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Zirconolite type ceramic solidified body and preparation method and application thereof

A technology of ceramic solidification and perovskite zirconium, which is applied in the field of ceramic materials, can solve the problems of high energy consumption, complicated process, and long time consumption, and achieve the effects of low energy consumption, simple process, and less time-consuming

Inactive Publication Date: 2020-05-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the complex, time-consuming and high energy consumption characteristics of the traditional preparation of perovskite zircon, the present invention develops a new method for sintering perovskite zircon-type artificial rock solidification body by one-step microwave heating

Method used

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  • Zirconolite type ceramic solidified body and preparation method and application thereof
  • Zirconolite type ceramic solidified body and preparation method and application thereof
  • Zirconolite type ceramic solidified body and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The raw materials of calcium titanate, nano-titanium dioxide (with a particle size of 60nm), and zirconia are taken in a mass ratio of 38:34:22. The above mixed powder is added to absolute ethanol and zirconia balls, mixed on a roller ball mill for 20 hours, and the mixed powder obtained after drying is formed by dry pressing at 30 MPa to obtain a pottery embryo, and then put the pottery embryo into a microwave sintering furnace , heated up to 1400°C at 40°C / min, held for 10 minutes, cooled down to 800°C at 40°C / min, and then cooled with the furnace to obtain a perovskite-zircon ceramic solidified body (CaZrTi 2 o 7 )

[0032] figure 1 The perovskite zircon type ceramic solidified body (CaZrTi 2 o 7 ) XRD pattern. From figure 1 It can be seen that the reaction is complete, no impurity phase is formed, and the obtained sample is CaZrTi 2 o 7 pure phase. figure 2 The SEM photo of the perovskite-zircon type ceramic solidified body section that the present embodim...

Embodiment 2

[0034] The difference from Example 1 is that the mass ratio of calcium titanate, nano-titanium dioxide (60nm in particle size) and zirconia is 40:36:24, and the conditions of the sintering process: the temperature is raised to 1400°C at 30°C / min, Insulate for 10 minutes, cool down to 800°C at 30°C / min and then cool with the furnace, the main phase of the prepared sample is CaZrTi 2 o 7 , to prepare perovskite zircon type ceramic solidified body (CaZrTi 2 o 7 ), electron microscope results showed that the samples were sintered uniformly.

Embodiment 3

[0036] The difference from Example 1 is: with calcium hydroxide powder, nano titanium dioxide powder (particle size is 60nm), zirconia powder as raw material, get each raw material by the ratio of calcium hydroxide 40g, nano titanium dioxide 36g, zirconia 24g . The sintering process is: heat up to 1300°C at 30°C / min, hold for 1 hour, cool down to 800°C at 30°C / min, and then cool with the furnace to obtain a perovskite-zircon ceramic solidified body (CaZrTi 2 o 7 ), electron microscope results show that the sample has fewer pores and more uniform sintering.

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Abstract

The invention belongs to the field of solidification treatment for high-radioactivity solid-state nuclear waste, and discloses a zirconolite type ceramic solidified body (CaZrTi2O7) and a preparationmethod and application thereof. The preparation method comprises the following steps: mixing a calcium compound, nanometer titanium dioxide and zirconium oxide, adding a solvent and zirconium oxide grinding balls, carrying out ball-milling and mixing, then successively performing drying and screening to obtain mixed powder; and carrying out dry pressing on the mixed powder to form a ceramic blank,and heating the ceramic blank to 1100-1400 DEG C, carrying out microwave sintering, conducting cooling to 800-1000 DEG C, and carrying out cooling in a furnace. The zirconolite solidified body is more uniform, a reaction temperature is lower, preparation process is simple, a synthesis speed is high, energy consumption is low, and a good foundation is laid for engineering of zirconolite type man-made rock solidified high-level solid waste.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a perovskite-zircon type ceramic solidified body and a preparation method and application thereof. Background technique [0002] With the continuous development of the nuclear industry, the treatment of high-level radioactive waste has gradually become the focus and difficulty of nuclear waste treatment at home and abroad. Most of the existing nuclear waste treatment technologies are based on vitrification. However, vitrified substrates are mostly aimed at the solidification of low-level radioactive waste, and because the solubility of some key nuclides in vitrified solidified bodies is very low, a new type of solidified substrate-ceramic solidified body is needed to better Properly dispose of high-level solid nuclear waste. [0003] Perovskite zircon is a complex compound that is difficult to synthesize. At present, its preparation methods are mostly liquid phase m...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622G21F9/30
CPCC04B35/49C04B35/622G21F9/302C04B2235/3236C04B2235/3208C04B2235/5454C04B2235/667C04B2235/6562C04B2235/6565C04B2235/6567
Inventor 郭伟明卫紫君孙世宽吴利翔牛文彬林华泰
Owner GUANGDONG UNIV OF TECH
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