CN106898403B - It is a kind of remove nucleic uranium organic flocculant and its application - Google Patents
It is a kind of remove nucleic uranium organic flocculant and its application Download PDFInfo
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- CN106898403B CN106898403B CN201710186376.XA CN201710186376A CN106898403B CN 106898403 B CN106898403 B CN 106898403B CN 201710186376 A CN201710186376 A CN 201710186376A CN 106898403 B CN106898403 B CN 106898403B
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- 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
- G21F9/10—Processing by flocculation
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Abstract
The present invention provide it is a kind of remove nucleic uranium organic flocculant and its application, belong to radioactive waste Treatment process field.It is main flocculant, Mg that organic flocculant of the present invention, which is with polyacrylamide,2+For auxiliary agent, the two interacts the complex compound to be formed, structural formula are as follows:The present invention uses organic flocculant polyacrylamide (PAM) and Mg2+Low uranium-bearing radioactive wastewater of putting is handled jointly as auxiliary agent, complex compound is formed using two-way interaction, is acted synergistically by it and improve flocculating effect.Organic flocculant of the present invention can not only effectively be removed the nucleic uranium in nuclear industry waste liquid, the yield of radioactivity mud can also be effectively reduced simultaneously, reduce the storage space of radioactive waste, the radiological hazard hidden danger to ecological environment and human health is reduced, provides a kind of new approach for the purified treatment of nuclear industry uranium-bearing radioactive wastewater.
Description
Technical field
The invention belongs to radioactive waste Treatment process field, specially a kind of organic flocculant for removing nucleic uranium and its
Using.
Background technique
Currently, generation is largely low in nuclear industry production process puts uranium-bearing waste liquid, it is well known that nucleic uranium has extremely strong
Chemical toxicity and radioactivity, it is necessary to it is strictly monitored and is effectively removed, in order to avoid to ecological environment and human health by
Nuclear radiation pollution harm.Chemical floc method is considered as one of low radioactive waste liquid processing technique in most economical and easy to operate.
Traditional inorganic flocculating agent (the FeSO now used4+KMnO4) there is processing mode processing equipment to take up a large area, radioactivity mud produces
The disadvantages of raw amount is more and is also easy to produce secondary pollution.Therefore, organic polymer coargulator use then be it is a kind of it is more important and
The wastewater treatment method of prospect is had much, there is better strategic importance and engineering application value.For the low place for putting uranium-containing waste water
Reason method mostly uses greatly the flocculating and purifying technology of inorganic flocculating agent, this method bulky, mud yield with processing equipment
The defects of mostly and being also easy to produce secondary pollution.
Summary of the invention
For the shortcoming of existing inorganic flocculating agent, the present invention provides a kind of organic flocculant for removing nucleic uranium,
Organic flocculant of the present invention is using polyacrylamide as flocculant, and using divalent magnesium ion as auxiliary agent, two-way interaction forms complexing
Object is acted synergistically by it and improves flocculating effect, to improve the removal rate to nucleic uranium.Organic flocculant of the present invention can be real
Existing radioactive wastewater Radionuclide uranium effectively removes, while can also reduce the yield of radioactivity mud.The object of the invention passes through
Following technical proposals are realized:
A kind of organic flocculant removing nucleic uranium, it is main flocculant, Mg that the organic flocculant, which is with polyacrylamide,2+
For auxiliary agent, the two interacts the complex compound to be formed, and structural formula is as follows:
A kind of application for the organic flocculant removing nucleic uranium, the organic flocculant are applied to radioactive wastewater Radionuclide
The removal of uranium.
A kind of application for the organic flocculant removing nucleic uranium, the organic flocculant are applied to reduce radioactivity mud
Yield.
