CN106205760A - A kind of waste water treatment process exempted with slag radioactivity in rare earth extraction waste water - Google Patents
A kind of waste water treatment process exempted with slag radioactivity in rare earth extraction waste water Download PDFInfo
- Publication number
- CN106205760A CN106205760A CN201610669577.0A CN201610669577A CN106205760A CN 106205760 A CN106205760 A CN 106205760A CN 201610669577 A CN201610669577 A CN 201610669577A CN 106205760 A CN106205760 A CN 106205760A
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- China
- Prior art keywords
- waste water
- slag
- rare earth
- radioactivity
- earth extraction
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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
- G21F9/20—Disposal of liquid waste
-
- 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
-
- 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
Abstract
The invention provides in a kind of rare earth extraction waste water and the waste water treatment process of slag radioactivity exemption, mainly include following step: (1) adds the pH to 13 of alkali regulation waste water in rare earth extraction waste water, make radioelement form solid and separate out；(2) water produced in step (1) adds flocculant, stirring, precipitation, make the solid of formation separate with waste water；(3) adding in lime cream in the water produced in step (2) and acid waste water, regulation pH to 7 10 is formed and neutralizes slag, and produced neutralization slag radioactivity is exempted.Radioelement in rare earth extraction waste water of the present invention is removed when pH is for acidity.After remaining in radioelement enrichment, in waste water, radioelement is extremely low, so that the radioactive element content neutralized in slag is little, radioactive level reaches Wave gear pair, can greatly reduce in radioactivity and the processing cost of slag as general solidification disposal of waste.
Description
Technical field
The present invention relates to field of industrial production, particularly relate to controlling of extraction wastewater produced by rare-earth smelting produces
Reason, belongs to environment protection treating field.
Background technology
Rare-earth mineral is generally associated with the natural radionuclide such as uranium (U), thorium (Th), during Rare Earth Production, this
A little radionuclides are often enriched in intermediate products and " three wastes ", so that most of operation of Rare Earth Production all exists radioactivity
Pollute.Radioactive pollution has that harm is disguised strong, lethality is big, hazardness is big and polluter is difficult to features such as destroying,
Radiological hazard is brought to working space and surrounding.
In rare-earth smelting technique, the acid extract waste water that rare earth ore concentrate is formed through sour molten, extraction contains a certain amount of uranium
With thorium element.Extracting bothersome is a kind of strongly acid wastewater, in existing rare earth extraction waste water processes, directly uses the side neutralized
Waste water is adjusted to neutrality by formula, and heavy metal element and radioelement in waste water form precipitation with alkali, obtain substantial amounts of neutralization
Slag.Owing to extraction wastewater is directly by neutralizing, therefore neutralizes in slag containing substantial amounts of radioelement, belong to low and put solid waste,
Its ionizing radiation contained has carcinogenesis and hereditary effect to human body, and causes physiochemical indice abnormal, it is therefore desirable to logical
Crossing special process could safe storage.
At present for containing in radioactive RE waste water and slag, the mode of storehouse storage of typically taking to open a position is disposed, and needs symbol
Close " radwaste safety management regulations ", add great amount of cost to enterprise, bring danger also to the healthy of staff
Evil.At present, the existing treatment technology of neutralization slag that rare-earth smelting factory produces is to build storehouse to keep in, limited in one's ability due to storage vault,
Major part enterprise has occurred in that the phenomenon of " swell-warehouse ", and unable more and more have radioactive neutralization slag bearing.
Summary of the invention
Present invention is higher for existing rare earth extraction waste water radioactive element content, and what waste water treatment process produced contains
In radioactivity and slag generation amount is big, and cannot function as the problem of general fixed-end forces, disclosing a kind of brand-new neutralization slag that makes can
To reach the rare earth extraction waste water treatment process of radioactivity exemption standard.Mainly include following step:
(1) in rare earth extraction waste water, add the pH to 1-3 of alkali regulation waste water, make radioelement form solid and separate out；
(2) water produced in step (1) adds flocculant, stirring, precipitation, make the solid of formation separate with waste water；
(3) water produced in step (2), adds in lime cream and acid waste water, and regulation pH to 7-10 is formed and neutralizes slag, is produced
Raw neutralization slag radioactivity is exempted.
Preferably, in step (1), the pH of regulation waste water is 2.3-2.8.
Preferably, adding flocculant in step (2) is nonionic PAM, dosage 4-8mg/L.
Preferably, in step (3), feeding lime breast is 8-9 to pH.
The process technique disclosing a kind of rare earth extraction waste water of the invention, the invention have the advantages that
(1) radioelement is enriched with removal.The neutralization of rare earth extraction waste water can be divided into two parts, according to radioactivity by the present invention
The pH scope that element forms precipitation from other elements is different, and radioelement just can form precipitation with alkali when pH is acid.Cause
This, the first step first regulates wastewater pH to 1-3, makes the radioelement enrichments such as the thorium in waste water and uranium, by sedimentary
Form remove, its removal effect is good, and the step for formed low waste residue yield of putting little, greatly reduce containing radioactivity solid waste
Generation amount.
