Cementation of liquid radioactive waste with high content of borate salts

Abstract

There are physical and chemical methods which allow accelerating the processes of cement compounds setting and hardening for liquid radioactive waste with aqueous solutions of boron with low pH. Boron compounds with low pH are the main components of liquid radioactive waste which prevent fast hardening. In order to control the speed of cement solution hardening and to remove the components that prevent hardening it is proposed to use electromagnetic treatment of liquid radioactive waste in the vortex layer of ferromagnetic particles.

Minimization of radioactive waste volume from nuclear power plants using precipitation-membrane technologies

“…The second position follows from the very fact that the leaching of components is difficult, which is limited not only by the diffusion coefficient of the component in the matrix, but also by the limitation of its concentration, as well as the compatibility of such mineral-like structures with any binders, primarily cements [15,16].…”

Characterization of Simulated Liquid Radioactive Waste in a New Type of Cement Mixture

“…Based on the literature, boric acid waste could contain 90 Sr, 137 Cs, 51 Cr, 60 Co, and other radionuclides. 4,6 To ensure the radiological safety after waste disposal, this solidified radioactive waste is required to have some properties such as adequate mechanical strength, low leachability, beneficial effects during water immersion, and good durability. Our study takes into account the main guidance document of waste acceptance criteria (WAC) 7,8 Waste Repository.…”

“…The boric acid waste is generally solidified with a cement matrix, and this solidified radioactive waste is packed into containers that are isolated from the human environment by safe disposal . This study was carried out on the immobilization of evaporator concentrates containing borates in a new cement matrix and evaluation of its long-term stability. − …”

“…A simulated concentrated borate waste solution was used in the present study to evaluate the chemical characterization of the solidified borate-containing cement. Based on the literature, boric acid waste could contain 90 Sr, 137 Cs, 51 Cr, 60 Co, and other radionuclides. , …”

“…Based on the literature, boric acid waste could contain 90 Sr, 137 Cs, 51 Cr, 60 Co, and other radionuclides. 4 , 6 …”