Recovery of magnetite from FeSO_4·7H_2O waste slag by co-precipitation method with calcium hydroxide as precipitant  

作　　者：余旺 彭映林 郑雅杰 

机构地区：[1]School of Metallurgy and Environment,Central South University [2]School of Chemistry and Environmental Engineering,Hunan City University

出　　处：《Journal of Central South University》2017年第1期62-70,共9页中南大学学报（英文版）

基　　金：Project(2013A090100013)supported by the Special Project on the Integration of Industry,Education and Research of Guangdong Province,China;Project(201407300993)supported by the High-Tech Research and Development Program of Xinjiang Uygur Autonomous Region,China

摘　　要：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 Fe304 purity of 88.78%, but apt to aggregate with a median particle size of 1.83 μm. Magnetic measurement reveals the obtained Fe304 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.Proper utilization of the FeSO_4-7H_2O waste slag generated from TiO_2 industry is an urgent need,and Fe_3O_4 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 Fe_3O_4 purity of 88.78%,but apt to aggregate with a median particle size of 1.83 μm.Magnetic measurement reveals the obtained Fe_3O_4 particles are soft magnetic with a saturation magnetization of 81.73 A·m^2/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 Fe_3O_4 particles in water treatment field.

关 键 词：FeSO4·7H2O TiO2 industry MAGNETITE CO-PRECIPITATION calcium hydroxide magnetic seeding flocculation 

分 类 号：X70[环境科学与工程—环境工程]