CN110184458A - It is a kind of to handle the technique containing uranium solution using Chemical adsorptive fiber - Google Patents
It is a kind of to handle the technique containing uranium solution using Chemical adsorptive fiber Download PDFInfo
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- CN110184458A CN110184458A CN201910411146.8A CN201910411146A CN110184458A CN 110184458 A CN110184458 A CN 110184458A CN 201910411146 A CN201910411146 A CN 201910411146A CN 110184458 A CN110184458 A CN 110184458A
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- uranium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
- C22B60/02—Obtaining thorium, uranium, or other actinides
- C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
- C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
- C22B60/0252—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes treatment or purification of solutions or of liquors or of slurries
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- Environmental & Geological Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The invention belongs to uranium technical field of wet metallurgy, and in particular to a kind of to handle the technique containing uranium solution using Chemical adsorptive fiber.The following steps are included: using Chemical adsorptive fiber, using vinal as matrix；Adsorbent uses column construction method, and Chemical adsorptive fiber is accumulated using ball filler formula, forms adsorbent bed, forms fixed bed under certain pressure and adsorption flow rate；It is pumped into from bed one end containing uranium solution using flow pump according to predetermined flow rate, after Chemical adsorptive fiber bed adsorption, flows out tail washings from the other end；When tail washings uranium concentration reaches predetermined concentration, stopping is pumped into uranium solution, terminates absorption；It is passed through strippant in the same direction with absorption, piecewise acquisition is carried out to efflux；When efflux uranium concentration is lower than predetermined concentration, end desorption；The above adsorption-desorption cycle is repeated, realizes uranium enrichment and recycling.Application of the Chemical adsorptive fiber in recycling metallic uranium may be implemented in the present invention, improves the exchange rate of uranium, shortens the return period of uranium in solution.
Description
Technical field
The invention belongs to uranium technical field of wet metallurgy, and in particular to a kind of to contain uranium solution using Chemical adsorptive fiber processing
Technique.
Background technique
Uranium Mining smelting process is common mainly to be generated there are several types of: uranium ore routine dump leaching and leaching containing uranium solution
Leachate, for uranium concentration generally between 100mg/L~2g/L, component is more complicated, and concentration impurity ion is high.The leaching of uranium ore acid in-situ leaching
Liquid uranium concentration is generally in 10-300mg/L out, and since initial acid is lower, leachate spent acid is lower, and concentration impurity ion is opposite
It is lower.CO2+O2In-situ leaching process leachate uranium concentration is generally in 10-300mg/L, and solution composition is simple, and flow is big.
It is common to be echoed in two kinds of techniques realization recycling solution of extraction using ion-exchange absorption in the hydrometallurgy of domestic and international uranium
Uranium.Use cardinal principle of the ion-exchange processing containing uranium solution for uranyl ion is through diffusion process, with ion exchange resin
On group occur ion-exchange reactions, to realize the absorption and desorption of uranium.But expansion of the uranyl ion in resin particle
Scattered speed is slower, so, leachate and ion exchange resin must keep enough times of contact.Meanwhile to guarantee to adsorb tail
Liquid U concentration is lower than preassigned, there are certain requirements to resin bed exchange height.
Chemical adsorptive fiber (lower to be referred to as " fiber ") is a kind of novel absorption material, and diameter is 10~30 μm, with chemistry
Synthetic fibers are reacted by function base modified chemical and are prepared as matrix.Such as patent No. CN1608733, by natural fiber or
Chemical fibre is the anion-exchange fibre of raw fibre grafting preparation, and exchange capacity reaches 2.7-5.7mmol/g.Since it compares table
Area is big, and Adsorption and desorption speed is fast, can apply in a variety of forms.Currently, being mainly used in electrodialysis, heavy metal ion is extracted
The fields such as softening desalination of purification and water and.Such as patent No. CN107282020A, it is reacted using fiber with phosphorus-containing compound
The ion-exchange fibre being prepared further is reacted based on obtained phosphatide chemical fibre dimension, for the purpose of the extraction of uranium from seawater, to uranium
Adsorptive selectivity is good, repeats to elute adsorbance up to 85.6%.Patent No. CN104628087A utilizes strong basic ion exchange fiber
As adsorbing medium, pentavalent vanadium ion and hexavalent chromium in waste water are handled.
Compared with extracting the technique of metal with resin in conventional ion exchange industry, Chemical adsorptive fiber has following excellent
Gesture:
1) exchange velocity is fast, is much higher than similar resin；
2) application mode diversification, can be made into various assemblies form；
3) functional group is present in surface, and reproduction speed is fast, and regeneration rate is high, effective exchange capacity of fiber in use process
It is lost low.
In conclusion Chemical adsorptive fiber in uranium hydrometallurgical processes, has very big application potential.
Summary of the invention
The technique containing uranium solution is handled using Chemical adsorptive fiber the purpose of the present invention is to provide a kind of, realizes that chemistry is inhaled
Application of the attached fiber in recycling metallic uranium；Fast using its exchange velocity, the fast feature of reproduction speed improves the exchange speed of uranium
Rate shortens the return period of uranium in solution, is conducive to high flow rate light concentration containing uranium solution processing；Realize that the trundle bed of uranium in solution is handed over
It changes.
