A wet-oxidation procedure of radioactive waste resin and waste concentrated liquid for 3H and 14C analysis

Huang, Yunhao; Jing, Jiang; Zeng, Fan; Liu, Xinhua

doi:10.1007/s10967-020-07354-8

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…With the development of the nuclear engineering industry, the amount of spent radioactive organic solvents generated has increased significantly, posing a huge challenge to the progress of the nuclear industry and environmental protection. Many advanced methods have been applied to treat these radioactive organic solvents, such as pyrolysis [2,3] , steam reforming [4] , supercritical water oxidation [5,6] , wet oxidation [7,8] , and electrochemical catalytic oxidation [9,10] . Among the methods of treating TBP/OK spent radioactive organic solvents, pyrolysis/incineration is one of the most commonly used methods in engineering applications because of its low secondary waste liquid generation, corrosion of equipment, and nuclide entrainment in the tail gas [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Technological process for treating radioactive TBP/OK spent solvents

Ma,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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Tributyl phosphate (TBP) and kerosene (OK) spent radioactive organic solvents will be produced during the nuclear fuel reprocessing process, which may cause equipment corrosion by direct incineration. Therefore, additives need to be added to prepare a uniformly stable suspension. The amount of each raw material added during the preparation process and the stirring operation can have a significant effect on the performance of the suspension. In this paper, the influence of the amount of each raw material and the stirring rate on the emulsion formation, stabilization time, and fluidity of suspension is studied through different experiments to optimize the suspension formulation of the pyrolysis/incineration processes. The experimental results show that when the volume content of TBP was 30%~60%, the prepared suspension had excellent performance and could be used as the basic solution for suspension formulation. In contrast, when the volume content of TBP was more than 80%, the prepared suspension became less stable, the emulsion phase broke and settled, and the performance of the suspension was poor. When the volume contents of TBP were 30% and 60%, respectively, the DBP content was less than 0.26% and 0.6%, respectively, the Ca-P ratio was 1.25~1.75. Water content was 8~12%. The prepared suspension had great emulsion formation and fluidity. The viscosity and stability time meet the requirements with little secondary waste. The suspension can be applied in TBP/OK spent radioactive organic solvents pyrolysis/incineration reprocessing project.

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Section: Introductionmentioning

confidence: 99%

Technological process for treating radioactive TBP/OK spent solvents

Ma,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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“…Thus, the treatment of radioactive waste organic solvent TBP/OK [4,5] is essential in the plutonium uranium reduction extraction process (PUREX) [6][7][8]. Many advanced methods have been applied to treat this organic waste solvent, such as pyrolysis [9,10], steam reforming [11], supercritical water oxidation [12,13], wet oxidation [14,15], and electrochemical catalytic oxidation [16,17]. However, there are too many problems with some technologies, making it very difficult to apply them in the nuclear industry at present.…”

Section: Introductionmentioning

confidence: 99%

The Design and Verification of a TBP/OK Pyrolysis Incineration Stable System

Zhao

Liu

et al. 2023

Processes

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This project designed and created a large-scale pyrolysis incineration system that decomposes waste tributyl phosphate/kerosene (TBP/OK) solvent from the plutonium/uranium process (PU-REX) in the nuclear industry. This system consists of a suspension preparation system (SPS), a pyrolysis and ash discharge system (PADS), and a combustion furnace and gas treatment system (CGS). The preparation of a waste TBP/OK emulsified suspension in the SPS, continuous operation experiments of the PADS and CGS, and pyrolysis incineration experiments were conducted. The results show that the SPS achieved the automatic preparation and feeding of emulsified suspensions at 30 kg/h. The PADS decomposed 99.99% of the TBP/OK emulsified suspensions and fixed more than 99% of phosphorus. The CGS burned the pyrolysis gas without diesel oil and purified more than 99.995% of the radioactive nuclides. This system showed great feasibility, stability, continuity, and safety, proving the compatibility between multiple systems of this new design. This paper marks a significant step in pyrolysis incineration technology for the nuclear industry.

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