Novel coprecipitation–oxidation method for recovering iron from steel waste pickling liquor

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• 作者：Shejiang Liu ; Hongyang Yang ; Yongkui Yang…
• 关键词：Waste pickling liquor ; Coprecipitation–oxidation ; Fe3O4 nanoparticles ; Oxidation–reduction potential ; Promoter
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：11
• 期：1
• 全文大小：
• 刊物主题：Environment, general;
• 出版者：Higher Education Press
• ISSN：2095-221X
• 卷排序：11

文摘

Waste pickling liquors (WPLs) containing high concentrations of iron and acid are hazardous waste products from the steel pickling processes. A novel combined coprecipitation–oxidation method for iron recovery by Fe₃O₄ nanoparticle production from the WPLs was developed in this study. An oxidation–reduction potential monitoring method was developed for real-time control of the Fe2+/Fe3+ molar ratio. The key coprecipitation–oxidation parameters were determined using the orthogonal experimental design method. The use of promoters greatly improved the Fe₃O₄ nanoparticle crystallinity, size, magnetization, and dispersion. X-ray diffraction patterns showed that the produced Fe₃O₄ nanoparticles were single phase. The Fe₃O₄ nanoparticles were approximately spherical and slightly agglomerated. Vibrating sample magnetometry showed that the Fe₃O₄ nanoparticles produced from the WPLs had good magnetic properties, with a saturation magnetization of 80.206 emu·g–1 and a remanence of 10.500 emu·g–1. The results show that this novel coprecipitation–oxidation method has great potential for recycling iron in WPLs.