Method for Efficient Recovery of High-Purity Polycarbonates from Electronic Waste

2015 ◽  
Vol 49 (4) ◽  
pp. 2425-2433 ◽  
Author(s):  
George S. Weeden ◽  
Nicholas H. Soepriatna ◽  
Nien-Hwa Linda Wang
Keyword(s):  
High Purity ◽  
Electronic Waste ◽  
Efficient Recovery

Indium recovery from waste liquid crystal displays by polyvinyl chloride waste

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102836-102843 ◽  
Author(s):  
Jie Guan ◽  
Shuai Wang ◽  
Haohua Ren ◽  
Yaoguang Guo ◽  
Hao Yuan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polyvinyl Chloride ◽  
High Purity ◽  
Liquid Crystal Displays ◽  
Efficient Recovery

An efficient recovery of high purity indium from waste LCDs was achieved via PVC waste.

Efficient recovery of high-purity aniline from aqueous solutions using pervaporation-fractional condensation system

AIChE Journal ◽  
2015 ◽  
Vol 61 (12) ◽  
pp. 4445-4455 ◽  
Author(s):  
Chuncheng Li ◽  
Xinru Zhang ◽  
Xiaogang Hao ◽  
Minmin Wang ◽  
Chuan Ding ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
High Purity ◽  
Fractional Condensation ◽  
Efficient Recovery

Highly efficient recovery of high-purity Cu, PVC, and phthalate plasticizer from waste wire harnesses through PVC swelling and rod milling

2020 ◽  
Vol 5 (9) ◽  
pp. 1805-1813
Author(s):  
Harendra Kumar ◽  
Shogo Kumagai ◽  
Tomohito Kameda ◽  
Yuko Saito ◽  
Toshiaki Yoshioka
Keyword(s):  
High Purity ◽  
Highly Efficient ◽  
Phthalate Plasticizer ◽  
Efficient Recovery

Schematic pathways of dry and wet rod milling processes.

Effective recovery of acids from iron-based electrolytes using graphene oxide membrane filters

2014 ◽  
Vol 2 (21) ◽  
pp. 7734-7737 ◽  
Author(s):  
Pengzhan Sun ◽  
Kunlin Wang ◽  
Jinquan Wei ◽  
Minlin Zhong ◽  
Dehai Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Membrane Transport ◽  
Anion Exchange ◽  
High Purity ◽  
Anion Exchange Membranes ◽  
Membrane Filters ◽  
Iron Based ◽  
Efficient Recovery ◽  
Diffusion Dialysis ◽  
Oxide Membrane

Efficient recovery of acids from iron-based electrolytes using GO membranes was demonstrated. The trans-membrane transport of H+ was two orders of magnitude greater than that of Fe3+. The circular penetration of iron-based electrolytes could produce acids with high purity, which was superior to other traditional diffusion dialysis processes conducted by polymer-based anion-exchange membranes.

scholarly journals The Life Cycle Performance Assessment (LCPA) Methodology

2021 ◽  
pp. 81-96
Author(s):  
Reinhard Ahlers
Keyword(s):  
Life Cycle ◽  
Performance Assessment ◽  
Mobile Phones ◽  
Business Models ◽  
Electronic Waste ◽  
Cycle Performance ◽  
New Materials ◽  
Logistic Chain ◽  
Efficient Recovery ◽  
Future Business

AbstractThe FENIX project has started to develop future business models for the efficient recovery of secondary resources. It would not be enough just to improve business models based on traditional linear approaches. Rather, new approaches must be developed with a particular focus on environmental and climate changes. Electronic scrap is no longer scrap, but must be seen as valuable material. Using the mobile phone as an example, FENIX has developed technologies to get recyclable materials out of scrapped mobile phones and to process them into new materials and final products. The developed technological approaches are not limited to mobile phones, but can be used for all types of electronic waste. FENIX has only focused on the logistic chain from the dismantling of the cell phones to the manufacturing of new materials and products (recycling chain). This, of course, involves a lot of effort in dismantling the e-waste, as the recycling process was not yet considered when developing the products currently on the market. Such eco-design approaches would certainly reduce the disassembly effort in the future. FENIX business models should not only be based on economic success but also consider ecological effects at the same time. Therefore, an accompanying Life Cycle Performance Assessment (LCPA) has been carried out to prove the advantages of the developed business models. From the interim assessment, recommendations for further technical development directions were repeatedly given to achieve the best possible economic and ecological solutions.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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.

TEM characterization of WSix films

1994 ◽  
Vol 52 ◽  
pp. 848-849
Author(s):  
V. C. Kannan ◽  
S. M. Merchant ◽  
R. B. Irwin ◽  
A. K. Nanda ◽  
M. Sundahl ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Vapor Deposition ◽  
High Purity ◽  
Physical Vapor Deposition ◽  
Thermal Treatments ◽  
Rapid Thermal Anneal ◽  
Tungsten Silicide ◽  
Tem Characterization ◽  
Metal Silicides

Metal silicides such as WSi2, MoSi2, TiSi2, TaSi2 and CoSi2 have received wide attention in recent years for semiconductor applications in integrated circuits. In this study, we describe the microstructures of WSix films deposited on SiO2 (oxide) and polysilicon (poly) surfaces on Si wafers afterdeposition and rapid thermal anneal (RTA) at several temperatures. The stoichiometry of WSix films was confirmed by Rutherford Backscattering Spectroscopy (RBS). A correlation between the observed microstructure and measured sheet resistance of the films was also obtained.WSix films were deposited by physical vapor deposition (PVD) using magnetron sputteringin a Varian 3180. A high purity tungsten silicide target with a Si:W ratio of 2.85 was used. Films deposited on oxide or poly substrates gave rise to a Si:W ratio of 2.65 as observed by RBS. To simulatethe thermal treatments of subsequent processing procedures, wafers with tungsten silicide films were subjected to RTA (AG Associates Heatpulse 4108) in a N2 ambient for 60 seconds at temperatures ranging from 700° to 1000°C.

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