| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Salmi, Ari
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2023Preventing Formation of Metal Dendrites During Electroplating Using External Ultrasonic Actuatorscitations
- 2023Evaluation of bone growth around bioactive glass S53P4 by scanning acoustic microscopy co-registered with optical interferometry and elemental analysiscitations
- 20234D Scanning Acoustic Microscopy
- 2023Ultrasound-based surface sampling in immersion for mass spectrometrycitations
- 2022Coupling Power Ultrasound into Industrial Pipe Walls
- 2022Preventing Formation of Metal Dendrites During Electroplating Using External Ultrasonic Actuatorscitations
- 2022FEM-based time-reversal technique for an ultrasonic cleaning applicationcitations
- 2022CESAM - Coded excitation scanning acoustic microscopecitations
- 2022Identifying Regions-of-Interest and Extracting Gold from PCBs Using MHz HIFUcitations
- 20224D Scanning Acoustic Microscopy
- 2021CESAM - Coded excitation scanning acoustic microscopecitations
- 2021FEM-based time-reversal enhanced ultrasonic cleaningcitations
- 2019Coded Acoustic Microscopy to Study Wood Mechanics and Developmentcitations
- 2019Digital Eyewearcitations
- 2018Detecting Industrial Fouling by Monotonicity during Ultrasonic Cleaningcitations
- 2013Cyclic impulsive compression loading along the radial and tangential wood directions causes localized fatiguecitations
- 2008Crystallization and shear modulus of a forming biopolymer film determined by in situ x-ray diffraction and ultrasound reflection methodscitations
- 2006Measuring in-plane mechanical properties of plate-like samples using phonographic pickupscitations
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document
Identifying Regions-of-Interest and Extracting Gold from PCBs Using MHz HIFU
Abstract
Increased digitalization and technological development raises the demand for rare and precious metals (RPM). Due to their rarity, mining RPMs from the earth is becoming increasingly difficult. Traditional urban mining methods to recover RPMs from printed circuit boards (PCB) need to separate the RPMs from non-metallic substances, e.g. plastic. This separation requires toxic substances and causes unwanted and toxic by-products and emissions. The ability to identify regions-of-interest on PCBs, i.e. the gold pads, and to extract RPMs from only the desired areas would reduce the need for toxic substances. In this study, a single 12 MHz high-intensity focused-ultrasound transducer was used to 1) image a PCB to locate the gold pads, and 2) to subsequently induce inertial cavitation to remove gold from three extraction areas on the selected gold pad. The sonication was performed in water without additional chemicals. Gold removal was verified by imaging the pad with a coded-excitation scanning acoustic microscope (<i>f<sub>c</sub></i> = 375 MHz). Average areas and volumes of the three extraction regions were <i>A</i> = (12.2 ± 0.5)·10<sup>3</sup> μm<sup>2</sup> and <i>V</i> = (18 ± 2)·10<sup>3</sup> μm<sup>3</sup>, respectively. The total amount of removed gold and nickel (from beneath the gold plating) from all three extraction areas was estimated to <i>m<sub>Au,tot</sub></i> = (570 ± 20) ng and <i>m<sub>Ni,tot</sub></i> = (440 ± 30) ng. This study constitutes a first step towards more environmentally friendly, non-toxic urban mining of RPMs.<br/>