China Resources New Energy Group Co.

HongKong, China

China Resources New Energy Group Co.

HongKong, China
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Zhang S.,China Institute of Atomic Energy | Ding Y.,China Institute of Atomic Energy | Gu Z.,China Institute of Atomic Energy | Wang X.,Peking University | And 7 more authors.
Chemistry Bulletin / Huaxue Tongbao | Year: 2014

Under the new situation of China's rapid development of nuclear energy, the development of new nuclear energy resources, spent fuel reprocessing, fuel cycle chemistry research on treatment and disposal of radioactive waste has become increasingly active. With the continuous development of science and technology, ion accelerators, reactors, various types of detectors and analytical equipments, and computer technology, the scope and results of nuclear chemistry and radiochemistry research continues to expand and increase, such as nuclear safety, environmental radiochemistry, radiation analytical chemistry, radiopharmaceuticals and labeled compounds. These researches for national defense construction, nuclear energy, nuclear technology have important supporting role. This article reviews the recent progress in these fields in China.


Wu T.,Huzhou Teachers College | Li J.,China Institute of Atomic Energy | Li J.,China Resources New Energy Group Co. | Dai W.,Huzhou Teachers College | And 7 more authors.
Science China Chemistry | Year: 2012

Gaomiaozi (GMZ) bentonite is regarded as the favorable candidate backfilling material for a potential repository in China. It is important to understand the diffusion behavior of 125I in GMZ bentonite and compare the diffusion behavior in GMZ and other types of bentonite like MX-80, Avonlea, etc. Therefore, through- and out-diffusion experiments were conducted to obtain the effective diffusion coefficient (D e) and distribution coefficient (K d). A computer code named Fitting for diffusion coefficient (FDP) was used for the experimental data processing and theoretical modeling. At the dry density of GMZ bentonite from 1600-2000 kg/m 3, the D e values of 125I were (2.4-20.4) × 10 -12 m 2/s and K d values were constants. At dry density above 1800 kg/m 3, the diffusion behaviors were almost the same, indicating that the anion exclusion was ineffective. Out-diffusion results showed that the species of 125I may be changed during the diffusion processing. It was probably caused by some organic matters or reducing substances in GMZ bentonite. Since the main composition of bentonite is montmorillonite, similar diffusion parameters were obtained in GMZ and other types of bentonite. The relationship of D e and accessible porosity (ε acc) could be described by Archie's law with exponent n = 1.2-2.8 for 125I diffusion in bentonite, whereas n = 2.0 in GMZ bentonite. Furthermore, bentonite with the dry density of 1800 kg/m 3 was proposed as the backfilling materials used in the construction of high level radioactivity waste repository. © Science China Press and Springer-Verlag Berlin Heidelberg 2012.


Liu L.,East China Institute of Technology | Hua R.,East China Institute of Technology | Hua R.,China Institute of Atomic Energy | Wang J.,East China Institute of Technology | And 6 more authors.
Journal of Chinese Mass Spectrometry Society | Year: 2014

Ion mobility spectrometry (IMS) is a trace gas detection technology developed from the seventies of last century. There are lots of advantage for IMS, such as simple structure, fast detection speed, atmospheric pressure working environment. It has a great potential for development of in the miniature and portable application. This paper introduced the basic principle of ion mobility spectrometry. We put emphasis on the research of ionization technique basic on IMS, and include outlooks on its future development.


Wu T.,Huzhou University | Li Q.-M.,Huzhou University | Li Q.-M.,East China Institute of Technology | Wang H.,Huzhou University | And 4 more authors.
He-Huaxue yu Fangshe Huaxue/Journal of Nuclear and Radiochemistry | Year: 2015

The abundant phosphate in a high level nuclear waste repository will influence the migration of radionuclides. Thus, the effect of phosphate on the diffusion behavior of Se(IV) in Gaomiaozi (GMZ) bentonite was investigated by through-diffusion method. The diffusion parameters like effective diffusion coefficient (De) and rock capacity factor (α) were determined by house-made code named Fitting for Diffusion Parameters. The De and α values were about (0.61-1.3)×10-11 m2/s and 0.16-0.58, respectively. It shows that the concentration of phosphate has insignificant effect on Se(IV) diffusion. Under acidic condition, both of De and α increased. The apparent diffusion coefficient (Da) value decreased because Se(IV) could be sorbed on the surface of bentonite. Since α was less than the total porosity, it could not be sorbed on bentonite. ©, 2015, Science Press. All right reserved.


