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 r...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.展开更多
基金Project(2013A090100013)supported by the Special Project on the Integration of Industry,Education and Research of Guangdong Province,ChinaProject(201407300993)supported by the High Technology Research and Development Program of Xinjiang Uygur Autonomous Region,China
基金Project(2013A090100013)supported by the Special Project on the Integration of Industry,Education and Research of Guangdong Province,ChinaProject(201407300993)supported by the High-Tech Research and Development Program of Xinjiang Uygur Autonomous Region,China
文摘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.