CN106898403A - A kind of organic flocculant for removing nucleic uranium and its application - Google Patents

A kind of organic flocculant for removing nucleic uranium and its application Download PDF

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Publication number
CN106898403A
CN106898403A CN201710186376.XA CN201710186376A CN106898403A CN 106898403 A CN106898403 A CN 106898403A CN 201710186376 A CN201710186376 A CN 201710186376A CN 106898403 A CN106898403 A CN 106898403A
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uranium
organic
application
flocculant
organic flocculant
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CN201710186376.XA
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CN106898403B (en
Inventor
杨爱丽
武俊红
杨鹏
朱玉宽
李萍
王东文
张峰
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Institute of Materials of CAEP
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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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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The present invention provides a kind of organic flocculant for removing nucleic uranium and its application, belongs to radwaste Treatment process field.It with polyacrylamide is main flocculant, Mg that organic flocculant of the present invention is2+It is auxiliary agent, both interact the complex compound of formation, its structural formula is：The present invention is using organic flocculant polyacrylamide (PAM) and Mg2+Low uranium-bearing radioactive wastewater of putting is processed jointly as auxiliary agent, complex compound is formed using two-way interaction, acted synergistically by it and improve flocculating effect.Organic flocculant of the present invention effectively can not only be removed to the nucleic uranium in nuclear industry waste liquid, the yield of radioactivity mud can also be effectively reduced simultaneously, reduce the storage space of radwaste, reduce to ecological environment and the radiological hazard hidden danger of human health, for the purified treatment of nuclear industry uranium-bearing radioactive wastewater provides a kind of new approach.

