机械力改性强化煤系高岭土电选脱碳试验研究  

Experimental study on mechanical modification to enhance the decarburizationof coal-series kaolin by triboelectric separation

作　　者：贺靖峰[1,2] 戴永平 郭成静 白强 朱凌涛 杨斌 HE Jingfeng;DAI Yongping;GUO Chengjing;BAI Qiang;ZHU Lingtao;YANG Bin(Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《煤炭学报》2023年第2期1006-1016,共11页Journal of China Coal Society

基　　金：国家自然科学基金面上资助项目(52074289);江苏省基础研究计划自然科学基金资助项目(BK20220090)。

摘　　要：煤系高岭土的高效脱碳提质是后续深加工利用的前提和保障。通过红外光谱(FTIR)、X射线光电子能谱(XPS)以及荷质比测试探究了机械力改性对煤系高岭土不同组分颗粒(高岭石和净煤)表面元素组成、官能团以及荷电性能的影响。在此基础上,采用旋转摩擦电选试验研究了机械力改性对煤系高岭土脱碳效果的影响。研究结果表明:机械力改性能够改变高岭石和净煤颗粒表面元素以及官能团,引起高岭石和净煤颗粒表面荷电性能的变化。机械力改性能够使高岭石和净煤表面C—C基团含量升高、C—O基团含量降低、C=O基团或—COOH基团含量升高,强化了高岭石和净煤颗粒的摩擦荷电性能差异。机械力改性后,高岭石中Al和Si元素含量的减小,增加了其表面负电荷;净煤中C、Al和Si元素含量的增加以及O元素含量的减少,增加了其表面正电荷。随着机械力改性时间的增加,高岭石和净煤颗粒表面的荷质比呈现先减小后趋于稳定的趋势。当机械力改性时间为40 s时,高岭石与净煤颗粒具有较强的荷电能力,其中0.074~0.125 mm和0.125~0.250 mm净煤的荷质比分别为12.88 nC/g和13.16 nC/g,高岭石的荷质比为-5.41 nC/g,两者荷质比差值较大且稳定,有利于煤系高岭土的摩擦电选脱碳。在最佳试验条件下,经机械力改性后,0.074~0.125 mm与0.125~0.250 mm煤系高岭土脱碳效率分别为41.35%和37.17%,精矿产率分别为72.92%和77.05%,有用组分回收率分别达到82.27%和83.99%,实现了煤系高岭土的高效脱碳预富集。The efficient decarbonization and quality improvement of coal-series kaolin is the premise and guarantee for subsequent deep processing and utilization.The influence of mechanical modification on the surface elemental composition,functional groups,and charging performance of different component particles(kaolinite and clean coal)in coal-series kaolin was studied by Fourier transform infrared spectrum(FTIR),X-ray photoelectron spectroscopy(XPS),and charge-to-mass ratio tests.The effect of mechanical modification on the decarbonization performance of coal-series kaolin was also investigated using rotary triboelectric separation tests.The research results show that the mechanical modification could change the elements and functional groups on the surface of kaolinite and clean coal particles,which caused the changes in the surface charge properties of kaolinite and clean coal particles.The mechanical modification resulted in an increase in the content of C—C groups,a decrease in the content of C—O groups,and an increase in the content of C O groups or—COOH groups for the surface of kaolinite and clean coal particles,which enhanced the tribo-charge performance of kaolinite and clean coal particles.After the mechanical modification,the decrease in the content of Al and Si elements on the surface of kaolinite increased its negative charge;the increase in the content of C,Al and Si elements and the decrease in content of O element on the surface of clean coal increased its positive charge.With the increase of mechanical modification time,the charge-to-mass ratios on the surface of kaolinite and clean coal particles showed a trend of first decreasing and then stabilizing.When the mechanical modification time was 40 s,the kaolinite and clean coal particles had strong charge ability,i.e.,the charge-to-mass ratio of 0.074-0.125 mm and 0.125-0.250 mm clean coal was 12.88 nC/g and 13.16 nC/g,respectively,and that of kaolinite was-5.41 nC/g.The difference in charge-to-mass ratios between kaolinite and clean coal was larg

关 键 词：摩擦电选 煤系高岭石 机械力改性 荷质比 脱碳性能 

分 类 号：TD92[矿业工程—选矿]