疏水改性剂对浮选精煤脱水效果的影响试验及作用机理研究  

Study on dewatering experiment and mechanism of hydrophobic modifier on flotation cleaned coal

作　　者：牛新彬 年立营 朱光宇 杨晓鸿[1] 王伟涛 NIU Xin-bin;NIAN Li-ying;ZHU Guang-yu;YANG Xiao-hong;WANG Wei-tao(Huaibei Mining(Group)Co.,LTD.Linhuan Coal Preparation Plant,Huaibei,Anhui 235000,China;School of Materials Science and Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]淮北矿业(集团)有限责任公司临涣选煤厂,安徽淮北235000 [2]安徽理工大学材料科学与工程学院,安徽淮南232001

出　　处：《煤炭加工与综合利用》2023年第9期7-12,18,共7页Coal Processing & Comprehensive Utilization

基　　金：安徽理工大学2023研究生创新基金——结构型铁杂质对石英表面反应性的影响机制研究(2023cx2113)。

摘　　要：为了掌握疏水改性剂对浮选精煤的脱水效果及作用机理,试验研究了十二烷基三甲基氯化铵(1231)、十六烷基三甲基氯化铵(1631)和2种新型疏水改性剂(FH1和FH2)对浮选精煤脱水效果的影响,并通过接触角、傅里叶变换红外光谱仪(FTIR)以及X射线光电子能谱(XPS)分析药剂与浮选精煤的作用机理。结果表明,4种疏水改性剂的脱水效果依次为1631>1231>FH1>FH2;药剂的加入增加了煤样的接触角,增强了煤样的疏水性,接触角大小依次为1631>FH1>FH2,煤样的疏水性与脱水效果正相关;FTIR分析结果表明,药剂作用后没有新的吸收峰出现,原吸收峰的峰值明显增强,说明在煤样表面的官能团种类不变,但原先官能团含量增多,提高了精煤的脱水效果;药剂的加入使煤样表面的碳元素含量增多,氧元素含量降低,疏水改性药剂的端面与煤样表面的相互作用减弱,增强了煤样表面疏水性,有利于水分的排出。In order to understand the dewatering effect and mechanism of hydrophobic modifiers on flotation clean coal,the effects of dodecyltrimethylammonium chloride(1231),hexadecyltrimethylammonium chloride(1631),and two new hydrophobic modifiers(FH1 and FH2)on the dewatering performance of flotation clean coal were investigated through experimental studies.The mechanism of interaction between the modifiers and flotation clean coal was analyzed using contact angle measurements,Fourier-transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).The results showed that the dewatering performance of the four hydrophobic modifiers was in the following order:1631>1231>FH1>FH2.The addition of the modifiers increased the contact angles of the coal samples,indicating enhanced hydrophobicity.The contact angle values were in the order of 1631>FH1>FH2,and the hydrophobicity of the coal samples was positively correlated with the dewatering performance.FTIR analysis showed that there were no new absorption peaks after the treatment with the modifiers,but the intensities of the original absorption peaks were significantly enhanced.This indicated that the types of functional groups on the coal sample surface remained unchanged,but the content of the original functional groups increased,leading to improved dewatering performance of the clean coal.The addition of the modifiers increased the carbon content and decreased the oxygen content on the coal sample surface,weakening the interaction between the end groups of the hydrophobic modifiers and the coal sample surface.This enhanced the hydrophobicity of the coal sample surface and facilitated the removal of moisture.

关 键 词：疏水改性 浮选精煤 试验 脱水效果 机理研究 

分 类 号：TD943[矿业工程—选矿]