CN106508071B - Uranium-bearing, the drip washing of fluorine tail gas and leacheate regeneration technology - Google Patents
Uranium-bearing, the drip washing of fluorine tail gas and leacheate regeneration technologyInfo
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- CN106508071B CN106508071B CN200810075604.7A CN200810075604A CN106508071B CN 106508071 B CN106508071 B CN 106508071B CN 200810075604 A CN200810075604 A CN 200810075604A CN 106508071 B CN106508071 B CN 106508071B
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Abstract
The present invention relates to uranium chemical field uranium-bearing, fluorine tail gas and process for treating waste liquor, and in particular to a kind of uranium-bearing, the drip washing of fluorine tail gas and leacheate regeneration technology, which is carried out as follows successively：(1) K is adopted2CO3Solution drip washing uranium-bearing, fluorine tail gas；(2) sedimentation separation goes out uranyl tricarbonate potassium, if K in gained clear liquid2CO3When mass percent concentration ≈ 0 and KF concentration ＞ 8mol/l, then KOH is added in clear liquid, generate weight potassium uranate precipitation；(3) weight potassium uranate precipitation is filtered to isolate, and gained clear liquid carries out crystallization treatment, and crystal is KF crystal.Present invention process can mitigate impact of the radwaste to environment, with good social benefit；The closed cycle of leacheate then avoids the loss of uranium element, has saved resource, and to fluorine ion-The purpose that recovery has reached " turning waste into wealth " is carried out in the form of KF byproducts, with certain economic benefit.
Description
Technical field
The present invention relates to uranium chemical field uranium-bearing, fluorine tail gas and process for treating waste liquor, and in particular to Yi Zhonghan
Uranium, the elution of fluorine tail gas and leacheate regeneration technology.
Background technology
In green salt into hex conversion process, the process tail gas Main Ingredients and Appearance of generation is big
The nitrogen of amount and harmful excessive fluorine gas, a small amount of hydrogen fluoride gas and a small amount of hexafluoro not condensed in time
Change uranium gas, when handling the process tail gas, sodium carbonate liquor using 5% or so is as leacheate at present,
Purified treatment is carried out to uranium-bearing, fluorine tail gas.After uranium, fluorinion concentration reach setting in leacheate,
Leacheate send liquid waste processing process, with ion exchange adsorption and treatment by extraction, reclaims metallic uranium.Extraction
Yu Shui, absorption tail water remove fluorine ion therein, sulfate ion and micro- through calcium hydroxide neutralisation treatment
The uranium of amount, tail water is discharged after being up to state standards, and waste residue enters slag stock and put.
Existing uranium-bearing, fluorine vent gas treatment and uranium-bearing, fluorine process for treating waste liquor flow chart are as shown in Figure 1.Contain
Uranium, 5%~10%Na of fluorine process tail gas counter current contacting2CO3Solution, wherein pernicious gas are absorbed, most
Throughout one's life into NaF, Na4[UO2(CO3)3] solution.Because NaF solubility is smaller, in actual production
In (convert UF on an hourly basis4Raw material 100kg uranium meter) leacheate run 1~2 day, NaF reaches saturation
Solution, now, this batch of uranium-bearing, fluorine leacheate must send liquid waste processing center, plus running water dilution 5~6
Existing metallic uranium recovery process processing requirement could be met again, is sunk by absorption, extraction, back extraction, neutralization
Waste liquid reached and arranged outside discharging standards that this make it that last waste liquid discharging amount is greatly increased after the processing of shallow lake,
If annual to produce (60~70) ton low-activity solid slag with the production gauge in 1000 tons of uranium/years,
Outer row (5000~6000) m3Low-activity waste liquid.
A large amount of low-activity waste liquids, the generation of waste residue are adversely affected of both directly bringing：1) pollute
Surrounding water source and environment, cause harm to living organism；2) there is uranium resource losing issue, due to uranium ore
Exploitation is difficult, extracts difficulty, and the loss of uranium resource will cause certain economic loss.
The content of the invention
Present invention aims at providing one kind to realize radioactive liquid waste closed cycle, Spent Radioactive is reached
Liquid, waste residue (CaF2Waste residue) zero-emission uranium-bearing, fluorine tail gas elution and leacheate regeneration technology.
A kind of uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology, it is as follows
Carry out successively：
(1) K is used2CO3Solution elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percent concentration is
5~10%, generate uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 5~10%, continues on for step
(1) elution uranium-bearing, fluorine tail gas in；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 3~5 times that mole is uranium ion mole in clear liquid, to enter one
Step precipitation uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid carries out crystallization treatment, and the crystal is KF crystal, and crystallization is mother liquid obtained to add K2CO3, make mother
K in liquid2CO3Mass percent concentration is 5~10%, continues on for elution uranium-bearing, fluorine in step (1)
Tail gas.
A kind of uranium-bearing as described above, the elution of fluorine tail gas and leacheate regeneration technology, it is in step (1)
Through K2CO3Uranium-bearing, fluorine tail gas after solution elution use K again2CO3Solution is eluted, K2CO3Solution
Mass percent concentration is 5~10%；If K in resulting solution2CO3Mass percent concentration ≈ 0 and KF
During concentration≤3mol/l, then K is added into solution2CO3, make K in solution2CO3Solution quality percentage
Concentration is 5~10%, continues on for elution through K2CO3Uranium-bearing, fluorine tail gas after solution elution；If gained
K in solution2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 3mol/l, then add into leacheate
K2CO3, make K in leacheate2CO3Solution quality percent concentration is 5~10%, is subsequently used for step (1)
Middle elution uranium-bearing, fluorine tail gas.
Institute in a kind of uranium-bearing as described above, the elution of fluorine tail gas and leacheate regeneration technology, its step (3)
That states carries out crystallization treatment to gained clear liquid, is the method for crystallising being concentrated in vacuo using heating evaporation.
Institute in a kind of uranium-bearing as described above, the elution of fluorine tail gas and leacheate regeneration technology, its step (3)
That states carries out crystallization treatment to gained clear liquid, is in 65~70 DEG C, pressure -0.082MPa~-0.084MPa
To solution carry out vacuum evaporation, be allowed to be changed into KF supersaturated solutions, be then cooled to again 20 DEG C~
30 DEG C of crystallizations, isolated KF crystal.
A kind of uranium-bearing as described above, the elution of fluorine tail gas and leacheate regeneration technology, it is to isolated
KF crystal is recrystallized, further to reduce wherein impurity content, the mother liquor crystallization that crystallization process is produced
It is mother liquid obtained to add K2CO3, make K2CO3Solution quality percent concentration is 5~10%, continues on for drenching
Wash uranium-bearing, fluorine tail gas.
A kind of uranium-bearing as described above, the elution of fluorine tail gas and leacheate regeneration technology, described in it to separation
Obtained KF crystal is recrystallized, and is in 65~70 DEG C, pressure -0.082MPa~-0.084MPa
To solution carry out vacuum evaporation, be allowed to be changed into KF supersaturated solutions, be then cooled to again 20 DEG C~
30 DEG C of crystallizations, isolated KF crystal.
Effect of the invention is that：Uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology,
Influence of the radwaste to environment can be mitigated, with good social benefit；The closed circuit of leacheate follows
Ring then avoids the loss of uranium element, has saved resource, and to fluorine ion-In the form of KF byproducts
The purpose that recovery has reached " turning waste into wealth " is carried out, with certain economic benefit.In addition, of the invention
Technique is on the leading domestic level, and can be large-scale production hex engineering project in uranium chemical field
Vent gas treatment provides design considerations, and the processing simultaneously for other fluorine chemical industry waste gas containing fluorides, waste liquid is carried
A kind of brand-new technology is supplied, with promotional value.
Brief description of the drawings
Fig. 1 is existing uranium-bearing, fluorine vent gas treatment and uranium-bearing, fluorine process for treating waste liquor schematic flow sheet；
Fig. 2 is uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology schematic flow sheet.
Embodiment
With reference to specific embodiment and accompanying drawing to uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate
Regeneration technology is further described.
Embodiment 1
Uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology, it is as follows successively
Carry out：
(1) K is used2CO3Solution one-level elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percentage is dense
Spend for 8%, generation uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 8%, continues on for step (1)
Middle elution uranium-bearing, fluorine tail gas；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 4 times that mole is uranium ion mole in clear liquid, further to sink
Shallow lake uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid carries out vacuum evaporation under 68 DEG C, -0.083MPa, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 25 DEG C of crystallizations, isolated KF crystal again.Isolated KF crystal is carried out
Recrystallization, carries out vacuum evaporation under 68 DEG C, -0.083MPa, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 25 DEG C of crystallizations again, and further to reduce wherein impurity content, isolated KF is brilliant
Body.Crystallization is mother liquid obtained to add K2CO3, make K in mother liquor2CO3Mass percent concentration is 8%, is continued
For eluting uranium-bearing, fluorine tail gas.
