Study on properties and application of coal seam composite water injection materials under inorganic salt coordination
Coal dust pollution is one of the factors threatening mine safety in the process of coal mining.Coal seam water injection technology is widely used in coal mine because it can increase the water con-tent of coal seam by entering the fissure and pore structure of coal body through solution,and can ef-fectively restrain the generation of coal dust.Based on water injection technology,water injection ma-terials were explored,and the best inorganic salt composite solution(0.4％SDBS solution and 0.3 mol/L NaCl solution)was selected by using contact angle and surface tension tests.Laser particle size analysis and spontaneous imbibition experiments at four particle size levels of 0.450～＞0.300,0.300～＞0.200,0.200～＞0.150,0.150～0.125 mm were carried out to explore the wettability effects of different particles and field experimental verification.The results showed that the coal dust particles with different particle size intervals had similar surface characteristics and adsorption capacity.The total dust removal rates of the three mining processes in the coal winning machine oper-ation site,transport process and loading process were 69.68％,80.71％and 79.35％.The dust removal rates of respirable dust were 74.45％,73.47％and 69.95％.The research results could provide theoretical basis for coal seam dust removal by water injection.
coal dustsurfactantcoal seam water injectionwettabilitysurface tension
万方数据
维普
