2010
DOI: 10.2320/matertrans.mh200914
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Removal of Magnesium from Molten Aluminum Scrap by Compound-Separation Method with Shirasu

Abstract: The removal of magnesium from the molten aluminum scrap containing magnesium was examined by compound-separation method using Shirasu as an additive. When Sirasu is added to the molten aluminum scrap, which is followed by agitation, MgAl 2 O 4 and MgO are formed by the reactions among SiO 2 and Al 2 O 3 in Shirasu and magnesium in the molten scrap. It is feasible to remove magnesium by separating these reaction products as dross. The effect of addition temperature of Shirasu on magnesium removal is smaller tha… Show more

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Cited by 6 publications
(5 citation statements)
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“…The energy required for this process is approximately 3% of the energy used when the Hall-Heroult process is employed. [2][3][4] This mainstream recycling process is known as "cascade recycling" 2,5 because various alloying elements are mixed in each time the recycling is repeated, thus decreasing the quality. 6,7 The process does not remove the alloying additive elements, but only readjusts the concentrations where a low quality is acceptable, hence, the resulting material is often used as a raw material for Al casting alloys 8 and die casting.…”
Section: Introductionmentioning
confidence: 99%
“…The energy required for this process is approximately 3% of the energy used when the Hall-Heroult process is employed. [2][3][4] This mainstream recycling process is known as "cascade recycling" 2,5 because various alloying elements are mixed in each time the recycling is repeated, thus decreasing the quality. 6,7 The process does not remove the alloying additive elements, but only readjusts the concentrations where a low quality is acceptable, hence, the resulting material is often used as a raw material for Al casting alloys 8 and die casting.…”
Section: Introductionmentioning
confidence: 99%
“…The secondary production of Al is more environmentally sound and energy efficient than primary production. in Al scrap, mg is one of the main impurity elements since a great quantity of mg is added to Al alloys to improve mechanical properties and corrosion resistance [1,2]. moreover, mg enrichment in Al alloys can increase the oxidation tendency during melting process for a long duration [3,4].…”
Section: Introductionmentioning
confidence: 99%
“…moreover, mg enrichment in Al alloys can increase the oxidation tendency during melting process for a long duration [3,4]. The use of silica-based powders is considered a viable option to remove mg in Al scrap [2,5]. According to the previous reports on effect of Sio 2 on mg removal in Al scrap [2,5], mgo and mgAl 2 o 4 -spinel are formed by reduction of Sio 2 , leading to loss of mg and dissolution of Si in Al melt occurring simultaneously.…”
Section: Introductionmentioning
confidence: 99%
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“…In the recycling of aluminum alloys, impurities were removed by additional substances to form a compound between impurity and additional elements. 7) Formability of compound depends on the affinity between magnesium, impurity element and additional element. Previously, it has been reported that carbon addition into Mg-3 mass% Al alloy melt was effective to form compounds including iron.…”
Section: Introductionmentioning
confidence: 99%