新型捕收剂SAA在菱镁矿和石英分离中的作用机制

    Mechanism of Action of a New Type of Collector SAA in the Separation of Magnesite and Quartz

    • 摘要: 这是一篇矿物加工工程领域的论文。通过单矿物浮选实验研究十八烷胺乙酸盐(SAA)对石英与菱镁矿浮选行为的影响,并通过Zeta电位、接触角、X射线光电子能谱(XPS)考查SAA在两种矿物表面的选择性捕收机理。单矿物浮选实验结果发现SAA对石英具有很高的选择性捕收能力,SAA在不同比例混合矿物浮选中均可以有效地去除菱镁矿中的石英。通过Zeta电位测量发现SAA捕收剂的添加使菱镁矿和石英表面等电点均发生正移,且石英表面等电点正移强度远大于菱镁矿,表明SAA具有较好的选择性。在接触角测试中,SAA可以使石英的接触角选择性增强,致使石英上浮,实现与菱镁矿的分离。根据XPS分析,SAA与石英表面结合强度相较于菱镁矿显著提升,当二者竞争吸附SAA时,SAA优先吸附在石英表面。因此,SAA可以用作高选择性捕收剂,有效地将菱镁矿与石英分离。

       

      Abstract: This is an article in the field of mineral processing engineering. The effect of stearylamine acetate (SAA) on the flotation behavior of quartz and magnesite was investigated by single-mineral flotation tests, and the selective trapping mechanism of SAA on the surfaces of the two minerals was examined by zeta potential, contact angle, and X-ray photoelectron spectroscopy (XPS). The results of single-mineral flotation tests showed that SAA has high selective trapping ability for quartz, and SAA can effectively remove quartz from magnesite in mixed-mineral flotation with different ratios. Through the zeta potential measurement, it is found that the addition of SAA trapping agent makes the isoelectric point of magnesite and quartz surfaces positively shifted, and the isoelectric point of quartz surfaces positively shifted intensity is much larger than that of magnesite, which indicates that SAA has better selectivity. In the contact angle test, SAA can enhance the contact angle selectivity of quartz, resulting in the uplift of quartz to realize the separation from magnesite. According to the XPS analysis, strength of SAA bonding to quartz surface significantly increased compared to magnesite, and when the two compete for adsorption of SAA, SAA is preferentially adsorbed on the quartz surface. Therefore, SAA can be used as a highly selective trapping agent to effectively separate magnesite from quartz.

       

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