Study On Dynamic Behavior Of Gangue Pollutants Transport Coupled Flow And Temperature

Aiming at the key scientific issues of monitoring the process of pollution at coal mining area, a series of indoor model test which is mainly depends on the way of variable temperature and static soak has been carried out by coupling flow and temperature. With seepage mechanics, hydrogeology, geochemistry, environmental science, thermodynamics and interdisciplinary research methods, gangue waste transport mechanism of pollutant release coupling flow and temperature has been revealed through quantitative of the pollutants concentration and waste rock samples surface characteristics. The study provided the theoretical basis and technical support for the spontaneous combustion of coal gangue and pollution control and treatment and utilization of coal resources. The main research results are as follows:(1) Chemical composition of the coal gangue which contained various weathering degree has been analyzed through X-ray diffraction measurement. The results show that the coal gangue of different area contained different activation components which can increase the hazard to the environment. Higher levels of activation components of the waste rock samples have been taken static immersion test at various days, different pH values and different temperatures. The results show that the coal gangues have acidic property, and the concentration with the pH value and temperature changes more apparent.(2) The coal gangue SEM analysis of microstructure have been carried out, The results show that the micro-surface of coal gangue in acidic environment showed more serious structural damage and more large pores changes. The gray value of SEM image has been studied and calculated and quantified the changes in the pore. The gray value of SEM image has been studied and calculated and quantified the changes in the pore. Results from the quantitative analysis accorded to the test conditions. (3) Fit the curve of iron concentration curve, the results show that the concentration change over time is similar to the exponential function. Fitting over the course of R are 0.985. In the circumstances of exponential function as a boundary condition numerical calculation coupling by flow and temperature has been performed. The results showed that the diffusion of pollutants in the process of transmission has been impacted by temperature, what included both concentration of the initial boundary and diffusion rate. Diffusion concentration of 10 days, 80℃is about1.7 times to 10 days, 20℃; 30 days under the same conditions is about 2.15 times.