WANG Fangfang，ZHANG Xiaodong，LIU Xiao，et al. Effect of acidification treatment on the extraction performance of coking coal[J]. Coal Science and Technology，2022，50（12）：262−270
. DOI: 10.13199/j.cnki.cst.2021-0538| Citation: |
WANG Fangfang，ZHANG Xiaodong，LIU Xiao，et al. Effect of acidification treatment on the extraction performance of coking coal[J]. Coal Science and Technology，2022，50（12）：262−270 . DOI: 10.13199/j.cnki.cst.2021-0538
|
In order to study the influence mechanism of minerals removal from coal on solvent extraction behavior, different concentrations of tetrahydrofuran (THF) solvents were used to extract coking coal before and after acidification with hydrochloric acid (HCl) and hydrofluoric acid (HF). With the help of conventional coal quality analysis and GC-MS test methods, the differences of THF extraction rate and extract composition before and after demineralization of coal samples were analyzed, and the influence mechanism of solvent concentration, extraction time, temperature and minerals was discussed. The results show that: ①After acidification, the ash yield of coal sample reaches 97.3%, the content decreases significantly, the fixed carbon content increases by 21%, the volatile content increases relatively, but the moisture content remains basically unchanged; The contents of C and H decrease, while the contents of O, N and S increase, among which the contents of C and O change significantly. ②The extraction rate of coal samples after acidification increase significantly, but with the increase of THF concentration, the increase of extraction rate show a decreasing trend. The same extraction effect is achieved under the same conditions, and the extraction time of acidified coal is 1.25~5 times faster than that of raw coal; Acidification treatment enlarges the effect of temperature on extraction rate, which makes the extraction advantage at 35 ℃ more obvious. ③The relative content of heteroatom compounds in raw coal extracts is the highest, while aliphatic hydrocarbons are the main components in acidified coal extracts, among which the content of straight chain hydrocarbons increases with the increase of THF concentration, accounting for 91.92% of the total content. The number of carbon atoms is mainly concentrated in C15~C22, but the number of extracted species is significantly less than that of raw coal. Generally speaking, acidification treatment can effectively improve the extraction capacity of THF, greatly shorten the extraction time, and improve the extraction capacity of high carbon alkanes in coal. In addition, although water does not dominate the extraction process, it will also affect the extraction ability of THF to a certain extent, making the extraction ability of low concentration THF solvent better than that of pure THF solvent.
| [1] |
张小东, 郝宗超, 张 硕, 等. 溶剂改造下构造煤纳米级孔隙的差异性变化及机理[J]. 中国矿业大学报, 2017, 46(1): 148-154.
ZHANG Xiaodong, HAO Zongchao, ZHANG Shuo, et al. Differential changes and mechanism of nanoscale pores of structural coal under solvent modification[J]. Journal of China University of Mining & Technology, 2017, 46(1): 148-154.
|
| [2] |
胡如男,王知彩,李 磊,等. 溶剂萃取预处理对低阶煤大分子结构的影响[J]. 燃料化学学报,2018,46(7):778−786. doi: 10.1016/S1872-5813(18)30034-3
HU Runan,WANG Zhicai,LI Lei,et al. Effect of solvent extraction pretreatment on macromolecular structure of low-rank coal[J]. Journal of Fuel Chemistry and Technology,2018,46(7):778−786. doi: 10.1016/S1872-5813(18)30034-3
|
| [3] |
季淮君,李增华,彭英健,等. 煤的溶剂萃取物成分及对煤吸附甲烷特性影响[J]. 煤炭学报,2015,40(4):856−862.
JI Huaijun,LI Zenghua,PENG Yingjian,et al. Composition of coal solvent extract and its influence on methane adsorption characteristics of coal[J]. Journal of China Coal Society,2015,40(4):856−862.
|
| [4] |
XING Fan,JING Jiang,LU Chen,et al. Identification of organic fluorides and distribution of organic species in an anthracite with high content of fluorine[J]. Fuel Processing Technology,2016,142:54−58. doi: 10.1016/j.fuproc.2015.09.024
|
| [5] |
SONG Yao,ZOU Quanle,SU Erlei,et al. Changes in themicrostructure of low-rank coal after supercritical CO2 and water treatment[J]. Fuel,2020,279(1):1−13.
|
| [6] |
RUBICRA F,ARENILLAS A,PEVIDA C,et al. Influence of acid treatment on the properties of pulverized coals with low ash content[J]. Journal of Engineering Thermophysics,2009,30(4):699−702.
|
| [7] |
郝宗超,张小东,杨燕青,等. 不同煤级煤四氢呋喃阶段萃取物的化学组成与动力学机制[J]. 煤炭学报,2018,43(10):2903−2910.
