METHOD AND DEVICE FOR TREATING MATERIALS CONTAINING PRECIOUS METALS

摘要

The inventive recycling oven for treating explosive materials containing precious metals with organic portions, the combustion of which is associated with important energy release, comprises a switching device for alternating the a combustion chamber between the following operating modes consisting: A) in pyrolysing or carbonising, under a protective gas, in an atmosphere containing oxygen in a quantity equal to or less than 6 % by weight and B) in oxidatively combusting the carbon-containing organic portions, wherein the oven comprises an indirect heating and a control for determining, by means of a sensor, in particular a pressure sensor, the end of pyrolysis or carbonisation, and for controlling the switching system in such a way the oven chamber is supplied with air or oxygen upon the pyrolysis or carbonisation is over. The stages A) and B) are carried out one after the other in the indirectly heated oven chamber, wherein a charge is not changed and the oven is not opened, at the stage A), a low-oxygen atmosphere, whose oxygen content is equal to or less than 6 %, is adjusted in the oven chamber by rendering it inert with the aid of a protective gas and the stage B) is carried out by introducing air or oxygen immediately after the end of a recyclable material pyrolysis or carbonisation. The incorporation of liquid or liquefied substances is controlled along with pyrolysis by means of at least one post-combustion parameter, in particular with the aid of a temperature sensor. The thermal post-combustion is used for two oven chambers, one of which operates in a pyrolysis or carbonisation mode and the other operates in the form of a combustion chamber.