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Kategorien Fachartikel (PDF) Copper Recovery of Metals from Anode Slime Containing High Sn

Kategorien Fachartikel (PDF) Copper Pressure leaching of copper concentrate

Kategorien Fachartikel (PDF) Copper Flue dust from the copper converter process – Recovery of Cu and In by solvent extraction

Kategorien Fachartikel (PDF) Copper Recovery of Metals from Solid Wastes in Copper Smelter

Kategorien Fachartikel (PDF) Copper Bioleaching of Copper from WEEE by Acidithiobacillus ferrooxidans and Acidophilic Mixtures from AMD

Kategorien Fachartikel (PDF) Copper Cu isotope fractionation during prehistoric smelting – a contribution of modern pyrometallurgy

Kategorien Fachartikel (PDF) Copper RHI’s Possibilities for Copper and Wire Producing Applications

Kategorien Fachartikel (PDF) Copper Examination of the flash smelting slag decoppering proces kinetics

Kategorien Fachartikel (PDF) Copper Microstructure and properties of ultra high strength high-alloyed and quasi-equiatomic Cu-Al-Mn allo

Kategorien Fachartikel (PDF) Copper The determination of 3D phase diagrams of the Cu2Ox-ZnO-SiO2 system

11 - 20 von 20 Ergebnissen

Recovery of Metals from Anode Slime Containing High Sn

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K. Jiang, H. Wang, Y. Wang, K. Xie

In China the quantity of spent air-conditioning, TVs, refrigerators and 3C products becomes higher and higher. After disassembling there are some materials containing copper like PCB. During secondary copper refining anode slime is produced from electrolysis. It contains Sn, Cu, Pb, Sb, Bi, Au and Ag. Beijing General Research Institute of Mining and Metallurgy (BGRIMM) carried out some research works and developed a hydrometallurgical process. The anode slime firstly was roasted at 700 – 800 C in order to oxidize Sn2+ to Sn4+. During roasting Sn, Cu and Pb are changed to oxide. Then the calcine was leached by sulfuric acid to extract copper. More than 95 % of copper went into solution with less than 0.5 % copper in the residue. The residue was leached by chloride to dissolve Pb, Sb, Bi, Au and Ag. The leaching residue is SnO2 concentrate. Au and Ag in the leaching solution were precipitated by copper powder. Then copper was precipitated by lead powder. Finally Pb was precipitated by Na2CO3 as PbCO3. In order to simplify the flow sheet the calcine was directly leached by chloride to cancel sulfuric acid leaching. Thus BGRIMM carried out solvent extraction tests to extract copper from chloride media. The results indicated that LIX984N or LIX973 could extract copper from chloride solution. The copper content in the raffinate could be less than 0.2 g/L. During pilot tests there was crud between aqueous and organic phases. It was deduced that Sn and Pb in solution had some effect on the solvent extraction.

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Pressure leaching of copper concentrate

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Grzegorz Pietek, Zbigniew Szołomicki, Katarzyna Leszczyńska-Sejda. Mateusz Ciszewski

The focus of the article is to show results of hydrothermal processing of sulphide-type copper concentrate in a lab-scale pressure reactor. Investigation was carried out in the following ranges of the pressure process parameters: temperature 115 – 190 °C, total pressure 13 – 40 bar, Fe3+ addition 1 – 19.95 g/L, phases ratio S/L 0.1 – 0.25, leaching time 0.5 – 4 h. All tests were evaluated by analysing leach residue and pregnant leach solution compositions (Cu, Zn, Co, Fe content). Magnesium removal from the raw copper concentrate at ambient temperature by H2SO4aq addition, were also investigated. The following ranges of parameters: pH = 2 – 4.7, leaching time 0.5 – 2 h, phase ratios S/L 0.1 – 0.5 were chosen.

