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Graphic element Research > Growth > Research projects > Previous projects > Industrial Processes > Recovery of iron chloride from galvanisation acid waste
Graphic element Recovery of iron chloride from galvanisation acid waste
     
 
A new approach to hot dip galvanisation allows the recovery of market standard iron chloride and zinc from waste acid effluents, meaning environmental benefits and lower costs.
 

Hot galvanising is now the second most used method, after painting, for protecting metal against corrosion. The market for galvanisation is increasing at a constant rate of about 10 % per year. One very significant problem for the hot galvanising industry, however, is the production and release of considerable volumes of dangerous by-products, mainly in the form of used acid baths. The destruction of these effluents at approved centres is among the highest budgetary costs in the galvanising industry.

This project concerned the development of a process for recovering market standard iron chloride from waste pickling and acid baths. The new concept is centred around a reorganised non-polluting hot dip galvanisation workroom. Galvanisation bath management has been completely reworked to obtain a production line meeting the strictest environmental standards. The scouring solutions, instead of being rejected, are valorised through transformation of the iron-containing element which can then be used as a coagulant in water treatment. Zinc recovery has also been optimised.

Project partners have been strongly urged to continue and expand on their results and a second project is now underway.

Cordis RCN: 29263
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