Oxygen & Other | Electrowinning



Otherwise known as Metal Winning.


With environmental concerns increasing, heavy metal-containing effluent from the electroplating industry is under much more stringent control.  Electrowinning is a means by which the metals from waste water streams are recovered in order for these metals to be re-used or sold.


NMT® Electrodes manufactures Mixed Metal Oxide and Platinised Titanium Anodes which have gained acceptance in the Metal Electrowinning Industry. Mixed Metal Oxide Anode technology has all but replaced lead anodes as the anodes of choice with industries becoming more environmentally concious. Mixed Metal Oxide Anodes offer a cleaner alternative and significant power savings over lead anodes.


NMT® Electrodes Mixed Metal Oxide and Platinised Titanium Anodes are exclusively used in the BEWT CHEMELEC metal recovery system. The system is composed of closely spaced Mixed Metal Oxide coated expanded metal Titanium Anodes that are immersed in a fluidised bed of non-conducting particles (inert glass beads), this ensures that there are high levels of mass transport and low power requirements. The CHEMELEC metal recovery system is used for the efficient recovery of metals from dilute solutions where conventional electrolysis (the driving of a non-spontaneous reaction with DC to discharge ions into electrolyte) cannot be considered.


The metals that can be recovered by this method are copper (Cu), nickel (Ni), zinc (Zn) and cobalt (Co), and used in the recovery of cyanide-based electrolytes of gold (Au), silver (Ag), copper (Cu), zinc (Zn) and cadmium (Cd)- 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.   


We also manufacture Mixed Metal Oxide Anodes for other metal recovery systems and fabricate these anodes to customers' specifications.


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