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Flue dust from the copper converter process – Recovery of Cu and In by solvent extraction

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Dipl.-Ing. Philipp Rädecker, Prof. Dr.-Ing. Christiane Scharf, M. Sc. Philipp Zürner, Juniorprof. Dr. Gero Frisch, Dipl.-Min. Gunther Pieplow, Dipl.-Ing. (FH) Doreen Lindner, Dr. Jörg Koch

Flue dusts from copper metallurgy are resources for base metals such as copper, zinc, tin or lead. However, there is also a potential for the recovery of strategic elements like indium. At the moment flue dusts are recirculated within the copper process, but residues are available from historic production processes. Hydrometallurgical processes seem to be a promising method to recover the base and strategic metals from these fine-grained flue dusts. In preparation for further processing, the secondary material was characterized by mineral liberation analysis (MLA) and electron probe micro analysis (EPMA). An iron- and zinc-rich spinel phase (Zn,Fe,Mn)(Fe,Mn)2O4 was detected as the main phase (76 wt.-%) in the flue dust. The chemical composition of the flue dust was analysed by X-ray fluorescence spectroscopy (XRF spectroscopy). Leaching by sulfuric acid leads to precipitation of lead sulphate and calcium sulphate, which remain in the residue. The level of some impurities in the solution can be controlled. This work focuses on the selective recovery of copper and indium by solvent extraction from the leaching solution. Preliminary synthetic solutions of copper, iron(III), zinc, indium and mixtures of them were used for the investigations. The influence of pH value, concentration of acidic extractants, extraction time, and phase ratio on the extraction of copper, iron(III), zinc, and indium were studied. The results of the selective extraction of copper in the presence of iron(III) will be presented.

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Recovery of Metals from Solid Wastes in Copper Smelter

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Kaixi Jiang, Haibei Wang, Yufang Wang, Xiaoping Zou

In copper smelters some solid wastes containing arsenic like flue dust, arsenic cake, black copper mud and lead cake were produced. They all contain high arsenic and also some valuable metals like copper, lead, zinc, antimony, bismuth and precious metals. BGRIMM carried out series of research and engineering works in recent years. Some technologies were developed to treat arsenic and recovering the metals. Pressure leaching process was developed to treat arsenic sulfide cake. At 105 – 110 C arsenic sulfide was oxidized into elemental sulfur with oxygen partial pressure 500 kPa. More than 95 % of arsenic was dissolved into solution as H2AsO4-. At the same time more than 95 % and 98 % of copper and rhenium were also leached into solution. The leaching residue was sent back to the smelting furnace. The leaching solution was firstly reduced by SO2 and then was crystallized by cooling to produce As2O3. Rhenium was recovered by solvent extraction with N235. Finally copper solution or copper sulfate by crystallization went back to copper electrolysis. In 2008 BGRIMM cooperated with Jiangxi Copper and built a pressure leaching plant in Guixi smelter. The capacity is 25000 t/a arsenic sulfide treated and with the output of 2500 t/a As2O3. Atmospheric leaching process was developed to treat flue dust and black copper mud. At 85 C more than 90 % of copper, zinc and arsenic were leached into solution by blowing air. Leaching residue will go to double side blowing furnace to extract lead, antimony, bismuth and precious metals. Leaching solution was firstly precipitated arsenic into FeAsO4 at 85 C and pH value 1.5. Then SX-EW process was used to extract copper from solution. The raffinate was removed arsenic again by precipitation with FeSO4. Finally zinc sulfate or ZnO can produce from the solution. Double side blowing furnace was developed to treat above leaching residue and other wastes containing lead, antimony, bismuth and precious metals. In furnace lead, bismuth and precious metals will convert into alloy. Most of antimony will go to off gas to produce antimony oxide by dust collection. The alloy went to electrolysis to produce lead metal. The anode slime went to recover bismuth and precious metals by pyro-metallurgical process.

