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Preparation method of microcrystalline pollucite

A cesium garnet and microcrystalline technology, applied in the directions of aluminum silicate and silicate, can solve the problems of difficult capture and collection of Cs airborne substances, high temperature volatilization of Cs, and high synthesis temperature, which is beneficial to environmental protection and avoids high temperature. The effect of volatilization and simple preparation process

Active Publication Date: 2015-04-22
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the preparation methods of cesium garnet mainly include high-temperature solid-phase method, sol-gel method, and zeolite precursor method. The synthesis temperature required by the prior art method is relatively high, which will inevitably cause high-temperature volatilization of Cs and corrosion. equipment, the Cs airborne matter formed by it is also difficult to capture and collect, causing secondary pollution

Method used

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  • Preparation method of microcrystalline pollucite
  • Preparation method of microcrystalline pollucite
  • Preparation method of microcrystalline pollucite

Examples

Experimental program
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Effect test

Embodiment 1

[0024] According to the mass ratio of cesium hydroxide and potassium silicate solution is 0.3:1 weighing ratio, cesium hydroxide is dissolved in potassium silicate solution, stirred and dissolved, cooled to room temperature to form potassium cesium silicate solution; potassium cesium silicate After the solution is cooled, metakaolin is added according to the mass ratio of potassium cesium silicate solution to metakaolin at 1.2:1, and stirred evenly to form a slurry; the slurry is poured into a steel mold, sealed at room temperature for 3 to 5 hours, and then demoulded. Blocky solid; blocky solid is placed in an autoclaved reactor, crystallized in a steam environment of 180°C and 0.8MPa for 4 to 8 hours, and then cooled to obtain a blocky solid of microcrystalline cesium garnet.

Embodiment 2

[0026] According to the mass ratio of cesium hydroxide and potassium silicate solution is 0.47:1 weighing ratio, cesium hydroxide is dissolved in potassium silicate solution, stirred and dissolved, cooled to room temperature to form potassium cesium silicate solution; potassium cesium silicate After the solution is cooled, metakaolin is added according to the mass ratio of potassium cesium silicate solution to metakaolin at 1.27:1, stirred evenly to form a slurry; the slurry is poured into a steel mold, sealed at room temperature for 3 to 5 hours, and then demolded into a Blocky solid; blocky solid is placed in an autoclaved reactor, crystallized in a steam environment of 180°C and 0.8MPa for 4 to 8 hours, and then cooled to obtain a blocky solid of microcrystalline cesium garnet.

Embodiment 3

[0028] According to the mass ratio of cesium hydroxide and potassium silicate solution is 0.67:1 weighing ratio, cesium hydroxide is dissolved in potassium silicate solution, stirred and dissolved, cooled to room temperature to form potassium cesium silicate solution; potassium cesium silicate After the solution is cooled, metakaolin is added according to the mass ratio of potassium cesium silicate solution to metakaolin is 1.44:1, stirred evenly to form a slurry; the slurry is poured into a steel mold, sealed at room temperature for 3 to 5 hours, and then demolded into a Blocky solid; blocky solid is placed in an autoclaved reactor, crystallized in a steam environment of 180°C and 0.8MPa for 4 to 8 hours, and then cooled to obtain a blocky solid of microcrystalline cesium garnet.

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Abstract

The invention discloses a preparation method of microcrystalline pollucite. The method comprises the following steps: dissolving cesium hydroxide in a potassium silicate solution, and cooling to room temperature to obtain a cesium potassium silicate solution; adding metakaolin to the cesium potassium silicate solution, and uniformly stirring to obtain a slurry; injecting the slurry to a steel die, carrying out closed standing at room temperature for 3-5h, and demolding to obtain a solid block; and placing the solid block in a steam autoclave, crystallizing in water steam environment with the temperature of 180DEG C and the pressure of 0.8MPa, and cooling to prepare the microcrystalline pollucite. The method realizes the low temperature synthesis of naturally scarce pollucite pollucite under mild conditions, and avoids harms of high temperature volatilization of Cs and environment pollution; and the prepared microcrystalline pollucite can be used in solidified cesium-containing radioactive wastes, can be used as a radiation source core material, can also be used in high temperature resistant materials in the aviation and aerospace field, and can be widely used in the fields of national defense and military industry.

Description

technical field [0001] The invention belongs to the preparation of cesium-containing compounds, and relates to a preparation method of microcrystalline cesium garnet. The inorganic solid material prepared by the present invention-microcrystalline cesium garnet is suitable for adsorption catalysis, source core material of radioactive source, containing 137 Cs nuclear waste solidification materials, and high temperature resistant materials in aerospace and other fields. Background technique [0002] Cesium garnet (chemical formula CsAlSi 2 o 6 .nH 2 O), also known as cesium zeolite, is the main natural mineral form of cesium (Cs) that exists stably, and its crystal structure is composed of (Al, Si) O 4 The framework of the tetrahedral network structure is composed of Cs ions distributed in parallel channels in the <111> direction, which can theoretically accommodate more than 40wt% of Cs. Cesium garnet has high Cs content, excellent hydrothermal stability and high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 李军侯莉卢忠远
Owner SOUTHWEAT UNIV OF SCI & TECH
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