Abstract
ABSTRACTCoal mine dust may lead to coal miners’ pneumoconiosis and dust explosions, thus being seriously harmful to human beings. A wetting agent is commonly used to improve the efficiency of water infusion for mine dust control. Therefore, selecting an optimal wetting agent is crucial to this practice. This study measured surface tensions, contact angles, and capillary imbibitions of the wetting agents lauryl sodium sulfate (SDS), sodium dodecyl benzene sulfonate (LAS), sodium dioctyl sulfosuccinate (AOT), and SDS compounded with five additives on a coal-seam sample in the laboratory. Their wettability is comparatively investigated. Results indicate the following: (1) to select an optimal compound wetting agent, it is necessary to calculate a capillary force rising factor or to conduct capillary imbibition tests besides the measurements for surface tension and contact angle; (2) a compound wetting agent made of 0.10 wt% SDS + 0.05 wt% NaAc is optimal for the wettability enhancement of this coal. Its capillary force rising factor is 1.44 and its capillary imbibition rate is 2.96 times that of water without wetting agent. Field test results also confirmed that adding the optimal compound wetting agent into water infusion can significantly improve dust-prevention efficiency.
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