细菌液流速对废旧印刷线路板中铜浸出的影响  

Effect of Bacterial Leaching Water Speed on Copper Lixiviation from Waste Printed Circuit Boards

作　　者：杨东升[1] 孙利 简颖臻 张宇 谌书[1] 

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010

出　　处：《环境科学与技术》2017年第12期58-62,共5页Environmental Science & Technology

基　　金：固体废物处理与资源化教育部重点实验室开放基金(08zxgk03);固体废物处理与资源化教育部重点实验室平台基金(13zxgk07)

摘　　要：研究T.ferrooxidans液流速对柱式反应器内废旧印刷线路板中Cu浸出的影响。设计柱式淋滤反应器,培养10 L 4.5 K培养基条件下氧化亚铁硫杆菌菌液,分别以40 mL/min、20 mL/min的流速淋滤8~10 mm、2500 g的WPCBs颗粒,采用上批母液接种下批淋滤液方式,3次淋滤WPCBs。研究淋滤过程中pH值、ORP、浸出液Cu^(2+)浓度、Fe^(2+)浓度的变化。使用2 mol/L H_2SO_4清洗沉淀;收集酸淋滤后的沉淀并分析沉淀物像成分。20 mL/min流速的淋滤液对WPCBs颗粒最终浸Cu浓度为2.593 mg/mL;40 mL/min流速的淋滤液对WPCBs颗粒最终浸Cu浓度为2.279 mg/mL。淋滤过程中,流速为20 mL/min浸出液的pH高于流速为40 mL/min浸出液的pH;且流速为20 mL/min较流速为40 mL/min的淋滤液更有利于维持后续Cu浸出所要的Fe^(2+)含量、高ORP环境。2 mol/L的H_2SO_4能清洗沉淀;沉淀主要是CuSO_4·3H_2O。流速为20 mL/min的淋滤液较流速为40 mL/min的淋滤液淋滤2500 g的WPCBs后,其浸Cu效果优于40 mL/min淋滤液流速的浸Cu效果。Effect of bacterial leaching water speed on copper lixiviation from waste printed circuit boards（WPCBs） in column leaching reactor was investigated. WPCBs particles of 2500 g and particle size 8-10 mm 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, Cu^2＋concentration in leach ING water, Fe^2＋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 mL/min was higher than 40 mL/min did. The leached water with 20 mL/min was more conducive to the maintenance of Fe^2＋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 2500 g WPCBs than 40 mL/min did.

关 键 词：氧化亚铁硫杆菌 生物淋滤 废旧印刷线路板 铜 

分 类 号：X705[环境科学与工程—环境工程]