Abstract A new complex DPA-BDDA was prepared by decyloxy-propyl-amine (DPA) and α-bromododecanoic acid (α-BDDA) as a collector in the flotation of spodumene and feldspar respectively. The flotation was investigated under different conditions. In particular, molar ratio of DPA: α-BDDA, the optimum pH, and DPA-BDDA dosage were studied. It was found that the greatest difference of recovery (spodumene 82.14% and feldspar 32.48%) occurred by using 14.28 mg/L of DPA-BDDA (molar ratio of DPA: α-BDDA 1:1) at pH of 4.48. The flotation adsorption mechanism of DPA-BDDA on spodumene and feldspar surface was searched by DLS, FT-IR, XPS and zeta potential measurements. The FT-IR results indicated that there was halogen bond effect between DPA and α-BDDA, which demonstrated that the DPA and α-BDDA were formed supermolecules. Although the active sites on broken surfaces of spodumene and feldspar were Al and O sites, the type and the number of Al and O sites per unit area on spodumene and feldspar were different, which might lead to the difference of surface chemistry features of spodumene and feldspar. The XPS results indicated that the quantity of DPA-BDDA adsorbed on spodumene surface was higher than that on feldspar surface. The results also revealed that DPA-BDDA was adsorbed on spodumene surface through both electrostatic attraction and chemisorption. In addition, the electrostatic attraction between NH3+ and spodumene negative surface reduced the electrostatic repulsion between COO− and spodumene surface, which facilitated the adsorption of DPA-BDDA on spodumene. However, since the more negative surface of feldspar, the steric hindrance effect and less Al sites on feldspar surface, the DPA-BDDA was adsorbed on feldspar mainly by electrostatic attraction.

中文翻译：

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新型癸氧基丙胺α-溴十二烷酸配合物浮选锂辉石长石的微分捕集性能

摘要 以癸氧基丙胺（DPA）和α-溴十二烷酸（α-BDDA）为捕收剂，分别用于锂辉石和长石的浮选，制备了新型络合物DPA-BDDA。在不同条件下研究了浮选。特别是，研究了 DPA: α-BDDA 的摩尔比、最适 pH 值和 DPA-BDDA 剂量。发现回收率的最大差异（锂辉石 82.14% 和长石 32.48%）发生在使用 14.28 mg/L DPA-BDDA（DPA: α-BDDA 的摩尔比 1:1），pH 值为 4.48。通过DLS、FT-IR、XPS和zeta电位测量研究了DPA-BDDA在锂辉石和长石表面的浮选吸附机理。FT-IR结果表明DPA和α-BDDA之间存在卤键效应，表明DPA和α-BDDA形成了超分子。虽然锂辉石和长石破碎表面的活性位点为Al和O位点，但锂辉石和长石上单位面积Al和O位点的类型和数量不同，这可能导致锂辉石和长石表面化学特征的差异。长石。XPS结果表明锂辉石表面的DPA-BDDA吸附量高于长石表面。结果还表明，DPA-BDDA 通过静电吸引和化学吸附被吸附在锂辉石表面。此外，NH3+与锂辉石负极表面之间的静电吸引力降低了COO−与锂辉石表面之间的静电排斥，从而促进了DPA-BDDA在锂辉石上的吸附。然而，由于长石的表面更负，