HAO Zongchao,ZHANG Xiaodong,YANG Yanqing,et al. Chemical composition and kinetic mechanism of tetrahydrofuran extracts from different coal ranks[J]. Journal of China Coal Society,2018,43(10):2903−2910.
|
| [8] |
ZHANG Shuo, ZHANG Xiaodong, HAO Zongchao, et al. Dissolution behavior and chemical characteristics of low molecular weight compounds from tectonically deformed coal under tetrahydrofuran extraction[J]. Fuel, 257(2019)116030.
|
| [9] |
胡光洲,石欣欣,甄会丽,等. 富蜡褐煤化学脱灰及其对萃取的影响[J]. 中国矿业大学学报,2012,41(3):446−451.
HU Guangzhou,SHI Xinxin,ZHEN Huili,et al. Chemical Deashing of wax-rich lignite and its influence on extraction[J]. Journal of China University of Mining & Technology,2012,41(3):446−451.
|
| [10] |
张 薇,宋 强,张 帆,等. 酸洗脱除矿物对煤化学组成及润湿性的影响[J]. 煤炭转化,2019,42(3):1−9.
ZHANG Wei,SONG Qiang,ZHANG Fan,et al. Effect of acid elution on chemical composition and wettability of coal[J]. Coal Conversion,2019,42(3):1−9.
|
| [11] |
马亚亚,马凤云,莫文龙,等. 酸化酸化处理对新疆和丰低阶煤结构和萃取性能的影响[J]. 燃料化学学报,2019,47(6):649−660.
MA Yaya,MA Fengyun,MO Wenlong,et al. Effect of acidification treatment on structure and extraction performance of Hefeng low-rank coal in Xinjiang[J]. Journal of Fuel Chemistry and Technology,2019,47(6):649−660.
|
| [12] |
LI,TAKNOHASHIT,LINO M,et al. Effect of acid treat ment on thermal extraction yield in ashless coal production[J]. Fuel,2004,83(6):727−732. doi: 10.1016/j.fuel.2003.06.002
|
| [13] |
LIU X P,WU X T,WANG J. Substantial upgrading of a high-ash lignite by hydrothermal treatment followed by Ca(OH)2 digestion/acid leaching[J]. Fuel,2018,222:269−277. doi: 10.1016/j.fuel.2018.02.034
|
| [14] |
LIU X Q, HE X, QIU N. X, et al. Molecular simulation of CH4, CO2, H2O and N2 molecules adsorption on heterogeneous surface models of coal[J]. Applied Surface Science, 2016, 389: 894-905.
|
| [15] |
葛 涛,张明旭,蔡川川. 汾西炼焦煤中含氧官能团分布特征[J]. 煤炭学报,2017,42(S2):500−504.
GE Tao,ZHANG Mingxu,CAI Chuanchuan. Distribution chara cteristics of oxygenated functional groups in Fenxi coking coal[J]. Journal of China Coal Society,2017,42(S2):500−504.
|
| [16] |
LI Pengpeng,ZHOU Shixin,ZAHANG Xiaodong,et al. Distributions and evolution model of water-soluble organic acids for coals with different thermal maturations[J]. Fuel,2021,283(1):118863.
|
| [17] |
LIANG Yunpei,TAN Youting,WANG Fakai,et al. Improving permeability of coal seams by freeze-fracturing method: The characterization of pore structure changes under low-field NMR[J]. Energy Reports,2020,6:550−561.
|
| [18] |
程晓茜,田继军,王海超,等. H2S水溶液对低阶煤孔隙结构影响的实验研究[J]. 煤炭学报,2020,45(4):1436−1444.
CHENG Xiaoqian,TIAN Jijun,WANG Haichao,et al. Experim ental study on the effect of H2S aqueous solution on pore structure of low rank coal[J]. Journal of China Coal Society,2020,45(4):1436−1444.
|
| [19] |
张祥成, 孟永彪, 马凤云, 等. 酸化处理对新疆和丰煤结构的影响[J]. 河南科技大学学报(自然科学版), 2019, 40(6): 89-94, 10.
ZHANG Xiangcheng, MENG Yongbiao, MA Fengyun, et al. Influence of acidification treatment on coal structure in He- feng, Xinjiang[J]. Journal of Henan University of Science and Technology(Natural Science Edition), 2019, 40(6): 89-94, 10.
|
| [20] |
WIJAYA N,ZHANG L. A critical review of coal deminera- ization and its implication on understanding the speciation forganically bound metals and submicrometer mineral grains in coal[J]. Energy Fuels,2011,25(11):1−16.
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: