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Method for preparing radioactive waste solidified body

A technology of radioactive waste and solidified body, applied in the direction of radioactive purification, nuclear engineering, etc., can solve the problem of complicated preparation process, and achieve the effects of strong radioactivity, high toxicity and long half-life

Inactive Publication Date: 2013-02-13
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, aiming at the complicated preparation process of artificial rock solidified body, in order to improve the performance of perovskite zircon and sphene combined mineral solidified body, provide a kind of raw material that is cheap and easy to get, process The preparation method of radioactive waste solidified body that is simple, good performance; The present invention adopts ZrSiO 4 (Natural zircon, also known as zircon, can be used, the main chemical composition is ZrSiO 4 ; Synthetic ZrSiO can also be used 4 ), CaCO 3 、TiO 2 Such as relatively cheap raw materials, through formula design, using simple and practical hot pressing sintering technology, at a lower temperature to prepare high-purity, high-density perovskite zircon and sphene composite mineral solidification body, which is perovskite zircon, The engineering application of titanite-based immobilization treatment of high-level actinide radioactive waste lays the foundation

Method used

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  • Method for preparing radioactive waste solidified body
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Examples

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Effect test

Embodiment 1

[0029] ZrSiO 4 , CaCO 3 、TiO 2 、Nd 2 o 3 、Al 2 o 3 As raw material, the formula is: ZrSiO 4 27.12wt.% (weight percent), CaCO 3 27.59 wt.%, TiO 2 35.46 wt.%, Nd 2 o 3 8.03wt.%, Al 2 o 3 1.80wt.%; Weigh various raw materials, select materials: balls: absolute ethanol as 1:2.0:1.3 (mass ratio), use planetary mill for 4 hours, dry, add 6% polyvinyl alcohol (PVA) sol (The concentration of PVA is 12%), mixing, sieving and granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 50MPa, and then use a pressure of 250MPa to cold isostatically press it; the molded green body is heat-treated at 1100°C for 30 minutes; the heat-treated green body is Sintering in a vacuum hot-pressing sintering furnace at 1130°C and 30MPa for 180 minutes to obtain a solid-dissolved neodymium perovskite zircon and sphene composite mineral solidified body.

Embodiment 2

[0031] ZrSiO 4 , CaCO 3 、TiO 2 、Nd 2 o 3 、Al 2 o 3 As raw material, the formula is: ZrSiO 4 26.73 wt.% (weight percent), CaCO 3 26.01 wt.%, TiO 2 34.31 wt.%, Nd 2 o 3 10.58 wt.%, Al 2 o 3 2.38 wt.%; Weigh various raw materials, select materials: balls: absolute ethanol as 1:1.8:1.4 (weight ratio), use planetary mill for 4 hours, dry, add 6% polyvinyl alcohol (PVA) sol (The concentration of PVA is 12%), mixing, sieving and granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 50MPa, and then use a pressure of 200MPa to cold isostatically press it; the molded green body is heat-treated at 1050°C for 60 minutes; the heat-treated green body is Sintering in a vacuum hot-pressing sintering furnace at 1160°C and 40MPa for 45 minutes to obtain a solid-dissolved neodymium perovskite zircon and sphene composite mineral solidified body.

Embodiment 3

[0033] ZrSiO 4 , CaCO 3 、TiO 2 、Nd 2 o 3 、Al 2 o 3 As a raw material, according to the formula design principle described in the manual, through formula calculation, the formula of the ingredient ratio is ZrSiO 4 27.85 wt.%, CaCO 3 27.18 wt.%, TiO 2 34.47 wt.%, Nd 2 o 3 8.06 wt.%, Al 2 o 3 2.44wt.%.; Weigh various raw materials, select material: ball: absolute ethanol as 1:1.5:1.2 (weight ratio), use planetary mill for 5h, dry, add 6% polyvinyl alcohol (PVA) Sol (the concentration of PVA is 12%), mixing, sieving and granulating. Put the granulated powder into a steel mold, press it on a hydraulic press with a pressure of 30MPa, and then use a pressure of 150MPa to cold isostatically press it; the molded green body is heat-treated at 1080°C for 45 minutes; the heat-treated green body is Sintering in a vacuum hot-pressing sintering furnace at 1190° C. and 30 MPa for 30 minutes to obtain a solid-dissolved neodymium perovskite zircon and sphene composite mineral s...

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Abstract

The invention discloses a method for preparing a radioactive waste solidified body. The method is characterized by comprising the following steps of: finely grinding a raw material which comprises 9.53 to 29.41 weight percent of ZrSiO4, 23.36 to 32.12 weight percent of CaCO3, 31.07 to 38.46 weight percent of TiO2, 0 to 15.66 weight percent of Nd2O3, 0 to 29.09 weight percent of CeO2 and 0 to 3.97 weight percent of Al2O3; drying the raw material; and adding polyvinyl alcohol sol, granulating, screening, molding, discharging the sol, performing vacuum hot-pressing sintering, and thus obtaining the radioactive waste solidified body. By adoption of the method, the raw material is low in cost, a high-purity and high-density perovskite acorite and titanite combined mineral solidified body is prepared at low temperature by using a simple and practical hot-pressing sintering technology, and foundation is laid for engineering application to artificial rock solidification treatment of high-level waste.

Description

technical field [0001] The invention belongs to a radioactive waste solidification treatment method, and relates to a preparation method of a radioactive waste solidification body. It is especially suitable for artificial rock solidification treatment of high-level radioactive waste. Background technique [0002] With the increasing demand for energy in human society and the depletion of coal and oil, human beings have to look for safe and effective energy. In this case, nuclear energy has been vigorously developed and promoted. At present, nuclear power, hydropower and thermal power Become the three pillars of world energy. Disastrous nuclear safety events such as the Chernobyl nuclear accident in the former Soviet Union, the Three Mile Island nuclear accident in the United States, and the Fukushima nuclear accident in Japan have caused people to panic about nuclear radiation, and have aroused great attention from all countries in the world to the safe use of nuclear energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/30G21F9/34C04B26/04
Inventor 滕元成任雪潭刘海昌易发成
Owner SOUTHWEAT UNIV OF SCI & TECH
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