Effect of additional methods using Shirasu on removal of magnesium from molten aluminum scrap

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  • アルミニウムスクラップ溶湯からのマグネシウムの除去に及ぼすシラスの添加方法の影響
  • アルミニウム スクラップ ヨウトウ カラ ノ マグネシウム ノ ジョキョ ニ オヨボス シラス ノ テンカ ホウホウ ノ エイキョウ

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To remove magnesium, one of the main impurity elements in aluminum scrap, compound-separation method by addition of Shirasu (natural mineral from Kagoshima) consisting of SiO2 and Al2O3 into the molten metal was conducted. As additional method, effects of the stepped additional method and continuous additional method of Shirasu on the removal efficiency was studied. Aluminum scrap containing 4.63 mass% magnesium was melted using an electric furnace in air atmosphere, When Shirasu is added into molten scrap, MgAl2O4 and MgO are formed as the dross by the reaction between Shirasu and magnesium in the molten scrap. By removing the dross, it is feasible to remove magnesium in molten scrap. In the stepped additional method, Mg2Si is formed by the reaction between magnesium and silicon produced by decomposition of SiO2 during solidification after each stepped addition. The amount of Mg2Si in molten scrap increases with the increase in the number of Shirasu addition, resulting in the saturation of magnesium removal. In the continuous additional method, the amount of removed magnesium increases with the increase in the number of Shirasu addition because Mg2Si is not formed in molten scrap.

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