Recovery of Zinc from Zn–Al–Fe Melt by Super-gravity Separation

Wang, Zhe; Gao, Jintao; Meng, Long; Shi, Anjun; Guo, Zhancheng

doi:10.2355/isijinternational.isijint-2017-561

Cited by 15 publications

(6 citation statements)

References 15 publications

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“…Furthermore, the supergravity technique has been proved to be useful for the fabrication of graded materials based on the density difference [12][13][14], which has a simple mechanism and simple experimental operations, compared with the aforementioned techniques. This method has been successfully used in the metallurgy of the impurity separation and elements concentration [15][16][17][18][19], but its application in high-entropy alloys is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity

Wang

Guo

et al. 2018

Sci. China Mater.

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Investigating the microstructures and properties of gradient materials has been regarded as a promising way to accelerate the identification of optimal compositions for applications. Herein, a supergravity method is applied to prepare the graded entropic alloys Al-Zn-Li-Mg-Cu. Through carefully optimizing the experimental conditions, the graded microstructures and hardness values appear after the supergravity technique. The morphology of the alloy significantly changes from the bulk intermetallics to eutectic structures along the supergravity force direction, which results from the crushed and graded aluminum oxide combined with the extremelystrong force. The results show that with this supergravity method, a performance-enhanced alloy can potentially be achieved through the centrifugation in a short time span and thus it paves the way for designing and synthesizing entropic alloys with intriguing properties.

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Section: Introductionmentioning

confidence: 99%

Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity

Wang

Guo

et al. 2018

Sci. China Mater.

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“…Assuming that oxide and nitride inclusions are spherical, their motion in the viscous melt under the action of a centrifugal force can be described by Stokes's law (Eq. (3)): 20) d d where dr/dt, ρ L , ρ P , ω, r, d, η, and N are the moving velocity, liquid density, particle density, angular velocity, distance of the particle from the centrifugal axis, particle diameter, molten metal viscosity, and centrifuge rotation speed, respectively.…”

Section: Discussionmentioning

confidence: 99%

Supergravity-Induced Separation of Oxide and Nitride Inclusions from Inconel 718 Superalloy Melt

et al. 2020

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Herein, a method of supergravity-enhanced separation was used to remove oxide and nitride inclusions from Inconel 718 superalloy melt, with elucidating the inclusion removal behavior by varying the gravity coefficients (G) and separation times (t) used for melt treatment. Under supergravity conditions, inclusions concentrated at the sample top and are almost absent at the sample bottom. Moreover, the inclusion number density and average size showed a gradient distribution along the supergravity direction, and the steepness of this gradient rapidly increased with increasing G and t. The experimentally determined inclusion movement velocities agreed well with those calculated using Stokes's law at G ≤ 210 and t ≤ 10 min. At G = 210 and t = 10 min, the total oxygen and nitrogen contents of the sample decreased from 34.4 to 8.7 ppm and 133.4 to 34.1 ppm, respectively, corresponding to oxide and nitride removal efficiencies of 74.7% and 74.4%, respectively.

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“…Hard zinc, which can be identified as surface dross (mainly Fe 2 Al 5 Zn x ) and bottom dross (mainly δ 1 (FeZn 7 ) or ζ (FeZn 13 ) phase), hinders the galvanizing process and requires periodic removal-the surface dross is skimmed off by labor or machine at intervals, while the bottom dross can be removed when the operation is shut down. One novel efficient method called the supergravity method for recovering zinc from galvanizing dross has been proposed by the University of Science and Technology Beijing in China [70].…”

Section: Zinc Production From Secondary Resourcesmentioning

confidence: 99%

Evaluation and Current State of Primary and Secondary Zinc Production—A Review

Kania

Saternus

2023

Applied Sciences

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This article presents the history of zinc, its production and demand. The quantity of zinc production, both primary zinc from ores and concentrates, and secondary zinc from scrap and zinc-rich waste, was discussed. A comprehensive economic analysis covers zinc prices in the years 1960–2021. The basic methods of obtaining zinc from ores, including pyrometallurgical (Imperial Smelting Process ISP, Kivcet, Ausmelt) and hydrometallurgical (roasting–leaching–electrowinning RLE, atmospheric direct leaching ADL, Engitec Zinc Extraction EZINEX, zinc pressure leach) and their short characteristics, are presented. The global zinc market and the main areas of its application were analyzed. Technologies used for the recovery of zinc from scrap are discussed along with their characteristics. Galvanized steel is the main source of secondary zinc, both in the galvanizing process and in the remelting of galvanized steel. It can be easily recycled with other scrap steel in the electric arc furnace (EAF) for steel production. Currently, with high volatility in the price of zinc, as well as its natural resources in the earth’s crust, recycling is an important activity, despite the fact that zinc concentrates have a relatively constant chemical composition, while the resulting zinc waste contains zinc in varying amounts.

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Recovery of Zinc from Zn–Al–Fe Melt by Super-gravity Separation

Cited by 15 publications

References 15 publications

Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity

Graded microstructures of Al-Li-Mg-Zn-Cu entropic alloys under supergravity

Supergravity-Induced Separation of Oxide and Nitride Inclusions from Inconel 718 Superalloy Melt

Evaluation and Current State of Primary and Secondary Zinc Production—A Review

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