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Neodymium-doped zircon-based ceramic solidified body and preparation method thereof

A ceramic solidification, neodymium zircon-based technology, applied in the field of neodymium-doped zircon-based ceramic solidified body and its preparation, can solve problems such as low solid solution content, and achieve the effects of reducing production cost, shortening sintering time, and reducing temperature

Active Publication Date: 2022-07-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, borosilicate glass has some disadvantages, especially the volatility of some high-concentration tungsten elements at the melting temperature of the glass, and the low solid solution of some important radionuclides such as Tc and actinides in the glass

Method used

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  • Neodymium-doped zircon-based ceramic solidified body and preparation method thereof
  • Neodymium-doped zircon-based ceramic solidified body and preparation method thereof
  • Neodymium-doped zircon-based ceramic solidified body and preparation method thereof

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preparation example Construction

[0033] The present invention also provides the preparation method of the neodymium-doped zircon-based ceramic solidified body according to the above technical solution, comprising the following steps:

[0034] ZrO 2 Powder, SiO 2 Powder and Nd 2 O 3 The powder is mixed to obtain a mixed powder;

[0035] Wet-milling the mixed powder and eutectic salt to obtain a precursor;

[0036] drying and sintering the precursor in sequence to obtain a sintered product;

[0037] The sintered product is washed with water to obtain the neodymium-doped zircon-based ceramic solidified body.

[0038] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the field.

[0039] The present invention uses ZrO 2 Powder, SiO 2 Powder and Nd 2 O 3 The powders are mixed to obtain a mixed powder.

[0040] The present invention is suitable for ZrO 2 Powder, SiO 2 Powder and Nd 2 O 3 The source of the powder is not particularly ...

Embodiment 1

[0070] Take the dried ZrO 2 Powder, SiO 2 Powder and Nd 2 O 3 Powder, the particle size is less than 5μm, according to the stoichiometric ratio of ZrO 2 :SiO 2 :Nd 2 O 3 =0.98:1:0.01 ratio mixing to obtain mixed powder; mix the mixed powder with eutectic salt (the molar ratio of NaCl and KCl is 1:1) by mass ratio of 1:10 to obtain raw materials, and then add ethanol. The raw material was ground for 0.5h to obtain a uniformly mixed precursor; the precursor was dried in a drying oven at 85°C, and the drying time was 14h; the dried precursor was placed in a muffle furnace and heated to a sintering temperature of 1200°C. The rate is 5°C / min, the temperature is maintained for 6 hours, and the sintered product is obtained after cooling to room temperature; the sintered product is dispersed in pure water, washed, filtered or filtered, and dried to obtain a solidified powder of neodymium-doped zircon-based ceramics.

[0071] After testing, the grain size of the neodymium-doped ...

Embodiment 2

[0073] The only difference between this embodiment and the above-mentioned Embodiment 1 is the sintering temperature, and the sintering temperature of this embodiment is 1300°C.

[0074] After testing, the grain size of the neodymium-doped zircon-based ceramic solidified powder of this embodiment is 0.51±0.07 μm, and the synthesis rate of this method is 95.98%.

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Abstract

The invention belongs to the field of ceramic solidified bodies, and particularly relates to a neodymium-doped zircon-based ceramic solidified body and a preparation method thereof. The invention provides a neodymium-doped zircon-based ceramic solidified body, the chemical composition of the neodymium-doped zircon-based ceramic solidified body is Zr < 1-x > Nd < x > SiO < 4-x / 2 >, x is equal to 0.02-0.1, crystal grains are fine and uniform, the particle size is 0.3-0.9 mu m, and the neodymium-doped zircon-based ceramic solidified body powder does not contain other elements except zircon and neodymium elements. The preparation method of the neodymium-doped zircon-based ceramic solidified body comprises the following steps: mixing ZrO2 powder, SiO2 powder and Nd2O3 powder to obtain mixed powder; carrying out wet grinding on the mixed powder and eutectic salt to obtain a precursor; sequentially drying and sintering the precursor to obtain a sintered product; and washing the sintered product with water to obtain the neodymium-doped zircon-based ceramic solidified body. According to the method, the neodymium-doped zircon-based ceramic solidified body powder with fine and uniform crystal grains and high synthesis rate can be obtained at a relatively low temperature within a short time, and the process is simple to operate.

Description

technical field [0001] The invention belongs to the field of ceramic solidified bodies, and in particular relates to a neodymium-doped zircon-based ceramic solidified body and a preparation method thereof. Background technique [0002] The basic strategy for sequestering highly toxic and long-lived actinides in high-level radioactive waste from the biosphere is to fix them in durable crystalline phases. Current solidified matrices include glass, ceramics, and artificial rocks, which are currently used to immobilize high-level radioactive waste, reducing the possibility of radionuclide migration or diffusion. However, borosilicate glasses have some disadvantages, especially the volatility of some high concentrations of tungsten at the melting temperature of the glass, and the low solid solubility of some important radionuclides such as Tc and actinides in the glass. With the worldwide emphasis on geological disposal, artificial mineral ceramics can achieve higher loads for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/481C04B35/62645C04B2235/3224C04B2235/444C04B2235/5436
Inventor 段涛张胜泰刘建许保亮丁艺王凌坤黄苹郑操慧段思逸菡
Owner SOUTHWEAT UNIV OF SCI & TECH