(4) in step (1) through K2CO3Uranium-bearing, fluorine tail gas after solution elution use K again2CO3
Solution two-step washing, K2CO3Solution quality percent concentration is 8%；If K in resulting solution2CO3Quality
Percent concentration ≈ 0 and during KF concentration≤3mol/l, then add K into solution2CO3, make in solution
K2CO3Solution quality percent concentration is 8%, continues on for two-step washing, that is, elutes through K2CO3Solution
Uranium-bearing, fluorine tail gas after elution；If K in resulting solution2CO3Mass percent concentration ≈ 0 and KF concentration
During ＞ 3mol/l, then K is added into leacheate2CO3, make K in leacheate2CO3Solution quality percentage is dense
Spend for 8%, be subsequently used for one-level elution uranium-bearing, fluorine tail gas in step (1).
One is entered to uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology with reference to Fig. 2
Step description：
(1) rinsing step：Using certain density K2CO3Solution elution uranium-bearing, fluorine tail gas, generation three
Uranyl carbonate potassium and potassium fluoride, its reaction equation are as follows：
UF6+H2O=UO2F2+4HF
F2+H2O=2HF+O2
HF+K2CO3=KHCO3+KF
KHCO3+ HF=KF+H2O+CO2
3K2CO3+UO2F2=K4[UO2(CO3)3]+2KF
Leacheate uses K2CO3Solution, uses K2CO3Solution substitutes Na2CO3Solution as leacheate,
Uranium-bearing, the elution of fluorine process tail gas are carried out to absorb pernicious gas therein, due to K2CO3It is (anti-with KF
Answer product) high-dissolvability so that the continuous use time of leacheate extends to 12~15 days (same volumes
Na2CO3The continuous use time of solution is 1~2 day), uranium-bearing, the yield of fluorine waste liquid are reduced, and
And, the extension of leacheate run time can further improve the KF concentration in solution, be that postorder is reclaimed
KF creates advantage.
(2) uranium recycling step：With the continuous progress of reaction, uranium in leacheate, KF content it is more next
It is higher, when KF concentration increases to certain value, K4[UO2(CO3)3] solubility reduction, decline
Separate out；If KF contents are not up to crystallization and required in clear liquid, K is added2CO3To during setting return after
Continuous elution is used；If in clear liquid KF contents reach crystallization require, plus KOH further precipitate uranium salt it
After send to and do crystallization treatment to reclaim KF, mother liquor adds K after returning2CO3It is continuing with, KOH removes uranium
The reaction equation that process occurs is as follows：
KHCO3+ KOH=K2CO3+H2O
2K4[UO2(CO3)3]+6KOH=K2U2O7↓+6K2CO3+3H2O
Add KOH into leacheate, occur precipitation reaction and be recovered by filtration after uranium to make in leacheate
Uranium content is down to milligram level, and this not only realizes the recovery of most of uranium salt in leacheate, and is postorder
KF byproducts radiation specific activity be up to state standards (100Bq/kg) create condition.
(3) fluorine removal step：Mother liquor after further reclaiming uranium through potassium hydroxide, using heating evaporation vacuum
The method of concentration, is allowed to be changed into KF supersaturated solutions, then decrease temperature crystalline realizes KF in the form of byproduct
Recovery, the mother liquor that steam condensate (SC) and crystallization process are produced returns to front end process and adds K2CO3After continue
Use, finally realize the zero-emission of radioactive liquid waste, waste residue.Potassium fluoride crystal recrystallization reaches technical grade
Standard.
As shown in Fig. 2 K can be used2CO3Solution carries out two-stage as leacheate to uranium-bearing, fluorine tail gas
Elution, is that maximum possible is realized further to reduce the content of pernicious gas in process tail gas final mesh
The recovery of uranium, fluorine element in leacheate.There is very high absorption efficiency as the spray column of one-level eluting column
And smoothness, system can be occurred without up to more than 95% to the uranium-bearing in process tail gas, fluorine gas absorptivity
Stopping state；In uranium-bearing, the absorption process of fluorine tail gas, the packed tower as two-step washing tower is then most
Check on eventually equipment so that the gas after one-level elution is fully contacted with alkali lye, further absorption is wherein
Harmful substance.
