Preparation method of kularite ceramic solidifying body

A technology of ceramic solidification and monazite, which is applied in the ceramic solidification treatment of minor actinide high-level radioactive waste and the preparation of cerium monazite ceramic solidified body, achieving the effect of simple and practical process, simple and practical process, and shortened sintering time

Inactive Publication Date: 2013-11-27
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cerium monazite solidification simulates minor actinides [gadolinium (Gd), praseodymium (Pr), europium (Eu)] and vacuum hot pressing sin

Method used

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  • Preparation method of kularite ceramic solidifying body
  • Preparation method of kularite ceramic solidifying body
  • Preparation method of kularite ceramic solidifying body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation method of cerium monazite ceramic solidified body, is based on Ce 2 (C 2 o 4 ) 3 10H 2 O, NH 4 h 2 PO 4 、Gd 2 (C 2 o 4 ) 3 10H 2 O is the raw material, and the formula is: Ce 2 (C 2 o 4 ) 3 10H 2 O 68.06wt.% (weight percent), NH 4 h 2 PO 4 24.02wt.%, Gd 2 (C 2 o 4 ) 3 10H 2 O 7.92wt.%; Weigh various raw materials, select materials: ball: absolute ethanol or / and water at 1:3.0:1.5 (mass ratio), use planetary mill for 4 hours, dry, add 6% polyethylene Alcohol (PVA) sol (the concentration of PVA is 12%), mixing, sieving, granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 10MPa, and then use a pressure of 200MPa to cold isostatically press it; the molded green body is heat-treated at 700°C for 300 minutes; the heat-treated green body is Sintering in a vacuum hot-pressing sintering furnace at 1100° C. and 30 MPa for 120 minutes to obtain a solid-dissolved gadolinium cerium...

Embodiment 2

[0033] A kind of preparation method of cerium monazite ceramic solidified body, is based on Ce 2 (C 2 o 4 ) 3 10H 2 O, NH 4 h 2 PO 4 、Pr 2 (C 2 o 4 ) 3 10H 2 O is the raw material, and the formula is: Ce 2 (C 2 o 4 ) 3 10H 2 O 68.30wt.% (weight percent), NH 4 h 2 PO 4 24.10wt.%, Pr 2 (C 2 o 4 ) 3 10H 2 O 7.61wt.%; Weigh various raw materials, select materials: ball: absolute ethanol or / and water at 1:3.0:1.5 (mass ratio), use planetary mill for 4 hours, dry, add 6% polyethylene Alcohol (PVA) sol (the concentration of PVA is 12%), mixing, sieving, granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 10MPa, and then use a pressure of 200MPa to cold isostatically press it; the molded green body is heat-treated at 700°C for 300 minutes; the heat-treated green body is Sintering at 1100° C. and 30 MPa for 120 minutes in a vacuum hot-pressing sintering furnace to obtain a solid-dissolved praseodymium ceri...

Embodiment 3

[0035] A kind of preparation method of cerium monazite ceramic solidified body, is based on Ce 2 (C 2 o 4 ) 3 10H 2 O, NH 4 h 2 PO 4 、Eu 2 (C 2 o 4 ) 3 10H 2 O is the raw material, and the formula is: Ce 2 (C 2 o 4 ) 3 10H 2 O 68.14wt.% (weight percent), NH 4 h 2 PO 4 24.04wt.%, Eu 2 (C 2 o 4 ) 3 10H 2 O 7.82wt.%; Weigh various raw materials, select materials: ball: absolute ethanol or / and water at 1:3.0:1.5 (mass ratio), use planetary mill for 4 hours, dry, add 6% polyethylene Alcohol (PVA) sol (the concentration of PVA is 12%), mixing, sieving, granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 10MPa, and then use a pressure of 200MPa to cold isostatically press it; the molded green body is heat-treated at 700°C for 300 minutes; the heat-treated green body is Sintering in a vacuum hot-pressing sintering furnace at 1100° C. and 30 MPa for 120 minutes to obtain a solid-dissolved europium cerium m...

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Abstract

The invention discloses a preparation method of a kularite ceramic solidifying body. The preparation method is characterized in that Ce2(C2O4)3.10H2O, An2 (C2O4)3.10H2O/oxide of An (An=Gd, Pr and Eu) and NH4H2PO4 are taken as raw materials; the high-quality kularite ceramic solidifying body is prepared according to formulation designing and the steps such as fine grinding, drying, granulating, forming, adhesive removing and vacuum hot-pressing sintering at a lower temperature. The kularite ceramic solidifying body prepared according to the preparation method is high in heat stability, mechanical stability, chemical stability and anti-radiation stability, is applicable to the safe solidification treatment of high-level waste, particularly applicable to the safe solidification treatment of high-level minor actinides waste which is high in radioactivity and toxicity, and long in half life period, and also applicable to the engineering application of high-level waste ceramic solidification treatment needing remote operation.

Description

technical field [0001] The invention belongs to solidification treatment of radioactive waste, and relates to a preparation method of a solidified body of cerium monazite ceramics. The cerium monazite ceramic solidified body prepared by the method of the invention is particularly suitable for ceramic solidification treatment of minor actinide high-level radioactive wastes. Background technique [0002] With the development of human society, the demand for energy is increasing day by day. However, fossil energy sources such as coal and oil are becoming increasingly exhausted. Human beings have to find safe, effective and clean alternative energy sources in order to realize the sustainable development of human society. It is under this general trend that nuclear energy has been vigorously developed and promoted. However, while the development and utilization of nuclear energy has brought huge economic and social benefits to mankind, it has also produced a large amount of radio...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/447C04B35/645
Inventor 滕元成杨航李玉香任雪潭曾攀王晓换
Owner SOUTHWEAT UNIV OF SCI & TECH
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