Environmental-friendly recovery of non-metallic resources from waste printed circuit boards: A review

The recovery trend of waste printed circuit boards has changed from stabilization to valued-added recovery, but the low value and complexity components of the nonmetallic resources greatly restrict its development. Therefore, the recovery of nonmetallic components deserves more attention and better guidance. This paper reviews the recent developments of the recycling techniques for nonmetallic components, including pyrolysis, supercritical fluid oxidation, chemical leaching, and direct recycling of synthetic materials. The clean production level, recycling efficiency, and economic value of these methods are the focus of this review. The key to improving the recycling technology for non-metallic component is to remove the harmful elements during the recovery process. In the direction of future development of e-waste recovery, environmental friendliness, value, and efficiency are important equally. The novel idea of debromination to reduce potential pollution prior to subsequent processing and enhance recovery value. It can effectively realize the valued-added preparation of environmental-friendly materials by combined process. The results are expected to give guidance for the future recycling process and provide reference for industrial development. (c) 2020 Elsevier Ltd. All rights reserved.

Automated summary

The review focuses on the recent developments in recycling techniques for nonmetallic components in waste printed circuit boards, highlighting the importance of clean production, recycling efficiency, and economic value. The key to future development lies in removing harmful elements, enhancing environmental friendliness and value, and realizing valued-added preparation of materials through combined processes. The results are expected to guide future recycling processes and provide references for industrial development.