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Appl. Sci. 2017, 7(3), 300; doi:10.3390/app7030300

Experimental Study of Imbibition Characteristics of Silica Sol in Coal-Measure Mudstone Matrix

1
Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China
2
Department of Energy and Mineral Engineering, G3 Center and Energy Institute, Pennsylvania State University, University Park, PA 16802, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Lacidogna
Received: 28 December 2016 / Revised: 27 February 2017 / Accepted: 16 March 2017 / Published: 20 March 2017
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Abstract

Coal-measure mudstone is a typical dual-porosity media, and grouting in a matrix system is dominantly controlled by the imbibition effect for silica sol. This paper studies the imbibition effect using mudstone in the Huaibei mining area and silica sol as grouting material as an example. Groutability, driving force, and diffusion difficulty affecting the imbibition effect were tested by a mercury porosimeter, nanoparticle size analyzer, optical contact-angle measuring device, surface tension meter, and rotary viscosity meter. After finely grinding a mudstone sample, a pressureless imbibition process was conducted through nuclear magnetic resonance equipment for 216 h to study colloid spontaneous migration and phase characteristics. Results show that silica sol absorption rate follows a power function and that the spectrograms of T2 are distributed in a triple peak pattern, with a tendency to move to the right of vertex time. The paper lays a theoretical and experimental foundation for field grouting in the coal mine. View Full-Text
Keywords: imbibition effect; silica sol; coal-measure mudstone imbibition effect; silica sol; coal-measure mudstone
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Pan, D.; Zhang, N.; Han, C.; Yang, S.; Zhang, C.; Xie, Z. Experimental Study of Imbibition Characteristics of Silica Sol in Coal-Measure Mudstone Matrix. Appl. Sci. 2017, 7, 300.

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