Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap

AbstractThe objective of this particular study was to recover valuable metals from waste plasma display panels using high energy ball milling with subsequent acid dissolution. Dissolution of milled (PDP) powder was studied in HCl, HNO3, and H2SO4acidic solutions. The effects of dissolution acid, temperature, time, and PDP scrap powder to acid ratio on the leaching process were investigated and the most favorable conditions were found: (1) valuable metals (In, Ag, Mg) were recovered from PDP powder in a mixture of concentrated hydrochloric acid (HCl:H2O = 50:50); (2) the optimal dissolution temperature and time for the valuable metals were found to be 60°C and 30 min, respectively; (3) the ideal PDP scrap powder to acid solution ratio was found to be 1:10. The proposed method was applied to the recovery of magnesium, silver, and indium with satisfactory results.

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High-energy ball milling of nonstoichiometric compounds

Uspekhi Fizicheskih Nauk ◽

10.3367/ufnr.2019.06.038581 ◽

2019 ◽

Vol 190 (04) ◽

pp. 371-395

Author(s):

Aleksandr I. Gusev

Keyword(s):

Ball Milling ◽

High Energy ◽

High Energy Ball Milling ◽

Energy Ball ◽

Nonstoichiometric Compounds

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High-energy ball milling

10.1533/9781845699444 ◽

2010 ◽

Cited By ~ 36

Author(s):

Małgorzata Sopicka-Lizer

Keyword(s):

Ball Milling ◽

High Energy ◽

High Energy Ball Milling ◽

Energy Ball

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Effects of Recycled Fe2O3 Nanofiller on the Structural, Thermal, Mechanical, Dielectric, and Magnetic Properties of PTFE Matrix

Polymers ◽

10.3390/polym13142332 ◽

2021 ◽

Vol 13 (14) ◽

pp. 2332

Author(s):

Ahmad Mamoun Khamis ◽

Zulkifly Abbas ◽

Raba’ah Syahidah Azis ◽

Ebenezer Ekow Mensah ◽

Ibrahim Abubakar Alhaji

Keyword(s):

Electron Microscopy ◽

High Energy ◽

Filler Loading ◽

Complex Permeability ◽

X Ray Diffraction ◽

Thermal Expansion Coefficients ◽

Transmission Electron ◽

Energy Ball ◽

Hematite Fe2o3 ◽

Ptfe Composites

The purpose of this study was to improve the dielectric, magnetic, and thermal properties of polytetrafluoroethylene (PTFE) composites using recycled Fe2O3 (rFe2O3) nanofiller. Hematite (Fe2O3) was recycled from mill scale waste and the particle size was reduced to 11.3 nm after 6 h of high-energy ball milling. Different compositions (5–25 wt %) of rFe2O3 nanoparticles were incorporated as a filler in the PTFE matrix through a hydraulic pressing and sintering method in order to fabricate rFe2O3–PTFE nanocomposites. The microstructure properties of rFe2O3 nanoparticles and the nanocomposites were characterized through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The thermal expansion coefficients (CTEs) of the PTFE matrix and nanocomposites were determined using a dilatometer apparatus. The complex permittivity and permeability were measured using rectangular waveguide connected to vector network analyzer (VNA) in the frequency range 8.2–12.4 GHz. The CTE of PTFE matrix decreased from 65.28×10−6/°C to 39.84×10−6/°C when the filler loading increased to 25 wt %. The real (ε′) and imaginary (ε″) parts of permittivity increased with the rFe2O3 loading and reached maximum values of 3.1 and 0.23 at 8 GHz when the filler loading was increased from 5 to 25 wt %. A maximum complex permeability of 1.1−j0.07 was also achieved by 25 wt % nanocomposite at 10 GHz.

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Defect-induced B4C electrodes for high energy density supercapacitor devices

Scientific Reports ◽

10.1038/s41598-021-90878-0 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Özge Balcı ◽

Merve Buldu ◽

Ameen Uddin Ammar ◽

Kamil Kiraz ◽

Mehmet Somer ◽

...

Keyword(s):

Active Carbon ◽

High Performance ◽

Carbon Sources ◽

High Energy ◽

High Energy Density ◽

Synthesis Conditions ◽

High Energy Ball Mill ◽

Energy Ball ◽

G Ratio ◽

Energy And Power Density

AbstractBoron carbide powders were synthesized by mechanically activated annealing process using anhydrous boron oxide (B2O3) and varying carbon (C) sources such as graphite and activated carbon: The precursors were mechanically activated for different times in a high energy ball mill and reacted in an induction furnace. According to the Raman analyses of the carbon sources, the I(D)/I(G) ratio increased from ~ 0.25 to ~ 0.99, as the carbon material changed from graphite to active carbon, indicating the highly defected and disordered structure of active carbon. Complementary advanced EPR analysis of defect centers in B4C revealed that the intrinsic defects play a major role in the electrochemical performance of the supercapacitor device once they have an electrode component made of bare B4C. Depending on the starting material and synthesis conditions the conductivity, energy, and power density, as well as capacity, can be controlled hence high-performance supercapacitor devices can be produced.

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Impact Evaluation of High Energy Ball Milling Homogenization Process in the Phase Distribution of Hydroxyapatite-Barium Titanate Plasma Spray Biocoating

Coatings ◽

10.3390/coatings11060728 ◽

2021 ◽

Vol 11 (6) ◽

pp. 728

Author(s):

Roberto Gómez Batres ◽

Zelma S. Guzmán Escobedo ◽

Karime Carrera Gutiérrez ◽

Irene Leal Berumen ◽

Abel Hurtado Macias ◽

...

Keyword(s):

Barium Titanate ◽

Ball Milling ◽

Plasma Spray ◽

Bonding Strength ◽

Phase Distribution ◽

High Energy ◽

High Energy Ball Milling ◽

X Ray ◽

Nanomechanical Properties ◽

Energy Ball

Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating deposited by APS; in order to compare the impact of the milling process, powders were homogenized by mechanical stirring homogenization (MSH) too. For the two-homogenization process, three weight percent ratios were studied; 10%, 30%, and 50% w/w of BT in the HA matrix. The phase and crystallite size were analyzed by X-ray diffraction patterns (XRD); the BT-phase distribution in the coating was analyzed by backscattered electron image (BSE) with a scanning electron microscope (SEM); the energy-dispersive X-ray spectroscopy (EDS) analysis was used to determinate the Ca/P molar ratio of the coatings, the degree of adhesion (bonding strength) of coatings was determinate by pull-out test according to ASTM C633, and finally the nanomechanical properties was determinate by nanoindentation. In the results, the HEBM powder processing shows better efficiency in phase distribution, being the 30% (w/w) of BT in HA matrix that promotes the best bonding strength performance and failure type conduct (cohesive-type), on the other hand HEBM powder treatment promotes a slightly greater crystal phase stability and crystal shrank conduct against MSH; the HEBM promotes a better behavior in the nanomechanical properties of (i) adhesive strength, (ii) cohesive/adhesive failure-type, (iii) stiffness, (iv) elastic modulus, and (v) hardness properties.

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