Method for preparing solidified bodies on basis of cesium-adsorbed silicon-based heteropolyacid salt composite adsorbents

A composite adsorption and heteropolyacid technology, applied in radioactive purification, nuclear engineering and other directions, can solve the problems of poor compatibility of phosphorus elements, limit the practical application of heteropolyacid salt inorganic adsorbents, etc., and achieve high fixation rate and good adsorption. And capture ability, anti-leaching performance superior effect

Active Publication Date: 2016-12-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are almost no reports on the solidification of heteropoly acid salt adsorption materials, which limits the practical application of heteropoly acid salt inorganic adsorbents in the field of radioactive waste
On the other hand, the phosphorus element in the heteropoly acid salt has poor compatibility with the glass solidified body, so it is necessary to find a safe solidification method

Method used

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  • Method for preparing solidified bodies on basis of cesium-adsorbed silicon-based heteropolyacid salt composite adsorbents
  • Method for preparing solidified bodies on basis of cesium-adsorbed silicon-based heteropolyacid salt composite adsorbents

Examples

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Effect test

Embodiment 1

[0021] The silicon-based ammonium phosphomolybdate composite adsorbent after adsorbing cesium and allophane (main component: SiO 2 78.78%, Al 2 o 3 12.39%, Fe 2 o 3 3.51%, K 2 O 1.64%, Na 2 O 0.48%) were ground and mixed at a mass ratio of 1:0.5, 1:2, and 1:4, and then placed in a cylindrical abrasive tool and pressed at 40Mpa, and then sintered at 800°C in a high-temperature muffle furnace. Hours, annealed to room temperature to obtain a ceramic solidified body.

[0022] figure 1 It is the X-ray diffraction pattern of the cesium-containing ceramic solidified body sintered under the conditions of different proportions of the samples of this embodiment. Depend on figure 1 It can be seen that after sintering at 800 degrees, the structure of ammonium phosphomolybdate has collapsed, forming stable cesium aluminum silicate (PDF: 41-0569), aluminosilicate (PDF: 15-0776) and silicon dioxide ( PDF: 39-1425) mixed crystals, as the proportion of allophane increases, the inte...

Embodiment 2

[0024] The silica-based ammonium molybdate composite adsorbent after adsorbing cesium and allophane (main component: SiO 2 78.78%, Al 2 o 3 12.39%, Fe 2 o 3 3.51%, K 2 O 1.64%, Na 2 O 0.48%) with a mass ratio of 1:1 to grind and mix evenly, place it in a cylindrical abrasive tool and press it at 45Mpa, then sinter in a high-temperature muffle furnace at 900, 1000, and 1200 degrees for 2 hours, and anneal After reaching room temperature, a ceramic solidified body is obtained. Cured body X-ray diffraction pattern and figure 1 Similarities are no longer listed. After sintering at 900 degrees, the structure of ammonium phosphomolybdate has collapsed, forming a stable cesium aluminum silicate, aluminosilicate and silicon dioxide mixed crystals. After sintering at 1000 and 1200 degrees, the intensity of diffraction peaks increases, the degree of crystallinity is higher, and a more complete mixed crystalline substance is formed. X-ray fluorescence analysis was carried out ...

Embodiment 3

[0026] The silicon-based ammonium phosphotungstate composite adsorbent after adsorbing cesium and natural mordenite (main component: SiO 2 81.31%, Al 2 o 3 12.51%, Fe2 o 3 1.96%, K 2 O 1.25%, Na 2 O 0.65%) with a mass ratio of 1:0.8, 1:1.5, 1:2.5 to grind and mix evenly, place it in a cylindrical abrasive tool and press it at 50Mpa, and then sinter it in a high-temperature muffle furnace at 1300 degrees. Hours, annealed to room temperature to obtain a ceramic solidified body.

[0027] figure 2 It is the X-ray diffraction pattern of the cesium-containing ceramic solidified body sintered under different ratio conditions for the sample of this embodiment. Depend on figure 2 It can be seen that after sintering at 1300 degrees, the structure of ammonium phosphotungstate has collapsed, forming stable cesium aluminosilicate crystals (PDF: 41-0569) and crystalline silicon dioxide (PDF: 39-1425) Mixed crystal ceramic solidified body. X-ray fluorescence analysis was carried...

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Abstract

The invention discloses a method for preparing solidified bodies on the basis of cesium-adsorbed silicon-based heteropolyacid salt composite adsorbents. The method includes particular steps of firstly, mixing solidifying base materials and the cesium-adsorbed silicon-based heteropolyacid salt composite adsorbents with one another to obtain mixtures and uniformly grinding the mixtures; secondly, carrying out static-pressure molding on the ground mixtures to obtain molded blanks; thirdly, calcining the molded blanks at the high temperatures of 800-1500 DEG C for 2-5 hours and annealing the molded blanks until the temperatures of the molded blanks reach the room temperature to obtain the cesium-containing ceramic solidified bodies. The solidifying base materials are selectively one or two types of allophane or zeolite materials. The method has the advantages that the solidifying materials such as allophane or zeolite are low in price and are easily available, processes for preparing the solidified bodies are simple, good cesium immobilization effects can be realized by the solidified bodies, the solidified bodies are high in strength and low in leaching rate, the method is applicable to solidifying and treating cesium-containing radioactive waste, and the like.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and relates to a method for preparing a solidified body based on a silicon-based heteropolyacid salt composite adsorbent after absorbing cesium. Background technique [0002] As a clean and high-quality energy, nuclear energy plays a very important role in alleviating the pressure of energy shortage, reducing environmental pollution, and improving the energy structure. However, in the process of nuclear energy development, radioactive contaminated wastewater will inevitably be produced. Especially after the Fukushima nuclear accident in Japan, the society and the public put forward higher requirements for nuclear safety and radioactive pollution prevention and control. The Fukushima nuclear accident resulted in the generation of hundreds of thousands of tons of radioactive contaminated wastewater, which directly threatened human health and environmental safety (Q Zhang, B Wan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/00G21F9/30
CPCG21F9/001G21F9/301
Inventor 吴艳韦悦周张晓霞
Owner SHANGHAI JIAO TONG UNIV
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