CN110342866B - Nuclear power station radioactive raffinate cement solidified body and preparation method thereof - Google Patents
Nuclear power station radioactive raffinate cement solidified body and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 99
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 32
- 230000000996 additive effect Effects 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 27
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 14
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010457 zeolite Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920002472 Starch Polymers 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 11
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004327 boric acid Substances 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 11
- 239000011707 mineral Substances 0.000 claims abstract description 11
- 239000008107 starch Substances 0.000 claims abstract description 11
- 235000019698 starch Nutrition 0.000 claims abstract description 11
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims abstract description 9
- 229930195725 Mannitol Natural products 0.000 claims abstract description 9
- 239000000594 mannitol Substances 0.000 claims abstract description 9
- 235000010355 mannitol Nutrition 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 20
- 238000004821 distillation Methods 0.000 claims description 18
- 230000000740 bleeding effect Effects 0.000 claims description 15
- 238000007711 solidification Methods 0.000 claims description 14
- 230000008023 solidification Effects 0.000 claims description 14
- 238000013517 stratification Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 230000000979 retarding effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 230000008719 thickening Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002901 radioactive waste Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000005025 nuclear technology Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002354 radioactive wastewater Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/16—Processing by fixation in stable solid media
- G21F9/162—Processing by fixation in stable solid media in an inorganic matrix, e.g. clays, zeolites
- G21F9/165—Cement or cement-like matrix
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a nuclear power station radioactive raffinate cement solidified body and a preparation method thereof, wherein the nuclear power station radioactive raffinate cement solidified body comprises the following components in percentage by mass of 4-4.5: 7-8: 2-3 of radioactive raffinate, cement and special curing additive, wherein the special curing additive is firstly reinforced in the raffinate and then added with the cement to be stirred, the radioactive raffinate consists of 93-98% of water, 2-5% of boric acid, 0.5-1% of mannitol and 0.2-1% of sodium hydroxide, and the special curing additive consists of 40-60% of mineral powder, 17-45% of diatomite, 10-20% of zeolite powder, 0.2-0.4% of starch ether and 2-4% of powder polycarboxylic acid water reducing agent. The invention can reduce the capacity-increasing rate of the cement solidified body to 75%, simultaneously has high fluidity and high water-retaining property, meets the regulation of national standard GB14569.1-2011, greatly reduces the retarding effect of boric acid on cement, and realizes the controllable effect of setting time.
Description
Technical Field
The invention relates to the field of nuclear power radioactive raffinate cement solidification, in particular to a nuclear power radioactive raffinate cement solidified body and a preparation method thereof.
Background
The safe disposal of low and medium level radioactive wastes in the operation process of the nuclear power station has important significance for sustainable development of nuclear energy and nuclear technology utilization, environmental safety and public safety in China. Therein containing137Cs、90Sr、60The low and medium level radioactive waste water containing radioactive nuclides such as Co, etc. including process waste water, ground hydrophobic and chemical waste water, etc. is treated by heat pump evaporation and drying volume reduction process, after the evaporation forms residual distillation liquid, it is finally solidified by adopting cement, asphalt, glass, plastics, etc. to make the harmful substances be converted into inert substances with stable physical or chemical properties, and have enough mechanical strength, so that the requirements of regeneration utilization or disposal can be met.
The existing raffinate cement solidified body preparation technology mostly refers to the requirements of the existing national standard of low and medium radioactive waste solidified body performance requirement-cement solidified body (GB14569.1-2011), the standard provides requirements for free liquid, mechanical performance, water resistance, freeze-thaw resistance and gamma irradiation resistance of a hardened cement solidified body, but indexes of bleeding stratification, fluidity, setting time, capacity increase rate and the like of newly mixed cement solidified body slurry are not clearly specified, so that the problems of bleeding stratification, rapid loss of fluidity with time, slow setting time and the like of a plurality of newly mixed cement solidified body slurries exist. At present, a nuclear power station requires that a raffinate cement solidified body does not condense within a certain time under special working conditions (such as power failure, machine failure and the like) and has good constructability so as to ensure that a stirring paddle and a cement solidified body slurry can be effectively separated; and meanwhile, the final setting time of the cement solidified body is required to be controlled within 24h, so that the high-efficiency transportation of the cement solidified body steel barrel when needed is ensured.
