科研之友
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摘要
Printed circuit board (PCB) recycling is an important challenge for today's industry. The traditional burning process is used to recover copper from scrapped PC board (printed circuit board) bid it causes serious environmental problems. A new method was developed in this study, which utilized NH(3)/NH(5)CO(3) solution to leach copper and hydrochloric acid to leach tin and lead. The resulting leached residue was then used as a filler for PVC plastics. This method not only had zero pollution but also maximized the materials recovered from the PC board. In this research a new method was developed which not only prevents pollution problems, but also maximizes the utility of all the materials on the waste board. First, the scrapped PC board was crushed and grounded, then placed in the NH(3)/NH(5)CO(3) solution with aeration in order to dissolve copper. After distilling the copper NH(3)/NH(5)CO(3) solution and then heating the distilled residue of copper carbonate, pure copper oxide was obtained with particle size of about 0.3 mu m and the shape irregular. The remaining solid residue after copper removal was then leached with 6 N hydrochloric acid to remove tin and lead. The last residue was used as a filler in PVC plastics. The PVC plastics with PC board powder as filling material was found to have the same tensile strength as unfilled plastics, but had higher elastic modulus, higher abrasion resistance, and was cheaper.
- 出版日期2010
