使用済みパソコン回路基板の金属分離プロセス

概要

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The used printed circuit board (PCB) contains the valuable metals such as Cu, Au, Ag and Pd and the harmful metals such as Cu, Cr, Pb and Br that effect the environment. Therefore the metal collection from thePCB is important even from a viewpoint of resources advanced utilization and environment conservation. In this research, we examined it using the method that separates the materials from the PCB of a discard personal computer. After the PCB was cut to the size of20 mm× 20 mm, to remove resin such as C ,H and N, it was heated at 873K. After heating, the PCB was crushed by a boll mill and the milled powders were separated to a magnetics and unmagnetics by magnetic force. Because the unmagnetics powders contained 39mass% of C, it was heated at 1273K in atmosphere of 95%Ar+5%H2 , The powder that adjusted a slag was heated at 1773K in atmosphere of 97%Ar+3%H2. As a result, the slag and metal were separated and 80% of valuable metals that are included to the PCB became collected.
愛媛大学の論文