Method for reducing glass solidification melting temperature of sandy soil polluted by radionuclides

Abstract

The invention belongs to the field of radioactive waste treatment, and relates to a method for reducing the glass solidification melting temperature of sandy soil polluted by radionuclides. Accordingto the method, raw materials are composed of 40-80 parts of sandy soil, 10-20 parts of boron oxide, 0-10 parts of sodium phosphate and 0-50 parts of waste glass powder. The method comprises the stepsof first putting 50-80 parts of sandy soil into a high-temperature-resistant crucible, and then laying 10-20 parts of boron oxide (or converted into boric acid containing a same mass ratio of boron oxide), 0-10 parts of sodium phosphate And 0-50 parts of waste glass powder sequentially on the surface layer of the sandy soil from bottom to top; putting the crucible into a high-temperature smeltingfurnace or other heating devices, conducting heating to 1400 DEG C, and keeping the temperature for 3-6 hours, and conducting cooling to obtain a uniform glass solidified body. According to the method, the melting temperature of sandy soil radioactive waste glass solidification is reduced, the melting time is shortened, the step of easily generating secondary pollution is avoided, the cost is reduced by utilizing waste glass powder, the capacity of waste is improved, and the glass solidified body with uniform physical and chemical properties is obtained.

Description

technical field [0001] The invention belongs to the field of radioactive waste treatment, and relates to the vitrification treatment of radionuclide-contaminated sand. The adopted method for reducing the vitrification melting temperature of the sand has important application value. Background technique [0002] Vitrification technology is currently the most commonly used medium and high level radioactive waste treatment technology at home and abroad. Solid pollutants are melted and vitrified at high temperature to form a glassy or glass-ceramic substance with a dense crystal structure, and the polluting nuclides are firmly bound in the glass. However, the industrial vitrification process is mainly aimed at the treatment of high-level radioactive waste liquid. It is necessary to mix and heat the concentrated solid waste with glass additives. First, the mass ratio of glass additives is relatively high, up to 70-85wt%, and the waste containment capacity is relatively high. The...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the vitrification technology of high-level radioactive liquid waste has been extensively and in-depth researched, but the vitrification formula and process research for sandy radioactive waste that is difficult to sort and reduce volume is still very limited.