中文摘要：

通过红外光谱（FT-IR）和X射线光电子能谱（XPS）分析，研究钛铁矿与钛辉石的表面溶解行为对其浮选分离的影响。实验结果表明，弱酸性条件下的表面溶解有利于提高钛铁矿与钛辉石的可浮性差异。在弱酸性条件下，由于钛铁矿与油酸钠的作用以Fe为主，而表面溶解有利于其在钛铁矿表面的氧化，使钛铁矿可浮性得到提高；同时，油酸钠与Ca和Mg的作用导致了钛辉石的可浮选，但表面溶解降低了钛辉石表面Ca和Mg的含量，使钛辉石可浮性明显下降。对于原矿TiO2品位为8．41％的攀枝花钛铁矿，经表面溶解处理后浮选可将粗选精矿TiO2的品位由26．7％提高到31．73％。

英文摘要：

The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic （FT-IR） analysis and X-ray photoelectron spectroscopy （XPS） test. The results show that surface dissolution in weak acid solution is helpful to enlarge the floatability difference between ilmenite and titanaugite. In weak acidic solution, as sodium oleate mainly interacts with Fe which results in ilmenite flotation, and surface dissolution is beneficial to its oxidation, the floatability of ilmenite after surface dissolution is increased; meanwhile, sodium oleate interacts with Ca and Mg which results in titanangite flotation, and the quantities of Ca and Mg on the surface of titanautite are decreased due to the surface dissolution, so the floatability of titanaugite after surface dissolution is depressed. For an ilmenite ore obtained from Panzhihua with TiO2 grade of 8.41%, flotation after surface dissolution treatment could increase TiO2 grade of rough concentrate from 26.7% to 31.73 %.