A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning
Abstract
On the basis of an old Cominco, Trail. B.C., idea of preconditioning silver (0.8 wt%) alloyed lead electrodes for a proper passivation, optimal, chemically balanced and more economical process has been developed for use in Zn electrowinning. A relatively short time anodic polarization of Fb(As) electrodes in sulphuric acid containing fluoride ions, (as a stimulating agent for protective and compact layer formation of beta-PbO2), is found to give a compact, homogeneous, long lasting passivation layer of beta-PbO2. The presence of a small amount of F--ions in the passive layer of beta-PbO2 enables the passive oxide deposit to behave as long lasting, Monitoring of Pb-ions emission testifies that the preconditioned electrode will have more than ten years of life zinc electrowinning. An additional contribution is the exchanged chemical balance of manganese species in solution: the detrimental MnO2 production is dramatically reduced. The most important achievement of the process represents, ...winning of pure zinc.
Keywords:
silver alloyed lead electrode / passivation / preconditioning process / zinc electrowinning / beta-PbO2 protective coatingSource:
Bulletin of Electrochemistry, 1998, 14, 3, 107-114Publisher:
- Central Electrochem Res Inst, Karaikkudi
Collections
Institution/Community
Poljoprivredni fakultetTY - JOUR AU - Rajković, Miloš AU - Vladisavljević, Goran AU - Ristić, Nikola AU - Jaksić, MM PY - 1998 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/141 AB - On the basis of an old Cominco, Trail. B.C., idea of preconditioning silver (0.8 wt%) alloyed lead electrodes for a proper passivation, optimal, chemically balanced and more economical process has been developed for use in Zn electrowinning. A relatively short time anodic polarization of Fb(As) electrodes in sulphuric acid containing fluoride ions, (as a stimulating agent for protective and compact layer formation of beta-PbO2), is found to give a compact, homogeneous, long lasting passivation layer of beta-PbO2. The presence of a small amount of F--ions in the passive layer of beta-PbO2 enables the passive oxide deposit to behave as long lasting, Monitoring of Pb-ions emission testifies that the preconditioned electrode will have more than ten years of life zinc electrowinning. An additional contribution is the exchanged chemical balance of manganese species in solution: the detrimental MnO2 production is dramatically reduced. The most important achievement of the process represents, winning of pure zinc. PB - Central Electrochem Res Inst, Karaikkudi T2 - Bulletin of Electrochemistry T1 - A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning EP - 114 IS - 3 SP - 107 VL - 14 UR - https://hdl.handle.net/21.15107/rcub_agrospace_141 ER -
@article{ author = "Rajković, Miloš and Vladisavljević, Goran and Ristić, Nikola and Jaksić, MM", year = "1998", abstract = "On the basis of an old Cominco, Trail. B.C., idea of preconditioning silver (0.8 wt%) alloyed lead electrodes for a proper passivation, optimal, chemically balanced and more economical process has been developed for use in Zn electrowinning. A relatively short time anodic polarization of Fb(As) electrodes in sulphuric acid containing fluoride ions, (as a stimulating agent for protective and compact layer formation of beta-PbO2), is found to give a compact, homogeneous, long lasting passivation layer of beta-PbO2. The presence of a small amount of F--ions in the passive layer of beta-PbO2 enables the passive oxide deposit to behave as long lasting, Monitoring of Pb-ions emission testifies that the preconditioned electrode will have more than ten years of life zinc electrowinning. An additional contribution is the exchanged chemical balance of manganese species in solution: the detrimental MnO2 production is dramatically reduced. The most important achievement of the process represents, winning of pure zinc.", publisher = "Central Electrochem Res Inst, Karaikkudi", journal = "Bulletin of Electrochemistry", title = "A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning", pages = "114-107", number = "3", volume = "14", url = "https://hdl.handle.net/21.15107/rcub_agrospace_141" }
Rajković, M., Vladisavljević, G., Ristić, N.,& Jaksić, M.. (1998). A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning. in Bulletin of Electrochemistry Central Electrochem Res Inst, Karaikkudi., 14(3), 107-114. https://hdl.handle.net/21.15107/rcub_agrospace_141
Rajković M, Vladisavljević G, Ristić N, Jaksić M. A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning. in Bulletin of Electrochemistry. 1998;14(3):107-114. https://hdl.handle.net/21.15107/rcub_agrospace_141 .
Rajković, Miloš, Vladisavljević, Goran, Ristić, Nikola, Jaksić, MM, "A preconditioning process for extended passivation of alloyed lead anodes in zinc electrowinning" in Bulletin of Electrochemistry, 14, no. 3 (1998):107-114, https://hdl.handle.net/21.15107/rcub_agrospace_141 .