Technically, the cement solidification body with the special requirements has the following difficulties in the preparation process: (1) in order to prevent the cement solidified body from bleeding and layering, a lower water-cement ratio is generally needed, so that the compatibilization rate after solidification is higher; (2) the cement solidification body with higher water-to-gel ratio is adopted, so that the compatibilization rate is reduced, but the bleeding rate is easy to separate, and a thickening component is required to be added for modification; (3) after the thickening component is added, the fluidity loss of the concrete is increased with time, and the performance of the solidified slurry mixture is not easy to control.
Disclosure of Invention
Aiming at the special requirements of partial nuclear power stations on the radioactive raffinate cement solidified body of the nuclear power station, the invention solves the problems of large capacity increasing rate, bleeding stratification, high loss of fluidity with time, over-slow setting time and the like of the existing raffinate cement solidification, and the invention mainly aims to provide the formula of the radioactive raffinate cement solidified body of the nuclear power station, so that the condensate cement solidified body of the raffinate cement meets the special requirements of national standard GB14569.1-2011 in all properties, and simultaneously, the slurry has no bleeding stratification phenomenon under the condition of greatly reducing the capacity increasing rate, the initial fluidity reaches 220-250 mm, the fluidity is kept good, and the final setting time is within 24 h.
The invention also aims to provide a method for preparing the cement solidified body with the raffinate through the formula of the cement solidified body, which realizes the preparation of the cement solidified body with the raffinate under special requirements through a cement solidification special additive comprising mineral powder, zeolite powder, diatomite, starch ether, powder polycarboxylic acid water reducing agent and the like and a stirring mode of adding the additive and then adding cement, has simple process and good solidification effect and can meet the diversified requirements of cement solidification processes in nuclear power engineering.
The above object of the present invention is achieved by the following technical solutions:
the technical scheme of the formula of the nuclear power station radioactive raffinate cement solidified body comprises the radioactive raffinate, cement and a special solidification additive, wherein the mass ratio of the radioactive raffinate to the cement to the special solidification additive is 4-4.5: 7-8: 2-3; wherein:
the radioactive raffinate consists of the following components in percentage by mass: 93-98% of water, 2-5% of boric acid, 0.5-1% of mannitol and 0.2-1% of sodium hydroxide.
Further, the special curing additive comprises the following components in percentage by mass: 40-60% of mineral powder, 17-45% of diatomite, 10-20% of zeolite powder, 0.2-0.4% of starch ether and 2-4% of powder polycarboxylic acid water reducing agent.
Furthermore, the cement solidified body has a compatibilization rate of 75-85%, an initial fluidity of 220-250 mm, a fluidity of more than 200mm in 1h, no bleeding stratification, an initial setting time of more than 6h, and a final setting time of no more than 24 h.
The technical scheme of the preparation method of the nuclear power station radioactive raffinate cement solidified body comprises the following steps:
step A: preparing a special curing additive according to mass percentage;
and B: b, sequentially loading the special curing additive and cement obtained in the step A into a hopper, wherein the special curing additive is positioned at the lower layer, and the cement is positioned at the upper layer;
and C: injecting the components of the radioactive residual distillation liquid into a solidified steel barrel, inserting a stirring paddle, and uniformly stirring at a speed of 300 r/min;
step D: b, opening the hopper in the step B, and slowly adding the mixed materials into a curing steel barrel at a constant speed of 80r/min within 20 min;
step E: increasing the stirring speed of the stirring paddle to 120r/min, and continuously accelerating the stirring for 25 min;
step F: and (5) sealing the steel drum, and maintaining at normal temperature to obtain the steel drum.
