Treatment of Copper Converter Flue Dust for the Separation of Metallic/Non-metallic Copper by Hydrometallurgical Processing.

In the search for new materials to fight against antibiotic-resistant bacteria, a hybrid composite from metallic copper nanoparticles (CuNPs) and a novel cationic π-conjugated polyelectrolyte (CPE) were designed, synthesized, and characterized. The CuNPs were prepared by chemical reduction in the presence of CPE, which acts as a stabilizing agent. Spectroscopic analysis and electron microscopy showed the distinctive band of the metallic CuNP surface plasmon and their random distribution on the CPE laminar surface, respectively. Theoretical calculations on CuNP/CPE deposits suggest that the interaction between both materials occurs through polyelectrolyte side chains, with a small contribution of its backbone electron density. The CuNP/CPE composite showed antibacterial activity against Gram-positive (Staphylococcus aureus and Enterococcus faecalis) and Gram-negative (Escherichia coli and Salmonella enteritidis) bacteria, mainly attributed to the CuNPs’ effect and, to a lesser extent, to the cationic CPE.

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Surface modification of YS-20 with polydopamine for improving the tribological properties of polyimide composites

Friction ◽

10.1007/s40544-020-0473-1 ◽

2021 ◽

Author(s):

Liangfei Wu ◽

Zhaozhu Zhang ◽

Mingming Yang ◽

Junya Yuan ◽

Peilong Li ◽

...

Keyword(s):

Polymer Composites ◽

Tribological Properties ◽

Metallic Copper ◽

Great Effort ◽

Modified Polymer ◽

Milling Method ◽

Multi Walled Carbon Nanotubes ◽

Mixing Method ◽

Walled Carbon Nanotubes ◽

Polymer Powders

AbstractRecently, great effort has been devoted to prepare various reinforce fillers to improve polymer performances, but ignoring the importance of raw polymer powders which are indispensable parts of hot-pressed polymer composites. Herein, we engineer raw polyimide (PI) powders with the assistance of polydopamine (PDA) in aqueous solutions. After the modification, polymer powders change from hydrophobic to hydrophilic, which makes it is possible to further modification of polymer powders in liquid phase. During the curing process of modified polymer powders, the partial dehydration of the catechol groups and crosslinking of PDA via C-O-C bonds are confirmed. Based on the features of PDA, a non-destructive mixing method is utilized to realize homogeneous dispersion of multi-walled carbon nanotubes (MWCNTs) in polymer matrix. In comparison with ball milling method, this way can preserve the integrated innate structure of MWCNTs effectively. Besides, by taking full advantage of the reducing and metal-coordination capability of PDA, Cu2+ is successfully loaded onto the surfaces of polymer powders. The related characterizations demonstrate that Cu2+in situ converts to metallic copper rather than copper oxide during the hot pressing process. The tribological properties of corresponding polymer composites are also studied. These results indicate that modifying polymer powders with PDA is multi-profit and presents practical application prospect.

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Efficient removal and recovery of arsenic from copper smelting flue dust by a roasting method: Process optimization, phase transformation and mechanism investigation

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.125232 ◽

2021 ◽

Vol 412 ◽

pp. 125232

Author(s):

Wenjuan Zhang ◽

Jianyong Che ◽

Liu Xia ◽

Peicheng Wen ◽

Jun Chen ◽

...

Keyword(s):

Phase Transformation ◽

Process Optimization ◽

Copper Smelting ◽

Efficient Removal ◽

Flue Dust ◽

Removal And Recovery

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Separation and recovery of heavy metals zinc and lead from phosphorus flue dust by vacuum metallurgy

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.113001 ◽

2021 ◽

Vol 294 ◽

pp. 113001

Author(s):

Wentao Ji ◽

Keqiang Xie ◽

Shiyu Yan

Keyword(s):

Heavy Metals ◽

Flue Dust

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Behavior of copper and lead during mineralurgical and hydrometallurgical processing of flash smelting slag

Archives of Civil and Mechanical Engineering ◽

10.1007/s43452-021-00184-9 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Krzysztof Gargul ◽

Bożena Boryczko ◽

Andżelika Bukowska ◽

Adam Hołda ◽

Stanisław Małecki ◽

...

Keyword(s):

Reduction Process ◽

Copper Slag ◽

Original Method ◽

Flash Smelting ◽

Sieve Analysis ◽

Selective Enrichment ◽

Hydrometallurgical Processing ◽

Useful Components ◽

Smelting Slag ◽

The Many

AbstractThere are only a few smelters processing copper concentrates directly into blister copper. Despite the many advantages of this process, a serious challenge of this technology is the need to process the resulting flash smelting slag. It contains 12–15% copper and 2.5–4% lead. In this form, it cannot be considered as waste material and, therefore, a high-temperature reduction process is carried out. This decopperization process is energy- and time-consuming. The use of mineralurgical and hydrometallurgical processes, selective enrichment of the appropriate slag fractions in copper and lead, followed by its hydrometallurgical processing and recovery of Cu and Pb could be an interesting supplement to the methods used so far. The article presents results of research on the possibility of separation of useful components from copper slag using the original method of sieve analysis, gravitational enrichment and magnetic separation. Preliminary results of tests were made on a laboratory scale. Then, selective leaching of copper and lead from flash smelting slag was carried out, obtaining very promising results.

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