Influence of various additives on pyrolysis-debromination of resin in non-metal components(NMFs)in wasted printed circuit boards(WPCB)was investigated.The results show that urea additive can effectively promote removal of Br-containing flame retardant and the formation of gas phase HBr

bromomethane and bromoethane

increase amount of phenol and its derivative in pyrolysis-residue oil; and reduce amount of Br content in solid residue C.However

for DDM(4

4'-diaminodiphenylmethane)additive

although it can promote formation of phenol and its derivative

decrease gas products and increases liquid and solid products

it can not remove Br in NMFs resin of WPCB.For hexamethylenetetramine

in spite of removing Br-containing flame retardant and forming gas phase products such as HBr

methyl bromide

and ethyl bromide

decreases obviously liquid products such as phenol and its derivative

but find large amount of N-methylacetamide and N

N-dimethylformamide in liquid products.Besides

hexamethylenetetramine makes amount of liquid and solid products increase and that of gas products decrease.