Compared with the prior art, the invention has the beneficial effects that:
1. in the prior art, the water-to-glue ratio of a cement solidified body without bleeding stratification is within the range of 0.3-0.35, and the capacity increasing rate of a solidified residual distillation liquid is over 90 percent.
2. The mineral powder in the special curing additive is beneficial to reducing the hydration heat release of cement in the cement cured body of the raffinate, reducing the fluidity loss of the cement cured body in the stirring process and improving the operable time; in addition, the volcanic ash activity of the mineral powder is beneficial to improving the capillary structure of the cement solidified body, improving the leaching resistance of the cement solidified body and reducing the risk of radionuclide leakage.
3. The zeolite powder, the diatomite and the starch ether are used simultaneously in the special curing additive, so that the water retention effect of the cement cured body of the distillation residue liquid can be improved, the bleeding layering phenomenon of the slurry of the cured body can be effectively improved, and the defect of a single thickening material is overcome: the zeolite powder is used independently, the water retention thickening effect is insufficient when the mixing amount is low, the hydration process of cement is accelerated when the mixing amount is high, and the slurry fluidity loss is accelerated; starch ether is used independently, the water retention thickening effect is insufficient when the mixing amount is low, and a large amount of bubbles are introduced in the stirring process when the mixing amount is high, so that the compactness of a cement solidified body is reduced, and the strength is reduced; the diatomite is used independently, so that the fluidity of the cement solidified body can be effectively adjusted, the leaching resistance of the cement solidified body is improved, but the water-retaining thickening effect of the diatomite is not as good as that of zeolite powder and starch ether, and the required thickening effect cannot be achieved even if the mixing amount is large. The composite use of the three thickening materials can reduce the absolute use amount of a single thickening material, and the cement solidified body slurry also has higher water retention and uniformity under the condition of higher water-to-glue ratio of 0.4-0.45.
4. The invention adds the special curing additive into the residual distillation liquid firstly, and then adds the cement in the preparation method, so that the admixture particles are fully dispersed in the residual distillation liquid in advance, thereby effectively avoiding the excessive contact between the cement particles and boric acid in the residual distillation liquid, controlling the setting time of the residual distillation liquid cement cured body in a target range, preventing the problem of overlong setting time, having simple preparation process, good curing effect and constructability, and meeting the requirements of efficient transportation and disposal.
Detailed Description
The following further describes the embodiments of the present invention in detail.
The preparation processes of the examples 1 to 5 are as follows:
A. preparing a special curing additive according to mass percentage;
B. sequentially feeding the special curing additive and the cement obtained in the step A into a hopper, and controlling the special curing additive to be positioned at the lower layer and the cement to be positioned at the upper layer;
C. preparing simulated residual distillation liquid, injecting the simulated residual distillation liquid into a curing steel barrel, inserting a stirring paddle, and uniformly stirring at a speed of 300 r/min;
D. b, opening the hopper in the step B, and slowly adding the mixed materials into a curing steel barrel at a constant speed of 80r/min within 20 min;
E. increasing the stirring speed of the stirring paddle to 120r/min, continuously accelerating the stirring for 25min, and then pulling out the stirring paddle;
F. and (4) sealing the steel drum, and maintaining at normal temperature to obtain the nuclear power station radioactive residual distillation liquid cement solidified body.
Example 1
Mineral powder, diatomite, zeolite powder, starch ether and a powdery polycarboxylic acid water reducing agent are mixed according to the mass percentage of 60%: 17.6%: 20%: 0.4%: 2 percent of the mixture is uniformly mixed to form a special curing additive, and water, boric acid, mannitol and sodium hydroxide are mixed according to the mass percentage of 93 percent: 5%: 1%: 1 percent of simulated raffinate is prepared, and the simulated raffinate, cement and special curing additive are mixed according to the mass ratio of 4: 7: 3, preparing the cement solidified body of the distillation residue liquid by stirring according to the steps.
