Fabrication of nano-sized copper powders in liquid media via high-energy electrical explosion method: Use of high purity copper recovered from waste jelly-filled cable as raw material

2016 ◽  
Vol 58 (2) ◽  
pp. 161-164 ◽  
Author(s):  
Sungkyu Lee ◽  
Dukhee Lee ◽  
Soo-Young Lee ◽  
Sung-Su Cho ◽  
Sunghyun Uhm
Keyword(s):  
High Purity ◽  
Electrical Explosion ◽  
High Energy ◽  
Raw Material ◽  
Liquid Media ◽  
Copper Powders ◽  
Explosion Method ◽  
Purity Copper

scholarly journals Characteristics and Processing of Hydrogen-Treated Copper Powders for EB-PBF Additive Manufacturing

2019 ◽  
Vol 9 (19) ◽  
pp. 3993 ◽  
Author(s):  
Christopher Ledford ◽  
Christopher Rock ◽  
Paul Carriere ◽  
Pedro Frigola ◽  
Diana Gamzina ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Grain Boundaries ◽  
Oxygen Content ◽  
Copper Powder ◽  
High Purity ◽  
High Speed ◽  
Track Width ◽  
Copper Powders ◽  
Initial Oxygen ◽  
Purity Copper

The fabrication of high purity copper using additive manufacturing has proven difficult because of oxidation of the powder feedstock. Here, we present work on the hydrogen heat treatment of copper powders for electron beam powder bed fusion (EB-PBF), in order to enable the fabrication of high purity copper components for applications such as accelerator components and vacuum electronic devices. Copper powder with varying initial oxygen contents were hydrogen heat-treated and characterized for their chemistry, morphology, and microstructure. Higher initial oxygen content powders were found to not only reduce surface oxides, but also reduce oxides along the grain boundaries and form trapped H2O vapor inside the particles. The trapped H2O vapor was verified by thermogravimetric analysis (TGA) and residual gas analysis (RGA) while melting. The mechanism of the H2O vapor escaping the particles was determined by in-situ SEM heated stage experiments, where the particles were observed to crack along the grain boundaries. To determine the effect of the EB-PBF processing on the H2O vapor, the thermal simulation and the validation of single melt track width wafers were conducted along with melting single layer discs for chemistry analysis. A high speed video of the EB-PBF melting was performed in order to determine the effect of the trapped H2O vapor on the melt pool. Finally, solid samples were fabricated from hydrogen-treated copper powder, where the final oxygen content measured ~50 wt. ppm, with a minimal residue hydrogen content, indicating the complete removal of trapped H2O vapor from the solid parts.

scholarly journals Possible ways of technogenic formations processing with zinc extraction from sulphide compounds

2019 ◽  
Vol 126 ◽  
pp. 00047
Author(s):  
Mikhail Mikheenkov ◽  
Oleg Sheshukov ◽  
Ilya Nekrasov
Keyword(s):  
Zinc Oxide ◽  
Phase Composition ◽  
High Purity ◽  
High Energy ◽  
Raw Material ◽  
Zinc Extraction ◽  
Sulfur Bond

Extraction of zinc from sulphide forms by pyrometallurgical methods is difficult due to the high energy of the “zinc-sulfur” bond. Theoretically justified and experimentally confirmed the possible methods of extracting zinc from such compounds by changing of raw material phase composition. The zinc oxide obtained by this way has high purity and does not require additional purification by hydrochemical methods.

Hydrogen reduction of copper bleed solution from an Indian copper smelter for producing high purity copper powders

2006 ◽  
Vol 84 (3-4) ◽  
pp. 218-224 ◽  
Author(s):  
Archana Agrawal ◽  
Sarita Kumari ◽  
D. Bagchi ◽  
V. Kumar ◽  
B.D. Pandey
Keyword(s):  
High Purity ◽  
Hydrogen Reduction ◽  
Copper Smelter ◽  
Copper Powders ◽  
Purity Copper

High-purity Ge x-ray detectors: Sensitivity factors and usefulness

1990 ◽  
Vol 48 (2) ◽  
pp. 548-548
Author(s):  
E. B. Steel
Keyword(s):  
High Purity ◽  
High Energy ◽  
Quantitative Chemical Analysis ◽  
Detector Performance ◽  
X Ray ◽  
Detector Sensitivity ◽  
Specimen Holder ◽  
Many Instruments ◽  
Charge Resolution ◽  
Sensitivity Factors

