ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Direct electrorefining of copper scrap using an anode-support system in a bipolar cell (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 813-818 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes the application of an anode-support system (AS) to the direct electrorefining of chopped copper scrap using the bipolar connection (series system). The authors have determined that it is possible to utilize a specially designed basket made with sheet (cathodic face) and mesh (anodic side) titanium, under the same operating conditions used for the industrial electrorefining of copper with conventional cast anodes. Titanium material remains passive and acts only as electrical contact between the anodic copper pieces and the external current source. Electrolysis of 72 h duration could be carried out using the AS system loaded with scrap copper pieces, with a current efficiency in the range 91–92% and a power requirement of 0.14 kWh (kg Cu)−1. The AS system involves less copper inventory in the cell room in the order of 45–55% compared with the traditional bipolar electrorefining process. In addition, no pyrometallurgical operations are necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249954
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Anode-support system for the direct electrorefining of cement copper Part I: Process conditions using horizontal rotary cathodes (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 240-246 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes a preliminary study towards a modified anode-support system for the direct electrorefining of cement copper. The proposed system is an alternative process for small mines that produce cement after leaching of copper oxide minerals. It is feasible to utilize a cell provided with a horizontal AISI-316 stainless steel mesh covered with a layer of cement copper as anode system. As cathode system, several horizontal rotary cylinders of AISI-316 stainless steel can be used. The rotary cylinders, partially immersed in acidic copper sulphate electrolyte, must have an internal electrical contact with a copper shaft and two or more isolated slots at the surface to permit the stripping of the copper deposits in the form of thin sheets. The cement copper must be maintained wet to avoid rapid oxidation. The use of pulsed current permits control of the formation of a non-conductive copper sulphate layer on the cement surface, avoiding a continuous increase in cell voltage. As operating conditions a solution of CUSO4.5H2O (160 g dm−3) and H2SO4 (50 g dm−3) with j c = 5.0 A dm−2, T = 40 °C, u = 200 rpm; and pulsed current with t d = 3 min and t d/t 0 = 20 can be used. At this stage of the study cement copper (90–95% purity) was utilized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00262962
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical production of lead chromate and sodium hydroxide in a two-compartment cell (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 1146-1152 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes the application of an anode-support system (AS) and a cationic permselective membrane to the electrolytic production of yellow lead chromate pigment and sodium hydroxide solution in a two-compartment cell. The authors have determined that it is possible to utilize in the process an AISI-316 stainless steel or a titanium mesh basket loaded with lead granules. Under the operating conditions used both the AISI-316 stainless steel and the titanium remain passive and act only as electrical contact between the lead anodic pieces and the external current source. A Nafion® 901 bimembrane (Dupont, USA) is utilized to separate both compartments. Good quality yellow lead chromate and sodium hydroxide solution (50–150 g dm−3) are obtained, with a power requirement of 0.41 kWh (kg PbCrO4)−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241313
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The anode-support system: an alternative for the electrorefining of tin in sulphuric acid medium (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 60-65 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes a study of the application of an anode-support system to the electrorefining of tin in sulphuric acid medium. The authors have established that it is feasible to utilize a metallic basket of AISI-316 stainless steel mesh as the anode-support, with granules of 97% tin inside the basket. It is possible to utilize the anode-support system under the same conditions used for the industrial electrorefining of tin with conventional cast anodes. In a comparative study of experiments for the electrorefining of tin (97%) artificially contaminated with lead (3%), antimony (3%) or lead-antimony (1.5%–1.5%), it has been established that the anode-support system has a significant advantage over the traditional system. In fact, electrolyses of 10 days duration can be carried out continuously using the anode-support system, with the cell voltage remaining practically constant. In electrolyses using the traditional cast anodes it is necessary to interrupt the process every one or two days to eliminate mechanically the passivating film (PbS04 and Sb oxides) that covers the electrode and increases the anodic overpotential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241577
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Electrochemical production of cuprous oxide and metallic nickel in a two-compartment cell (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 542-547 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The purpose of the present investigation was to develop an electrochemical process to obtain simultaneously cuprous oxide powder and metallic nickel in a two-compartment cell. Nafion® 901 bimembrane (Dupont, USA) was employed to separate the compartments to avoid the diffusion of nickel ions from the catholyte to the anolyte. A continuous addition of sodium hydroxide solution to the anodic compartment was necessary to form in situ the cuprous oxide by chemical reaction with the cuprous chlorocomplexes generated at the anode. As an anode system, a titanium basket filled with copper scrap wire was utilized. The anodic operating conditions were: NaCl 250 g dm−3, pH 10, 80°C, c.d. 6 A dm−2 and current concentration 0.4 A dm−3, The cathodic parameters were: Ni2i 74 g dm−3, H3B0330 g dm−3, sodium lauryl sulphate 0.5 g dm−3, coumarin 0.15 g dm−3, pH2, 50°C, c.d. 6 A dm−2 Good quality red-violet cuprous oxide powder, meeting ASTM specifications D912-65 to be used in antifouling paints and metallic nickel (〉 99.96% Ni) was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249855