Example 2
Mineral powder, diatomite, zeolite powder, starch ether and a powdery polycarboxylic acid water reducing agent are mixed according to the mass percentage of 50%: 31.7%: 15%: 0.3%: 3 percent of the mixture is uniformly mixed to form a special curing additive, and water, boric acid, mannitol and sodium hydroxide are mixed according to the mass percentage of 95.1 percent: 3.5%: 0.8%: preparing 0.6% of simulated raffinate, and mixing the simulated raffinate, cement and the special curing additive according to a mass ratio of 1.68: 3: 1 stirring according to the steps to prepare the cement solidified body of the distillation residue liquid.
Example 3
Mineral powder, diatomite, zeolite powder, starch ether and a powdery polycarboxylic acid water reducing agent are mixed according to the mass percentage of 40%: 45.8%: 10%: 0.2%: 4% of the mixture is uniformly mixed to form a special curing additive, and water, boric acid, mannitol and sodium hydroxide are mixed according to the mass percentage of 97.3%: 2%: 0.5%: preparing 0.2% of simulated raffinate, and mixing the simulated raffinate, cement and the special curing additive according to a mass ratio of 2.25: 4: 1 stirring according to the steps to prepare the cement solidified body of the distillation residue liquid.
Comparative example 1
Preparation of a cement solidification product of the raffinate as in example 3, except that the order of addition was changed during the stirring in step B so that cement was in the lower layer and admixture was in the upper layer.
Comparative example 2
Water, boric acid, mannitol and sodium hydroxide are added according to the mass percentage of 97.3%: 2%: 0.5%: preparing 0.2% of simulated raffinate, and mixing the simulated raffinate, cement, mineral powder and powder polycarboxylic acid according to a mass ratio of 45: 80: 20: 1 preparing the cement solidified body of the distillation residue liquid according to the steps.
Comparative example 3
Water, boric acid, mannitol and sodium hydroxide are added according to the mass percentage of 97.3%: 2%: 0.5%: preparing 0.2% of simulated raffinate, and mixing the simulated raffinate, cement, zeolite powder and powder polycarboxylic acid according to a mass ratio of 45: 90: 10: 1 preparing the cement solidified body of the distillation residue liquid according to the steps.
Comparative example 4
Water, boric acid, mannitol and sodium hydroxide are added according to the mass percentage of 97.3%: 2%: 0.5%: preparing 0.2% of simulated raffinate, and preparing the simulated raffinate, cement and powdered polycarboxylic acid into a raffinate cement solidified body by adopting a high-speed stirring mode of 1000r/min according to the mass ratio of 60:20: 3.
The cement cured products of the raffinates obtained in examples 1 to 3 and the cement cured products of the raffinates obtained in comparative examples 1 to 4 were subjected to performance tests, and the results are shown in table 1.
TABLE 1
Note: other performance indexes of all the embodiments can meet the national standard requirements.
As can be seen from Table 1, the cement cured bodies in the embodiments 1, 2 and 3 can meet the requirements that the initial fluidity of the cement cured bodies is 220-250 mm, the fluidity of the cement cured bodies in 1 hour is greater than 200mm, no bleeding stratification occurs, the final setting time is not greater than 24 hours, and the compatibilization rate is only 75-85%.
Compared with the example 3, the proportion of the concrete in the comparative example 1 is the same, but the initial setting time and the final setting time of the concrete are greatly prolonged because the cement is added firstly and then the modifier is added during the preparation, so that the requirement that the final setting time is not more than 24h cannot be met.
Comparative example 2 compared to example 3, the use of conventional ore powder instead of cement to prepare a solidified body without using a solidification specific additive resulted in severe bleeding stratification although the initial fluidity was improved.
Comparative example 3 compared with example 3, only the zeolite powder with large doping amount is used as the water retention thickening material, so that the problem of bleeding stratification of the cement solidified body is avoided, but the zeolite powder with large doping amount leads to the acceleration of the setting time of the cement solidified body, the loss of fluidity is increased, and the initial fluidity and the fluidity for 1h can not meet the requirements.
