The Use of Aluminum Dross in Refractory Materials from the Recycling Process of Aluminum Alloys

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Krisana Poolsawat ◽  
Tanikan Thongchai ◽  
Narumon Seeponkai
Keyword(s):  
Aluminum Alloys ◽  
Refractory Materials ◽  
Recycling Process ◽  
Aluminum Dross

Effects of Excess Si, Excess Mg and Fe on Precipitation in 6061 Aluminum Alloys during Recycling Process

2000 ◽  
Vol 331-337 ◽  
pp. 1125-1132 ◽  
Author(s):  
Atsushi Yamamoto ◽  
Harushige Tsubakino ◽  
Akira Suehiro ◽  
Atsushi Watanabe
Keyword(s):  
Aluminum Alloys ◽  
Recycling Process ◽  
Excess Mg

scholarly journals Material Flow Analysis of Aluminum Dross and Environmental Assessment for Its Recycling Process

2007 ◽  
Vol 48 (8) ◽  
pp. 2219-2224 ◽  
Author(s):  
Kenichi Nakajima ◽  
Hirotake Osuga ◽  
Kazuyo Yokoyama ◽  
Tetsuya Nagasaka
Keyword(s):  
Environmental Assessment ◽  
Material Flow ◽  
Flow Analysis ◽  
Material Flow Analysis ◽  
Recycling Process ◽  
Aluminum Dross

Slag Formation – Thermodynamic Aspects and Experimental Observations

2016 ◽  
Vol 16 (4) ◽  
pp. 227-232
Author(s):  
Lauri Holappa ◽  
Yilmaz Kacar
Keyword(s):  
Calcium Aluminate ◽  
Reactor Vessel ◽  
Slag Formation ◽  
Refractory Materials ◽  
Reaction Products ◽  
Aluminum Dross ◽  
Secondary Metallurgy ◽  
Rapid Process ◽  
Steel Cleanliness ◽  
Metallurgical Processes

AbstractSlags have a central role in pyro-metallurgical processes. They bind impurity compounds and absorb reaction products like oxides and sulfides. Functional slags are made by adding lime, magnesia, fluorspar, bauxite, calcium aluminate or other compounds into the reactor vessel where they form the slag together with the targeted reaction products. Additionally, refractory materials of the vessel tend to dissolve into the slag and thus influence its properties. Converter process for steelmaking is a rapid process and slag formation is extremely essential to ensure slag’s metallurgical functions and to avoid harmful reactions with the refractory materials. In this contribution, the progress of understanding the phenomena controlling slag formation and means to promote it were shortly reviewed. Thermodynamic constraints in slag formation were examined and the influence of fluxing additions was experimentally stated. Prefabricated “self-fluxing” lime was tested in industrial scale and proved to be a potential slag forming agent. Slag formation in secondary metallurgy and reduction of slag with aluminum dross or granules were experienced, and the effect on desulfurization and steel cleanliness was discussed.

Synthesis of various layered double hydroxides using aluminum dross generated in aluminum recycling process

2012 ◽  
Vol 110-111 ◽  
pp. 46-52 ◽  
Author(s):  
Norihiro Murayama ◽  
Ikuo Maekawa ◽  
Hiroyuki Ushiro ◽  
Takayuki Miyoshi ◽  
Junji Shibata ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Recycling Process ◽  
Aluminum Dross ◽  
Aluminum Recycling ◽  
Double Hydroxides

scholarly journals Material Flow Analysis of Aluminum Dross and Environmental Assessment for Its Recycling Process

2008 ◽  
Vol 72 (1) ◽  
pp. 1-7
Author(s):  
Kenichi Nakajima ◽  
Hirotake Osuga ◽  
Kazuyo Yokoyama ◽  
Tetsuya Nagasaka
Keyword(s):  
Environmental Assessment ◽  
Material Flow ◽  
Flow Analysis ◽  
Material Flow Analysis ◽  
Recycling Process ◽  
Aluminum Dross

scholarly journals Synthesis of Cryolite (Na3AlF6) from Secondary Aluminum Dross Generated in the Aluminum Recycling Process

