Abstract Flotation reagents in particular the flotation collector plays a significant role in the cleaning efficiency of coal slimes in the coal preparation and utilization industry. A new collector (NC) was used to achieve the efficient cleaning of coal slimes. Comparing with the conventional flotation collector of diesel oil (DO), the higher yields and lower ash contents of clean coal with the higher combustible material recoveries could be obtained using the NC in flotation. The optimum NC dosage of 500 g/t was acquired through the unit flotation tests. Fourier transform infrared spectroscopy (FTIR) and contact angle measurement were used to study the interaction mechanism between the flotation collector and coal surface. The results indicated that the stronger electron-attracting ability of the ester groups than that of the carbon-carbon double bond resulted in the more stable interaction between the NC and coal surface than that between the DO and coal surface. The contact angle of the coal slime wetting with the NC of 67.1° was larger than that with the DO of 62.6°, suggesting the stronger hydrophobicity of the coal slime with the NC than that with the DO. The chemical composition analysis results suggest that the NC belongs to a compound flotation reagent, which provides an alternative high-efficient collector for coal flotation industry.

中文翻译：

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新型复合捕收剂对煤泥的浮选强化及药剂与煤面的相互作用机理

摘要 浮选药剂特别是浮选捕收剂在选煤和利用行业对煤泥的净化效率起着重要的作用。一种新型收集器（NC）用于实现煤泥的高效清洁。与传统的柴油（DO）浮选捕收剂相比，在浮选中使用NC可以获得更高的精煤收率和更低的灰分以及更高的可燃物回收率。通过单位浮选试验获得了最佳NC用量为500 g/t。傅里叶变换红外光谱（FTIR）和接触角测量被用来研究浮选捕收剂与煤表面的相互作用机制。结果表明，酯基团的吸电子能力强于碳碳双键，导致NC与煤表面的相互作用比DO与煤表面的相互作用更稳定。煤泥与 NC 润湿的接触角为 67.1°，大于 DO 的 62.6°，表明煤泥与 NC 的疏水性强于与 DO 的疏水性。化学成分分析结果表明，NC属于复合浮选药剂，为煤浮选行业提供了一种替代的高效捕收剂。6°，表明含 NC 的煤泥比含 DO 的煤泥疏水性更强。化学成分分析结果表明，NC属于复合浮选药剂，为煤浮选行业提供了一种替代的高效捕收剂。6°，表明含 NC 的煤泥比含 DO 的煤泥疏水性更强。化学成分分析结果表明，NC属于复合浮选药剂，为煤浮选行业提供了一种替代的高效捕收剂。