Method of synthesizing strontium titanate solid nuclear waste material

A technology of strontium titanate and nuclear waste, applied in the field of effective treatment of radioactive waste rich in strontium nuclides, to achieve the effects of low leaching rate, high density and high Vickers hardness

Inactive Publication Date: 2006-01-11
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The invention provides the preparation of strontium titanate (SrTiO 3 ) solidified high-level waste strontium nuclides (Sr 2+ ) method, which fundamentally solves the problem of nuclear waste containment capacity

Method used

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  • Method of synthesizing strontium titanate solid nuclear waste material
  • Method of synthesizing strontium titanate solid nuclear waste material

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Experimental program
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Embodiment Construction

[0017] In this test, chromium trioxide, titanium powder, strontium oxide, and titanium dioxide are used as raw materials, and chromium trioxide is used as an oxidant. The reaction equation is as follows

[0018] (1)

[0019] First, put the raw materials required for the reaction into a stainless steel ball mill and grind them to below 70 μm, and press CrO after sieving 3 , Ti, SrO and TiO 2 The molar ratio is 2:3:4:1 mixed powder. According to their molecular weight and content, the mass percentage can be calculated as 23.86:17.14:49.46:9.54; mix the powder according to the mass percentage calculated above, put it into a ball mill jar, and ball mill for 30 minutes, then take out the powder and pour it into a dark seal bottle, store in a cool dry place.

[0020] Take 30g of the mixed material and put it into a mold with a diameter of Φ25mm×a height of 180mm, pressurize 200Mpa on a YA-10 hydraulic press to make a compact, and then take out the compact. Extend the l...

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Abstract

The invention provides a method for using self-spread high temperature synthesis technology to produce strontium titanate solidified radioactive nuclide. It uses CrO3 as the oxidant, the reaction formula is: 2CrO3+3Ti+4SrO+TiO2=4SrTiO3+2Cr+Q. the process method: the reaction material ball grinded into the one with particle size less than 70 micro meter, the CrO3, Ti, SrO and TiO2 are blended according to mol ratio 2:3:4:1 after being sifted, and they are produced into pressed cog. The pressed cog is put into the self-spread high temperature synthesis static pressure reactor device and the put into the powder compound chemical reacting media; it induces the exothermic chemical reaction of the media, uses its high speed heat release to heat the sample to high temperature, and induces the integral real-time combustion synthesis in the sample. The strontium titanate can be acquired after the reaction, takes out the sample after being cooled.

Description

Technical field: [0001] The invention belongs to the field of environmental protection, in particular for the effective treatment of radioactive waste rich in strontium nuclides. Background technique: [0002] Self-propagating high-temperature synthesis is a new technology for preparing materials by exothermic chemical reaction itself. Its most notable feature is to make full use of the high-energy exothermic reaction when forming compounds between elements. In addition to the small amount of external energy necessary to initiate the synthesis reaction, the entire reaction process is mainly maintained by the heat release of the material itself. Therefore, it can greatly save energy. In addition, it also has outstanding advantages such as short synthesis time, high product purity, less pollution, and integration of material synthesis and sintering. [0003] Since the invention of the Russian scholar Merzhanov in 1967, the self-propagating combustion synthesis has been devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/28C22C1/05
Inventor 郭志猛张瑞珠李燏林涛魏延平
Owner UNIV OF SCI & TECH BEIJING
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