Fine Al₂O₃Powder Produced by Radio-Frequency Plasma From Aluminum Dross

Abstract

Aluminum dross is generated as a byproduct in aluminum production or aluminum recycling processes. The major chemical composition of aluminum dross is aluminum element, and it has potential as a starting material to produce high-purity fine aluminum oxide (Al 2 O 3 ) powder. In this paper, a radio frequency (RF) plasma synthesis system is designed as a high-temperature source to produce Al 2 O 3 from aluminum dross. As the RF power increased to 3.5 kW, the color of Al 2 O 3 ceramic powder is transferred to pure white. X-ray diffraction analysis results showed that the synthesized powder comprises of corundum (α-Al 2 O 3 ). The particle size distribution analysis results showed d 50 was 8 μm. The purity of the synthesized Al 2 O 3 powder is 99.95%. In general, the 92% Al 2 O 3 can be applied as commercial product. The quality of Al 2 O 3 powder synthesized in this paper is exceeded this level and has higher value as they are sold in the market. The RF plasma technique developed is proven suitable for treating aluminum dross and converting it into a marketable product.Index Terms-Aluminum dross, aluminum oxide, plasma synthesis system, radio frequency.

Sustainable Applications for Disposal of Recycled Aluminum: A Systematic Literature Review Using the SciMAT Software

“…A radio-frequency (RF) plasma synthesis system was designed as a high-temperature source to produce Al 2 O 3 with 99.95% of the purity of the powder. The production was from aluminum cast slag and the results indicated the potential for commercialization [46].…”

“…8. The main authors associated with aluminum alloy residue pretreatment are also associated aluminum casting [48][49][50][51][52][53][54][55][56][57][58] aluminum recycling [5,59,60] automotive boards [23,[25][26][27], and especially aluminum alloys [34,[40][41][42][43][44][45][46][47].…”

“…The impact of the resistivity of an alloy was also analyzed, and the use of Ti and Co as a wetting layer to fill the gaps in the aluminum castings was explored [45]. The casting of aluminum from a slag using a radio frequency plasma produced a fine powder of Al 2 O 3 that was studied by Yang et al [46]. The effect of Si addition on the stability of the Al-10Ti-5Cu-xSi interface was evaluated by Wang et al [43] and, similarly, Zhang et al [47] presented the proprieties and microstructure of Al-Ga alloys with different Mg/Sn ratios.…”

“…Common areas shared by the main authors of the period Specific applications in the formation of aluminum-based alloys with the inclusion of other elements, offering new alloy proposals[40][41][42][43][44][45][46][47] Casting processes, material development-analysis of microstructures and formation of grains and crystals of metallic structures dem-…”

Effect of Alumina Additives on Mechanical and Fresh Properties of Self-Compacting Concrete: A Review

“…It was reported that the plasma process provides cheaper operation costs (at least 23%) with lower residues than oil/gas burners. Yang et al [108] treated aluminum dross using a radio frequency-based plasma to recover high-purity fine aluminum oxide (with the size of 8 µm). Saravanakumar et al [88] reported using arc plasma to convert dross of aluminum into alumina powder in an eco-friendly manner.…”