Pickling in metal industry

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• Description of the process

• Pickling flowsheet

Literature: BAT Surface Treatment of Metals & Plastics, 2006

• Typical parameters of the process

Process	Temperature [°C]	Heat transfer medium	Residence time	Chemicals	Concentration	Details	Literature
Pickling				Acid pickling agents (hydrochloric or sulphuric acids are normally used; nitric, hydrofluoric or phosphoric acid or mixtures of acids are used in special cases; fluoride- containing solutions for realibly pickling certain alloys)			BAT for the surface treatment of metals and plastics, August 2006
Pickling of iron materials	~60			Acid agents (wetting and emulsifying agents)	sulphuric acid: 25%	Derostind and descaling of iron material
Pickling and descaling	30-35			Hydrochloric acids	18-22
Pickling of cast iron	35-40			Hydrochloric acids	20-25
Pickling of aluminium				Nitric acids	<150 g/l

• Pickling

Literature: BAT for the Surface Treatment of Metals & Plastics, 2006

• Energy losses from the surface area of heated process solutions

Image: Pickling flowsheet5.jpg

LITERATURE: BAT for the Surface Treatment of Metals and Plastics, May 2005

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