煤矸石内各矿物组分溶解-释放规律的数值模拟研究

为了更好防治煤矸石山对环境危害,研究了不同温度和CO2分压条件下煤矸石内各矿物的溶解-释放规律。应用美国地质调查所开发的水化学模拟软件PHREEQC对在不同温度和CO2分压条件下煤矸石内各矿物的溶解度进行了水化学模拟。研究结果显示,煤矸石内所有矿物溶解度都随着温度的上升而增大,然而随着溶液中CO2分压的不断增大这种趋势逐渐转变为随着温度的上升溶解度逐渐减小;煤矸石内所有矿物(石英除外)溶解度随着CO2分压的增大而增大。碳酸盐(方解石)的溶解度随着CO2分压升高呈现非线性迅速增大的趋势,其它盐类的溶解度随着CO2分压的升高增大的速率较为缓慢。在煤矸石山内部,某处煤矸石淋溶液内CO2分压越高,其化学组分浸出量也就越大;在矸石山透气性良好时,温度越高煤矸石化学成分的浸出量越大。 

The numerical simulation to the mineral dissolution-release law in the coal gangue

In order to better control the damage to environment by gangue, the mineral dissolution-release law of the coal gangue under different temperatures and CO2 partial pressure is researched. Hydro chemical simulation to the mineral dissolution-release law of the coal gangue under different temperatures and CO2 partial pressure is done in light of the software of PHREEQC developed by the United States Geological Survey. The results show that all of the coal gangue minerals solubility increases with temperature, however, with the increase of CO2 partial pressure the coal gangue minerals solubility gradually trend to decrease with the rise of temperature. Except for quartz, the solubility of all minerals in the coal gangue increases with the increase of CO2 partial pressure. The solubility of carbonate(calcite)increases rapidly in a nonlinear way with the increase of CO2 partial pressure, but other salts only increase slowly with CO2 partial pressure. In the coal gangue, the higher the concentration of the CO2 partical pressure in the solution, the higher the output of the gangue chemical components released. The higher the temperature, the higher the output of the chemical components released from the gangue under good air permeability.