Prevention of radioactive pollution: A comparative simulation study on the reduction of several important radionuclides by pyrite and magnetite

In order to ensure the long-term effective isolation of radionuclides from human beings environment, pyrite and magnetite, which exist widely stably in geological can be considered reduce strong mobility high-valence redox-sensitive nuclides low-valence with low mobility. this work, reducing reaction between pyrite, (U, Se, Tc, Np) Gansu proposed-treatment plant area was under simulation by PHREEQC. Due considerable existence quartz calcite surrounding rock interest, influence dissolved Ca 2+ SiO 3 2- should taken into account. The corresponding precipitation saturation index complex (UO X , Se(s), TcO2) species interest calculated, results suggested that significantly Np), their indexes (SIs) were usually positive. However, a given condition, showed certain effect against Se Np poor on U Tc. It worth noting aqueous pH system always remained constant because CO 2 partial pressure underground biosphere time scale. These conclusions have an important guiding significance for prevention retention radioactive pollution released biological environment.