CN112435769A - Radioactive waste filter element cement fixing formula, fixing device and fixing method - Google Patents
Radioactive waste filter element cement fixing formula, fixing device and fixing method Download PDFInfo
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- CN112435769A CN112435769A CN202011312763.1A CN202011312763A CN112435769A CN 112435769 A CN112435769 A CN 112435769A CN 202011312763 A CN202011312763 A CN 202011312763A CN 112435769 A CN112435769 A CN 112435769A
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- cement
- water
- reducing agent
- fixing
- filter element
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- 239000004568 cement Substances 0.000 title claims abstract description 72
- 239000002901 radioactive waste Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 239000003469 silicate cement Substances 0.000 claims abstract 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 24
- 239000011398 Portland cement Substances 0.000 claims description 23
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 9
- 230000002285 radioactive effect Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000009472 formulation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910021487 silica fume Inorganic materials 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011396 hydraulic cement Substances 0.000 claims 1
- 230000003100 immobilizing effect Effects 0.000 claims 1
- 238000002474 experimental method Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001412 inorganic anion Inorganic materials 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- -1 suspended matters Substances 0.000 description 1
Images
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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- G21F9/28—Treating solids
- G21F9/30—Processing
- G21F9/301—Processing by fixation in stable solid media
- G21F9/302—Processing by fixation in stable solid media in an inorganic matrix
- G21F9/304—Cement or cement-like matrix
Landscapes
- 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)
- Processing Of Solid Wastes (AREA)
Abstract
The invention particularly relates to a cement fixing formula for a radioactive waste filter element, which comprises ordinary silicate cement, water, an additive and silicon powder, wherein the weight ratio of the ordinary silicate cement to the water to the additive to the silicon powder is 1:0.26: 0.01-0.02: 0.1-0.2. The fixing formula of the radioactive waste filter element is low in cost, meets the requirement of automatic operation, and has main performance indexes meeting the requirements of EJ1186-2005, and experimental results show that the fluidity of cement paste is 395 mm; the fixed body 28d has a compressive strength of 92.4 MPa.
Description
Technical Field
The invention belongs to the technical field of radioactive waste treatment of nuclear power stations, and particularly relates to a radioactive waste filter core cement fixing formula, a fixing device and a fixing method.
Background
In the operation process of a pressurized water reactor nuclear power plant, a filter needs to be arranged on radioactive liquid in a loop to intercept particle impurities in the liquid, the particle impurities contain high radioactive nuclides, when the impurities are intercepted more, the pressure difference of the filter rises or the dosage rate level rises, the filter needs to be replaced when the pressure difference exceeds a set value, and a replaced waste filter element is one of main process wastes of the pressurized water reactor nuclear power plant. In order to reduce migration or dispersion of radionuclides during storage, transport and disposal of radioactive waste, immobilization of the radioactive spent cartridge is often required, with cement immobilization being one of the commonly used immobilization methods.
The prior fixing formula for the radioactive waste filter element has the following problems: 1. quartz sand or washed sand is used, so that a cement mortar conveying pipeline is easily blocked; 2. PSB42.5 cement is used in the formula, so that no local bulk cement supply exists, and the automatic operation of a cement curing production line is influenced.
Disclosure of Invention
Based on this, it is necessary to provide a radioactive waste filter core cement fixing formula, a fixing device and a fixing method, aiming at the problems of easy blockage of a cement mortar conveying pipeline and no local bulk cement supply in the existing radioactive waste filter core cement mortar fixing formula.
In order to solve the above problems, the present invention provides the following technical solutions:
the cement fixing formula for the radioactive waste filter element comprises ordinary portland cement, water, an additive and silicon powder, wherein the weight ratio of the ordinary portland cement to the water to the additive to the silicon powder is 1:0.26: 0.01-0.02: 0.1-0.2.
Furthermore, the strength grade of the ordinary portland cement is 42.5, the 3-day compressive strength is not less than 17Mpa, the 28-day compressive strength is not less than 42.5Mpa, the 3-day flexural strength is not less than 3.5Mpa, and the 28-day flexural strength is not less than 6.5 Mpa.
Furthermore, the ordinary portland cement is a hydraulic cementing material prepared by grinding portland cement clinker, 5-20% of mixed materials and a proper amount of gypsum.
Further, the water is nuclear power plant demineralized water.
Further, the additive is a water reducing agent.
Further, the water reducing agent is Glenium C333.
Further, the silicon powder is SF93 type silicon dioxide micropowder, the content of silicon dioxide is more than 90 wt%, and the specific surface area is more than 15000m2And the 45um sieve residue is less than 3.0 percent per kg, and the other indexes meet the regulations of the standard GB/T21236 'recycled silica micropowder for electric furnaces'.
