A method for sequestering carbon dioxide from a top gas fuel, comprising: given a top gas obtained from a reduction furnace, wet scrubbed, and divided into a process gas and a top gas fuel: mixing the process gas with a hydrocarbon and feeding a resulting reformer feed gas into a carbon dioxide and steam reformer for reforming the reformer feed gas and forming a reducing gas that is fed back to the reduction furnace; and feeding at least a portion of the top gas fuel into a carbon dioxide scrubber for removing at least some carbon dioxide from the top gas fuel and forming a carbon dioxide lean gas that becomes, after the addition of a hydrocarbon, a reformer fuel gas which is fed into the carbon dioxide and steam reformer, while a portion of the carbon dioxide lean gas is possibly mixed with the reducing gas; wherein a ratio of the process gas to the top gas fuel is defined by the available heat in the carbon dioxide and steam reformer to which the reformer feed gas is fed; that is wherein the ratio of the process gas to the top gas fuel is 1:1 when the carbon dioxide lean gas is utilized for mixing with the reducing gas and is 2:1 when the carbon dioxide lean gas is not utilized for mixing with the reducing gas. given a top gas obtained from a reduction furnace, wet scrubbed, and divided into a process gas and a top gas fuel: mixing the process gas with a hydrocarbon and feeding a resulting reformer feed gas into a carbon dioxide and steam reformer for reforming the reformer feed gas and forming a reducing gas that is fed back to the reduction furnace; and feeding at least a portion of the top gas fuel into a carbon dioxide scrubber for removing at least some carbon dioxide from the top gas fuel and forming a carbon dioxide lean gas that becomes, after the addition of a hydrocarbon, a reformer fuel gas which is fed into the carbon dioxide and steam reformer, while a portion of the carbon dioxide lean gas is possibly mixed with the reducing gas; wherein a ratio of the process gas to the top gas fuel is defined by the available heat in the carbon dioxide and steam reformer to which the reformer feed gas is fed; that is wherein the ratio of the process gas to the top gas fuel is 1:1 when the carbon dioxide lean gas is utilized for mixing with the reducing gas and is 2:1 when the carbon dioxide lean gas is not utilized for mixing with the reducing gas. mixing the process gas with a hydrocarbon and feeding a resulting reformer feed gas into a carbon dioxide and steam reformer for reforming the reformer feed gas and forming a reducing gas that is fed back to the reduction furnace; and feeding at least a portion of the top gas fuel into a carbon dioxide scrubber for removing at least some carbon dioxide from the top gas fuel and forming a carbon dioxide lean gas that becomes, after the addition of a hydrocarbon, a reformer fuel gas which is fed into the carbon dioxide and steam reformer, while a portion of the carbon dioxide lean gas is possibly mixed with the reducing gas; wherein a ratio of the process gas to the top gas fuel is defined by the available heat in the carbon dioxide and steam reformer to which the reformer feed gas is fed; that is wherein the ratio of the process gas to the top gas fuel is 1:1 when the carbon dioxide lean gas is utilized for mixing with the reducing gas and is 2:1 when the carbon dioxide lean gas is not utilized for mixing with the reducing gas.