Circular economy applied to the steel and metal surface treatment sector
Economia circolare applicata al trattamento superficiale di acciaio e metalli, nasce LIFE DIME
The European metallurgical industry generates 380,000 m³ of toxic liquid waste from pickling processes annually. The Chemirec® process, whose development on a demonstration scale under real operating conditions is being carried out thanks to the LIFE DIME project, is a circular economy solution that recovers materials of high added value in the galvanizing industry. During the third session of the 1st International Digital Congress on Desalination and Reuse – organized by the Spanish Association for Desalination and Reuse (AEDyR) – that was dedicated to Advances in processes and chemical products development, we had the opportunity to show the promising results obtained in the Chemirec® demonstration plant: 96.3% of the zinc (Zn) present in the input solution is recovered in the form of zinc chloride (ZnCl2) and can be reused as a flux in the bath prior to galvanizing; 416.4 kg of iron sulfate (FeSO4 · 7H2O) are obtained for each cubic meter of spent bath and can be used as fertilizer; and hydrochloric acid (HCl) is obtained with a concentration close to 14% suitable for reuse in a new pickling bath.