嗜酸氧化亚铁硫杆菌脱除废手机PCB表面元器件的方法研究

周楠; 白建峰; 顾卫华; 王健伟; 毛少华; 宋小龙; 苑文仪; 张承龙; 王景伟

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中国环境科学 ›› 2019, Vol. 39 ›› Issue (10) : 4221-4227.

固体废物

嗜酸氧化亚铁硫杆菌脱除废手机PCB表面元器件的方法研究

周楠^1,2, 白建峰^1,2, 顾卫华^1,2, 王健伟^1,2, 毛少华^1,2, 宋小龙^1,2, 苑文仪^1,2, 张承龙^1,2, 王景伟^1,2

作者信息 +

Method research of acidithiobacillus ferrooxidans on removing surface components of waste mobile phone circuit board

ZHOU Nan^1,2, BAI Jian-feng^1,2, GU Wei-hua^1,2, WANG Jian-wei^1,2, MAO Shao-hua^1,2, SONG Xiao-long^1,2, YUAN Wen-yi^1,2, ZhANG Cheng-long^1,2, WANG Jing-wei^1,2

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文章历史 +

摘要

通过微生物法实现废手机PCB基板与其表面元器件分离，并探究最佳的工艺条件.采用嗜酸氧化亚铁硫杆菌（Acidithiobacillus ferrooxidans，以下简称A.f菌）脱除废手机PCB表面元器件，研究结果表明，经接种处理，浸出3d后，PCB表面元器件有少量脱除；浸出5d后，PCB表面元器件大部分可被脱除，仍有个体较大的元器件未被脱除；浸出7d后，PCB表面元器件被完全脱除；未接种对照组中PCB表面元器件未发生脱除.通过ICP-OES测得A.f菌作用7d的浸出液中含有大量的金属离子，而这些金属离子是构成元器件与PCB衔接处焊脚的主要组成成分，其中Ni、Zn、Al通过A.f菌作用后以离子形态进入浸出液中，焊脚中的单质Sn通过A.f菌作用后转化为离子态进入浸出液中，在浸出液中又迅速形成含锡沉淀物，在浸出第1d浸出液中Sn离子含量急速下降.通过设置不同浸出条件的单因素实验，结果表明：当培养基初始pH值为1.0，固液比为3：50，接种量为15%，温度为30℃，转速为125r/min时，A.f菌脱除手机PCB表面元器件效果最佳.浸出7d后，PCB表面元器件可被完全脱除.

Abstract

The printed circuit board (PCB) substrate and surface components of waste mobile phone were separated using biological method in this work. Then the optimum process conditions were explored. Acidithiobacillus ferrooxidans (A.f), was used to remove surface components of PCB. Results showed that a small number of PCB surface components were removed after 3days of bioleaching. After 5days of bioleaching, most of the surface components of PCB could be removed, but still some larger individual components were not removed. After 7days of bioleaching, the surface components of PCB were removed completely. Meanwhile, there were no any components removed from the surface of PCB in the non-innoculation treatment. The results of ICP-OES showed that high concentration of metals ions, which were contained in welding foot of the components, was in the lixivium after 7days of bioleaching. Among them, Ni, Zn and Al were bioleaching and entered into the lixivium with the form of ions. But the elemental Sn in the welding foot was oxidized to an ionic state into the lixivium through the action of A.f, then the Sn hydroxide precipitate was formed rapidly in the lixivium. After the first day of bioleaching, the concentration of Sn ion in the lixivium was decreased rapidly. Through single factor experiments by setting different leaching conditions, the results showed that when the initial pH of the medium was 1.0, the ratio of solid to liquid was 3:50, the inoculum(v/v) was 15%, the temperature was 30℃ and the rotating speed was 125r/min, A.f had the best effect on removing PCB surface components from the PCB. After 7days of bioleaching, the surface components of PCB were removed completely.

导出引用

周楠, 白建峰, 顾卫华, 王健伟, 毛少华, 宋小龙, 苑文仪, 张承龙, 王景伟. 嗜酸氧化亚铁硫杆菌脱除废手机PCB表面元器件的方法研究[J]. 中国环境科学. 2019, 39(10): 4221-4227

ZHOU Nan, BAI Jian-feng, GU Wei-hua, WANG Jian-wei, MAO Shao-hua, SONG Xiao-long, YUAN Wen-yi, ZhANG Cheng-long, WANG Jing-wei. Method research of acidithiobacillus ferrooxidans on removing surface components of waste mobile phone circuit board[J]. China Environmental Science. 2019, 39(10): 4221-4227

