磁性硫酸烧渣结构和物性特征及应用潜力  

The characteristics of structure and properties of magnetic pyrite cinder and its potential

作　　者：李平[1,2] 陈天虎[1,2] 朱晓[1,2] 史亚丹[1,2] 谢巧勤[1,2] 谢晶晶[1,2] 

机构地区：[1]合肥工业大学纳米矿物与环境材料实验室,安徽合肥230009 [2]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《地学前缘》2014年第5期346-351,共6页Earth Science Frontiers

基　　金：国家自然科学基金项目(41072035;41072036;41372045;41102023)

摘　　要：通过X射线荧光光谱、X射线粉末衍射分别对某公司磁性硫酸烧渣的化学和物相组成进行了鉴别,采用场发射扫描电镜观察微形貌和微结构特征,测定了烧渣的磁化率和磁滞回线。结果表明,硫精矿粉沸腾炉焙烧所得磁性硫酸烧渣,铁品位达到64.78%,杂质组分主要是硅、铝和硫;主要物相为磁铁矿、磁赤铁矿和赤铁矿,含少量石英;比表面积为2.83m2/g,磁化率为18 000×10-8 m3/kg;原始微米粒径的黄铁矿粉体在脱硫、氧化相变为磁赤铁矿、磁铁矿和赤铁矿的过程中多晶化、纳米化,转变为纳米-亚微米晶体,颗粒表现为多孔特征。这种较高比表面积、强磁性的磁性烧渣有望在吸附和磁分离领域作为功能材料发挥作用。研究结果也为利用铁硫化物热分解相变进行矿物纳米材料加工提供了新的思路。In this study, chemical components, phase ingredient, morphology and susceptibility of magnetic pyrite cinder obtained from a company were characterized by using XRF （X-ray fluorescence）, XRD （X ray diffraction）, FE-SEM （field emission scanning electron microscope） and magnetic susceptibility analysis, respectively. The results showed that the iron level reached to 64. 78% and the impurity were mainly composed of Si, Al and S; the phase ingredients mainly consist of magnetite, maghemite, hematite and a trace amount of quartz; its magnetic susceptibility was up to 18000 × 10 -8 m3/kg; and its specific surface area was up to 2. 83 m2/g when magnetic pyrite cinder was heat-treated in lean oxygen atmosphere. Furthermore, the newly formed pyrite cinder was a kind of aggregation of polycrystals with the size of nano-micro scale and with porous characteristics. The high specific surface area and strong magnetic pyrite cinder formed by this treatment could be used as a material in the fields of adsorption and magnetic separation. The results also provide a new way to induce the phase transformation of pyrite to produce nano mineral materials by thermal decomposition.

关 键 词：硫酸烧渣 形貌 结构 磁性 环境材料 

分 类 号：P574.1[天文地球—矿物学]