Titanium Anode for Electrowinning of Gold,Silver

Electrowinning of Gold, Silver, Palladium & Rhodium

Titanium Anode for Electrowinning of Gold,Silver

Electrowinning is an electrolytic process, which is largely use in production of gold, silver, zinc, chromium, cobalt, manganese, and the rare-earth and alkali metals.

Most metals occur in nature in their oxidized form (ores) and thus must be reduced to their metallic forms. The ore is dissolved following some preprocessing in an aqueous electrolyte or in a molten salt and the resulting solution is electrolyzed. The metal is deposited on the cathode (either in solid or in liquid form), while the anodic reaction is usually oxygen evolution.

In the electrowinning industry, lead dioxide anode and Mixed Metal Oxide (MMO) anode are the two common choices. However, the lead dioxide anode are found of these disadvantages: heavy environmental pollution, high energy consumption, fragile, lead waste, hardly to produce into various shapes, coating is easily to drop off.

With environmental concerns increasing and pollution stringent control, MMO anodes become widely used in the metal electrowinning industry since this MMO titanium anode for metal electrowinning offer a cleaner alternative and significant power savings over lead dioxide anode.

This MMO anodes are exclusively used in the metal recovery system. The system is composed of the deposition of an electrolytic cell at the cathode, in the metal you want to obtain. MMO coated Titanium Anodes that are immersed in a fluidized bed of non-conducting particles, this ensures that there are high levels of mass transport and low power requirements. The metal recovery system is used for the efficient recovery of metals from dilute solutions where conventional electrolysis cannot be considered.

The metals that can be recovered by this method are copper, nickel, zinc and cobalt, and used in the recovery of cyanide-based electrolytes of gold, silver, copper, zinc and cadmium cyanide is electrochemically destroyed, due to the enhanced anode efficiency. Different metals plate out at different voltages so application if the different voltages will allow all metals to be recovered from a mixed metal effluent.

Titanium substrate shapes: squares, rectangular sheets, strips, foils, plates, expanded metal and meshes, corrugated and perforated metal plates, wires, rods, discs, bars, tubes or according to clients’ requirements.

Coating: Including but not restricted to:  iridium coating (Ir and IrO2), ruthenium coating (Ru and RuO2), and platinum coating or platinized (Pt, PtOx),.titanium dioxide (TiO2),  niobium pentoxide (Nb2O5) and tantalum pentoxide (Ta2O5) or a combination to address any specific situation.

Titanium anode operating lifespan: Up to clients’ specific requirements. Generally, the circulated electric charge per unit surface area, It reaches several millions of ampere-hours per square meter (MAh/m2).  Moreover, the consumption rate of the mixed metal oxides coating is usually low in the order of few milligrams per ampere-year that ensures a long service life.

Saga is able to supply both new anodes and the recoating and repair service for anodes used for all of these processes, in particular the formulation of the coating for sulfate, has been designed to have a long duration and a low energy consumption.