Synthesis and properties of SrFe<sub>12</sub>O<sub>19</sub> obtained by solid waste recycling of oily cold rolling mill sludge

Bo Liu; Shen-gen Zhang; Britt-Marie Steenari; Christian Ekberg

doi:10.1007/s12613-019-1772-2

Volume 26 Issue 5

May 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(5): 642-648

Bo Liu, Shen-gen Zhang, Britt-Marie Steenari, and Christian Ekberg, Synthesis and properties of SrFe₁₂O₁₉ obtained by solid waste recycling of oily cold rolling mill sludge, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 642-648. https://doi.org/10.1007/s12613-019-1772-2

Cite this article as:

Bo Liu, Shen-gen Zhang, Britt-Marie Steenari, and Christian Ekberg, Synthesis and properties of SrFe12O19 obtained by solid waste recycling of oily cold rolling mill sludge, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 642-648. https://doi.org/10.1007/s12613-019-1772-2

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Research Article

Synthesis and properties of SrFe₁₂O₁₉ obtained by solid waste recycling of oily cold rolling mill sludge

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Corresponding author:
Shen-gen Zhang E-mail: zhangshengen@mater.ustb.edu.cn
Received: 14 November 2018; Revised: 24 February 2019; Accepted: 27 February 2019

Abstract

Abstract

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·m²·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 Fe³⁺ and Sr²⁺ was 1.5. This study presents a new approach to utilizing oily CRM sludge, and even refractory iron-containing solid waste.
- strontium ferrite;
- oily cold rolling mill sludge;
- magnetic properties;
- citrate precursor method;
- recycling

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