Further, the actual conditions of the organic flocculant application are as follows: waste liquor PH is 12 ± 0.02, the throwing of polyacrylamide
Dosage is 0.1~0.5ppm, Mg2+Dosage be 0.14~0.24g/L.Further preferably are as follows: waste liquor PH 12, polyacrylamide
Amine dosage is 0.2ppm, Mg2+Dosage be 0.18g/L；Or waste liquor PH is 12, polyacrylamide dosage is 0.3ppm,
Mg2+Dosage be 0.20g/L；Or waste liquor PH is 12, polyacrylamide dosage is 0.4ppm, Mg2+Dosage be
0.22g/L。
Further, the actual conditions of the organic flocculant application further include: be quickly transferred to after 1~5min of stirring and stir slowly
Mix 1~5min, last 25~35min of standing sedimentation.Wherein, the revolving speed quickly stirred is preferably 350rpm/min, is stirred slowly
Revolving speed is preferably 60rpm/min.
Compared with prior art, the invention has the following advantages:
Main flocculant, Mg are used as using polyacrylamide (PAM) using organic flocculant2+Low put is contained jointly as auxiliary agent
Uranium radioactive wastewater is handled, and is formed complex compound using two-way interaction, is acted synergistically by it and improve flocculating effect.This
Invention organic flocculant can not only effectively be removed the nucleic uranium in nuclear industry waste liquid, while radiation can also be effectively reduced
Property mud yield, reduce the storage space of radioactive waste, reduce the radiological hazard to ecological environment and human health
Hidden danger provides a kind of new approach for the purified treatment of nuclear industry uranium-bearing radioactive wastewater.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application of 1 organic flocculant of embodiment in the removal of radioactive wastewater nucleic uranium
The present embodiment investigates solution ph, PAM and auxiliary agent Mg using uranium removal rate as evaluation index2+Dosage, stirring mode
And influence of the principal elements such as uranium initial concentration to uranium effect is gone, optimum flocculating condition determine are as follows: pH is 12 ± 0.02, PAM
And MgCl2·6H2O dosage is respectively 0.1~0.5ppm and 0.14~0.24g/L, quickly stirs 350rpm/min, stirs slowly
1min, maximum go uranium rate nearly 100%.
Specific flocculating experiment process: the initial concentration of waste water sample Radionuclide uranium is 350~2000 μ g/L.Take 500mL low
Uranium-containing waste water sample is put in 1000mL beaker, using HCl and NaOH tune pH to desirable value, adds flocculant, is quickly stirred
It is transferred to after (350rpm/min) 1min and stirs (60rpm/min) 1min, standing sedimentation 30min slowly.Supernatant is taken, using trace uranium point
Analyzer measures the uranium concentration in water sample before and after the processing.The mud generated after flocculation treatment is transferred in graduated cylinder, a period of time is stood
Afterwards, mud volume is recorded, then mud is filtered, dry, is weighed using vacuum filtration method, calculates sediment quality.
Flocculating experiment in the present invention has investigated pH value of solution, flocculant dosage, stirring mode and initial uranium concentration pair
The influence of uranium effect is gone, finally determines optimum flocculating condition.
1, auxiliary agent Mg2+Influence of the dosage to uranium effect is gone
In order to more preferably investigate auxiliary agent Mg2+To the removal effect of nucleic uranium, pH is set as 12, PAM and thrown dosage by this experiment
When dosage is respectively 1ppm, 2ppm, 3ppm, using the Mg of different additional amounts2+(other conditions holdings are handled to uranium-containing waste water
Unanimously), the results are shown in Table 1, and wherein PAMM indicates complex compound organic flocculant of the present invention.
1 auxiliary agent Mg of table2+Dosage goes the influence of uranium effect to PAMM
| Mg2+Dosage (g/L) | PAM(1ppm) | PAM(2ppm) | PAM(3ppm) |
| 0.02 | 39.56 | 42.67 | 46.89 |
| 0.05 | 75.34 | 76.78 | 79.67 |
| 0.07 | 80.82 | 82.82 | 83.82 |
| 0.09 | 90.31 | 89.16 | 91.35 |
| 0.12 | 94.31 | 94.26 | 93.36 |
| 0.14 | 96.38 | 95.11 | 94.5 |
| 0.19 | 97.01 | 97.3 | 94.96 |
| 0.21 | 97.79 | 96.77 | 95.79 |
| 0.24 | 97.68 | 96.82 | 95.06 |
From table 1 it follows that when pH is 12, Mg2+When dosage is 0.14g/L or more, the PAM of various concentration is reachable
Uranium rate is gone to 94% or more, takes into account economic cost and treatment effect, by Mg2+Optimum dosage range be set to 0.14~
0.24g/L。
2, influence of the PAM dosage to uranium effect is gone
As pH=12, add the Mg of 0.14g/L2+When, investigate different molecular weight (MW=3 × 106~1 × 107) PAM throwing
Dosage goes the influence (other conditions are consistent) of uranium effect to uranium-containing waste water, and the results are shown in Table 2, and wherein PAMM indicates this hair
Bright complex compound organic flocculant.
