Method for rapidly curing nuclides at low temperature with assistance of electric field

A rapid curing and electric field assisted technology, applied in nuclear engineering, radioactive purification, etc., can solve the problems of high calcination temperature and long time, and achieve the effect of increasing defect concentration and curing rate

Inactive Publication Date: 2019-09-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method realizes the rapid synthesis of artificial rocks by applying a certain electric field and current density in the temperature range above 600 ° C, effectively solving the problems of high calcination temperature and long time in the traditional artificial synthesis method

Method used

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  • Method for rapidly curing nuclides at low temperature with assistance of electric field
  • Method for rapidly curing nuclides at low temperature with assistance of electric field
  • Method for rapidly curing nuclides at low temperature with assistance of electric field

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for quickly solidifying nuclide at low temperature under the assistance of an electric field, the specific steps are as follows:

[0029] a) Sample preparation:

[0030] Gadolinium oxide, neodymium oxide and zirconium oxide powders (molar ratio 1:4:5) are uniformly mixed by ball milling, and then molded.

[0031] b) Solid phase synthesis:

[0032] Put the prepared sample into the sintering furnace, and apply a voltage of 1000V (electric field strength E=1500V / cm) to the sample at 600°C through an external DC power supply to make the current reach 0.6A (current density j=100mA / mm 2 ), and kept for 5s, gadolinium oxide, neodymium oxide and zirconium oxide were solid-dissolved into one phase under the action of an electric field, and a pyrochlore structure (Gd 0.2 Nd 0.8 ) 2 Zr 2 o 7 , to achieve rapid solidification of nuclides at low temperatures, and to form stable pyrochlore-structured ceramics.

Embodiment 2

[0034] a) Sample preparation:

[0035] Gadolinium oxide, neodymium oxide and zirconium oxide powder (mole ratio is 4:1:5) are uniformly mixed by ball milling, and then molded.

[0036] b) Solid phase reaction:

[0037] Put the prepared sample into a sintering furnace, and apply a voltage of 400V (electric field strength E=500V / cm) to the sample at 800°C through an external DC power supply to make the current reach 0.30A (current density j=50mA / mm 2 ), and kept for 10s, gadolinium oxide, neodymium oxide and zirconium oxide were solid-dissolved into one phase under the action of an electric field, and a pyrochlore structure (Gd 0.8 Nd 0.2 ) 2 Zr 2 o 7 .

Embodiment 3

[0039] a) Sample preparation:

[0040] Gadolinium oxide, neodymium oxide and zirconium oxide powders (molar ratio 3:2:5) are uniformly mixed by ball milling, and then molded.

[0041] b) Solid phase reaction:

[0042] Put the prepared sample into a sintering furnace, and apply an 80V voltage (electric field strength E=100V / cm) to the sample at 1000°C through an external AC power supply (frequency 100Hz), so that the current reaches 1.20A (current density j=200mA / cm mm 2 ), and kept for 1s, gadolinium oxide, neodymium oxide and zirconium oxide were solid-dissolved into one phase under the action of an electric field, and a pyrochlore structure (Gd 0.6 Nd 0.4 ) 2 Zr 2 o 7 .

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Abstract

The invention relates to a method for rapidly curing nuclides at low temperature with the assistance of an electric field, in particular to a method for rapidly curing nuclides at the low temperaturerange of 600 DEG C or above with the assistance of the electric field, and belongs to the field of nuclear waste post-treatment. The method comprises the steps that firstly, nuclide-containing oxidesare uniformly mixed through ball milling and freeze-dried to obtain mixed powder, and then die-pressing forming is conducted; a critical electric field is applied to a sample at the temperature rangeof 600 DEG C or above, and a compound is subjected to a solid phase reaction rapidly under the function of the electric field to generate a target compound. The method has the advantages of low synthesis temperature and short time, the energy consumption is effectively reduced, the reaction time is saved, and a very convenient means is provided for low-temperature rapid synthesis of artificial rock and rapid curing of the nuclides.

Description

technical field [0001] The invention relates to a method for quickly solidifying nuclides at low temperature under the assistance of an electric field, in particular to a method for quickly solidifying nuclides at a temperature range above 600°C by using an electric field assistance method, and belongs to the field of nuclear waste reprocessing. Background technique [0002] With the continuous development of nuclear-related research, nuclear technology has become increasingly mature and widely used in military affairs and people's production. What follows is the problem of nuclear waste disposal. Nuclear waste that can no longer be used for production still has A certain amount of radioactivity, if handled unreasonably, will seriously affect the ecological environment and human health. At present, there are two ways of thinking about nuclear waste treatment. The first is to use separation-transmutation, that is, the P-T method. The second is to solidify high-level radioact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/64G21F9/30
CPCC04B35/48C04B35/62204C04B35/64C04B2235/3224C04B2235/656C04B2235/6567C04B2235/666C04B2235/762G21F9/302
Inventor 王一光任科
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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