低温常压条件下NaCl-H_2O体系对铜活化迁移的影响因素Ⅱ：pH值和盐度

Influence factors Ⅱ: pH and salinity on copper activation migration in NaCl-H_2O system under condition of atmospheric pressure and low temperature

文章采用动态模拟实验研究了卤水NaCl-H2O体系不同盐度、酸碱度对砂岩中铜元素的活化迁移作用。结果表明,在常压室温环境下,卤水盐度越高,越有利于含铜砂岩中铜的活化迁移,不同盐度卤水对铜的活化强度表现为w(NaCl)为25%的溶液>w(NaCl)为20%的溶液>w(NaCl)为10%的溶液>w(NaCl)为5%的溶液。酸碱度条件模拟实验,揭示了强酸(pH=0.71)或者强碱(pH=10.28)环境有利于铜的活化迁移,尤其是在强酸(pH=0.71)条件下,可极大增强铜的溶解性,这对于解释蒸发岩盆地含铜卤水的成矿过程具有重要的理论和实际意义。

This study focused on the activation effect of sandstone copper in the NaCl-H2O system by the dynamic simulation experiments under the conditions of different salinities and acidities. The results show that the higher the brine salinity, the more favorable the condition for copper＇s activation and migration in cupreous sandstone in the environment of atmospheric pressure and room temperature. The activation capability of Cu under different brine salinities shows the regularity 25% NaCl solution 〉 20% NaCl solution 〉 10% NaCl solution 〉 5% NaCl solution; In addition, the copper element is much easier to be activated in a strong acid （pH=0.71） or strong alkali （pH=10.28） environment; especially under the condition of strong acid （pH=0.71）, the solubility of Cu could be greatly enhanced. The research provides important theoretical and practical basis for explaining the metallogenic process of Cu-bearing brine in evaporite basin.