Treatment method of radioactive iodine waste

A technology of radioactive iodine and a treatment method, which is applied in the field of radioactive iodine waste treatment, can solve the problems of secondary pollution, poor stability of the solidified body, and cannot satisfy the long-term disposal of radioactive iodine, etc., and achieves the effect of a simple process.

Active Publication Date: 2019-11-12
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can dispose of radioactive iodine to a certain extent, there are problems such as poor stabilit...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the processing of radioactive iodine waste (one)

[0019] Adopt the following method steps to carry out the processing of radioactive iodine waste:

[0020] (1) 280g of radioactive iodine waste (the source is gaseous I discharged from nuclear waste) 2 ) react with 80g sodium hydroxide to obtain radioactive iodine waste conversion product powder.

[0021] (2) Mix 45g of 4A zeolite with 55g of radioactive iodine waste conversion powder, grind in a colloid mill (Langfang Guantong Machinery Co., Ltd., JF-130 type), dry at 80°C for 12h, weigh, add deionized Water (the mass ratio of solid to liquid is 1:10) is further ground, refined and homogenized to obtain a wet and uniform mixture (the average particle size of the solidified product is 1 μm).

[0022] (3) The wet and uniform mixture is hydrolyzed and evaporated to dryness in a muffle furnace (Tianjin Test Instrument Co., Ltd., MFLC-7 / 12P type) (temperature is 200 ° C, time is 60 min), then heated and sinte...

Embodiment 2

[0024] Embodiment 2: the processing of radioactive iodine waste (two)

[0025] Adopt the following method steps to carry out the processing of radioactive iodine waste:

[0026] (1) 280g of radioactive iodine waste (the source is gaseous I discharged from nuclear waste) 2 ) react with 120g sodium hydroxide to obtain radioactive iodine waste conversion product powder.

[0027] (2) Mix 65g of 4A zeolite with 35g of radioactive iodine waste conversion powder, grind in a colloid mill (Langfang Guantong Machinery Co., Ltd., JF-130 type), dry at 80°C for 12h, weigh, add deionized Water (the mass ratio of solid to liquid is 1:5) is further subjected to grinding, refinement, and homogenization treatment to obtain a wet and uniform mixture (the average particle size of the cured product is 5 μm).

[0028] (3) The wet and uniform mixture is hydrolyzed and evaporated to dryness in a muffle furnace (Tianjin Test Instrument Co., Ltd., MFLC-7 / 12P type) (temperature is 250 ° C, time is 10 ...

Embodiment 3

[0030] Embodiment 3: the processing of radioactive iodine waste (three)

[0031] Adopt the following method steps to carry out the processing of radioactive iodine waste:

[0032] (1) 320g radioactive iodine waste (the source is the gaseous I discharged in the nuclear waste) 2 ) react with 80g sodium hydroxide to obtain radioactive iodine waste conversion product powder.

[0033] (2) Mix 50g of 4A zeolite with 50g of radioactive iodine waste conversion powder, grind in a colloid mill (Langfang Guantong Machinery Co., Ltd., JF-130 type), dry at 80°C for 12h, weigh, add deionized Water (the mass ratio of solid to liquid is 1:8) is further subjected to grinding, refinement, and homogenization treatment to obtain a wet and uniform mixture (the average particle size of the cured product is 3 μm).

[0034] (3) The wet and uniform mixture is hydrolyzed and evaporated to dryness in a muffle furnace (Tianjin Test Instrument Co., Ltd., MFLC-7 / 12P type) (temperature is 220 ° C, time is...

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Abstract

The invention belongs to the technical field of radioactive waste treatment, and relates to a treatment method of radioactive iodine waste. The treating method sequentially comprises the following steps: (1) the radioactive iodine waste reacts with sodium hydroxide, and radioactive iodine waste conversion product powder is obtained; (2) 4A zeolite and the radioactive iodine waste conversion product powder are mixed and then ground, and after drying and weighing, deionized water is added for further grinding, refining and homogenizing treatment, a uniformly wetted mixture is obtained; and (3) the uniformly wetted mixture is hydrolyzed, evaporated to be dry and then subjected to heating sintering, and an iodine sodalite solidified body is obtained. Through the treatment method of the radioactive iodine waste, the radioactive iodine waste can be treated in the modes of simple technological process, energy conservation, environment protection, safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment and relates to a treatment method for radioactive iodine waste. Background technique [0002] The rapid development of nuclear energy is accompanied by the generation of a large amount of nuclear waste, among which radioactive iodine-129 / 131 etc. are usually represented by I - , IO 3 - , I 2 , IO - or CH 3 Forms such as I volatilize, causing pollution to the environment and affecting human health. [0003] In the early days of the development of the nuclear industry, radioactive iodine was fixed by adsorption. For example, Tang Lijuan from Fudan University and others used silver-coated silica gel to adsorb radioactive waste gas containing radioactive iodine-129 / 131. Although this approach is useful for I 2 and CH 3 The removal efficiency of I reaches more than 99.99%, but the obtained iodine-containing silver-coated silica gel particles are easily affected by ambient te...

Claims

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Application Information

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IPC IPC(8): G21F9/02
CPCG21F9/02
Inventor 张振涛刘刈彭琳孙润杰魏桂林闫萌陈艳张羽马梅花龙泊康
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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