Method for burning off carbonaceous dry metallic ash

The method comprises filling a tank (a1) with a metallic ash, venting ambient air from the tank, injecting air and/or oxygen to the tank by a tank bottom (b2), heating the tank to an ignition temperature, and agitating the metallic ash by tools, where: a proportion of carbon is below 3%; the steps of venting, injecting and heating take place from time to time, in an alternating sequence or in pairs or all at the same time; the steps of venting and injecting take place from time to time; and the bringing step takes place punctually in subsets of the metallic ash. An independent claim is included for a device for burning carbon-containing dry metallic ash.