Fundamental experiences have been studied for development of pre-treatment process of Sn by-products such as solders. Dry and wet separation/recovery processes were considered by the differences of physical properties. The by-products, which are analyzed by solder metal and oxides. The metal and oxide were simply separated by dry ball-milling process for 12 hours, after that recovery metal powder might be reusable as lead or lead-free solders. In terms of wet separation process, samples were dissolved in HNO₃ + H₂O₂ and the precipitation were analyzed by SnO₂. Overall efficiency of recovery might be increasing via developing simple pre-treatment process.

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• Material Flow Analysis for Stable Supply and Demand Management of Tin
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