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Preparation method for zirconolite type manmade rock

A perovskite-zircon-type artificial rock technology, which is applied in the field of (rapid) preparation of perovskite-zircon-type artificial rocks, can solve the problem of long synthesis period, complicated perovskite-zircon synthesis process, unfavorable Issues such as the large-scale promotion of rock solidification technology to achieve the effect of increasing the containment capacity, ensuring stability and long-term safety

Inactive Publication Date: 2015-04-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the synthesis process of perovskite-zircon is relatively complicated and the synthesis cycle is long, which is not conducive to the large-scale promotion of perovskite-zircon artificial rock solidification process

Method used

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  • Preparation method for zirconolite type manmade rock
  • Preparation method for zirconolite type manmade rock
  • Preparation method for zirconolite type manmade rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A (rapid) preparation method of perovskite zircon type artificial rock, comprising the following process steps:

[0045] (1) Use CuO powder as the oxidant and Ti powder as the reducing agent, and mix according to the reaction equation:

[0046] 6CuO+2CaO+3Ti+TiO 2 +2ZrO 2 =2CaZrTi 2 o 7 +6Cu

[0047] The molar ratio of each reactant is CuO: CaO: Ti: TiO 2 : ZrO 2 =6:2:3:1:2, according to their molecular weight and content, the corresponding mass percentages are: CuO: 45.1%, CaO: 10.6%, Ti: 13.5%, TiO 2 : 7.5%, ZrO 2 : 23.3%.

[0048] (2) Dry grind the weighed raw materials for 20 minutes to mix them evenly, pass the mixed materials through a 100-mesh sieve, take 25g of fully ground raw materials, put them into a Φ30mm steel mold, and cold press them under a pressure of 40MPa to obtain a diameter A cylindrical blank with a diameter of 30mm and a thickness of about 22mm.

[0049] (3) Put the prepared rough billet into the self-propagating quasi-i...

Embodiment 2

[0052] A (rapid) preparation method of perovskite zircon type artificial rock, comprising the following process steps:

[0053] (1) Use CuO powder as the oxidizing agent and Ti powder as the reducing agent, and mix according to the reaction equation:

[0054] 2CuO+CaO+Ti+TiO 2 +ZrO 2 =CaZrTi 2 o 7 +2Cu

[0055] The molar ratio of each reactant is CuO: CaO: Ti: TiO 2 : ZrO 2 =2:1:1:1:1,

[0056] According to their respective molecular weights and contents, the corresponding mass percentages are: CuO: 34.1%,

[0057] CaO: 12.1%, Ti: 10.3%, TiO 2 : 17.1%, ZrO 2 : 26.4%.

[0058] (2) Dry grind the weighed raw materials for 25 minutes to mix them evenly. Pass the mixed materials through a 100-mesh sieve, take 30g of fully ground raw materials and put them into a Φ40mm steel mold, and cold press them under 20MPa pressure to obtain diameter A cylindrical blank with a diameter of 40mm and a thickness of about 18mm.

[0059] (3) Put the prepared rough billet...

Embodiment 3

[0062] A method for preparing perovskite zircon type artificial rock, comprising the following steps:

[0063] a. Ingredients: according to CuO: CaO: Ti: TiO 2 : ZrO 2 = 6:2:3:1:2 molar ratio (preferably purity higher than 99%, particle size less than 200 mesh) CuO, CaO, Ti, TiO 2 , ZrO 2 Powder as raw material; according to their molecular weight and content, the corresponding mass percentages are: CuO: 45.1%, CaO: 10.6%, Ti: 13.5%, TiO 2 : 7.5%, ZrO 2 : 23.3%.

[0064] b. Abrasives: dry ball mill the above components for 10 minutes, mix them evenly, and pass through 100 sieves to obtain a mixture;

[0065] c. Rough billet compression molding: take 10g of the mixture and put it into a stainless steel mold (cylindrical mold of Φ20mm), and press the mixture into a cylindrical blank 2 with a diameter of 20mm by using a pressure of 10MPa;

[0066] d. Self-propagating high-temperature synthesis and (rapid) densification of perovskite-zircon artificial rocks:

[0067] Adop...

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Abstract

The invention discloses a preparation method for a zirconolite type manmade rock. The preparation method is characterized by comprising the following steps: preparing materials from CuO powder, CaO powder, Ti powder, TiO2 powder and ZrO2 powder; performing dry-process ball-milling on the raw materials, uniformly mixing the raw materials and enabling the raw materials to pass through a 100-mesh sieve; feeding 10-50g of the mixed materials into a stainless steel mould, and pressing the mixed materials into cylindrical blank; introducing the blank into a self-propagating quasi-isostatic device, igniting the blank through a tungsten filament to react, and applying pressure of 50-200MPa after the combustion reaction is ended, thereby preparing the high-compactness zirconolite type manmade rock. The preparation method disclosed by the invention can be used for synthesizing the zirconolite type manmade rock within several minutes by adopting a self-propagating high-temperature combined quick compacting process, has the advantages of being high in synthesis speed, high in efficiency, high in reaction temperature, high in product purity, low in energy consumption, simple, and the like; the prepared zirconolite type manmade rock is suitable for long-term safety solidification treatment and disposal of actinide in high-level waste.

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 (rapid) preparation method of perovskite-zircon type artificial rocks. The perovskite-zircon artificial rock prepared by the invention is particularly suitable for long-term safe solidification treatment and disposal of actinide nuclides in high-level radioactive waste. Background technique [0002] High-level radioactive waste (HLW for short) is the focus and difficulty of radioactive waste treatment at home and abroad. Perovskite zircon can fix the long-lived actinide nuclide atoms in HLW in its lattice structure, thereby greatly improving the stability of the solidified body. It is an ideal HLW curing medium due to its high quality and long-term safety. At present, the preparation of perovskite zircon is mainly divided into liquid-phase method and solid-phase method. The li...

Claims

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Application Information

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IPC IPC(8): C04B30/00
Inventor 张魁宝文冠军李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH
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