ժҪ High pressure roll grinding (HPRG) and ball milling were compared to investigate the influence of mechanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate, which was manufactured through magnetizing roasting-magnetic separation of high-phosphorus oolitic iron ores. The results indicated that when high-phosphorus iron ore concentrates containing 54��92 mass% iron and 0��76 mass% phosphorus were directly processed through acid leaching, iron ore concentrates containing 55��74 mass% iron and 0��33 mass% phosphorus with an iron recovery of 84��64% and dephosphorization of 63��79% were obtained. When high-phosphorus iron ore concentrates activated by ball milling were processed by acid leaching, iron ore concentrates containing 56��03 mass% iron and 0��21 mass% phosphorus with an iron recovery of 85��65% and dephosphorization of 77��49% were obtained. Meanwhile, when high-phosphorus iron ore concentrates activated by HPRG were processed by acid leaching, iron ore concentrates containing 58��02 mass% iron and 0��10 mass% phosphorus were obtained, with the iron recovery reaching 88��42% and the dephosphorization rate reaching 88��99%. Mechanistic studies demonstrated that ball milling can reduce the particle size, demonstrating a prominent reunion phenomenon. In contrast, HPRG pretreatment contributes to the formation of more cracks within the particles and selective dissociation of iron and P bearing minerals, which can provide the favorable kinetic conditions to accelerate the solid-liquid reaction rate. As such, the crystal structure is destroyed and the surface energy of mineral particles is strengthened by mechanical activation, further strengthening the dephosphorization.
Abstract��High pressure roll grinding (HPRG) and ball milling were compared to investigate the influence of mechanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate, which was manufactured through magnetizing roasting-magnetic separation of high-phosphorus oolitic iron ores. The results indicated that when high-phosphorus iron ore concentrates containing 54��92 mass% iron and 0��76 mass% phosphorus were directly processed through acid leaching, iron ore concentrates containing 55��74 mass% iron and 0��33 mass% phosphorus with an iron recovery of 84��64% and dephosphorization of 63��79% were obtained. When high-phosphorus iron ore concentrates activated by ball milling were processed by acid leaching, iron ore concentrates containing 56��03 mass% iron and 0��21 mass% phosphorus with an iron recovery of 85��65% and dephosphorization of 77��49% were obtained. Meanwhile, when high-phosphorus iron ore concentrates activated by HPRG were processed by acid leaching, iron ore concentrates containing 58��02 mass% iron and 0��10 mass% phosphorus were obtained, with the iron recovery reaching 88��42% and the dephosphorization rate reaching 88��99%. Mechanistic studies demonstrated that ball milling can reduce the particle size, demonstrating a prominent reunion phenomenon. In contrast, HPRG pretreatment contributes to the formation of more cracks within the particles and selective dissociation of iron and P bearing minerals, which can provide the favorable kinetic conditions to accelerate the solid-liquid reaction rate. As such, the crystal structure is destroyed and the surface energy of mineral particles is strengthened by mechanical activation, further strengthening the dephosphorization.
De-qing ZHU,Hao WANG,Jian PAN,Cong-cong YANG. Influence of Mechanical Activation on Acid Leaching Dephosphorization of High-phosphorus Iron Ore Concentrates[J]. �й������ڿ���, 2016, 23(7): 661-668.
De-qing ZHU,Hao WANG,Jian PAN,Cong-cong YANG. Influence of Mechanical Activation on Acid Leaching Dephosphorization of High-phosphorus Iron Ore Concentrates. Chinese Journal of Iron and Steel, 2016, 23(7): 661-668.
2016, Vol. 23 
