A method for processing metal ore comprising the following steps: reducing a metal ore in a blast furnace shaft; producing furnace gas containing CO 2 in the blast furnace shaft; discharging the furnace gas from the blast furnace shaft; directing the furnace gas directly or indirectly into a CO 2 -converter and converting the CO 2 contained in the furnace gas into an aerosol consisting of a carrier gas and C-particles in the CO 2 -converter in the presence of a stoichiometric surplus of C; directing a first portion of the aerosol from the CO 2 -converter into the blast furnace shaft; wherein a second portion of the aerosol from the CO 2 -converter is fed to a further processing process; or wherein the second portion of the aerosol from the CO 2 -converter is first burned to form a CO 2 -containing exhaust gas mixture before it is passed on as this exhaust gas mixture to a further processing process; introducing water vapour H 2 O into the blast furnace shaft, wherein the introduction of the aerosol and the introduction of the water vapour into the blast furnace shaft is effected via separate nozzles; and wherein the further processing process is one of the following, - an oxidation process in a fuel cell or a combustion process in a gas engine or a gas turbine; - a biological conversion process in a bio converter and is carried out using microbes or algae according to one or more of the following net equations: a) 6 CO + 3 H 2 O → C 2 H 5 OH + 4 CO 2; b) 6 H 2 + 2 CO 2 → C 2 H 5 OH + 3 H 2 O; c) 2 CO + 4 H 2 → C 2 H 5 OH + H 2 O; and - a conversion process in which synthesis gas is converted into a functionalised and/or non-functionalised hydrocarbon. reducing a metal ore in a blast furnace shaft; producing furnace gas containing CO 2 in the blast furnace shaft; discharging the furnace gas from the blast furnace shaft; directing the furnace gas directly or indirectly into a CO 2 -converter and converting the CO 2 contained in the furnace gas into an aerosol consisting of a carrier gas and C-particles in the CO 2 -converter in the presence of a stoichiometric surplus of C; directing a first portion of the aerosol from the CO 2 -converter into the blast furnace shaft; wherein a second portion of the aerosol from the CO 2 -converter is fed to a further processing process; or wherein the second portion of the aerosol from the CO 2 -converter is first burned to form a CO 2 -containing exhaust gas mixture before it is passed on as this exhaust gas mixture to a further processing process; introducing water vapour H 2 O into the blast furnace shaft, wherein the introduction of the aerosol and the introduction of the water vapour into the blast furnace shaft is effected via separate nozzles; and wherein the further processing process is one of the following, - an oxidation process in a fuel cell or a combustion process in a gas engine or a gas turbine; - a biological conversion process in a bio converter and is carried out using microbes or algae according to one or more of the following net equations: a) 6 CO + 3 H 2 O → C 2 H 5 OH + 4 CO 2; b) 6 H 2 + 2 CO 2 → C 2 H 5 OH + 3 H 2 O; c) 2 CO + 4 H 2 → C 2 H 5 OH + H 2 O; and - a conversion process in which synthesis gas is converted into a functionalised and/or non-functionalised hydrocarbon. - an oxidation process in a fuel cell or a combustion process in a gas engine or a gas turbine; - a biological conversion process in a bio converter and is carried out using microbes or algae according to one or more of the following net equations: a) 6 CO + 3 H 2 O → C 2 H 5 OH + 4 CO 2; b) 6 H 2 + 2 CO 2 → C 2 H 5 OH + 3 H 2 O; c) 2 CO + 4 H 2 → C 2 H 5 OH + H 2 O; and a) 6 CO + 3 H 2 O → C 2 H 5 OH + 4 CO 2; b) 6 H 2 + 2 CO 2 → C 2 H 5 OH + 3 H 2 O; c) 2 CO + 4 H 2 → C 2 H 5 OH + H 2 O; and - a conversion process in which synthesis gas is converted into a functionalised and/or non-functionalised hydrocarbon.