In this work, N-tetradecyl-isopropanolamine (NTIA) is synthesized and used as a new collector on the flotation separation process of scheelite from calcite to further improve the efficiency of the selective flotation. The effects of NTIA on minerals are investigated through microflotation experiments. Flotation experimental results show that NTIA provides good flotation and separation effects on the scheelite in a wide range of pulp pH (6.0–10.0). At pH 7.0, the flotation recovery of scheelite reaches 96.89%, while calcite to only 10%. Moreover, it also reveals an efficient separation effect for artificial mixed minerals of scheelite and calcite under certain conditions. The adsorption behavior of NTIA on scheelite is further studied using wettability test, infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and zeta potential analysis. The results demonstrate that the surface of scheelite is preferentially modified, increasing its hydrophobicity after treatment with NTIA. Meanwhile, under the action of hydrogen bonding and strong electrostatic field in the hydrophilic N–H group of NTIA, the NTIA molecules are absorbed on the scheelite surface.

在这项工作中，合成了N-十四烷基-异丙醇胺（NTIA），并将其用作方解石白钨矿浮选过程中的新型捕收剂，以进一步提高选择性浮选的效率。通过微浮选实验研究了NTIA对矿物的影响。浮选实验结果表明，NTIA在广泛的纸浆pH（6.0-10.0）范围内对白钨矿提供良好的浮选和分离效果。在pH 7.0时，白钨矿的浮选回收率达到96.89％，而方解石的浮选回收率仅为10％。此外，它还揭示了在某些条件下对白钨矿和方解石的人工混合矿物的有效分离效果。使用润湿性测试，红外光谱（FTIR），X射线光电子能谱（XPS），和zeta电位分析。结果表明白钨矿的表面被优先改性，用NTIA处理后增加了其疏水性。同时，在NTIA的亲水性N–H基团中，在氢键和强静电场的作用下，NTIA分子被吸附在白钨矿表面上。