The problem of low-rank coal flotation continues to be a challenge due to the poor hydrophobicity and abundant oxygenated functional groups on particle surfaces. In this study, carrier flotation was used to improve the flotation performance of low-rank coal with polystyrene as a carrier material. Kerosene was used as a collector and played a role in the adhesion of fine low-rank coal to polystyrene due to its hydrophobic properties. The carrier feature of polystyrene was demonstrated by Turbiscan Lab Expert stability analysis and scanning electron microscopy analysis. The flotation experiments revealed that the optimum conditions were: collector dosage 5000 g/t, pulp concentration 40 g/L, and the ratio of low-rank coal to polystyrene 100:10. Under these conditions, the combustible recovery by carrier flotation was obtained as 70.59% when the ash content was 12.32%, which increased by 25.68 points compared with the combustible recovery of conventional flotation under almost the same ash content. The fine coal particles coated the coarse polystyrene particles through hydrophobic interactions between the polystyrene and hydrocarbon chains of the kerosene adsorbed on coal particles. The results suggested that the flotation performance of low-rank coal was significantly improved by carrier flotation with polystyrene, especially for fine particles.

中文翻译：

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低阶煤与聚苯乙烯的浮选

由于颗粒表面疏水性差和氧化官能团丰富，低阶煤浮选问题仍然是一个挑战。在这项研究中，使用载体浮选法以聚苯乙烯为载体材料改善低阶煤的浮选性能。煤油被用作捕收剂，并由于其疏水性而在细低级煤与聚苯乙烯的粘附中发挥了作用。Turbiscan Lab Expert稳定性分析和扫描电子显微镜分析证明了聚苯乙烯的载体特征。浮选实验表明，最佳条件为：捕收剂用量5000 g / t，纸浆浓度40 g / L，低级煤与聚苯乙烯之比为100：10。在这些条件下，通过浮选得到的可燃物回收率为70。灰分为12.32％时为59％，与几乎相同灰分下常规浮选的可燃回收率相比提高了25.68点。细煤颗粒通过聚苯乙烯与煤颗粒上吸附的煤油的烃链之间的疏水相互作用，覆盖了粗聚苯乙烯颗粒。结果表明，聚苯乙烯进行载体浮选可显着改善低阶煤的浮选性能，特别是对于细颗粒。