Bioleaching of copper from waste printed circuit boards by bacterial consortium enriched from acid mine drainage

Xiang, Yun; Wu, Pingxiao; Zhu, Nengwu; Zhang, Ting; Wen, Liang; Wu, Jinhua; Li, Ping

doi:10.1016/j.jhazmat.2010.08.113

Cited by 220 publications

(111 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The EWM mass comprised of metals (32%), refractory oxides, ceramics and plastics. Similar results were reported in previous studies [1,17,18,19,20,21]. Untreated EWM contained mostly copper, base metals such as zinc, iron, lead and aluminium in significant proportions, and in lower concentration, gold, silver and other metals.…”

Section: Bioleaching Studiessupporting

confidence: 90%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

View full text Add to dashboard Cite

Technology of biorecovery by Bacillus megaterium to obtain gold as a complex of gold-cyanide from electronic waste material (EWM) was done. The bacteria were subjected to pretreatment and mutation. The exist metals in solution were dissolved via the pretreatment, that way, contest for the cyanide ion from other metals was reduced. The bacteria were subjected to mutation to be able grow at pH 9, 9.5 and 10, where the pKa of HCN is 9.3, thereby, the cyanide ion concentration available for bioleaching was increased by alkaline pH. The new mutated bacteria from the pretreated EWM at 0.5% pulp density obtained gold of 17, 25 and 21% at pH 9, 9.5 and 10, respectively. Whereas the old unmutated bacteria that grow at pH 7, recovered 11%. The outcomes demonstrated that effectiveness of the mutated alkaline bacteria (B. megaterium) in gold biorecovery was more than normal physiological (pH 7).

show abstract

Section: Bioleaching Studiessupporting

confidence: 90%

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

A.N.Z.¹

2018

AJMR

View full text Add to dashboard Cite

show abstract

“…Regarding copper recovery in the H 2 SO 4 system without presence of Fe 3+ ions only 9% of Cu dissolved. The positive influence of iron as an oxidative agent on copper bioleaching was also observed by other authors [14,19]. The highest metal extraction in the presence of Fe 3+ ions was also observed in the case of zinc (100%) dissolution [17].…”

Section: Metal Dissolution From Pcbssupporting

confidence: 72%

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Sedláková-Kaduková

Marcinčáková

Mražíková

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The role of iron in metal-bearing waste bioleaching was studied. Four various types of waste (printed circuit boards (PCBs), Ni-Cd batteries, alkaline batteries and Li-ion batteries) were treated by bioleaching using the acidophilic bacteria A. ferrooxidans and A. thiooxidans (separately or in mixture). Role of main leaching agents (Fe 3+ ions or sulphuric acid) was simulated in abiotic experiments. Results showed that oxidation abilities of Fe 3+ ions were crucial for recovery of Cu and Zn from PCBs, with the efficiencies of 88% and 100%, respectively. To recover 68% of Ni from PCBs, and 55% and 100% of Ni and Cd, respectively, from Ni-Cd batteries both oxidation action and hydrolysis of Fe 3+ were required. The importance of Fe 2+ ions as a reducing agent was showed in bioleaching of Co from Li-ion batteries and Mn from alkaline batteries. The efficiency of the processes has increased by 70% and 40% in Co and Mn bioleaching, respectively, in the presence of Fe 2+ ions. Based on the results we suggest the integrated biometallurgical model of metal-bearing waste recycling in the effort to develop zero-waste and less energy-dependent technologies.

show abstract

“…Bioleaching has been successfully applied for recovery of precious metals and copper from ores for many years. Despite, limited researches were carried out on the bioleaching of metals from electronic wastes but it has been demonstrated that using C. violaceum, gold can be microbially solubilized from PCB (Faramarzi et al, 2004) and using bacterial consortium enriched from natural acid mine drainage, copper could be efficiently solubilised from waste PCBs in about 5 days (Xiang et al, 2010). The extraction of copper was mainly accomplished indirectly through oxidation by ferric ions generated from ferrous ion oxidation bacteria; a two-step process was necessary for bacterial growth and for obtaining an appropriate oxidation rate of ferrous ion.…”

Section: Biometallurgymentioning

confidence: 99%

Recycling of Printed Circuit Boards

Luda¹

2011

Integrated Waste Management - Volume II

View full text Add to dashboard Cite

Bioleaching of copper from waste printed circuit boards by bacterial consortium enriched from acid mine drainage

Cited by 220 publications

References 38 publications

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Microbial Recovery of Gold Metal From Untreated and Pretreated Electronic Wastes by Wild and Mutated Cyanogenic <i>Bacillus megaterium</i>

Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling

Recycling of Printed Circuit Boards

Contact Info

Product

Resources

About