酸法浸铀过程中Fe3+与浸出铀之间关系的数值模拟

为探究酸法地浸过程中Fe³⁺作为氧化剂时铀的浸出情况，通过使用模拟软件PHREEQE建立模型，观察浸出液各组分的浓度及迁移变化，揭示氧化剂Fe³⁺与浸出铀之间的关系。结果表明：作为氧化剂的Fe³⁺促使铀矿的溶解及Fe²⁺的出现，随着铀的浸出结束，Fe³⁺的浓度趋于稳定；且铀矿的溶解速率与Fe³⁺、Fe²⁺的增长速率密切相关。Fe³⁺的浓度增长变快时，Fe²⁺的浓度增长及铀矿的溶解也加快；随着铀矿的溶解速率降为零后，Fe²⁺的增长速率也趋近于零，氧化剂Fe³⁺的增长速率也降为零。

Numerical Simulation of Relationship between Fe3+ and Leached Uranium during Acid Leaching

In order to explore the leaching situation of uranium with Fe3+ as oxidant in acid leaching process, the simulation software PHREEQE was used to establish a model to observe the concentration and migration changes of each component of the leaching solution, so as to reveal the relationship between the oxidant Fe3+ and leached uranium. The results show that as an oxidant, Fe3+ promotes the dissolution of uranium ore and the appearance of Fe2+. With the end of uranium leaching, Fe3+ concentration tends to be stable. The dissolution rate of uranium ore is closely related to the growth rate of Fe3+ and Fe2+. When the concentration of Fe3+ rises rapidly, Fe2+ concentration rises and dissolution of uranium ore accelerates. As the dissolution rate of uranium ore drops to zero, the growth rate of Fe2+ approaches zero, and the growth rate of oxidant Fe3+ also drops to zero.