines. In particular, the reinforcing mechanism of nanobubbles in the particle flotation process is discussed, first, the nanobubbles improve the electrostatic attractiveness with the particles by achieving the charge inversion while the nanobubbles that was adsorbed on the particles' surface will cover a share of the charge, which decreases the electrostatic repulsive force between the particles; and second, the nanobubbles can act as a bridge between the surfaces of the two particles, which advances the agglomeration between the particles. This review aims to be able to further advance the research related to the industrialization of nanobubbles.

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“…According to the results, flotation with single NBs was not effective due to their very low lifting power and poor buoyancy. [5,13,14,32,35,51,60,61,63,64,66,67,131,[133][134][135][136]148,150,153,154,201].…”

Section: Nb-assisted Flotationmentioning

confidence: 99%

“…In practice, the high energy consumption, installation inconvenience and maintenance difficulty encountered in ultrasonic and electrolysis methods have prevented them from being used in flotation [30]. Among these methods, hydrodynamic cavitation is considered the most promising method for large-scale mineral flotation applications due to its simple design and high throughput [31][32][33][34][35].…”

Section: Introductionmentioning

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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Effect of Hydrodynamic Cavitation Assistance on Different Stages of Coal Flotation

Cited by 10 publications

References 21 publications

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Current status of research on nanobubbles in particle flotation

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

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