Synthesis and properties of SrFe12O19 obtained by solid waste recycling of oily cold rolling mill sludge
Journal article, 2019

The aim of this study was to develop a new approach for the preparation of environmentally friendly, high-value products from oily cold rolling mill (CRM) sludge. Utilizing oily CRM sludge as a source of iron, strontium hexaferrite (SrFe12O19) powders were prepared by multi-step processes involving acid leaching, chemical conversion treatment, and synthesis by a citrate precursor. The influences of citric acid dosage and the pH of the sol system on the formation, crystallite size, and magnetic properties of the obtained SrFe12O19 powders were investigated. High saturation magnetization (74.8 mA-m(2)g(-1)) and intrinsic coercivities (614.46 mT) were achieved for pH 7.0 of the sol system, for which the molar ratio of citric acid dosage to the total dosage of Fe-3+ and Sr2+ was 1.5. This study presents a new approach to utilizing oily CRM sludge, and even refractory iron-containing solid waste.

magnetic properties

citrate precursor method

recycling

strontium ferrite

oily cold rolling mill sludge

Author

Bo Liu

Beijing University of Technology

Shen-gen Zhang

Beijing University of Technology

Britt-Marie Steenari

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Christian Ekberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

International Journal of Minerals, Metallurgy and Materials

1674-4799 (ISSN)

Vol. 26 5 642-648

Subject Categories

Inorganic Chemistry

Polymer Technologies

Materials Chemistry

DOI

10.1007/s12613-019-1772-2

More information

Latest update

8/14/2019