Impurity iron separation from molten secondary aluminum by pulsed electric current

Sun, Yi; Huang, Xuexiang; Liu, Changhao; Zhou, Miaolei; Zhang, Xinfang

doi:10.1016/j.jallcom.2022.167903

Cited by 9 publications

(5 citation statements)

References 40 publications

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“…As a result, Europe's annual CO 2 emission may reduce up to 39 million tonnes [3]. It has been estimated that the total energy consumption in the aluminium recycling process is 95% lower than that required in primary aluminium production by the Bayer process (caustic digestion-gibbsite precipitation-calcination) followed by electrolytic reduction up to a purity of 99.5-99.8% (Hall-Héroult process) [4,5]. Further refining of aluminium can be performed either using the Hoopes process (purity ~99.98%) or the Gadeau process (purity ~99.99%) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Waste Pharmaceutical Blister Package Aluminium in Sulphuric Acid Media

Shukla

Chernyaev

Halli

et al. 2023

Metals

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In this study, the leaching behaviour of aluminium from waste pharmaceutical blister packages (WPBs) is investigated in sulphuric acid media to build future strategies for aluminium recycling from this non-recycled waste fraction. The results suggest that in hydrometallurgical recycling, passivation of aluminium during leaching can be mitigated in dilute sulphuric acid solutions (0.25 M), at high temperatures (60–80 °C) and specifically with H2O2 addition. With this system, 100% extraction was achieved within five hours under optimized conditions (H2SO4 = 0.25 M, T = 80 °C, H2O2 = 1.25 vol.%). The leaching mechanism is suggested to be based on electrochemical dissolution of metallic aluminium oxidized by H+ or H2O2, followed by fast passivation by Al2O3 and consequent chemical dissolution of Al2O3 at slower kinetics. The calculated activation energy (~69 kJ/mol) suggests that the leaching reaction is controlled by the chemical or electrochemical reaction step rather than diffusion. By WPB leaching, an aluminium sulphate solution could be obtained, suitable for further aluminium sulphate crystallization. This may provide a potential route for the valorisation of aluminium from a currently overlooked waste fraction of pharmaceutical blister packages.

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Section: Introductionmentioning

confidence: 99%

Leaching of Waste Pharmaceutical Blister Package Aluminium in Sulphuric Acid Media

Shukla

Chernyaev

Halli

et al. 2023

Metals

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“…Наличие таких частиц в материале позволяет обратимо изменять его физико-механические свойства под действием внешнего магнитного поля [4]. Возвращаясь к алюминиевым материалам, следует подчеркнуть, что железосодержащие зоны могут образовываться на этапе переработки вторичного алюминия [8]. Известно, что во вторичном алюминии содержится много примесных элементов, таких как Fe, Si, Mg и др.…”

Section: Introductionunclassified

“…Из-за низкой растворимости в твердом алюминии атомов Fe, они имеют тенденцию при кристаллизации соединяться с алюминием в виде включений, представляющих собой богатые Fe интерметаллические соединения. Такие включения существенно влияют на механические и литейные свойства алюминиевого сплава [8]. Влияние различной формы включений на процессы ползучести и усталости материала были исследованы и в работе [9].…”

Section: Introductionunclassified

Влияние Внешних Воздействий На Ползучесть Алюминиевых Сплавов С Микроскопическими Включениями При Комнатных Температурах

Friha¹,

Пшонкин²,

Скворцов³

et al. 2023

Физика Твердого Тела

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It is devoted to the experimental study of the creep of an aluminum alloy containing microscopic inclusions. It was found that preliminary electric ignition (j<3· 106 A/m2) of the material leads to an increase in the creep of the samples. The reasons for the observed changes are associated by the authors with the formation of local areas of high mechanical stresses near the interface of the inclusion - matrix interface. The assessment of the level of emerging local thermoelastic stresses in aluminum deltaT ~ 35 MPa, as well as the characteristic size of such areas (~ 2 µm). The observed increase in creep is determined by the resultant effect of residual stresses and stresses of thermal nature, which contributes to the creation of additional local sources of deformation in the interfacial regions. Local stress concentrators lead to a local increase in the number of mobile dislocations, which is the main reason for the change in the mechanical properties of the aluminum alloy under consideration with microscopic inclusions.

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“…The presence of such particles in the material allows reversibly changing its physico-mechanical properties under the effect of external magnetic field [4]. Returning to aluminum materials, it is worth emphasizing that iron-containing zones can be formed at the stage of secondary aluminum processing [8]. It is known that the secondary aluminum contains many impurity elements, such as Fe, Si, Mg, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the low solubility of Fe atoms in the solid aluminum, these atoms tend to bind with aluminum during crystallization in the form of inclusions that are intermetallic compounds rich in Fe. Such inclusions have a significant effect on mechanical and casting properties of aluminum alloys [8]. The effects of different shape of inclusions on the creep and fatigue processes in materials have been investigated in [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of external influences on the creep of aluminum alloys with microscopic inclusions at room temperatures

Friha

Pshonkin

Skvortsov

et al. 2023

Physics of the Solid State

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It is devoted to the experimental study of the creep of an aluminum alloy containing microscopic inclusions. It was found that preliminary electric ignition (j<3· 106 A/m2) of the material leads to an increase in the creep of the samples. The reasons for the observed changes are associated by the authors with the formation of local areas of high mechanical stresses near the interface of the inclusion --- matrix interface. The assessment of the level of emerging local thermoelastic stresses in aluminum deltaT~ 35 MPa, as well as the characteristic size of such areas (~ 2 μm). The observed increase in creep is determined by the resultant effect of residual stresses and stresses of thermal nature, which contributes to the creation of additional local sources of deformation in the interfacial regions. Local stress concentrators lead to a local increase in the number of mobile dislocations, which is the main reason for the change in the mechanical properties of the aluminum alloy under consideration with microscopic inclusions. Keywords: Aluminum alloys, plastic deformation, creep, phase interface, dislocation dynamics.

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Impurity iron separation from molten secondary aluminum by pulsed electric current

Cited by 9 publications

References 40 publications

Leaching of Waste Pharmaceutical Blister Package Aluminium in Sulphuric Acid Media

Leaching of Waste Pharmaceutical Blister Package Aluminium in Sulphuric Acid Media

Влияние Внешних Воздействий На Ползучесть Алюминиевых Сплавов С Микроскопическими Включениями При Комнатных Температурах

Influence of external influences on the creep of aluminum alloys with microscopic inclusions at room temperatures

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