Compared with the embodiment 3, the comparative example 4 has the advantages that the water-to-gel ratio is greatly reduced, the slurry can have better fluidity and no bleeding stratification occurs only by pure cement curing, but the stirring mode requires high-speed stirring at 1000r/min, the stirring condition is harsh, the compatibilization rate of the cement curing body ratio is greatly increased and reaches 106%, and the subsequent treatment of the cement curing body is not favorable.
Further proves that the invention reduces the capacity increasing rate of the cement solidified body by improving the water-cement ratio; by adding the special curing additive and improving the stirring process, the problems of long condensation time and bleeding stratification easily caused by the cement cured body of the distillation residue liquid under the condition of high water-cement ratio are solved; the high fluidity, the high water retention and the low capacity-increasing rate of the cement solidified body of the distilled liquid are synchronously realized.
The above-mentioned embodiments are only preferred examples of the present invention, and are not intended to limit the present invention, and any equivalent substitutions, modifications and changes made within the principle of the present invention are within the protection scope of the present invention.
Claims (2)
1. The utility model provides a nuclear power station radioactive raffinate cement solidification body which characterized in that: comprises the following components in percentage by mass of 4-4.5: 7-8: 2-3 of radioactive raffinate, cement and special curing additive; wherein:
the mass percentages of water, boric acid, mannitol and sodium hydroxide in the radioactive raffinate are respectively 97.3%, 2%, 0.5% and 0.2%;
the special curing additive comprises the following components in percentage by mass: 40-60% of mineral powder, 17-45% of diatomite, 10-20% of zeolite powder, 0.2-0.4% of starch ether and 2-4% of powder polycarboxylic acid water reducer;
the initial fluidity of the nuclear power plant radioactive raffinate cement solidified body is 220-250 mm, the fluidity is more than 200mm within 1h, the phenomenon of bleeding stratification does not occur, the initial setting time is more than 6h, the final setting time is not more than 24h, and the capacity increase rate is 75-85%;
the preparation method of the nuclear power station radioactive raffinate cement solidified body comprises the following steps:
step A: preparing a special curing additive according to mass percentage;
and B: in the step A, the special curing additive and the cement are sequentially loaded into a hopper, the special curing additive is positioned at the lower layer, and the cement is positioned at the upper layer;
and C: injecting the components of the radioactive residual distillation liquid into a solidified steel barrel, and inserting a stirring paddle to stir at a constant speed of 300 r/min;
step D: b, opening the hopper in the step B, and slowly adding the mixed materials into a curing steel barrel at a constant speed of 80r/min within 20 min;
step E: increasing the stirring speed of the stirring paddle to 120r/min, and continuously accelerating the stirring for 25 min;
step F: sealing the steel drum, and maintaining at normal temperature.
2. The nuclear power plant radioactive raffinate cement solidified body according to claim 1, wherein the mass ratio of the radioactive raffinate, the cement and the solidification dedicated additive is 2.25: 4: 1, the mass percentages of the mineral powder, the diatomite, the zeolite powder, the starch ether and the powdery polycarboxylic acid water reducer in the special curing additive are respectively 40%, 45.8%, 10%, 0.2% and 4%.
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| CN108585722A (en) * | 2018-04-13 | 2018-09-28 | 武汉理工大学 | A kind of cement-based solidified material and its curing of the solidification containing high concentration of boric acid nuclear waste |
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| CN102262910B (en) * | 2011-05-13 | 2013-10-16 | 清华大学 | Method for solidifying spent radioactive resin by blending sulphoaluminate cement and admixtures |
| CN102254579B (en) * | 2011-06-09 | 2013-10-16 | 清华大学 | Method for carrying out cement solidification on radioactive raffinate by using NaAlO2 and Ca(OH)2 coagulant |
| CN106396445B (en) * | 2016-08-29 | 2019-08-06 | 上海市建筑科学研究院 | Medium-level waste disposal container concrete composite reinforcing material and preparation method thereof |
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