Method for preparing high radioactive waste curing treatment base material

A high-radioactive, solidification treatment technology, which is applied in the preparation of substrates for solidification treatment of high-level radioactive waste, and in the field of solidification treatment of high-level radioactive waste, can solve the problems of expensive raw materials, low purity of target minerals, unfavorable engineering applications, etc., and achieve simplification Curing treatment process, low cost of curing treatment, beneficial to engineering application

Inactive Publication Date: 2006-05-03
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0008] (1) with ZrO 2 , ZrOCl 2 The introduction of Zr in the form of raw materials such as zirconium alkoxide, etc., the price of raw materials is expensive, which is not conducive to engineering applications;
[0009] (2) It is synthesized by the liquid phase method, the process is complex, the process control requirements are high, and secondary pollution is prone to occur in the actual solidification of radioactive waste;
[0010] (3) with ZrO 2 Zr is introduced in the form of Zr, and high-temperature solid-state reaction is used to synthesize perovskite zircon. Since the raw material itself is very stable and the synthesis temperature is high, the purity of the target mineral obtained is low, and the performance of the solidified body is poor.

Method used

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  • Method for preparing high radioactive waste curing treatment base material

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Effect test

Embodiment 1

[0037] A method for preparing a base material for solidification treatment of high-level radioactive waste, comprising the following steps:

[0038] (1) Ingredients: natural zircon, CaCO 3 and TiO 2 As raw materials, according to natural zircon 28g, CaCO 3 33g, TiO 2 The ratio of 40g is taken from each raw material;

[0039] (2) Fine grinding: put each raw material into fine grinding equipment (for example: vibration mill), add grinding balls, vibrate and grind for 30-60 minutes to obtain powder with fine particle size and uniform composition;

[0040] (3) Calcination: calcining the material at a temperature of 1150°C to 1350°C (or 1260°C to 1320°C) for 20 to 60 minutes to obtain the product—high-purity perovskite zircon (CaZrTi 2 o 7 ) and titanite (CaTiSiO 5 ).

Embodiment 2

[0042] A method for preparing a base material for solidification treatment of high-level radioactive waste, comprising the following steps:

[0043] (1) Ingredients: natural zircon, CaCO 3 and TiO 2 As raw materials, according to natural zircon 30g, CaCO 3 31g, TiO 2 The ratio of 38g is taken from each raw material;

[0044] (2) Fine grinding: put each raw material into fine grinding equipment (for example: vibration mill), add grinding balls, and vibrate for 30-60 minutes;

[0045] (3) Powder granulation: adding the polyvinyl alcohol (polymerization degree 2000-8000, the same as the prior art) hydrosol of 10-20% concentration by weight in the powder after fine grinding is used as an adhesive, and the addition amount It is 5-8% of the weight of the finely ground powder, and it is ground and granulated;

[0046] (4) Compression forming: the powder material after granulation is packed in the steel mold, on the hydraulic press, adopt 30-60MPa pressure compression molding t...

Embodiment 3

[0049] A method for preparing a high-level radioactive waste solidified body, comprising the following steps:

[0050] (1) Ingredients: natural zircon, CaCO 3 and TiO 2 As raw materials, according to natural zircon 30g, CaCO 3 31g, TiO 2 Take each raw material at a ratio of 38g; and add 20g of radioactive waste;

[0051] Other steps and processing conditions are with embodiment 1 or embodiment 2, omit.

[0052] After calcining, the artificial rock solidified body in which high radioactive waste has been solidified in the lattice of perovskite zircon and sphene crystals is obtained, and the solidified body has good long-term safety.

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Abstract

The invention relates to a method for preparing high radioactivity waste solidification treating base material which comprises the following steps: preparing the material: using nature hyacinth, CaCO3 and TiO2 as raw material and extracting them by weight ration: nature hyacinth: CaCO3:TiO2 =26-32:29-35:35-42; correct grinding: loading each raw material into the correct grinding device, adding the grinding ball to do correct grinding 30-60 minutes; burning: burning at the temperature 1150 deg. to 1350 deg. 20-60 minutes to obtain the product.

Description

technical field [0001] The invention relates to the treatment of radioactive waste, in particular to a method for preparing a base material for solidification treatment of high-level radioactive waste. The method prepares perovskite zircon (CaZrTi 2 o 7 ), titanite (CaTiSiO 5 )-based minerals, especially suitable for solidification of high-level radioactive waste. Background technique [0002] The radioactive waste produced by various nuclear reactors, nuclear power plants and other devices is quite harmful and cannot be discharged directly to the environment. It must be solidified by a suitable method and stored in isolation by an appropriate device until the radioactive elements in it decay to no effect on the environment. up to the hazard. The solidification treatment and disposal technology of low-level radioactive waste is relatively mature and has been widely used. The solidification treatment and disposal technology of high-level radioactive waste is still in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/00G21F9/16
Inventor 滕元成周时光车春霞
Owner SOUTHWEAT UNIV OF SCI & TECH
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