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Exhibit 3-36. Materials of Construction for Electrodes Used for Common Electrowinning Applications

Electrolyte                    Cathode Material                Anode Material
Cadmium Cyanide                  2, 3, 4                             3, 6, 9
Cadmium Sulfate                     3, 4                               6, 9
Copper Cyanide                       4                                  10
Copper Persulfate Microetch         14                                  14
Copper Peroxide Microetch           14                                  14
Copper Pyrophosphate                14                                  14
Copper Sulfate                   2, 3, 4                          1, 7, 10, 11
Gold Cyanide                     2, 3, 4                              7, 11
Lead Fluoborate                     4                                   12
Lead Sulfamate                      4                                   7
Nickel Sulfate                   1, 2, 3, 5                         7, 10, 11
Silver Cyanide                   2, 3, 4                             3, 7, 11
Tin Alkaline                       2, 3                               8, 11
Tin-Lead Fluoborate                2, 3                               8, 11
Zinc Alkaline                      13                                   7
Zinc Cyanide                        1                                  10
Zinc Unspecified                    1                                  10
 
 

Legend

1: Proprietary; 2: Stainless steel mesh; 3: Stainless steel sheet; 4: Reticulated copper coated; 5: Reticulated nickel; 6: Carbon fiber; 7: Dimensionally stable anodes (DSA®); 8: Ebonex®; 9: Ebonex® iridium oxide or platinum coated; 10: Lead alloy; 11: Platinum clad titanium, niobium, tantalum; 12: Graphite; 13: Zinc mesh; 14: Unknown

Sources: Data provided by Eltech International Corporation, Kinetico Engineered Systems, Eco-Tec Inc., and Memtek Corporation. These companies manufacture electrowinning equipment that employ either flat plate or reticulate cathodes. Also, the data are based on common material usage as identified from the literature.


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