Low-temperature curing method for silver coated silica gel

A curing method, silver silica gel technology, applied in the direction of radioactive purification, nuclear engineering, etc., can solve the problems of unsatisfactory long-term disposal of radioactive iodine, the deformation of the solidified body affects the stability, etc., achieve good industrial application prospects, inhibit migration, and the process is simple Effect

Active Publication Date: 2019-06-21
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can directly form AgI to cure radioactive iodine, but the silica gel particles themselves are easily affected by external environmental factors such as pressure

Method used

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  • Low-temperature curing method for silver coated silica gel
  • Low-temperature curing method for silver coated silica gel
  • Low-temperature curing method for silver coated silica gel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0067] In this example, the common iodine-127 is used to simulate the radionuclide iodine-129. A low-temperature curing method for silver-coated silica gel, comprising the following steps:

[0068] (1) mixing and grinding silica gel particles and AgI to obtain iodine-containing silver-coated silica gel particles, and filtering through a filter to obtain iodine-containing silver-coated silica gel particles with a maximum outer diameter less than or equal to 200 μm;

[0069] (2) Mix iodine-containing silver-coated silica gel particles with borate raw material powders (boron oxide, bismuth oxide and zinc oxide), grind after adding deionized water to obtain a wet mixture, and dry the wet mixture, A dry mixture is obtained; in the borate raw material powder, in terms of mass percentage, boron oxide is 60%, bismuth oxide is 28%, and zinc oxide is 12%. In actual use, boron oxide is 40% to 70%, bismuth oxide is 22% to 48%, and zinc oxide is 8% to 12%. In the dry mixture, silver-coate...

Embodiment 2

[0075] In this example, the common iodine-127 is used to simulate the radionuclide iodine-129. A low-temperature curing method for silver-coated silica gel, comprising the following steps:

[0076] (1) mixing and grinding silica gel particles and AgI to obtain iodine-containing silver-coated silica gel particles, and filtering through a filter to obtain iodine-containing silver-coated silica gel particles with a maximum outer diameter less than or equal to 200 μm;

[0077] (2) Mix iodine-containing silver-coated silica gel particles with borate raw material powders (boron oxide, bismuth oxide and zinc oxide), grind after adding deionized water to obtain a wet mixture, and dry the wet mixture, A dry mixture is obtained; in the borate raw material powder, according to mass percentage, boron oxide is 50%, bismuth oxide is 40%, and zinc oxide is 10%. In the dried mixture, by mass fraction, silver-coated silica gel is 65.65%, iodine element is 14.35%, and borate glass ceramic powd...

Embodiment 3

[0081] like figure 1 As shown, this embodiment discloses a curing device for implementing the method of the present application, and the curing device includes:

[0082] Silver-coated silica gel particle filter mechanism 3;

[0083] Colloid mill 4, for mixing and grinding silver-coated silica gel particles and borate raw material powder;

[0084] Drying device 5, is used for receiving the wet mixture from colloid mill 4, and to mixture drying, obtains dry mixture;

[0085] The second sintering device 6 is used for sintering the dried mixture.

[0086] The second sintering device 6 may be equipment such as a high-temperature muffle furnace or a microwave sintering furnace.

[0087] like figure 2 As shown, the silver-coated silica gel particle filter mechanism 3 includes:

[0088] weighing scale 8;

[0089] The first funnel 10 is arranged directly above the weighing scale 8;

[0090] Filter screen 11 is installed in the first funnel 10;

[0091] The first vibration moto...

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Abstract

The application of the invention discloses a low-temperature curing method for silver coated silica gel. The low-temperature curing method comprises the following steps: mixing a silver coated silicagel particle containing radioactive iodine with a raw material powder of borate, and adding deionized water to grind, to obtain a damp mixture, wherein the raw material powder of borate comprises boron oxide, bismuth oxide and zinc oxide; drying the damp mixture to obtain a dried mixture; sintering the dried mixture in a sintering device, and cooling after finishing sintering, to obtain a glass ceramic sintering body. The glass ceramic sintering body obtained according to the application has the advantages of relatively high volume density, relatively low nuclide leaching rate and the like, and the migration of the radioactive iodine in the natural world is excellently inhibited. In addition, according to the low-temperature curing method provided by the application, the silver coated silica gel particle containing radioactive iodine is directly mixed with the raw material powder of borate, the operation of sintering at the high temperature is eliminated, and the low-temperature curingmethod has the characteristics of simple craft process, energy saving, environment protection, safety, reliability and the like, and has an excellent industrial application prospect.

Description

technical field [0001] The invention relates to the field of radioactive waste treatment, in particular to a low-temperature curing method for silver-coated silica gel. Background technique [0002] Nuclear technology is favored by people as a clean and efficient energy source, but the development of nuclear energy is accompanied by the production of a large number of radioactive nuclides, which will produce various heavy ions and rays during the decay process, or pass through the food chain These behaviors can cause serious damage to organisms and threaten their survival. Among them, iodine-129 needs to be disposed of urgently because of its long half-life. At present, the treatment methods for radioactive iodine mainly include ocean disposal, cement, plastic, asphalt solidification, etc. Although these methods can dispose of radioactive iodine to a certain extent, there are problems such as poor stability of the solidified body and secondary pollution; and they cannot me...

Claims

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Application Information

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IPC IPC(8): G21F9/30
Inventor 卢喜瑞张振涛李炳生舒小艳刘刈陈顺彰魏贵林
Owner SOUTHWEAT UNIV OF SCI & TECH
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