Study on gasification characteristics of waste printed circuit boards (PCB) in molten salts
废弃印刷线路板熔融盐气化特性研究

Gasification of waste printed circuit boards (PCB) was carried out in a molten salt reactor to investigate the effect of equivalence ratio (ER) on the gasification reaction. The gas yield and carbon conversion rate increased with the equivalence ratio. When ER increased to 40%, the gas yield reached 840 mL·g-1 and the carbon conversion was 96%. The gas heating value decreases with ER, and the gasification efficiency first increased, then decreased with ER, reaching a maximum of 94% when ER was 20%. The liquid PCB pyrolysis products in the molten salt were analyzed by gas chromatography- mass spectrometry (GC-MS). The main liquid products were identified as phenol, 2-methylphenol, 4-methylphenol, and naphthalene indicating a total splitting of phenyl and long-chain alkyl or aliphatic branches, and an enforced splitting of C(phenyl)-O, and aromatization reaction happening during the pyrolysis of PCB in molten salt.