Preparation method for converting refractory low-grade hematite into super-high-grade metallized briquettes

By combining fluidized rotary kiln with continuous rail-mounted hot pressing technology, the problem of efficient utilization of difficult-to-process low-grade hematite has been solved, and high-quality metallized agglomerates have been prepared to meet the smelting requirements of high-purity steel, providing a new type of raw material for low-carbon short-process steelmaking.

CN122189263APending Publication Date: 2026-06-12UNIV OF SCI & TECH LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH LIAONING
Filing Date
2026-04-03
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing fluidized bed rotary kilns suffer from high reduction energy consumption, slow reduction reaction, and low metal recovery rate when processing difficult-to-process low-grade iron ore, making it difficult to achieve efficient utilization of difficult-to-process low-grade hematite.

⚗Method used

By combining fluidized rotary kiln with continuous rail hot pressing technology, and through low-temperature magnetized roasting with hydrogen-rich gas and reducing gas with jet device, efficient gas-solid contact of iron ore powder in suspension is achieved to prepare ultra-high grade metallized agglomerates.

🎯Benefits of technology

It significantly improves heat and mass transfer efficiency and reduction uniformity, increases metallization rate and iron recovery rate, and the prepared metallized agglomerates meet the smelting requirements of high-purity steel, providing a new type of raw material for low-carbon short-process steelmaking and reducing dependence on high-quality iron ore.

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Abstract

The present application relates to the technical field of short process low-carbon steelmaking raw material preparation, and particularly relates to a preparation method for converting low-grade hematite into super-high-grade metallized briquettes, which comprises the following steps: firstly, enriching iron concentrate powder through a rotary kiln low-temperature magnetization roasting-magnetic separation process, and then converting the iron concentrate powder into super-high-grade metallized briquettes through a fluidized rotary kiln hydrogen reduction process and a continuous rail hot pressing forming process. The present application has the beneficial effects that: the material realizes efficient gas-solid contact in a suspended state, greatly improves the heat transfer efficiency and reduction uniformity, realizes efficient utilization of low-grade hematite resources, and the prepared high-quality metallized briquettes meet the smelting requirements of high-purity steel, and provide a new raw material source for low-carbon short process steelmaking.
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