Pyrolysis Characteristics and Recovery of the Metallic and Nonmetallic Materials in Wasted Printed Circuit Boards
A typical printed circuit boards (PCBs) has been investigated by using thermo-gravimetric analyser to study its pyrolysis characteristics, the results indicate that the maximum weight loss rate occurs at temperature between 320°C and 360°C. A higher heating rate results in higher initial, final, peak temperature, and a longer process of significant weight loss. At the same pyrolysis temperature, heating rate has little effect on the total weight loss. In addition, 1kg PCBs based FR-4 was pyrolyzed in a fixed-bed reactor. The pyrolysis residues are very friable, the organic, glass fiber and metallic fractions can easily be separated, and the electrical components can easily be removed from the remains. Considering energy-saving, better control and design of the pyrolysis process, the optimal pyrolysis parameters were suggested at heating rate 10°C/min, final pyrolysis temperature 500°C and holding time 30 min.
Weiguo Pan, Jianxing Ren and Yongguang Li
H. T. Ma et al., "Pyrolysis Characteristics and Recovery of the Metallic and Nonmetallic Materials in Wasted Printed Circuit Boards", Advanced Materials Research, Vols. 347-353, pp. 2107-2111, 2012