Abstract: Taking improving 9K culture solution inoculated from Thiobacillus ferrooxidans (calling “GZY-1#”)as the leaching agent, N902 as the extraction agent, the sulfuric acid solution as a stripping agent, and the lead-based alloy plates and stainless steel plates as the anode and cathode of the electrolyzerat respectively, experiments of biochemical leaching-extraction-electrodeposition are made to extract copper from waste printed circuit boards of Guangdong Qingyuan Jintian Nonferrous Metals Company at room temperature.Under the appropriate conditions, the average copper leaching rate from samples reached 95.29%, and the average copper content in leached residue reduced by 0.088%.Through the extract-back-extract-electrodeposition, the electrodeposited copper purity reached 99.95%.Through the tests, high recovery of copper from waste printed circuit boards was realized, and the problem of the copper interference in comprehensive utilization of non-metallic materials in the waste printed circuit board was solved as well.

Key words: Wasted printed circuit board, Copper, Thiobacillus ferrooxidans, Biochemical leaching, Extraction, Electrodeposition