The paper presents an improved process for recycling of silver-plate brass housing. Silver and copper are recovered with a purity of 99.99 % and 99.90 %, respectively, with the aim of obtaining materials of higher value using additional procedures based on the same process and equipment. The novel approach with subsequent electrorefining yields copper of 99.99 % purity with BS EN 1978:1998 (Cu-CATH-1) quality and is referred to as LME grade A. Additional processing of silver results in superfine, micro-sized Ag powder with partie size from 0.14 to 1.13 mu m and purity of 99.999 %. Copper electrorefining tests were performed using 1.50 dm(3) of synthetic electrolyte in a 2 dm(3) electrolytic cell. Effects of current density and electrolyte composition were investigated. Optimal current density for the first and second refining was 120 A/m(2) and 200 A/m(2), respectively. Additional refining of silver was performed by chemical reduction from an aqueous solution. Optimal results were obta...ined with ascorbic acid as a reduction agent in concentration of 0.1 mol/dm(3) and polyvinylpyrrolidon as a protective agent in concentration of 2 % by mass. The investigation results could be adopted into production.
TY - JOUR
AU - Dimitrijević, Stevan P.
AU - Andić, Z.
AU - Kamberović, Željko
AU - Dimitrijević, Silvana B.
AU - Vuković, Nikola
PY - 2014
UR - https://ritnms.itnms.ac.rs/handle/123456789/296
AB - The paper presents an improved process for recycling of silver-plate brass housing. Silver and copper are recovered with a purity of 99.99 % and 99.90 %, respectively, with the aim of obtaining materials of higher value using additional procedures based on the same process and equipment. The novel approach with subsequent electrorefining yields copper of 99.99 % purity with BS EN 1978:1998 (Cu-CATH-1) quality and is referred to as LME grade A. Additional processing of silver results in superfine, micro-sized Ag powder with partie size from 0.14 to 1.13 mu m and purity of 99.999 %. Copper electrorefining tests were performed using 1.50 dm(3) of synthetic electrolyte in a 2 dm(3) electrolytic cell. Effects of current density and electrolyte composition were investigated. Optimal current density for the first and second refining was 120 A/m(2) and 200 A/m(2), respectively. Additional refining of silver was performed by chemical reduction from an aqueous solution. Optimal results were obtained with ascorbic acid as a reduction agent in concentration of 0.1 mol/dm(3) and polyvinylpyrrolidon as a protective agent in concentration of 2 % by mass. The investigation results could be adopted into production.
PB - Bulgarian Academy of Sciences
T2 - Bulgarian Chemical Communications
T1 - Recycling of silver-plated brass for production of high purity copper and ultrafine silver powder for electric contacts
EP - 824
IS - 4
SP - 814
VL - 46
UR - conv_1046
UR - https://hdl.handle.net/21.15107/rcub_technorep_2553
ER -
@article{
author = "Dimitrijević, Stevan P. and Andić, Z. and Kamberović, Željko and Dimitrijević, Silvana B. and Vuković, Nikola",
year = "2014",
abstract = "The paper presents an improved process for recycling of silver-plate brass housing. Silver and copper are recovered with a purity of 99.99 % and 99.90 %, respectively, with the aim of obtaining materials of higher value using additional procedures based on the same process and equipment. The novel approach with subsequent electrorefining yields copper of 99.99 % purity with BS EN 1978:1998 (Cu-CATH-1) quality and is referred to as LME grade A. Additional processing of silver results in superfine, micro-sized Ag powder with partie size from 0.14 to 1.13 mu m and purity of 99.999 %. Copper electrorefining tests were performed using 1.50 dm(3) of synthetic electrolyte in a 2 dm(3) electrolytic cell. Effects of current density and electrolyte composition were investigated. Optimal current density for the first and second refining was 120 A/m(2) and 200 A/m(2), respectively. Additional refining of silver was performed by chemical reduction from an aqueous solution. Optimal results were obtained with ascorbic acid as a reduction agent in concentration of 0.1 mol/dm(3) and polyvinylpyrrolidon as a protective agent in concentration of 2 % by mass. The investigation results could be adopted into production.",
publisher = "Bulgarian Academy of Sciences",
journal = "Bulgarian Chemical Communications",
title = "Recycling of silver-plated brass for production of high purity copper and ultrafine silver powder for electric contacts",
pages = "824-814",
number = "4",
volume = "46",
url = "conv_1046, https://hdl.handle.net/21.15107/rcub_technorep_2553"
}
Dimitrijević, S. P., Andić, Z., Kamberović, Ž., Dimitrijević, S. B.,& Vuković, N.. (2014). Recycling of silver-plated brass for production of high purity copper and ultrafine silver powder for electric contacts. in Bulgarian Chemical Communications
Bulgarian Academy of Sciences., 46(4), 814-824.
conv_1046
Dimitrijević SP, Andić Z, Kamberović Ž, Dimitrijević SB, Vuković N. Recycling of silver-plated brass for production of high purity copper and ultrafine silver powder for electric contacts. in Bulgarian Chemical Communications. 2014;46(4):814-824.
conv_1046 .
Dimitrijević, Stevan P., Andić, Z., Kamberović, Željko, Dimitrijević, Silvana B., Vuković, Nikola, "Recycling of silver-plated brass for production of high purity copper and ultrafine silver powder for electric contacts" in Bulgarian Chemical Communications, 46, no. 4 (2014):814-824,
conv_1046 .
