ECN publication
Leaching characteristics of lead-zinc primary smelters slags: final report BRE2-CT-94-0585
Published by: Publication date:
ECN 1997
ECN report number: Document type:
ECN-C--97-098 ECN publication
Number of pages: Full text:
48 Download PDF  

Lead and zinc primary smelters in Europe produce and dispose every yearabout 1 Mt of slag. The objectives of the ECN contribution to the Brite Euram project on valorization of primary lead and zinc slags are to facilitate the beneficial uses for Pb and Zn slags by determining their leaching characteristics under a number of different exposure conditions and thus to define the boundary conditions for environmentally sound application of slags. This type of characterization can be used at the same time to model release and to identify means to improve leaching properties of slag. While in recent years, significant improvements in both 'conventional' (lead blast furnace or ISF) or 'new' (Kivcet - QSL) processes have been achieved, the solid slags generated by these processes are still largely dumped. The main goal of the work is to reach a common approach and understanding of the leaching properties of 'metallurgical slag'. This implies a better understanding of the phenomena involved in the leaching process in order to be able to adapt, if necessary, the metallurgical process to produce a slag of which chemical composition, particle size and morphology, will result in reduced leachability. Slags from other industrial processes such as blast furnace slag, steelslag and phosphate slag are used in coastal protection and in roadbase applications. The environmental consequences of these applications have been shown to meet strict utilisation criteria. For Pb and Zn slag, a similar situation is pursued. 28 refs.

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