Controls for plating waste recovery systems

Automatic control techniques used with continuous closed- loop recovery systems are discussed. Integration of the recovery loop with one or more plating- rinsing lines is described. Variables considered are liquid levels of plating, rinse and surge tanks; temperature of plating solutions and evaporators; pressures within evaporators and at pump discharges; evaporation rate, and concentration of plating chemicals and impurities within recylced plating solutions and rinse water.