In order to achieve the above objectives, the technical solution used in the present invention are as follows:
It is a kind of to handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: the following steps are included:
1) Chemical adsorptive fiber is used, using vinal as matrix；
2) adsorbent uses column construction method, and Chemical adsorptive fiber is accumulated using ball filler formula, formation adsorbent bed, and one
Fixed bed is formed under constant-pressure and adsorption flow rate；
3) it is pumped into from bed one end containing uranium solution using flow pump according to predetermined flow rate, through Chemical adsorptive fiber bed adsorption
Afterwards, tail washings is flowed out from the other end；
4) when tail washings uranium concentration reaches predetermined concentration, stopping is pumped into uranium solution, terminates absorption；
5) it is passed through strippant in the same direction with absorption, piecewise acquisition is carried out to efflux；
6) when efflux uranium concentration is lower than predetermined concentration, end desorption；
7) the above adsorption-desorption cycle is repeated, realizes uranium enrichment and recycling.
The Chemical adsorptive fiber used in the step 1) is strongly basic anion ion exchange fibre.
Absorption time of contact is 5-20s in the step 3).
Desorption time of contact is 30s in the step 5).
Adsorbent uses column construction method in the step 2), i.e., Chemical adsorptive fiber is fitted into glass column.
Strippant is NaCl+0.2mol/L Na in the step 5)2CO3。
It is obtained by the present invention to have the beneficial effect that
1) fast exchange, treating capacity are big
For general uranium ore leachate, resin adsorption time of contact generally requires 5-20min, and Chemical adsorptive fiber contacts
Time only needs 5-10s, although desorption time of contact slightly larger than absorption, desorbs since adsorption process solution treating capacity is much larger than
Process treating capacity, therefore fiber exchange cycle depends primarily on absorption time of contact.Therefore, compared with equal amount resin, fiber is inhaled
Attached capacity is about resin 2/3rds.Fibers adsorption speed is fast, and the absorption-desorption period is short, can quickly have enough to meet the need.It is especially suitable for
Largely handled containing uranium solution.
2) swapace trundle bed
General resins exchange cell height is about 80cm, and Chemical adsorptive fiber exchange height only needs 30cm.For not
Swapped with concentration uranium solution, calculate adsorbent needed for same yield bed volume, fiber is approximately the 1/10-1/ of resin
16；
3) capacity loss is low
Through 10 times or more adsorption-desorption cycles, fiber capacity can reach former 85% or more capacity, substantially meet Uranium Mining smelting
It is required that.
Detailed description of the invention
Fig. 1 is to handle the process flow chart containing uranium solution using Chemical adsorptive fiber.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, it is of the present invention using Chemical adsorptive fiber handle the technique containing uranium solution the following steps are included:
1) use Chemical adsorptive fiber for strongly basic anion ion exchange fibre, using vinal as matrix.
2) adsorbent uses column construction method, and Chemical adsorptive fiber is accumulated using ball filler formula, formation adsorbent bed, and one
Fixed bed is formed under constant-pressure and adsorption flow rate.
3) it is pumped into from bed one end containing uranium solution using flow pump according to predetermined flow rate, through Chemical adsorptive fiber bed adsorption
Afterwards, tail washings is flowed out from the other end.Based on time of contact, absorption time of contact is 5-20s.
4) when tail washings uranium concentration reaches predetermined concentration, stopping is pumped into uranium solution, terminates absorption.
5) it is passed through strippant in the same direction with absorption, piecewise acquisition is carried out to efflux, desorbs time of contact 30s.
6) when efflux uranium concentration is lower than predetermined concentration, end desorption.
7) the above adsorption-desorption cycle is repeated, realizes uranium enrichment and recycling.
Embodiment 1
Using Inner Mongol CO2+O2It soaks to extract technology uranium mine leachate and carries out recycling enrichment, the specific steps are as follows:
Anion Chemical adsorptive fiber is fitted into the glass column that diameter is 18.5mm, Chemical adsorptive fiber bed by step 1
Layer height is 450mm, and bed height and diameter ratio are 24.3；Anion Chemical adsorptive fiber is using vinal as base
Body, fiber number 22.0D, exchange capacity 3.25mmolg-1；
Step 2, uranium-bearing solution chemistry group become uranium concentration 32mg/L, pH value 7.0, Cl-Concentration is 460mg/L；By upper
Portion enters in glass column, and by Chemical adsorptive fiber, the solution after absorption is flowed out by lower part；Feed speed is 16 bed volumes/small
When, until efflux uranium concentration reaches 31.8mg/L, absorption terminates, and obtains saturation Chemical adsorptive fiber, and adsorption capacity is
70.0mgU/g dry fibers；
Step 3 desorbs saturation Chemical adsorptive fiber using strippant, and strippant group becomes 1.0mol/L NaCl+
0.15mol/L Na2CO3, residence time 300s, when stripping liquid uranium concentration is less than 500mg/L, desorption terminates, and obtains uranium-bearing conjunction
Lattice liquid, qualifying liquid are averaged uranium concentration as 22.5g/L.
