Bioleaching for recovery of base and precious metals from electronic waste: A review

Research output: Contribution to journalArticle

Abstract

Due to the rapidly evolving sophistication of the economy, the worldwide production of electronic waste is increasing every year. A major reason for the rapid generation of e-waste is the high rate of obsolescence in the electronic market. This paper focuses on the recovery of base and precious metals from e-waste. In recent years, an alternative approach, i.e., green biological gold leaching, has been considered based on the combination of safer chemical knowledge and the use of microorganisms for metal mobilization from e-waste. Cyanogenic bacteria, such as Chromobacteriumviolaceum, Pseudomonas aeruginosa and Pseudomonas fluorescens, have the ability to produce hydrocyanide acid. This indirect process of using bacterial leaching to dissolve gold from minerals has achieved a highest recovery rate of 73.2% (w/w). To date, 2-step bioleaching processes applied to mobile printed circuit boards have successfully leached up to 98.5% (w/w) of Cu, while the recovery for gold is still relatively low level. Therefore, the use of the optimum conditions, the right mixed culture of bacteria, and the proper method will improve the metal recovery and efficiency in future.

Original languageEnglish
Pages (from-to)1935-1943
Number of pages9
JournalInternational Journal of Civil Engineering and Technology
Volume9
Issue number13
Publication statusPublished - 1 Dec 2018

Fingerprint

Bioleaching
Precious metals
Recovery
Gold
Leaching
Bacteria
Metal recovery
Obsolescence
Printed circuit boards
Microorganisms
Minerals
Acids
Electronic Waste
Metals

Keywords

  • Base Metals
  • Bioleaching
  • Electronic waste
  • Gold Recovery
  • Recycling Technology

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Civil and Structural Engineering
  • Building and Construction
  • Computer Networks and Communications

Cite this

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abstract = "Due to the rapidly evolving sophistication of the economy, the worldwide production of electronic waste is increasing every year. A major reason for the rapid generation of e-waste is the high rate of obsolescence in the electronic market. This paper focuses on the recovery of base and precious metals from e-waste. In recent years, an alternative approach, i.e., green biological gold leaching, has been considered based on the combination of safer chemical knowledge and the use of microorganisms for metal mobilization from e-waste. Cyanogenic bacteria, such as Chromobacteriumviolaceum, Pseudomonas aeruginosa and Pseudomonas fluorescens, have the ability to produce hydrocyanide acid. This indirect process of using bacterial leaching to dissolve gold from minerals has achieved a highest recovery rate of 73.2{\%} (w/w). To date, 2-step bioleaching processes applied to mobile printed circuit boards have successfully leached up to 98.5{\%} (w/w) of Cu, while the recovery for gold is still relatively low level. Therefore, the use of the optimum conditions, the right mixed culture of bacteria, and the proper method will improve the metal recovery and efficiency in future.",
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AU - Sharil, Suraya

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AB - Due to the rapidly evolving sophistication of the economy, the worldwide production of electronic waste is increasing every year. A major reason for the rapid generation of e-waste is the high rate of obsolescence in the electronic market. This paper focuses on the recovery of base and precious metals from e-waste. In recent years, an alternative approach, i.e., green biological gold leaching, has been considered based on the combination of safer chemical knowledge and the use of microorganisms for metal mobilization from e-waste. Cyanogenic bacteria, such as Chromobacteriumviolaceum, Pseudomonas aeruginosa and Pseudomonas fluorescens, have the ability to produce hydrocyanide acid. This indirect process of using bacterial leaching to dissolve gold from minerals has achieved a highest recovery rate of 73.2% (w/w). To date, 2-step bioleaching processes applied to mobile printed circuit boards have successfully leached up to 98.5% (w/w) of Cu, while the recovery for gold is still relatively low level. Therefore, the use of the optimum conditions, the right mixed culture of bacteria, and the proper method will improve the metal recovery and efficiency in future.

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