Method for strengthening the consolidation of ultrafine particle size iron concentrate pellets by using multi-source fly ash

By combining multi-source dust collector ash with ultrafine iron concentrate and binder, the oxidation kinetics inside the pellets are improved, generating low-melting-point liquid-phase bonding bridges. This solves the "double-layer structure" problem of ultrafine iron concentrate pellets, achieving high-strength consolidation and improved metallurgical performance.

CN122279201APending Publication Date: 2026-06-26CHONGQING UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Filing Date
2026-05-11
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

During the oxidative roasting process, ultrafine iron concentrate pellets are prone to forming a "double-layer structure", which leads to uneven oxidation inside the pellets, poor compressive strength and high-temperature metallurgical performance. Existing technologies have failed to effectively utilize the unique properties of metallurgical dust for functional control.

Method used

Multi-source dust collector ash is mixed with ultrafine iron concentrate and binder. Through pelletizing, drying, preheating, roasting and homogenization processes, the carbon content and calcareous flux characteristics of the dust collector ash are used to improve the oxidation kinetics of the pellets, generate low-melting-point liquid phase bonding bridges, and strengthen the intergranular bonding of hematite grains.

Benefits of technology

This method achieves high-strength consolidation of ultrafine iron concentrate pellets, improving the compressive strength and metallurgical properties of the pellets, and realizing the comprehensive recycling and high-value-added disposal of metallurgical solid waste.

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Abstract

This invention discloses a method for strengthening the consolidation of ultrafine iron concentrate pellets using multi-source dust collector ash, belonging to the metallurgical industry. The invention proposes adding multi-source dust collector ash and a binder to ultrafine iron concentrate in a specific ratio, mixing and pelletizing, and then obtaining the finished pellets through drying, preheating, roasting, and homogenization processes. This method utilizes the high free carbon content of gravity dust and ore bin dust, which, after roasting, improves the diffusion channels of the oxidizing atmosphere inside the pellets, thereby promoting the homogenization and consolidation of the entire pellet. It also incorporates high-calcium flux, such as sintering ash, to adjust the basicity of the pellets, promoting the formation of low-melting-point liquid phases in micro-regions, achieving a solid-liquid co-enhanced pellet consolidation behavior. This method can effectively improve the phenomenon of incomplete oxidation within ultrafine iron concentrate pellets, thereby increasing the overall compressive strength of the finished pellets, while simultaneously achieving high added value and comprehensive recycling of multi-source solid waste in the metallurgical industry.
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