PAM dosage goes the influence of uranium effect to PAMM under 2 different molecular weight of table
By upper table 2 it is found that at the PAM of different molecular weight, the removal rate of waste water Radionuclide uranium with PAM input amount increasing
Adding and improve, illustrates that the PAM amount being added is more, the removal effect of nucleic uranium is better, but additional amount is more, and cost is also higher,
Therefore, from the point of view of taking into account economic cost and treatment effect balance, the best input amount of PAM is set as 0.1 by the present invention~
0.5ppm。
3, influence of the pH to uranium effect is gone
As pH=12, add the Mg of 0.14g/L2+When, investigate PAMM pairs that the PAM of different molecular weight is generated at different pH
The removal effect (other conditions are consistent) of nucleic uranium, as a result as shown in table 3 below.
PH value of solution goes the influence of uranium effect to PAMM under 3 difference PAM molecular weight of table
By upper 3 data result of table it is found that the PAMM that solution ph generates different molecular weight PAM complexing removes uranium influential effect
Difference, on the whole, when pH value of solution is 12, the complex compound PAMM under different molecular weight, which can reach, excellent goes uranium to imitate
Fruit, and the pH initial value of the waste water of nuclear industry discharge is generally 9~10, it is contemplated that economic cost and treatment effect, by waste water
The optimal pH of processing is set to 12.
4, influence of the stirring mode to uranium effect is gone.
This experiment stirs the time to quick mixing speed and slowly respectively and carries out uranium effect and compare, as a result respectively such as the following table 4 and
Shown in table 5.
Influence of the quick mixing speed of table 4 to uranium effect is gone
Watch 5 stirs influence of the time to uranium effect is gone slowly
It can be seen from upper table 4 and upper table 5 when quick mixing speed be 350rpm/min, stir slowly the time be 1min when, core
The removal effect of plain uranium is best.
5, uranium initial concentration goes the influence of uranium effect to PAMM
When pH is 12, PAM and MgCl2·6H2O dosage is respectively 0.1~0.5ppm and 1.6g/L, is quickly stirred
350rpm/min, slowly when stirring 1min, the influence that different uranium initial concentrations go uranium effect to PAMM, for example small 5 institute of table of result are investigated
Show.
5 uranium initial concentration of table goes the influence of uranium effect to PAMM
| Uranium initial concentration (μ g/L) | 350 | 700 | 1000 | 1400 | 2000 | 2800 |
| Remove uranium rate/% | 98.04 | 97.54 | 97.08 | 95.59 | 91.31 | 89.15 |
As shown in Table 5, when the initial concentration of Uranium in Waste Water is less than 1000 μ g/L, organic flocculant of the present invention can reach pair
The removal rate of nucleic uranium can reach 97% or more, but when its concentration is greater than 1000 μ g/L, due to excessive concentration, the content of uranium is too
More, removal rate is decreased obviously.
The organic flocculant of the present invention of embodiment 2 is reducing the application in radioactivity mud yield
The optimal flocculating conditions determined using above-described embodiment 1, the i.e. optimal place of radioactive wastewater Radionuclide uranium removal rate
(pH is 12 ± 0.02, PAM and MgCl to manage bar part2·6H2O dosage is respectively 0.1~0.5ppm and 0.14~0.24g/L, fast
Speed stirring 350rpm/min, 1min is stirred slowly) Spent Radioactive water sample (initial uranium concentration is 377 μ g/L) is handled, measurement is originally
The radioactivity mud volume and sediment weight that invention organic flocculant generates in flocculation process.Meanwhile the present embodiment is using existing
Inorganic flocculating agent (FeSO4+KMnO4) and individually polyacrylamide (PAM) and individual Mg (OH)2As a comparison, it is studied
The radioactivity mud volume and sediment weight generated in removal rate and processing flocculation process to radioactive wastewater Radionuclide uranium.Its
Test result is as follows (the M in following table shown in table 6WRefer to the molecular weight of PAM).
