Synthesis and properties of SrFe12O19 obtained by solid waste recycling of oily cold rolling mill sludge
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第5期
论文作者：Bo Liu Shen-gen Zhang Britt-Marie Steenari Christian Ekberg
文章页码：642 - 648
摘 要：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.
Bo Liu1，Shen-gen Zhang1，Britt-Marie Steenari2，Christian Ekberg2
1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing2. Nuclear Chemistry and Industrial Material Recycling, Department of Chemistry and Chemical Engineering, Chalmers University of Technology
摘 要：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.
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