Numerical Simulation Study On Dissolved-releasc-migration Rules Of Chemical Composition In Coal Gangue Hill

Under the action of natural precipitation in long times, Coal Gangue LeachingSolution of mining has a great affect on groundwater environment. Variouschemical reaction happen internal Coal gangue and large amounts of heat release,which cause uneven temperature distribution in the coal gangue. Under the action ofseepage, moisture content is different, affected by above two factors, dissolved-release-migration of chemical fractions show different patterns in the coal gangue.Firstly release of chemical component in the Coal Gangue is simulated withPHREEQC software. Obtain change rules of the effect of temperature and moistureratio on chemical component concentration. Thereby obtain the relationship of ionrelease rate of chemical components, moisture content and chemical componentconcentration. Which provides basis of the chemical component release-migration ofcoal gangue. Release-migration rule of internal components is obtained under thetemperature field, seepage field, concentration field with reuse of multi-physicalcoupling field with COMSOL Multiphysics software.The conclusions are as follows:①Carbonate dissolution by the partial pressure of CO₂effects are stronger in thesilicate; the silicate mineral dissolution rate with temperature and CO₂partial pressureincreases;②The most direct factor of effecting the release rate of coal gangue dumpchemical components is the concentration of ions in solution rather than change oftime, establish the nonlinear equation of ion release rate and ion concentration. Ionrelease pattern is more scientific;③Effected by the rain leaching and seepage, Mg2+、Al3+、 Na⁺、 K⁺four ionsin coal gangue enrich on the sunny; while Ca2+ions in coal gangue back yang side;④The coal gangue release faster by affect of rain leaching the internalcomponents, slow later period, ion enrichment zone form gradually hill bottombecause of seepage in waste;⑤Various emission of chemical fractions in the coal gangue increase because ofrainwater infiltration, increase of temperature is caused by coal gangue internalchemical reaction and the long time of sunlight. Thus increase the Mg2+、Al3+、Na⁺、K⁺four ion emission.