氧化亚铁硫杆菌浸出废弃线路板中金属铜的研究  

Study on leaching copper from wasted printed circuit board by thiobacillus ferrooxidans

作　　者：周吉奎[1] 邱显扬[1] 刘勇[1] 刘牡丹[1] 刘珍珍[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院),广东广州510650

出　　处：《材料研究与应用》2011年第4期313-317,共5页Materials Research and Application

摘　　要：利用从硫化矿山分离得到氧化亚铁硫杆菌GZY-1菌株,进行了废弃线路板粉末中金属铜的浸出实验,并对浸出机理进行了分析,同时对浸出体系的pH值、氧化还原电位和细菌数量的变化进行了研究.结果表明:细菌具有将Fe2+不间断地氧化成为Fe3+的生物学特性;在浸出温度30℃及pH值1.32、液固比10∶1、搅拌速率500r/min的条件下,经48h浸出,金属铜的浸出率达到95.16%;浸出过程中,浸出体系的Eh值先降低后升高;部分菌体吸附在固体物表面,使溶液中细菌数量减少,但最终会达到动态平衡.Thiobacillus ferrooxidans strain of GZY-1 isolated from water collected in sulphide mine was employed for leaching copper from the powder of printed circuit board（PCB）. In the bioleaching mechanism, ferric iron as the chemical agent was applied by regeneration from ferrous iron through biological oxidation by Thiobacillus ferrooxidans. The changes of pH value, Eh value and the cell density of strain of GZY-1 were recorded in the course of bioleaching. The results showed that the bioleaching rate of copper from PCB reached 95.16% under the optimum conditions of bioleaching temperature 30℃, pH value 1.32, liquid-solid ratio（ml/g） for 10：1, agitation speed 500rpm and 48 hours bioleaching time. The oxidation-reduction potential Eh value of the solution declined in the early stage of bioleaching then rose gradually. The cell density of strain of GZY-1 in the solution reduced in the early stage due to the adhesion of bacteria to the power of PCB then reached dynamic balance.

关 键 词：氧化亚铁硫杆菌 线路板 铜 PH值 氧化还原电位Eh值 

分 类 号：X705[环境科学与工程—环境工程]