A phosphate ore from the Catalão mine (Brazil) poses a challenge for apatite flotation from its carbonate gangue minerals. In recent developments, selectivity has been enhanced by using CO₂ instead of air. The adsorption of the sulfosuccinate collector on apatite and carbonates, with air or CO₂, was studied through infrared spectrometry (FTIR, transmission mode), X-ray photoelectron spectroscopy (XPS) and zeta potential techniques. The FTIR spectra of apatite and carbonates treated with sulfosuccinate showed the presence of new adsorbed bands on apatite (1725 cm⁻¹), consequently the chemical adsorption of the collector, but not on the carbonates. It is believed that this occurs due to the low adsorption density of the collector, which also generates a good selectivity between apatite and the carbonates. The XPS spectra of the apatite surface after conditioning with the collector characterized sulfosuccinate adsorption. The sulphur/carbon (S/C) ratio, however, is well below the value assayed for the pure reagent for absorption in the presence of air, while it matches this figure (S/C = 0.036) when adsorption is performed with CO₂ injection. Carbon dioxide thus enhances the collector adsorption on apatite. Successful flotation concentration of apatite with carbonate gangue of the phosphate ore from the Catalão mine is therefore linked to the use of sulfosuccinate as collector, which is highly selective for apatite. The selectivity is enhanced by using CO₂ as a gas to generate bubbles.

来自Catalão矿山（巴西）的磷酸盐矿对从其碳酸盐石矿物中磷灰石的浮选提出了挑战。在最近的发展中，通过使用CO ₂代替空气来提高选择性。通过红外光谱（FTIR，透射模式），X射线光电子能谱（XPS）和ζ电位技术研究了磺基琥珀酸盐捕集剂在磷灰石和碳酸盐上与空气或CO ₂的吸附。磺基琥珀酸盐处理的磷灰石和碳酸盐的FTIR光谱表明，在磷灰石（1725 cm ^-1），因此，捕收剂的化学吸附，而不是碳酸盐上的吸附。据信，这是由于收集器的低吸附密度而发生的，这也使磷灰石与碳酸盐之间产生了良好的选择性。用收集器调节后，磷灰石表面的XPS光谱表征了磺基琥珀酸酯的吸附。但是，硫/碳（S / C）之比远低于纯存在空气的吸附剂的测定值，而当用CO ₂进行吸附时，硫/碳（S / C）值与该值（S / C = 0.036）相匹配。注射。因此，二氧化碳增强了捕收剂在磷灰石上的吸附。因此，来自Catalão矿山的磷酸盐矿的碳酸盐煤石成功地浮选富集了磷灰石，这与使用磺基琥珀酸盐作为捕收剂有关，后者对磷灰石具有高度选择性。通过使用CO ₂作为气体产生气泡来提高选择性。