The economic benefit of present invention process is obvious：(1) the uranium inversion quantity using 1000 tons of uranium/years is former as radix
There is the process metal uranium rate of recovery about 85%, lose about 15%, which part metallic uranium is carried on CaF2Waste residue
In, another part metallic uranium is lost in (U≤50 μ g/l, F with standard discharge waste water-≤200mg/l)；Using
After present invention process, the primary recovery of uranium is up to more than 90%, and remaining 10% is still in mother liquor, female
It is 6.15kg that liquid, which recycles and can reduce metallic uranium loss,.(2) in original technique, the big portion in leacheate
Divide F-With CaF2The form of waste residue (62 tons) enters slag stock and put, a small amount of F-Arranged outside qualified waste water with being handled
(F-≤200mg/l)；Present invention process is due to realizing the closed cycle of leacheate, F-With KF crude products
Form is recycled, and can produce 45 tons of KF crude products, and meets in the purified processing of the product enter after GB
Market is used as production KHF2The raw material of (electrolysis fluorine processed).In addition, present invention process realizes leacheate
Recycling, realize the zero-emission of radioactive liquid waste, waste residue, alleviate radwaste to environment
Influence.
Embodiment 2
Uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology, it is as follows successively
Carry out：
(1) K is used2CO3Solution elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percent concentration is
5%, generate uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 5%, continues on for step (1)
Middle elution uranium-bearing, fluorine tail gas；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 3 times that mole is uranium ion mole in clear liquid, further to sink
Shallow lake uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid carries out vacuum evaporation under 65 DEG C, -0.082MPa, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 20 DEG C of crystallizations, isolated KF crystal again.Crystallization is mother liquid obtained to add K2CO3,
Make K in mother liquor2CO3Mass percent concentration is 5%, continues on for elution uranium-bearing, fluorine tail gas.
(4) in step (1) through K2CO3Uranium-bearing, fluorine tail gas after solution elution use K again2CO3
Solution is eluted, K2CO3Solution quality percent concentration is 5%；If K in resulting solution2CO3Quality percentage
Specific concentration ≈ 0 and during KF concentration≤3mol/l, then add K into solution2CO3, make K in solution2CO3
Solution quality percent concentration is 5%, continues on for elution through K2CO3Uranium-bearing, fluorine tail after solution elution
Gas；If K in resulting solution2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 3mol/l, then to pouring
K is added in washing lotion2CO3, make K in leacheate2CO3Solution quality percent concentration is 5%, is subsequently used for
Elution uranium-bearing, fluorine tail gas in step (1).
Embodiment 3
Uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology, it is as follows successively
Carry out：
(1) K is used2CO3Solution elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percent concentration is
10%, generate uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 10%, continues on for step (1)
Middle elution uranium-bearing, fluorine tail gas；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 5 times that mole is uranium ion mole in clear liquid, further to sink
Shallow lake uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid carries out vacuum evaporation under 70 DEG C, -0.084MPa, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 30 DEG C of crystallizations, isolated KF crystal again.Isolated KF crystal is carried out
Recrystallization, carries out vacuum evaporation under 70 DEG C, -0.084MPa, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 30 DEG C of crystallizations again, and further to reduce wherein impurity content, isolated KF is brilliant
Body.Crystallization is mother liquid obtained to add K2CO3, make K in mother liquor2CO3Mass percent concentration is 10%, after
Continue for eluting uranium-bearing, fluorine tail gas.
Embodiment 4
Uranium-bearing of the present invention, the elution of fluorine tail gas and leacheate regeneration technology, it is as follows successively
Carry out：
(1) K is used2CO3Solution elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percent concentration is
7%, generate uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 7%, continues on for step (1)
Middle elution uranium-bearing, fluorine tail gas；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 5 times that mole is uranium ion mole in clear liquid, further to sink
Shallow lake uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid is crystallized, isolated KF crystal.Isolated KF crystal is recrystallized, to enter
The reduction of one step wherein impurity content, isolated KF crystal.Crystallization is mother liquid obtained to add K2CO3, make mother
K in liquid2CO3Mass percent concentration is 7%, continues on for elution uranium-bearing, fluorine tail gas.
