To achieve efficient separation of magnesite from quartz, a novel cationic collector—Dimethylaminopropyl lauramide (DPLA), was introduced into the quartz-magnesite reverse flotation system. The flotation performance and adsorption mechanism of DPLA on the minerals surfaces were investigated by micro-flotation tests, contact angle measurements, zeta-potential measurements, Fourier transform infrared spectroscopy (FTIR) analysis, Atomic force microscope (AFM), and Density functional theory (DFT) calculation. The single mineral micro-flotation results showed that when DPLA concentration was 25 mg/L, 94.6% of quartz was removed and 97.14% of magnesite was recovered under natural pulp pH. Further, the artificial mixed mineral flotation results demonstrated that DPLA had a superior selectivity for quartz and the concentrate with 44.36% MgO grade and 98.69% MgO recovery was obtained at 25 mg/L DPLA, and the separation efficiency was 89.52%. Contact angle measurement results suggested that the hydrophobicity of quartz surface increased significantly after treatment with DPLA and indicated the interaction between DPLA and quartz was stronger than that with magnesite. The results of zeta-potential measurements, FTIR, AFM, and DFT calculation revealed that the adsorption of DPLA on the quartz surface was mainly by the electrostatic force and hydrogen bonding interactions. In addition, the advantages of DPLA as the collector were analyzed in terms of environmental aspects and economics. DPLA has great potential for industrial application to effectively separate magnesite from quartz.

为实现菱镁矿与石英的高效分离，将新型阳离子捕收剂——二甲氨基丙基月桂酰胺（DPLA）引入石英-菱镁矿反浮选系统。通过微浮选试验、接触角测量、zeta电位测量、傅里叶变换红外光谱（FTIR）分析、原子力显微镜（AFM）和密度泛函理论研究了DPLA在矿物表面的浮选性能和吸附机理。 DFT) 计算。单矿物微浮选结果表明，当DPLA浓度为25 mg/L时，在天然矿浆pH下，石英被去除94.6%，菱镁矿回收率为97.14%。此外，人工混合矿物浮选结果表明，DPLA 对石英和 MgO 品位 44.36% 和 98 的精矿具有优异的选择性。在 25 mg/L DPLA 时获得 69% 的 MgO 回收率，分离效率为 89.52%。接触角测量结果表明，经 DPLA 处理后，石英表面的疏水性显着增加，表明 DPLA 与石英之间的相互作用强于菱镁矿。zeta电位测量、FTIR、AFM和DFT计算结果表明，DPLA在石英表面的吸附主要通过静电力和氢键相互作用。此外，从环境方面和经济方面分析了 DPLA 作为收集器的优势。DPLA 具有巨大的工业应用潜力，可有效分离菱镁矿和石英。接触角测量结果表明，经 DPLA 处理后，石英表面的疏水性显着增加，表明 DPLA 与石英之间的相互作用强于菱镁矿。zeta电位测量、FTIR、AFM和DFT计算结果表明，DPLA在石英表面的吸附主要通过静电力和氢键相互作用。此外，从环境方面和经济方面分析了 DPLA 作为收集器的优势。DPLA 具有巨大的工业应用潜力，可有效分离菱镁矿和石英。接触角测量结果表明，经 DPLA 处理后，石英表面的疏水性显着增加，表明 DPLA 与石英之间的相互作用强于菱镁矿。zeta电位测量、FTIR、AFM和DFT计算结果表明，DPLA在石英表面的吸附主要通过静电力和氢键相互作用。此外，从环境方面和经济方面分析了 DPLA 作为收集器的优势。DPLA 具有巨大的工业应用潜力，可有效分离菱镁矿和石英。zeta电位测量、FTIR、AFM和DFT计算结果表明，DPLA在石英表面的吸附主要通过静电力和氢键相互作用。此外，从环境方面和经济方面分析了 DPLA 作为收集器的优势。DPLA 具有巨大的工业应用潜力，可有效分离菱镁矿和石英。zeta电位测量、FTIR、AFM和DFT计算结果表明，DPLA在石英表面的吸附主要通过静电力和氢键相互作用。此外，从环境方面和经济方面分析了 DPLA 作为收集器的优势。DPLA 具有巨大的工业应用潜力，可有效分离菱镁矿和石英。