New lead dioxide anode in Electrowinning instead of traditional lead anodes in the Electrowinning of non-ferrous metals

Mar 22, 2024

      In the hydrometallurgical industry of Electrowinning non-ferrous metals (EW) .Common solution systems include chloride solution, sulfate system solution and nitric acid system solution. The traditional anodes used in this industry are graphite and lead alloy anodes. In actual operation, there are many problems such as high battery voltage, heavy weight, uneven current density, pollution solution, short life, etc., especially secondary pollution problems, which affect the purity and quality of cathode Electrodeposited products.
    In recent years, as environmental protection requirements have become increasingly stringent, the quality requirements for cathodically deposited metal products have continued to increase. Traditional graphite and lead anodes (lead-tin alloy anodes) have gradually been replaced by titanium-based oxide-coated anodes (DSA anodes).
    After years of research and practice, UTron Technology has produced special lead dioxide anode in Electrowinning non-ferrous metals with different coating formulas suitable for various solution systems. In the actual production process of our customers, we have effectively improved purity and quality of cathodically deposited metal , and reduced energy consumption, saved maintenance costs, and achieved significant economic benefits for our customers.

The operating data of lead dioxide anode in Electrowinning metal  are as follows:

Applications: Electrowinning of copper, nickel, cobalt and zinc
   1.Product specifications:Commonly used sizes are 600*800mm, 800*1000mm,900*1200mm (customized sizes are also available)
   2.Anode palte lifespan: >2 years
   3.Electrochemical performance and lifespan test (reference standard HG/T2471-2007 Q/CLTN-2012)
Titanium-based lead dioxide technical indicators:
   1.The middle layer of the anode plate coating is made of α-PbO2 and β-PbO2, and the conductor rod is made of titanium-copper composite rod. The anode plate is connected to the conductor rod by welding.
   2.Thickness of the base material titanium mesh is 2mm, and the thickness of coating is not less than 0.6mm each side. Thickness of the finished product should be no less than 3.5mm. The surface of the board should be smooth and the finished product should be free of delamination, cracks or other impurities.
   3.Plate verticality: the maximum deviation between the upper and lower plate surfaces is less than ±6mm.
   4.Life span: Resistant to corrosion and bending, with a service life of more than 2 years.
  5.After processing, the flatness and surface tolerance should be within ± 5mm, and the diagonal tolerance should be less than 3mm
  6.Other requirements must be processed strictly according to the drawing.      
   Comparison between titanium-based lead dioxide anode and traditional lead anode,
lead dioxide anode show the following advantages in production systems:
   1.Little pollution to electrolyte,saving cost of Impurity removal system.
   2.Not easily deformed dissolved, which will not cause the anode to deform due to self-dissolution and pollution solution to make the current density uneven and effect quality of the cathode product.
   3.The current efficiency is high.lead dioxide anodes is 93-95% which produced by UTron technology, while the traditional lead anode is only 89-90%.
   4.The cell voltage is low. lead dioxide anode is 2%-3% lower than that of the lead anode, and the energy-saving effect is significant.
   5.Able to work under high current intensity. Traditional lead anodes will dissolve quickly under high current, while titanium-based lead dioxide anodes can withstand currents of more than 1000A/m2, suitable for the short-term high-output requirements in production.
   6.Due to the heavy weight and soft material of the lead anode, it is easy to become thinner and deformed, causing the nickel cathode plate to be easily deformed, requiring workers to frequently level it, cause high labor intensity is high. In addition, lead is a heavy metal with significant toxicity that can affect the nervous system and lead to serious environmental pollution.
In comparison,Lead dioxide is lighter, less susceptible to deformation, and easier to maintain, reducing maintenance and labor costs.Reduce labor intensity and improve the working environment.
   7.Titanium-based lead dioxide anode can save about 8% in energy consumption of Electrowinning(EW) . In addition, improve the quality of the cathode product and Increase sales price with considerable benefits. In summary, the new lead dioxide anode shows better economic and environmental performance in non-ferrous metal electrodeposition, improves product quality and reduces production costs.