(2) radioactivity realizing neutralizing slag is exempted.In the present invention, the radioelement in rare earth extraction waste water is acid at pH
It is removed during property.Therefore, after remaining in radioelement enrichment, in waste water, radioelement is extremely low, so that neutralizing in slag
Radioactive element content is little, and radioactive level reaches Wave gear pair, can greatly reduce in radioactivity as general solidification disposal of waste
Processing cost with slag.
Detailed description of the invention
Below in conjunction with detailed description of the invention, it is further elucidated with the present invention, it should be understood that following detailed description of the invention is only used for
The bright present invention rather than restriction the scope of the present invention.
Embodiment 1
Experiment is carried out in the laboratory of Nanjing Ge Luote environmental project limited company.Experiment rare earth extraction waste water used takes
From certain Rare Earth Enterprises.Adding sodium hydroxide regulation pH to 1 in experiment in waste water, the PAM flocculant adding 4mg/L makes precipitation solid
Body flocculates, and filters and survey the quantity of slag, the thorium in waste water and the content of uranium before and after detection process, the most backward waste water adds lime cream
Regulation pH to 7 forms radioactive level and reaches the neutralization slag of Wave gear pair.
Embodiment 2
Experiment is carried out in the laboratory of Nanjing Ge Luote environmental project limited company.Experiment rare earth extraction waste water used takes
From certain Rare Earth Enterprises.Adding sodium hydroxide regulation pH to 3 in experiment in waste water, the PAM flocculant adding 8mg/L makes precipitation solid
Body flocculates, and filters and survey the quantity of slag, the thorium in waste water and the content of uranium before and after detection process, the most backward waste water adds lime cream
Regulation pH to 10 forms radioactive level and reaches the neutralization slag of Wave gear pair.
Embodiment 3
Experiment is carried out in the laboratory of Nanjing Ge Luote environmental project limited company.Experiment rare earth extraction waste water used takes
From certain Rare Earth Enterprises.Adding sodium hydroxide regulation pH to 2 in experiment in waste water, the PAM flocculant adding 6mg/L makes precipitation solid
Body flocculates, and filters and survey the quantity of slag, the thorium in waste water and the content of uranium before and after detection process, the most backward waste water adds lime cream
Regulation pH to 8 forms radioactive level and reaches the neutralization slag of Wave gear pair.
Embodiment 4
Experiment is carried out in the laboratory of Nanjing Ge Luote environmental project limited company.Experiment rare earth extraction waste water used takes
From certain Rare Earth Enterprises.Adding sodium hydroxide regulation pH to 2.5 in experiment in waste water, the PAM flocculant adding 5mg/L makes precipitation
Solid flocculates, and filters and survey the quantity of slag, the thorium in waste water and the content of uranium before and after detection process, the most backward waste water adds Calx
Breast regulation pH to 9 forms radioactive level and reaches the neutralization slag of Wave gear pair.
Measure and analyze
Experiment equipment: pH analyzer, electronic balance, magnetic stirring apparatus, beaker, filter paper
Testing index: pH, uses pH analyzer to measure；Sediment weight: oven for drying, emperor's balance weigh；Thorium in waste water and uranium
Content: ICP-MS measures；
Use Word Office 2003 software and Excel software that experimental data is analyzed statistics.
The pH of waste water, thorium and uranium concentration before and after experiment, the good dry weight data of sediment are as shown in table 1.
Table 1 experimental result data
| Process | pH | Th(μg/L) | U(μg/L) | The quantity of slag (mg/L) |
| Rare earth extraction waste water | 0.25 | 12.5 | 30.5 | |
| Adding NaOH solution and pH is transferred to 2.5, add PAM, dosage is 6mg/L, filters | 2.5 | 0 | 2.5 | 86.7 |
| Adding NaOH solution and pH is transferred to 4.5, add PAM, dosage is 6mg/L, filters | 4.5 | 0.25 | 1 | 343.3 |
During by table 1 data it can be seen that the pH of waste water is transferred to 2.5 by NaOH solution, the thorium in waste water and the biggest portion of uranium element
Dividing and all precipitate down, heightened further by pH after this, the concentration change of thorium and uranium is little, but owing to waste water containing
Other metal ions also can be precipitated by the form of hydroxide, so pH is sediment weight when 4.5 is that pH is when being 2.5
About 4 times of sediment weight, this part of sediment belongs to low solid waste of putting, and processes cost of disposal higher, so measuring the smaller the better, because of
This, the applicable pH in this technique is about 2.5.