Processing result of the different flocculants of table 6 to same a collection of radioactive wastewater
As can be seen that using organic flocculant of the present invention (PAM and Mg from upper table 62+Joint) processing radioactive wastewater,
94% or more can achieve to the removal rate of nucleic uranium, highest can achieve 99.18%.Meanwhile the slurry body generated after processing
In 2~4.5ml, sediment quality is reduced to 0.05g or so, but uses inorganic flocculating agent (FeSO for product control4+KMnO4) handled
When, although its nucleic uranium removal rate can achieve 98.18%, the volume of mud is 20ml after processing, and sediment quality is
0.1045g；Using individual Mg (OH)2It is handled, nucleic uranium removal rate can only achieve 89.46%, and mud after processing
Volume be 45ml, and sediment quality be 0.2554；It is handled using individual PAM, nucleic uranium removal rate is
41.80%, the volume of mud is 10ml after processing, and sediment quality is 0.1009g.This present invention organic flocculant uses PAM
With Mg2+Combined Treatment uranium effect not only can be improved, but also the yield of radioactivity mud and sediment can be significantly reduced.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of application for the organic flocculant for removing nucleic uranium, which is characterized in that the organic flocculant is with polyacrylamide
Amine is main flocculant, Mg2+For auxiliary agent, the two interacts the complex compound to be formed, and structural formula is as follows:
The organic flocculant is applied to reduce the yield of radioactivity mud；Wherein, application conditions are as follows: waste liquor PH be 12 ±
0.02, the dosage of polyacrylamide is 0.1~0.5ppm, Mg2+Dosage be 0.14~0.24g/L.
2. a kind of application for the organic flocculant for removing nucleic uranium as described in claim 1, which is characterized in that the organic-flocculation
Agent is applied to the removal of radioactive wastewater Radionuclide uranium.
3. a kind of application for the organic flocculant for removing nucleic uranium as described in claim 1, which is characterized in that the organic-flocculation
The condition of agent application are as follows: waste liquor PH 12, polyacrylamide dosage are 0.2ppm, Mg2+Dosage be 0.18g/L.
4. a kind of application for the organic flocculant for removing nucleic uranium as described in claim 1, which is characterized in that the organic-flocculation
The condition of agent application are as follows: waste liquor PH 12, polyacrylamide dosage are 0.3ppm, Mg2+Dosage be 0.20g/L.
5. a kind of application for the organic flocculant for removing nucleic uranium as described in claim 1, which is characterized in that the organic-flocculation
The condition of agent application are as follows: waste liquor PH 12, polyacrylamide dosage are 0.4ppm, Mg2+Dosage be 0.22g/L.
6. a kind of application for the organic flocculant for removing nucleic uranium as described in claim 1, which is characterized in that the organic-flocculation
The application conditions of agent further include: be transferred to slow stirring 1~5min, last 25~35min of standing sedimentation after quickly stirring 1~5min.
7. a kind of application for the organic flocculant for removing nucleic uranium as claimed in claim 6, which is characterized in that the quick stirring
Revolving speed be 350rpm/min, the revolving speed stirred slowly be 60rpm/min.
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| US8658580B2 (en) * | 2012-03-01 | 2014-02-25 | Uchicago Argonne, Llc | Superabsorbing gel for actinide, lanthanide, and fission product decontamination |
| FR2993184B1 (en) * | 2012-07-10 | 2015-12-25 | Commissariat Energie Atomique | METHOD AND DEVICE FOR MICRO-FLUID ANALYSIS, IN PARTICULAR URANIUM AND PLUTONIUM IN RADIOACTIVE SAMPLES |
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