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Synthesis of Fe3O4 Magnetic Powder from Spent Pickling Liquors

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Abstract

Spent pickling liquors pose a serious environmental problem in most industrialized countries, mainly owing to their corrosive properties and their ferrous iron and hydrochloric acid content. In this paper, spent pickling liquor was used as an inexpensive raw material to prepare Fe3O4 magnetic powder via an oxidation method. Being able to recover the dissolved iron from spent pickling liquors would not only salvage a valuable material but also render the effluent environmentally benign. The structure of the Fe3O4 magnetic powder was characterized by X-ray diffraction. The morphology and size were characterized by scanning electron microscopy and transmission electron microscopy. Their magnetic properties were tested at room temperature by a vibrating sample magnetometer. In addition, the saturation magnetization of Fe3O4 products can be further enhanced to 96.1 emu/g after purification.

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Acknowledgements

This work was supported by the project of Synthesis of Iron Oxide Red from Waste Acid (No. 2016GIF-0035).We wish to thank Mr. Lin Kui and Mr. Zhou Dingbang, Tianjin University, Tianjin, China, for their assistance in characterizing the Fe3O4 magnetic powder.

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  1. Department of Chemistry, School of Sciences, Tianjin University, Tianjin, 300354, China

    Xingyao Wang & Feifei Lv

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  1. Xingyao Wang
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  2. Feifei Lv
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Correspondence to Xingyao Wang.

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Wang, X., Lv, F. Synthesis of Fe3O4 Magnetic Powder from Spent Pickling Liquors. Trans. Tianjin Univ. 24, 45–50 (2018). https://doi.org/10.1007/s12209-017-0095-5

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  • DOI: https://doi.org/10.1007/s12209-017-0095-5

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