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Cement solidification method of nuclear power waste

A nuclear power waste and cement solidification technology, applied in the field of nuclear power, can solve problems such as waste overflow, solidified body performance not meeting standard requirements, waste secondary pollution, etc., to achieve waste minimization, cement solidified body performance to meet, Effective waste disposal

Active Publication Date: 2016-04-06
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 waste
  • Cement solidification method of nuclear power waste
  • Cement solidification method of nuclear power waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, adopted the method of the present invention to carry out solidification treatment test to radioactive concentrate in certain nuclear power plant, be specifically described as follows:

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

[0039] 1.1 Composition and addition sequence 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...

Embodiment 2

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

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

[0089] Table 10 Concentrate to be treated, raw material parameter list

[0090] Waste to be processed, raw materials

unit

parameters

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....

Embodiment 3

[0119] Embodiment 3, a cement curing method for nuclear power waste, the specific steps are the same as in Embodiment 1, after obtaining the slurry, use The standard small test mold obtains 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 table above, the concentrated liquid cement curing formula is obtained:

[0124] cement

Concentrate

slaked lime

Admixture

Total

417.22

227.52

63.5

4.2

692.47

[0125] The volume containment rate of the concentrated solution of this example is 56%, which has increased by 16% on the existing basis.

[0126] 5.2 Compressive strength See Table 18 for the compressive strength test results of the samples.

[0127] Table 18 Concentrated liquid cement solidified body small test mold sample compressive strength tes...

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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 Patents(China)
IPC IPC(8): G21F9/16G21F9/30
CPCC04B28/04C04B2111/00767Y02W30/91
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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