Hydrometallurgical recovery of copper from complex mixtures of end-of-life shredded ICT products

Thermodynamic and kinetic features studies of polymetallic sulfide industrial waste nitric acid leaching were carried out. Elemental and phase composition of investigated raw material were studied with X-ray diffraction and electron microscopy methods. Calculations of the Gibbs energy change for the likely reactions of sulfide minerals with nitric acid were performed. In order to determine the most probable conditions of the sulfide industrial waste leaching in nitric acid, as well as the mutual influence of the produced pulp components on the performance of the process, the kinetics evaluation of multicomponent sulfide industrial waste in a nitric medium was studied using mathematical methods.

show abstract

“…This work is an extension of previous studies [7] in order to clarify, generalize and expand earlier results.…”

Section: Introductionmentioning

confidence: 52%

Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

Rogozhnikov¹,

Dizer²,

Shoppert³

2017

Kms

View full text Add to dashboard Cite

show abstract

“…According to our previous research, 21 the ICT waste is very complex and contains a range of metals, including copper, zinc, nickel, iron, aluminum, lead, tin, and precious metals (silver and gold), with significant amounts of sand, glass, ceramics, and plastics/polymers (see Figure A2 for a typical image). The typical composition of metals in the ICT waste is given in Table A1.…”

Section: Resultsmentioning

confidence: 99%

A Cleaner Process for Selective Recovery of Valuable Metals from Electronic Waste of Complex Mixtures of End-of-Life Electronic Products

Sun

Xiao

Sietsma

et al. 2015

Environ. Sci. Technol.

View full text Add to dashboard Cite

In recent years, recovery of metals from electronic waste within the European Union has become increasingly important due to potential supply risk of strategic raw material and environmental concerns. Electronic waste, especially a mixture of end-of-life electronic products from a variety of sources, is of inherently high complexity in composition, phase, and physiochemical properties. In this research, a closed-loop hydrometallurgical process was developed to recover valuable metals, i.e., copper and precious metals, from an industrially processed information and communication technology waste. A two-stage leaching design of this process was adopted in order to selectively extract copper and enrich precious metals. It was found that the recovery efficiency and extraction selectivity of copper both reached more than 95% by using ammonia-based leaching solutions. A new electrodeposition process has been proven feasible with 90% current efficiency during copper recovery, and the copper purity can reach 99.8 wt %. The residue from the first-stage leaching was screened into coarse and fine fractions. The coarse fraction was returned to be releached for further copper recovery. The fine fraction was treated in the second-stage leaching using sulfuric acid to further concentrate precious metals, which could achieve a 100% increase in their concentrations in the residue with negligible loss into the leaching solution. By a combination of different leaching steps and proper physical separation of light materials, this process can achieve closed-loop recycling of the waste with significant efficiency.

show abstract

“…Ammonia leaching is a mature technology that can recover up to 90% of the Cu and 70% of Zn in traditional WEEE recycling process [19]. It could potentially be added to the process here with little extra chemical cost, as the ammonia can be recovered during the electrotwinning of Cu.…”

Section: Leaching At Room Temperaturementioning

confidence: 99%

Recovery of Neodymium as (Na, Nd)(SO4)2 from the Ferrous Fraction of a General WEEE Shredder Stream

Peelman

Sietsma

Yang

2018

J. Sustain. Metall.

View full text Add to dashboard Cite

Neodymium is a critical element used in many high-tech applications. However, despite this, the EU is entirely dependent on China for its Nd supply. This has driven the EU to develop recycling strategies to recover its Nd from end-of-life (EoL) products and wastes, and establish a domestic supply. This paper proposes a process to recycle Nd from NdFeB magnet particles present in the ferrous fraction of shredded ''Waste Electrical and Electronic Equipment'' (WEEE), after physical upgrading. This WEEE fraction represents a waste stream that has not been previously considered a source of Nd. A threestep process was developed. First, the upgraded ferrous WEEE fraction is oxidized by means of water corrosion. Second, the oxidized WEEE is leached with diluted H 2 SO 4 to selectively extract Nd and other nonferrous elements. And finally, the leach liquor is treated with Na 2 SO 4 to precipitate the Nd as its double sulfate (Nd, Na)(SO 4 ) 2 . The oxidation process oxidizes 93% of the metallic iron to Fe(OH) 3 , leaving 7% of the iron unoxidized. The leaching process dissolves between 70 and 99% of the Nd, depending on the temperature and liquid/solid ratio (L/S); this is accompanied by an iron coextraction between 9 and 20%. The precipitation recovers 92% of the leached Nd. The purity of the obtained precipitates is dependent on the pH at which the precipitation takes place. A pH below 0.5 is required to prevent Fe contamination, and a pH below 0 reduces the Ca contamination to below 1 wt%. The developed process provides an effective and low-cost method to recycle Nd from a shredded WEEE stream with an overall Nd recovery of over 90%.Journal of Sustainable Metallurgy (2018) 4:276-287 https://doi.org/10.1007/s40831-018-0165-5( 0123456789().,-volV) (0123456789().,-volV) Journal of Sustainable Metallurgy (2018) 4:276-287 277

show abstract

Hydrometallurgical recovery of copper from complex mixtures of end-of-life shredded ICT products

Cited by 53 publications

References 6 publications

Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

A Cleaner Process for Selective Recovery of Valuable Metals from Electronic Waste of Complex Mixtures of End-of-Life Electronic Products

Recovery of Neodymium as (Na, Nd)(SO4)2 from the Ferrous Fraction of a General WEEE Shredder Stream

Contact Info

Product

Resources

About