Yin Qinglin, Wang Man, Liao Xiangguo, Liu Guangshan, Yang Haichang
State Key Laboratory of Coking Coal Resources Green Exploitation, Pingdingshan 467000, Henan, China.
Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
ACS Omega. 2025 Apr 22;10(17):17143-17151. doi: 10.1021/acsomega.4c06686. eCollection 2025 May 6.
Fluidized-bed flotation can realize effective recovery of coarse minerals. In this study, 1-2 mm lignite was used as the experimental material. First, the interaction between the particle and bubble was investigated to reveal the mechanism of fluidized-bed flotation. The rising water flow makes the particle settling velocity decrease, leading to an increase in the particle-bubble contact time. The application of methyl oleate as a collector for coal leads to a significant reduction in the induction time and an increase in the critical detachment force. Both these conditions contribute to the formation of particle-bubble aggregation, indicating that the decrease in settling velocity and the enhancement of hydrophobicity are significant for the recovery of coarse coal. Subsequently, a comparative analysis of separation efficiency between column flotation and fluidized-bed flotation was performed alongside an investigation into the optimal parameters of fluidized-bed flotation. The clean coal yield of fluidized-bed flotation is more than 30%, while that of column flotation is less than 10%. The combination of fluidized-bed flotation and a methyl oleate collector demonstrates a capacity for efficient recovery of coarse coal particles. When the methyl oleate dosage is 2000 g/t and the superficial water velocity is 87 mm/s, the fluidized-bed flotation achieves the optimum separation effect, with a clean coal yield of 32.71% and an ash content of 9.89%.
流化床浮选能够实现粗粒矿物的有效回收。在本研究中，使用1 - 2毫米的褐煤作为实验材料。首先，研究了颗粒与气泡之间的相互作用，以揭示流化床浮选的机理。上升的水流使颗粒沉降速度降低，导致颗粒与气泡的接触时间增加。使用油酸甲酯作为煤的捕收剂会显著缩短诱导时间并增加临界脱离力。这两个条件都有助于颗粒 - 气泡聚集体的形成，表明沉降速度的降低和疏水性的增强对粗煤的回收具有重要意义。随后，对柱式浮选和流化床浮选的分离效率进行了对比分析，并研究了流化床浮选的最佳参数。流化床浮选的精煤产率超过30%，而柱式浮选的精煤产率低于10%。流化床浮选与油酸甲酯捕收剂的组合显示出高效回收粗煤颗粒的能力。当油酸甲酯用量为2000克/吨且表观水速为87毫米/秒时，流化床浮选达到最佳分离效果，精煤产率为32.71%，灰分为9.89%。