Description

A kind of organic flocculant for removing nucleic uranium and its application
Technical field
The invention belongs to radwaste Treatment process field, specially a kind of organic flocculant for removing nucleic uranium and its Using.
Background technology
At present, produced in nuclear industry production process and substantial amounts of low put uranium-bearing waste liquid, it is well known that nucleic uranium has extremely strong Chemical toxicity and radioactivity, it is necessary to strict monitoring and effectively removal are carried out to it, in order to avoid ecological environment and human health are subjected to Nuclear radiation pollution endangers.Chemical floc method is considered as one of middle low radioactive waste liquid treatment technology most economical and easy to operate. Traditional inorganic flocculating agent (the FeSO for now using4+KMnO4) processing mode has that processing equipment floor space is big, radioactivity mud is produced The shortcomings of raw amount is more and is also easy to produce secondary pollution.Therefore, the use of organic polymer coargulator be then it is a kind of it is more important and The method of wastewater treatment of prospect is had much, with more preferable strategic importance and engineering application value.For the low place for putting uranium-containing waste water Mostly using the flocculating and purifying technology of inorganic flocculating agent, the method has that processing equipment is bulky, mud yield to reason method It is many and be also easy to produce the defects such as secondary pollution.
The content of the invention
For the weak point of existing inorganic flocculating agent, the present invention provides a kind of organic flocculant for removing nucleic uranium, With polyacrylamide as flocculant, with divalence magnesium ion as auxiliary agent, two-way interaction forms complexing to organic flocculant of the present invention Thing, is acted synergistically by it and improves flocculating effect, so as to improve the clearance to nucleic uranium.Organic flocculant of the present invention can be real Effective removal of existing radioactive wastewater Radionuclide uranium, while the yield of radioactivity mud can also be reduced.The object of the invention passes through Following technical proposals are realized：
A kind of organic flocculant for removing nucleic uranium, it with polyacrylamide is main flocculant, Mg that the organic flocculant is2+ It is auxiliary agent, both interact the complex compound of formation, its structural formula is as follows：
A kind of application of the organic flocculant for removing nucleic uranium, the organic flocculant is applied to radioactive wastewater Radionuclide The removal of uranium.
A kind of application of the organic flocculant for removing nucleic uranium, the organic flocculant is applied to reduce radioactivity mud Yield.
Further, the actual conditions of the organic flocculant application is：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.More preferably：Waste liquor PH is 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 also includes：It is transferred to after 1~5min of quick stirring and is stirred slowly Mix 1~5min, last 25~35min of standing sedimentation.Wherein, the rotating speed of quick stirring is preferably 350rpm/min, slow stirring Rotating speed is preferably 60rpm/min.
Compared with prior art, the invention has the advantages that：
Using organic flocculant using polyacrylamide (PAM) as main flocculant, Mg2+Low putting is contained jointly as auxiliary agent Uranium radioactive wastewater is processed, and complex compound is formed using two-way interaction, is acted synergistically by it and is improved flocculating effect.This Invention organic flocculant effectively can not only be removed to the nucleic uranium in nuclear industry waste liquid, while radiation can also be reduced effectively Property mud yield, reduce the storage space of radwaste, reduce radiological hazard to ecological environment and human health Hidden danger, for the purified treatment of nuclear industry uranium-bearing radioactive wastewater provides a kind of new approach.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be 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 the organic flocculant of embodiment 1 in the removal of radioactive wastewater nucleic uranium
The present embodiment investigates solution ph, PAM and auxiliary agent Mg with uranium clearance as evaluation index2+Dosage, stirring mode And the principal element such as uranium initial concentration, to going the influence of uranium effect, optimum flocculating condition is defined as：PH is 12 ± 0.02, PAM And MgCl2·6H2O dosages are respectively 0.1~0.5ppm and 0.14~0.24g/L, quickly stir 350rpm/min, stir slowly 1min, maximum goes 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 beakers, adjusts pH to desirable value using HCl and NaOH, add flocculant, quick stirring It is transferred to after (350rpm/min) 1min and stirs (60rpm/min) 1min, standing sedimentation 30min slowly.Supernatant is taken, using trace uranium point Uranium concentration after analyzer measure before processing in water sample.The mud produced after flocculation treatment is transferred in graduated cylinder, a period of time is stood Afterwards, mud volume is recorded, then suction filtration, drying is carried out to mud using vacuum filtration method, is weighed, calculate 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, optimum flocculating condition is finally determined.
1st, auxiliary agent Mg2+Dosage is to going the influence of uranium effect
In order to more preferably investigate auxiliary agent Mg2+PH is set as that 12, PAM throws by dosage to the removal effect of nucleic uranium, this experiment When dosage is respectively 1ppm, 2ppm, 3ppm, using the Mg of different additions2+(other conditions holding is processed uranium-containing waste water Unanimously), as a result as shown in table 1, wherein PAMM represents complex compound organic flocculant of the present invention.
The auxiliary agent Mg of table 12+Dosage goes the influence of uranium effect to PAMM
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 more than 0.14g/L, the PAM of various concentrations is reachable Uranium rate is gone to more than 94%, financial cost and treatment effect is taken into account, by Mg2+Optimum dosage scope be set to 0.14~ 0.24g/L。
2nd, PAM dosages are to going the influence of uranium effect
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 as a result as shown in table 2, wherein PAMM represents this hair Bright complex compound organic flocculant.
PAM dosages go the influence of uranium effect to PAMM under the different molecular weight of table 2
From upper table 2, under the PAM of different molecular weight, the clearance of waste water Radionuclide uranium is with the increasing of PAM input amounts Plus and improve, illustrate add PAM amount it is more, the removal effect of nucleic uranium is better, but addition is more, and cost is also higher, Therefore, from the point of view of financial cost and treatment effect balance is taken into account, the optimal input amount of PAM is set as 0.1 by the present invention~ 0.5ppm。
3rd, pH is to going the influence of uranium effect
As pH=12, add the Mg of 0.14g/L2+When, investigate PAMM pairs that the PAM of different molecular weight is generated under different pH The removal effect (other conditions are consistent) of nucleic uranium, it is as a result as shown in table 3 below.
PH value of solution goes the influence of uranium effect to PAMM under the difference PAM molecular weight of table 3
From the data result of upper table 3, solution ph removes uranium influential effect to the PAMM of different molecular weight PAM complexing generations Difference, on the whole, when pH value of solution is 12, the complex compound PAMM under different molecular weight can reach the excellent uranium that goes and imitate Really, and the pH initial values of waste water of nuclear industry discharge are generally 9~10, it is contemplated that financial cost and treatment effect, by waste water The optimal pH for the treatment of is set to 12.
4th, stirring mode is to going the influence of uranium effect.
This experiment carries out uranium effect and compares to quick mixing speed and the slow time of stirring respectively, as a result respectively such as table 4 below and Shown in table 5.
The quick mixing speed of table 4 is to going the influence of uranium effect
Watch 5 stirs the time to going the influence of uranium effect slowly
By upper table 4 and upper table 5 as can be seen that it is 350rpm/min to work as quick mixing speed, when stirring the time slowly for 1min, core The removal effect of plain uranium is best.
5th, uranium initial concentration goes the influence of uranium effect to PAMM
When pH is 12, PAM and MgCl2·6H2O dosages are respectively 0.1~0.5ppm and 1.6g/L, quick stirring It is 350rpm/min, slow when stirring 1min, investigate the influence that different uranium initial concentrations go uranium effect to PAMM, for example small institute of table 5 of its result Show.
The uranium initial concentration of table 5 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, it is right that organic flocculant of the present invention can reach The clearance of nucleic uranium can reach more than 97%, but when its concentration is more than 1000 μ g/L, due to excessive concentration, the content of uranium is too Many, its clearance is decreased obviously.
Application of the organic flocculant of the present invention of embodiment 2 in radioactivity mud yield is reduced
The optimal flocculating conditions determined using above-described embodiment 1, the i.e. optimal place of radioactive wastewater Radionuclide uranium clearance (pH is 12 ± 0.02, PAM and MgCl to manage bar part2·6H2O dosages are respectively 0.1~0.5ppm and 0.14~0.24g/L, fast Speed stirs 350rpm/min, stirs 1min slowly) Spent Radioactive water sample (initial uranium concentration is 377 μ g/L) is processed, determine this Radioactivity mud volume and sediment weight that invention organic flocculant is produced in flocculation process.Meanwhile, the present embodiment is using existing Inorganic flocculating agent (FeSO4+KMnO4) and single polyacrylamide (PAM) and single Mg (OH)2As a comparison, it is studied The radioactivity mud volume and sediment weight produced in clearance and treatment flocculation process to radioactive wastewater Radionuclide uranium.Its Test result (the M in following table as shown in table 6 belowWRefer to the molecular weight of PAM).
The different flocculants of table 6 are to the result with 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) treatment radioactive wastewater, its Clearance to nucleic uranium can reach more than 94%, and highest can reach 99.18%.Meanwhile, the slurry body produced after treatment In 2~4.5ml, sediment quality is reduced to 0.05g or so for product control, but using inorganic flocculating agent (FeSO4+KMnO4) processed When, although its nucleic uranium clearance can reach 98.18%, but the volume of mud is 20ml after treatment, and sediment quality is 0.1045g；Using single Mg (OH)2Processed, its nucleic uranium clearance can only achieve mud after 89.46%, and treatment Volume be 45ml, and sediment quality be 0.2554；Using single PAM treatment, its nucleic uranium clearance is 41.80%, the volume of mud is 10ml after treatment, and sediment quality is 0.1009g.This organic flocculant of the present invention uses PAM With Mg2+Combined Treatment can not only improve uranium effect, and the yield of radioactivity mud and sediment can be significantly reduced.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (9)

