In this study, coal tar, an industrial by-product of the carbonization/gasification of coal, was adopted as an economical flotation collector for recovering clean oxidized coal. The characteristics of high-temperature coal tar (HTCT), its performance as a flotation collector, and the interaction mechanism between HTCT and oxidized coal were analyzed by gas chromatography/mass spectrometry, flotation experiments, X-ray photoelectron spectroscopy, and dynamic contact angle measurements. The results revealed that HTCT has a strong selective collection ability because it contains a large number of aliphatic and aromatic compounds with oxygen-containing functional groups. At HTCT dosage of 3000 g/t, 79.23% of combustible matter with an ash content of 9.99% was obtained. The major mechanism responsible for the enhanced oxidized coal separation is that, with the adsorption of HTCT onto oxidized coal, the C–O hydrophilic functional groups were covered and an increased amount of the C–C/C–H hydrophobic functional groups of the oxidized coal surface was exposed, resulting in improved surface hydrophobicity and floatability of the oxidized coal. This study provides valuable guidelines for the re-utilization of coal tar and the flotation upgradation of oxidized coal.

在这项研究中，煤焦油是煤炭碳化/气化的工业副产品，被用作经济的浮选收集器，用于回收清洁的氧化煤。通过气相色谱/质谱，浮选实验，X射线光电子能谱和动态接触角分析了高温煤焦油（HTCT）的特性，其作为浮选捕收剂的性能以及HTCT与氧化煤之间的相互作用机理。测量。结果表明，HTCT具有很强的选择性收集能力，因为它包含大量带有含氧官能团的脂族和芳族化合物。在3000 g / t的HTCT剂量下，获得79.23％的可燃物，灰分为9.99％。增强氧化煤分离的主要原因是，随着HTCT在氧化煤上的吸附，C–O亲水性官能团被覆盖，氧化煤表面增加了数量的C–C / C–H疏水性官能团，从而改善了表面疏水性和浮选性氧化的煤。这项研究为煤焦油的再利用和氧化煤的浮选升级提供了有价值的指导。