Embodiment 2
Enriching and recovering is carried out using the conventional uranium mine acid heap leaching leachate in Guangdong, leachate composition is as follows:
| Composition | U | ∑Fe | Fe2+ | SO4 2- | pH | Eh |
| ρ/(g·L-1) | 0.402 | 4.33 | 0.25 | 40.7 | 1.27 | 399 |
Specific step is as follows:
Anion Chemical adsorptive fiber is fitted into the glass column that diameter is 30mm, Chemical adsorptive fiber bed by step 1
Height is 900mm, and bed height and diameter ratio are 30；Anion Chemical adsorptive fiber is fine using vinal as matrix
Degree is 28.0D, exchange capacity 2.70mmolg-1；
Step 2 is entered in glass column containing uranium solution by top, and by Chemical adsorptive fiber, the solution after absorption is by lower part
Outflow, feed speed are 24 bed volumes/hour；Until efflux uranium concentration reaches 48.2mg/L, absorption terminates, and obtains saturation
Adsorbing fiber is learned, adsorption capacity is 86.2mgU/g dry fibers；
Step 3 desorbs saturation Chemical adsorptive fiber using strippant, and strippant group becomes 1.5mol/L NaCl+
0.2mol/L Na2CO3, residence time 360s；When stripping liquid uranium concentration is less than 500mg/L, desorption terminates, and obtains uranium-bearing qualification
Liquid, qualifying liquid are averaged uranium concentration as 28.7g/L.
Embodiment 3
It using certain acid technological process soaks uranium deposit leachate and carries out enriching and recovering, the specific steps are as follows:
Anion Chemical adsorptive fiber is fitted into the glass column that diameter is 30mm, Chemical adsorptive fiber bed by step 1
Height is 900mm, and bed height and diameter ratio are 30；Anion Chemical adsorptive fiber is fine using vinal as matrix
Degree is 28.0D, exchange capacity 2.70mmolg-1；
Step 2, uranium solution chemical composition are uranium concentration 18mg/L, pH value 2.0；Glass is entered by top containing uranium solution
In column, by Chemical adsorptive fiber, the solution after absorption is flowed out by lower part, and feed speed is 24 bed volumes/hour；Until outflow
Liquid uranium concentration reaches 1.0mg/L, and absorption terminates, and obtains saturation Chemical adsorptive fiber, and adsorption capacity is 31.5mgU/g dry fibers；
Step 3 desorbs saturation Chemical adsorptive fiber using strippant, and strippant group becomes 1.5mol/L NaCl+
0.2mol/L Na2CO3, residence time 360s；When stripping liquid uranium concentration is less than 200mg/L, desorption terminates, and obtains uranium-bearing qualification
Liquid, qualifying liquid are averaged uranium concentration as 18.3g/L.
Claims (6)
1. a kind of handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: the following steps are included:
1) Chemical adsorptive fiber is used, using vinal as matrix；
2) adsorbent uses column construction method, and Chemical adsorptive fiber is accumulated using ball filler formula, forms adsorbent bed, a level pressure
Fixed bed is formed under power and adsorption flow rate；
3) it is pumped into from bed one end containing uranium solution using flow pump according to predetermined flow rate, after Chemical adsorptive fiber bed adsorption,
Tail washings is flowed out from the other end；
4) when tail washings uranium concentration reaches predetermined concentration, stopping is pumped into uranium solution, terminates absorption；
5) it is passed through strippant in the same direction with absorption, piecewise acquisition is carried out to efflux；
6) when efflux uranium concentration is lower than predetermined concentration, end desorption；
7) the above adsorption-desorption cycle is repeated, realizes uranium enrichment and recycling.
2. according to claim 1 handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: described
The Chemical adsorptive fiber used in step 1) is strongly basic anion ion exchange fibre.
3. according to claim 1 handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: described
Absorption time of contact is 5-20s in step 3).
4. according to claim 1 handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: described
Desorption time of contact is 30s in step 5).
5. according to claim 1 handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: described
Adsorbent uses column construction method in step 2), i.e., Chemical adsorptive fiber is fitted into glass column.
6. according to claim 1 handle the technique containing uranium solution using Chemical adsorptive fiber, it is characterised in that: described
Strippant is NaCl+0.2mol/L Na in step 5)2CO3。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549243A (en) * | 2020-04-24 | 2020-08-18 | 核工业北京化工冶金研究院 | Method for adsorbing uranium by adopting chemical adsorption fibers |
| CN114505060A (en) * | 2020-11-17 | 2022-05-17 | 核工业北京化工冶金研究院 | Composite adsorbent and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549243A (en) * | 2020-04-24 | 2020-08-18 | 核工业北京化工冶金研究院 | Method for adsorbing uranium by adopting chemical adsorption fibers |
| CN114505060A (en) * | 2020-11-17 | 2022-05-17 | 核工业北京化工冶金研究院 | Composite adsorbent and preparation method and application thereof |
| CN114505060B (en) * | 2020-11-17 | 2024-03-22 | 核工业北京化工冶金研究院 | Composite adsorbent and preparation method and application thereof |
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