View in EDS

From hazardous red mud to hard magnetic ferrite material: A comparative study between Ba and Sr ferrites.

Saved in:
Bibliographic Details
Title: From hazardous red mud to hard magnetic ferrite material: A comparative study between Ba and Sr ferrites.
Authors: Peng, Long1,2 (AUTHOR), Yang, Peidong1,2 (AUTHOR), Liu, Bingbing1,2,3 (AUTHOR) liubingbing@zzu.edu.cn, Su, Shengpeng1,2,3 (AUTHOR), Sun, Hu1,2,3 (AUTHOR), Huang, Yanfang1,2,3 (AUTHOR), Han, Guihong1,2,3 (AUTHOR) hanguihong@zzu.edu.cn
Source: Ceramics International. May2026:Part B, Vol. 52 Issue 13, p22677-22689. 13p.
Subjects: Strontium ferrite, Barium ferrite, Magnetic properties, Electromagnetic wave absorption, Mud, Microstructure, Phase transitions
Abstract: Converting red mud directly into high-value-added functional materials is a disposal approach that combines technical feasibility and potential for efficient utilization of resources. Given its iron-rich nature, red mud serves as a viable precursor for the synthesis of functional ferrites. In this study, high-temperature oxidation sintering transforms the complex mineral phases present in red mud into hard magnetic Sr/Ba ferrites and non-magnetic silicates. The phase transformation, microstructural evolution, reaction interface characteristics, magnetic properties, and electromagnetic wave absorption performance of the resulting materials were systematically investigated. Both ferrite samples exhibited strong ferromagnetic behavior: SrFe 12 O 19 achieved a saturation magnetization of 28.6 emu·g−1, while BaFe 12 O 19 reached 31.6 emu·g−1, with corresponding coercivities of 3650.2 Oe and 2898.1 Oe, respectively. They also have effective electromagnetic wave absorption over a wide frequency range, and both reach the RL values of −49 dB and −52.1 dB at a thickness of 11 mm, respectively. The formation mechanisms and properties between Ba ferrite and Sr ferrite are compared, and the comparisons between hard and soft magnetic ferrites from red mud are also highlighted. Eventually, it's demonstrated that both ferrites exhibit efficient comprehensive properties, providing a promising approach for the large-scale and high-value utilization of red mud. [Display omitted] • Two kinds of hard magnetic materials are prepared from red mud. • The magnetism and wave absorption performance of ferrites are characterized. • The chemical fundamentals for the formation of Ba/Sr ferrites are established. • The formation mechanism and properties between Ba ferrite and Sr ferrite are compared. • The comparisons between hard and soft magnetic ferrites from red mud are highlighted. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Converting red mud directly into high-value-added functional materials is a disposal approach that combines technical feasibility and potential for efficient utilization of resources. Given its iron-rich nature, red mud serves as a viable precursor for the synthesis of functional ferrites. In this study, high-temperature oxidation sintering transforms the complex mineral phases present in red mud into hard magnetic Sr/Ba ferrites and non-magnetic silicates. The phase transformation, microstructural evolution, reaction interface characteristics, magnetic properties, and electromagnetic wave absorption performance of the resulting materials were systematically investigated. Both ferrite samples exhibited strong ferromagnetic behavior: SrFe 12 O 19 achieved a saturation magnetization of 28.6 emu·g−1, while BaFe 12 O 19 reached 31.6 emu·g−1, with corresponding coercivities of 3650.2 Oe and 2898.1 Oe, respectively. They also have effective electromagnetic wave absorption over a wide frequency range, and both reach the RL values of −49 dB and −52.1 dB at a thickness of 11 mm, respectively. The formation mechanisms and properties between Ba ferrite and Sr ferrite are compared, and the comparisons between hard and soft magnetic ferrites from red mud are also highlighted. Eventually, it's demonstrated that both ferrites exhibit efficient comprehensive properties, providing a promising approach for the large-scale and high-value utilization of red mud. [Display omitted] • Two kinds of hard magnetic materials are prepared from red mud. • The magnetism and wave absorption performance of ferrites are characterized. • The chemical fundamentals for the formation of Ba/Sr ferrites are established. • The formation mechanism and properties between Ba ferrite and Sr ferrite are compared. • The comparisons between hard and soft magnetic ferrites from red mud are highlighted. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.03.328