Rapid immobilization of simulated radioactive soil waste by microwave sintering

Zhang, Shuai; Shu, Xiaoyan; Chen, Shunzhang; Yang, Huimin; Hou, Chenxi; Mao, Xueli; Chi, Fangting; Song, Mianxin; Lu, Xirui

doi:10.1016/j.jhazmat.2017.05.003

Cited by 57 publications

(20 citation statements)

References 36 publications

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“…Mix the pretreated soil and Nd 2 O 3 with the weight ratio of 1: 0.03, keeping the total mass of each sample as 3.09 g. To obtain a homogenous pristine sample, the raw materials were sufficiently mixed by grinding with ethyl alcohol (AR‐grade) in a mortar. In our previous work, pure glass matrix was obtained at 1300℃ 1,15 . Thus, to investigate the difference between glass and glass‐ceramic matrix in waste immobilization, the temperatures were selected as 1300, 1250, 1200, 1150, and 1100℃ in this work, that is, adopting a temperature gradient of 50℃.…”

Section: Methodsmentioning

confidence: 99%

“…Soil in certain regions might be seriously radioactively contaminated due to mining tailings or nuclear accidents 1‐3 . Radioactive‐contaminated soil would cause sustained long‐term harm to human health and the environment 4‐6 .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous studies, 1,15 microwave has been applied to immobilize contaminated soil to obtain a final glass matrix. Glass was a common matrix in the field of nuclear waste immobilization 16‐19 .…”

Section: Introductionmentioning

confidence: 99%

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

Wei

Shi

et al. 2021

J Am Ceram Soc

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wei

Shi

et al. 2021

J Am Ceram Soc

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“…To understand the effect of SPS proceedings on TRPO waste immobilization, the densities results of the samples with different waste contents are listed in Table 4. Compared with the densities results of the samples sintered via conventional method (~5.5 g·cm −3 ), 22,48 it can be found that the data are higher indicating that the obtained samples prepared by SPS condition were more compact. As can be seen in Figure 9, for the sample with 10 wt% waste, the density result increases from 6.043 to 6.873 g cm −3 .…”

Section: Resultsmentioning

confidence: 71%

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

Wei

Wen³

et al. 2021

Int J Energy Res

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As a rapid sintering method, spark plasma sintering (SPS) process has been widely applied to immobilize nuclear waste. In this work, trialkyl phosphine oxides (TRPO) were immobilized by the mixture of Gd 2 O 3 and ZrO 2 with SPS proceedings at 1650 C in 3 minutes. X-ray diffraction results present that the solid solubility is 10 to 20 wt% and all the sintered samples show a fluorite structure. Raman spectroscopy results show that the order degree of structure decreases as waste content increases. The lattice parameters decrease with the increasing doped waste content indicating the success of waste immobilization. Densities decrease for the sample with higher waste content which mainly caused by the existence of pores. Scanning electron microscope-energy dispersive X-ray spectroscopy and backscattered electron results perform the microstructure of the sintered sample. Furthermore, the leaching test shows that the sample has a considerable chemical stability. This study confirmed the possibility of rapid consolidation of Gd 2 Zr 2 O 7 bulk, dense ceramic with up to 10~20 wt% of immobilized TRPO waste. Highlights• Multi-nuclides waste was rapidly immobilized by Gd 2 Zr 2 O 7 via SPS process.• Phase transition happened with enhanced doping content.• Density results decreased with the higher waste content.• The order degree of structure decreased as waste content increased.• The sintered matrix represented considerable chemical stability. K E Y W O R D S ceramic, Gd 2 Zr 2 O 7 , immobilization, SPS, TRPO waste Ningning He and Guilin Wei contributed equally to this work.

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“…The bioremediation method requires a long period of restoration, and the growth of plants is limited by climate and geology [9]. In addition to the above methods, vitrification is an effective technology for the immobilization of long half-life wastes, especially for soil wastes contaminated by high radioactive nuclides [10,11]. Particularly, borosilicate glass is the most widely studied and utilized vitrified waste form in the world because of its good radiation resistance, corrosion resistance, and chemical stability [12].…”

Section: Introductionmentioning

confidence: 99%

Rapid Immobilization of Simulated Radioactive Soil Waste Using Self-Propagating Synthesized Gd2Ti2O7 Pyrochlore Matrix

Xue

Zhang

et al. 2019

Materials

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A rapid and effective method is necessary in the disposal of severely radioactive contaminated soil waste. Simulated Ce-bearing radioactive soil waste was immobilized by self-propagating high-temperature synthesis (SHS) within 5 min in this study. The main work includes the rapid synthesis of soil waste forms, the analysis of phase composition, microstructure and chemical durability. These results show that the simulated nuclide Ce was successfully immobilized into the pyrochlore-rich waste matrice, whose main phases are SiO2, pyrochlore (Gd2Ti2O7) and Cu. The normalized leaching rates of Si and Na on the 42nd day are 1.86 × 10−3 and 1.63 × 10−2 g·m−2·d−1, respectively. And the normalized leaching rate of Ce also remains at low level (10−5–10−6 g·m−2·d−1) within 42 days.

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Rapid immobilization of simulated radioactive soil waste by microwave sintering

Cited by 57 publications

References 36 publications

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

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

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

Rapid Immobilization of Simulated Radioactive Soil Waste Using Self-Propagating Synthesized Gd2Ti2O7 Pyrochlore Matrix

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Rapid immobilization of simulated radioactive soil waste by microwave sintering

Cited by 57 publications

References 36 publications

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

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

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd 2 Zr 2 O 7 ceramics

Rapid Immobilization of Simulated Radioactive Soil Waste Using Self-Propagating Synthesized Gd2Ti2O7 Pyrochlore Matrix

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Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics