pH对油酸钠在钛铁矿与钛辉石表面吸附的影响.docx

201110Oct. 2011pH 对油酸钠在钛铁矿与钛辉石表面吸附的影响张国范，鄢代翠，朱阳戈， 2011 10 Oct. 2011 pH 对油酸钠在钛铁矿与钛辉石表面吸附的影响 张国范，鄢代翠，朱阳戈，冯其明，王维清 (中南大学 资源加工与生物工程学院，湖南 长沙，410083) 摘要：通过热力学计算、X 线光电子能谱及红外光谱测试，研究 pH 对油酸钠在钛铁矿与钛辉石表面吸附的影响。 研究结果表明：钛铁矿在 pH＞5.5 时都保持了较好的可浮性，钛辉石在 pH 为 6~9 和 pH＞10 的条件下具有一定 的可浮性；在酸性条件下，钛铁矿表面的 Fe3+，Ca2+，Mg2+和 Ti4+以及钛辉石表面的 Fe3+，Ca2+，Mg2+和 Al3+ 均能与油酸钠发生化学作用，其中钛铁矿表面的 Fe2+在浮选过程中可以被氧化为 Fe3+，成为矿物表面主要的活性 吸附点，继而油酸根离子取代羟基生成油酸铁而吸附于矿物表面；钛辉石表面则以 Ca2+和 Mg2+与油酸根的化学 作用为主。在碱性条件下，钛铁矿与钛辉石表面均主要以 Ca2+和 Mg2+为主与油酸钠作用。 关键词：钛铁矿；钛辉石；油酸钠；浮选；吸附 中图分类号：TD91 文献标志码：A 文章编号：1672?7207(2011)10?2898?07 Influence of pH on adsorption of sodium oleate on surface of ilmenite and titanaugite ZHANG Guo-fan, YAN Dai-cui, ZHU Yang-ge, FENG Qi-ming, WANG Wei-qing (School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China) Abstract: The influence of pH on adsorption of sodium oleate on the surface of ilmenite and titanaugite was studied by means of thermodynamics calculation, infrared spectrum and X-ray photoelectron spectroscopy analysis. The results show that ilmenite displays good floatability when pH＞5.5, and titanaugite possesses certain floatability when pH is 6?9 and pH＞10. Under acidic condition, ions of Fe3+, Ca2+, Mg2+ and Ti4+ on ilmenite surface and ions of Fe3+, Ca2+, Mg2+ and Al3+ on titanaugite surface are able to chemically react with sodium oleate. Fe3+ derived from the oxidation of Fe2+ on ilmenite surface during the flotation process becomes the major activated adsorption site, which results in the adsorption of the iron oleate coming from the replacement of hydroxyl group by oleate ion on the surface of ilmenite. For titanaugite, however, the chemical reaction between Ca2+, Mg2+ and oleate ion is the main mechanism. On the other hand, on alkali condition, oleate reacts mainly with Ca2+and Mg2+ on both of ilmenite and titanaugite. Key words: ilmenite; titanaugite; sodium oleate; flotation; adsorption 攀枝花钛铁矿属于高钙镁的钛铁矿，除 Ti 和 Fe 外，还含有 Ca，Mg，Al，Si，V 和 Mn 等多种杂质成 分。其中