Etching solution recovery copper titanium electrode
In the production process of circuit boards, copper sinking, electroplating, stripping, etching and other processes all generate a large amount of waste water. According to different processes, it is divided into alkali etching and acid etching. Copper can be recovered individually or in combination. Metal is electrolytically extracted in sulfuric acid solution, and oxygen is precipitated on the anode. It is a very important issue to choose the appropriate anode material. Titanium electrode with tantalum-iridium series coating has low oxygen overpotential and is not corroded by electrolyte. The iridium oxide coating shows excellent electrolytic durability. The initial anode potential is 1.51V, after 6000 hours, it is 1.64V, and the coating weight loss is 0mg /cm2 . When lead-based alloys are used in electrolysis production, containing Sb6% to 15%, or Ag1%, the lead anode will dissolve, consume the anode material, and affect the life of the anode, and the lead dissolved in the solution will be in the solution. The precipitation on the cathode increases the lead impurities in the metal and reduces the quality of the product. The ruthenium-based coating will be seriously damaged under this working condition, so it is not suitable for use. passivated.
