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Preparation method for strontium-cesium co-solidified body

A solidified body, strontium and cesium technology, applied in the direction of radioactive purification, nuclear engineering, etc., can solve the problems of easy volatilization, small Cs/Sr inclusion capacity, etc., to reduce volatilization, solve volatilization problems, ensure safety and operability Effect

Active Publication Date: 2011-10-05
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] It can be seen from the above research that most of the solidification methods of Sr and Cs are converted into glass or ceramic solidified bodies. Most of these methods need to be calcined at high temperature (greater than 1200 ° C), and cesium is easy to volatilize at temperatures higher than 1100 ° C; the United States The method of steam recombination is used to treat the Cs / Sr stream at 700°C, but the amount of clay required is 200% of the fully mineralized amount, and the Cs / Sr inclusion capacity is small

Method used

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  • Preparation method for strontium-cesium co-solidified body

Examples

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Embodiment 1

[0021] Dissolve strontium nitrate and cesium nitrate in deionized water respectively, prepare 0.5 mol / L strontium nitrate solution and 0.1 mol / L cesium nitrate solution, and prepare 0.1 mol / L nitric acid solution. In a beaker at room temperature, add 0.1mol / L HNO at a liquid-solid ratio of 10:1 3 and ZSM-5A molecular sieve, stirred for 10 hours, and centrifuged to obtain improved ZSM-5A molecular sieve; in a beaker, add 0.1mol / L of HNO 3Solution, add 0.5mol / L strontium nitrate solution according to the weight ratio of strontium oxide to the whole strontium-cesium co-solidified body as 5%, add 0.5mol / L cesium nitrate according to the weight ratio of cesium oxide to the whole strontium-cesium co-solidified body as 15% Solution, prepared as a mixed solution and placed in a beaker, then added improved ZSM-5A molecular sieve, wherein the solid-to-liquid ratio of ZSM-5A molecular sieve to the mixed solution was 1:3, stirred and left to stand for 10 hours, then stirred and evaporated...

Embodiment 2

[0024] Dissolve strontium nitrate and cesium nitrate in deionized water respectively to prepare 0.1mol / L strontium nitrate solution and 0.5mol / L cesium nitrate solution, and then prepare two nitric acid solutions of 0.01mol / L and 0.05mol / L. In a beaker at room temperature, add 0.05mol / L of HNO at a liquid-solid ratio of 10:1 3 solution and ZSM-5A molecular sieve, stirred for 8 hours, and centrifuged to obtain improved ZSM-5A molecular sieve; in a beaker, add 0.01mol / L of HNO 3 Solution, add 0.1mol / L strontium nitrate solution according to the weight ratio of strontium oxide to the whole strontium-cesium co-solidified body as 10%, add 0.5mol / L cesium nitrate according to the weight ratio of cesium oxide to the whole strontium-cesium co-solidified body Solution, prepared as a mixed solution and placed in a beaker, then added improved ZSM-5A molecular sieve, wherein the solid-to-liquid ratio of ZSM-5A molecular sieve to the mixed solution was 1:3, stirred and left to stand for 15...

Embodiment 3

[0026] Dissolve strontium nitrate and cesium nitrate in deionized water respectively to prepare 0.3 mol / L strontium nitrate solution and 0.3 mol / L cesium nitrate solution, and then prepare 0.05 mol / L and 0.08 mol / L nitric acid solutions. In a beaker at room temperature, add 0.08mol / L of HNO at a liquid-solid ratio of 10:1 3 solution and ZSM-5A molecular sieve, stirred for 7 hours, and centrifuged to obtain improved ZSM-5A molecular sieve; in a beaker, add 0.05mol / L of HNO 3 Solution, add 0.3mol / L strontium nitrate solution according to the weight ratio of strontium oxide to the whole strontium-cesium co-solidified body as 5%, add 0.3mol / L cesium nitrate according to the weight ratio of cesium oxide to the whole strontium-cesium co-solidified body as 15% solution, mix and place in a beaker, then add improved ZSM-5A molecular sieve, wherein the solid-to-liquid ratio of ZSM-5A molecular sieve to the mixed solution is 1:3, stir and age for 18 hours, then stir and evaporate, and th...

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Abstract

The invention belongs to the technical field of industrial treatment of nuclear waste and discloses a preparation method for a strontium-cesium co-solidified body. In the method, a modified ZSM-5 zeolite serves as a substrate to adsorb Sr and Cs; and the method comprises the following steps of: treating the ZSM-5 zeolite with a HNO3 solution; preparing a mixed solution of a strontium nitrate solution and a cesium nitrate solution in a ratio of 5 to 15 weight percent of strontium oxide and 5 to 15 weight percent of cesium oxide based on the strontium-cesium co-solidified body, adding the modified ZSM-5 zeolite, stirring, aging, standing, stirring, evaporating, and drying to obtain a strontium-cesium co-solidified precursor; and heating and calcining the strontium-cesium co-solidified precursor according to a certain process and cooling naturally to the room temperature to obtain a strontium-cesium solidified polycrystal. High-temperature calcining for preparing the co-solidified body is avoided, so that the problem of Cs volatilization is solved, the aim of solidifying Sr at the same time is fulfilled and the experimental safety and operability under a radioactive condition are ensured; and the method is applicable for solidifying the strontium solution and the cesium solution which are separated from the unclear waste.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste industrial treatment, and in particular relates to a preparation method of a strontium-cesium co-solidified body. Background technique [0002] High-level waste liquid is the 1AW waste liquid discharged from the reprocessing PUREX process. It concentrates more than 95% of the radioactivity in the spent fuel, and contains residual uranium and plutonium (about 0.5-0.25%), minor actinides (Minor Actinides, namely MA) neptunium, americium, curium and long-lived fission elements are highly radioactive and highly toxic waste liquids, and there is no ideal industrial treatment technology at present. High-level liquid waste is the most harmful and most difficult waste to manage during the application of nuclear energy (J.J.Laidler and J.C.Bresee. The U.S. Advanced Fuel Cycle Initiative: Development of Separation Technologies.Proc.Int.Cnf.for Advances for Nuclear Fuel Cycles, ATalante 2004, Nimes, F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/16G21F9/06G21F9/12G21F9/20G21F9/08G21F9/14
Inventor 文明芬陈靖王建晨
Owner TSINGHUA UNIV
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