Method of reprocessing waste materials containing metals of value in a fluidized bed furnace, comprising the phases of: I. Starting up the fluidized bed furnace; and II. Continuously reprocessing the waste materials, characterized in that the fluidized bed furnace is operated autothermally during phase II of continuously reprocessing the waste materials containing metals of value, wherein the fluidized bed furnace comprises - a steel vessel having a refractory lining, - an inlet for waste materials containing metals of value, - at least one outlet for material discharge (110, 111), containing valves, - at least one inlet for the supply of process air and - a preheating device for preheating the process air, - a fill level measuring device, preferably based on a measurement of a pressure differential between two measurement points (112, 113), of which one measurement point is disposed above and one measurement point below the material bed, - at least one manometer for measurement of pressure in the interior of the steel vessel, and a controller set up to control the fill level measuring device in such a way that, by means of the measurement of pressure differential with the pressure sensors (112, 113), and taking account of the process temperatures of 630°C to 730°C in the continuous phase II, the fill level of the steel vessel is kept within a range from 15% to 25%, wherein - the material discharge is effected by gravity via the actuation of the valve in the at least one outlet (110, 111); - and/or the process temperature is kept within the range from 630°C to 730°C, wherein the process air is preheated to a temperature in the range of 45°C-130°C by means of the preheating device; - and/or the pressure in the interior of the steel vessel is adjusted within the range between -0.2 and -0.3 mbar by control of an offgas suction device. I. Starting up the fluidized bed furnace; and II. Continuously reprocessing the waste materials, characterized in that the fluidized bed furnace is operated autothermally during phase II of continuously reprocessing the waste materials containing metals of value, wherein the fluidized bed furnace comprises - a steel vessel having a refractory lining, - an inlet for waste materials containing metals of value, - at least one outlet for material discharge (110, 111), containing valves, - at least one inlet for the supply of process air and - a preheating device for preheating the process air, - a fill level measuring device, preferably based on a measurement of a pressure differential between two measurement points (112, 113), of which one measurement point is disposed above and one measurement point below the material bed, - at least one manometer for measurement of pressure in the interior of the steel vessel, and a controller set up to control the fill level measuring device in such a way that, by means of the measurement of pressure differential with the pressure sensors (112, 113), and taking account of the process temperatures of 630°C to 730°C in the continuous phase II, the fill level of the steel vessel is kept within a range from 15% to 25%, wherein - the material discharge is effected by gravity via the actuation of the valve in the at least one outlet (110, 111); - and/or the process temperature is kept within the range from 630°C to 730°C, wherein the process air is preheated to a temperature in the range of 45°C-130°C by means of the preheating device; - and/or the pressure in the interior of the steel vessel is adjusted within the range between -0.2 and -0.3 mbar by control of an offgas suction device. - a steel vessel having a refractory lining, - an inlet for waste materials containing metals of value, - at least one outlet for material discharge (110, 111), containing valves, - at least one inlet for the supply of process air and - a preheating device for preheating the process air, - a fill level measuring device, preferably based on a measurement of a pressure differential between two measurement points (112, 113), of which one measurement point is disposed above and one measurement point below the material bed, - at least one manometer for measurement of pressure in the interior of the steel vessel, - the material discharge is effected by gravity via the actuation of the valve in the at least one outlet (110, 111); - and/or the process temperature is kept within the range from 630°C to 730°C, wherein the process air is preheated to a temperature in the range of 45°C-130°C by means of the preheating device; - and/or the pressure in the interior of the steel vessel is adjusted within the range between -0.2 and -0.3 mbar by control of an offgas suction device.