In this study, monosodium phosphate (MSP) was used as a regulator for simultaneous separation of quartz and dolomite from magnesite with dodecylamine (DDA) as a collector via reverse flotation. The results of micro-flotation tests indicated that MSP had a selective activation effect on the dolomite flotation, which made the flotation behavior of dolomite similar to that of quartz under DDA as a collector. Further, batch flotation results showed that MSP could effectively simultaneous removal of quartz and dolomite from magnesium-bearing carbonate ores. Contact-angle tests revealed that MSP could selectively increase the contact angle of dolomite, resulting in the high hydrophobicity of dolomite in the presence of DDA, but it has no such effect on magnesite and quartz surface. Field emission scanning electron microcopy (FESEM) with an energy dispersive X-ray spectrometer (EDS) detection suggested that MSP was mainly adsorbed on dolomite and changed its surface characteristics rather than quartz and magnesite. Based on the Fourier transform infrared (FTIR) analysis, MSP could selectively improve the adsorption of DDA onto the dolomite surface.

在本研究中，磷酸一钠 (MSP) 用作调节剂，通过反浮选以十二胺 (DDA) 作为捕收剂，同时从菱镁矿中分离石英和白云石。微浮选试验结果表明，MSP对白云石的浮选具有选择性活化作用，使得白云石在DDA作为捕收剂下的浮选行为与石英相似。此外，批量浮选结果表明MSP可以有效地同时去除含镁碳酸盐矿石中的石英和白云石。接触角测试表明MSP可以选择性地增加白云石的接触角，导致在DDA存在下白云石的高疏水性，但对菱镁矿和石英表面没有这种影响。场发射扫描电子显微镜 (FESEM) 和能量色散 X 射线光谱仪 (EDS) 检测表明 MSP 主要吸附在白云石上并改变其表面特性，而不是石英和菱镁矿。基于傅里叶变换红外 (FTIR) 分析，MSP 可以选择性地提高 DDA 对白云石表面的吸附。