Study on the effect of NMR-based surfactants on pore wetting of high-order coal
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摘要:
高阶煤微小孔发育但具有弱吸水性的特征。从微小孔隙角度出发研究不同类型表面活性剂对高阶煤润湿性的改善效果，对高阶煤防尘降尘具有重要意义。以山西赵庄矿、贵州糯东矿高阶煤为研究对象，利用低场核磁共振测定系统（LNMR），开展煤样沉降试验、煤样−溶液渗吸孔隙水分布测定试验，分析表面活性剂溶液在不同复配比例条件下对高阶煤样的微小孔隙润湿性改善规律。结果表明：8种表面活性剂单体溶液沉降中，煤样在表面活性剂溶液中的沉降速率随着质量分数的增加逐步增加，在质量分数0.5%时各溶液的煤样沉降速率趋于平衡，其中曲拉通X-100（X-100）、脂肪醇聚氧乙烯醚（JFC-U）和十二烷基苯磺酸钠（SDBS）的沉降效果较其他表面活性剂溶液要快。基于低场核磁共振试验T2谱煤样润湿双定量评价方法，研究发现3种优选的表面活性剂溶液在质量分数均为0.5%的条件下，采取体积比为1∶1、1∶2、2∶1的复配方式时，复配溶液对高阶煤微小孔隙润湿性均起到了协同增效作用，且复配表面活性剂溶液的润湿改善效果均高于表面活性剂单体溶液；非离子表面活性剂JFC-U溶液与阴离子表面活性剂SDBS溶液进行体积比为2∶1复配时对于改善高阶煤润湿的效果较为明显；非离子型与非离子型表面活性剂的复配溶液中，复配表面活性剂溶液对煤样的润湿改善效果与JFC-U的含量呈正相关。研究结果可为煤矿湿式防尘时表面活性剂类型的选取以及煤样润湿性的研究方法提供参考。
Abstract:High-order coal has the characteristics of weak water absorption due to the development of micropores. From the perspective of micropores, it is of great significance to study the improvement effect of different types of surfactants on the wettability of high-end coal, which is of great significance for dust prevention and dust reduction of high-end coal. Taking the high-order coal of Zhaozhuang Mine in Shanxi Province and Nuodong Mine in Guizhou as the research object, the low-field nuclear magnetic resonance (LNMR) measurement system was used to carry out the coal sample sedimentation experiment and the coal sample-solution permeation pore water distribution determination experiment, and analyze the improvement law of micropore wettability of surfactant solution on high-order coal samples under different compound ratios. The results show that: In the sedimentation of eight surfactant monomer solutions, the sedimentation rate of coal samples in surfactant solution gradually increased with the increase of mass fraction, and the sedimentation rate of coal samples in each solution tended to balance at 0.5% mass fraction, among which the sedimentation effect of Trolatong X-100 (X-100), fatty alcohol polyoxyethylene ether (JFC-U) and sodium dodecyl benzene sulfonate (SDBS) was faster than that of other surfactant solutions. Based on the low-field NMR experiment T2 spectroscopy, a dual quantitative evaluation method was established, and it was found that when the three preferred surfactant solutions were compounded with volume ratios of 1∶1, 1∶2 and 2∶1 under the condition that the mass fraction was 0.5%, the compound solution played a synergistic role in the wettability of the micropores of high-order coal, and the wetting improvement effect of the compound surfactant solution was higher than that of the surfactant monomer solution. When the volume ratio of the nonionic surfactant JFC-U solution and the anionic surfactant SDBS solution were compounded 2∶1, the effect on improving the wetting of high-order coal was obvious. In the compound solution of nonionic and nonionic surfactants, the wetting improvement effect of compound surfactant solution on coal samples was positively correlated with the content of JFC-U. The research results can provide a reference for the selection of surfactant types and the research methods of coal sample wettability during wet dust control in coal mines.
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Keywords:
- high-grade coal /
- pore wetting /
- nuclear magnetic resonance /
- surfactant /
- tiny holes
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图 1 不同表面活性剂对GZ煤样的沉降速率变化
Figure 1. Changes in sedimentation rate of GZ coal samples by different surfactants
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图 2 不同表面活性剂对ZZ煤样的沉降速率变化
Figure 2. Changes in sedimentation rate of ZZ coal samples by different surfactants
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图 4 75～80 μm GZ及ZZ煤样蒸馏水渗吸T2谱
Figure 4. 75−80 μm GZ and ZZ coal-like distilled water osmotic T2 spectra
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图 5 75～80 μm GZ、ZZ煤样表面活性剂单体溶液渗吸T2谱
Figure 5. 75−80 μm GZ, ZZ coal sample surfactant monomer solution osmosis T2 spectrum
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图 6 75～80 μm GZ煤表面活性剂复配渗吸T2谱
Figure 6. 75−80 μm GZ coal surfactant compound osption T2 spectrum
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图 7 75～80 μm ZZ煤表面活性剂渗吸T2谱
Figure 7. 75−80 μm GZ coal surfactant compound osption T2 spectrum
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图 8 不同表面活性剂复配溶液作用下ZZ及GZ微小孔的润湿率变化
Figure 8. Changes in wetting rate of ZZ and GZ micropores under the effect of different surfactant compound solutions
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图 9 表面活性剂作用下GZ、ZZ的孔隙水流动速率
Figure 9. Pore water flow rate of GZ and ZZ under the effect of surfactant
表 1 煤样基本参数测定结果
Table 1 Results of determination of basic parameters of coal sample
煤样 工业分析 最大镜质组反射率/% 接触角/（°） Mad/% Aad/% Vdaf/% FCad/% GZ 0.65 10.25 10.40 79.83 2.89 75.8 ZZ 0.77 11.85 13.37 75.7 2.21 71.2 
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表 2 试验所用的表面活性剂
Table 2 Surfactants used in experiment
表面活性剂 代号 类型 曲拉通X-100 X-100 非离子型 脂肪醇聚氧乙烯醚 JFC-U 非离子型 椰子油脂肪酸二乙醇酰胺 CDEA 非离子型 烷基糖苷 APG 非离子型 十二烷基苯磺酸钠 SDBS 阴离子型 十二烷基硫酸钠 SDS 阴离子型 仲烷基磺酸钠 SAS-60 阴离子型 脂肪醇聚氧乙烯醚硫酸钠 AES 阴离子型
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