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Electrochemical production of cuprous oxide using the anode-support system (1993)
    Springer
    Journal of applied electrochemistry 23 (1993), S. 308-315 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The preferred process for the production of cuprous oxide powder is by the anodic dissolution of copper in an alkaline solution of sodium chloride. The purpose of the present investigation was to develop a cuprous oxide process suitable for use on an industrial scale usiing the anode-support system, i.e. an anode comprising a titanium mesh basket loaded with small pieces of high-grade copper scrap. Laboratory investigations with this type of anode together with a titanium mesh cathode were conducted using cells having capacities up to 400 dm3. The recommended operating conditions based on 120 h runs using the 400 dm3 cell are as follows: NaCl: 250 g dm−3; c.d.: 6 A dm−2; CI: 0.37 A dm−3; temperature: 80°C; pH 10. Of particular importance, especially as regards the quality of the product and cell scale-up, is the relationship between the current and the volume of the electrolyte, denoted as Cl and expressed as A dm−3. The use of anode and cathode diaphragms of polypropylene obviated the need for additives to counteract copper redox reactions in the cell. The power yield was 0.8–0.9 kWh kg−1. The product was well within ASTM specification D912-65 for Cu2O for use in antifouling paints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296685
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Analysis of the presence of different contaminants on the copper electrodeposits morphology obtained from cement copper acid solutions (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 1475-1479 
    Details
    ISSN: 1572-8838
    Keywords: cement copper ; copper electrodeposits morphology ; copper electrorefining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003848707544
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Effect of a polyethoxylate surfactant on the electrodeposition of tin (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 558-562 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrodeposition of tin in the presence of polyethoxylated additive TX-102 has been investigated in acid medium. The additive causes a substantial increase in the overpotential for the discharge of Sn2+ ions. Below 0.12 g dm−3 the additive has little effect on the quality of the tin deposits. Periodic oscillations in the voltage of the cell are observed, which are associated with the initial growth of whiskers. For higher concentrations of additive, the deposits are smooth and homogeneous, and no growth of whiskers and no voltage oscillations are observed. The effect of TX-102 for concentrations below the CMC has been interpreted in terms of blockage of high energy sites of preferential growth on the tin surface. For additive concentrations above the CMC, micelles are formed. These high molecular weight aggregates also block the surface, hindering the mass transport of Sn2+ through a membrane-like layer that forms on the tin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024097
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Direct electrorefining of copper scrap using a titanium anode-support system in a monopolar cell (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 206-211 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes the application of an anode-support system to the direct electrorefining of copper scrap (〉 95%) in sulphuric acid medium. The authors have established that it is possible to utilize a basket of titanium mesh as the anode-support, with chopped scrap inside the basket. It is feasible to utilize this system under the same operational conditions used for the industrial electrorefining of copper with conventional cast anodes. The proposed system avoids all the pyrometallurgical stages needed to produce the traditional cast anodes used in copper electrorefining and acts only as electrical contact between the anodic copper mass and the external current. Cathodes of good quality (〉 99.98% Cu) were obtained after 14-day electrolyses, with a current yield of 98.5–99.0% and inventory savings of 48–57% referred to the conventional process using casting anodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00242885
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Anode-support system for the direct electrorefining of cement copper Part II: Process conditions using a circular cell with vertical rotary cathode (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 1052-1056 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper describes the second part of a study on the development of a modified anode-support system for the direct electrorefining of cement copper. The proposed system is an alternative process for small mines that produce cement copper after the leaching of copper oxide minerals. It is feasible to utilize a circular cell provided with an annular AISI-316 stainless steel mesh supporting a mass of cement copper as the anode system. A vertical rotary cylinder of AISI-316 stainless steel can be used as the cathode. The rotary cylinder, totally immersed in acidic copper sulphate electrolyte must have two isolated slots at the surface to permit the stripping of the copper deposits in the form of thin sheets. As operating conditions, a solution of CUSO4 · 5H20: 150 g dm−3 and H2SO4: 50 g dm−3, j e: 5.0 A dm−2, T: 40 °C, u: 60 rpm, can be used. The cement copper must be maintained wet to avoid rapid oxidation. At this stage of the study cement copper of 90–95% purity was utilized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241955
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...