The effect of bulk iron concentration and heterogeneities on the copper activation of sphalerite
The effect of bulk iron concentration and heterogeneities on the copper activation of sphalerite
复制标题
DOI：
10.1016/j.mineng.2008.02.014
复制
发表时间：
2008-11
影响因子：
4.8
通讯作者：
S. Harmer;A. Mierczynska-Vasilev;D. Beattie;J. Shapter
中科院分区：
文献类型：
--
作者：
S. Harmer;A. Mierczynska-Vasilev;D. Beattie;J. Shapter
利用原子力显微镜（AFM）和X射线光电子能谱（XPS）研究了Fe含量为0 ~ 14.79wt%的闪锌矿（110）表面Cu的活化过程。时间分辨的AFM图像显示在高能量阶跃边缘的表面氧化产物的发展。随着时间的推移，这些小突起演变成更大的团块，最终完全覆盖表面。表面形态的变化表明，作为Fe浓度的函数的分裂步骤的数量和沉淀物的大小的增加。与低Fe闪锌矿相比，这两个因素都有助于高Fe闪锌矿的Cu活化速率增加。XPS分析的闪锌矿铜活化1小时，在pH值为5，表明增加的铜浓度和形成的二硫化物和多硫化物，与本体铁含量的增加。
Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were used to study the Cu activation of the (110) surface of sphalerites with Fe content varying from 0 to 14.79wt%. Time resolved AFM images show the development of surface oxidation products at high-energy step edges. These small protrusions evolve into larger conglomerates and finally full surface coverage with time. Surface morphology changes show an increase in the number of cleavage steps and the size of precipitates as a function of Fe concentration. Both of these factors contribute to the increased rate of Cu activation of high Fe sphalerite as compared to low Fe sphalerite. XPS analysis of the sphalerites Cu activated for 1h at pH 5, indicates an increased Cu concentration and the formation of disulphide and polysulphide that correlates with an increase in bulk Fe content.