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Change Mechanism in Surface Properties of Treated Tectonic Coal by Different Acids

ZHANG Xiaodong;YU Kunkun;ZHANG Shuo;DU Zhigang;School of Energy Science and Engineering,He'nan Polytechnic University;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region;  
The coal samples with different deformed degrees,collected from Huoerxinhe coalmine in Qinshui coal basin were treated by the different acids,including hydrochloric acid(HCl),acetic acid(HAc)and hydrofluoric acid(HF).Mass change rate and coal-water contact angel were measured,and the surface tension was calculated by low temperature ashing and X-ray diffraction methods.The results show that the mass change rate of the coal is about 0.1% by HCl or HAc treatment,while the mass change rate of the coal is 7% by HF treatment;the reaction objects are different for each acid,most of the minerals in the coal can react with HF,which is the most effective treatment method;after HCl treatment,the coal-water contact angel shows a obviously decreasing trend from 59.75°to 33.25°,but the surface tension increases from54.42mJ/m~2 to 66.45mJ/m~2 to cause a stronger wettability.After HAc and HF treatment,the coal-water contact angel shows a correspondingly increasing phenomenon from 59.75°to 85.00°and 84.50°,the surface tension decreases from 54.42mJ/m~2 to 39.34mJ/m~2 and 39.65mJ/m~2 respectively.In general,the water-coal contact angel and surface tension of coal change significantly after the acid treatment.
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