The acid recovery equipment in the anodic oxidation electroplating industry consumes about 10% of the acid solution for product disposal. A large amount of acid solution is carried out through the product, and the acid tank enters the washing tank. Due to the high viscosity of the acid solution, the acid solution carried out can reach up to 90%, resulting in huge waste of phosphoric acid.

By collecting the acid water from the first water washing tank behind the chemical polishing tank, and undergoing systematic purification and purification treatment, the specific gravity is increased to above 1.7, which can be reused, reducing production costs and sewage treatment costs.