The general utilization of scrapped PC board.
The traditional burning process is used to recover copper from scrapped PC board (printed circuit board) but it causes serious environmental problems. In this research a new process 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 NH3/NH5CO3 solution with aeration in order to dissolve copper. After distilling the copper NH3/NH5CO3 solution and then heating the distilled residue of copper carbonate, pure copper oxide was obtained with particle size of about 0.2 microm and the shape elliptical. The remaining solid residue after copper removal was then leached with 6N 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.
Liu
Robert
R
Department of Chemical and Materials Engineering, Minghsin University of Science and Technology, Hsinchu, Taiwan.
Shieh
R S
RS
Yeh
Ruth Y L
RY
Lin
C H
CH
D000641:Ammonia / Q000737:chemistry; D002219:Carbamates / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D055615:Electrical Equipment and Supplies; D007700:Kinetics; D012037:Refuse Disposal / Q000379:methods*; D018505:Waste Management; D014866:Waste Products / Q000032:analysis*
D002219:Carbamates; D014866:Waste Products; D000641:Ammonia; D003300:Copper; C070766:carbamic acid; C030973:cupric oxide