Wu T.,Huzhou Teachers College | Yao J.,China Institute of Atomic Energy | Dai W.,China Institute of Atomic Energy | Dai W.,East China Institute of Technology | And 4 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

With the low permeability and high swelling property, Gaomiaozi (GMZ) bentonite is regarded as the favorable candidate backfilling material for a potential repository. The diffusion behaviors of HTO in GMZ bentonite were studied to obtain effective diffusion coefficient (D e) and accessible porosity (ε) by through-and out-diffusion experiments. A computer code named Fitting for diffusion coefficient (FDP) was used for the experimental data processing and theoretical modeling. The D e and ε values were (5.2-11.2) × 10 -11 m 2/s and 0.35-0.50 at dry density from 1,800 to 2,000 kg/m 3 values at 1,800 kg/m 3, respectively. The D e was a little higher than that of at 2,000 kg/m 3 , whereas the D e value at 1,600 kg/m 3 was significantly higher (approximately twice) than that of at 1,800 and 2,000 kg/m 3. It may be explained that the diffusion of HTO mainly occurred in the interlayer space for the highly compacted clay (dry density exceeding 1,300 kg/m 3). 1,800 and 2,000 kg/m 3 probably had similar interlayer space, whereas 1,600 kg/m 3 had more. Both D e and ε values decreased with increasing dry density. For and e could be compacted bentonite, the relationship of De and Dε described by Archie's law with exponent n = 4.5 ± 1.0. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Li J.Y.,China Resources New Energy Group Co. | Dai W.,Huzhou Teachers College | Dai W.,China Institute of Atomic Energy | Dai W.,East China Institute of Technology | And 5 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

99Tc is an important radionuclides related to repository safety assessment. The mobility pertechnetate (TcO4 -) can be reduced to immobility technetium(IV) hydrous oxides (TcO2· nH2O) by Fe(II)-bearing minerals. In China, Gaomiaozi (GMZ) bentonite is regarded as the favorable candidate backfilling material for the HLW repository, which is contained some FeO. The diffusion behavior of 99Tc was investigated in GMZ bentonite by through- and out-diffusion methods. The effective diffusion coefficient (D e), the accessible porosity (εacc), apparent diffusion coefficient (D a) and distribution coefficient (K d) were decreased with the increasing of dry density. The D e values were (2.8 ± 0.2) × 10-11 m2/s and (3.5 ± 0.2) × 10 -12 m2/s at dry density of 1,600 and 1,800 kg/m 3, respectively. It was indicated that the dominating species was TcO4 - during the diffusion processing. While, out-diffusion results showed that part of TcO4 - may be reduced by Fe(II). The relationship of D e and εacc could be described by Archie's law with exponent n = 2.4 for 99Tc diffusion in GMZ bentonite. Furthermore, the relationship between D a and dry density (ρ) was exponential. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Wu T.,Huzhou Teachers College | Wang H.,Huzhou Teachers College | Wang H.,Xi'an University of Science and Technology | Zheng Q.,Huzhou Teachers College | And 2 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

Polyaminopolycarboxylate EDTA with powerful metal-binding property, which often presents in low and intermediate-level waste, can enhance the radionuclide migration. The effect of EDTA on the diffusion behavior of 99TcO4 - and ReO4 - in Gaomiaozi (GMZ) bentonite was investigated by using through-diffusion method. For 99TcO4 - in present of EDTA, the D e values was (1.2 ± 0.1) × 10-11 m 2/s, which was 4 times higher than that in absent of EDTA. It can be explained that the complexation between 99TcO4 - and EDTA might be formed. By contrast, the D e values of ReO4 - remained unchanged in present or absent of EDTA, indicating that ReO4 - could not complex with EDTA. However, the diffusion of ReO4 - could be increased in present of EDTA, the D a value was found to be increased from 1.8 × 10-10 to 5.4 × 10-10 m2/s. It demonstrated that ReO4 - need more drastic conditions to form the Re(VII)-EDTA complexes than those used for 99TcO4 -. For both ReO4 - and 99TcO 4 -, the rock capacity factor α is less than the total porosity ε tot, indicating that they has little retention/sorption on the surface of bentonite. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Wang Z.,Huzhou University | Wang Z.,China Institute of Atomic Energy | Wang H.,Huzhou University | Li Q.,Jiangxi Provincial Water Conservancy Planning Design and Research Institute | And 5 more authors.
Applied Geochemistry | Year: 2016

In a high-level radioactive waste (HLW) repository, pH has an impact on the solubility, migration, and adsorption of radionuclides. Thus, understanding the effects of pH on the diffusion of radionuclides is essential for long-term disposal of HLW. In this work, the diffusion behaviors of Re(VII) and Se(IV) in compacted Gaomiaozi (GMZ) bentonite at different pH have been investigated by a through-diffusion method. The effective diffusion coefficient, i.e., De values of Re(VII) and Se(IV) were in the range of (1.0–2.4) × 10−11 m2/s at pH 3.0–10.0 and (0.38–2.3) × 10−11 m2/s at pH 3.0–9.0. In the case of Re(VII), the De values remained almost unchanged probably because ReO4 − was the dominant species in the pH range of 3.0–10.0. In the case of Se(IV), whose predominant species were HSeO3 − at pH < 9.0 and SeO3 2− at pH ≥ 9.0, the De values decreased by a factor of 3–6 at pH 9.0, i.e., De (pH < 9.0)/De (pH 9.0) ≈ 3–6, implying that the species with a higher valence state had a stronger anion exclusion effect. The decrease in De values can be explained by the diffusion species of Se(IV). Additionally, the rock capacity factor α decreased with the increase of pH. HSeO3 − was absorbed on GMZ bentonite with distribution coefficient Kd values in the range of (1.0–2.5) × 10−4 m3/kg at pH ≤ 8.0, whereas SeO3 2− was negligibly sorbed at pH > 8.0. © 2016 Elsevier Ltd

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