Red mud-based composite calcium ferrite and preparation method and use thereof

US11773025B2 · kind B2 · utility

Assignee

• University of Science and Technology Beijing · CN

Inventors

• Yanling Zhang · Beijing, CN
• Zheng Zhao · Beijing, CN
• Weifeng Zhang · Nanhu, CN
• Kan Yu · Beijing, CN
• Yao Zhang · Beijing, CN

Key dates

• Filing date: Oct 13, 2022
• Grant date: Oct 3, 2023
• Expiry date: Nov 18, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Provided is a red mud-based composite calcium ferrite and a preparation method and use thereof. The preparation method of the red mud-based composite calcium ferrite includes the following steps: mixing red mud and a calcium source, and roasting an obtained mixture in an oxygen-containing atmosphere to obtain the red mud-based composite calcium ferrite; where the calcium source is selected from the group consisting of lime and calcium carbonate. In the present disclosure, the composite calcium ferrite is prepared using a solid waste red mud, with a greatly reduced cost of raw materials; on the other hand, compared with traditional calcium ferrite, the composite calcium ferrite mainly has phase structures of CaFe2O4, Ca2FeAlO5, and Ca2Fe2O5. Therefore, the composite calcium ferrite has a lower melting point, a higher lime dissolution efficiency, and better fluxing and dephosphorization effects during primary smelting and refining of molten steel, and has broad prospects for use in industry.