Separation of palladium and silver from E-waste leachate: effect of nitric acid concentration on adsorption to Thiol scavenger

Rajahalme, Joona; Perämäki, Siiri; Väisänen, Ari

doi:10.1016/j.ceja.2022.100280

Cited by 10 publications

(2 citation statements)

References 36 publications

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“…The goal of this step is the selective extraction of silver over other metals. Many researchers have found that HNO 3 shows good performance in the selective dissolution of silver over tin and lead [29,[76][77][78]. After leaching, the samples were filtered and dried; subsequently, leaching experiments were conducted with glycine.…”

Section: Multivariate Design Of Experimentsmentioning

confidence: 99%

A Comprehensive and Sustainable Recycling Process for Different Types of Blended End-of-Life Solar Panels: Leaching and Recovery of Valuable Base and Precious Metals and/or Elements

Kavousi,

Alamdari

2023

Metals

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The production of photovoltaic modules is increasing to reduce greenhouse gas emissions. However, this results in a significant amount of waste at the end of their lifespan. Therefore, recycling these solar panels is important for environmental and economic reasons. However, collecting and separating crystalline silicon, cadmium telluride, and copper–indium–gallium–selenide panels can be challenging, especially in underdeveloped countries. The innovation in this work is the development of a process to recycle all solar panel waste. The dissolution of all metals through the leaching process is studied as the main step of the flowchart. In the first step of leaching, 98% of silver can be recovered by 0.5 M nitric acid. Then, the second and third step involves the use of glycine for base metal dissolution, followed by the leaching of valuable metals with hydrochloric acid. The effect of parameters such as the initial pH, acid concentration, solid/liquid ratio, and hydrogen peroxide concentration is studied. The results show that up to 100% of Cu, Pb, Sn, Zn, Cd, In, Ga, and Se can be recovered under optimal conditions. The optimal conditions for the dissolution of Cu, Zn, and Cd were a glycine concentration of 0.5 M, a temperature of 25 °C, a solid/liquid ratio of 10 gr/L, and 1% of hydrogen peroxide. The optimized glycine concentration for the leaching of lead and tin was 1.5 M. Indium and gallium were recovered at 100% by the use of 5 M hydrochloric acid, S/L ratio = 10 gr/L, and T = 45 °C. Separation of selenium and tellurium occurred using 0.5 M HCl at a temperature of 60 °C. Additionally, for the first time, a general outlook for the recycling of various end-of-life solar panels is suggested.

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Section: Multivariate Design Of Experimentsmentioning

confidence: 99%

A Comprehensive and Sustainable Recycling Process for Different Types of Blended End-of-Life Solar Panels: Leaching and Recovery of Valuable Base and Precious Metals and/or Elements

Kavousi,

Alamdari

2023

Metals

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“…At present, the common methods used to solve the problem of precious metal separation include pyrometallurgy like chlorination metallurgy and hydrometallurgy including leaching, selective precipitation, ion exchange, solvent extraction, , and so forth . For the separation of Ag and Pd in the leachate, there have been relevant studies, as shown Table , involving hydrometallurgy including chemical precipitation, solvent extraction, and adsorption and pyrometallurgy like chloride metallurgy . The traditional hydrometallurgical separation process often requires a large amount of chemical reagents and will produce waste liquid and residue that pollute the environment.…”

Section: Introductionmentioning

confidence: 99%

Selective Extraction of Silver and Palladium in Leachate Based on EDTA Complexation: Electrodeposition, Nucleation Mechanism, and Kinetic Analysis

Song

2022

ACS Sustainable Chem. Eng.

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The development of green recycling technology for precious metals such as Ag and Pd from secondary resources can prevent environmental pollution caused by improper disposal, and it can alleviate resource shortage and promote sustainable development. Ag and Pd often coexist in some solid waste. This study proposed the extraction of Ag and Pd stepwise from leachate through the green technology of potential-controlled electrodeposition, and the reduction potential difference of Ag and Pd in solution was increased based on EDTA (ethylenediaminetetraacetic acid) complexation. The electrochemical behavior of Ag + and Pd 2+ in solution was investigated. It was determined that the electrodeposition separation of Ag + and Pd 2+ can be achieved with a pH of 9 and an EDTA molar ratio of 1:1.5 in the solution. With sequential electrodeposition at 0 V and −0.7 V, 99.3% of Ag and 96.15% of Pd were recovered, respectively, and their purity was achieved 100%. Pd electrodeposition conformed to threedimensional instantaneous nucleation and growth mechanism analyzed with the Scharifker−Hills model. Compared with the EDTAfree environment, the diffusion coefficient of ions reduced, and the activation energy of Ag and Pd reduction reaction increased in the EDTA environment. This study provides an environmentally friendly and efficient method for precious metal recovery from secondary resources.

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Separation of Long-Lived 108mAg from 152Eu and 60Co Using Polyethylene Glycol Based Aqueous Two Phase Systems

2023

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Separation of palladium and silver from E-waste leachate: effect of nitric acid concentration on adsorption to Thiol scavenger

Cited by 10 publications

References 36 publications

A Comprehensive and Sustainable Recycling Process for Different Types of Blended End-of-Life Solar Panels: Leaching and Recovery of Valuable Base and Precious Metals and/or Elements

A Comprehensive and Sustainable Recycling Process for Different Types of Blended End-of-Life Solar Panels: Leaching and Recovery of Valuable Base and Precious Metals and/or Elements

Selective Extraction of Silver and Palladium in Leachate Based on EDTA Complexation: Electrodeposition, Nucleation Mechanism, and Kinetic Analysis

Separation of Long-Lived 108mAg from 152Eu and 60Co Using Polyethylene Glycol Based Aqueous Two Phase Systems

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