物理的 處理에 의한 廢 컴퓨터 基版으로부터 有價金屬의 分離選別 特性 硏究
A Study on the Physical Separation Characteristics of Valuable Metals from the Waste Printed Wiring Boards
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초록
폐컴퓨터기판(Printed Wiring Boards, PWBs) 은다양한종류의금속및합금류, 각종의유기및무기화합물등으로구성되어있다. 따라서폐기판에포함된유가물을경제적인방법으로분리회수하면 2차자원으로써활용가치가매우클것으로판단되어, 물리적인선별기술에의하여유가금속을분리회수하는데에따른특성연구를행하였다. 본연구에서는폐컴퓨터기판에탑재된소켓류와칩류를탈리한다음소켓류, 칩류및보드류로분리하여각각의산출물의특성에따른적절한물리적분리선별기술을적용하였다. 소켓류를파쇄하여입자크기를 -2.36 mm / +1.18 mm 범위로조절한다음건식자력선별을실시하였을때, 자성산물의약 97 wt% 가금속류였다. 칩류의경우에는 -2.36 mm / +0.15 mm 의크기로분쇄하고공기분급및건식자력선별을행하여 Fe-Ni 97%, Cu 95% 를각각회수할수있었다. 보드류의경우에는금속류가얇게프린트된상태이기때문에가능한단체분리효과를향상시키기위하여 ball mill 로분쇄하였으며, 공기분급기에의한정밀분급을행하여 Cu 77% 를회수할수있었다.
Abstract
Printed wiring boards (PWBs) of the obsolete computers are composed of various organic and inorganic compounds as welas metals and alloys. As convinced that the valuable metals obtained from the PWBs are effectively utilized as secondaryresources when recovered by economical methods, in this study, an investigation for characterizing the physical separation tech-boards are subjected to the appropriate separation processes according to the physical properties of each part. In the case ofcrushed socket scraps size ranged from -2.36 mm to +1.18 mm, approximately 97 wt% of the product obtained by magneticseparation consists of metalic compounds. In the case of chip scraps, 97% of Fe-Ni alloy and 95% of Cu metal are recoveredby the combined process of air classification and dry magnetic separation in the size range from -2.36 mm to +0.15 mm. Balldsand approximately 77% of Cu metal is recovered by zigzag separation after ball miling.