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Cement solidification method of nuclear power wastes

A technology for the solidification of nuclear power waste and cement, applied in the field of nuclear power, can solve the problems that the performance of the solidified body cannot meet the standard requirements, the secondary pollution of waste, and the overflow of waste, so as to meet the performance of the solidified cement body, minimize the waste, Effective effect of waste disposal

Active Publication Date: 2012-11-28
中广核工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is an operation error during the manual adjustment process, the waste will overflow from the waste bucket, resulting in secondary pollution of the waste, and even cause the performance of the solidified body to fail to meet the standard requirements.

Method used

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  • Cement solidification method of nuclear power wastes
  • Cement solidification method of nuclear power wastes
  • Cement solidification method of nuclear power wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1. The method of the present invention is used in a nuclear power plant to conduct a solidification treatment test on the radioactive concentrate, and the details are as follows:

[0038] 1. Concentrate cement curing formula for radioactive curing

[0039] 1.1 Composition and order of addition of concentrated liquid cement curing formula

[0040] order of addition Composition 1 Concentrate 2 Admixture 3 lime 4 cement

[0041] 1.2 Curing material and model

[0042]

[0043]

[0044] 1.3 Corresponding data of each raw material

[0045] waste source item unit range and value Borate ion concentration ppm / l chemical analysis measurement total salt g / Kg chemical analysis measurement Phosphate ion concentration mol / Kg chemical analysis measurement Sulfate ion concentration mol / Kg chemical analysis measurement Lime and borate ion excess multiple - 2 ...

Embodiment 2

[0087] Embodiment 2, a cement solidification method for nuclear power waste, the specific steps are the same as those in Embodiment 1, after obtaining the slurry, use A standard small test mold yields multiple cured body samples.

[0088] 1. The parameters of raw materials and waste to be treated are shown in Table 10:

[0089] Table 10 To-be-treated concentrate, raw material parameter table

[0090] Waste to be processed, raw materials unit parameter Borate ion concentration ppm / l 40000 total salt g / Kg 229.8 Phosphate ion concentration mol / Kg 0.1 Sulfate ion concentration mol / Kg 0.1 Lime and borate ion excess multiple - 1.8 Lime and phosphate ion excess multiple - 1.2 Lime and sulfate ion excess multiple - 0.8 Concentrate density g / cm 3 1.1 Water-cement ratio (water:lime) - 0.35 External ash ratio (admixture: lime) - 2.0%

[0091] Concentrate cement cu...

Embodiment 3

[0119] Embodiment 3, a cement solidification method for nuclear power waste, the specific steps are the same as those in Embodiment 1, after obtaining the slurry, adopt A standard small test mold yields multiple cured body samples.

[0120] 1. The parameters of raw materials and waste to be treated are shown in Table 17:

[0121] Table 17 Parameters of raw materials and waste to be treated

[0122]

[0123] According to the above table, the cement curing formula of concentrated liquid is obtained:

[0124] cement Concentrate slaked lime Admixture Total 417.22 227.52 63.5 4.2 692.47

[0125] The volume inclusion rate of the concentrated solution in this example is 56%, which is 16% higher than the existing one.

[0126] 5.2 Compressive strength The test results of the compressive strength of the samples are shown in Table 18.

[0127] Table 18 Compressive strength test results of small sample samples of concentrated liquid cement ...

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Abstract

The invention discloses a cement solidification method of nuclear power wastes. The cement solidification method comprises the steps of taking cement, lime and an additive as raw materials of a curing agent; detecting the density of concentrated solution, the concentration of boric acid radical ions, total salt content, the concentration of phosphate radical ions, and the concentration of sulfate radical ions in nuclear power waste concentrated solution; determining the weight of the needed cement, additive and lime; sequentially adding the additive, the lime and the cement in the nuclear power waste concentrated solution, and stirring; and standing and curing slurry to obtain the cement solidification body. According to the cement solidification method of the nuclear power wastes provided by the invention, the volume of the cement solidification body is reduced, the containing rate of the nuclear power waste is increased, and the processing process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and relates to a treatment method for nuclear power plant radioactive waste, in particular to a cement solidification method for nuclear power waste. Background technique [0002] Because cement is an inorganic material, the cement curing process is simple, and the solidified body has specific long-term stability characteristics, so cement curing is widely used in the solidification of radioactive waste in nuclear power plants. After the radioactive waste is solidified by cement, the volume of the cement solidified body is much larger than that of the original waste, which increases the final disposal cost of the waste. [0003] At present, the cement solidification formula used in nuclear power plants to treat radioactive waste is suitable for specific waste source items. Human intervention is required when the actual solidification operation deviates from the waste source items. The curi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/16G21F9/30
CPCC04B28/04C04B2111/00767Y02W30/91C04B18/0463C04B22/064
Inventor 张鹏王辉诚景顺平袁建春裴新意于兴毫钟香斌
Owner 中广核工程有限公司
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