Pickling bath regeneration

Crystallisation process for pickling baths

The crystallisation process presented here was developed by Schulz+Partner in collaboration with Cesus/Areva (France). It is used for pickling baths to recover acids and separate metals.

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The following requirements must be observed:

  • The acids must be volatile, such as nitric, hydrochloric or hydrofluoric acid.
  • Acids such as sulphuric and phosphoric acid remain as a further residue. 

The following recovery rates are possible:

  • Nitric acid up to 99%
  • Hydrofluoric acid between 40 and 99% depending on metal and metal concentration
  • Water between 85 and 95% (depending on the proportion of water-binding crystals)
  • Metal up to 100%

Advantages of the process:

  • No waste water, all components are recovered and separated
  • Process is operated in a vacuum, thereby reducing the risk of corrosion

We have previous experience with:

  • zirconium
  • titanium
  • stainless steels
  • high-alloy stainless steels