Extraction treatment of heavy metals : REZEDA process description

REZEDA process description
Extraction treatment of heavy metals

Authors : Pierre-Emmanuel CHARPENTIER,, Laurent RIZET, Cyril TROUILLET

Publication date: December 10, 2007 | Lire en français

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2. REZEDA process description

The REZEDA process (REcyclage du Zinc par Électrolyse des Déchets d'Aciérie - recycling zinc by electrolysis of steelworks waste) is used to extract metals from waste. It is particularly suitable for waste containing significant levels of zinc (over 10% by mass). The REZEDA process uses the principles of extractive hydrometallurgy, more specifically in an alkaline medium.

2.1 Targeted waste

The by-products likely to be recovered by this process are essentially the following:

EAF and arc furnace dusts recovered after flue gas treatment, with zinc contents ranging from 20 to 35%. The French deposit is around 100,000 tonnes per year.
Metal hydroxide sludge (MHS) from the purification of wastewater from surface treatment workshops. These sludges contain lead,...

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REZEDA process description