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ElectrorefiningElectrorefining and and ElectrowinningElectrowinning CappingCapping BoardsBoards
Ficha Ficha TecnicaTecnica / Data / Data SheetSheet
INTRODUCTIONINTRODUCTIONINTRODUCTIONINTRODUCTION
In the hydrometallurgical industry, it is of common practice to refine metal by electrolysis in electrolytic cells especially designed for this purpose. The metals that are refined are usually conventional metals like copper, zinc, nickel,cobalt or precious metals like silver, platinum
or gold, and others.It is also of common practice to use metal plates as anodes or cathodes or both. These metal plates most often weigh several hundred
pounds, have a given thickness and include the metal to be refined or used to carry the electric current. Once installed, the plates usually hang on lateral sidewalls of the electrolytic cells. In use, these heavy plates are immersed into the cells in parallel relationship and are
used as anodes, cathodes or both, depending on the affinity and properties of the metal being refined.In order to precisely and properly position the electrodes, it is of common practice to place a member called a “capping board” onto the top surface of each lateral sidewall of the cells. These capping boards are used to position the plates with respect to each other. They are
also used as electric insulators between adjacent cells and/or each electrode and/or the ground.j / / gIn practice, the capping boards are used not only as supports to position the electrodes, but also as supports to avoid damage to the
masonry or concrete forming the lateral sidewalls of the cells during the insertion and removal of the heavy electrodes.As mentioned herein above, the insulating capping boards are used to hold the electrodes at very precise positions. They are also often used in combination with other components of the electrolytic apparatus, such as electrically conductive contact bars (Bus bars) whose purpose is to allow electrical connection between the ends of the anodes and cathodes located in the adjacent cells. Thus, the combined use of capping boards and contact bars has the particularity of allowing insulation and distribution of electric current at the same time.use of capping boards and contact bars has the particularity of allowing insulation and distribution of electric current at the same time. The capping boards may also be precisely arranged in relation to other components, depending on the specific electrolytic process or cell
arrangement.The installation of capping boards also presents numerous difficulties, as both the capping boards and the electrical plates are often large, heavy and awkward to handle. In addition, the precision fit of the capping board with respect to the plate and cell dimensions requires
certain manufacturing standards and implies certain limits on the form and construction of the capping board.
Capping BoardsCapping Boardspp gpp g
•• CustomCustom DesignsDesigns‐ Electrowinning‐ Electrorefining
•• AccurateAccurate PositioningPositioning‐ Excelent Dimensional Tolerances
•• High Grade High Grade MaterialsMaterials‐ High Compression StrenghtHigh Compression Strenght‐ High Electrical Resistance‐ High Chemical Resistance‐ High Temperature Resistance‐ High Temperature Resistance
MechanicalMechanical Test Test
Thermal Test
Dimensional Check
Impact Test
Dimensional Check
ChemicalChemical TestTest
Resistencia Resistencia QuimicaQuimica‐ %Weight H2SO4: 15 ‐ 90%‐ Temperature : 20 ‐ 70 ºC‐ Time: 240 hrs.
ThermalThermal TestTest
Temperature (300ºC)
Thermal TestTemperature Test : 300ºCTemperature Test : 300 CTest Duration : 24 hrs.
Test Test CappingCapping BoardsBoards
Thermal Test Impact Test
Test Parameters
ThermoThermo –– ChemicalChemical CappingCapping BoardsBoards TestTest
Test Parameters‐Weight Concentration H2SO4: 90%‐ Temperature : 70 ºC‐ Time : 200 hrs.
Standard Material
Cell Material PolimericConcrete
Exma High Grade Material
Test Parameters- Weight Concentration H2SO4: 90%- Temperature : 70 ºC- Time : 200 hrs.Time : 200 hrs.
Test Parameters- Weight Concentration H2SO4: 90%- Temperature : 20 ºC- Time : 1000 hrs.
XoXo : : ExmaExma High Grade MaterialHigh Grade Material
Rangos Usos MaterialRangos Usos Material
High Grade Material High Grade Material CappingCapping BoardsBoards%
Weight 20ºC 30ºC 50ºC 70ºCH2SO4
20 C 30 C 50 C 70 C
5 o.k o.k o.k o.k15 o.k o.k o.k o.k30 o.k o.k o.k o.k50 o.k o.k o.k o.k
75 o.k o.k o.k o.k
- Low SurfaceDiscoloration- Mass loss0 02%
90 o.k o.k o.kMass loss0.02%
- Good ImpactResistance- ThermalResistance 260ºC
Capping Boards ElectrowinningCapping Boards ElectrowinningSistema Barras Alta Densidad Corriente Ánodo EqualizadoSistema Barras Alta Densidad Corriente Ánodo EqualizadoSistema Barras Alta Densidad Corriente Ánodo EqualizadoSistema Barras Alta Densidad Corriente Ánodo Equalizado
CappingCapping BoardsBoards ElectrowinningElectrowinning CheckCheck
CappingCapping BoardsBoards ElectrowinningElectrowinningSistema Barras Corriente Sistema Barras Corriente AnodoAnodo EqualizadoEqualizado
CappingCapping BoardsBoards ElectrowinningElectrowinningSistema Barras Corriente Sistema Barras Corriente AnodoAnodo ‐‐ CatodoCatodo EqualizadoEqualizado
CappingCapping BoardsBoards ElectrowinningElectrowinningSistema Barras Corriente Sistema Barras Corriente AnodoAnodo EqualizadoEqualizado
CappingCapping BoardsBoards ElectrowinningElectrowinning Barra Barra SpoolSpoolpp
CappingCapping BoardsBoards ElectrorefinacionElectrorefinacion
CappingCapping BoardsBoards ElectrowinningElectrowinning Alto Grado Alto Grado