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Low-temperature curing method for glass ceramic silver-coating silica gel

A glass-ceramic and curing method technology, applied in radioactive purification, nuclear engineering and other directions, can solve problems such as the inability to handle radioactive iodine for a long time, the deformation of the solidified body affects the stability, etc., and achieves good industrial application prospects, low iodine leaching rate, solidification low temperature effect

Active Publication Date: 2019-05-21
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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  • Low-temperature curing method for glass ceramic silver-coating silica gel
  • Low-temperature curing method for glass ceramic silver-coating silica gel
  • Low-temperature curing method for glass ceramic silver-coating silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] In this example, the common iodine-127 is used to simulate the radionuclide iodine-129. A low-temperature curing method for glass ceramics coated with silver silica gel, comprising the following steps:

[0087] (1) 0.916gSiO 2 , 2.272gB 2 o 3 , 1.694gBi 2 o 3 , 1.118g ZnO was added with deionized water and placed in a colloid mill for 24 hours, then evaporated and dried at 100°C for 6 hours to obtain a glass-ceramic sintered substrate, and the glass-ceramic sintered substrate was placed in a high-temperature muffle furnace, Sintering to obtain glass-ceramic, put glass-ceramic into agate mortar and grind to obtain glass-ceramic powder;

[0088] (2) Add deionized water to the obtained glass ceramic powder, 2.518g silica gel and 1.482g AgI, put it in a colloid mill and grind it thoroughly for 24 hours, then evaporate and dry at 100°C for 6 hours to obtain a dried mixture;

[0089] (3) The dry mixture is pre-pressed at 10MPa to obtain a block-shaped dry mixture;

[0...

Embodiment 2

[0093] In this example, the common iodine-127 is used to simulate the radionuclide iodine-129. A low-temperature curing method for glass ceramics coated with silver silica gel, comprising the following steps:

[0094] (1) 1.782gSiO 2 , 0.448gB 2 o 3 , 2.272gBi 2 o 3 , 1.498g of ZnO was added with deionized water and placed in a colloid mill for 24 hours and then evaporated and dried at 100°C for 6 hours to obtain a glass-ceramic sintered substrate. Put the glass-ceramic sintered substrate into a high-temperature muffle furnace, Sintering to obtain glass-ceramic, put glass-ceramic into agate mortar and grind to obtain glass-ceramic powder;

[0095] (2) Add the obtained glass ceramic powder, 2.518g of silica gel and 1.482g of AgI into deionized water, place it in a colloid mill and grind it thoroughly for 30 hours, then evaporate and dry at 100°C for 6 hours to obtain a dry mixture;

[0096] (3) The dry mixture is pre-pressed at 10MPa to obtain a block-like dry mixture;

...

Embodiment 3

[0107] 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:

[0108] The first colloid mill 39 is used for grinding B2O3, Bi2O3, ZnO and SiO2;

[0109] The first drying device 40 is used to receive the raw material from the first colloid mill 39 and dry the raw material;

[0110] The first sintering device 1 is used to sinter the raw materials dried by the first drying device 40 to obtain glass ceramics;

[0111] Glass-ceramic grinding device 2, for grinding glass-ceramic into glass-ceramic powder;

[0112] Silver-coated silica gel particle filter mechanism 3;

[0113] The second colloid mill 4 is used for mixing and grinding silver-coated silica gel particles and glass ceramic powder;

[0114] The second drying device 5 is used to receive the wet mixture from the second colloid mill 4, and dry the mixture to obtain a dry mixture;

[0115] The second sintering device 6 ...

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Abstract

The invention discloses a low-temperature curing method for glass ceramic silver-coating silica gel. The method comprises the following steps that silver-coating silica gel particles containing radioactive iodine and glass ceramic powder are mixed, deionized water is added for grinding, and a humid moisture is obtained, wherein the glass ceramic is composed of B2O3, Bi2O3, ZnO and SiO2; the humidmixture is dried and processed to obtain a dried mixture; the dried mixture is placed into a sintering device for sintering, after sintering is completed, cooling is performed to obtain a glass ceramic sintering body. The obtained glass ceramic sintering body has the advantages of being low in curing temperature, low in iodine leaching efficiency, low in heat release rate, and dispersion of radioactive iodine in the environment can be well processed. The method has the advantages of being simple in technological process, saving energy, being environmentally friendly, safe and reliable and thelike, and has the good 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 glass ceramics. 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 iodine element and organic iodine in the exhaust gas are mainly adsorbed by silver-coated silica gel. The silver-coated silica gel is to place silica gel particles on AgNO 3 The particles obtained in the solution are cured by silver-coated silica gel containing radioactive iodine to achieve long-term storage. 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, temp...

Claims

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Application Information

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IPC IPC(8): C03C14/00C03C10/00G21F9/30
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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