Vermiculite as a potential component of the engineered barriers in low- and medium-level radioactive waste repositories

Fuks, L.; Herdzik-Koniecko, Irena

doi:10.1016/j.clay.2018.04.010

Cited by 25 publications

(10 citation statements)

References 38 publications

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“…We add the power loss to overcome the friction force (6) in the interface of the tray with the base plate. At one half-cycle, the negative work of Afr of this force will be determined by the product of the force by displacement (J):…”

Section: Furnace With a Forced Base Plate Movementmentioning

confidence: 99%

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Structural and dynamic characteristics of technological power unit for heat treatment of vermiculite concentrates

2019

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The considered electric furnace with a mobile base is the most innovative power unit providing energy consumption of 48…52 mJ/m3 during the process of vermiculite firing which has never been achieved before. New power unit was developed for all mechanical shortcomings of the test prototype were eliminated. By eliminating the resonating base plate and switching to the platform with forced excitation of its vibrations, the influence of fluctuations in the excitation frequency of the oscillatory system on its technological parameters, ensuring the duration of vermiculite heat treatment, has been eliminated. The activity of high sensitivity of the oscillations of the base platform to the change in friction, which appears during operation, is also completely removed. In addition, the problem of a controlled and regulated vibrational method of supplying raw materials to the furnace without the use of drum doses has been solved. It simplifies the design and cost of new power units, which are characterized by doubled productivity and dynamic balance.

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Section: Furnace With a Forced Base Plate Movementmentioning

confidence: 99%

“…The research of technologies and equipment for expanded vermiculite production and products from it have been carried out from the 40s of the last century to the present, both in our country and abroad [1][2][3][4][5][6]. It indicates the importance of this product and the incompleteness of above-mentioned research.…”

Section: Introductionmentioning

confidence: 99%

Structural and dynamic characteristics of technological power unit for heat treatment of vermiculite concentrates

2019

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“…However, apart from the various radionuclides, excessive amounts of chloride salts, nitrate, and sulfate were also found in the waste. 4 The high salinity, massive radionuclides, and radioactivity of LLRE put forward high technical requirements for separation methods.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Therefore, the recycling of U(VI) from low-level radioactive effluents (LLRE) not only is beneficial for protecting the ecological environment but also has practical significance for the sustainable development of nuclear energy. However, apart from the various radionuclides, excessive amounts of chloride salts, nitrate, and sulfate were also found in the waste . The high salinity, massive radionuclides, and radioactivity of LLRE put forward high technical requirements for separation methods.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Ion-Imprinted Silica for Selective Uranium Extraction from Low-Level Radioactive Effluents

Gan

et al. 2021

ACS Sustainable Chem. Eng.

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The recovery of uranium from low-level radioactive effluents (LLRE) is of strategic significance for the sustainable development of nuclear energy. However, the high salinity, massive coexisting nuclides, and radioactivity of LLRE are the major challenges for selective uranium extraction. Herein, a two-dimensional U(VI)-imprinted strategy is developed for highly selective uranium extraction through one-step fabrication of a specific U(VI)-imprinted cavity on silica lamellar. Thanks to the two-dimensional structure of silica lamellar, the optimal adsorbent possesses a high specific surface area of 497.7 m2 g–1 and abundant imprinted cavities with a phosphate group. Thus, the adsorbent has an adsorption capacity of 224.2 mg g–1 at 298 K, which is higher than most of the U(VI)-imprinted adsorbents. As the temperature increases to 308 and 318 K, the adsorption capacity gradually increases to 253.8 and 274.0 mg g–1, respectively. In addition, due to the great affinity to uranium and stability of imprinted cavities, the adsorbent exhibits a good salt tolerance of adsorption and a high selectivity for uranium against other coexisting ions even after 6 adsorption–desorption cycles. This work provides an efficient strategy for designing selective U(VI) adsorbents for LLRE treatment, which is meaningful in environmental and energy fields.

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“…A study of a number of domestic and foreign sources of information did not show any dependencies or recommendations on the duration of heat treatment of vermiculite concentrates, with the exception of few not systematized data [1][2][3][4][5][6][7][8][9][10][11][12][13][14], obtained experimentally and from production experience.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Process of Heat Treatment of Vermiculite Concentrates in Power Process Units with a Mechanical Base

Gavrilin¹,

Нижегородов²,

Moyzes³

et al. 2019

Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)

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The article reviews the simulation of functional dependence of the heat treatment process time of vermiculite concentrates on their size groups (fractions) in power process units with a mechanical base plate, in which the movement of expanded vermiculite is set by vibro-transporting bulk material in the thermal field of electric heaters. At present we research the process of conductive layer-by-layer heat transfer into the vermiculite grains with the purpose to figure out the so-called "expected time" of temperatures balancing and the time of full expansion in the process of heat treatment of concentrates. The experimental data on the firing time of vermiculite concentrates from various deposits and their comparison with the results of analytical simulation are presented. It was firstly found that grain size of vermiculite concentrates depends on the duration of firing. This dependence was proved by the experimental results of the research.

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Vermiculite as a potential component of the engineered barriers in low- and medium-level radioactive waste repositories

Cited by 25 publications

References 38 publications

Structural and dynamic characteristics of technological power unit for heat treatment of vermiculite concentrates

Structural and dynamic characteristics of technological power unit for heat treatment of vermiculite concentrates

Two-Dimensional Ion-Imprinted Silica for Selective Uranium Extraction from Low-Level Radioactive Effluents

Simulation of the Process of Heat Treatment of Vermiculite Concentrates in Power Process Units with a Mechanical Base

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