Low-temperature non-calcination preparation method of pollucite

A cesium garnet, calcination-free technology, applied in the directions of aluminum silicate, silicate, etc., 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

Inactive Publication Date: 2019-05-03
SOUTHWEAT UNIV OF SCI & TECH
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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 (>1000°C), which inevitably leads to Causes Cs to volatilize at high temperature and corrode equipment, and the formed Cs airborne substances are also difficult to capture and collect, causing secondary pollution

Method used

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  • Low-temperature non-calcination preparation method of pollucite
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Embodiment 1

[0020] A low-temperature non-calcining preparation method of cesium garnet, the steps are: weighing aluminum-silicon raw materials and cesium hydroxide, mixing to obtain solid powder, so that the molar ratio of Cs:Al:Si=1:1:2; Mix evenly with water not exceeding 10% of the solid powder mass to obtain a water-containing solid mixture; the water-containing solid mixture is pressed into a tablet machine at 3-5MPa, and the demoulded sample is placed in a blast drying oven at 105 °C The dried sample was placed in an autoclave reactor, crystallized in a water vapor environment at a temperature of 120 °C for 24 h, and then cooled to take out the sample to obtain cesium garnet.

Embodiment 2

[0022] A low-temperature non-calcining preparation method of cesium garnet, the steps are: weighing aluminum-silicon raw materials and cesium hydroxide, mixing to obtain solid powder, so that the molar ratio of Cs:Al:Si=1:1:2; Mix evenly with water not exceeding 10% of the solid powder mass to obtain a water-containing solid mixture; the water-containing solid mixture is pressed into a tablet machine at 3-5MPa, and the demoulded sample is placed in a blast drying oven at 105 °C The dried sample was placed in an autoclaved reactor, crystallized in a water vapor environment at a temperature of 140 °C for 20 h, and then cooled to take out the sample to obtain cesium garnet.

Embodiment 3

[0024] A low-temperature non-calcining preparation method of cesium garnet, the steps are: weighing aluminum-silicon raw materials and cesium hydroxide, mixing to obtain solid powder, so that the molar ratio of Cs:Al:Si=1:1:2; Mix evenly with water not exceeding 10% of the solid powder mass to obtain a water-containing solid mixture; the water-containing solid mixture is pressed into a tablet machine at 3-5MPa, and the demoulded sample is placed in a blast drying oven at 105 °C The dried sample was placed in an autoclaved reactor, crystallized in a water vapor environment at a temperature of 160 °C for 16 h, and then cooled to take out the sample to obtain cesium garnet.

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Abstract

The invention discloses a low-temperature non-calcination preparation method of pollucite. The low-temperature non-calcination preparation method of the pollucite is characterized by comprising the steps of taking an aluminium and / or silicon raw material and cesium hydroxide, mixing the aluminium and / or silicon raw material and the cesium hydroxide to obtain solid powder, making a molar ratio of Cs to Al to Si in the solid powder equal to 1 to 1 to 2, mixing the solid powder and water which is less than or equal to 10% of the mass of the solid powder, conducting compression moulding on a water-containing solid mixture in a tablet machine at 3-5 MPa, then drying a specimen subjected to demolding, placing the dried specimen in a steam-pressing reaction kettle, conducting crystallization at 120-220 DEG C in a vapour environment for 4-24 h, and conducting cooling to prepare the pollucite. According to the low-temperature non-calcination preparation method of the pollucite, under mild conditions, low-temperature synthesis of the pollucite few in natural resource is achieved, and the situation that the Cs volatilizes at high temperature to pollute the environment is avoided; meanwhile, the prepared pollucite is good in crystallization and high in purity, and other crystal substance impure phases do not exist; and the prepared pollucite can be used as a cesium radioactive source corematerial, and can also be used as a high-temperature resistance material of the field of aerospace.

Description

technical field [0001] The invention belongs to the preparation of cesium-containing compounds, and relates to a low-temperature and non-calcining preparation method of cesium garnet. The inorganic solid material prepared by the invention-cesium garnet is suitable for use as source core material of radioactive source and high temperature resistant material in aerospace and other fields. Background technique [0002] Cesium garnet ideal chemical structure CsAlSi 2 o 6 , is the main natural mineral form of cesium that exists stably. Cesium garnet has high Cs content, excellent hydrothermal stability and high temperature resistance (melting point > 1900 ° C), etc., and can be used as source core material for radioactive sources, containing 137 Cs nuclear waste solidification and high-temperature-resistant ceramics for aerospace and other fields, but natural cesium garnet resources are scarce, and most of them are symbiotic with other silicate minerals. In the prior art, ...

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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