氧化亚铁硫杆菌浸出线路板中铜的作用方式研究  

Mechanism of leaching of copper from printed circuit board by Thiobacillus ferrooxidans

作　　者：周培国[1] 郑正[2] 彭晓成[2] 王艳锦[2] 

机构地区：[1]南京林业大学木材工业学院,江苏南京210037 [2]污染控制与资源化研究国家重点实验室,南京大学环境学院,江苏南京210093

出　　处：《环境污染与防治》2009年第10期57-60,63,共5页Environmental Pollution & Control

摘　　要：通过实验方法,研究微生物浸出线路板中铜的作用方式,确定固、液相微生物对浸出的影响。结果表明:(1)实际浸出后固相生物量占总生物量的95%左右,固相生物量和液相生物量接近20∶1(摩尔比)。(2)铜的浸出率符合经典的收缩核模型。(3)扫描电镜观察发现,铜浸出后表面存在与氧化亚铁硫杆菌尺度一致的沟壑。透析袋的隔离实验表明,氧化亚铁硫杆菌的间接浸出率约占总浸出率的40%左右,氧化亚铁硫杆菌的直接浸出率占60%左右。这表明,浸出过程存在氧化亚铁硫杆菌与铜的直接接触作用,且这个作用在浸出过程中起主导作用。Thiobacillus ferrooxidans isolated from water collected in coal storage yard was acclimated and then employed for leaching of copper from printed circuit board particles （〈80 mesh, Cu of 14.5 -20. 7% ）. The variation of microbe biomass and the function of Thiobacillus ferrooxidans during the leaching were analyzed and investigated. The results showed that the microbe biomass in the liquid and solid phases kept stable proportion of biomass in solid accounted for above 95%, and the process was corresponded to shrinking core model. In the surface of copper after 120.0 h of leaching, the corrosion pits with the same dimension of microbe were found with the help of SEM,which means the Thiobacillus ferrooxidans was first adsorbed on the surface of copper before the leaching. The isolation experiment with dialysis bag showed the copper leached by directly surface contacting account for 60% of total leaching rate.

关 键 词：氧化亚铁硫杆菌 线路板 铜 机制 

分 类 号：X705[环境科学与工程—环境工程]