Abstract: The flotation behaviors of rutile in combined regent system of sodium oleate (SO) and sodium benzohydroxamide (BHA) were studied via pure mineral flotation test. The interactions between reagents, reagents and mineral as well as the effect of the reagent combination on rutile flotation had been investigated through several measurements, including Zeta potential, contact angle, surface tension, UV diffuse reflectance spectroscope, concerning the interface chemistry properties at gas?liquid interface and solid?liquid interface. The results indicated that the reagent addition sequence influenced rutile recovery significantly and the combined use of reagent had a distinct positive-synergistic effect under different pH values. The flotation recovery of rutile and synergistic effect index followed the order: adding BHA prior to SO>pre-mixed before adding>adding SO prior to BHA. The electron-rich double bond in SO may interact with the electron-deficient benzene ring in BHA to form diverse interionic/intermolecular association complexes. The amount of the complex presented as the optimum configuration on mineral surface was critical for the synergistic effect of reagent combination and rutile flotation behavior. The effect of reagent combination on flotation recovery rate agreed well with that on the rutile bandgap width according to the UV diffuse reflectance spectroscope spectrum of rutile sample after interacted with the reagent combination under various conditions.with the electron-deficient benzene ring in BHA to form diverse interionic association complexes. The amount of the complex presented as the optimum configuration on mineral surface is critical for the synergistic effect of reagent combination and rutile flotation behavior. The effect of reagent combination on flotation recovery agree well with that on the rutile bandgap width according to the UV diffuse reflectance spectroscope spectrum of rutile sample after interacted with the reagent combination under various conditions.

Key words: rutile flotation, reagent combination, association complex, UV diffuse reflectance, synergistic effect

摘要： 采用单矿物浮选实验研究了油酸钠(SO)和苯甲羟肟酸钠(BHA)组合药剂体系中金红石的浮选行为，利用Zeta电位、接触角、表面张力、紫外漫反射光谱等手段分别从固?液、液?液界面化学角度研究了组合药剂之间、组合药剂与矿物之间的作用机制以及组合药剂对金红石浮选行为的影响机理。结果表明，药剂添加顺序对金红石浮选回收率有较大影响，不同pH值下组合药剂之间有明显的正协同效应，金红石回收率及协同效应指数的大小顺序为先苯甲羟肟酸钠后油酸钠>预先混合再添加>先油酸钠后苯甲羟肟酸钠；油酸根离子中富电子的双键与苯甲羟肟酸根离子中缺电子的苯环可能发生电子共轭效应并可生成多种离子间缔合物，缔合物在金红石表面吸附时最佳空间几何构象能否形成及形成数量的多寡对药剂之间的协同效应及金红石的浮选行为具有举足轻重的影响。金红石与组合药剂作用后的漫反射光谱显示组合药剂对金红石浮选回收率与其对金红石带隙宽度的影响顺序一致。

关键词: 金红石浮选, 组合药剂, 缔合物, 紫外漫反射, 协同作用