Correlation of surface oxidation with xanthate adsorption and pyrite flotation
Correlation of surface oxidation with xanthate adsorption and pyrite flotation
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表面氧化与黄药吸附和黄铁矿浮选的相关性
DOI：
10.1016/j.apsusc.2019.07.153
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发表时间：
2019-11
影响因子：
6.7
通讯作者：
Ruan Renman
中科院分区：
文献类型：
--
作者：
Niu Xiaopeng;Chen Jianhua;Li Yuqiong;Xia Liuyin;Li Li;Sun Heyun;Ruan Renman
各种研究强调了硫化矿物表面氧化对黄药吸附及其浮选响应的重要性。然而，黄铁矿表面氧化、黄药吸附与其浮选反应之间的关系尚未明确。复杂性在于不同溶液条件下硫氧化中间产物的多样性。因此，研究硫的氧化行为是了解黄铁矿氧化过程的关键。离子色谱（IC）和高效液相色谱（HPLC）分析结果表明，随着矿浆pH值的升高，黄铁矿表面硫物种的总量增加，同时SO2/SO2的比值降低; X射线光电子能谱（XPS）分析表明，氧化黄铁矿表面富含SO 42 −和FeOOH。接触角结果和单矿物浮选数据均表明，黄铁矿表面氧化程度越高，疏水性越差，可浮性越差。采用飞行时间二次离子质谱（Tof-SIMS）技术研究了黄药在黄铁矿表面的吸附行为。在强烈氧化的黄铁矿表面，C4 H9 O和C4 H9 OCSS的强度明显降低，表明黄药对FeS 2的吸附具有较强的选择性，而对FeOOH的吸附则没有明显的选择性。理论计算进一步证实了实验结果。自洽电荷密度泛函紧束缚（SCC-DFTB）计算表明，黄原酸盐S原子与FeOOH表面Fe原子之间的距离大于S单键Fe的原子半径.根据配位化学理论，黄原酸盐在FeOOH和FeS 2表面的选择性吸附主要是由于其Fe原子的电子构型不同所致。研究结果为了解黄铁矿表面氧化、黄药吸附及其浮选行为之间的相互关系提供了有益的启示。
Various studies have emphasized the importance of surface oxidation of sulfide minerals with regard to xanthate adsorption and their flotation response. However, the correlation between pyrite surface oxidation, xanthate adsorption and its flotation response has not been clearly established. The complexity lies in various intermediate sulfur oxidation products in different solution conditions. Thus, investigation of sulfur oxidation behavior is the key to understand pyrite oxidation. Ion chromatography (IC) and high performance liquid chromatography (HPLC) results showed an increase in the total amounts of occurring sulfur species with increasing slurry pH. Meanwhile, the ratio of S0/sulfur oxyanions was to become lower; X-ray Photoelectron Spectroscopy (XPS) identified the oxidized pyrite surface was rich in SO42−and FeOOH. Both the contact angle results and single mineral flotation data indicated that the more pyrite surface oxidized, the lower hydrophobicity and floatability were. Time-of-flight secondary ion mass spectroscopy (Tof-SIMS) was adopted to analyse xanthate adsorption on the surface of pyrite under conditions of either sufficient oxidation or on freshly polished surface which is assumed little oxidation. A significantly lower intensities of C4H9O and C4H9OCSS was found on the intensely oxidized pyrite surface, indicating xanthate adsorption had strong selectivity on FeS2rather than FeOOH. The experimental results were further confirmed by theoretical calculation. The self-consistent charge density functional tight binding (SCC-DFTB) calculations indicated that the distances between the xanthate S atoms and surface Fe atoms of FeOOH were larger than the atomic radius of Ssingle bondFe. Essentially, the different electron configurations of their Fe atoms led to the selective adsorption of xanthate on FeOOH and FeS2surfaces in terms of the coordination chemistry theory. This work provides valuable implications for understanding the correlation of surface oxidation, xanthate adsorption and its floatation behavior to mediate pyrite flotation.
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