高铁锌焙砂在高梯度磁场中的元素分布行为(英文)

Element distribution of high iron-bearing zinc calcine in high gradient magnetic field

采用高梯度磁选将难溶铁酸锌从锌焙砂中分离,并利用ICP、XRD、穆斯堡尔、SEM及激光粒度仪分析锌焙砂中的元素组成及物相结构。考察磁感应强度对铁酸锌及杂质元素如钙、硫和铅在磁选过程中的分布行为的影响。结果表明,85%以上的铁酸锌在0.70T的磁感应强度下能分布到精矿中,60%的钙和 40%的硫主要分布在非磁性物相中,并在磁选过程中富集于尾矿中,大部分的铅以超细颗粒均匀分散在锌焙砂中。

High gradient magnetic separation was conducted in order to separate insoluble zinc ferrite from zinc calcine before acid leaching of hydrometallurgical process. Chemical composition and structural characterization of zinc calcine were studied via inductively coupled plasma （ICP）, X-ray diffraction （XRD）, Mossbauer spectra, scanning electron microscopy （SEM） and laser particle analysis （LPA）. The parameters of magnetic separation which affect the distribution of zinc ferrite and undesired elements, such as calcium, sulfur and lead in magnetic concentrate were investigated. The results of high gradient magnetic separation indicate that more than 85% of zinc ferrite is distributed into magnetic concentrate from the zinc calcine under the magnetic induction of 0.70 T. In addition, about 60% of calcium and 40% of sulfur distribute in non magnetic phases of tailings during magnetic separation process. Most of lead distributes uniformly along the zinc calcine in superfine particle size.