Novel high-level waste deep geological disposal buffer material and construction method thereof

A technology for high-level radioactive waste and buffer materials, applied in nuclear engineering, radioactive purification, etc., can solve the problems of low thermal conductivity of pure bentonite, corrosion and leakage of metal disposal tanks, and difficulty in compacting dry density, etc., to achieve good plasticity and ensure dryness strong water-holding capacity

Pending Publication Date: 2018-08-28
HAINAN UNIVERSITY
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Problems solved by technology

[0008] At present, bentonite is used as a buffer material in China, but bentonite also has some disadvantages, such as: (1), the plasticity is too high, it is difficult to compact to the specified dry density, resulting in poor constructability; (2), the thermal conductivity of pure bentonite It is not parti

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with embodiment.

[0042] A new buffer material for deep geological disposal of high-level radioactive waste, including mixing and stirring the microbial solution and reinforcement solution with peanut shell powder as the carrier according to 1:1, and injecting the mixed solution into clay; the peanut shell The powder accounts for 38% of the microbial bacterial liquid; the microbial bacterial liquid is 20g / L of Bacillus sphaericus, 20g / L of Bacillus sarcina, 20g / L of Bacillus megaterium, 20g / L of Bacillus lentus or 20g / L of Bacillus pasteurianus Bacillus 20g / L, yeast extract 20g / L, ammonium chloride 10g / L, MnCl2·H 2 O12mg / L, NiCl 2 ·6H 2O24mg / L, distilled water 1000g / L configure the bacterium liquid that mixes together; Described reinforcement liquid is the mixed solution that calcium chloride 1mol / L and urea 1.5mol / L mix together.

[0043] The preparation temperature of the reinforcement solution i...

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Abstract

The invention discloses a novel high-level waste deep geological disposal buffer material. Clay, a microbial solution taking peanut shell powder as a carrier and consolidation liquid are stirred together; the microbial solution is a bacterial solution obtained by mixing bacillus sphaericus, sporosarcina pasteurii, bacillus megatherium, bacillus lentus, bacillus pasteurii and the like, and the consolidation liquid is a mixed solution obtained by mixing calcium chloride or calcium nitrate and urea. The invention further discloses a construction method utilizing the buffer material. The method includes the steps that a disposal repository is selected, a partition plate is installed at the bottom of the disposal repository, porous stone is put on the partition plate, a layer of clay is laid onthe porous stone, a high-level waste tank is placed on the clay, the disposal repository is backfilled with the clay, a waste liquid recycling tank and a gas cylinder are opened, the microbial solution and the consolidation liquid are introduced, the clay on the surface of the disposal repository is rolled for covering, and the surface of reinforced clay is flat and smooth. Accordingly, the thermal conductivity, plasticity and long-term stability are very good, and the safety of high-level waste disposal is effectively guaranteed.

Description

technical field [0001] The invention relates to a novel buffer material and a construction method thereof, in particular to a novel high-level radioactive waste geological disposal buffer material and a construction method thereof. Background technique [0002] The continuous development and utilization of nuclear energy, the production and research of the nuclear industry, and the application of nuclear technology will produce a certain amount of nuclear waste, which can be divided into low-level waste, intermediate-level waste and high-level waste according to their radioactive levels. At present, there are relatively mature technologies in the world for the ultimate safe disposal of waste. [0003] High-level radioactive waste usually refers to the high-level radioactive waste liquid and its solidification produced by the reprocessing of spent fuel, as well as the spent fuel components that are directly treated as waste. High-level radioactive waste is characterized by h...

Claims

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Application Information

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IPC IPC(8): G21F9/18
CPCG21F9/18
Inventor 胡俊吴雨薇吴岳峻汪树成
Owner HAINAN UNIVERSITY
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