Bioleaching of critical metals from waste OLED touch screens using adapted acidophilic bacteria

The aim of the presented investigation was to describe seasonal changes of microbial community composition in situ in different biocenoses on historical sandstone of the Northern Pergola in the Museum of King John III’s Palace at Wilanow (Poland). The microbial biodiversity was analyzed by the application of Illumina-based next-generation sequencing methods. The metabarcoding analysis allowed for detecting lichenized fungi taxa with the clear domination of two genera: Lecania and Rhinocladiella. It was also observed that, during winter, the richness of fungal communities increased in the biocenoses dominated by lichens and mosses. The metabarcoding analysis showed 34 bacterial genera, with a clear domination of Sphingomonas spp. across almost all biocenoses. Acidophilic bacteria from Acidobacteriaceae and Acetobacteraceae families were also identified, and the results showed that a significant number of bacterial strains isolated during the summer displayed the ability to acidification in contrast to strains isolated in winter, when a large number of isolates displayed alkalizing activity. Other bacteria capable of nitrogen fixation and hydrocarbon utilization (including aromatic hydrocarbons) as well as halophilic microorganisms were also found. The diversity of organisms in the biofilm ensures its stability throughout the year despite the differences recorded between winter and summer.

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Recovery of Platinum from a Spent Automotive Catalyst through Chloride Leaching and Solvent Extraction

Recycling ◽

10.3390/recycling6020027 ◽

2021 ◽

Vol 6 (2) ◽

pp. 27

Author(s):

Ana Méndez ◽

Carlos A. Nogueira ◽

Ana Paula Paiva

Keyword(s):

Solvent Extraction ◽

Environmental Sustainability ◽

Catalytic Converter ◽

Reaction Times ◽

Model Solution ◽

Critical Metals ◽

Experimental Conditions ◽

Chloride Leaching ◽

Good Potential ◽

Hydrometallurgical Treatment

Considering economics and environmental sustainability, recycling of critical metals from end-of-life devices should be a priority. In this work the hydrometallurgical treatment of a spent automotive catalytic converter (SACC) using HCl with CaCl2 as a leaching medium, and solvent extraction (SX) with a thiodiglycolamide derivative, is reported. The aim was to develop a leaching scheme allowing high Pt recoveries and minimizing Al dissolution, facilitating the application of SX. The replacement of part of HCl by CaCl2 in the leaching step is viable, without compromising Pt recovery (in the range 75–85%), as found for the mixture 2 M CaCl2 + 8 M HCl when compared to 11.6 M HCl. All leaching media showed good potential to recover Ce, particularly for higher reaction times and temperatures. Regarding SX, results achieved with a model solution were promising, but SX for Pt separation from the real SACC solution did not work as expected. For the adopted experimental conditions, the tested thiodiglycolamide derivative in toluene revealed a very good loading performance for both Pt and Fe, but Fe removal and Pt stripping from the organic phases after contact with the SACC solution were not successfully accomplished. Hence, the reutilization of the organic solvent needs improvement.

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Evaluating critical metals contained in spintronic memory with a particular focus on Pt substitution for improved sustainability

Sustainable Materials and Technologies ◽

10.1016/j.susmat.2021.e00270 ◽

2021 ◽

Vol 28 ◽

pp. e00270

Author(s):

A. Palomino ◽

J. Marty ◽

S. Auffret ◽

I. Joumard ◽

R.C. Sousa ◽

...

Keyword(s):

Critical Metals

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Intelligent Agents and Networked Buttons Improve Free-Improvised Ensemble Music-Making on Touch-Screens

Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems ◽

10.1145/2858036.2858269 ◽

2016 ◽

Cited By ~ 4

Author(s):

Charles Martin ◽

Henry Gardner ◽

Ben Swift ◽

Michael Martin

Keyword(s):

Intelligent Agents ◽

Music Making ◽

Touch Screens

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Editorial for Special Issue “Critical Metals in Hydrothermal Ores: Resources, Recovery, and Challenges”

Minerals ◽

10.3390/min11030299 ◽

2021 ◽

Vol 11 (3) ◽

pp. 299

Author(s):

Lingli Zhou ◽

Hongrui Fan ◽

Thomas Ulrich

Keyword(s):

Technological Innovations ◽

Special Issue ◽

Critical Metals ◽

Continuous Growth ◽

Global Population

The consumption of resources has rapidly increased over the last few decades, driven by the continuous growth of the global population and technological innovations [...]

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Complex Concentrated Alloys for Substitution of Critical Raw Materials in Applications for Extreme Conditions

Materials ◽

10.3390/ma14051197 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1197

Author(s):

Dumitru Mitrica ◽

Ioana Cristina Badea ◽

Beatrice Adriana Serban ◽

Mihai Tudor Olaru ◽

Denisa Vonica ◽

...

Keyword(s):

Raw Materials ◽

Extreme Environment ◽

Extreme Conditions ◽

The European Union ◽

Critical Metals ◽

Research Directions ◽

Level Of Involvement ◽

General Evaluation ◽

Critical Metal ◽

Critical Raw Materials

The paper is proposing a mini-review on the capability of the new complex concentrated alloys (CCAs) to substitute or reduce the use of critical raw materials in applications for extreme conditions. Aspects regarding the regulations and expectations formulated by the European Union in the most recent reports on the critical raw materials were presented concisely. A general evaluation was performed on the CCAs concept and the research directions. The advantages of using critical metals for particular applications were presented to acknowledge the difficulty in the substitution of such elements with other materials. In order to establish the level of involvement of CCAs in the reduction of critical metal in extreme environment applications, a presentation was made of the previous achievements in the field and the potential for the reduction of critical metal content through the use of multi-component compositions.

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