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A kind of low-temperature curing method of 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 stability, etc., and achieve good industrial application prospects, low iodine leaching rate, thermal The effect of low release rate

Active Publication Date: 2020-09-18
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Radioactive iodine is mainly converted into silver iodide after adsorption, but the silica gel particles themselves are easily affected by external environmental factors such as pressure, temperature, humidity, etc., resulting in deformation of the solidified body and affecting its stability, which cannot meet the long-term disposal of radioactive iodine.

Method used

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  • A kind of low-temperature curing method of silver-coated silica gel
  • A kind of low-temperature curing method of silver-coated silica gel
  • A kind of low-temperature curing method of silver-coated silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 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:

[0067] (1) 9.778g silica gel, 2.223gAgI, 4.581gSiO 2 , 11.359gB 2 o 3 , 8.472gBi 2 o 3 , 5.587g ZnO was added with deionized water and placed in a colloid mill to fully grind for 24 hours, evaporated and dried at 100°C for 6 hours to obtain a dry mixture;

[0068] (2) the dry mixture is pre-pressed at 10MPa to obtain a block-like dry mixture;

[0069] (3) Put the block-shaped dry mixture into a high-temperature muffle furnace, raise the temperature from room temperature to 550°C, keep it at 550°C for 6 hours, then cool it down to 200°C at a cooling rate of 1°C / min, and then cool it naturally to room temperature , to obtain a borate glass ceramic sintered body containing iodine-coated silver silica gel.

[0070] After the sample was taken out, the bulk density of the borate glass cer...

Embodiment 2

[0072] 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:

[0073] (1) 0.518g silica gel, 1.482gAgI, 2.376gSiO 2 , 0.597gB 2 o 3 , 3.029gBi 2 o 3 , 1.998g ZnO was added to deionized water and placed in a colloid mill to grind for 28 hours, evaporated and dried at 100°C for 6 hours to obtain a dry mixture;

[0074] (2) the dry mixture is pre-pressed at 15MPa to obtain a block-like dry mixture;

[0075] (3) Put the block-shaped dry mixture into a high-temperature muffle furnace, raise the temperature from room temperature to 550°C, keep it at 550°C for 6 hours, then cool it down to 200°C at a cooling rate of 2°C / min, and then cool it naturally to room temperature , to obtain a borate glass ceramic sintered body containing iodine-coated silver silica gel.

[0076] After the sample was taken out, the bulk density of the borate glass ceramic sint...

Embodiment 3

[0084] Such as figure 1 As shown, this embodiment discloses a curing device for implementing the method of the present application, and the curing device includes:

[0085] Silver-coated silica gel particle filter mechanism 3;

[0086] Colloid mill 4, used for mixing and grinding silver-coated silica gel particles and solidified substrate raw material powder;

[0087] Drying device 5, is used for receiving the wet mixture from colloid mill 4, and to mixture drying, obtains dry mixture;

[0088] The second sintering device 6 is used for sintering the dried mixture.

[0089] The second sintering device 6 may be equipment such as a high-temperature muffle furnace or a microwave sintering furnace.

[0090] Such as figure 2 As shown, the silver-coated silica gel particle filter mechanism 3 includes:

[0091] weighing scale 8;

[0092] The first funnel 10 is arranged directly above the weighing scale 8;

[0093] Filter screen 11 is installed in the first funnel 10;

[0094]...

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Abstract

The invention discloses a low-temperature curing method for silver-coated silica gel. The low-temperature curing method comprises the following steps: mixing silver-coated silica gel particles containing radioactive iodine and curing base material raw material powder, adding deionized water, and grinding, so as to obtain a humidified mixture, wherein the curing base material raw material powder contains B2O3, Bi2O3, ZnO and SiO2; drying the humidified mixture, so as to obtain the dried mixture; and putting the dried mixture into a sintering device, sintering, and cooling, so as to obtain a glass ceramic sintered body. The glass ceramic sintered body prepared by virtue of the method has the advantages of relatively low curing temperature, low iodine leaching rate and heat release rate and the like and can be used for well processing the dispersion of radioactive iodine in environment. Besides, the silver-coated silica gel particles containing radioactive iodine are directly mixed with the curing base material raw material powder, the high-temperature sintering operation is not required, so that the low-temperature curing method has the advantages of simple craft process, energy saving, environmental friendliness, safety, reliability and the like and has good industrial application prospects.

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] Exhaust gases containing iodine-129 are produced during the reprocessing of spent fuel. Since iodine-129 has a longer half-life and is more active in chemical properties, iodine-129 is easy to accumulate in the organism and cause long-term damage to it. At present, the elemental iodine and organic iodine in the waste gas are mainly adsorbed by silver-coated silica gel. Silver-coated silica gel is obtained by placing silica gel particles in AgNO3 solution. The silver-coated silica gel containing radioactive iodine is cured to For long-term storage purposes. Radioactive iodine is mainly converted into silver iodide after adsorption, but the silica gel particles themselves are easily affected by external environmental factors such as pressure, temperature, and humidity, resulting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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