Comparison of Agglomeration Behavior of Fine Particles in Liquid among Various Mixing Operations

Sumitomo, Syunsuke; Yoshitomi, Kota; Uddin, Md. Azhar; Kato, Yoshiei

doi:10.2355/isijinternational.isijint-2017-190

Cited by 9 publications

(16 citation statements)

References 29 publications

(26 reference statements)

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“…Sumitomo et al 32) imagined that the agglomerated particles adhering to a bubble surface are partially broken up at the liquid free surface during bubble bursting, as shown schematically in Fig. 2, and developed a mathematical breakup model for agglomerated particles with a single primary size (monodisperse particles).…”

Section: Breakup Term Of Agglomerated Particlesmentioning

confidence: 99%

“…31) The turbulent energy dissipation rate ( = energy input rate) was associated with the agglomeration rate. Sumitomo et al 32) carried out agglomeration experiments with monodisperse polymethylmethacrylate (PMMA) particles and reported that the agglomeration rate in a gas stirring process was less than that under impeller stirring at the same energy input rate. They explained this difference by noting that part of the agglomerated particles adhering to the floating bubble surface broke up during bubble bursting at the liquid free surface.…”

Section: Introductionmentioning

confidence: 99%

“…Targeting a comparison of the PMMA agglomeration behavior in impeller stirring and gas stirring processes, in the present study, agglomeration experiments were carried out with polydisperse particles as well as monodisperse ones. A combination model of the agglomeration and breakup behavior of PMMA particles with an initial size distribution was developed by combining the particles breakup term due to bubble bursting 32) and the PSG method, 24) and the validity of the numerical calculation method was demonstrated by comparing the numerical results with the experimental ones.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

et al. 2021

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Agglomeration, coalescence and flotation of non-metallic inclusions in steel melt are effective for obtaining "clean steel." In this study, the agglomeration and breakup behaviors of particles with a primary particle size distribution (hereinafter, polydisperse particles) in a liquid under impeller and gas stirring were compared by numerical calculations and model experiments. The particle-size-grouping (PSG) method in the numerical agglomeration model of particles was combined with a breakup term of agglomeration due to bubble bursting at the free surface. Polydisperse and monodisperse polymethylmethacrylate (PMMA) particles were used in the agglomeration experiments. The agglomeration rate of the polydisperse particles under impeller stirring was increased by an increasing energy input rate, whereas the agglomeration rate under gas stirring decreased under this condition due to the larger contribution of the breakup of agglomerated particles during bubble bursting in gas stirring. At the same energy input rate, agglomeration of polydisperse particles was larger under impeller stirring than under gas stirring. The agglomeration rate of polydisperse particles was larger than that of monodisperse particles under both impeller and gas stirring at the same energy input rate. The computational temporal changes in the total number of particles were in good agreement with the experimental results. This means that the difference in the agglomeration behaviors observed in impeller and gas stirring can be explained by the turbulent coagulation and subsequent agglomerated particle breakup in gas stirring. The computational temporal change in the number of each group approximately agreed with the experimental change in both impeller and gas stirring.

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Section: Breakup Term Of Agglomerated Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

et al. 2021

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“…The research papers [6][7][8][9] dials with the process of agglomeration as a common phenomenon in separation and pneumiclassification processes. As a result of using the Rumpf model [6] and related numerical simulations, it is proved that the mechanical properties of agglomerates depend on their structures.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It was proved that the acoustic agglomeration technology can be applied for removal of fine particles [7]. Comparison of agglomeration behavior of fine particles in during mixing is presented in the paper [8]. Finally, ways for experimental evaluation of chemical agglomeration of fine particles in gas-mechanical mixtures are presented in the research work [9].…”

Section: Literature Reviewmentioning

confidence: 99%

Solving the Nonstationary Problem of the Disperse Phase Concentration during the Pneumoclassification Process of Mechanical Mixtures

Pavlenko¹,

Yukhymenko²,

Lytvynenko³

et al. 2019

JES

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The article dials with studying of the gas-dispersed systems classification process in gravitation pneumoclassifiers of prismatic shape. The aim of the research is to determine operating parameters of the investigated process. Recent research is based on the previously developed mathematical model of hydrodynamics for a gasdispersed flow in a vertical channel with variable cross-section. As a development of this study, a physical model based on the process of kinetic removal from the mixture was used. This process is caused by the removal of fine particles from the weighed layer in the case of theirs low velocities in comparison with the average gas flow velocity. This model also considers the inertial effect due to the kinetic energy of fine particles removed from the surface of the weighted later. The first order linear nonhomogeneous partial differential equation describing the unsteady process of changing the dispersed phase concentration in the gas-mechanical mixture by channel height was solved by mathematical modeling using the combination of direct and inverse Laplace transforms. As a result, for the first time the general solution was obtained for for non-trivial boundary and initial conditions. This fact allowed developing the mathematical model of the nonstationary problem for the disperse phase concentration during the pneumoclassification process of mechanical mixtures in pneumoclassifiers. The model allows determining the concentration of fine fraction of the gas-dispersed mixture by channel height in operating volume of the device, as well as evaluating time of the pneumoclassification process. Particularly, it was found that the dispersed phase concentration decreases by the height of the apparatus with respect to time. This fact proves the possibility of effective separation of components in gas-mechanical mixtures. Finally, the achieved results allow proposing the engineering technique for calculations of vertial-type gravitation pneumoclassifiers.

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Industrial Application of Bottom–Blown CO₂ in Basic Oxygen Furnace Steelmaking Process

Feng

Zhu

Liu

et al. 2021

steel research int.

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A significant amount of CO 2 is emitted and utilized in the production processes engaged by iron and steel enterprises. Herein, the feasibility and principles of CO 2 participation in the steelmaking process are analyzed, and an industrial examination of bottom-blown CO 2 smelting in a 120 t converter is performed; this serves to summarize and verify the metallurgical advantages of CO 2 participation in the converter steelmaking process. The injection of CO 2 improves the effects of dephosphorization and denitrification, reduces the end-point oxygen content of molten steel, diminishes the consumption of the slagging agent, and contributes to a reduction in production costs and improvement in product quality. This study analyzes two different recycling paths of CO 2 in iron and steel enterprises, providing a new mechanism for CO 2 emission reduction.

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Comparison of Agglomeration Behavior of Fine Particles in Liquid among Various Mixing Operations

Cited by 9 publications

References 29 publications

Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

Solving the Nonstationary Problem of the Disperse Phase Concentration during the Pneumoclassification Process of Mechanical Mixtures

Industrial Application of Bottom–Blown CO₂ in Basic Oxygen Furnace Steelmaking Process

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Comparison of Agglomeration Behavior of Fine Particles in Liquid among Various Mixing Operations

Cited by 9 publications

References 29 publications

Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid

Solving the Nonstationary Problem of the Disperse Phase Concentration during the Pneumoclassification Process of Mechanical Mixtures

Industrial Application of Bottom–Blown CO2 in Basic Oxygen Furnace Steelmaking Process

Contact Info

Product

Resources

About

Industrial Application of Bottom–Blown CO₂ in Basic Oxygen Furnace Steelmaking Process