Recycling of aluminum dross for producing calcinated alumina by microwave plasma

Lin, Wen-chang; Tsai, Cheng‐Hsien; Zhang, Da-Nian; Syu, Sheng-Syong; Kuo, Yi‐Ming

doi:10.1186/s42834-022-00160-9

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Lastly, aluminium dross (or slag), which is considered an odorous hazardous waste [1,175,183], may be treated using plasmas. This may achieved by using a plasma torch to recover aluminium at a very high efficiency [175,184], or by applying an MW plasma torch to produce calcinated alumina [183].…”

Section: Recovery Of Metalsmentioning

confidence: 99%

Applications of Plasma Technologies in Recycling Processes

Kusano,

Kusano

2024

Materials

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Plasmas are reactive ionised gases, which enable the creation of unique reaction fields. This allows plasmas to be widely used for a variety of chemical processes for materials, recycling among others. Because of the increase in urgency to find more sustainable methods of waste management, plasmas have been enthusiastically applied to recycling processes. This review presents recent developments of plasma technologies for recycling linked to economical models of circular economy and waste management hierarchies, exemplifying the thermal decomposition of organic components or substances, the recovery of inorganic materials like metals, the treatment of paper, wind turbine waste, and electronic waste. It is discovered that thermal plasmas are most applicable to thermal processes, whereas nonthermal plasmas are often applied in different contexts which utilise their chemical selectivity. Most applications of plasmas in recycling are successful, but there is room for advancements in applications. Additionally, further perspectives are discussed.

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Section: Recovery Of Metalsmentioning

confidence: 99%

Applications of Plasma Technologies in Recycling Processes

Kusano,

Kusano

2024

Materials

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“…SAD is a potential source of secondary aluminum, with an alumina content that can exceed 60% [7,23]. Recycling it as a raw material for aluminum smelting by increasing its alumina content could significantly reduce recycling costs and fulfill enterprise expectations [24][25][26]. In this study, the effects of hydrolysis factors, including temperature, time, liquid-solid ratio, additive type and additive dosage, on the removal rate of aluminum nitride in SAD during wet treatment were studied with the goal of reduction and harmless treatment.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Jiang,

Lee

2024

Sustainability

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Secondary aluminum dross is a solid waste generated after removing aluminum from industrial aluminum slag (primary aluminum dross), which is included in the European Hazardous Waste List because of harmful substances such as aluminum nitride. More and more SAD is being directly disposed of in landfills, which will not only harm the ecological environment and human health, but also cause resources. Under the background of green and low-carbon circular economy, nitrogen removal and resource recycling of SAD are very important environmental pollution, resource and the economic benefits of the aluminum industry. In this study, a new method was introduced to explore the interaction between various factors in the denitrification process by using the response surface method, and the optimal denitrification process conditions were predicted and determined by a regression equation that is, the denitrification rate of SAD was 99.98% at the reaction time of 263 min, reaction temperature of 95 ℃ and concentration of 6.5 wt.%. Furthermore, the content of Al2O3 in SAD was successfully elevated to 98.43% through the reaction carried out in a 10 wt.% NaOH solution system at the controlled temperature of 90 °C for 5 h. It was summarized that the wet treatment methodology can efficiently eliminate aluminum nitride (AlN) from SAD and heighten the Al2O3 grade to meet metallurgical standards. This research is expected to eliminate the adverse impact of SAD on the environment and its safety risks, and provide an innovative method for the sustainable resource utilization of SAD.

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“…In addition, alumina powder can be produced from aluminum dross, a byproduct of aluminum metallurgy. This subject was well investigated in 2022 by Lin et al, who produced several types of alumina powder, such as θ, γ, and α of Al 2 O 3 , starting from aluminum dross [15]. They compared different routes of calcination to produce Al 2 O 3 powder, such as a normal induction furnace and microwave plasma techniques, to produce alumina powder starting from aluminum hydroxide, which had already been produced by a chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

Esaifan,

Al-Mobydeen,

Al-Masri

et al. 2023

Inorganics

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Aluminum oxide production from aluminum filings, which are a byproduct of several industrial machining processes and cannot be recycled to attain bulk aluminum (Al), is vital due to its wide use in scientific research and industry. The goal of this paper is to produce ultrafine and down-to-the-nanoscale alumina powder (Al2O3), starting from a waste Al filings. The microstructure and composition of the starting Al used were investigated using scanning electron microscopy (SEM), which was equipped with an attached energy dispersive spectrometer (EDS) unit. The results of this investigation confirmed that the starting Al was mainly Al–Mg alloy. Al2O3 was produced using two routes: The first involved the burning of aluminum hydroxide Al(OH)3 that was precipitated from aluminum chloride solution (AlCl3) resulting from dissolving the Al filings in 2M HCl. The second route involved direct precipitation as a reaction product of aluminum chloride with sodium carbonate solution. The Al2O3 produced using both routes, as well as the intermediate product Al(OH)3, were studied by SEM. The results demonstrate that the nanoscale range size was reached after milling of the produced Al2O3. Following thorough washing with distilled water, the EDS and the XRD techniques confirmed the formation of Al2O3, with no residual salt detected. The EDS results showed that the ratios of Al and O in the produced Al2O3 were about 96% of the ideal compound ratios. The XRD analysis also revealed the amorphous structure of the standard and the produced Al(OH)3, whereas the phases of the produced Al2O3 were either crystalline or amorphous. In our study, the Al2O3 percentage yield was about 77%, and this value obviously depends on the percentage of Al dross in the original Al filings. Overall, this research provides a novel contribution to the production of alumina powder in the nano-range starting from an aluminum filings byproduct, thereby reducing the dependence on known sources of aluminum.

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Recycling of aluminum dross for producing calcinated alumina by microwave plasma

Cited by 8 publications

References 23 publications

Applications of Plasma Technologies in Recycling Processes

Applications of Plasma Technologies in Recycling Processes

Optimizing Wet Hydrolysis for Nitrogen Removal and Alumina Recovery from Secondary Aluminium Dross (SAD)

Synthesis of Nanostructured Alumina from Byproduct Aluminum Filings: Production and Characterization

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