Fenton酸化改性对无烟煤微细观结构影响实验研究  

Experimental study on the effects offenton acidification modification on the microstructure of anthracite

作　　者：杜双利 柴昊楠 赵洪宝[2] 张欢 李义涛 DU Shuangli;CHAI Haonan;ZHAO Hongbao;ZHANG Huan;LI Yitao(College of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Haidian,Beijing 100083,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西省太原市030024 [2]中国矿业大学(北京)能源与矿业学院,北京市海淀区100083 [3]太原理工大学矿业工程学院,山西省太原市030024

出　　处：《中国煤炭》2025年第2期158-172,共15页China Coal

基　　金：国家自然科学基金(52004170);山西省基础研究计划(202303021211071,202303021221008)。

摘　　要：Fenton试剂作为一种酸性氧化剂,具有绿色、环保、高效的特点。为探究其对无烟煤微细观结构的影响及其酸化改性机理,在同一酸性条件下,采用盐酸、醋酸、Fenton试剂对无烟煤进行改性处理。利用X射线衍射实验、傅里叶红外光谱变换实验以及低温氮气吸附实验等方法对处理前后煤样的微细观结构变化进行研究。结果表明,采用Fenton试剂处理后,煤样内部矿物含量降低,打开了被矿物堵塞的原生通道,芳香结构变得松散无序,煤样中微孔、中孔、大孔数量大幅增加,增孔效应和疏通扩孔效应显著,有利于甲烷的运移;煤样表面羟基含量大幅增加,脂肪烃含量明显降低,抑制了煤对甲烷的吸附能力。研究发现,Fenton试剂有较好的改性效果,醋酸的处理效果弱于Fenton试剂而强于盐酸,盐酸由于造成煤样中粘土矿物的膨胀,使得处理效果并不明显。Fenton reagent,as an acidic oxidant,has the characteristics of green,environmentally friendly,and highly efficient.To investigate its influence on the microstructure of anthracite and explore the acidification modification mechanism,comparative experiments were conducted under identical acidic conditions using hydrochloric acid(HCl),acetic acid(CH0x0E0xFF0xF00xFF偗b0x0FCOOH),and Fenton reagent for coal modification.The microstructural changes of the coal samples before and after treatment have been studied using X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),and low-temperature nitrogen adsorption(LTNA)tests.The results showed that after Fenton reagent treatment,the mineral content inside the coal samples decreased,opening up the native channels that blocked by minerals,and the aromatic structure became loose and disordered,which was conducive to methane diffusion.Meanwhile,the hydroxyl content on the coal sample surface increased obviously,while the aliphatic hydrocarbon content decreased noticeably,inhibiting the coal’s adsorption capacity for methane.In addition,the number of micropores,mesopores,and macropores in the coal sample increased evidently,with significant effects of pore enlargement and unblocking,which was instrumental to methane migration.The surface hydroxyl(-OH)content of the coal samples increased significantly,while the aliphatic hydrocarbon content decreased markedly,suppressing the coal’s methane adsorption capacity.The study found that Fenton reagent exhibited superior modification efficacy.The treatment effect of acetic acid was weaker than that of Fenton reagent but stronger than that of hydrochloric acid.Hydrochloric acid caused swelling of clay minerals in the coal samples,resulting in negligible improvement.

关 键 词：FENTON试剂 无烟煤 酸化改性 微细观结构 吸附研究 

分 类 号：TD849[矿业工程—煤矿开采]