Patent ID: 8419825

Claim:
A process for producing liquid pig iron or liquid primary steel products and sponge iron from charge materials that are formed from iron ore, comprising: reducing the charge materials directly into sponge iron in a first reduction zone, smelting the sponge iron is in a melter gasifier while carbon carriers and gas containing oxygen are fed in, whereby a generator gas containing CO and H 2 is produced; discharging the generator gas from the melter gasifier; first cooling and then dedusting the generator gas produced in the melter gasifier for producing a reducing gas; introducing a first partial amount of the reducing gas obtained in the dedusting as a first reducing gas into the first reduction zone, where the first partial amount of the reducing gas is converted to and drawn off as top gas; subsequently dust scrubbing the top gas and after the dust scrubbing of the top gas, partly or completely subjecting the top gas to compression and CO 2 scrubbing; after the CO 2 scrubbing of the top gas, admixing at least a first partial amount of the CO 2 -scrubbed gas with the generator gas that leaves the melter gasifier, wherein the generator gas is cooled; obtaining a second partial amount of the reducing gas in the dedusting and admixing the second partial amount of the reducing gas with a second partial amount of the CO 2 -scrubbed gas, after being heated, for producing a second reducing gas; feeding the second reducing gas to at least one further reduction zone for direct reduction of further iron ore, wherein the second partial amount of the reducing gas recovered in the dedusting makes up between 5% by volume and 50% by volume, of the overall amount of the reducing gas obtained in the dedusting.