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A kind of preparation method of rare earth titanate pyrochlore powder

A rare earth titanate, stone powder technology, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of unfavorable large-scale promotion of pyrochlore solidification process, complex synthesis process, long synthesis cycle, etc. The effect of containing a wide range of elements, high product purity and fast synthesis speed

Inactive Publication Date: 2016-09-14
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These synthesis processes are relatively complicated and the synthesis cycle is long, which is not conducive to the large-scale promotion of pyrochlore solidification process

Method used

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  • A kind of preparation method of rare earth titanate pyrochlore powder
  • A kind of preparation method of rare earth titanate pyrochlore powder
  • A kind of preparation method of rare earth titanate pyrochlore powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of high-purity titanate pyrochlore powder, the process steps are as follows:

[0037] a. Preparation:

[0038] Fe with particle size less than 200 mesh 2 o 3 , Y 2 o 3 , Ti powder as raw material, Fe in molar ratio 2 o 3 : Y 2 o 3 : Ti = 4:3:6 Take each raw material, mix the raw materials and dry ball mill for 2 hours, the powder after ball milling is passed through a 100-mesh sieve, and the under-sieve is the evenly mixed mixture; take 30g of the mixture and put it into the mold (It is better to use a stainless steel mould), using a pressure of 10MPa to press the mixture into a cylindrical green body with a diameter of 30mm and a thickness of about 18mm, which is ready for use;

[0039] b. Self-propagating high-temperature synthesis:

[0040] A self-propagating high-temperature synthesis device is adopted. The composition of the device includes an ignition tungsten wire 3, and a stainless steel mold 1 composed of a bottom, an annular side ...

Embodiment 2

[0047] A preparation method of rare earth titanate pyrochlore powder, characterized in that the steps are:

[0048] a. Preparation:

[0049] CuO, Y with particle size less than 200 mesh 2 o 3 , Ti, TiO 2 The powder is the raw material, and the molar ratio is CuO:Y 2 o 3 :Ti:TiO 2 = 6:2:3:1 Take each raw material, mix the raw materials and dry ball mill for 10 hours, the powder after ball milling is passed through a 100-mesh sieve, and the under-sieve is the evenly mixed mixture; take 50g of the mixture and put it into the mold In the process, the mixture is pressed and formed (cold-formed) with a pressure of 20 MPa into a cylindrical green body with a diameter of 40 mm and a thickness of about 19 mm, which is ready for use;

[0050] b. Self-propagating high-temperature synthesis:

[0051] A self-propagating high-temperature synthesis device is adopted. The composition of the device includes an ignition tungsten wire 3, and a stainless steel mold 1 composed of a bottom, ...

Embodiment 3

[0058] A preparation method of rare earth titanate pyrochlore powder, the steps are:

[0059] a. Preparation:

[0060] Fe with particle size less than 200 mesh 2 o 3 、A 2 o 3 , Ti powder as raw material, Fe in molar ratio 2 o 3 : A 2 o 3 : Ti = 4:3:6 Take each raw material, mix the raw materials and dry ball mill for 1 hour, the powder after ball milling is passed through a 100-mesh sieve, and the under-sieve is the evenly mixed mixture; take 10g of the mixture and put it into the mold (It is better to use a stainless steel mold), use 5MPa pressure to press the mixture into a cylindrical green body with a diameter of 20mm and a thickness of about 17mm, and set aside;

[0061] b. Self-propagating high-temperature synthesis:

[0062] A self-propagating high-temperature synthesis device is adopted. The composition of the device includes an ignition tungsten wire 3, and a stainless steel mold 1 composed of a bottom, an annular side wall and an upper pressure head; an alum...

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Abstract

The invention discloses a preparation method of a rare-earth titanate pyrochlore powder, which is characterized by comprising the following steps: proportionally preparing Fe2O3, A2O3 and Ti powders or CuO, A2O3, Ti and TiO2 powders as raw materials, evenly mixing, passing through a 100-mesh screen, taking 10-50g of the mixture, evenly mixing the raw materials, and compacting; putting the formed billet in a self-propagating high-temperature synthesizer, and igniting a tungsten wire to initiate the billet reaction, thereby obtaining a loose porous rare-earth titanate pyrochlore / metal complex phase block; and crushing the block by ball milling, soaking in dilute nitric acid, filtering, washing the solid with deionized water, drying, and pulverizing to obtain the high-purity rare-earth titanate pyrochlore powder. The self-propagating high-temperature synthesis / acid pickling combination technique for preparing the rare-earth titanate pyrochlore powder for long-term safe solidifying treatment and disposition of high-level active nucleus waste has the characteristics of high speed, high efficiency, high product purity, low energy consumption, simple process and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to solidification treatment of high-level radioactive waste, and in particular relates to a preparation method of rare earth titanate pyrochlore powder. The rare earth titanate pyrochlore powder prepared by the invention is especially suitable for long-term safe solidification treatment and disposal of actinide nuclides in high-level waste. Background technique [0002] High-level radioactive waste (HLW for short) is the focus and difficulty of radioactive waste treatment at home and abroad. Pyrochlore can fix the long-lived actinide nuclide atoms in HLW in its lattice structure, thereby greatly improving the stability of the solidified body And long-term security, it is an ideal HLW curing medium. Self-propagating high-temperature synthesis (SHS for short) is an important new technology for material preparation. It uses the exothermic heat of the chemical reaction to mainta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
Inventor 张魁宝文冠军李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH