神东低阶煤浮选前后表面性质的表征研究

Research on characterization of surface properities of Shendong low rank coal before and after flotation

为了分析浮选前后神东低阶煤表面矿物组成、赋存形态及表面官能团的变化,采用X-射线衍射(XRD)、扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)等表面分析方法对浮选前后样品的表面性质进行了表征分析。结果表明,原煤中存在的矿物质为石英石、高岭石、白云母、斜绿泥石、蒙脱石和黄铁矿等,浮选精煤中残留的矿物质主要是石英石和高岭石;原煤表面粗糙并存在裂隙和凹陷,附着有大量的微细煤粒和异质细泥,精煤表面较为平整且附着有少量的微细颗粒,尾煤表面粘附有较多的微细粒层状或片状的矿物质;煤粒表面的含氧官能团以羟基(-OH)和羰基(C=O)为主,主要在精煤表面赋存,成灰矿物质多存在于尾煤表面。

In order to analysis the changes of surface mineral composition,occurrence and functional groups of Shendong low rank coal before and after flotation,the surface properities of the samples have been analyzed by X-ray diffraction,Scanning Electron Microscope and Fourier Transform Infrared Spectroscopy.The results indicated that the minerals presented in raw coal were quartz,kaolinite,muscovite,clinochlore,montmorillonite and pyrite.The residual miner-als in concentrate were quartz and kaolinite.With the presence of fissure and hollow,the surface of raw coal was crude and associated with lots of fine coals and tiny slimes.The surface of concen-trate was smooth and associated with little fine particles.However,there were numerous fine laminar or schistous minerals attached to the surface of tailing.The major oxygen-containing functional groups of raw coal were hydroxyl （- OH）and carbonyl （C= O）,which also mainly presented on the surface of concentrate.The ash-forming minerals were presented on the surface of tailing.