Electrowinning, also called electroextraction, is the electrodeposition of metals from their ores that have been put in solution via a process commonly referred to as leaching. Electrorefining uses a similar process to remove impurities from a metal. Both processes use electroplating on a large scale and are important techniques for the economical and straightforward purification of non-ferrous metals. The resulting metals are said to be electrowon.
In electrowinning, a current is passed from an inert anode through a liquid leach solution containing the metal so that the metal is extracted as it is deposited in an electroplating process onto the cathode. In electrorefining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte, the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes.
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.
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 fluidised 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.
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 orplatinized (Pt, PtOx), titanium dioxide (TiO2), niobium pentoxide (Nb2O5) and tantalum pentoxide (Ta2O5) or a combination to address any specific situation.
Titanum 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.