温度及硫酸盐溶液对长石溶解度影响的数值模拟  

Numerical simulation of the influence of temperature and sulfate solutionon on the solubility of feldspar

作　　者：梁冰[1] 郑训臻[1] 金佳旭[2] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]东北大学资源与土木工程学院,辽宁沈阳110000

出　　处：《广西大学学报（自然科学版）》2012年第5期1008-1012,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50974070);国家博士点基金资助项目(20102121110003)

摘　　要：为了研究温度及硫酸盐溶液对长石溶解度影响,应用由美国地调所(USGS)开发的PHREEQC软件,对无CO2分压(CO2分压为0 MPa)和开放状态(CO2分压为10-4.5 MPa)下钠长石、钾长石和钙长石在不同温度、不同浓度的MgSO4溶液和Na2SO4溶液中达到溶解平衡时的溶解度进行数值模拟,结果表明:钠长石、钾长石、钙长石在纯水中的溶解度随着温度的升高均出现增大的趋势;在25℃且无CO2分压情况下,3种长石的溶解度均出现随着Na2SO4、MgSO4溶液浓度的增加而降低的情况;在不同CO2分压情况下,在相同浓度的硫酸盐溶液中长石的溶解度随着温度的升高而增大;Na2SO4溶液对钾长石和钙长石的侵蚀作用要比对钠长石的侵蚀严重;温度对长石溶解度的影响大于硫酸盐溶液对长石溶解度的影响。In order to study the influence of the temperature and sulfate solution on the solubility of feldspar, the solubilities of albite, potash feldspar and auorthite at different temperatures and in dif- ferent concentrations of MgSO4 and N%SQ solutions were numerically simulated by PHREEQC soft- ware which was developed by USGS under no CO2 partial pressure （CO2partial pressure at 0 MPa） and open state （CO2 partial pressure at 10-4.5 MPa）. The results show that solubilities of albite, potash feldspar and anorthite increase with the increasing of temperature in water. At 25 ℃ and in non-CO2 differential pressure situation, the solubilities of the three kinds of feldspar decrease with the increases of Na2SO4 and MgSO4 concentration. In the presence of CO2 pressure, the solubility of feldspar increases with the increase of temperature in the same sulfate solutions. Potash feldspar and anorthite corrosions are more severe than that of albite in Na2SO4 solution. The influence of tempera- ture on the solubility of feldsoar is more imoortant than that of sulfate solution

关 键 词：温度 硫酸盐 长石 溶解度 PHREEQC软件 

分 类 号：P342.1[天文地球—水文科学]