Claims (6)
1. a kind of uranium-bearing, fluorine tail gas are eluted and leacheate regeneration technology, it is carried out successively as follows：
(1) K is used2CO3Solution elution uranium-bearing, fluorine tail gas, K2CO3Solution quality percent concentration is
5~10%, generate uranyl tricarbonate potassium and potassium fluoride；
(2) with KF concentration increase in solution, the solubility of the uranyl tricarbonate potassium of generation is reduced and portion
Analyze, sedimentation separation goes out uranyl tricarbonate potassium；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration≤8mol/l, then to clear
K is added in liquid2CO3, make K in clear liquid2CO3Mass percent concentration is 5~10%, continues on for step
(1) elution uranium-bearing, fluorine tail gas in；
If K in gained clear liquid2CO3Mass percent concentration ≈ 0 and during KF concentration ＞ 8mol/l, then to clear
KOH is added in liquid, KOH adds 3~5 times that mole is uranium ion mole in clear liquid, to enter one
Step precipitation uranium salt, generation weight potassium uranate precipitation；
(3) resulting solution after KOH is added to step (2) to filter, isolate weight potassium uranate precipitation,
Gained clear liquid carries out crystallization treatment, and the crystal is KF crystal, and crystallization is mother liquid obtained to add K2CO3, make mother
K in liquid2CO3Mass percent concentration is 5~10%, continues on for elution uranium-bearing, fluorine in step (1)
Tail gas.
2. a kind of uranium-bearing according to claim 1, fluorine tail gas are eluted and leacheate regeneration technology, its
It is characterised by：To in step (1) through K2CO3Uranium-bearing, fluorine tail gas after solution elution use K again2CO3
Solution is eluted, K2CO3Solution quality percent concentration is 5~10%；If K in resulting solution2CO3Quality
Percent concentration ≈ 0 and during KF concentration≤3mol/l, then add K into solution2CO3, make in solution
K2CO3Solution quality percent concentration is 5~10%, continues on for elution through K2CO3After solution elution
Uranium-bearing, fluorine tail gas；If K in resulting solution2CO3Mass percent concentration ≈ 0 and KF concentration ＞ 3mol/l
When, then K is added into leacheate2CO3, make K in leacheate2CO3Solution quality percent concentration be 5~
10%, it is subsequently used for elution uranium-bearing, fluorine tail gas in step (1).
3. a kind of uranium-bearing according to claim 1, fluorine tail gas are eluted and leacheate regeneration technology, its
It is characterised by：Crystallization treatment is carried out to gained clear liquid described in step (3), is true using heating evaporation
The method for crystallising of sky concentration.
4. a kind of uranium-bearing according to claim 3, fluorine tail gas are eluted and leacheate regeneration technology, its
It is characterised by：Crystallization treatment is carried out to gained clear liquid described in step (3), is in 65~70 DEG C, pressure
Power -0.082MPa~-0.084MPa carries out vacuum evaporation to solution, is allowed to be changed into KF supersaturation
Solution, is then cooled to 20 DEG C~30 DEG C crystallizations, isolated KF crystal again.
5. a kind of uranium-bearing, the elution of fluorine tail gas and leacheate regeneration according to claim 1 or 3 or 4
Technique, it is characterised in that：Isolated KF crystal is recrystallized, further to reduce wherein miscellaneous
Matter content, K is added to the mother liquor that crystallization process is produced2CO3, make K2CO3Solution quality percent concentration
For 5~10%, continue on for elution uranium-bearing, fluorine tail gas.
6. a kind of uranium-bearing according to claim 5, fluorine tail gas are eluted and leacheate regeneration technology, its
It is characterised by：Described recrystallizes to isolated KF crystal, is in 65~70 DEG C, pressure
- 0.082MPa~-0.084MPa carries out vacuum evaporation to solution, is allowed to be changed into KF supersaturation molten
Liquid, is then cooled to 20 DEG C~30 DEG C crystallizations, isolated KF crystal again.
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| CN106582198B (en) * | 2016-12-28 | 2019-05-17 | 中核四0四有限公司 | A kind of purified treatment flaorination process exhaust system |
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| CN112759110A (en) * | 2020-11-26 | 2021-05-07 | 中核二七二铀业有限责任公司 | Circulation method of uranium-containing fluorine-containing wastewater |
| CN114642956A (en) * | 2020-12-18 | 2022-06-21 | 中核四0四有限公司 | Circulating leaching method for potassium carbonate solution of tail gas of fluorination process |
| CN114853208A (en) * | 2022-04-27 | 2022-08-05 | 中陕核工业集团综合分析测试有限公司 | Method for harmless treatment and resource utilization of associated mine radioactive acidic wastewater |
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