Herein, a novel surfactant dihexyl (2-amino-2-(hydroxyimino)ethyl) phosphonate (DHAHEP) was synthesized by combining phosphonate and amidoxime groups in the same molecule, and used as a flotation collector for quartz vein-type wolframite. The Micro-flotation results showed that DHAHEP has excellent collection performance for wolframite, at pH 2 ∼ 4.5, the flotation recovery of DHAHEP for wolframite was over 90 %, while that for quartz was less than 60 %. The wolframite-quartz artificial mixed ores experiments demonstrated that at pH ∼ 4 and DHAHEP concentration of 8 × 10^-5 mol·L^-1, the flotation recovery of wolframite was 64.5 % and the grade was 48.9 %. Zeta potential and contact angle experiments elucidated that DHAHEP anchored on the wolframite surface mainly in the form of cations, increasing the hydrophobicity of the surface and thus separating the wolframite from quartz by flotation. FTIR, XPS, and DFT calculation further revealed that DHAHEP had an obvious flotation separation effect on quartz vein-type wolframite, it was mainly electrostatically adsorbed on the WO₄^2- sites on the wolframite surface in the form of cations, and also captured wolframite by forming chemical bonds with the Fe active sites through the phosphoryl and amidoxime groups in its molecular structure.

中文翻译：

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一种新的表面活性剂二己基（2-氨基-2-（羟基亚氨基）乙基）膦酸盐作为黑钨矿与石英浮选分离的捕收剂


在此，通过将膦酸盐和酰胺肟基团结合在同一分子中合成了一种新型表面活性剂二己基（2-氨基-2-（羟基亚氨基）乙基）膦酸盐 （DHAHEP），并用作石英脉型黑钨矿的浮选捕收剂。微浮选结果表明，DHAHEP 对黑钨矿具有优异的收集性能，在 pH 2 ∼ 4.5 时，DHAHEP 对黑钨矿的浮选回收率在 90 % 以上，而对石英的浮选回收率低于 60%。黑钨矿-石英人工混合矿石实验表明，在 pH ∼ 4 和 DHAHEP 浓度为 8 × ^10-5 mol·^L-1 中，黑钨矿的浮选回收率为 64.5 %，品位为 48.9 %。Zeta 电位和接触角实验阐明，DHAHEP 主要以阳离子的形式锚定在黑钨矿表面，增加了表面的疏水性，从而通过浮选将黑钨矿与石英分离。FTIR、XPS 和 DFT 计算进一步表明，DHAHEP 对石英脉型黑钨矿具有明显的浮选分离效果，它主要以阳离子的形式静电吸附在黑钨矿表面的 WO₄^2- 位点上，还通过其分子结构中的磷酸基和氨基肟基团与 Fe 活性位点形成化学键来捕获黑钨矿。