Bioleaching of rare earth elements from spent automobile catalyst as pretreatment method to improve Pt and Pd recovery: process optimization and kinetic study

2021 ◽  
Author(s):  
Fariba Hosseinzadeh ◽  
Seyed Omid Rastegar ◽  
Morahem Ashengroph
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Kinetic Study ◽  
Process Optimization ◽  
Recovery Process ◽  
Pretreatment Method

Process optimization for acidic leaching of rare earth elements (REE) from waste electrical and electronic equipment (WEEE)

2021 ◽  
Author(s):  
Ayse Yuksekdag ◽  
Borte Kose-Mutlu ◽  
Bihter Zeytuncu-Gokoglu ◽  
Mustafa Kumral ◽  
Mark R. Wiesner ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Process Optimization ◽  
Electronic Equipment

Biorecovery of Rare Earth Elements: Potential Application for Mine Water Remediation

2015 ◽  
Vol 1130 ◽  
pp. 543-546 ◽  
Author(s):  
A.J. Murray ◽  
Sarah Singh ◽  
M.R. Tolley ◽  
L.E. Macaskie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Inorganic Phosphate ◽  
Large Scale ◽  
Recovery Process ◽  
Bacterial Biofilm ◽  
Water Remediation ◽  
Complex Nature ◽  
Secondary Sources ◽  
Phosphate Source

Rare earth elements (REEs) are highly valuable due to the complex nature of their extraction from primary and secondary sources. A key feature is that REEs often co-occur with uranium and thorium which, being radioactive, increase the hazard and complexity of REE recovery. A bioprocess which utilizes enzymatically-generated inorganic phosphate to precipitate REEs from solution as their phosphate biominerals is highly effective in the recovery of REEs, effecting rapid recovery onto immobilized bacterial biofilm at high flow-through rates. This also bioprecipitates U and Th. The metal recovery process requires addition of an organic phosphate substrate, e.g. glycerol 2-phosphate (G2P), the cleavage of which provides the inorganic phosphate source for REE biomineralization. G2P is expensive, precluding its large scale use, but early work using uranium showed that tributyl phosphate (TBP) can be used as an alternative phosphate donor molecule. The potential for substitution of G2P by TBP for biorecovery of neodymium is described and a new approach is proposed for enhancing the metal selectivity for REEs against uranium.

Environmental and Economic Assessment of a Portable E-Waste Recycling and Rare Earth Elements Recovery Process

2021 ◽  
Author(s):  
Emmanuel Ohene Opare ◽  
Amin Mirkouei
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Large Scale ◽  
Electronic Waste ◽  
Electronic Devices ◽  
Economic Assessment ◽  
Recovery Process ◽  
Waste Recycling ◽  
High Tech ◽  
Regulatory Bodies

Abstract Over 40 million tons of electronic devices (e.g., computers, laptops, notebooks, and cell phones) became obsolete in 2020, and this estimate is expected to grow exponentially, mainly due to the decreasing lifespan of electronics. Most of the electronics replaced end up in municipal landfills. Electronic waste (e-waste) has raised concerns because many components in these products are not biodegradable and are toxic. Some of the toxic materials and chemicals include rare earth elements (REEs), which are currently experiencing supply constraints. This study focuses on generated e-wastes from households due to the high amount of these wastes. Technologies for e-waste mining must be tailored to household needs rather than large-scale industrial processes. The use of portable e-waste recovery systems may produce win-win outcomes where industry, households, and regulatory bodies could benefit, and this will incentivize e-waste mining for all stakeholders. This study investigates the sustainability benefits of employing a portable e-waste recycling and REEs recovery, using techno-economic and life cycle assessment methods. The results indicate that the proposed approach in this study mitigates environmental impacts when maleic acid is used as one of the key ingredients in recovering and separating REEs and other metals. It is concluded that when adopted globally, this technology can significantly address the e-waste challenge while improving the availability of REEs for high-tech applications.

scholarly journals Direct Recovery of the Rare Earth Elements Using a Silk Displaying a Metal-Recognizing Peptide

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 761
Author(s):  
Nobuhiro Ishida ◽  
Takaaki Hatanaka ◽  
Yoichi Hosokawa ◽  
Katsura Kojima ◽  
Tetsuya Iizuka ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Industrial Wastewater ◽  
Recovery Process ◽  
Advanced Materials ◽  
Mixed Solution ◽  
Transgenic Silkworm ◽  
Additional Energy ◽  
Gene Coding ◽  
Recovery Approach

Rare earth elements (RE) are indispensable metallic resources in the production of advanced materials; hence, a cost- and energy-effective recovery process is required to meet the rapidly increasing RE demand. Here, we propose an artificial RE recovery approach that uses a functional silk displaying a RE-recognizing peptide. Using the piggyBac system, we constructed a transgenic silkworm in which one or two copies of the gene coding for the RE-recognizing peptide (Lamp1) was fused with that of the fibroin L (FibL) protein. The purified FibL-Lamp1 fusion protein from the transgenic silkworm was able to recognize dysprosium (Dy3+), a RE, under physiological conditions. This method can also be used with silk from which sericin has been removed. Furthermore, the Dy-recovery ability of this silk was significantly improved by crushing the silk. Our simple approach is expected to facilitate the direct recovery of RE from an actual mixed solution of metal ions, such as seawater and industrial wastewater, under mild conditions without additional energy input.

scholarly journals Hydrometallurgical Recovery and Process Optimization of Rare Earth Fluorides from Recycled Magnets

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 340 ◽  
Author(s):  
Prince Sarfo ◽  
Thomas Frasz ◽  
Avimanyu Das ◽  
Courtney Young
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Process Optimization ◽  
Ammonium Hydroxide ◽  
Environmental Issues ◽  
Recovery Process ◽  
Response Model ◽  
Unique Approach ◽  
Ammonium Jarosite ◽  
Rare Earth Fluorides

Magnets containing substantial quantities of rare earth elements are currently one of the most sought-after commodities because of their strategic importance. Recycling these rare earth magnets after their life span has been identified to be a unique approach for mitigating environmental issues that originate from mining and also for sustaining natural resources. The approach is hydrometallurgical, with leaching and precipitation followed by separation and recovery of neodymium (Nd), praseodymium (Pr) and dysprosium (Dy) in the form of rare earth fluorides (REF) as the final product. The methodology is specifically comprised of sulfuric acid (H2SO4) leaching and ammonium hydroxide (NH4OH) precipitation followed by reacting the filtrate with ammonium bifluoride (NH4F·HF) to yield the REF. Additional filtering also produces ammonium sulfate ((NH4)2SO4) as a byproduct fertilizer. Quantitative and qualitative evaluations by means of XRD, ICP and TGA-DSC to determine decomposition of ammonium jarosite, which is an impurity in the recovery process were performed. Additionally, conditional and response variables were used in a surface-response model to optimize REF production from end-of-life magnets. A REF recovery of 56.2% with a REF purity of 62.4% was found to be optimal.

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