The selection of titanium anodes for wet metallurgy requires comprehensive consideration of electrolysis environment, coating performance, current density, and process adaptability. The following are the key selection principles and technical points:

1. Coating matching electrolytic environment

Acidic system: ruthenium iridium composite oxide coating is preferred, suitable for sulfate or chloride systems with pH 1-4, resistant to strong acid corrosion and low oxygen evolution overpotential.

High temperature environment: If the electrolysis temperature exceeds 60 ℃, platinum titanium anode should be used, which can operate stably for more than 5000 hours in 600 ℃ molten salt electrolysis.

Avoid media: Electrolytes containing fluoride ions or phosphate ions can corrode the titanium substrate, causing coating peeling, and must be strictly avoided.

2. Size and current density adaptation

Size specifications: It needs to match the space of the electrolytic cell, and the length, width, and thickness should meet the requirements of current distribution to avoid local overheating.

Current density: Conventional hydrometallurgy recommends 1000~3000 A/m ². Excessive current will accelerate coating loss, while insufficient current will reduce efficiency.

3. Quality of substrate and coating

Titanium substrate: The purity should be ≥ 99.6%, and the surface roughness Ra value should be controlled between 1.6~6.3 μ m to ensure the adhesion of the coating.

Coating thickness: The recommended thickness for ruthenium iridium coating is 5-20 μ m, with a uniformity error of<± 5%. Thin coating is prone to wear, while thick coating affects conductivity.

4. Maintenance and lifespan optimization

Temperature control: The electrolyte temperature should be ≤ 60 ℃, and the cooling system should be strengthened for high temperatures.

Surface cleaning: Regularly remove the gas accumulation on the anode surface to maintain catalytic activity.