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Bioleaching of Copper from WEEE by Acidithiobacillus ferrooxidans and Acidophilic Mixtures from AMD

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MSc. Solange Kazue Utimura, MSc. Carlos G.Alvarez Rosário, PhD. Jorge A.Soares Tenório, PhD. Denise C. Romano Espinosa

In this paper, the recycle of waste electric and electronic equipment (WEEE) is important to reduce the quantities of waste in landfills and attenuate the pollution in groundwater, soil and air due the contaminants and toxic substances. The advantage in recycling WEEE is that it becomes an economical option and represents a potential source of valuable metals and materials. Wastes of printed wired boards (PWBs) as a principal part of Electrical and Electronic Equipment (WEEE) and are made of metallic, polymeric and ceramic materials. Biohydrometallurgical process has been applied for extracting metals from low-grade ores and tailings. The bioleaching technologies may offer possibilities to recycling PWBs from discarded printers to recover metals, especially copper and precious metals. Previous studies were conducted with strain bacteria Acidithiobacillus ferrooxidans (A. ferrooxidans) and bacterial consortium from acid mine drainage (AMD) in bioleaching copper from PWBs. The bioleaching experiments were performed in orbital shaker at temperature 30 °C and 170 rpm with 10 % (v/v) inoculum and pulp density of 30 g/L. The copper concentration was determined by energy dispersive X-ray Fluorescence (XRF). The results showed that the copper recovery from PWBs using A. ferrooxidans was 100 % in 8 days and with a mixed culture of bacteria from AMD the copper recovery was 98 % in the same time.

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Cu isotope fractionation during prehistoric smelting – a contribution of modern pyrometallurgy

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Thomas Rose, Sabine Klein

Today the advanced development of tools and methods in archaeometallurgy enables a more accurate reconstruction and understanding of ancient smelting techniques. Especially pyrometallurgical experiments allow the establishment of secure links between ores and their respective smelting products. As copper was the first metal to be smelted from ore, interest in copper metallurgy has dominated the field of archaeometallurgy from its beginning. The aim of this contribution is to fuel the research on copper isotope fractionation during the smelting process. To analyse the fractionation behaviour seven smelting experiments with malachite were carried out in a small induction furnace and different portions of the melt were extracted from the crucible during the process. Our results show a significant fractionation of copper isotopes during the smelting process. As predicted by the stable isotope fractionation theory, the lighter isotope is enriched in the metallic melt. Although no significant differences between ore and metal were measured, the sole appearance of fractionation questions the direct link between both. Therefore existing applications of copper isotopes in archaeometallurgy must be re-evaluated for their suitability

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RHI’s Possibilities for Copper and Wire Producing Applications

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A. Franzkowiak, S. Breyner

RHI is a world leader in refractories technology through its global presence, thorough knowledge and comprehensive portfolio with a broad customer base. To address the high complexity and specification diversity of the multiple production routes, RHI is striving for appropriate materials to meet the challenging pyrometallurgical requirements of its customers in the nonferrous metals industry. This article narrows the topic down to a key aspect on copper, and particularly copper wire producing businesses. By giving a brief insight into the copper wire production, the paper points out the material properties of oxidic and nitride bonded silicon carbide based refractory ceramics including cup test and field test results. According to the preliminary findings this comparison of the diverse bonding systems highlights a significant conclusion serving frequent market requests: silicon carbide refractory materials with oxidic bond are a well suited and an efficient alternative to nitride bonded products for the application in cathode shaft melting furnaces, launders or holding furnaces. As RHI offers both types of bonded materials in its wide-ranging portfolio, it is in the position to propose various tailor-made solutions for lining concepts, especially due to the long-standing manual manufacturing know-how and possibilities. Combined with extensive worldwide experience it makes RHI a reliable partner and supplier to implement even the most complex projects.

