Improving bubble-particle attachment during the flotation of low rank coal by surface modification
Improving bubble-particle attachment during the flotation of low rank coal by surface modification
复制标题
通过表面改性改善低阶煤浮选过程中的气泡-颗粒附着
DOI：
10.1016/j.ijmst.2019.04.001
复制
发表时间：
2020-03-01
影响因子：
11.8
通讯作者：
Tao, Xiuxiang
中科院分区：
文献类型：
--
作者：
Hu, Haishan;Li, Ming;Tao, Xiuxiang
针对低阶煤表面含氧官能团多、可浮性差等问题，采用扫描电镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）等技术对低阶煤的特性进行了系统分析。采用气泡-颗粒诱导时间表征气泡-颗粒附着，并对经酸、碱溶液浸泡改性后的低阶煤进行了气泡-颗粒附着分析。通过浮选试验验证了改性煤表面的可浮性。结果表明，粒径为0.125-0.074 mm的煤样具有较好的气泡-颗粒附着特性。气泡越小、气泡接近速度越大、气泡变形越大，越有助于增强气泡与颗粒的附着。对于酸性溶液，pH值越小，浸泡时间越长，煤样的可浮性越好，可燃物回收率越高。在pH = 0的酸性溶液中浸泡180 min，低阶煤可燃物回收率可达78.79%，而碱性溶液存在一个最佳浓度。(C)2019由Elsevier B. V.代表中国矿业大学出版。
Based on the problems caused by many oxygen-containing functional groups and poor floatability on the surface of low rank coal, the characteristics of low rank coal were analyzed systematically by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-Ray photoelectron spectroscopy (XPS) techniques. The bubble-particle induction time was used to determine the characterization of the bubble-particle attachment, and the bubble-particle attachment of low rank coal modified by soaking the coal samples in an acid or alkaline solution was analyzed. The floatability of the modified coal surface was verified by flotation tests. The results show that the particle size of 0.125-0.074 mm of the coal sample exhibited better bubble-particle attachment characteristics. The small bubble, the larger approach velocity of bubble and the larger bubble deformation were more helpful to enhance the bubble-particle attachment. For an acid solution, the smaller the pH was and the longer the soaking time was, the better the floatability of the coal sample and the higher the combustible material recovery were. The combustible material recovery of low rank coal was increased to 78.79% by soaking the sample in an acid solution of pH = 0 for 180 min. On the contrary there was a best concentration for the alkaline solution. (C) 2019 Published by Elsevier B.V. on behalf of China University of Mining & Technology.