溶液温度及CO2含量对长石溶解度的影响

为了研究温度对地下水溶液侵蚀长石的影响,应用地下水化学模拟软件Phreeqc对在不同CO2分压下,钙长石、钾长石、钠长石同时存在于溶液中和分别存在于溶液中的溶解度和温度的关系进行了水化学模拟。模拟结果表明:在3种长石同时存在于溶液中时,钙长石、钾长石的溶解度远小于单独存在时的溶解度,并且钠长石的溶解度远大于钙长石和钾长石的溶解度,钠长石的溶解度随着温度的升高而增大,钾长石的溶解度随温度的升高而增大的速率较为缓慢,钙长石的溶解度随着温度的升高迅速下降;在3种长石分别存在于溶液中时,3种长石的溶解度均随着温度的升高而增大。在3种长石分别存在于地下水溶液中时,地下水溶液的温度及CO2的含量越高对3种长石的侵蚀能力就越强;在3种长石同时存在于地下水溶液中时,温度的升高会降低地下水溶液对钾长石、钙长石的侵蚀能力,但依然会增强对钠长石的侵蚀能力。

Impact of temperature and CO2 in solution on feldspar solubility

In order to study the effect of temperature on underground water solution erosion feldspar, the paper applied groundwater chemical simulation software phreeqc to simulate the water chemistry relationship between solubility and temperature under different CO₂ partial pressure at the two situations that calcium feldspar, potash feldspar, sodium feldspar exist in solution at the same time or respectively. The simulation results show that the three kinds of feldspar present in solution at the same time.The solubility of calcium feldspar, potassium feldspar is far less than that of individual existence.The solubility of sodium feldspar is far more than that of calcium feldspar and potash feldspar. The solubility of sodium feldspar increases with the rise of temperature quickly; the solubility of three kinds of feldspar increases with the rise of temperature at the existence of three kinds of feldspar in solution respectively. At the respective existence of three kinds of feldspar, the higher the tempreture of groundwater solution and content of CO₂, the stronger the erodent capacity of three kinds of feldspar; the rise of temperature can drop the erodent capacity of three kinds of feldspar to groundwater solution in the situation that the three kinds of feldspar is present in the solution and can still enhance the erodent capacity of sodium feldspar .