Method for producing direct reduced iron for steel plants

JP2024531660A5Active Publication Date: 2025-04-14LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
JP2024515575
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2021-09-13
Filing Date
2022-05-06
Publication Date
2025-04-14
Estimated Expiration
2042-05-06

AI Technical Summary

Technical Problem

The geographic spread of industrial-scale direct reduction iron (DRI) processes, especially those with a low carbon footprint, is limited by the challenges of achieving high productivity and requiring significant space and capital costs in batch-based processes, making them less commercially viable.

Method used

A continuous direct reduction process using ammonia as a reducing gas source, where iron ore is reduced in a direct reduction unit with separate zones for ore reduction and iron recovery, allowing ammonia decomposition to produce nitrogen and hydrogen, which are then used as reducing agents, while nitrogen acts as a thermal ballast and does not chemically mediate the reduction.

Benefits of technology

This process enhances the geographic applicability of DRI production by leveraging ammonia's ease of storage and transport, reduces emissions, and achieves efficient, low-carbon direct reduction with controlled carbon content in DRI, suitable for wider industrial deployment.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 00000000_0000_ABST
    Figure 00000000_0000_ABST
Patent Text Reader

Abstract

1. A process for the continuous direct reduction of iron ore (2) in a direct reduction unit (1) comprising a direct ore reduction zone (4a) and an iron recovery zone (4b), wherein ammonia (19) is fed to the iron recovery zone (4b), the ammonia (19) is decomposed into nitrogen and hydrogen, the nitrogen and hydrogen are transferred from the iron recovery zone (4b) to the direct ore reduction zone (4a), and the iron ore (2) is reduced with one or more reducing agents comprising said hydrogen.
Need to check novelty before this filing date? Find Prior Art