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A cement solidified body of nuclear power plant radioactive distillation residue and its preparation method

A cement curing and radioactive technology, applied in radioactive purification, nuclear engineering and other directions, can solve the problems of slow setting time, large capacity expansion rate, and rapid loss of fluidity over time, so as to reduce hydration heat release and accelerate fluidity loss. , The effect of improving the capillary structure

Active Publication Date: 2021-11-05
SHANGHAI RESEARCH INSTITUTE OF BUILDING SCIENCES CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the special requirements of some nuclear power plants for the solidified body of radioactive distillation residue cement in nuclear power plants, the present invention overcomes the problems of high solidification rate of distillation residue cement, bleeding stratification, rapid loss of fluidity over time, and too slow setting time. The main purpose of this paper is to provide a formula for the solidified body of radioactive distillation residue cement in nuclear power plants, so that the solidified body of steam residue cement can meet the national standard GB14569. There is no bleeding and layering phenomenon in the body, the initial fluidity reaches 220mm-250mm, and the fluidity is maintained well, and the final setting time is within 24h and other special requirements

Method used

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  • A cement solidified body of nuclear power plant radioactive distillation residue and its preparation method

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preparation example Construction

[0025] The preparation process of embodiment 1~5 is as follows:

[0026] A. Prepare curing special additives according to mass percentage;

[0027] B. The solidification special additive and cement obtained in A are loaded into the hopper successively, the special solidification additive for controlling is located at the lower floor, and the cement is located at the upper floor;

[0028] C. Prepare the simulated steamed residue and pour it into the solidified steel drum, insert the stirring paddle, and stir at a constant speed of 300r / min;

[0029] D. Open the hopper of step B, and slowly and uniformly add the mixed material into the solidified steel drum at a speed of 80r / min within 20min;

[0030] E. Increase the stirring speed of the stirring paddle to 120r / min, continue to accelerate the stirring for 25 minutes, and then pull out the stirring paddle;

[0031] F. Cover the steel drum and maintain it at room temperature to obtain the cement solidified body of the radioacti...

Embodiment 1

[0033] Mix mineral powder, diatomaceous earth, zeolite powder, starch ether, and powdered polycarboxylate superplasticizer according to the mass percentage of 60%: 17.6%: 20%: 0.4%: 2% to form a special curing additive. Water, Boric acid, mannitol, and sodium hydroxide are prepared by mass percentage 93%: 5%: 1%: 1% to prepare the simulated steamed raffinate, and the simulated steamed raffinate, cement and special curing additives are used in a mass ratio of 4:7:3 according to the above steps Stir to prepare the steam raffinate cement solidified body.

Embodiment 2

[0035] Mix mineral powder, diatomaceous earth, zeolite powder, starch ether, and powdered polycarboxylate superplasticizer according to the mass percentage of 50%: 31.7%: 15%: 0.3%: 3% to form a special curing additive, water, Boric acid, mannitol, and sodium hydroxide are prepared according to the mass percentage of 95.1%: 3.5%: 0.8%: 0.6% to prepare the simulated steamed raffinate, and the simulated steamed raffinate, cement and special curing additives are used according to the mass ratio of 1.68:3:1 according to the above steps Stir to prepare the steam raffinate cement solidified body.

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Abstract

The invention discloses a nuclear power plant radioactive distillation raffinate cement solidified body and a preparation method thereof. It is obtained by first adding curing special additives and then adding cement and stirring. The radioactive distillation raffinate is composed of 93% to 98% water, 2% to 5% boric acid, 0.5% to 1% mannitol and 0.2% to 1% sodium hydroxide. It is specially used for curing The additive is composed of 40%-60% mineral powder, 17%-45% diatomite, 10%-20% zeolite powder, 0.2%-0.4% starch ether and 2%-4% powder polycarboxylate water reducer. The invention can reduce the compatibilization rate of the cement solidified body to 75%, while still having high fluidity and high water retention, and meets the provisions of the national standard GB14569.1-2011, greatly reduces the retarding effect of boric acid on cement, and realizes coagulation Time controllable effect.

Description

technical field [0001] The invention relates to the field of cement solidification of nuclear power radioactive distillation residue, in particular to a cement solidification body of nuclear power plant radioactive distillation residue and a preparation method thereof. Background technique [0002] The safe disposal of low- and intermediate-level waste during the operation of nuclear power plants is of great significance to the sustainable development of nuclear energy and nuclear technology utilization in my country, environmental safety and public safety. which contains 137 Cs, 90 Sr, 60 Low-to-medium-level radioactive wastewater of Co and other radionuclides, including process wastewater, ground drainage, and chemical wastewater, needs to be treated by heat pump evaporation and drying and volume reduction processes. After evaporation to form a distilled raffinate, cement, asphalt, glass, plastic, etc. Carry out final curing treatment to convert harmful substances into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00G21F9/16
CPCC04B28/00C04B2111/00017G21F9/165C04B18/141C04B14/08C04B14/047C04B24/383C04B2103/302C04B22/002C04B22/0013C04B24/10C04B22/062
Inventor 樊俊江孙丹丹於林锋韩建军王琼沈贵阳
Owner SHANGHAI RESEARCH INSTITUTE OF BUILDING SCIENCES CO LTD
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