Self-propagating preparation method for Gd<2>Ti<2-x>Zr<x>O<7> pyrochlore

A self-propagating, pyrochlore technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve the problems of unfavorable large-scale promotion of pyrochlore solidification process, long synthesis cycle, complex synthesis process, etc., to achieve guaranteed Stability and long-term safety, high product density and high product purity

Inactive Publication Date: 2017-07-28
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These synthesis processes are relatively complicated and the synthesis cycle is long, w

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  • Self-propagating preparation method for Gd&lt;2&gt;Ti&lt;2-x&gt;Zr&lt;x&gt;O&lt;7&gt; pyrochlore
  • Self-propagating preparation method for Gd&lt;2&gt;Ti&lt;2-x&gt;Zr&lt;x&gt;O&lt;7&gt; pyrochlore
  • Self-propagating preparation method for Gd&lt;2&gt;Ti&lt;2-x&gt;Zr&lt;x&gt;O&lt;7&gt; pyrochlore

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Experimental program
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Embodiment 1

[0049] a Gd 2 Ti 2-x Zr x o 7 The self-propagating preparation method of pyrochlore comprises the following process steps:

[0050] (1) Using Ti as the reducing agent and CuO as the oxidizing agent, the ingredients are prepared according to the following reaction equation (I):

[0051] 3Ti+0.4TiO 2 +0.6ZrO 2 +2Gd 2 o 3 +6CuO=2Gd 2 Ti 1.7 Zr 0.3 o 7 +6Cu (I)

[0052] The molar ratio of each reactant raw material is Ti:TiO 2 : ZrO 2 :Gd 2 o 3 : CuO =15:2:3:10:30, according to their molecular weight and content, the corresponding mass percentage content is: Ti: 10.1%, TiO 2 : 2.25%, ZrO 2 : 5.2%, Gd 2 o 3 : 50.99%, CuO: 31.46%;

[0053] (2) Dry ball mill the above components for 30 minutes, mix them evenly, pass through a 100-mesh sieve to obtain a mixture, put it in an oven, and dry it at 80°C for 30 minutes. Take 20g of the mixture and put it into a Φ25mm stainless steel mold, press the mixture into a cylindrical blank 1 with a diameter of 25mm and a thickn...

Embodiment 2

[0057] a Gd 2 Ti 2-x Zr x o 7 The self-propagating preparation method of pyrochlore comprises the following process steps:

[0058] (1) Using Ti as the reducing agent and CuO as the oxidizing agent, the ingredients are prepared according to the following reaction equation (II):

[0059] 3Ti+ZrO 2 +2Gd 2 o 3 +6CuO=2Gd 2 Ti 1.5 Zr 0.5 o 7 +6Cu (Ⅱ)

[0060] The molar ratio of each reactant raw material is Ti: ZrO 2 :Gd 2 o 3 : CuO=3:1:2:6, according to their molecular weight and content, the corresponding mass percentage content is: Ti: 9.77%, ZrO 2 : 8.39%, Gd 2 o 3 : 49.35%, CuO: 30.45%;

[0061] (2) Dry the raw materials of the above components for 30 minutes, mix them evenly, pass through a 100-mesh sieve to obtain the mixture, put it in an oven, and dry it at 80°C for 30 minutes. Take 20g of the mixture and put it into a Φ25mm stainless steel mold, press the mixture into a cylindrical blank 1 with a diameter of 25mm and a thickness of about 20mm by using a ...

Embodiment 3

[0065] a Gd 2 Ti 2-x Zr x o 7 The self-propagating preparation method of pyrochlore comprises the following process steps:

[0066] (1) Use Ti as the reducing agent and CuO as the oxidizing agent, and mix according to the reaction equation (II):

[0067] 13Ti+7ZrO 2 +10Gd 2 o 3 +26CuO=10Gd 2 Ti 1.3 Zr 0.7 o 7 +26Cu (Ⅱ)

[0068] The molar ratio of each reactant raw material is Ti: ZrO 2 :Gd 2 o 3 : CuO=13:7:10:26, according to their molecular weight and content, the corresponding mass percentage is: Ti: 8.67%, ZrO 2 : 12.02%, Gd 2 o 3 : 50.50%, CuO: 28.81%;

[0069] (2) Dry the raw materials of the above components for 30 minutes, mix them evenly, pass through a 100-mesh sieve to obtain the mixture, put it in an oven, and dry it at 80°C for 30 minutes. Take 20g of the mixture and put it into a Φ25mm stainless steel mold, press the mixture into a cylindrical blank 1 with a diameter of 25mm and a thickness of about 20mm by using a pressure of 20MPa;

[0070] (3...

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Abstract

The invention discloses a self-propagating preparation method for Gd<2>Ti<2-x>Zr<x>O<7> pyrochlore. The self-propagating preparation method is characterized by including acquiring Ti, TiO<2>, ZrO<2>, Gd<2>O<3> and CuO powder to be used as raw materials according to certain proportions; carrying out dry ball milling, uniform mixing and drying on the raw materials and compressing the raw materials to obtain blanks; placing the blanks in self-propagating quasi-isostatic pressure devices, igniting the blanks by the aid of ignition devices to carry out reaction and applying pressures after combustion is completed to obtain the Gd<2>Ti<2-x>Zr<x>O<7> pyrochlore. The self-propagating preparation method has the advantages that self-propagating high-temperature synthesis is combined with fast densification processes, and accordingly pyrochlore-type man-made rock densification solidified bodies which are high in thermal stability and chemical stability and excellent in anti-irradiation property can be synthesized in a few minutes; the self-propagating preparation method is high in synthesis speed, production efficiency, reaction temperature and product purity, low in energy consumption and applicable to long-term safety solidification treatment and disposal on nuclide of actinium series in high-level radioactive waste, processes are simple, and the like.

Description

technical field [0001] The invention belongs to the preparation of artificial rocks used in the solidification treatment of radioactive waste in the field of environmental protection, and relates to a Gd 2 Ti 2-x Zr x o 7 Self-propagating preparation method of pyrochlore. Pyrochlore-type artificial rock prepared by the present invention—Gd 2 Ti 2-x Zr x o 7 Pyrochlore is especially suitable for long-term safe solidification treatment and disposal of actinide nuclides in high-level radioactive waste. Background technique [0002] The treatment and disposal of radioactive waste is a key link in the development of the nuclear industry. At present, the treatment and disposal technology of low- and medium-level radioactive waste is relatively mature, and the treatment of high-level radioactive waste (HLW for short) is still the focus and difficulty of radioactive waste disposal at home and abroad. Artificial rock is used as the solidified substrate for the second-generati...

Claims

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Application Information

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IPC IPC(8): C01G23/00
CPCC01G23/003C01P2002/72
Inventor 张魁宝何宗胜彭乐尹丹李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH
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