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Self-propagating solidifying method for radioactive contaminated sandy soil

A solidification method and self-propagating technology, which are used in the solidification treatment of sand and the self-propagating solidification of radioactively polluted sand, can solve the problems of destructive damage to the treated ecosystem, long repair time, and high plant requirements, so as to improve the resistance to Leaching performance, good effect, good treatment effect

Inactive Publication Date: 2018-05-11
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's treatment methods for radioactively contaminated sand mainly include physical landfill and phytoremediation. The former is time-consuming and labor-intensive, and will cause devastating damage to the ecological system of the treatment site. Causes further diffusion of pollutants, and the latter phytoremediation method has higher requirements on plants and takes longer to repair

Method used

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  • Self-propagating solidifying method for radioactive contaminated sandy soil
  • Self-propagating solidifying method for radioactive contaminated sandy soil
  • Self-propagating solidifying method for radioactive contaminated sandy soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for self-propagating solidification of radioactively contaminated sand, comprising the following process steps:

[0032] (1) Using Ti as the reducing agent and CuO as the oxidizing agent, the ingredients are prepared according to the following reaction equation:

[0033] 4CuO + CaO + 2Ti + ZrO 2 = CaZrTi 2 o 7 + 4Cu ( )

[0034] The molar ratio of each reactant in the reaction formula is CuO: CaO: Ti: ZrO 2 =4:1:2:1; according to their molecular weight and content, the corresponding mass percentage content is: CuO: 48.27%, CaO: 8.5%, Ti: 14.53%, ZrO 2: 18.7%; the remaining 10% is sand (i.e. radioactively contaminated sand) content; then the main component is SiO 2 The radioactively contaminated sand should make the radioactively contaminated sand account for 10wt.% of the total material mass.

[0035] (2) The raw materials of the above components CuO, CaO, Ti, ZrO 2 Mix with contaminated sand and dry ball mill for 10 minutes, mix evenly to obtain a m...

Embodiment 2

[0042] A method for self-propagating solidification of radioactively contaminated sand, comprising the following process steps:

[0043] (1) Using Ti as the reducing agent and CuO as the oxidizing agent, the ingredients are prepared according to the following reaction equation:

[0044] 4CuO + CaO + 2Ti + ZrO 2 = CaZrTi 2 o 7 + 4Cu ( )

[0045] By CuO:CaO:Ti:ZrO 2 = 4:1:2:1 molar ratio to take raw materials CuO, CaO, Ti and ZrO 2 Powder;

[0046] Described raw material is by above-mentioned CuO, CaO, Ti and ZrO 2 The solidification system is composed of powder; the radioactive contaminated sand and solidification system are taken according to the mass percentage of 10% to 20% of the radioactive contaminated sand and 80% to 90% of the solidification system;

[0047] (2) The raw materials of the above components CuO, CaO, Ti, ZrO 2 and radioactive contaminated sand by dry ball milling for 30 minutes, mix evenly to obtain a mixture, put the mixture in an oven, and dry...

Embodiment 3

[0054] A method for self-propagating solidification of radioactively contaminated sand comprises the following steps of preparing the radioactively polluted sand into a solidified body of radioactive sand:

[0055] a. Ingredients: according to CuO: CaO: Ti: ZrO 2 = 4:1:2:1 molar ratio to take raw materials CuO, CaO, Ti and ZrO 2 Powder;

[0056] Described raw material is by above-mentioned CuO, CaO, Ti and ZrO 2 The solidification system is composed of powder; the radioactive contaminated sand and the solidification system are taken according to the mass percentage of 12% of the radioactive contaminated sand and 88% of the solidification system;

[0057] b. Mixing materials: mix the above radioactive contaminated sand with solidification system raw materials (CuO, CaO, Ti and ZrO 2 Powder) mixed, dry ball milled for 15 minutes, mixed evenly, passed through a 20-mesh sieve to obtain a mixture, and dried the mixture (in an oven or other drying equipment) at a temperature of 7...

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Abstract

The invention discloses a self-propagating solidifying method for radioactive contaminated sandy soil. The method is characterized in that a radioactive sandy soil solidified body is prepared from theradioactive contaminated sandy soil, and the method includes the following steps: taking raw materials according to the molar ratio of CuO to CaO to Ti to ZrO2 of 4:1:2:1, adding the radioactive contaminated sandy soil which accounts for the total mass of 10%-20%, performing dry ball milling, performing sieving, performing drying, and performing pressing to obtain a blank material; and placing the blank material into a self-propagating quasi-isostatic pressure device, and performing self-propagating high-temperature synthesis to make the radioactive contaminated sandy soil solidified into a high-thermal-stability, high-chemical-stability zirconolite-typed compact man-made rock. The method provided by the invention has the advantages of a rapid synthetic speed, high production efficiency,high reaction temperature, low energy consumption, a simple process and the like, and the method provided by the invention is particularly suitable for the safe solidifying treatment and disposal of the radioactive contaminated sandy soil.

Description

technical field [0001] The invention belongs to the preparation of artificial rocks used in the solidification treatment of radioactive waste in the field of environmental protection, and relates to a self-propagating solidification method of radioactive polluted sandy soil, which is suitable for the solidification treatment of radioactive nuclide polluted sandy soil. Background technique [0002] The treatment and disposal of radioactive waste is a key link in the development of the nuclear industry. At present, the treatment and disposal technology of low- and medium-level radioactive waste is relatively mature, and the treatment of high-level radioactive waste (HLW for short) is still the focus and difficulty of radioactive waste disposal at home and abroad. In general radioactive waste, there are not many irrelevant substances introduced into the solidification system by the waste itself, but for radioactive contaminated sand, sand is an inseparable main substance and mus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/30
CPCG21F9/302
Inventor 张魁宝薛佳利彭乐尹丹李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH
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