ZERMEG II – Zero emission retrofitting method ... - Fabrik der Zukunft

Now, once a month the concentration in the tanks is analysed by an external laboratory. Onthe basis of the results of these analyses, the volumes of acids to be topped are calculated(by using the software Pickling Optimizer of the Austrian company Körner(www.zermeg.net) and carefully controlled. So the concentrations of iron and acid are keptin an optimum range.Dezincing and pickling today is separated carefully. One acid tank is used exclusively fordezincing of parts for reprocessing and racks. This acid is sold to a company that recoversthe zinc from the solution. By this separation, the zinc concentration in the pickling tanks canbe kept very low. This allows for a very long useful life of these acids.As a first result, during the first six month of 2004 the specific consumption of hydrochloricacid could be reduced by more than 50 %. The spent acids could be completely separatedinto a fraction rich in zinc and one practically free of zinc. Both fractions are given away asbyproducts. The zinc free acid is used in the production of waste water treatment chemicals.24