Effect of Bacterial Leaching Water Speed on Copper Lixiviation from Waste Printed Circuit Boards
YANG Dongsheng
SUN Li
JIAN Yinzhen
ZHANG Yu
CHEN Shu
Abstract：Effect of bacterial leaching water speed on copper lixiviation from waste printed circuit boards (WPCBs) in column leaching reactor was investigated.WPCBs particles of 2 500 g and particle size 8～10mm was leached by the flow rate of 40 mL/min and 20 mL/min three times respectively,after column leaching reactor was designed.The Thiobacillus ferrooxidans bacteria leaching water was cultured in 10 L of 4.5 K media,which inoculated by former leaching water.The change of ORP,Cu2+ concentration in leachiNG water,Fe2+ concentration and pH were investigated during leaching process.The precipitation occurred after leaching was cleaned using H2SO4 of 2 mol/L,after which precipitation was collected and analyzed for its ingredients.The leaching water speed of 20 mL/min performed better on Cu lixiviation than 40 mL/min did,with which Cu concentration was up to 2.593 mg/mL and 2.279 mg/mL in leached water respectively after WPCBs particles was leached.The pH in leached water after the leaching water speed of 20 rnL/min was higher than 40 mL/min did.The leached water with 20 mL/min was more conducive to the maintenance of Fe2+ concentration and high ORP in water,which was helpful for Cu lixiviation afterwards.Precipitation was cleaned by H2SO4 of 2 mol/L.Precipitation collected after H2SO4 leached mainly was CuSO4· 3H2O.The leaching water speed of 20 mL/min performed better on Cu lixiviation from 2 500 g WPCBs than 40 mL/min did.
Keywords：Thiobacillus ferrooxidansbioleachingwasted printed circuit boardscopper
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 58-62 )