2-羟基-3-萘甲基异羟肟酸与锡石的选择性分离行为及相互作用机理研究,Minerals

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2-羟基-3-萘甲基异羟肟酸与锡石的选择性分离行为及相互作用机理研究
Minerals ( IF 2.2 ) Pub Date : 2023-12-28 , DOI: 10.3390/min14010029
Shipeng Wu ₁ , Zhongming Wang ₁ , Fang Liu ₁ , Chen Zhao ₁ , Yangge Zhu ₁

Affiliation

在本研究中，研究了 2-羟基-3-萘甲基异羟肟酸 (NHA) 在锡石浮选中的性能。目的是首次了解NHA的作用机制。通过微泡浮选实验研究了 NHA 作为捕收剂在锡石、方解石和石英浮选分离中的效果。实验结果表明，NHA存在下锡石的最大回收率为91.76%。这归因于 NHA 在锡石表面的选择性吸附。NHA 对锡石表现出比方解石和石英更强的收集性能。因此，我们利用 zeta 电位、对数溶解度图 (LSD)、傅里叶变换红外 (FT-IR)、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 分析研究了 NHA-锡石相互作用的机制。本研究介绍了基于 NHA 的锡石吸附的新吸附过程和机制。结果表明，在中性条件下，锡石表面晶格离子的溶质成分主要以Sn-OH络合物的形式存在。化学吸附发生在锡石和 NHA 之间，NHA 通过与 O 位点（而不是传统预期的 Sn 位点）相互作用而吸附到锡石表面。此外，NHA的羟基和羟基与锡石表面的Sn-OH发生化学配位，形成六元螯合环。这种提出的机制可以扩展到大多数金属离子与带有羟基的异羟肟酸相互作用的系统。这有助于更好地了解异羟肟酸捕收剂在锡石浮选中的活化机制。

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Selective Separation Behavior and Study on the Interaction Mechanism of 2-Hydroxy-3-Naphthylmethyl Hydroxamic Acid and Cassiterite

In this study, the performance of 2-hydroxy-3-naphthylmethyl hydroxamic acid (NHA) in cassiterite flotation was investigated. The aim was to understand the mechanism of action of NHA for the first time. The effect of NHA as a collector in the flotation separation of cassiterite, calcite, and quartz was investigated via microbubble flotation experiments. The experimental results showed that the maximum recovery of cassiterite in the presence of NHA was 91.76%. This was attributed to the selective adsorption of NHA on the cassiterite surface. NHA showed a stronger collection performance for cassiterite than calcite and quartz. Therefore, the mechanism of NHA-cassiterite interaction was investigated using zeta potential, the logarithmic solubility plot (LSD), Fourier Transform Infrared (FT-IR), X-ray Photoelectron Spectroscopy (XPS), and Scanning Electron Microscope (SEM) analyses. This study introduces a new adsorption process and mechanism for the NHA-based adsorption of cassiterite. The results show that, under neutral conditions, the solute components of cassiterite surface lattice ions mainly exist in the form of Sn–OH complexes. Chemisorption occurs between cassiterite and NHA which is adsorbed onto the cassiterite surfaces through interaction with O sites, rather than Sn sites as is traditionally expected. Further, the hydroxyl and hydroxyl groups of NHA are chemically coordinated with Sn–OH on the surface of cassiterite to form a six-membered chelate ring. This proposed mechanism can be extended to most systems in which metal ions interact with hydroxamic acids bearing hydroxyl groups. This contributes to a better understanding of the activation mechanism of hydroxamic acid collectors in cassiterite flotation.

更新日期：2023-12-28

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