Mechanical and leaching properties of neodymium‐contaminated soil glass‐ceramics

Abstract

The safe treatment of radioactive‐contaminated soil is of great significance. In this work, neodymium‐contaminated soil was successfully immobilized using microwave sintering to form glass‐ceramics. The microstructure, morphology, elemental distribution, Vickers hardness, and chemical durability of the sintered samples were analyzed. The results showed that the glass‐ceramic is more suitable to immobilize the waste compared with the glass matrix. XRD and SEM‐EDS results proved that the waste form has been totally immobilized in the sintered matrix whether in glass‐ceramics and glass. However, the leaching rate of element Nd in glass‐ceramic was lower than the glass matrix at 28 d. Moreover, the Vickers hardness results of glass‐ceramic were higher than that of glass. Thus, glass‐ceramics can not only reduce sintering temperature and save energy but also achieve a better immobilizing effect. Our investigation reflects that glass‐ceramics are more suitable for neodymium‐contaminated soil immobilization using the microwave sintering method.

Treatment of zeolite adsorbed material as a potential nuclear waste glass‐ceramic matrix

“…Moreover, based on the comparison of XRF results, the components of the purchased zeolite used in this work are similar to the soil constituents in our previous work. 23 The reported work has been proved that the glass-ceramic has more advantages in certain conditions than glass matrix, which further reveals the proposed method of treatment of zeolite waste is reliable. The specific immobilizing mechanism diagram is shown in Figure 15.…”

“…Based on the investigated results (suitable sintering temperature and holding time), the simulated zeolite adsorbed different wastes were sintered by the same process. The waste content was set as 3 wt% and samples with SrSO 4 , Nd 2 O 3 , and CeO 2 were named as Z‐Sr, Z‐Nd, and Z‐Ce 23 . The synthesis process details are shown in Figure 1.…”

“…29,30 The physics of resin under pressure is similar to the seepage pr lar approaches have been used also to mod into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] T in these cases to determine the resin flow ing times corresponding to different infilt Preceramic polycarbosilane polymers as precursors to make ceramic fibers 10,3 trix. [7][8][9]40,41 The chemical and volume ch pany ceramization of the polymer during documented in several studies.…”

“…The waste content was set as 3 wt% and samples with SrSO 4 , Nd 2 O 3 , and CeO 2 were named as Z-Sr, Z-Nd, and Z-Ce. 23 The synthesis process details are shown in Figure 1.…”

“…29,30 The physics of resin flow into a mold under pressure is similar to the seepage problem and so similar approaches have been used also to model the flow of resin into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] The models are used in these cases to determine the resin flow front and mold filling times corresponding to different infiltration conditions.…”