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The incinerator bottom ash (IBA) produced by Waste to Energy (WtE) plants are a source of valuable non-ferrous metals, including aluminium, copper, silver and gold. The majority (around 70%) of these metals are typically found in the fine fraction of the IBA. As part of the X2conmat™ process, the Kanadevia Inova Grate for Riddlings (GfR) is a useful modification designed to improve metal recovery in WtE plants with conventional wet IBA discharge.
Advanced metal recovery is achieved by introducing a screening grate element with slits of a defined width into the final combustion grate zone. This enables the valuable fine IBA fraction, which accounts for around 40 wt% of the total IBA, to be extracted in a dry state. Separation is assisted by the mechanical sieving movement of the grate superimposed on the feed and by special “deflectors” on the grate. Dust-tight, dry discharge of the separated fine fraction for further processing ensures high metal recovery rates and high-quality recovered metals.
The remaining bottom ash is discharged using the conventional wet extraction method. GfR optimises both the quantity and quality of the recovered metals. Reducing the metal and water content in the remaining residue also lowers transport costs and landfill gate fees.
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Fully enclosed equipment means no dust emissions
More efficient metal recovery with high precious metal content
Preserves metal quality
Reduces transport costs and landfill gate fees
Provides environmental benefits and supports the circular economy because recycling of recovered materials improves the CO₂ footprint