高铁赤泥悬浮磁化焙烧-弱磁选提铁工艺

高铁赤泥中的铁含量较多,是一种潜在的铁矿资源.因此,研发创新性工艺和技术以实现赤泥中铁的回收利用和赤泥减量很有必要.针对拜耳法高铁赤泥,制定了悬浮磁化焙烧-弱磁选的工艺流程,并研究了焙烧温度、焙烧时间、还原气CO浓度和总气量对磁化焙烧效果的影响.结果表明,在最佳焙烧条件下,焙烧矿经过弱磁选别,可获得磁选精矿TFe品位为...     

磁铁矿与赤铁矿混合浮选交互影响规律

研究了浮选药剂对单矿物浮选的影响、磁铁矿对赤铁矿浮选的影响。单矿物浮选研究表明,pH〉10时,NaOH的用量的对石英矿的浮选影响大于磁铁矿、赤铁矿的浮选。随着淀粉用量的增加磁铁矿和赤铁矿的回收率逐渐增加,当淀粉用量为10mg／L时,赤铁矿的浮选几乎受到完全的抑制。CaO对磁铁矿、赤铁矿的浮选几乎没有影响,然而对石英的浮选确有很大的影响,石英的回收率随着CaO用量的增加逐渐降低。磁铁矿、赤铁矿以及石英的回收率随着捕收剂用量的增加逐渐降低。人工混合矿浮选研究表明,赤铁矿浮选品位随着磁铁矿含量的增加逐渐增加。     

Hematite/Polystyrene Raspberry-Like Microcomposites as Stable Support for Silver Nanoparticle Immobilization

Among the methods utilized for the preparation of raspberry-like microcomposites, due to its simplicity and universality, the electrostatically-driven deposition of nanoparticles at the surface of microparticles is especially attractive. This process, leading to the formation of a single nanoparticle monolayer, is widely reported. On the other hand, no data concerning the electrostatically-driven formation of nanoparticle bilayers at the surface of microparticles are reported. To fill this gap, the detailed investigation of the formation of silver/hematite nanoparticle bilayers at the surface of polystyrene microparticles is reported. First, the hematite/polystyrene raspberry-like microcomposites are obtained by immobilization of hematite nanoparticles under an electrostatically-driven process. The stability of hematite/polystyrene microcomposites at elevated temperatures up to 323 K is monitored using microelectrophoresis. No significant changes in the hematite nanoparticle layer coverage are observed after prolonged time of incubation. This proves the irreversible character of nanoparticle immobilization. Next, the hematite/polystyrene microcomposites are utilized as the interfaces for immobilization of negatively charged silver nanoparticles. This process is quantitatively described using electrokinetic measurements. The changes in the hydrodynamic diameter of microcomposites are also determined. Finally, the validity of the electrokinetic model used in this work for predicting the zeta potential of the silver/hematite/polystyrene microcomposites is confirmed.