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