胶磷矿浮选泡沫稳定性研究

以贵州福泉氟磷灰石、石英、白云石和方解石纯矿物浮选泡沫为研究对象，分析胶磷矿浮选泡沫稳定性，通过泡沫稳定性测试、三相接触角测量和泡沫光学图像观察，研究胶磷矿中四种主要矿物在不同捕收剂浓度、矿物颗粒粒度和质量浓度下的浮选泡沫稳定性，并考察白云石和方解石溶解产生的Ca2+、Mg2+对泡沫稳定性的影响。研究结果表明：氟磷灰石、白云石和方解石分散体系的三相泡沫稳定性均随着十二胺浓度的增大而增加，接触角变化幅度不大。石英颗粒的泡沫稳定性先增加后降低，接触角在十二胺浓度1.5×10-4mol·L-1后大于90°，表现出极强的疏水性；四种矿物颗粒体系的三相泡沫稳定性均随着颗粒粒度的增大而逐渐减小，随着颗粒质量浓度增大而增加。通过泡沫图像发现，矿物颗粒黏附在泡膜表面，液膜变厚，提高了泡沫稳定性；白云石和方解石溶解产生的Ca2+、Mg2+对泡沫稳定性具有促进作用。

Study on the stability of collophane flotation foam

The flotation foam of pure minerals fluorapatite, quartz, dolomite and calcite was taken as the research object to analyze the flotation foam stability of collophanite. Through foam stability test and three-phase antennae measurement, the flotation foam stability of four main minerals in collophanite under different collector concentration, mineral particle size and mass concentration was studied. The influence of Ca2+ and Mg2+ produced by dolomite and calcite dissolution on the foam stability was investigated. The results show that with the increase of dodecylamine concentration, the three-phase foam stability of fluorapatite, dolomite and calcite dispersion system increases gradually, and the contact Angle changes little. The foam stability of quartz particles increases first and then decreases. The concentration of dodecylamine is greater than 1.5×10-4mol·L-1, and the contact Angle is greater than 90°, showing strong hydrophobicity; The three-phase foam stability of the four mineral particle systems all gradually decreased with the increase of particle size, and increased with the increase of particle mass concentration. Through the foam image, it is found that the mineral particles adhere to the surface of the foam film, the liquid film becomes thicker, and the foam stability is improved; The Ca2+ and Mg2+ produced by dolomite and calcite dissolution can promote the foam stability.