Recycling of indium from waste LCD: A promising non-crushing leaching with the aid of ultrasonic wave

Zhang, Kaihua; Li, Bin; Wu, Yufeng; Wang, Wei; Li, Rubing; Zhang, Yinan; Zuo, Tao

doi:10.1016/j.wasman.2017.03.031

Cited by 76 publications

(39 citation statements)

References 38 publications

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“…The temperature of the solution then became steady at boiling point since the leaching system was carried out at atmospheric pressure. The electromagnetic field of microwave induced the convective motion of the boiling solution and promoted the percussion and the contact of hydrogen ions from the acid to dissolve metal ions . The leaching efficiency of Pb was very low, below 3%, and did not increase with time, since the dissolved Pb ions could react with SO 4 2− from leaching agent to form PbSO 4 precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…The equilibrium condition was reached more rapidly in microwave‐assisted leaching due to direct microwave radiation absorption of acid leaching agent by ionic conductance and dipole rotation mechanisms . Microwave‐assisted leaching is recommended for leaching process of REEs in consideration of the rapid energy input . In addition, advantages of the atmospheric pressure microwave‐assisted leaching included effective gas‐forming handling, incremental reagents addition during the process, handling of the larger and dynamic sample sizes and various kind of sample vial .…”

Section: Resultsmentioning

confidence: 99%

“…The electromagnetic field of microwave induced the convective motion of the boiling solution and promoted the percussion and the contact of hydrogen ions from the acid to dissolve metal ions. [29][30][31] The leaching efficiency of Pb was very low, below 3%, and did not increase with time, since the dissolved Pb ions could react with SO 4 2− from leaching agent to form PbSO 4 precipitates. The leaching of Eu from waste CRT phosphor was completed in 60 min, while the leaching efficiency of Y was 78.07% and kept increasing slightly with time and reached 89.07% in 90 min.…”

Section: Leaching Kineticsmentioning

confidence: 99%

“…45 Microwave-assisted leaching is recommended for leaching process of REEs in consideration of the rapid energy input. 29 In addition, advantages of the atmospheric pressure microwave-assisted leaching included effective gas-forming handling, incremental reagents addition during the process, handling of the larger and dynamic sample sizes and various kind of sample vial. 39 Since the leaching suspension was at boiling condition throughout most of the leaching time, it is possible to modify the current operation mode to decrease energy requirement.…”

Section: Conventional Leachingmentioning

confidence: 99%

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Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Lie

Ismadji

Liu

2019

J of Chemical Tech & Biotech

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BACKGROUND Phosphor in discarded cathode ray tube (CRT) contained valuable metals, yttrium (Y) and europium (Eu), which are categorized as technology‐critical elements (TCEs) in terms of their supply risk and importance in emerging technologies. Microwave‐assisted leaching was applied to recover Y and Eu from waste CRT with sulfuric acid (H2SO4) solution as the leaching agent in the current study. It is aimed to develop an alternative leaching method of valuable metals from waste CRT phosphor. RESULTS The effects of microwave power and acid concentration on leaching efficiency of Y and Eu were investigated. Shrinking‐core model could describe the leaching kinetics of Y and Eu well and it was controlled by chemical reaction and diffusion through the product layer. Higher leaching efficiency was found when microwave power increased from 200 to 600 W, and was also found as acid concentration increased from 0.5 to 2 mol L−1. Leaching efficiency of Y and Eu were 78.07% and 100%, respectively, for Y and Eu within 60 min at microwave power of 400 W, using 2 mol L−1 of H2SO4 at 10 g L−1 of solid to liquid ratio. Compared with conventional leaching, microwave‐assisted leaching is an alternative technology that could shorten reaction time significantly. CONCLUSIONS The concentration of acid and microwave power affected microwave‐assisted leaching of Y and Eu from waste CRT phosphor. Microwave‐assisted leaching could be an alternative process for rare earth elements recovery. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Leaching Kineticsmentioning

confidence: 99%

Section: Conventional Leachingmentioning

confidence: 99%

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Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Lie

Ismadji

Liu

2019

J of Chemical Tech & Biotech

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“…193 Após a separação das lâminas de uma tela de LCD (Figura 8), a lâmina contendo ITO pode ser triturada ou não antes do processamento químico. 190,[194][195][196] Um método de lixiviação sem trituramento se baseia na lixiviação com HCl sob aplicação de ondas ultrassônicas Os resultados demonstraram que o índio pode ser lixiviado eficientemente mesmo sob baixa concentração de ácido clorídrico (0,8 mol L -1 ) (> 95 % em 1 h) sob ondas ultrassônicas de 300 W. 190 Em outra proposta, a lâmina foi pulverizada através de um tratamento mecânico, e o material obtido foi lixiviado com uma mistura HCl:HNO3 sob ondas ultrassônicas, 195 com as misturas H2SO4 + H2O2, 191,196 HNO3 + HCl, 187 ou H2SO4 + HCl. 197 A aplicação de ultrassom apresenta diversas vantagens em relação ao processo de lixiviação tradicional, como cinética rápida e controlável, alto rendimento de extração de índio e estanho, possibilidade de recuperação seletiva desses dois metais e possibilidade de reciclar o vidro puro separadamente, evitando processos de separação adicionais.…”

Section: Telas De Lcdunclassified

Waste Electrical and Electronic Equipment: The Anthropocene Knocks on Our Door

Afonso

2018

Rev. Virtual Quim.

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This review describes the technological, environmental, socio-cultural, economical and health challenges due to the waste electrical and electronic equipment. The rate of production of this waste has reached scary levels in the last years, and the level of perception of the populations facing the challenges imposed for their management greatly varies from one country to another. Solutions for waste electrical and electronic equipment are extremely complex, from the establishment of an effective reverse logistics of used products and reverse manufacturing protocols, to the proposal of technologies capable of processing the components of the various electrical and electronic products. Printed circuit boards, cathode ray tubes and liquid crystal displays are the most difficult components to recycle due to their multi-component nature: although they contain high-added value elements in much larger amounts than those of primary sources, they also present metallic components and organic compounds that are highly toxic to health and lead to environmental impacts. Brazil has begun to pay attention to the problem of e-waste relatively recently. Despite ongoing initiatives, the country still has a long way to go until the establishment of a management system that covers all its stages and peculiarities, such as its territorial extension. Waste electrical and electronic equipment is one of the most eloquent symbols of Anthropocene.

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Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

2021

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Vanadium (V) and yttrium (Y) were extracted from coal fly ash by a leaching process utilizing sulfuric acid with assistance of ultrasonic and hydrogen peroxide. Response surface methodology was applied to optimize main factors including solid-to-liquid (S/L) ratio, H 2 SO 4 percentage, and H 2 O 2 percentage. Under optimal conditions recovery rates for V and Y were 100 % and 97 %, respectively. A modified shrinking core model to study the kinetic leaching showed that the mass diffusion step controlled the reaction rate. The enthalpies for V and Y recovery indicated that the process was endothermic. Gibbs energy for both metals was negative, i.e., the process was spontaneous. Field emission scanning electron microscopy was applied to determine the effects of acid concentration and ultrasound on the surface of coal fly ash. Results demonstrated that the leaching agent could degrade and diffuse to coal ash particles.

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Recycling of indium from waste LCD: A promising non-crushing leaching with the aid of ultrasonic wave

Cited by 76 publications

References 38 publications

Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Waste Electrical and Electronic Equipment: The Anthropocene Knocks on Our Door

Ultrasound‐Assisted Leaching of Vanadium and Yttrium from Coal Ash: Optimization, Kinetic and Thermodynamic Study

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