Difference between revisions of "Pickling in metal industry"
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Revision as of 15:19, 24 November 2010
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- 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