Diese Kategorie durchsuchen: Copper

Examination of the flash smelting slag decoppering proces kinetics

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Piotr Madej, Józef Czernecki, Tomasz Sak, Grzegorz Krawiec, Bogusław Onderka, Łukasz Kortyka, Katarzyna Klejnowska, Piotr Palimąka

In 1978 Copper Smelter Głogów II started using the flash smelting process to melt the copper concentrates. The parameters of the polish concentrates (low iron and sulfur content, high organic carbon content) allowed producing the blister copper directly from the concentrate in the flash smelting furnace. The single-stage flash smelting process requires high oxygen potential and therefore produces the slag containing 12 – 16 wt.-% copper. Because of the high copper content, the slag needs to be decoppered. The technology concept developed by IMN Gliwice [1 – 3] is based on the reduction of the metal oxides in the electric furnace. The thermodynamic analysis [4 – 5] indicates that the copper can be removed from the slag to the concentration up to 0.003 wt.-%. The values obtained during the industrial process (the amount of copper left after the reduction is approximately 0.5 wt.-%) indicate that the calculated value is two times lower than the Cu concentration after decoppering, thus the Cu2O reduction in the electric furnace is not taking place under the thermodynamic equilibrium conditions.

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Microstructure and properties of ultra high strength high-alloyed and quasi-equiatomic Cu-Al-Mn allo

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Igor Altenberger, Stefanie Heinrichs, Hans-Achim Kuhn

The ternary system Cu-Al-Mn is known for its diverse technological applications. Cu-Al-Mn alloys have experienced widespread applications as functional or smart materials such as Shape-Memory alloys, Heusler alloys for magnetic applications or alloys with high damping capacity. In the present contribution, results on an ultra high strength Cu-Al-Mn alloy as well as quasiequiatomic Cu-Al-Mn are outlined and discussed. The microstructure and mechanical properties of CuAl21Mn21 were characterized by scanning electron microscopy, X-ray diffraction as well as indentation and compression tests. Cast as well as isothermally forged conditions were investigated and compared to copper based metallic glass as an ultra high strength benchmark material. Furthermore, the effect of heat treatment on strength and ductility was investigated. The results demonstrate that CuAl21Mn21 is a relatively light and economic ultra high strength copper alloy with excellent high temperature behavior and wear properties. Even higher strength at elevated temperature can be achieved by quasi-equiatomic Cu-Al-Mn composition. Finally, the properties of Cu-Al-Mn alloys as damping materials are outlined briefly and exemplary results are discussed.

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The determination of 3D phase diagrams of the Cu2Ox-ZnO-SiO2 system

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Dr. Longgong Xia, Prof. Zhihong Liu b, Prof. Pekka Taskinen

The smelting of Zn-bearing materials will produce high ZnO content slags, and the monitoring of slag properties has significant importance for the smelter. Phase diagrams can provide road maps in optimizing metallurgical processing parameters. The determination of phase diagrams in multicomponent oxide systems needs sufficient experimental data. However, thermodynamic information of ZnO rich slags is incomplete in the literature. Therefore, systematic work has been performed to determine the phase relationships in the Cu-O-ZnO, Cu-O-SiO2, ZnO-SiO2, and Cu-OZnO- SiO2 systems in previous studies. Both liquidus temperatures and the solid solubility data have been collected. The equilibration/quenching/EDS technique has been applied in determining the eutectic point of the Cu-O-ZnO-SiO2 system. The technique used in this study involved preparation of a synthetic pellet of predetermined composition. The pellet placed in a suitable container was then equilibrated at the target temperature for certain period of time, followed by rapid quenching, so that the phase assemblages at high temperatures were frozen instantly. The compositions of all phases in equilibrium were measured by EDS from the polished sections. All the results from the present study and previous studies have been used in constructing the 3D version of ternary phase diagrams of the Cu2Ox-ZnO-SiO2 system. The results of the present study will provide novel information and both for fundamental scientific research and industrial practices.

Diese Kategorie durchsuchen: Copper
11 - 20 von 20 Ergebnissen
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