Recovery of magnetite from FeSO₄·7H₂O waste slag by co-precipitation method with calcium hydroxide as precipitant

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• 作者：Wang Yu 余旺 ; Ying-lin Peng 彭映林 ; Ya-jie Zheng 郑雅杰
• 关键词：Key wordsFeSO4·7H2O ; TiO2 industry ; magnetite ; co ; precipitation ; calcium hydroxide ; magnetic seeding flocculation
• 刊名：Journal of Central South University
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：62-70
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：24

文摘

Proper utilization of the FeSO₄·7H₂O waste slag generated from TiO₂ industry is an urgent need, and Fe₃O₄ particles are currently being widely used in the wastewater flocculation field. In this work, magnetite was recovered from ferrous sulphate by a novel co-precipitation method with calcium hydroxide as the precipitant. Under optimum conditions, the obtained spherical magnetite particles are well crystallized with a Fe₃O₄ purity of 88.78%, but apt to aggregate with a median particle size of 1.83 μm. Magnetic measurement reveals the obtained Fe₃O₄ particles are soft magnetic with a saturation magnetization of 81.73 A·m2/kg. In addition, a highly crystallized gypsum co-product is obtained in blocky or irregular shape. Predictably, this study would provide additional opportunities for future application of low-cost Fe₃O₄ particles in water treatment field.