Enhancement of coal flotation using impact flow conditioning pulp

Wang, Hainan; Yang, Wenqing; Li, Danlong; Zhang, Chunquan; Yan, Xiang-Ping; Wang, Lijun; Zhang, Haijun

doi:10.1016/j.jclepro.2020.122124

Cited by 33 publications

(19 citation statements)

References 42 publications

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“…When kerosene was added during attrition (III), the mass pull increased to 49.2% and graphite recovery increased to 98.1%. Under such conditions, the energy input through the attrition pre-treatment improved the emulsification of the oily collector, likely promoting the reagent adsorption and subsequently improving particle-bubble attachment [44][45][46]. It was observed in Figure 4 that adding kerosene during attrition (III) increased as did the recovery of Co, Ni, and Mn compared to (II).…”

Section: Flotation Trends Of Spent Black Massmentioning

confidence: 96%

Improving Separation Efficiency in End-of-Life Lithium-Ion Batteries Flotation Using Attrition Pre-Treatment

et al. 2022

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The comminution of spent lithium-ion batteries (LIBs) produces a powder containing the active cell components, commonly referred to as “black mass.” Recently, froth flotation has been proposed to treat the fine fraction of black mass (<100 µm) as a method to separate anodic graphite particles from cathodic lithium metal oxides (LMOs). So far, pyrolysis has been considered as an effective treatment to remove organic binders in the black mass in preparation for flotation separation. In this work, the flotation performance of a pyrolyzed black mass obtained from an industrial recycling plant was improved by adding a pre-treatment step consisting of mechanical attrition with and without kerosene addition. The LMO recovery in the underflow product increased from 70% to 85% and the graphite recovery remained similar, around 86% recovery in the overflow product. To understand the flotation behavior, the spent black mass from pyrolyzed LIBs was compared to a model black mass, comprising fully liberated LMOs and graphite particles. In addition, ultrafine hydrophilic particles were added to the flotation feed as an entrainment tracer, showing that the LMO recovery in overflow products is a combination of entrainment and true flotation mechanisms. This study highlights that adding kerosene during attrition enhances the emulsification of kerosene, simultaneously increasing its (partial) spread on the LMOs, graphite, and residual binder, with a subsequent reduction in selectivity.

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Section: Flotation Trends Of Spent Black Massmentioning

confidence: 96%

Improving Separation Efficiency in End-of-Life Lithium-Ion Batteries Flotation Using Attrition Pre-Treatment

et al. 2022

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“…The separation of fine coal has become a severe challenge for the coal industry. 5 , 6 Froth flotation is widely used for processing fine coal, utilizing the difference between the surface hydrophobicities of particles to separate coal from gangue. 7 − 9 In the flotation process, hydrophobic particles are expected to attach to the bubble surface and float to form a froth layer, whereas hydrophilic particles tend to sink to the bottom of the cell to form tailings.…”

Section: Introductionmentioning

confidence: 99%

“…The proportion of fine coal in the raw coal significantly increases with the high mechanization of coal mining technology. The separation of fine coal has become a severe challenge for the coal industry. , Froth flotation is widely used for processing fine coal, utilizing the difference between the surface hydrophobicities of particles to separate coal from gangue. − In the flotation process, hydrophobic particles are expected to attach to the bubble surface and float to form a froth layer, whereas hydrophilic particles tend to sink to the bottom of the cell to form tailings. It has been reported that the annual output of these coal flotation tailings reaches up to 100 million tons .…”

Section: Introductionmentioning

confidence: 99%

Associations of Gangue Minerals in Coal Flotation Tailing and Their Transportation Behaviors in the Flotation Process

2022

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The mass production of flotation tailings has become a serious risk to the environment. Re-concentration of tailings is one of the best ways to solve this problem, which requires a better understanding of flotation tailings. In the present work, flotation kinetics, timed-release flotation, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), and solid-state nuclear magnetic resonance (SSNMR) were used to analyze the properties of flotation tailings with different particle sizes and densities, the occurrence and binding state of gangue minerals in tailing, and the transportation behaviors in the re-flotation process. Flotation results showed that the flotation yield exhibited little change with the extension of flotation time, while the ash content of the froth concentrates increased. An increase of the flotation time could reduce the ash content of the obtained product. The characterization results confirmed that the main gangue minerals in the tailings were kaolinite and quartz. With the decrease of particle size or the increase of floating and sinking density, the contents of kaolinite and quartz increased. However, due to the different dissemination characteristics of kaolinite and quartz in the tailings, the distributions of kaolinite and quartz in the different particle sizes and densities of tailing had differences. Although both kaolinite and quartz could exist as monomers, kaolinite was more easily associated with coal. Based on the above cognition, a new flotation method is proposed for coal flotation tailing. A part of the concentrates in the early stage of flotation should be scraped out quickly. Then, the concentrates obtained in the later stage of flotation are collected and merged into the concentrates obtained during the early stage of flotation, while the secondary tailing is directly pumped into the raw feed system.

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“…The flotation process involves three distinct sub‐processes, that is, collision, attachment, and detachment 4,5 . Sometimes, the pulp conditioning process is also considered as a prelude to the flotation process to enhance the difference in the surface hydrophobicity of the minerals 6–8 . Process intensification of the flotation is of great significance to improve flotation efficiency and reduce energy consumption, and it can be achieved by the development of devices and the optimization of operating parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Appropriate collector type and dosage are conducive to enhancing the adsorption of the collector on the particle surface, thereby improving the hydrophobicity 29,30 . Pulp conditioning can provide sufficient energy and time to promote the mixing of the collector and pulp, and the mixing efficiency can be improved by adjusting the conditioning intensity and time 6,7 . The frother is added to generate the stable bubbles with a suitable size distribution.…”

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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Enhancement of coal flotation using impact flow conditioning pulp

Cited by 33 publications

References 42 publications

Improving Separation Efficiency in End-of-Life Lithium-Ion Batteries Flotation Using Attrition Pre-Treatment

Improving Separation Efficiency in End-of-Life Lithium-Ion Batteries Flotation Using Attrition Pre-Treatment

Associations of Gangue Minerals in Coal Flotation Tailing and Their Transportation Behaviors in the Flotation Process

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

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