氧化剂对超临界CO_2流体浸取矿石中铀的影响

Effect of oxidants on the extraction of uranium from ore by supercritical CO_2 fluid

铀是重要的核能燃料,而铀的高效采冶特别是低品位铀矿资源的开发是核电发展的基础。文中采用实验室自主研制的多功能超临界CO_2浸取装置来浸取铀矿石。利用正交设计,研究氧化剂种类、压强、反应时间、温度对铀浸出率的影响,得出超临界CO_2流体浸取铀矿石的最佳工艺参数。研究表明:以Fe_2(SO_4)_3为氧化剂时,浸出效果最佳。使用Fe_2(SO_4)_3为氧化剂时,在压强为12 MPa、反应时间120 min、温度为45℃的条件下,超临界CO_2流体对铀的浸出率达到90.24%。超临界CO_2流体可望应用于实际低品位铀矿山中铀的提取。

Uranium is an important nuclear fuel, and the development of uranium mining and metallurgy, especially low grade uranium resources, is the foundation of nuclear power development. The multi-function supercritical CO2 extraction device developed by the laboratory was used to leach uranium ore. By orthogonal design, study pressure, oxidant, reaction time and temperature on the effect of uranium leaching rate, the supercritical CO2 fluid extraction from the optimum process parameters of uranium ore. The results show that the leaching effect is the best using Fe2（SO4）3 as the oxidizing agent. When using Fe2 （SO4）3 as the oxidant agent, at 12 MPa, reaction time 120 min, 45℃ , fluid uranium leaching rate can reach 90.24% under supercritical CO2. Supercritical CO2 fluid extraction was expected to be applied to the actual low-grade uranium mines uranium.