1. it is a kind of remove nucleic uranium organic flocculant, it is characterised in that the organic flocculant is based on polyacrylamide Flocculant, Mg2+It is auxiliary agent, both interact the complex compound of formation, its structural formula is as follows：
。
2. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 1, it is characterised in that the organic-flocculation Agent is applied to the removal of radioactive wastewater Radionuclide uranium.
3. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 1, it is characterised in that the organic-flocculation Agent is applied to reduce the yield of radioactivity mud.
4. a kind of application of the organic flocculant for removing nucleic uranium as described in Claims 2 or 3, it is characterised in that described organic The condition of flocculant application is：Waste liquor PH is 12 ± 0.02, and the dosage of polyacrylamide is 0.1~0.5ppm, Mg2+Add It is 0.14~0.24g/L to measure.
5. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 4, it is characterised in that the organic-flocculation The condition of agent application is：Waste liquor PH is 12, and polyacrylamide dosage is 0.2ppm, Mg2+Dosage be 0.18g/L.
6. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 4, it is characterised in that the organic-flocculation The condition of agent application is：Waste liquor PH is 12, and polyacrylamide dosage is 0.3ppm, Mg2+Dosage be 0.20g/L.
7. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 4, it is characterised in that the organic-flocculation The condition of agent application is：Waste liquor PH is 12, and polyacrylamide dosage is 0.4ppm, Mg2+Dosage be 0.22g/L.
8. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 4, it is characterised in that the organic-flocculation The application conditions of agent also include：Slow stirring 1~5min, last 25~35min of standing sedimentation are transferred to after 1~5min of quick stirring.
9. a kind of application of the organic flocculant for removing nucleic uranium as claimed in claim 8, it is characterised in that the quick stirring Rotating speed be 350rpm/min, the rotating speed of slow stirring is 60rpm/min.
CN201710186376.XA 2017-03-27 2017-03-27 It is a kind of remove nucleic uranium organic flocculant and its application Expired - Fee Related CN106898403B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN109859874A (en) * 2017-11-30 2019-06-07 西南科技大学 A method of uranium-containing waste water is handled using alloy material

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