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Preparation method of microcrystalline glass for treating radioactive cesium contaminated soil

A technology of glass-ceramic and polluted soil, applied in the restoration of polluted soil and other directions, can solve the problems of affecting the compactness and stability of glass network structure, unsatisfactory curing effect, etc., achieving obvious curing effect, easy control of production process, The effect of good application prospects

Inactive Publication Date: 2020-04-10
(CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solidified body is vitrified solidified body, but glass is always in a thermodynamically metastable state, and has a tendency to spontaneously precipitate uncontrollable crystals. During geological disposal, it will be seriously affected by long-term radiation, high temperature, humidity and other environmental influences. Density and stability of glass network structure
[0006] The existing methods for treating radioactive cesium-contaminated soil mainly include organic / inorganic composite adsorption method (CN201710297852.5), hydrothermal method (CN201410735155.X, CN201610081478.0), hydrophilic resin adsorption method (CN201280064939.3, CN201480009436.5 , CN201380005974.2), but these methods are mainly adsorption methods, the curing effect is not ideal, and only for a single radioactive cesium element, cesium contaminated soil also contains a small amount of actinide and lanthanide radioactive elements

Method used

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  • Preparation method of microcrystalline glass for treating radioactive cesium contaminated soil
  • Preparation method of microcrystalline glass for treating radioactive cesium contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Cesium hydroxide monohydrate (CsOH.H 2 O) 40.84g (simulated radionuclide) was dissolved in 43.60g silica sol with a mass concentration of 30%, and cesium silicate solution was obtained after mechanical stirring for 12 hours;

[0023] 2. Add 29.26g of metakaolin powder (simulated soil) to the cesium silicate solution, stir mechanically for 60 minutes, pour the slurry into the mold, put it in an oven and let it stand for 5 days at a temperature of 60°C to obtain a lump Solid, pulverizing and grinding the massive solid to obtain a cesium-containing precursor powder;

[0024] 3. The dried analytically pure SiO 2 55g, Al 2 o 3 4GB 2 o 3 17g, Na 2 CO 3 19g, CaCO 3 After 5g is ground and mixed evenly, pour it into a crucible, put the crucible into a muffle furnace, melt at a temperature of 1400°C for 2 hours at a heating rate of 10°C / min, and then shape and cool to obtain borosilicate glass , grinding borosilicate glass into borosilicate glass powder;

[0025] 4...

Embodiment 2

[0027] 1. Cesium hydroxide monohydrate (CsOH.H 2 O) 61.26g (simulated radionuclide) was dissolved in 65.40g silica sol with a mass concentration of 30%, and a cesium silicate solution was obtained after mechanical stirring for 24 hours;

[0028] 2. Add 43.89g of metakaolin powder (simulated soil) to the cesium silicate solution, stir mechanically for 90 minutes, pour the slurry into the mold, put it in an oven and let it stand for 7 days at a temperature of 70°C to obtain a lump Solid, pulverizing and grinding the massive solid to obtain a cesium-containing precursor powder;

[0029] 3. The dried analytically pure SiO 2 58g, Al 2 o 3 4GB 2 o 3 15g, Na 2 CO 3 16g, CaCO 3 After 7g is ground and mixed evenly, pour it into a crucible, put the crucible into a muffle furnace, melt at a temperature of 1500 °C for 2 hours at a heating rate of 10 °C / min, and then form and cool to obtain borosilicate glass , grinding borosilicate glass into borosilicate glass powder;

[003...

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Abstract

The invention relates to a preparation method of microcrystalline glass for treating radioactive cesium contaminated soil, which is characterized by comprising the following steps: (1) dissolving cesium hydroxide monohydrate in 20-40% silica sol according to the molar ratio of cesium metal ions to silicon atoms of 1: 2, and stirring for 12-24 hours to obtain a cesium silicate solution; (2) addingmetakaolin powder, controlling the molar ratio of silicon ions to aluminum ions to be 2: 1, stirring for 60-90min, pouring an obtained mixture into a mold, standing at 60-90 DEG C for 5-7 days to obtain a blocky solid, and grinding to obtain cesium-containing precursor powder; (3) mixing the following raw materials in percentage by weight: 50-65% of SiO2, 4-8% of Al2O3, 15-20% of B2O3, 15-25% of Na2CO3 and 8-10% of CaCO3, melting, forming, cooling to prepare glass, and grinding into glass powder; and (4) mixing the cesium-containing precursor powder and glass powder according to a mass ratio of 1: (4-5), melting at 1000-1200 DEG C for 2-5 hours, molding, and cooling. The preparation method has the beneficial effects of simple process, low melting temperature and easiness in process control; the chemical stability is good, the curing effect is obvious, and the leaching resistance rate is high.

Description

technical field [0001] The invention relates to the field of radioactive-contaminated soil treatment, in particular to a method for preparing a glass-ceramic for treating radioactive cesium-contaminated soil. [0002] technical background [0003] As a highly efficient and clean energy with relatively mature technology, nuclear energy has positive and far-reaching significance for the country to adjust its energy structure, ensure energy security, promote energy conservation and emission reduction, and respond to climate change. While the rapid development of nuclear energy has benefited mankind, it has also left behind a large amount of radioactively polluted soil. The radionuclides in the soil will cause harm to the life and health of animals, plants and human beings. Due to the diversity of radionuclides and the complexity of soil composition, the treatment and remediation of radioactively contaminated soil has become a difficult problem at present. [0004] In 2011, the...

Claims

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Application Information

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IPC IPC(8): C03C10/10C03B32/02B09C1/00
CPCB09C1/00C03B32/02C03C10/0018
Inventor 彭寿杨勇石丽芬张正义孙扬善单传丽王萍萍冯良周刚王巍巍曹欣王田禾马立云
Owner (CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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