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Preventing waste by using a new pretreatment method in galvanizing plants for the galvanization of parts
- Umweltbundesamt (UBA)
Fertigstellung des Projekts:
Maschinen- / Anlagenbau
A new hot-dip galvanizing plant was conceived in such a way that no mixed pickles, which must be disposed of as special refuse, result when derusting the workpieces but only pure iron and/or zinc containing spent pickle liquors, which can be used as raw materials in the chemical industry. To this end the pickling bath for the zinc-afflicted workpieces (false-coated parts, zinc-afflicted racks) had to be separated spatially and organizationally from the production line degreasing, pickling, fluxing, galvanizing. By the separation of the pickling processes it is also possible to adjust the respective optimal pickling conditions.
The exhaust gases of the pickling and galvanization baths are collected and cleaned. The washed components HCl and NH3 are admitted again to the flux bath as ammonium chloride (NH4Cl). The powdery emissions in the cleaned exhaust gas only reach 1/25 of the permissible upper limit of 10 mg/cbm, for cadmium the values are even lower than the detection limit of 0,0002 mg/m³.
Autor/Projektleiter: Hans-Peter Damian
© cleaner production germany (Umweltbundesamt UBA)