Ferrous Sulphate
Recovery from discarded Pickling Bath
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Project, Trade Technology Information - Contents on CD ROM

Information profile @ a Glance
  • PICKLING is the chemical removal of surface oxides or scale from steel by immersion in an aqueous acid solution. While wide variations are possible in the type, strength and temperature of the acid solutions used, sulfuric and hydrochloric acids are the most common pickling acids for carbon steel.
  • Pickle liquors become contaminated with dissolved metals through use. As the metal concentration increases, the free acid concentration decreases and pickling efficiency
    drops. Additions of fresh concentrated acid are made from time to time to rejuvenate the bath but eventually it becomes spent and must be discarded
  • Recovery of spent pickle liquors can potentially reduce many of the costs.
  • Plants are for regenerating exhausted pickling solutions from sulfuric acid pickling baths
  • In these plants, the ferrous sulphate accumulated in the acid is crystallized by cooling and separated as ferrous sulphate heptahydrate
  • The pickling of mild steel sheets with sulfuric acid produces an aqueous waste stream containing ferrous sulfate and sulfuric acid. Cooling of that solution forces ferrous sulfate to crystallize as FeSO4.7H2O. From the viewpoint of the mother liquor composition, this is a way to purify the solution.
  • At the same time, the seven molecules of water that is removed with the crystallized ferrous sulfate causes the reconcentration of the sulfuric acid. The solution thus treated can be recycled to the pickling bath.
  • Ferrous sulphate is a compound largely used in agriculture

Basic Information

  • About Sulfuric Acid Pickling and Recovery

Technology Information

  • Recovery of spent sulfuric acid from steel pickling operations
  • Recovery Process of
    pickle liquors
  • Mass Crystallization from solutions
  • Spectrophotometric determination of iron(III) and total iron by sequential injection analysis technique
  • Waste Pickle Liquor recovery process patent


  • Pickling acid recovery unit purifies spent sulfuric acid
  • Best Available Techniques in the Ferrous Metals Processing Industry
  • Recovery of acid and oxide by-products from spent pickling liquor
  • Waste Iron Sulphate

Project / Equipment Suppliers

  • Regeneration plants for sulfuric acid pickling
  •  Equipment supplier
  • Project Consultant
  • Red iron oxide - project profile

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