Picobubble Enhanced Fine Coal Flotation

Tao, Youjun; Liu, Jiongtian; Yu, Samuel; Tao, D.

doi:10.1080/01496390600957249

Cited by 41 publications

(11 citation statements)

References 14 publications

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“…This phenomenon is in good agreement with observations for ASH [11,12,14]. Furthermore, the use of the Venturi principle in the flotation column can enhanced hydrophobic particle aggregation and bubble-particle collision probability in the occurrence of nanobubbles produced by hydrodynamic cavitation [18,36,37]. Nanobubbles were more preferably generated on hydrophobic particle surface rather than on hydrophilic particle surface [17].…”

Section: Rougher Flotationsupporting

confidence: 78%

“…The bubble generator used in the flotation column, taking advantage of the Venturi principle, is the most widely used hydrodynamic cavitation device [17]. The generation of nanobubbles by hydrodynamic cavitation increases the probability of collision and attachment and decreases the probability of detachment compared with conventional-size bubbles [18]. In other words, cyclonic microbubble flotation column can extend the lower particle size limits for effective flotation due to the combination of nanobubbles and centrifugal force separation [11,19].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces

Zhang

Peng

et al. 2018

Minerals

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Graphite ore collected from Hunan province, south China was characterized by chemical analysis, X-ray diffraction, and optical microscopy. Rougher and multi-stage flotation tests using a mechanical flotation cell and a flotation column containing an additional centrifugal force field were carried out to promote its grade and economic value. In rougher flotation, both the mechanical flotation cell and flotation column reduced the ash content of the graphite ore from 15.43% to 10.8%, while the yield of the flotation column (91.41%) was much higher than that of the mechanical flotation cell (50%). In the presence of hydrophobic graphite, the seriously entrained gangue restricted further improvement in the quality and economic value of the graphite ore. Therefore, multi-stage flotation circuits were employed to diminish this entrainment. Multi-stage flotation circuits using the two flotation devices further decreased the ash content of the graphite ore to~8%, while the yield when using the flotation column was much higher than that obtained from the mechanical flotation cell employed. On the other hand, the ash removal efficiency of the flotation column was 3.82-fold higher than that observed for the mechanical flotation cell. The Cleaner 3 flotation circuit using the flotation column decreased the ash content in graphite from 15.43% to 7.97% with a yield of 77.53%.

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Section: Rougher Flotationsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces

Zhang

Peng

et al. 2018

Minerals

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“…Such a unique feature allows the design of a robust flotation system for a wide range of feed particle sizes. Enhanced flotation separation efficiency with a similar, or even a better concentrate grade, in addition to increased recovery and flotation kinetics; As shown in Figure , cavitation tube spargers gave the highest minerals and bitumen recovery, virtually without reducing its froth quality or separation efficiency. Cavitation tubes can also be used to pre‐aerate the feed, by pumping the feed to a flotation column or any other type of flotation cells via cavitation tubes, for increased unit flotation recovery and reduced reagent consumptions Cavitation generated nanobubbles have been successfully tested and/or applied to commercial operations to enhance the flotation recovery of different types of ores and materials such as oxide minerals, industrial minerals, sulphide minerals, coal, oil sands, etc …”

Section: Generation Of Micro‐nanobubblesmentioning

confidence: 99%

“…[65,71,112,121,122] • Cavitation generated nanobubbles have been successfully tested and/or applied to commercial operations to enhance the flotation recovery of different types of ores and materials such as oxide minerals, industrial minerals, sulphide minerals, coal, oil sands, etc. [112,113,[123][124][125][126][127][128][129] Accompanied by the success of its application to industrial operations, fundamental studies have also been carried out in different research groups. Laboratory research has revealed that cavitation-generated nanobubbles have the following distinguishing features:…”

Section: Nanobubble Generation By Hydrodynamic Cavitationmentioning

confidence: 99%

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

Zhou¹,

HaiHong²,

Chow³

et al. 2019

Can J Chem Eng

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Bitumen flotation hydrodynamics in water‐based oil sand extraction is critically reviewed by comparing aeration of oil sand slurries with mineral flotation. The role of the two‐stage particle‐bubble attachment model in flotation is emphasized as a means to accelerate bitumen flotation recovery. It involves the generation of micro/nanobubbles and their frosting on hydrophobic bitumen droplets, followed by their attachment to a flotation‐size bubble via its coalescence with the nanobubbles frosted on the bitumen. Nanobubble generation by hydrodynamic cavitation demonstrates that the size of nanobubbles can be reduced, and the number of nanobubbles increased by fast liquid flow, intensified agitation, high dissolved gas content and surfactant concentration. The mechanism of pre‐existing gas nuclei in enhancing nanobubble generation by cavitation is utilized to produce a large volume of stabilized nanobubbles for practical flotation, by continuously recirculating the stream through a gas saturation tank or a cavitation tube. The aeration of oil sand slurries in hydrotransport pipelines is analyzed based on its similarity to dissolved air flotation. Bitumen extraction recovery increased significantly with the presence of nanobubbles in the system. The role of improved flotation hydrodynamics in bitumen recovery is briefly discussed in terms of the Suncor operation using flotation columns to process oil sand middling streams. Future research should be directed at understanding bitumen flotation kinetics, optimizing size ranges of nanobubbles for maximized flotation recovery, minimizing wearing of cavitation tubes in industrial operations, and intensifying the role of in‐situ nanobubble nucleation on hydrophobic particles/bitumen droplets in flotation, especially for bitumen extraction from underperforming oil sands.

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“…A fundamental difference between both columns is the fact that the bubble generator of the 6" column is a cavitation tube, while the bubble generator of the 4" column is a porous tube. Hydrodynamic cavitation to generate bubbles has been use to enhanced the flotation of fine and ultrafine particles [17][18][19]. Tao et al [17] evaluated the effect of picobubble injection produced by the hydrodynamic cavitation principle in association with the conventional sized bubbles produced by a static mixer on the flotation response of fine coal particles.…”

Section: Flotation Studiesmentioning

confidence: 99%

A Comparative Study of Different Columns Sizes for Ultrafine Apatite Flotation

Matiolo

Couto

Teixeira³

et al. 2019

Minerals

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The desliming operation to discharge ultrafine particles less than 20 µm prior to concentration by flotation is a common practice in phosphate ores beneficiation plants. The first industrial application for the beneficiation of the phosphate material with particle sizes <44 µm in Brazil was in the Araxá plant concentrator in the beginning of the 1980s. This work shows the comparative flotation results with two different phosphate slime samples (<40 µm) obtained from the Copebras (CMOC International) industrial plant located in Catalão (Goiás state, Brazil), considering a circuit with rougher/cleaner configuration with different columns sizes, as follows: Circuit 1 (rougher—4” diameter column; cleaner—2” diameter column) and circuit 2 (rougher—6” diameter column; cleaner 4” column). The results indicate that better flotation apatite recovery results were achieved for the circuit with higher size columns (6” and 4”). The results can be explained by the application of a cavitation tube in the rougher stage in the 6” column. The improved flotation performance can be attributed to increased probabilities of collision and attachment and the reduced probability of detachment by the small size bubbles generated by the cavitation tube in comparison with the bubbles produced by the porous tube of the 4” column flotation.

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Picobubble Enhanced Fine Coal Flotation

Cited by 41 publications

References 14 publications

Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces

Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

A Comparative Study of Different Columns Sizes for Ultrafine Apatite Flotation

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