Enhanced bromine fixation and tar lightweighting in co-pyrolysis of non-metallic fractions of waste printed circuit boards with Bayer red mud.

[Display omitted] • Red mud (RM) was used for catalytic pyrolysis of NMFs. • Enhanced bromine fixation and tar lightweighting were realized. • Fe 2 O 3 , CaCO 3 and Al 2 O 3 in RM played key roles in catalytic pyrolysis of NMFs. • 89.55 wt% bromine in NMFs could be fixed in solid residue with adding 15 wt% RM. • RM increased the content of lightweight tar by 44.29 % in co-pyrolysis system. A co-pyrolysis process for non-metallic fractions (NMFs) from WPCBs with Bayer red mud (RM) is proposed to upgrade pyrolysis products in this study. High bromine fixation efficiency was realized, and higher content of lightweight pyrolysis tar was obtained. The mechanism of catalytic pyrolysis and simultaneous bromine fixation of NMFs by RM was investigated by experiments and theoretical calculations. The three inorganic components of Fe 2 O 3 , CaCO 3 and Al 2 O 3 in RM played key roles in the catalytic pyrolysis of NMFs, and their order of catalytic debromination effect was CaCO 3 > Fe 2 O 3 > Al 2 O 3. By adding 15 wt% RM, the pyrolysis solid residue could fix 89.55 wt% bromine, compared with 35.42 wt% of NMFs without adding RM, due to the formation of FeBr 2 and CaBr 2 from Fe 2 O 3 and CaCO 3 in RM, respectively. Tar lightweighting was realized by reducing the energy barrier of the direct decomposition of tetrabromobisphenol A (TBBPA) in NMFs. The order of effect of the three key components on the tar lightweighting was Fe 2 O 3 > Al 2 O 3 > CaCO 3. The content of lightweight tar in the tar obtained by catalytic pyrolysis of NMFs with 15 wt% RM was 44.29% higher than that in the tar obtained by direct pyrolysis of NMFs. This work provides a theoretical guidance for the low-cost and eco-friendly recycling of e-wastes by co-pyrolysis with RM. [ABSTRACT FROM AUTHOR]