Effects of grinding media on the flotation performance of cassiterite
Effects of grinding media on the flotation performance of cassiterite
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磨矿介质对锡石浮选性能的影响
DOI：
10.1016/j.mineng.2021.106919
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发表时间：
2021-07
影响因子：
4.8
通讯作者：
Shengdong Zhang
中科院分区：
文献类型：
--
作者：
Yang Cao;Xiong Tong;Xian Xie;Qiang Song;Wenjie Zhang;Yunpeng Du;Shengdong Zhang
研磨在结晶过程中起着重要的作用。不同的研磨介质可以决定所生产材料的粒度分布、形状甚至表面特性。然而，磨矿介质对钙镁石浮选性能影响的综合研究还很缺乏。采用微浮选、激光粒度分析、电感耦合等离子体发射光谱（ICP-OES）、化学元素分析、Zeta电位测定、场发射扫描电镜-能谱分析等方法，研究了陶瓷和不锈钢介质对磨矿产物可浮性的影响（FESEM-EDS）和X射线光电子能谱（XPS）。微浮选试验结果表明，不锈钢粉的可浮性优于陶瓷粉。激光粒度分布测试表明，两种研磨介质对粒度分布没有强烈的影响。ICP-OES和化学元素分析结果表明，不锈钢研磨钙钛矿样品和矿浆中的铁含量较高是主要影响因素。Zeta电位分析表明，溶解态铁离子吸附在钙霞石表面导致矿物表面电位正移。这不仅降低了静电排斥，而且增加了水杨基异羟肟酸（SHA）化学吸附的活性位点。FESEM-EDS结果表明，与陶瓷研磨的钙长石相比，不锈钢研磨的钙长石的表面更粗糙，铁含量更高，从而增加了SHA吸附。通过XPS分析，观察到不锈钢研磨水滑石改变了水滑石表面上Fe物种的化学环境，其中与Fe 3+相比，Fe 2+对SHA表现出更强的反应性和稳定性。因此，与陶瓷等效物相比，不锈钢介质研磨的镁矾显示出改善的可浮性性能。
Grinding plays an important role in the beneficiation process. Different grinding media can determine the size distribution, shape, and even the surface properties of the produced material. However, comprehensive research related to the effect of grinding media on the flotation performance of cassiterite is lacking. In the current study, the effects on the flotability of the products obtained by grinding with ceramic and stainless steel media were investigated using micro-flotation, laser particle size distribution analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), chemical element analysis, zeta potential measurements, field emission scanning electron microscopy-energy dispersive spectroscopy (FESEM-EDS), and X-ray photoelectron spectroscopy (XPS). The micro-flotation results demonstrate that the flotability of stainless steel ground cassiterite surpasses that of ceramic. The laser particle size distribution test reveals that the two grinding media do not have a strong impact on the particle size distribution. The ICP-OES and chemical element analysis results identify the higher iron content in the samples and pulp of stainless steel ground cassiterite as the principle influencing factor. The zeta potential analysis indicates that the dissolved iron ions absorbed on the cassiterite surface results in a positive shift of the mineral surface potential. This not only reduces electrostatic repulsion but also increases the active sites of salicylhydroxamic acid (SHA) chemisorption. FESEM-EDS results demonstrate the rougher surface and higher iron content of the stainless steel ground cassiterite compared to the ceramic ground cassiterite, thereby increasing the SHA adsorption. The stainless steel grinding cassiterite was observed to alter the chemical environment of Fe species on the cassiterite surface via XPS analysis, with Fe2+exhibiting a stronger reactivity and stability towards SHA compared to Fe3+. Thus, the stainless steel media ground cassiterite demonstrates an improved flotability performance compared to the ceramic equivalent.
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