ZERO PLUS - Best Technologies applied to cyanide copper rinses (Barrel Line)

The treatments of cyanide baths and their rinses in a closed loop by means of techniques such as vacuum evaporation are considered as BATs in the BREF document “Surface Treatment of Metals and Plastics”. The ZERO PLUS Project proposes the combined use of vacuum evaporation, catalytic anodic oxidation and electrodeposition as an interesting solution for the full recovery of the drag-outs from the bath to the first recovery rinse and in situ removal (instead of at the WWTP) of cyanide, COD and heavy metals dragged out to a second recovery rinse. The combination of catalytic anodic oxidation and electrodeposition ensures the presence of very low levels of cyanide, COD, and parasite metals in the second recovery rinse, as well as the optimum quality of its waters.