Metal scrap recycling analysis focusing on alloying elements

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The demand of alloying steel materials for automobiles has been increasing due mainly to the rapid economic growth of BRICs countries. As a result of this, secondary steel resources has been contaminated by alloying elements including Mn, Cr and Ni, and significant amount of alloying elements has been dissipated during steel recycling process. This study evaluated the current end of life vehicles recycling by means of waste input-output material flow analysis (WIO-MFA) model extended for the detailed analysis for the automobile industry. Combination of WIO-MFA and linear programming method clarified appropriate matchings of sorted parts scrap can achieve 88% of alloying elements to be utilized as the source of them for secondary steelmaking process.