The Waelz process is a classic method for treating steel plant dusts containing zinc and lead. This process makes especially exacting demands on the off-gas cleaning system because, in most cases, the feed material is heavily contaminated with organic and inorganic components. As a result of the thermal treatment of the residues, dioxins and furans are liberated on the raw-gas side, requiring the installation of additional off-gas cleaning systems.Using as examples two Waelz kiln plants, this article describes the primary measures that minimize the formation of dioxins and furans.
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