Weathering Of Metallurgical Slag Heaps:
Multi-experimental Approach Of The Chemical
Behaviours Of Lead And Zinc
Author(s)
N. Seignez, D. Bulteel, D. Damidot, A. Gauthier
& J. L. Potdevin
Abstract
The production of lead and zinc in the Lead Blast Furnaces of metallurgical
factories produces a huge amount of slags. These slags are a Pb-Zn-rich vitreous
material with a CaO-SiO2-FeO-rich glass matrix containing metallic lead
droplets and Fe oxides. The resulting slag heap is exposed to weathering and can
be a source of chemical pollution. In this study, different experiments allow the
study of the behaviour of Zn and Pb during the weathering of slags. First, a
Teflon leaching column (ascending flux) equipped with samplers in order to
collect the fluid inside and at the outlet of the column was used. The second
experiment was a pure water flow on a polished section of slag. The third system
was an outdoor experiment where the slag was exposed to natural weathering
comparable to the heap. ICP-AES and ESEM-EDS have been used to follow the
evolution of the water chemistry and the slag compositions and textures during
the experiments. Two episodes of Pb and Zn releases were noticed at the column
outlet. A first brief episode might be caused by some colloids or slag dust
releases. The second episode essentially results from glass and metallic lead
dissolution. Hydrocerusite locally appeared in the column. Investigations carried
out on the polished sections show complex alteration patterns. They suggest that
the behaviour of the glass and of minor phases is closely linked to the local
structure and composition at the slag surface. Outdoor experiments show slower
kinetics than in the other experiments, but the alteration type is similar despite
some differences.
Keywords: metallurgical slag, iron-silica-lime glass, waste leaching, lead and
zinc releases.
Keywords
metallurgical slag, iron-silica-lime glass, waste leaching, lead and
zinc releases.
Related Book
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