摘要:
Through the analysis of characteristics and laws of the radiant hazards in uranium waste rock and tailings to the environment, decommissioning the present situation of uranium mining and milling facilities in our country, and combining with the main research work, this article makes a series of management strategies.
摘要:
The water-based Fe3O4 magnetic fluids were prepared by chemical co-precipitation of Fe2+ and Fe3+ using NaOH to control the pH, different surfactants were added to modify the magnetic particles. The stability, viscosity of the fluids and the magnetic property of magnetic particles were evaluated. The influences of different factors, such as reacting time, temperature, stirring speed, pH value, supersonic dispersing time, molar ratio of Fe2+/Fe3+, and surfactant, on properties of magnetic fluids were discussed. The experimental results showed that the optimal conditions were: molar ratio of Fe2+ and Fe3+ 1:1.5, pH value 9.0, stirring speed 1500 r.min(-1), reacting time 10 minutes, temperature 55 degrees C, supersonic dispersing time 30 minutes, suitable surfactant Tween 80.