The invention also provides a fixing device for the radioactive waste filter element cement fixing formula, which comprises a water feeding pipeline, a feeding pipeline for a mixture of cement and silicon powder, stirring equipment, a water reducing agent tank, a water reducing agent feeding pipeline and a radioactive waste filter element storage barrel, wherein the water feeding pipeline is connected with the stirring equipment through a pipeline, the feeding pipeline for the mixture of the cement and the silicon powder is connected with the stirring equipment through a screw conveyor, the water reducing agent tank is connected with the water reducing agent feeding pipeline through a pipeline, the water reducing agent feeding pipeline and the water feeding pipeline are converged and connected with the stirring equipment, and the stirring equipment is connected with the radioactive waste filter element storage barrel through a hose.
Further, the feed line for the mixture of cement and silica fume comprises a screw conveyor; the water reducer feed line includes a pump.
The invention also provides a fixing method of the radioactive waste filter element cement fixing formula, which comprises the following steps:
adding ordinary portland cement, silicon powder, a water reducing agent and water into stirring equipment through pipelines according to the proportion and metering respectively, stirring and mixing, discharging from the stirring equipment when the fluidity of the mixed cement paste is more than or equal to 310mm to obtain the cement paste, repeating the steps, and realizing the automatic production of the cement paste in a continuous feeding, stirring and continuous discharging mode; the produced cement slurry is conveyed into a metal barrel pre-filled with the radioactive waste filter element through a pipeline, and is uniformly vibrated, so that the fixation of the radioactive waste filter element is completed.
Further, the method comprises the following steps of adding the ordinary portland cement, the silica powder, the water reducing agent and water into the stirring equipment through pipelines according to the proportioning:
premixing ordinary portland cement and silicon powder to obtain a mixture; the mixture is loaded into a cement hopper and is conveyed to stirring equipment through a screw conveyor of a feeding pipeline of the mixture of the cement and the silicon powder; the water reducing agent is filled into a water reducing agent tank and is conveyed to stirring equipment through a pump of a water reducing agent feeding pipeline; water joins through water feed line and water-reducing agent feed line, carries agitated vessel.
The invention has the beneficial technical effects that:
the fixing formula of the radioactive waste filter element is low in cost, meets the requirement of automatic operation, and has main performance indexes meeting the requirements of EJ1186-2005, and experimental results show that the fluidity of cement paste is 395 mm; the fixed body 28d has a compressive strength of 92.4 MPa.
Drawings
Fig. 1 is a fixing device for fixing a formulation of a radioactive spent cartridge according to the present invention.
Wherein:
1. a water feed line; 2. a feed line for a mixture of cement and silica fume; 3. a stirring device; 4. a water reducing agent tank; 5. a water reducing agent feed line; 6. the useless filter core of radioactivity stores the bucket.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the following specific examples.
Example 1
The formula for fixing the radioactive waste filter element cement comprises ordinary portland cement, water, a water reducing agent and silicon powder, wherein the weight ratio of the ordinary portland cement to the water reducing agent to the silicon powder is 1:0.26: 0.01-0.02: 0.1-0.2.
Wherein: the strength grade of the ordinary Portland cement is 42.5, the 3-day compressive strength is not less than 17MPa, the 28-day compressive strength is not less than 42.5MPa, the 3-day flexural strength is not less than 3.5MPa, and the 28-day flexural strength is not less than 6.5 MPa.
The ordinary portland cement is a hydraulic cementing material prepared by grinding portland cement clinker, 5-20% of mixed materials and a proper amount of gypsum.
The water is desalted water of a nuclear power plant, the desalted water of the nuclear power plant is finished product water obtained by removing impurities in water such as suspended matters, colloid, inorganic cations and anions by various water treatment processes, the water quality meets the standard of secondary desalted water, the conductivity is less than 0.2us/cm (25 ℃), and SiO is less than 0.2us/cm2Less than 20 ug/L. The dosage is adjusted according to the thickness of the mixed cement slurry, if the cement slurry is thicker, the dosage of the demineralized water is increased, and if the cement slurry is thinner, the dosage of the demineralized water is reduced.
The additive is a water reducing agent Glenium C333, is used for reducing the unit water consumption of a solidified body, meets the requirement of the consistency of cement, provides the workability of cement paste, is adjusted according to the thickness of the mixed cement paste, is increased if the cement paste is thick, and is reduced if the cement paste is thin.
The silicon powder is SF93 type silicon dioxide micropowder, the silicon dioxide content is more than 90 percent, and the specific surface area is more than 15000m2The 45um sieve residue is less than 3.0 percent per kg, and other indexes meet the regulations of the standard GB/T21236 'recycled silica micro powder of electric furnace'. The silica powder is added into the ordinary Portland cement fixing body, so that the cement quality can be improvedCompressive strength, impermeability and impact resistance of the anchoring body.
