When residual waste is incinerated, various non-combustible materials are left behind: ashes and slags, bricks, ceramics – and also metals such as iron, aluminum and copper. With Brantner Slagtory technology, even the smallest metals, the thickness of a human hair, can be removed from the slag. These are crushed, washed, sieved and the metals and salts removed. Approximately 80% of the resulting ash and slag can be recycled and does not have to be disposed of in landfills. This saves large amounts of CO2.

The metals filtered out of the slag can be returned back into the cycle. This can save up to 95% energy and 3.57 tonnes of CO2 per tonnes of recycled aluminium compared to primary aluminium, for example.