Modern techniques in electrolytic refining of copper

Bayliss, C.R.

doi:10.1049/ep.1976.0399

Cited by 6 publications

(5 citation statements)

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“…Ultimately, once larger scale cells are optimized, SWNT processing may be scaled out to a battery of multiple cells, in a manner analogous to other commercial processes. By combining dissolution with electroplating, a semicontinuous bulk purification process can be envisioned for nanotubes, in a similar fashion to the industrial purification of copper . This approach may provide a route toward large-scale sorting of specific SWCNT species (each representing a distinct molecular structure), which almost always coexist as-synthesized, despite recent advances .…”

Section: Discussionmentioning

confidence: 99%

“…By combining dissolution with electroplating, a semicontinuous bulk purification process can be envisioned for nanotubes, in a similar fashion to the industrial purification of copper. 54 This approach may provide a route toward large-scale sorting of specific SWCNT species (each representing a distinct molecular structure), which almost always coexist as-synthesized, despite recent advances. 55 In the future, nanotubide solutions monodispered in structure and charge density may, therefore, be prepared.…”

Section: Discussionmentioning

confidence: 99%

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Electrochemical Processing of Discrete Single-Walled Carbon Nanotube Anions

et al. 2013

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The dissolution of single-walled carbon nanotubes (SWCNTs) remains a fundamental challenge, reliant on aggressive chemistry or ultrasonication and lengthy ultracentrifugation. In contrast, simple nonaqueous electrochemical reduction leads to spontaneous dissolution of individualized SWCNTs from raw, unprocessed powders. The intrinsic electrochemical stability and conductivity of these nanomaterials allow their electrochemical dissolution from a pure SWCNT cathode to form solutions of individually separate and distinct (i.e., discrete) nanotube anions with varying charge density. The integrity of the SWCNT sp² framework during the charge/discharge process is demonstrated by optical spectroscopy data. Other than a reversible change in redox/solvation state, there is no obvious chemical functionalization of the structure, suggesting an analogy to conventional atomic electrochemical dissolution. The heterogeneity of as-synthesized SWCNT samples leads to the sequential dissolution of distinct fractions over time, with fine control over the electrochemical potential. Initial preferential dissolution of defective nanotubes and carbonaceous debris provides a simple, nondestructive means to purify raw materials without recourse to the usual, damaging, competitive oxidation reactions. Neutral SWCNTs can be recovered either by electroplating at an anode or by reaction with a suitable electrophile.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Electrochemical Processing of Discrete Single-Walled Carbon Nanotube Anions

et al. 2013

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“…iron scrap melting, conducting feed material) [13,14]. Whereas, chemical electrolysis is used in metal refining from impure stock and winning from ore (electro refining/winning is electro deposition of pure metal at the electrode; the process is used for extraction of copper, aluminium, zinc and magnesium) [1,[15][16][17]. Hydrogen, chlorine, sodium hydroxide, sodium chlorate, oxygen and adiponitrile production also utilises the electrolysis process [18][19][20].…”

Section: High-current Variable-voltage DC Applicationsmentioning

confidence: 99%

“…Another type of load that requires high-current rectifiers is an industrial electrolyser [1,2,[15][16][17][18][19][20]. Fig.…”

Section: Iet Power Electronicsmentioning

confidence: 99%

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High‐current variable‐voltage rectifiers: state of the art topologies

Solanki

Fröhleke

Böcker

et al. 2015

IET Power Electronics

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Applications such as electrolysis, electrowinning, DC arc furnaces and plasma torches require high-current (several kA) power supplies at low-voltage levels (few hundreds of volts). In this study, conventional rectifier topologies (diode-and thyristor-based multi-pulse rectifiers with on-load tap changing transformer and chopper-rectifier) used for high-current, variable-voltage applications are reviewed along with recent advancements in the field. The main applications themselves are also discussed. Issues with conventional topologies are highlighted. Power quality techniques like passive and active filters are discussed for power factor and current harmonics compensation. Advanced medium-to high-frequency transformer-based topologies (with current and voltage source rectifiers) are discussed along with simulation results.

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Ore Enrichment and Smelting of Copper

Hocking

1985

Modern Chemical Technology and Emission Control

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Modern techniques in electrolytic refining of copper

Cited by 6 publications

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Electrochemical Processing of Discrete Single-Walled Carbon Nanotube Anions

Electrochemical Processing of Discrete Single-Walled Carbon Nanotube Anions

High‐current variable‐voltage rectifiers: state of the art topologies

Ore Enrichment and Smelting of Copper

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