Less environmental impact More surface quality

Acid regeneration

During chemical descaling, the acid used is enriched with dissolved metals and sediment which reduces both the speed and effectiveness of the pickling process. This in turn reduces the throughput and surface quality.
For consistent pickling and treating conditions, Steuler Anlagenbau designs and delivers cost-effective regeneration processes and plants for treating and recovering acids, metals and water which are tailored to the specific needs of our customers. We thereby make a valuable contribution to reducing environmental pollution while satisfying the applicable regulatory provisions.
  • Steuler Acid Microfiltration (SAM) separates the insoluble solids that accumulates in the pickling liquor and, concentrates and disposes or recycles them using a continuous microfiltration process.
  • Steuler Acid Purification Unit (SAPU) separates the free acid from the dissolved metals using a resin bed (retardation) and returns it to the pickling line - for use with all pickling liquors, including HF/HNO3, H2SO4, HF/H2SO4 and HCl/HF.
  • Steuler Cooling Crystallization Unit (SACC) separates the free sulphuric acid H2SO4 by crystallizing out the dissolved metals as metal sulphates (FeSO4 x 7 H2O).
  • Steuler Total Acid Regeneration Unit (STAR) ) For recovering the free and bound acids, metals and water using a combination of membrane, crystallization and thermal processes. This reduces operating costs and environmental impact as the regenerated acids are fed back into the pickling process as fresh acids and the metals into the production process as metal oxides.

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