High Purity Germanium (HPGe) x-ray detectors are now commercially available for the analytical electron microscope (AEM). The detectors have superior efficiency at high x-ray energies and superior resolution compared to traditional lithium-drifted silicon [Si(Li)] detectors. However, just as for the Si(Li), the use of the HPGe detectors requires the determination of sensitivity factors for the quantitative chemical analysis of specimens in the AEM. Detector performance, including incomplete charge, resolution, and durability has been compared to a first generation detector. Sensitivity factors for many elements with atomic numbers 10 through 92 have been determined at 100, 200, and 300 keV. This data is compared to Si(Li) detector sensitivity factors.The overall sensitivity and utility of high energy K-lines are reviewed and discussed. Many instruments have one or more high energy K-line backgrounds that will affect specific analytes. One detector-instrument-specimen holder combination had a consistent Pb K-line background while another had a W K-line background.

High purity copper nanoparticles via sonoelectrochemical approach

2019 ◽  
Vol 6 (11) ◽  
pp. 115058 ◽  
Author(s):  
Muhammad Murtaza ◽  
Naveed Hussain ◽  
Huang Ya ◽  
Hui Wu
Keyword(s):  
Copper Nanoparticles ◽  
High Purity ◽  
Purity Copper

scholarly journals High Purity/Recovery Separation of Propylene from Propyne Using Anion Pillared Metal-Organic Framework: Application of Vacuum Swing Adsorption (VSA)

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 609
Author(s):  
Majeda Khraisheh ◽  
Fares AlMomani ◽  
Gavin Walker
Keyword(s):  
High Purity ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Raw Material ◽  
Strong Interactions ◽  
Step Cycle ◽  
Experimental Conditions ◽  
High Purity Grade ◽  
Trade Off ◽  
Vacuum Swing Adsorption

Propylene is one of the world’s most important basic olefin raw material used in the production of a vast array of polymers and other chemicals. The need for high purity grade of propylene is essential and traditionally achieved by the very energy-intensive cryogenic separation. In this study, a pillared inorganic anion SIF62− was used as a highly selective C3H4 due to the square grid pyrazine-based structure. Single gas adsorption revealed a very high C3H4 uptake value (3.32, 3.12, 2.97 and 2.43 mmol·g−1 at 300, 320, 340 and 360 K, respectively). The values for propylene for the same temperatures were 2.73, 2.64, 2.31 and 1.84 mmol·g−1, respectively. Experimental results were obtained for the two gases fitted using Langmuir and Toth models. The former had a varied degree of representation of the system with a better presentation of the adsorption of the propylene compared to the propyne system. The Toth model regression offered a better fit of the experimental data over the entire range of pressures. The representation and fitting of the models are important to estimate the energy in the form of the isosteric heats of adsorption (Qst), which were found to be 45 and 30 kJ·Kmol−1 for propyne and propylene, respectively. A Higher Qst value reveals strong interactions between the solid and the gas. The dynamic breakthrough for binary mixtures of C3H4/C3H6 (30:70 v/v)) were established. Heavier propylene molecules were eluted first from the column compared to the lighter propyne. Vacuum swing adsorption was best suited for the application of strongly bound materials in adsorbents. A six-step cycle was used for the recovery of high purity C3H4 and C3H6. The VSA system was tested with respect to changing blowdown time and purge time as well as energy requirements. It was found that the increase in purge time had an appositive effect on C3H6 recovery but reduced productivity and recovery. Accordingly, under the experimental conditions used in this study for VSA, the purge time of 600 s was considered a suitable trade-off time for purging. Recovery up to 99%, purity of 98.5% were achieved at a purge time of 600 s. Maximum achieved purity and recovery were 97.4% and 98.5% at 100 s blowdown time. Energy and power consumption varied between 63–70 kWh/ton at the range of purge and blowdown time used. The VSA offers a trade-off and cost-effective technology for the recovery and separation of olefins and paraffin at low pressure and high purity.

Sign in / Sign up

Export Citation Format

Share Document