Studies on copper(II) leaching from e-waste with hydrogen sulfate ionic liquids: Effect of hydrogen peroxide

Wstawski, Szymon; Emmons-Burzyńska, Magdalena; Rzelewska-Piekut, Martyna; Skrzypczak, Andrzej; Regel‐Rosocka, Magdalena

doi:10.1016/j.hydromet.2021.105730

Cited by 14 publications

(13 citation statements)

References 37 publications

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“…A large amount of Cu(II) (approximately 550 mg on average) was leached from e-waste by [HSO 4 − ] ILs using a 0.5 M leaching solution with the addition of H 2 O 2 , and the concentration of Cu(II) was approximately 10 mg/dm 3 . 30 A process for leaching copper (86.2%), cobalt (99.5%), gold (40.8%), and silver (44.6%) from printed circuit boards using imidazolium-cation-based ILs ([Bmim]HSO 4 , [Hmim]HSO 4 , [Bmim]Cl, and [Bmim]Br) was also reported for the first time. 31 ] at a ratio of 50 mg•mL −1 and stirring at 300 rpm at 22.5 °C, the palladium concentration was selectively recovered to 58 ppm after 2 h. 32 Notably, ILs can be regenerated and reused, and their use is considered an environmentally friendly method for recovering metals from ewaste.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen sulfate [HSO 4 − ] ILs were used as novel solvents in a leaching system to recover valuable copper metal from printed‐circuit‐board waste. A large amount of Cu(II) (approximately 550 mg on average) was leached from e‐waste by [HSO 4 − ] ILs using a 0.5 M leaching solution with the addition of H 2 O 2 , and the concentration of Cu(II) was approximately 10 mg/dm 3 30 . A process for leaching copper (86.2%), cobalt (99.5%), gold (40.8%), and silver (44.6%) from printed circuit boards using imidazolium‐cation‐based ILs ([Bmim]HSO 4 , [Hmim]HSO 4 , [Bmim]Cl, and [Bmim]Br) was also reported for the first time 31 .…”

Section: Introductionmentioning

confidence: 99%

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Environmentally friendly ionic liquid medium based on dicyanamide anion for leaching gold from e‐waste CPUs by iodination

Liu

Kou

Xing

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUD The large and growing amount of electronic waste (e‐waste) caused by the rise of the electronics industry has negatively impacted the environment and secondary resource utilization. Thus, research on the recovery, recycling, and reuse of valuable metals from e‐waste has attracted considerable attention. In this study, a novel leaching system based on dicyandiamide ionic liquids (ILs): 1‐ethyl‐3‐methylimidazolium dicyandiamide, 1‐butyl‐3‐methylimidazolium dicyandiamide, and 1‐hexyl‐3‐methylimidazolium dicyandiamide were used to evaluate the effectiveness of leaching gold from typical e‐waste CPUs by iodination. RESULTS The response surface experiment and analysis of variance (ANOVA) for the results showed that the optimal gold leaching efficiency reached 93.81% after 170 min under a rotational speed of 300 rpm, temperature of 32 °C, and iodine dosage of 1.15%. The mechanism of reaction was determined and the main reaction products were Au[IN(CN)2]− and Au[N(CN)2]2−. Moreover, the kinetic behavior of gold leaching showed a good correlation with the Avrami model and the activation energy value was 14.01 kJ·mol−1. The comparison of iodine consumption between aqueous medium and ILs showed that the required amount of iodine (calculated by ionic iodine) decreased by a factor of six times in ILs. CONCLUSION The iodine dosage, leaching temperature, and time had significant effects on the gold leaching efficiency in the IL leaching system. The reaction of gold leaching was jointly controlled by diffusion and chemical reactions. The coordination groups [N(CN)2]22− and [IN(CN)2]2− in the pregnant solution formed stable complexes with Au(I). The consumption of iodine in ILs decreased remarkably, showing the significant practical value of ILs. © 2022 Society of Chemical Industry (SCI).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Environmentally friendly ionic liquid medium based on dicyanamide anion for leaching gold from e‐waste CPUs by iodination

Liu

Kou

Xing

et al. 2022

J of Chemical Tech & Biotech

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“…Sulfide ores and Cu oxides are the primary sources of Cu [1]. Cu is widely used in building and construction, power generation, industrial machinery and equipment, transport equipment, and general consumer items [2], especially electrical and electronic devices. Consequently, copper production has been increased from over 600 thousand tons in 2010 to over 850 million metric tons in 2021, an annual average growth rate of over 4 percent [3].…”

Section: Introductionmentioning

confidence: 99%

Selective Chelating Resin for Copper Removal and Recovery in Aqueous Acidic Solution Generated from Synthetic Copper-Citrate Complexes from Bioleaching of E-waste

