Physical Modeling of the Impeller Construction Impact on the Aluminum Refining Process

Saternus, M.; Merder, T.

doi:10.3390/ma15020575

Cited by 10 publications

(16 citation statements)

References 20 publications

(31 reference statements)

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“…For refining reactors with a rotor, Oldshue [ 27 ] described four degrees of gas-bubble scattering in liquid metal: column flow, or the formation of geysers on the surface of the liquid; minimum dispersion; fine dispersion and uniform dispersion. After analyzing this research, one more case was added to these four schemes [ 28 ] during which turbulence and chain flow arose, which is a highly undesirable effect.…”

Section: Introductionmentioning

confidence: 99%

Using Physical Modeling to Optimize the Aluminium Refining Process

et al. 2022

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Concern for the environment and rational management of resources requires the development of recoverable methods of obtaining metallic materials. This also applies to the production of aluminium and its alloys. The quality requirements of the market drive aluminium producers to use effective refining methods, and one of the most commonly used is blowing an inert gas into liquid aluminium via a rotating impeller. The efficiency and cost of this treatment depends largely on the application of the correct ratios between the basic parameters of the process, which are the flow rate of the inert gas, the speed of the rotor and the duration of the process. Determining these ratios in production conditions is expensive and difficult. This article presents the results of research aimed at determining the optimal ratio of the inert gas flow rate to the rotary impeller speed, using physical modeling techniques for the rotor as used in industrial conditions. The tests were carried out for rotary impeller speeds from 150 to 550 rpm and gas flow rates of 12, 17 and 22 dm3/min. The research was carried out on a 1:1 scale physical model, and the results, in the form of visualization of the degree of gas-bubble dispersion, were assessed on the basis of the five typical dispersion patterns. The removal of oxygen from water was carried out analogously to the process of removing hydrogen from aluminium. The curves of the rate of oxygen removal from the model liquid were determined, showing the course of oxygen reduction during refining with the same inert gas flows and rotor speeds mentioned above.

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Section: Introductionmentioning

confidence: 99%

Using Physical Modeling to Optimize the Aluminium Refining Process

et al. 2022

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“…When the rotor rotates at high speed, the bubbles are broken up by the shear force acting on the surface of the rotor 20 . In highly stirred reactors, the behaviour and mechanism of gas bubbles as well as the hydrodynamic field are complicated 21 . The hydrodynamic field is characterized by turbulence and an uneven rate of energy dissipation and the presence of vortices moving in different directions 22 .…”

Section: Introductionmentioning

confidence: 99%

Assessment of refining efficiency during the refining cycle in a foundry degassing unit in industrial conditions

Socha,

Prášil,

Gryc

et al. 2024

Sci Rep

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The article focuses on the issue of improving the efficiency of a Foundry Degassing Unit (FDU) via operational testing of aluminium alloys during casting at MOTOR JIKOV Slévárna a.s.. As part of the research, the efficiency of the refining process in the FDU was assessed. The main emphasis was placed on determining the moment of the greatest decrease in the hydrogen content in the melt and whether it is possible to shorten the refining cycle. The values of the Dichte Index were determined, on the basis of which the degassing curve was plotted and the progress of the melt degassing was assessed. To ensure the required quality of castings, the maximum allowable value of the Dichte Index ranged from 3 to 4%. During the process, the temperature drop during the refining cycle was also determined. The total temperature drop from pouring the melt into the ladle to the end of refining ranged from 26 to 32 °C, which is within the acceptable limits of the foundry. Based on the knowledge resulting from the operational experiments, recommendations were formulated to optimize the refining technology at the FDU for the MOTOR JIKOV Slévárna a.s. foundry.

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“…A uniform distribution of gas bubbles in steel flow could be certainly beneficial to realize a good pump effect on molten steel. [35][36][37][38] Also, it can enhance the refining process that happens at bubble/steel interface, such as degassing, inclusion removal, decarburization, and so on. With the conventional radial gas-injection nozzle, force interactions of gas bubbleliquid steel are normally in vertical direction, which produce an approximately steady state gas-liquid plume region.…”

Section: Introductionmentioning

confidence: 99%

Study on Multiphase Flow Characteristics During RH Refining Process Affected by Nonradial Arrangement of Gas‐Blowing Nozzle

Wang

Zhou

et al. 2023

steel research int.

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Bath stirring, degassing, and decarburization in steel refining are strongly related to flow behaviors. The bubble plume produced in Ruhrstahl–Heraeus (RH) up‐snorkel plays an important role during refining, since it not only acts as a bubble pump, but also provides the reaction interface. Herein, it is aimed to form a new flow pattern in the up‐snorkel by using a nonradially arranged gas‐injection nozzle to enhance the 260 ton RH refining process. The results show that an upward spiral steel flow is produced, when nonradial gas‐injection nozzles are used in the up‐snorkel. Meanwhile, some bubbles moved toward the center region of the up‐snorkel, which may be caused by the centripetal effect in a rotational steel flow. This leads to a more uniform bubble distribution on the cross section of the snorkel, compared to that of the conventional case. Specifically, the circulation flow rate is increased by about 18.0%, and the mixing time are shortened by about 26.2% (criteria of ±5%), compared to that of the conventional case. In addition, the inclusion removal rate is increased by 0.5%, 4.8%, and 11.3% for the inclusion size of 20, 50, and 100 μm, respectively, compared to the conventional radial nozzle case.

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Physical Modeling of the Impeller Construction Impact on the Aluminum Refining Process

Cited by 10 publications

References 20 publications

Using Physical Modeling to Optimize the Aluminium Refining Process

Using Physical Modeling to Optimize the Aluminium Refining Process

Assessment of refining efficiency during the refining cycle in a foundry degassing unit in industrial conditions

Study on Multiphase Flow Characteristics During RH Refining Process Affected by Nonradial Arrangement of Gas‐Blowing Nozzle

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