Solid waste-based sulphoaluminate cement solidified base material of medium and low radioactive nuclear waste and preparation method thereof

A sulfoaluminate-based and low-radioactive technology is applied in the field of solid waste-based sulfoaluminate cement curing substrate and its preparation, which can solve the problems of short setting time, low cost and limited performance, and achieve strong curing effect, Reduced production cost and excellent performance

Active Publication Date: 2022-02-15
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cement curing has become the most commonly used curing method due to its simple process, strong adaptability, and low cost. Ordinary Portland cement is the most commonly used base material. There are still many problems and defects in the curing of ordinary Portland cement, such as high nuclide leaching, Limited performance, high cost, single process route, etc.
[0004] Sulphoaluminate cement has many advantages in the solidification of nuclear waste, such as high waste containment capacity, high solidified body strength, low nuclide leaching, low alkalinity (10-11.5), short setting time and strong immersion resistance, etc. However, raw materials for the production of sulphoaluminate cement, which have a good curing effect on nuclear waste, such as bauxite, natural gypsum and limestone, have high grade requirements, and the national industrial policy strictly controls mineral development. Many factors lead to the existence of sulphoaluminate cement. Bottleneck problems such as limited raw materials and high costs make it difficult to use in nuclear waste solidification applications
Although there are currently related studies on the preparation of sulphoaluminate cement from solid waste, the composition of solid waste is relatively complex, which is likely to affect the immobilization effect of the prepared sulphoaluminate cement on nuclear waste to a large extent, and it is difficult to achieve expectations curing effect

Method used

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  • Solid waste-based sulphoaluminate cement solidified base material of medium and low radioactive nuclear waste and preparation method thereof
  • Solid waste-based sulphoaluminate cement solidified base material of medium and low radioactive nuclear waste and preparation method thereof

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preparation example Construction

[0027] In a second aspect, the present invention provides a method for preparing the solid waste-based sulphoaluminate cement solidified base material of the low-medium radioactive nuclear waste, comprising the following steps:

[0028] After the garbage fly ash and aluminum ash are mixed and pretreated, they are mixed with the dried desulfurized gypsum in proportion, and the mass ratio of garbage fly ash, aluminum ash, and desulfurized gypsum is 25-45:27-33:20-40;

[0029] Grinding the mixed raw material until the particle size of the material after grinding is less than 8 μm;

[0030] It is obtained by calcining the mixed raw meal after grinding.

[0031] In some embodiments, the mixed pretreatment method of garbage fly ash and aluminum ash is as follows: After mixing garbage fly ash and aluminum ash in proportion, perform high-temperature heating pretreatment, the heating temperature is 900-950°C, and the heating time is 20- 40min. The heat treatment temperature of 900-95...

Embodiment 1

[0039] Such as figure 1 As shown, the garbage fly ash, aluminum ash, and desulfurized gypsum were pretreated at 34.1, 28.2, and 37.7 parts by mass, respectively, and then put into the raw meal mill for grinding, and the raw meal obtained was passed into the homogenization tank for homogenization , and then transported to a calcination device for calcination, the calcination temperature is 1250° C., and the calcination time is 60 minutes to obtain a sulphoaluminate solidified substrate.

[0040] The compressive strength of cement slurry (the mass ratio of sulfoaluminate solidified base material to water is 7:3) at 3 days and 28 days is 68.5Mpa and 100.6Mpa, respectively.

[0041] 0.750kg of solid waste-based sulfoaluminate cement solidified substrate, 0.220kg of sand and Cs waste liquid concentrate (the concentration of Cs waste liquid concentrate is boron content 30g / L, total salt content 100g / L, Cs content 1wt %) 0.320L mixing and stirring, curing and molding.

[0042] The ...

Embodiment 2

[0046] Garbage fly ash, aluminum ash, and desulfurized gypsum are pretreated according to the following mass parts: 32.2 parts, 30.2 parts and 37.6 parts respectively, and then put into the raw meal mill for grinding. The obtained raw meal is passed into the homogenization tank for homogenization, and then transported Calcination in a calcination device with a calcination temperature of 1270° C. and a calcination time of 60 minutes to obtain a sulfoaluminate solidified substrate.

[0047] The compressive strength of cement slurry (the mass ratio of sulfoaluminate solidified base material to water is 7:3) at 3 days and 28 days is 71.2Mpa and 105.9Mpa, respectively.

[0048] Solid waste-based sulfoaluminate cement solidified substrate 0.750kg, sand 0.220kg and Cs waste liquid concentrate (the concentration of the Cs waste liquid concentrate is boron content 35g / L, total salt content 100g / L, Cs content 1.0 wt%) 0.320L, mixed and stirred, solidified and formed.

[0049] The Cs le...

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Abstract

The invention discloses a solid waste-based sulphoaluminate cement solidified base material of medium and low radioactive nuclear waste and a preparation method thereof. The composition of the raw material is as follows: the mass ratio of garbage fly ash, aluminum ash and desulfurized gypsum is 25-45 ; 27-33; 20-40; the moisture content of the dried material is less than 5% by mass, and the particle size of the material after raw powder proportioning and grinding is less than 8 μm. The prepared cured substrate has a strong curing effect on nuclear waste, and the leaching rate of Cs in the cured body after 42 days is 2.0-2.5×10 ‑ 7 cm / d, the leaching fraction is 1.0~1.2×10 ‑4 cm, are far lower than the 4×10 required by GB14569.1‑2011 ‑3 cm / d and 0.26cm.

Description

technical field [0001] The invention relates to the technical field of nuclear waste solidification materials, in particular to a solid waste-based sulphoaluminate cement solidification base material of medium and low radioactive nuclear waste and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, solidification technology is generally used for nuclear waste disposal of medium and low-level radioactive nuclear waste. The nuclear waste is immobilized in a stable substrate and disposed of in deep burial. Cement curing has become the most commonly used curing method due to its simple process, strong adaptability, and low cost. Ordinary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C04B7/147C04B7/26C04B28/06G21F9/16
CPCC04B7/32C04B7/26C04B7/147C04B28/06G21F9/165C04B2111/00017C04B2201/50C04B14/06C04B18/0463Y02P40/10
Inventor 王文龙李敬伟王旭江贾爱光蒋稳张超吴长亮毛岩鹏宋占龙
Owner SHANDONG UNIV
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