A kind of radioactive pollution graphite incineration process

A radioactive and graphite technology, which is applied in the field of radioactive waste treatment and disposal, can solve the problems of incineration ash not being properly disposed of, combustion product TiC increasing in volume and weight, affecting the smooth operation of the incinerator, etc. Achieve temperature controllable and complete, factory application value significant effect

Active Publication Date: 2022-03-15
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The main disadvantage of this incineration technology is: the temperature of the incinerator fluctuates greatly with the degree of graphite combustion in the furnace and the supply flow of air, which affects the smooth operation of the incinerator; the accumulation of incineration ash at the bottom of the furnace will seriously block the supply of air. Thus, the incineration process may be interrupted; there is a large amount of incineration dust diffusion in the incineration process; the incineration ash produced by incineration has not been properly disposed of and can only be temporarily stored
Its disadvantage is: in the combustion process, TiO 2 It will react with graphite to form ceramic TiC. Although graphite is fixed on the ceramic lattice, the combustion product TiC increases in volume and weight, which is contrary to the principle of "waste minimization" followed by the nuclear industry.

Method used

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  • A kind of radioactive pollution graphite incineration process
  • A kind of radioactive pollution graphite incineration process
  • A kind of radioactive pollution graphite incineration process

Examples

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Effect test

Embodiment 1

[0060] A kind of radioactive pollution graphite incineration process, it comprises the following steps:

[0061] The first step, crushing and granulation of radioactive graphite:

[0062] Step 1, crushing and sieving: crush the radioactive graphite, and then sieve small graphite particles with a particle size of less than 1mm;

[0063] Step 2, material mixing: mix the granulation aid or the previous batch of incineration ash with the small graphite particles obtained in step 1 to obtain the mixed material, and control the moisture content of the mixed material so as to facilitate the extrusion molding of step 3; wherein, making Granulation aids include graphite oxidation aids and granulation binders, graphite oxidation aids are Fe 3 o 4 , the granulation binder is SiO 2 、Al 2 o 3 , or one or any combination of two or more in CaO; wherein, the weight ratio of the graphite oxidation aid and the granulation binder is 1:4 to 6, and the weight ratio of the graphite oxidation a...

Embodiment 2

[0088] A kind of radioactive pollution graphite incineration process, it comprises the following steps:

[0089] The first step, crushing and granulation of radioactive graphite:

[0090] Step 1, crushing and sieving: crush the radioactive graphite, and then sieve small graphite particles with a particle size of less than 1 mm;

[0091] Step 2, material mixing: mix the granulation aid with the small graphite particles obtained in step 1 to obtain the mixed material, and control the moisture of the mixed material so as to facilitate the extrusion molding of step 3; wherein the granulation aid includes graphite oxide Auxiliary and granulation binder, graphite oxidation auxiliary is Fe 3 o 4 , the granulation binder is Al 2 o 3 Wherein, the weight ratio of graphite oxidation auxiliary agent and granulation adhesive is 1:4~6, and the weight ratio of graphite oxidation auxiliary agent and granulation adhesive can not only guarantee that more difficult-to-combustible graphite is...

Embodiment 3

[0116] A kind of radioactive pollution graphite incineration process, it comprises the following steps:

[0117] The first step, crushing and granulation of radioactive graphite:

[0118] Step 1, crushing and sieving: crush the radioactive graphite, and then sieve small graphite particles with a particle size of less than 1 mm;

[0119] Step 2, material mixing: mix the previous batch of incineration ash with the small graphite particles obtained in step 1 to obtain a mixed material, and control the moisture content of the mixed material so as to facilitate extrusion molding in step 3; wherein, the granulation aid includes graphite Oxidation aid and granulation binder, graphite oxidation aid is Fe 3 o 4 , the granulation binder is SiO 2 Wherein, the weight ratio of graphite oxidation auxiliary agent and granulation adhesive is 1:4~6, and the weight ratio of graphite oxidation auxiliary agent and granulation adhesive can not only guarantee that more difficult-to-combustible g...

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Abstract

The invention relates to the technical field of radioactive waste treatment and disposal, in particular to a radioactive contaminated graphite incineration process. A radioactive contaminated graphite incineration process, including: the first step, the crushing and granulation of radioactive graphite; the second step, the incineration of granulated graphite; the third step, vitrification in the barrel of incineration ash: step one, the incineration ash Barrel and compaction; Step 2, vitrification in the barrel; Step 3, disposal as low-level waste. The radioactively contaminated graphite incineration process adopts the technical route of crushing the radioactive graphite first and then adding granulation aids or granulation of the previous batch of incineration ash, and then incinerating. The addition of granulation aids achieves stable combustion of graphite and eliminates In addition, the method of vitrification in the barrel is used to realize the safe disposal of incineration ash and solve the problem of safe disposal of incineration ash. Therefore, the radioactive contaminated graphite incineration process has significant technological progress and is of great application value in factories. significantly.

Description

technical field [0001] The invention relates to the technical field of radioactive waste treatment and disposal, in particular to a radioactive contaminated graphite incineration process. Background technique [0002] Radioactively contaminated graphite is widely produced in nuclear reactor decommissioning, nuclear technology applications and other fields. For the treatment and disposal of radioactively contaminated graphite, technologies such as fixed bed direct incineration technology and self-propagating ceramic treatment have been developed. However, due to many problems in these technologies, their practical application is limited. [0003] In the prior art, the fixed bed incineration technology adopts the method of crushing graphite into different particles, and then putting it into a fixed bed incinerator for direct incineration. The main disadvantage of this incineration technology is: the temperature of the incinerator fluctuates greatly with the degree of graphite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/30G21F9/32G21F9/36
CPCG21F9/32G21F9/305G21F9/36
Inventor 谢华王烈林罗杰
Owner SOUTHWEAT UNIV OF SCI & TECH
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