地下水运移过程中碳酸钙溶解沉淀的反应动力学

地下水运移过程中常常会出现碳酸钙的溶解和沉淀,特别是在CO₂+O₂地浸采铀中,这一现象极为普遍。众多学者对碳酸钙沉淀的形成进行了较为成熟研究,确定了pH对碳酸钙形成的重要作用,以及碳酸钙沉淀的pH边界值。然而,通过热力学只能对反应发生的方向和可能性进行表征,而不能表达化学反应速率,要想了解碳酸钙在地下水运移过程中的溶解沉淀演化过程,必须对其反应动力学特征进行研究。从碳酸钙溶解和沉淀的反应速率以及水化学组分对反应速率的影响等方面进行阐述,旨在研究地浸条件下碳酸钙的反应动力学,确定其溶解和沉淀的主要控制作用以及反应速率,为研究CO₂+O₂地浸采铀中碳酸钙堵塞提供理论基础。

Kinetics of Calcite Dissolution and Precipitation in Groundwater Transport

Calcite often dissolute and precipitate during groundwater transport, especially in uranium in-situ leaching with CO2+O2. Scholars study formation of calcite and determine boundary value of pH, which play a role in calcite occur. However, thermodynamics only characterizes the direction and probability of reaction without chemical reaction rate. Reaction kinetics is necessary studied to knowledge the fate of calcite in groundwater transport. Significant progress about reactive rate of calcite dissolution and precipitation as well as influence of water chemistry composition on reaction rate was summarized. It aims to study reaction kinetics of calcite and determine control effect and reactive rate, and provide theoretical basis for calcite clogging during uranium in-situ leaching with CO2+O2.