Removing experiment can draw from radioelement, the pH value adding NaOH solution regulation waste water in waste water is permissible
The thorium in waste water and uranium element are removed in success, reduce the radioactivity of waste water, thus can be effective in follow-up neutralisation treatment step
Reduce the radioactivity neutralizing slag.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also includes
The technical scheme being made up of above technical characteristic combination in any.It should be pointed out that, for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (7)
1. the waste water treatment process exempted with slag radioactivity in a rare earth extraction waste water, it is characterised in that mainly include following
Step: (1) adds the pH of alkali regulation waste water in rare earth extraction waste water, makes radioelement form solid and separates out；
(2) water produced in step (1) adds flocculant, stirring, precipitation, make the solid of formation separate with waste water；
(3) adding in lime cream in the water produced in step (2) and acid waste water, regulation pH is formed and neutralizes slag, produced
Neutralize slag radioactivity to exempt.
2. the waste water treatment process exempted with slag radioactivity in rare earth extraction waste water as claimed in claim 1, it is characterised in that
In described step (1), the pH of regulation waste water is 1-3.
3. the waste water treatment process exempted with slag radioactivity in rare earth extraction waste water as claimed in claim 2, it is characterised in that
In described step (1), the pH of regulation waste water is 2.3-2.8.
4. the waste water treatment process exempted with slag radioactivity in rare earth extraction waste water as claimed in claim 1, it is characterised in that
Adding flocculant in described step (2) is nonionic PAM.
5. the waste water treatment process exempted with slag radioactivity in the rare earth extraction waste water as described in claim 1 or 4, its feature exists
In, the dosage 4-8mg/L of flocculant in described step (2).
6. the waste water treatment process exempted with slag radioactivity in rare earth extraction waste water as claimed in claim 1, it is characterised in that
In described step (3), feeding lime breast is 7-10 to pH.
7. the waste water treatment process exempted with slag radioactivity in rare earth extraction waste water as claimed in claim 6, it is characterised in that
In described step (3), feeding lime breast is 8-9 to pH.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610669577.0A CN106205760B (en) | 2016-08-16 | 2016-08-16 | A kind of waste water treatment process exempted in rare earth extraction waste water with slag radioactivity |
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| CN201610669577.0A CN106205760B (en) | 2016-08-16 | 2016-08-16 | A kind of waste water treatment process exempted in rare earth extraction waste water with slag radioactivity |
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| CN106205760A true CN106205760A (en) | 2016-12-07 |
| CN106205760B CN106205760B (en) | 2018-06-19 |
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| US20030234223A1 (en) * | 2002-06-20 | 2003-12-25 | Etsushu Kuraoka | Method of separation and recovery of elements from radioactive liquid wastes |
| JP2007114195A (en) * | 2005-09-26 | 2007-05-10 | National Univ Corp Shizuoka Univ | Extraction separation method |
| CN103288248A (en) * | 2013-07-01 | 2013-09-11 | 全南包钢晶环稀土有限公司 | Combined treatment method for rear earth smelting/separating wastewater |
| CN104835545A (en) * | 2015-03-19 | 2015-08-12 | 西南科技大学 | Method for deeply purifying and recovering hyperhaline fluoric-u radioactive waste solution |
| CN105448373A (en) * | 2015-11-06 | 2016-03-30 | 西南科技大学 | Quick uranium removal and salt reduction method for high-salt uranium-containing waste water or waste liquid |
| CN105967424A (en) * | 2016-06-28 | 2016-09-28 | 中铝广西国盛稀土开发有限公司 | Method for recycling rare earth extraction residual wastewater with high sodium salt content |
-
2016
- 2016-08-16 CN CN201610669577.0A patent/CN106205760B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030234223A1 (en) * | 2002-06-20 | 2003-12-25 | Etsushu Kuraoka | Method of separation and recovery of elements from radioactive liquid wastes |
| JP2007114195A (en) * | 2005-09-26 | 2007-05-10 | National Univ Corp Shizuoka Univ | Extraction separation method |
| CN103288248A (en) * | 2013-07-01 | 2013-09-11 | 全南包钢晶环稀土有限公司 | Combined treatment method for rear earth smelting/separating wastewater |
| CN104835545A (en) * | 2015-03-19 | 2015-08-12 | 西南科技大学 | Method for deeply purifying and recovering hyperhaline fluoric-u radioactive waste solution |
| CN105448373A (en) * | 2015-11-06 | 2016-03-30 | 西南科技大学 | Quick uranium removal and salt reduction method for high-salt uranium-containing waste water or waste liquid |
| CN105967424A (en) * | 2016-06-28 | 2016-09-28 | 中铝广西国盛稀土开发有限公司 | Method for recycling rare earth extraction residual wastewater with high sodium salt content |
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| CN106205760B (en) | 2018-06-19 |
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