Pore Stucture Action Mechanism Based on Electrochemistry Inhibiting Coal Series Cray Rock Sliming
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摘要:
为解决黏土岩在煤炭洗选过程易泥化的问题，采用低温液氮吸附法，考察了不同电解质浓度条件下煤系黏土岩孔隙结构的变化规律，分析了煤系黏土岩孔隙结构特征变化与泥化的关联，揭示了电化学抑制煤系黏土岩泥化的结构作用机制。试验结果表明，电化学作用可以改变黏土岩的孔隙类型，显著降低黏土岩的比表面积、孔体积、孔隙分形分维数，减少黏土岩微孔比例，提高其平均孔径。这些变化使煤系黏土岩孔隙水化性能减弱，导致其泥化进程被有效抑制。
Abstract:In order to solve the problem of easy sliming of coal series cray rock in the process of coal processing, the change law of pore structure of coal series clay rock under different electrolyte concentration was investigated by low temperature liquid nitrogen adsorption method. The relationship between the pore structure characteristic of coal series clay rock and its sliming was analyzed, and the structural mechanism of electrochemical inhibition of coal series clay rock sliming was revealed. The results show that electrochemistry can change the pore type of clay rock, and significantly reduce specific surface area, pore volume and pore fractal dimension of clay rock. It can also reduce micropore ratio of clay rock, and can increase its average particle size. The change of pore structure characteristic of clay rock would weaken their hydration properties, which would cause the sliming process of clay rock to be effectively inhibited.
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Key words:
- electrochemical action /
- coal series cray rock /
- sliming /
- pore structure
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表 1 不同电解质浓度下煤系黏土岩的孔隙分形
Table 1. Pore fractal of processed coal series clay rock under different electrolyte concentration
Electrolyte concentration/(mol·L-1) 0 0.1 0.5 1.0 1.5 2.0 Pore fractal dimension of clay rock 2.6913 2.6853 2.6533 2.4504 2.437 2.4270 Correlation coefficient 0.99803 0.99908 0.99951 0.99706 0.99703 0.99579 
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