Microwave Anaerobic Thermal Removal of Bromine from Copper-Containing Glass Fiber Resin

The migration and transformation of bromine in the pyrolysis process of copper-containing glass fiber resin (CGFR) under microwave heating have been studied, and the pyrolysis products analyzed. With the increase of microwave power, the solid-phase yield and the bromine content in the solid-phase product showed a trend of first decreasing and then increasing. Under the optimized conditions (700°C, 1000 W, 60 min), the solid yield was 74.41%, the bromine content in the solid product was 78 ppm, and the removal rate of bromine was 14.19% higher than that of conventional pyrolysis. Bromine mainly exists in organic form and is encapsulated in CGFR polymers. Microwave pyrolysis can heat the CGFR as a whole, promote the release of bromine in these organic inclusions, and ultimately improve the removal rate of bromine. However, the higher microwave power will cause the CGFR to violently pyrolyze, and the organic matter will carbonize, which will hinder the release of bromine. In this study, the migration and transformation mechanism of bromine in microwave pyrolysis of CGFR has been proposed, which proves that microwave pyrolysis plays a positive role in the recovery process of CGFR, improved its recovery and utilization efficiency.