The fixing device for the radioactive waste filter element cement fixing formula comprises a water feeding pipeline 1, a feeding pipeline 2 of a mixture of cement and silica powder, stirring equipment 3, a water reducing agent tank 4, a water reducing agent feeding pipeline 5 and a radioactive waste filter element storage barrel 6, wherein the water feeding pipeline 1 is connected with the stirring equipment 3 through a pipeline, the feeding pipeline 2 of the mixture of the cement and the silica powder is connected with the stirring equipment 3 through a screw conveyer, the water reducing agent tank 4 is connected with the water reducing agent feeding pipeline 5 through a pipeline, the water reducing agent feeding pipeline 5 is converged with the water feeding pipeline 1 and is connected with the stirring equipment 3, and the stirring equipment 3 is connected with the radioactive waste filter element storage barrel 6 through a hose.
The feed line 2 for the mixture of cement and silica fume comprises a screw conveyor. The water-reducing agent feed line 5 comprises a pump.
The fixing method of the radioactive waste filter element cement fixing formula is carried out on the fixing device of the radioactive waste filter element cement fixing formula, and comprises the following steps:
respectively adding ordinary portland cement, silicon powder, a water reducing agent and water into a stirring device 3 through a pipeline according to the proportion and metering, stirring and mixing, discharging from the stirring device when the fluidity of the mixed cement paste is more than or equal to 310mm to obtain the cement paste, repeating the steps, and realizing the automatic production of the cement paste through continuous feeding, stirring and continuous discharging; the produced cement slurry is conveyed into a metal barrel pre-filled with the radioactive waste filter element through a pipeline, and is uniformly vibrated, so that the fixation of the radioactive waste filter element is completed.
Further, the ordinary portland cement, the silica powder, the water reducing agent and the water are respectively added into the stirring equipment 3 through pipelines according to the proportioning, and the method specifically comprises the following steps:
premixing ordinary portland cement and silicon powder to obtain a mixture; the mixture is loaded into a cement hopper and is conveyed to a stirring device 3 through a screw conveyer of a feeding pipeline 2 of the mixture of cement and silicon powder; the water reducing agent is filled into a water reducing agent tank 4 and is conveyed to the stirring equipment 3 through a pump of a water reducing agent feeding pipeline 5; water joins through water feed line 1 and water-reducing agent feed line 5, carries agitated vessel 3.
Example 2
Testing the fluidity, compressive strength and impermeability of the cement paste according to the fixed formula of the radioactive waste filter element cement paste in the embodiment 1 to verify whether the formula performance meets the requirements of EJ1186-2005 & ltcharacterization of radioactive waste objects and waste bags & gt, namely, the fluidity of the cement paste is more than or equal to 310 mm; the compression strength of the fixed body 28d is more than or equal to 60 MPa; the impervious performance of the immobilized body is 28d Cl-migration electric quantity is less than or equal to 2500C.
1. The fluidity of the cement paste is as follows: in the experiment, the cement paste in the embodiment 1 is taken for fluidity experiment, and the experiment result shows that the cement paste has moderate consistency and 395mm fluidity.
2. Compressive strength: in the experiment, three groups of cement solidified bodies in the example 1 are taken for carrying out a compressive strength experiment, and the experimental result shows that the 28d average compressive strength is 92.4 MPa.
3. Anti-permeability performance: in the experiment, three groups of cement solidified bodies in the example 1 are taken for carrying out impermeability tests, and the test result shows that the average impermeability is 28d, and the chloride ion migration electric quantity is 65.9C.
The formula performance meets the requirements of EJ1186-2005 'characteristic identification of radioactive waste and waste bags'.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The cement fixing formula for the radioactive waste filter element is characterized by comprising ordinary silicate cement, water, an additive and silicon powder, wherein the weight ratio of the ordinary silicate cement to the water to the additive to the silicon powder is 1:0.26: 0.01-0.02: 0.1-0.2.
2. The radioactive spent filter core cement fixing formula according to claim 1, wherein the strength grade of the ordinary portland cement is 42.5, the 3-day compressive strength is not less than 17Mpa, the 28-day compressive strength is not less than 42.5Mpa, the 3-day flexural strength is not less than 3.5Mpa, and the 28-day flexural strength is not less than 6.5 Mpa.
3. The radioactive spent filter core cement fixing formulation according to claim 2, wherein the ordinary portland cement is a hydraulic cement prepared by grinding portland cement clinker, 5-20% of mixed materials and a proper amount of gypsum.
4. The radioactive spent filter cement fixing formulation according to claim 1, wherein the water is nuclear power plant demineralized water.
