US 2025/0154615 A1 · METHOD FOR THE PRODUCTION OF SPONGE IRON FROM IRON ORE

Abstract

The present invention relates to a method for the production of sponge iron from iron ore, comprising the steps of: charging iron ore into a direct reduction shaft (1); introducing a hydrogen-rich process gas into the direct reduction shaft (1) in order to reduce the iron ore and produce sponge iron; wherein the step of introducing the hydrogen-rich process gas comprises the steps of: conducting a reduction gas comprising at least 80 vol. % hydrogen gas through a first gas line (5) from a hydrogen gas source (4, 21) to the reduction shaft (1), and heating the reduction gas in said first gas line (5) to a first temperature T1. The method further comprises the steps of adding carbon dioxide gas to the reduction gas, upstream or downstream a point along the first gas line (5) at which the reduction gas is heated, and adding oxygen gas to the heated reduction gas to form said hydrogen-rich process gas, and introducing the hydrogen-rich process gas is into the shaft (1).

Claims17

Dependent claims

A method for the production of sponge iron from iron ore, comprising the steps of:

charging iron ore into a direct reduction shaft (1);
introducing a hydrogen-rich process gas into the direct reduction shaft (1) in order to reduce the iron ore and produce sponge iron;
wherein the step of introducing the hydrogen-rich process gas comprises the steps of:
conducting a reduction gas comprising at least 80 vol. % hydrogen gas through a first gas line (5) from a hydrogen gas source (4) to the reduction shaft (1), and
heating the reduction gas in said first gas line (5) to a first temperature T1, said method being characterized in that it comprises the steps of
adding carbon dioxide gas to the reduction gas, upstream or downstream a point along the first gas line (5) at which the reduction gas is heated, and adding oxygen gas to the heated reduction gas to form said hydrogen-rich process gas, and
introducing the hydrogen-rich process gas into the shaft (1).

4 more elements

An arrangement for producing sponge iron, comprising:

a direct reduction shaft (1) having an inlet (2) for the introduction of iron ore and an outlet (3) for the removal of produced sponge iron out of the direct reduction shaft (1),
a hydrogen gas source (4),
a first gas line (5) extending from the hydrogen gas source (4) to the reduction shaft (1),
a carbon dioxide gas source (6),
an oxygen gas source (7), and
a heater (16) arranged in the first gas line (5), for heating a gas flowing in the first gas line (5), the arrangement being characterized in that it comprises
a second gas line (8) which extends from the carbon dioxide gas source (6) to the first gas line (5) and which is configured to enable addition of carbon dioxide gas from the carbon dioxide gas source (6) to a reduction gas flowing in the first gas line (5) from the hydrogen gas source (4) towards the direct reduction shaft (1), and
a third gas line (9) which extends from the oxygen gas source (7) and is connected to the first gas line (5) downstream the heater (16) and which is configured to enable addition of oxygen gas from the oxygen gas source (6) to a reduction gas flowing in the first gas line (5) from the hydrogen gas source (4) towards the direct reduction shaft (1).

5 more elements

Dependencies are inferred from the claim text.

Method for the production of sponge iron from iron ore

Life of this patent

Method for the production of sponge iron from iron ore

Life of this patent

Abstract

Claims17