Leaching of Electronic Waste Using Biometabolised Acids

Saidan, M; Brown, Bernadette; Valix, Marjorie

doi:10.1016/s1004-9541(11)60215-2

Cited by 61 publications

(35 citation statements)

References 16 publications

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“…Bioleaching is seen as one of the most promising technologies for the treatment and recovery of materials from WEEE [75], since it is considered to be a low-cost process, both in terms of its installation and operation, with low energy consumption and the use of non-toxic reagents [76].…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

“…Among them are soluble organic acids with a low molecular weight, which in addition to acidifying the environment also act as chelating agents, assisting in the solubilization of the metals [75,85]. The reactions involved in this metal dissolving process include the cathodic reduction reactions of hydrogen protons (Eq.…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

“…5.29) and the formation of stable complexes between the radical of the organic acid and the metal (Eqs. 5.30-5.32) [75].…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

“…Recent research has shown that the action of acids in the bioleaching process is of influence on the solubilization rate of the metal [75,87]. According to Saidan et al [75], in a pH of 2, bio-metabolized organic acids lead to a better dissolution of the copper coming from printed circuit boards than sulfuric acid, which is the result of bacterial action.…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

“…According to Saidan et al [75], in a pH of 2, bio-metabolized organic acids lead to a better dissolution of the copper coming from printed circuit boards than sulfuric acid, which is the result of bacterial action. In a pH lower than 1.5, sulfuric acid gives better results.…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

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Leaching Processes

Calgaro¹,

Tanabe²,

Bertuol³

et al. 2015

Electronic Waste

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When solid materials are exposed to a liquid, some constituents will dissolve to a greater or lesser extent. The degree of dissolution of individual constituents by the contacting liquid leads to a leachate/percolate or extract composition that can be of interest for different purposes [1], such as the extraction of metals from solid waste through a suitable leachant. Leaching is a step in hydro-and electrometallurgical processes and has been also employed for the recovery of metals from waste of electrical and electronic equipment (WEEE). The process may be preceded by a mechanical pretreatment of the waste (see Chap. 6) and followed by purification and metal recovery from the solution (see Chaps. 8 and 9). This chapter will discuss the different leaching solutions and conditions for WEEE processing.

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Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

“…5.29) and the formation of stable complexes between the radical of the organic acid and the metal (Eqs. 5.30-5.32) [75].…”

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

Section: Department Of Chemical Engineering Polytechnic School Univmentioning

confidence: 99%

See 3 more Smart Citations

Leaching Processes

Calgaro¹,

Tanabe²,

Bertuol³

et al. 2015

Electronic Waste

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Recycling of mixed cathode lithium‐ion batteries for electric vehicles: Current status and future outlook

et al. 2020

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Worldwide trends in mobile electrification, largely driven by the popularity of electric vehicles (EVs) will skyrocket demands for lithium‐ion battery (LIB) production. As such, up to four million metric tons of LIB waste from EV battery packs could be generated from 2015 to 2040. LIB recycling directly addresses concerns over long‐term economic strains due to the uneven geographic distribution of resources (especially for Co and Li) and environmental issues associated with both landfilling and raw material extraction. However, LIB recycling infrastructure has not been widely adopted, and current facilities are mostly focused on Co recovery for economic gains. This incentive will decline due to shifting market trends from LiCoO2 toward cobalt‐deficient and mixed‐metal cathodes (eg, LiNi1/3Mn1/3Co1/3O2). Thus, this review covers recycling strategies to recover metals in mixed‐metal LIB cathodes and comingled scrap comprising different chemistries. As such, hydrometallurgical processes can meet this criterion, while also requiring a low environmental footprint and energy consumption compared to pyrometallurgy. Following pretreatment to separate the cathode from other battery components, the active material is dissolved entirely by reductive acid leaching. A complex leachate is generated, comprising cathode metals (Li+, Ni2+, Mn2+, and Co2+) and impurities (Fe3+, Al3+, and Cu2+) from the current collectors and battery casing, which can be separated and purified using a series of selective precipitation and/or solvent extraction steps. Alternatively, the cathode can be resynthesized directly from the leachate.

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