In this paper, using methyl cinnamate as raw material, the new cinnamic hydroxamic acid collector (CIHA) was synthesized by the hydroxylamine method. The collector performance of hydroxamic acid was investigated for scheelite and gangue calcite, and the flotation separation test of scheelite and calcite was carried out with CIHA as the collector. The interaction mechanism between hydroxamic acid and scheelite minerals has also been investigated through zeta potential, Fourier transform infrared spectroscopy (FTIR) experiments, X-ray photoelectron spectroscopy (XPS) experiments, and density functional theory (DFT) calculation. The single mineral flotation test and artificially mixed ore showed that CIHA had an excellent collection effect and selectivity. Zeta potential, FTIR, and XPS showed that CIHA was adsorbed on the scheelite surface by strong chemical adsorption. The active group of CIHA was analyzed through quantum chemical calculation. It was speculated that CO and NO bonds could synthesize a five-membered chelated hydroxamic acid group with Ca element chelate on scheelite surface, changing hydrophobicity and making it more likely to emerge from the pulp.

本文以肉桂酸甲酯为原料，采用羟胺法合成了新型肉桂异羟肟酸捕收剂（CIHA）。研究了异羟肟酸对白钨矿和脉石方解石的捕收性能，并以CIHA为捕收剂进行了白钨矿和方解石的浮选分离试验。通过zeta电位、傅里叶变换红外光谱（FTIR）实验、X射线光电子能谱（XPS）实验和密度泛函理论（DFT）计算，研究了异羟肟酸与白钨矿矿物之间的相互作用机制。单一矿物浮选试验和人工混合矿石表明CIHA具有优良的捕收效果和选择性。Zeta 电位、FTIR、XPS显示CIHA通过强烈的化学吸附作用吸附在白钨矿表面。通过量子化学计算分析了CIHA的活性基团。据推测，CO和N O键可以在白钨矿表面与Ca元素螯合物合成五元螯合异羟肟酸基团，改变疏水性，使其更容易从矿浆中析出。