Suwannahong

Sripirom

Sirilamduan

et al. 2022

Adsorption Science & Technology

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This research focused on batch experiment using a new generation of chelating resins via an ion exchange process to describe the metabolic adsorption and desorption capacity onto iminodiacetic acid/Chelex 100, bis-pyridylmethyl amine/Dowex m4195, and aminomethyl phosphonic/Lewatit TP260 functional groups in bioleaching. The results showed that Dowex m4195 had the highest performance of adsorption capacity for copper removal in both H+-form and Na+-form. Results for Lewatit TP260 and Chelex 100 revealed lower adsorption performance than results for Dowex m4195. The investigation of desorption from chelating resins was carried out, and it was found that 2 M ammonium hydroxide concentration provided the best desorption capacity of about 64.86% for the H+-form Dowex m4195 followed by 52.55% with 2 M sulfuric acid. Lewatit with 2 M hydrochloric acid gave the best desorption performance in Na+-form while Chelex 100 using hydrochloric at 1 M and 2 M provided similar results in terms of the H+-form and Na+-form. As aspects of the selective chelating resins for copper (II) ions in aqueous acidic solution generated from synthetic copper-citrate complexes from bioleaching of e-waste were considered, H+-form Dowex m4195 was a good performer in adsorption using ammonium hydroxide for the desorption. However, chelating resins used were subsequently reused for more than five cycles with an acidic and basic solution. It can be concluded from these results that selective chelating resins could be used as an alternative for the treatment of copper (II) ions contained in e-waste or application to other divalent metals in wastewater for sustainable water and adsorbent reuse as circular economy.

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“…Copper extraction at the level of 72 wt% from the “black mass” of waste Li-ion batteries was obtained using trihexyltetradecylphosphonium thiocyanate, [P 6,6,6,14 ][SCN] with the addition of H 2 O 2 and didecyldimethylammonium chloride surfactant, DDACl, as well as using Cyanex 272 with the addition of diethyl phosphite ester [ 9 ]. Extraction of copper from solid e-waste with hydrogen sulphate ammonium and imidazolium-based ILs, such as [N 1,1,8,H ][HSO 4 ] with the addition of H 2 O 2 at T = 348 K (1 h) was obtained at the level of 20–33 wt% [ 10 ]. 98% Extraction of copper from the solid phase was obtained with the use of bisulphate ILs: [BMIM][HSO 4 ], [PS-MIM][HSO 4 ], [CM-MIM][HSO 4 ], [di-Ac-IM][HSO 4 ], [C 6 (di-Ac-IM)[HSO 4 ]) with the addition of H 2 O 2 , after preliminary leaching with 1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM][BF 4 ] [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Metals from Electronic Waste-Printed Circuit Boards by Ionic Liquids, DESs and Organophosphorous-Based Acid Extraction

et al. 2022

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The extraction of metals from waste printed circuit boards (WPCBs) with ionic liquids (ILs), Deep Eutectic Solvents (DESs) and organophosphorous-based acid (Cyanex 272) has been presented. The study was undertaken to assess the effectiveness of the application of the new leaching liquids, and the new method of extraction of metals from the leachate and the solid phase with or without the leaching process. Solvent extraction from the liquid leachate phase has been studied in detail with popular ILs, such as tetraoctylphosphonium bromide, {[P8,8,8,8][Br] and tributyltetradecylphosphonium chloride, [P4,4,4,14][Cl] using Aqueous Biphasic Systems (ABS) method. Trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl) phosphinate, [P6,6,6,14][Cyanex272], ([P6,6,6,14][BTMPP]), trihexyltetradecylphosphonium thiocyanate, [P6,6,6,14][SCN], methyltrioctylammonium chloride (Aliquat 336), as well as bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) were also used in the extraction of metals from the leachate. Two DESs (1) {choline chloride + lactic acid, 1:2} and (2) {choline chloride + malonic acid, 1:1} were used in the extraction of metals from the solid phase. The extraction behavior of metals with DESs was compared with that performed with three new bi-functional ILs: didecyldimethylammonium salicylate, [N10,10,1,1][Sal], didecyldimethylammonium bis(2-ethylhexyl) phosphate, [N10,10,1,1][D2EHPA], and didecyldimethylammonium bis(2,4,4-trimethylpentyl) phosphinate, [N10,10,1,1][Cyanex272]. The [P6,6,6,14][Cyanex272]/toluene and (Cyanex 272 + diethyl phosphite ester) mixtures exhibited a high extraction efficiency of about 50–90% for different metal ions from the leachate. High extraction efficiency of about 90–100 wt% with the ABS method using the mixture {[P8,8,8,8][Br], or [P4,4,4,14][Cl] + NaCl + H2O2 + post-leaching liquid phase} was obtained. The DES 2 revealed the efficiency of copper extraction, ECu = 15.8 wt% and silver, EAg = 20.1 wt% at pH = 5 from the solid phase after the thermal pre-treatment and acid leaching. The solid phase extraction efficiency after thermal pre-treatment only was (ECu = 9.6 wt% and EAg = 14.2 wt%). The use of new bi-functional ILs did not improve the efficiency of the extraction of metal ions from the solid phase. Process factors such as solvent concentration, extraction additives, stripping and leaching methods, temperature, pH and liquid/solid as well as organic/water ratios were under control. For all the systems, the selectivity and distribution ratios were described. The proposed extraction processes can represent alternative paths in new technologies for recovering metals from electronic secondary waste.

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Studies on copper(II) leaching from e-waste with hydrogen sulfate ionic liquids: Effect of hydrogen peroxide

Cited by 14 publications

References 37 publications

Environmentally friendly ionic liquid medium based on dicyanamide anion for leaching gold from e‐waste CPUs by iodination

Environmentally friendly ionic liquid medium based on dicyanamide anion for leaching gold from e‐waste CPUs by iodination

Selective Chelating Resin for Copper Removal and Recovery in Aqueous Acidic Solution Generated from Synthetic Copper-Citrate Complexes from Bioleaching of E-waste

Recovery of Metals from Electronic Waste-Printed Circuit Boards by Ionic Liquids, DESs and Organophosphorous-Based Acid Extraction

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