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A cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash

A solidified material and low-radioactivity technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as high nuclide leaching rate, damaged packaging containers, and low waste packaging capacity, and achieve nuclide Low ion erosion rate, stable mechanical properties and broad application prospects

Active Publication Date: 2009-10-07
浙江合力海科新材料股份有限公司
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AI Technical Summary

Problems solved by technology

[0007] (1) The waste bag capacity is low (about 20%);
[0008] (2) The nuclide leaching rate is relatively high, especially the solidification effect on plutonium-containing waste is relatively poor;
[0010] (4) Most of the domestic research stays in the simulated solidification stage, and seldom conducts real waste solidification treatment;
[0012] In addition, there are few studies on the solidification of low- and medium-radiation incineration ash, and the composition and properties of incineration ash seriously affect the improvement of the inclusion capacity of the solidified body and the solidification effect of nuclide ions.
For example, a. When CaO is mixed with ash, it reacts with water to form Ca(OH) 2 , a large amount of heat is released, the volume expands by 97.9%, and local stress is generated, resulting in poor stability of the solidified body; b. When the ash is mixed with PbO, ZnO, CuO, etc., these metal oxides will delay the hydration reaction of cement; c .When the ash is mixed with metals such as Mg, Al, Zn, Sn and Pb, the alkaline components in the cement will react with these metals, causing hydrogen gas to be released when the cured product is placed, causing cracks in the cured body, and even causing The packaging container is damaged

Method used

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  • A cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash
  • A cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash
  • A cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, preparation and solidification effect of cement-based solidified material for processing medium and low radioactive incineration ash

[0049] Such as figure 1 As shown, a solid activator is used to prepare a cement-based curing material and perform curing treatment.

[0050] Grinding: Grinding raw materials, including slag, zeolite, low-temperature calcined metakaolin and Huaxin P I 52.5 cement clinker (Portland cement), respectively grinding to 400±20m 2 / Kg, 100 mesh, 1000 mesh, 400±20m 2 / Kg.

[0051] Ingredients and Mixing:

[0052] Get 4.97Kg slag, 1.5Kg zeolite, 1.5Kg metakaolin and 0.7Kg cement clinker after grinding, then get 0.5Kg polymer latex powder and 0.8Kg self-made composite solid activator (by the silicic acid of 15 parts by weight) Sodium, 75 parts of sodium sulfate and 10 parts of calcium hydroxide), put it into the mixer, and add 0.03kg of high-efficiency water reducer (Nai series high-efficiency water reducer FDN) and mix evenly. T...

Embodiment 2

[0065] Embodiment 2, preparation and detection of cement-based solidified material for processing medium and low radioactive incineration ash

[0066] according to figure 2 As indicated, a liquid activator cement-based curing material was prepared.

[0067] Grinding: Grind slag, fly ash, zeolite, and Huaxin P I 52.5 cement clinker to 500±20m 2 / Kg, 450±20m 2 / Kg, 200 mesh, 450±20m 2 / Kg;

[0068] Mixture:

[0069] Take 6.0Kg of slag, 1.5Kg of fly ash, 1.5Kg of zeolite and 1.0Kg of Huaxin P I 52.5 cement clinker and mix evenly to obtain material A1 to be activated;

[0070] Take 6.5Kg of slag, 1.0Kg of fly ash, 2.0Kg of zeolite and 0.5Kg of Huaxin P I 52.5 cement clinker and mix evenly to obtain the material to be excited A2;

[0071] Take 5.5Kg of slag, 1.0Kg of fly ash, 3.0Kg of zeolite and 0.5Kg of Huaxin P I 52.5 cement clinker and mix them evenly to obtain the material to be activated A3;

[0072] According to high metal oxide incineration ash (from China Academy o...

Embodiment 3

[0076] Embodiment 3, preparation and detection of cement-based solidified material for processing medium and low radioactive incineration ash

[0077] Grinding: Grind slag, zeolite, metakaolin, and reference cement clinker (purchased from Beijing Xingfa Cement Co., Ltd.) to 400±20m 2 / Kg, 300 mesh, 1500 mesh and 500±20m 2 / Kg;

[0078] Mixture:

[0079] Take 6.55Kg of slag, 1.5Kg of zeolite, 1.5Kg of metakaolin, 0.4Kg of reference cement clinker and 0.05kg of Nai series high-efficiency water reducer FDN and mix evenly to obtain material C1;

[0080] Take 6.65g of slag, 1.2g of zeolite, 1.2Kg of metakaolin, 0.5Kg of polymer latex powder, 0.4Kg of reference cement clinker and 0.05kg of Nai series high-efficiency water reducer FDN and mix them uniformly to obtain material C2;

[0081] Get 6.02Kg slag, 1.5Kg zeolite, 1.5Kg metakaolin, 0.4Kg high-performance cement clinker and 0.5Kg composite solid activator (by weight 35 parts of sodium silicate, 55 parts of sodium sulfate and ...

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Abstract

The invention discloses a cement-based solidified material for processing middle and low radioactive incineration ash and a method for processing middle and low radioactive incineration ash. The solidified material, using the slag, fly ash, zeolite, metakaolin, cement clinker as the material to be excited, is obtained through the even mixture with activator after grinding. The liquid activator or combined solid activator can be used as the activator. Mix the material to be excited and activator together, according to the package content of 30-40%, mix with the incineration ash, stir, and maintain to solidification in light of the solidification operation. The cement-based solidified material of the invention can prepare the nuclear waste solidified body with the incineration ash package content greater than 30%, stable mechanical performance, and low leaching rate of radionuclide ion. Especially when solidifying the plutonium-containing waste, the 42-day Pu leaching rate is 10 cm / d. The invention will play an important role in the middle and low radioactive incineration ash processing with good application prospect.

Description

technical field [0001] The invention relates to a solidified material for treating radioactive waste, in particular to a cement-based solidified material for treating medium and low radioactive burning ash and its application in treating medium and low radioactive burning ash. Background technique [0002] Due to the application and research of nuclear science and nuclear technology in science, medicine, industry and military affairs, a large amount of radioactively polluted plastic, paper, work clothes, gloves and other wastes with medium and low radioactivity and flammability are produced every year. In order to eliminate the hidden danger of leakage of radioactive substances caused by mildew and fire, etc., it is necessary to incinerate and reduce the volume to generate a stable form that is easy to dispose of - incineration ash. [0003] However, incineration cannot change the radioactivity of the waste. How to properly and strictly manage the radioactive incineration as...

Claims

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Application Information

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IPC IPC(8): C04B7/26A62D3/33
CPCC04B2111/00767C04B28/00C04B28/26Y02W30/91C04B7/02C04B12/04C04B14/047C04B14/106C04B18/08C04B18/141C04B22/064C04B22/147C04B2103/0057C04B2103/302C04B24/226C04B24/26
Inventor 李长成崔琪吴春丽张文生张洪滔
Owner 浙江合力海科新材料股份有限公司
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