RESTORATION OF METAL OXIDE CONTAINING MATERIAL BASED ON AMMONIA NH3

Claims

1. A method for reducing a material containing metal oxides (2) in which a reducing gas obtained using ammonia NH is supplied 3, wherein the reducing gas is fed into a reduction reactor (2) containing a material containing a metal oxide, and an exhaust gas is removed from the reduction reactor, characterized in that at least part of the exhaust gas, if necessary, after processing the exhaust gas, is used as a component in the preparation of the reducing gas.

2. The method according to claim 1, characterized in that the treatment of the exhaust gas removed from the recovery reactor (2) includes a method step for reducing the nitrogen content.

3. The method according to claim 1 or 2, characterized in that at least one member of the first group consisting of is added to the exhaust gas and / or process gas during the preparation of the reducing gas. ammonia, hydrogen obtained from ammonia.

4. The method according to any one of paragraphs 1-3, characterized in that at least one member of the second group consisting of is added to the exhaust gas and / or process gas during the preparation of the reducing gas natural gas, hydrocarbons, hydrogen, carbon monoxide, coke oven gas, syngas containing several components from the group of components consisting of CO, H2, CH4, C2-C6 hydrocarbons, N2, CO2.

5. The method according to claim 4, characterized in that after combining the exhaust gas or process gas and at least one member of the first group, at least one member of the second group is added to the resulting gas mixture.

6. The method according to claim 4, characterized in that after combining the exhaust gas or process gas and at least one member of the second group, at least one member of the first group is added to the resulting gas mixture.

7. The method according to any one of paragraphs 1-6, characterized in that it is carried out in a reduction reactor (2) with a cooling zone (12) and / or a product cooler, characterized in that ammonia is introduced into the cooling zone (12) of the recovery reactor (2) and / or into the product cooler.

8. A device (1) for reducing a material (3) containing metal oxides, comprising recovery reactor (2), an exhaust gas outlet (4) for removing exhaust gas from the recovery reactor (2), at least one ammonia supply line (7), a preparation unit (6) for preparing reducing gas, which includes at least one ammonia supply line (7), a supply line (8) for feeding reducing gas and / or reducing gas precursor into the reduction reactor (2), characterized in that The outlet (5) of the exhaust gas enters the preparation unit (6).

9. The device according to claim 8, characterized in that the outlet (5) of the exhaust gas contains at least one treatment unit, which is a device (9) for reducing the nitrogen content.

10. The device according to claim 8 or 9, characterized in that the preparation unit (6) includes at least one power line (10) for supplying one or more members of a group consisting of: natural gas, hydrocarbons, hydrogen, carbon monoxide, coke oven gas, syngas.

11. A device according to any one of paragraphs 8-10, in which the reduction reactor (2) has a cooling zone (12) and / or a product cooler, characterized in that the ammonia supply line (11) enters the cooling zone (12) and / or the product cooler.

12. A signal processing device with machine-readable program code, characterized in that it has control commands for performing the method according to any of paragraphs 1-7.

13. Machine-readable program code for a signal processing device, characterized in that the program code contains control commands that cause the signal processing device to perform the method according to any of paragraphs 1-7.

14. A storage medium with a machine-readable program code stored thereon according to paragraph 13.

15. A control and / or regulation system for a device for reducing a material containing metal oxides with a computer containing a computer software product that includes commands that, when executing the computer program, cause the computer to perform the steps of the method according to any of paragraphs 1-7.