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Material flow analysis and energy requirements of mobile phone material recovery processes

An Erratum to this article was published on 18 October 2013

Abstract

Purpose

Proper recycling of mobile phones and other electronic products is important in order to reduce the generation of large amounts of hazardous waste, lessen environmental and social problems associated to the extraction of minerals and primary production of materials, and also minimize the depletion of scarce materials that are often difficult to substitute. Current material recovery processes are used to recycle electronic waste of various compositions.

Methods

Based on a review of the recycling processes and material flow analysis (MFA), we attribute the material and energy required to recover metals from 1 tonne of discarded mobile phones.

Results and discussion

We estimate that the recovery rates of gold, palladium, silver, copper, nickel, lead, antimony, and tin from the recycling processes described are 80 to 99 % (16.4 % of the phone in weight). The two main industrial processes used at present time (pyrometallurgical and combined pyro-hydrometallurgical) have similar energy consumptions (7,763 and 7,568 MJ/tonne of mobile phones, respectively). An average tonne of used mobile phones represents a potential of 128 kg of copper, 0.347 kg of gold, 0.15 kg of palladium, 3.63 kg of silver, 15 kg of nickel, 6 kg of lead, 1 kg of antimony, and 10 kg of tin as well as other metals that are not yet profitable to recover but might be in the future.

Conclusions

We find that the energy consumed to recover copper from mobile phones is half of that needed for copper primary extraction and similar or greater energy savings for precious metal refining. Nevertheless, only 2.5 % of mobile phones arrive to industrial recovery facilities. There is a great potential to increase the amount of metals being recovered, thereby reducing energy consumption and increasing resource efficiency.

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Notes

  1. A total of 7,431 MJ/tonne is necessary for smelting and refining 1 tonne of shredded mobile waste (Hagelüken 2007) of which 19 % is attributed to the smelting phase and 81 % to the rest of the refining processes (based on ratio provided by Meskers et al. (2009) given for e-scrap).

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Correspondence to Gara Villalba Méndez.

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Responsible editor: Adriana Del Borghi

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Valero Navazo, J.M., Villalba Méndez, G. & Talens Peiró, L. Material flow analysis and energy requirements of mobile phone material recovery processes. Int J Life Cycle Assess 19, 567–579 (2014). https://doi.org/10.1007/s11367-013-0653-6

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Keywords

  • Electronic waste
  • Material flow analysis
  • Mobile phone recycling