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High-temperature self-propagating solidifying method for radioactive graphite

A technology of high-temperature self-propagation and solidification method, which is applied in the fields of radioactive purification and nuclear engineering

Inactive Publication Date: 2012-07-18
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many researches on radioactive waste treatment using this technology in foreign countries, but there are relatively few domestic researches on this aspect. In the literature, only Zhang Ruizhu, a senior engineer at the University of Science and Technology Beijing, took the lead in using SHS technology to carry out SrTiO 3 preparation of high-level radioactive waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Example 1. Graphite, aluminum, titanium dioxide and simulated radioactive graphite (2% by mole of strontium, 3% by mole of cerium, and 3% by mole of neodymium) are used as raw materials. Adjust the formula so that the molar ratio of graphite to titanium dioxide is 0.8:1.2, the molar ratio of aluminum to titanium dioxide is 0.8:1.2, and the molar ratio of graphite to radioactive substances (strontium, cerium and neodymium) is 1:0.1. According to the ratio of raw materials to grinding balls of 1:2, zirconium dioxide (ZrO 2 ) balls, and dry milled in a ball mill for 2 hrs in a ball mill. Then, under the pressure of 8 MPa, the mixed and finely processed raw materials were pre-pressed into discs with a diameter of 13 mm. A tungsten wire is used to ignite the molded sample at ~1500 °C, the sample burns by itself and then cools to room temperature to obtain a radioactive graphite solidified body.

example 2

[0011] Example 2. Graphite, aluminum, titanium dioxide and simulated radioactive graphite (the molar percentage of strontium is 8%, and the molar percentage of cerium is 2%) are used as raw materials. Adjust the formula so that the molar ratio of graphite to titanium dioxide is 1.2:0.8, the molar ratio of aluminum to titanium dioxide is 1.2:0.8, and the molar ratio of graphite to radioactive substances (strontium, cerium and neodymium) is 1:0.03. According to the ratio of raw materials to grinding balls of 1:2.5, zirconium dioxide (ZrO 2 ) balls, and dry milled in a ball mill for 15 hrs in a ball mill. Then, under a pressure of 15 MPa, the mixed and finely processed raw materials were pre-pressed into discs with a diameter of 13 mm. The molded sample was ignited by chemical ignition (ignition temperature ~ 3000 ℃), the sample ignited by itself and then cooled to room temperature to obtain a radioactive graphite solidified body.

example 3

[0012] Example 3. Graphite, aluminum, titanium dioxide and simulated radioactive graphite (28 mole percent strontium, 2 mole percent cerium, and 3 mole percent neodymium) are used as raw materials. Adjust the formula so that the molar ratio of graphite to titanium dioxide is 1:1, the molar ratio of aluminum to titanium dioxide is 1:1, and the molar ratio of graphite to radioactive substances (strontium, cerium and neodymium) is 1:0.3. According to the ratio of raw materials to grinding balls of 1:2, zirconium dioxide (ZrO 2 ) balls, and dry milled in a ball mill for 5 hrs in a ball mill. Then, under a pressure of 10 MPa, the mixed and finely processed raw materials were pre-pressed into discs with a diameter of 13 mm. A tungsten wire is used to ignite the molded sample at ~1800 °C, the sample burns by itself and then cools to room temperature to obtain a radioactive graphite solidified body.

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Abstract

The invention discloses a high-temperature self-propagating solidifying method for radioactive graphite, which includes: firstly analyzing components and contents of the components of the radioactive graphite; designing formula of a solidified body by utilizing graphite, aluminum, titanium dioxide and the radioactive graphite as raw materials; mixing, refining and prepressing the raw materials; igniting formed samples at the temperature ranging from 1500 DEG C to 3000 DEG C and finally obtaining the radioactive graphite solidified body to realize solidifying after the samples are burned automatically. The high-temperature self-propagating solidifying method is simple in operation, high in production efficiency, fine in repeatability and capable of massively disposing radioactive graphite discharged from the relevant fields, such as nuclear power plants and the like.

Description

technical field [0001] The invention relates to graphite, in particular to a method for treating large-capacity radioactive waste using radioactive graphite as a raw material. Background technique [0002] High-temperature self-propagating reaction (Self-propagating-High-temperature Synthesis, SHS), also known as self-propagating reaction or combustion synthesis (Combustion synthesis), refers to the ignition of raw materials in a high vacuum or medium atmosphere to initiate a chemical reaction, and the chemical reaction releases The heat causes the temperature of adjacent materials to rise suddenly, causing a new chemical reaction and spreading to the entire reactant in the form of combustion wave. When the combustion wave advances, the reactant reacts to obtain the product. In 1953, the article "Self-propagating Process of Strong Exothermic Chemical Reaction" put forward the concept of self-propagating for the first time. In 1992, Wiley et al. published the characteristics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/32G21F9/34
Inventor 卢喜瑞易发成陈梦君崔春龙唐敬友段涛王哲
Owner SOUTHWEAT UNIV OF SCI & TECH
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