Surface modification of smithsonite with ammonia to enhance the formation of sulfidization products and its response to flotation
Surface modification of smithsonite with ammonia to enhance the formation of sulfidization products and its response to flotation
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DOI：
10.1016/j.mineng.2019.03.021
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发表时间：
2019-06
影响因子：
4.8
通讯作者：
Qicheng Feng;S. Wen;X. Bai;Wei-Chian Chang;Cui Chuanfa-;Wen-juan Zhao
中科院分区：
文献类型：
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作者：
Qicheng Feng;S. Wen;X. Bai;Wei-Chian Chang;Cui Chuanfa-;Wen-juan Zhao
本文提出了一种用氨改性提高菱锌矿硫化浮选效果的方法。在相同的浮选条件下，氨改性菱锌矿由于强化了硫化作用，其可浮性优于裸菱铁矿。Zeta电位和表面吸附实验结果表明，氨水对菱锌矿表面的预改性增加了矿物表面吸附的硫离子物种的数量，从而促进了黄药物种在硫化矿物表面的附着，提高了矿物表面的疏水性。XPS测试表明，在添加Na2S之前用氨水进行表面改性，增加了矿物表面生成的硫化锌物种的数量，并改变了硫化产物的化学环境。通过溶液化学计算，研究了氨改性促进硫化物物种在菱锌矿表面吸附的活化机理。发现锌氨络合物与包裹在菱锌矿表面的亲水物种相互作用。这种相互作用增加了氨改性菱锌矿表面锌位的数量，从而增强了其硫化浮选。
This paper proposed a promising method of improving the sulfidization flotation of smithsonite through surface modification with ammonia. The floatability of ammonia-modified smithsonite was superior to that of bare smithsonite under the same flotation condition due to the enhanced sulfidization. Results of zeta potential and surface adsorption experiments showed that the preliminary modification of smithsonite surfaces with ammonia increased the amount of sulfide ion species adsorbed onto the mineral surface, thereby facilitating the attachment of xanthate species onto the sulfidized mineral surface and promoting its hydrophobicity. XPS measurement revealed that surface modification with ammonia prior to Na2S addition increased the amounts of zinc sulfide species formed on the mineral surface and altered the chemical environment of sulfidization products. Furthermore, the activation mechanism of ammonia modification for enhancing the adsorption of sulfide species onto the smithsonite surface was studied by solution chemistry calculations. Zinc ammonia complexes were found to interact with hydrophilic species coated on the smithsonite surface. This interaction increased the number of zinc sites on the surface of ammonia-modified smithsonite and thus enhanced its sulfidization flotation.