Adsorption of polystyrenesulfonate on titanaugite surface: Experiments and quantum chemical calculations
Adsorption of polystyrenesulfonate on titanaugite surface: Experiments and quantum chemical calculations
复制标题
DOI：
10.1016/j.molliq.2020.114167
复制
发表时间：
2020-08
影响因子：
6
通讯作者：
Zhen Wang;Rui Xu;Li Wang
中科院分区：
文献类型：
--
作者：
Zhen Wang;Rui Xu;Li Wang
钛辉石与钛铁矿具有相似的疏水性，抑制钛辉石是钛铁矿浮选的关键问题之一。本文通过实验和量子化学计算研究了新型表面活性剂聚苯乙烯磺酸钠（SP）在钛辉石表面的吸附性能。XPS结果表明，SP是通过磺酸基与钛辉石表面Al、Fe、Ca、Mg原子的相互作用而化学吸附在钛辉石表面的。Al元素的含量下降幅度最大，为5.12%，Fe/Mg/Ca次之，说明Al原子是吸附SP的主要作用位点。量子化学计算结果表明，SP与上述4种金属原子的结合能大小顺序为Al > Fe > Mg > Ca，表明Al是SP与Al的主要作用位点，这与XPS结果一致。微浮选试验结果表明，SP可用于钛辉石的选择性浮选，这可能是由于钛辉石表面存在Al原子，而钛铁矿表面不存在Al原子。在此基础上，提出了SP抑制钛辉石浮选的建议模型，并进行了详细的论证。
The depression of titanaugite is one of the key challenge in the ilmenite flotation due to their similar natural hydrophobicity. This paper focus on the adsorption performance of new depressant sodium polystyrenesulfonate (SP) on titanaugite surface through experiments and quantum chemical calculation. XPS results illustrates that SP is chemically adsorbed on the titanaugite surface through the interaction of the sulfo groups with the atoms of Al, Fe, Ca, and Mg on the titanaugite surface. Also, Al element shows the greatest content decrease 5.12% and Fe/Mg/Ca took the second place, indicating the Al atoms are the main interaction sites for SP adsorption. Quantum chemical calculation shows that the binding energy of SP with the above four metal atoms are in the sequence of Al > Fe > Mg > Ca, suggesting Al as the main interaction site with SP, with the same conclusion with XPS results. The micro flotation results verifies that SP is qualified for the selective depressant of titanaugite for ilmenite/titanaugite separation, which may base on the fact that Al atoms are presence on titanaugite but absence on ilmenite surface. Based on these findings, a suggested model for SP depressing titanaugite flotation was proposed and displayed in detail.