中图分类号： X705

参考文献

[1] 向东,张永凯,李冬,等.面向元器件重用的废弃线路板拆解关键技术[J]. 机械工程学报, 2013,49(13):164-167. Xiang D, Zhang Y K, Li D, et al. Key technology of disassem-bling waste printed circuit board assembly for components reuse. Journal of Mechanical Engineering[J]. 2013,49(13):164-167.
[2] 邓明强,王肖倩,郭丽景.国内外线路板电子元件去除及贵金属提取现状分析[J]. 环球视角, 2014,7(12):39-41. Deng M Q, Wang X Q, Guo L J. Discussion on WPCBs components removal and precious metal extraction[J]. Globe View, 2014,7(12):39-41.
[3] 钟真宜,张兴红,叶平,等.废旧电路板元器件解锡技术研究[J]. 再生利用, 2015,18(6):32-36. Zhong Z Y, Zhang X H, Ye P, et al. Research on the antisoldering technique forelectronic components from waste printed circuit boards[J]. Journal Of Recycling, 2015,18(6):32-36.
[4] Sepulveu'da A, Schluep M, Renaud F G, et al. A review of the environmental fate and effects of hazardous subst-ances released from electrical and electronic equipments during recycling:Examples from China and India[J]. Nvironmntal mp-act Assessment Review, 2010,30(1):28-41.
[5] 宋守许,李园,刘光复,等.基于机械物理法的废旧电路板回收经济性分析[J]. 环境工程学报, 2012,6(8):2818-2824. Song S X, Li Y, Liu G F, et al. Economic analysis of reclamation of discarded PCBs based on mechanical and physical method[J]. Chinese Journal of Environmental Engineering, 2012,6(8):2818-2824.
[6] Yang J P, Xiang D, Wang J S, et al. Removal force models for component disassembly from waste printed circuit board[J]. Resources Conservation and Recycling, 2009,53(8):448-454.
[7] 马硕,刘万福,马洪亭,等.废弃印刷线路板热解过程传热特性实验研究[J]. 环境科学学报, 2018,38(12):4760-4763. Ma S, Liu W F, Ma H T, et al. Experimental investigation on the heat transfer characteristics of waste printed circuit boards during pyrolysis[J]. Acta Scientiae Circumstantiae, 2018,38(12):4760-4768.
[8] 吴育家,彭玲,刘宇,等.降低线路板破碎过程中热解污染的资源化技术[J]. 有色金属工程, 2017,7(3):93-95. Wu Y Y, Peng L, Liu Y, et al, Technology of Recycling Method of reducing Pyrolysis Pollution during PCB Crushing[J]. Nonferrous Metals Engineering, 2017,7(3):93-95.
[9] Rohwerder T, Gehrke T, Kinzler K, et al. Bioleaching review part A:progress in bioleaching:fundamentals andmecha-nisms of bacterial metal sulfide oxidation[J]. Applied Microb-iology and Biotechnology, 2013,63(3):239-248.
[10] 费彦肖.碳纳米材料修饰电极对A.f菌浸出废PCB中铜的催化作用研究[D]. 上海:上海第二工业大学, 2015. Fei Y Y. The The Research of carbon nano-materials cathode in leaching copper from PCB with A.f bacterials[D]. Shanghai:Shang hai Polytechnic University, 2015.
[11] 徐丹丹.NCNTs修饰电极对A.f菌浸出废锂离子电池中金属的影响[D]. 上海:上海第二工业大学, 2017. Xu D D. The Research of Carbon Nano-materials Cathode in leaching metal from lithium-ion batteries with A.f bacterials[D]. Shang hai:Shang hai Polytechnic University, 2015.
[12] Weihua Gu, Jianfeng Bai, Bin Dong, et al. Enhanced bioleaching effificiency of copper from waste printed circuit board driven by nitrogen-doped carbon nanotubes modifified electrode[J]. Chemical Engineering Journal, 2017,324:122-129.
[13] Weihua Gu, Jianfeng Bai, Bin Dong, et al. Catalytic effffect of graphene in bioleaching copper from waste printed circuit boards by Acidithiobacillus ferrooxidans[J]. Hydrometallurgy, 2017,171:172-178.
[14] Bai Jianfeng, Gu Weihua, Dai Jue, et al. The catalytic role of nitrogen doped carbon nanotubes in bioleaching copper from waste printed circuit boards[J]. Polish Journal Of Environmental studies, 2016,25(3):951-957.
[15] 傅开彬,陈海焱,谌书,等.微生物在废弃印刷线路板资源化中的应用研究进展[J]. 金属矿山, 2016,475:176-178. Fu K B, Chen H Y, Chen S, et al. Application research status of bacteria in recycling waste printed circuit boards[D]. METAL MINE, 2016,475:176-178.
[16] 李翰林,李茹.氧化亚铁硫杆菌的生长特性及驯化[J]. 西安工程大学学报, 2017,31(1):41-45. Li H L, Li R. Study on the growth Characteristic and domestication of Thiobacillus ferrooxidans[D]. Journal of Xi'an Polytechnic University, 2017,31(1):41-45.