pH值对混合溶液中矿物溶解／沉淀的影响

以粉煤灰浸出液与自来水混合为例，结合水文地球化学模拟，分析了在混合作用下，pH值对单相混合溶液中矿物溶解／沉淀作用的影响。结果表明，由于混合作用，溶液pH值发生改变引起CO3^2-活度变化，从而影响方解石和白云石的饱和指数，随着混合比例从0．1到0．9的增加，实验和模拟单相混合溶液中白云石和方解石的饱和指数呈现不同规律的下降；在混合溶液pH值的影响下，玉髓饱和指数随混合比例的增大，呈现先上升后下降的变化趋势。

Impact of pH on Dissolution and Precipitation of Mineral in Mixing Solution

Taking the flyash leach mixing with tap water as a research object, the effect of pH on dissolution and precipitation of mineral in mixing solution is studied by hydrochemical simulation. The result shows that the pH causes the change of activity of CO3^2- and has an effect on the saturation of calcite and dolomite for single-phase mixing. In measured and simulated mixing solution, the saturation of Calcite and Dolomite is decreasing differently with the mixing ratio from 0. 1 to 0. 9. Under the influence of pH, the saturation of chalcedony presents the tendency of increase at the beginning and then decrease with the increase of mixing ratio.