Evaluating the Chemical Composition and the Molar Heat Capacities of a white Aluminum Dross

Abdulkadir, Abdurahim; Ajayi, Adesola O.; Hassan, Mohamed I.

doi:10.1016/j.egypro.2015.07.326

Cited by 44 publications

(8 citation statements)

References 8 publications

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“…This slag is highly contaminating and its reduction and disposal are two of the main challenges for the aluminum industry. 15 Also, it is composed of metals and non-metallic substances such as aluminum oxides and salts (Al 2 O 3 , NaCl, KCl, CaO, NaAlCl 4 , KA l Cl 4 , SiO 2 , MgO, among other substances). 12 Compared to the primary aluminum production process, the secondary aluminum production process has a 95% reduction in electricity consumption.…”

Section: Theoretical Foundationmentioning

confidence: 99%

Metal matrix production: Casting of recycled aluminum cans and incorporation of rice husk ash and magnesium

Holzschuh

Dörr

Moraes

et al. 2020

Journal of Composite Materials

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This research experimented with different aluminum can casting compositions from recycled materials. The objective was to analyze the casting yield and the resulting chemical compositions of the process. In the first process, 20 kg of aluminum cans was melted, resulting in a 10.2 kg ingot, which presented a 51% yield. In the second process, 10 kg of 6063 T6 aluminum was used and 10.2 kg of the first casting was added. This mixture produced an ingot of 50% recycled aluminum and 50% 6063 aluminum that weighed 18.23 kg. Similarly, a second ingot was produced, but with the addition of 4 wt% of rice husk ash and 2 wt% of magnesium. From each ingot, the samples were removed for chemical analyses, which consisted of tests of the samples that had the incorporation of rice husk ash in the molten aluminum. These analyses included scanning by electron microscopy, density analysis, Brinell hardness, and Charpy impact force tests. The results of the second ingot analysis showed superior characteristics in Si and Mg levels due to the addition of rice husk ash and magnesium. Also, the second ingot presented increased hardness as well as a reduction fragility and density.

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Section: Theoretical Foundationmentioning

confidence: 99%

Metal matrix production: Casting of recycled aluminum cans and incorporation of rice husk ash and magnesium

Holzschuh

Dörr

Moraes

et al. 2020

Journal of Composite Materials

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show abstract

“…The AHP method is constructed on the pairwise comparison to compute the weight of each criterion. The AHP permits experts to determine the significance of each criterion during comparing other criteria from 1 to 9, from "same importance" (1) to "completely more important" (9). Building a decision tree, decision-maker is permitted to first describe weights of the main criteria, and then decision-maker can describe the lower level subcriteria that exactly describe the tested multicriteria issue [28].…”

Section: Fahp Methodmentioning

confidence: 99%

“…Also, by recycling secondary aluminum, resources are saved, the need for landfill area could have been decreased, and the public opinion would be satisfied. A lot of dross is produced as a waste product during remelting or refining aluminum [9]. Although aluminum dross is a waste of current resources, in case of being landfilled without suitable treatment, it will lead to the secondary contaminants which would affect air, water, and soil [1].…”

Section: Literature Reviewmentioning

confidence: 99%

The Integrated Fuzzy AHP and Goal Programing Model Based on LCA Results for Industrial Waste Management by Using the Nearest Weighted Approximation of FN: Aluminum Industry in Arak, Iran

Zare

Nouri

Abdoli

et al. 2016

Advances in Materials Science and Engineering

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The worldwide recycled aluminum generation is increasing quickly thanks to the environmental considerations and continuous growing of use demands. Aluminum dross recycling, as the secondary aluminum process, has been always considered as a problematic issue in the world. The aim of this work is to propose a methodical and easy procedure for the proposed system selection as the MCDM problem. Here, an evaluation method, integrated FAHP, is presented to evaluate aluminum waste management systems. Therefore, we drive weights of each pair comparison matrix by the use of the goal programming (GP) model. The functional unit includes aluminum dross and aluminum scrap, which is defined as 1000 kilograms. The model is confirmed in the case of aluminum waste management in Arak. For the proposed integrated fuzzy AHP model, five alternatives are investigated. The results showed that, according to the selected attributes, the best waste management alternative is the one involving the primary aluminum ingot 99.5% including 200 kg and the secondary aluminum 98% (scrap) including 800 kg, and beneficiation activities are implemented, duplicate aluminum dross is recycled in the plant, and finally it is landfilled.

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“…EAD contains a certain amount of toxic and harmful substances including AlN and soluble fluoride salts. During the formation of EAD, the molten aluminum exposed to air reacts with nitrogen to generate a large amount of AlN, which is slowly hydrolyzed in contact with water or moist air at normal temperatures to generate toxic and pungent ammonia. , The amount of ammonia released from AlN hydrolysis in 10 g of EAD can reach about 1.09 L. Furthermore, the released ammonia can burn the skin and respiratory tract, and even cause severe pulmonary diseases . Ammonia also easily dissolves in water, causing serious water pollution.…”

Section: Introductionmentioning

confidence: 99%

A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

Liu

Zuo

et al. 2021

ACS Sustainable Chem. Eng.

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The continuous growth of the aluminum electrolysis industry has produced large amounts of electrolytic aluminum dross (EAD) as a waste product, which lacks proper recycling methods and poses serious environmental pollution risks. A short and clean process for recycling EAD is proposed involving the preparation of anode protection rings, which can effectively reduce the corrosion of anode steel stubs, improve the quality of molten aluminum, and return to aluminum reduction cells for recycling alumina and fluoride after being broken. The phase transition path of Al(OH) 3 in denitrified EAD by thermal decomposition was bayerite → boehmite → γ-Al 2 O 3 → α-Al 2 O 3 . The calcination temperature should be controlled at 600−800 °C for 2 h to obtain a higher content of activated γ-Al 2 O 3 . The average dissolution rate of denitrified EAD in the aluminum electrolyte was 7.33 times higher than that before denitrification treatment. After using EAD anode protection rings, the corrosion rate of anode steel stubs decreased by 67.7% on average. Furthermore, the iron and silicon contents in the molten aluminum were reduced by 18.57% and 6.25%, respectively. The alumina consumption for producing primary aluminum was reduced by 8.14 kg•t −1 . The experimental results suggest that the proposed process is economical and promising for EAD recycling.

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Evaluating the Chemical Composition and the Molar Heat Capacities of a white Aluminum Dross

Cited by 44 publications

References 8 publications

Metal matrix production: Casting of recycled aluminum cans and incorporation of rice husk ash and magnesium

Metal matrix production: Casting of recycled aluminum cans and incorporation of rice husk ash and magnesium

The Integrated Fuzzy AHP and Goal Programing Model Based on LCA Results for Industrial Waste Management by Using the Nearest Weighted Approximation of FN: Aluminum Industry in Arak, Iran

A Denitrification-Phase Transition and Protection Rings (DPP) Process for Recycling Electrolytic Aluminum Dross

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