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3871
Author(s):  
Bingbing Wan ◽  
Wenfang Li ◽  
Wanting Sun ◽  
Fangfang Liu ◽  
Bin Chen ◽  
...  
Keyword(s):  
National Standard ◽  
Molar Ratio ◽  
Recycling Process ◽  
Water Leaching ◽  
Secondary Aluminum ◽  
Co2 Gas ◽  
Aluminum Dross ◽  
Aluminum Recycling ◽  
Ignition Loss ◽  
Polyhedral Shape

Secondary aluminum dross (SAD) is regarded as a solid waste of aluminum recycling process that creates serious environmental and health concerns. However, SAD can also be used as a good source of aluminum, so that utilizing the SAD for the production of valuable products is a promising approach of recycling such waste. In the present work, a novel eco-friendly three-step process was proposed for the synthesis of cryolite (Na3AlF6) from the SAD, and it consisted of (1) water-washing pretreatment of SAD, (2) extraction of Al component via pyro-hydrometallurgy, including low-temperature alkaline smelting, water leaching and purification of leachate in sequence, (3) precipitation of cryolite from the purified NaAlO2 solution using the carbonation method. By analysis of the parameter optimization for each procedure, it was found that the maximum hydrolysis efficiency of aluminum nitride (AlN) in the SAD was around 68.3% accompanied with an extraction efficiency of Al reaching 91.5%. On this basis, the cryolite of high quality was synthesized under the following optimal carbonation conditions: reaction temperature of 75 °C, NaAlO2 concentration of 0.11 mol/L, F/(6Al) molar ratio of 1.10, and 99.99% CO2 gas pressure, and flow rate of 0.2 MPa and 0.5 L/min respectively. The formation of Na3AlF6 phase can be detected by XRD. The morphological feature observed by SEM revealed that the as-synthesized cryolite had a polyhedral shape (~1 μm size) with obvious agglomeration. The chemical composition and ignition loss of the as-synthesized cryolite complied well with the requirements of the Chinese national standard (GB/T 4291-2017).

Analytical Electron Microscopy Study of Second-Phase Particles in 7075 and 7475 Aluminum Alloys

1985 ◽  
Vol 43 ◽  
pp. 348-349
Author(s):  
M. Raghavan ◽  
J. Y. Koo ◽  
J. W. Steeds ◽  
B. K. Park
Keyword(s):  
Aluminum Alloys ◽  
Silicon Oxide ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Partial Substitution ◽  
Second Phase ◽  
X Ray ◽  
Second Phase Particles ◽  
Almost All

X-ray microanalysis and Convergent Beam Electron Diffraction (CBD) studies were conducted to characterize the second phase particles in two commercial aluminum alloys -- 7075 and 7475. The second phase particles studied were large (approximately 2-5μm) constituent phases and relatively fine ( ∼ 0.05-1μn) dispersoid particles, Figures 1A and B. Based on the crystal structure and chemical composition analyses, the constituent phases found in these alloys were identified to be Al7Cu2Fe, (Al,Cu)6(Fe,Cu), α-Al12Fe3Si, Mg2Si, amorphous silicon oxide and the modified 6Fe compounds, in decreasing order of abundance. The results of quantitative X-ray microanalysis of all the constituent phases are listed in Table I. The data show that, in almost all the phases, partial substitution of alloying elements occurred resulting in small deviations from the published stoichiometric compositions of the binary and ternary compounds.

ELABORATION PROCESS OF REFRACTORY MATERIALS BY REACTIVE PROJECTION OF OXIDE, PEROXIDE AND METALS

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-159-C1-163
Author(s):  
M. PILATTI ◽  
J. CRANSVELD ◽  
G. RAYMOND ◽  
E. PLUMAT ◽  
P. H. DUVIGNEAUD
Keyword(s):  
Refractory Materials ◽  
Elaboration Process
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