Combined effect of chemical composition and spreading velocity of collector on flotation performance of oxidized coal
Combined effect of chemical composition and spreading velocity of collector on flotation performance of oxidized coal
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DOI：
10.1016/j.powtec.2017.09.047
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发表时间：
2018-02
影响因子：
5.2
通讯作者：
Yingwei Wang;Yijun Cao;Guosheng Li;Yinfei Liao;Yaowen Xing;X. Gui
中科院分区：
文献类型：
--
作者：
Yingwei Wang;Yijun Cao;Guosheng Li;Yinfei Liao;Yaowen Xing;X. Gui
研究了捕收剂的化学组成和铺展速度对氧化煤浮选性能的综合影响。采用H2 O2溶液氧化法制备氧化煤样。X射线光电子能谱（XPS）分析表明，煤表面含氧基团的含量随着氧化程度的增加而增加，水接触角测定表明，煤表面亲水性增强。比较了柴油捕收剂、新型捕收剂a（NCA）和新型捕收剂B（NCB）3种原油捕收剂的化学组成和铺展速度。FTIR分析结果表明，含氧基团的含量为NCB > NCA >柴油。由界面张力、粘度和煤-油-水接触角测定结果确定的铺展速度大小顺序为柴油> NCA > NCB。浮选动力学实验表明，NCA具有较高的含氧基团诱导吸附和较高的铺展速度实现在煤表面的快速铺展，沿着保持最快的浮选速率，而柴油和NCB的浮选速率主要取决于煤表面的氧化程度。这可以用捕收剂的化学成分和铺展速度的联合作用机理来解释。在氧化煤浮选过程中，捕收剂的含氧基团在捕收剂与颗粒的粘附过程中起主导作用，决定了捕收剂能否吸附在氧化物表面，而铺展速度在铺展过程中起主导作用，影响最终的浮选率。
In this study, the combined effect of chemical composition and spreading velocity of collector on flotation performance of oxidized coal was investigated. Oxidized coal samples were prepared using the H2O2solution oxidation method. The contents of oxygen-containing groups on the coal surface increased with the oxidation degree by X-ray photoelectron spectroscopy (XPS) analysis and the coal surface became more hydrophilic by water contact angle measurement. The chemical composition and the spreading velocity of three oily collectors, including diesel collector, novel collector a (NCA), and novel collector b (NCB), were compared. The content of oxygen-containing groups was the order of NCB > NCA > diesel by FTIR analysis. The spreading velocity determined from the interfacial tension, viscosity and coal-oil-water contact angle measurement results showed the order of diesel > NCA > NCB. With more oxygen-containing groups to induce adsorption and higher spreading velocity to achieve spreading rapidly on the coal surface, NCA kept the fastest flotation rate all along by flotation kinetics experiment, while the flotation rates of diesel and NCB depend a lot on the oxidation degree of coal surface. This can be explained by a combined interaction mechanism from chemical composition and spreading velocity of collector. During the oxidized coal flotation, oxygen-containing groups of collector played a leading role in the collector-particle adhesion process which determined whether the collector can adsorb on the oxidized surface, while the spreading velocity acted as a dominant part in the spreading process which affected the final flotation rate.