5. The radioactive spent filter core cement fixing formulation according to claim 1, wherein the water reducing agent is Glenium C333.
6. The cement fixing formula for the radioactive waste filter element according to claim 1, wherein the silicon powder is SF93 type silica micropowder, the content of silica is more than 90 wt%, the specific surface area is more than 15000m2/kg, the 45um screen residue is less than 3.0%, and other indexes meet the specification of GB/T21236 electric furnace recycled silica micropowder.
7. The fixing device for the radioactive waste filter element cement fixing formula according to any one of claims 1 to 6, comprising a water feeding line, a feeding line for a mixture of cement and silica powder, a stirring device, a water reducing agent tank, a water reducing agent feeding line, and a radioactive waste filter element storage barrel, wherein the water feeding line is connected with the stirring device through a pipe, the feeding line for the mixture of cement and silica powder is connected with the stirring device through a screw conveyor, the water reducing agent tank is connected with the water reducing agent feeding line through a pipe, the water reducing agent feeding line is converged with the water feeding line and connected with the stirring device, and the stirring device is connected with the radioactive waste filter element storage barrel through a hose.
8. The fixing device according to claim 7, characterized in that the feed line of the mixture of cement and silica fume comprises a screw conveyor; the water reducer feed line includes a pump.
9. The method for immobilizing a radioactive spent filter cement fixing formulation according to any one of claims 1 to 6, comprising the steps of: adding ordinary portland cement, silicon powder, a water reducing agent and water into stirring equipment through pipelines according to the proportion and metering respectively, stirring and mixing, discharging from the stirring equipment when the fluidity of the mixed cement paste is more than or equal to 310mm to obtain the cement paste, repeating the steps, and realizing the automatic production of the cement paste in a continuous feeding, stirring and continuous discharging mode; the produced cement slurry is conveyed into a metal barrel pre-filled with the radioactive waste filter element through a pipeline, and is uniformly vibrated, so that the fixation of the radioactive waste filter element is completed.
10. The fixing method according to claim 9, wherein the ordinary portland cement, the silica powder, the water reducing agent and the water are respectively added into the stirring equipment through pipelines according to the proportioning, and the method specifically comprises the following steps: premixing ordinary portland cement and silicon powder to obtain a mixture; the mixture is loaded into a cement hopper and is conveyed to stirring equipment through a screw conveyor of a feeding pipeline of the mixture of the cement and the silicon powder; the water reducing agent is filled into a water reducing agent tank and is conveyed to stirring equipment through a pump of a water reducing agent feeding pipeline; water joins through water feed line and water-reducing agent feed line, carries agitated vessel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011312763.1A CN112435769A (en) | 2020-11-20 | 2020-11-20 | Radioactive waste filter element cement fixing formula, fixing device and fixing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011312763.1A CN112435769A (en) | 2020-11-20 | 2020-11-20 | Radioactive waste filter element cement fixing formula, fixing device and fixing method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103588433A (en) * | 2013-11-15 | 2014-02-19 | 中国原子能科学研究院 | Formula for fixing solid radioactive wastes by using cement mortar |
| CN103886927A (en) * | 2012-12-21 | 2014-06-25 | 中核核电运行管理有限公司 | Radioactive waste resin curing formula |
| CN106630841A (en) * | 2016-12-26 | 2017-05-10 | 中核四0四有限公司 | Medium-low-radioactivity solid waste immobilization formula and preparation method thereof |
| CN107891518A (en) * | 2017-11-26 | 2018-04-10 | 杨朴 | A kind of wallboard production method |
| TWI650771B (en) * | 2017-07-27 | 2019-02-11 | 行政院原子能委員會核能研究所 | Apparatus of neutralizing, adsorbing, stirring and filtering highly-active radioactive waste |
-
2020
- 2020-11-20 CN CN202011312763.1A patent/CN112435769A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886927A (en) * | 2012-12-21 | 2014-06-25 | 中核核电运行管理有限公司 | Radioactive waste resin curing formula |
| CN103588433A (en) * | 2013-11-15 | 2014-02-19 | 中国原子能科学研究院 | Formula for fixing solid radioactive wastes by using cement mortar |
| CN106630841A (en) * | 2016-12-26 | 2017-05-10 | 中核四0四有限公司 | Medium-low-radioactivity solid waste immobilization formula and preparation method thereof |
| TWI650771B (en) * | 2017-07-27 | 2019-02-11 | 行政院原子能委員會核能研究所 | Apparatus of neutralizing, adsorbing, stirring and filtering highly-active radioactive waste |
| CN107891518A (en) * | 2017-11-26 | 2018-04-10 | 杨朴 | A kind of wallboard production method |
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| Title |
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