CN109736770A - A kind of ground-dipping uranium extraction can back-flushing filtering system and method - Google Patents
A kind of ground-dipping uranium extraction can back-flushing filtering system and method Download PDFInfo
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- CN109736770A CN109736770A CN201811604195.5A CN201811604195A CN109736770A CN 109736770 A CN109736770 A CN 109736770A CN 201811604195 A CN201811604195 A CN 201811604195A CN 109736770 A CN109736770 A CN 109736770A
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Abstract
The present invention relates to a kind of ground-dipping uranium extraction can back-flushing filtering system and method, the system, including filter device, static mixer, gas bag, lower reservoir container, pressure maintaining valve, non-return valve, gas flowmeter, electromagnetic flowmeter and flow control valve；The method, comprising the following steps: Step 1: carrying out liquor analysis；Step 2: normal filtration；Step 3: backwash operation.The present invention determines that filter core filters diameter by leachate analysis, utmostly guarantees filtering accuracy；It carries out backwashing to avoid wasting using uranium metal caused by stoste using lower fluid injection is leached, and is effectively utilized the pressure of lower fluid injection in system, does not have to individually plus pumps；Using SV static mixer, good mixing effect, recoil is thorough, speed is fast；It is responsible for air inlet by mixer, gas-liquid mixed back flushing filter core is carried out with large scale gas liquid ratio, considerably reduces recoil water.This system and technique achieve good filtering, repercussion effect in ground leaching practice, and system is easy to automate.
Description
Technical field
The invention belongs to in-situ leaching uranium fields, and in particular to a kind of ground-dipping uranium extraction can back-flushing filtering system and side
Method.
Background technique
Ground-dipping uranium extraction is by continuously taking out, leachate is extracted out from underground, and infuses leaching agent again after absorption by fluid injection
Enter underground.Due to fluid dynamic and chemical action, lead to the solids for having certain in leachate.In order to guarantee that resin bed does not pollute
And underground ore bed hole is not blocked, need leachate into before resin tower and before leaching agent injection is underground ore bed by liquid mistake
Filter.
Ground-dipping uranium extraction is all filtered using bag filter at present.Bag filter structure is simple, small investment, Ke Yibao
Demonstrate,prove suitable filtering accuracy.But bag filter pollutant holding capability is small, replacement filter bag is cumbersome, time length, large labor intensity.
Many factories and miness can only increase the filter opening of filter bag in the case where not can guarantee replacement filter bag in time, can make straight less than filter opening
The particle of diameter enter resin bed perhaps ore bed cause the hardened perhaps jamming of ore bed of resin bed cause adsorption tower tower pressure increase or
The decline of pumping liquid measure.
Backwash filter does not have to disassembly, reduces labor intensity, and pollutant holding capability is big, and using effect is preferable.Conventional is anti-
Flush filter is filtered using thick, thin two kinds of strainers, and carries out filter-core back-flushing using filtering water purification.To guarantee cleaning effect
Fruit improves cleaning action frequently with modes such as suction nozzle, brushes.But the solia particle of In Pregnant Solution From In-situ Leaching mainly flocculates
Iron, calcium and magnesium sediment, clay etc., these solid impurity object partial sizes are generally less than 10 μm, earth's surface is not easy to deposit, filter is difficult to
Filtering.For flocculation iron and clay, it is clean that filter core is difficult recoil.For water backwashing problem, recoiled using gas
(CN200910186725.3), Water Alternate Gas recoil (CN201220703871.6) and gas-liquid mixed recoil
(CN201120225035.7, CNCN200620021906.2) is preferable solution.CN200820025749.1 is also proposed
A kind of gas-liquid is counter to clean dispensing head.But the above method is less complicated when soaking infusion solution filtering over the ground, is difficult to automate, and
It is not ineffective.
In addition, ground-dipping uranium extraction main filtration leachate or leaching agent, are such as recoiled using filtered leachate, no
Only waste the uranium metal of leachate, it is also possible to increase the burden of evaporation tank, increase the risk of radioactive pollution.Therefore, it is necessary to
Design it is a kind of suitable for ground-dipping uranium extraction can back-flushing filtering system and technique, reach that filter effect is good, filter core is easy to recoil, save
With water, uranium metal is not wasted, and reduces labor intensity, improves the purpose of the degree of automation.
Summary of the invention
It is an object of the invention to: in view of the deficiencies of the prior art, in conjunction with ground-dipping uranium extraction own characteristic, provides and soak a kind ofly
Adopting uranium can back-flushing filtering system and method.The solid content feature of the system combination leachate, using the bet of ground-dipping uranium extraction
Liquid (leaching agent) is used as backwash liquid, carries out using the pressure of lower fluid injection itself, and after well being mixed with a large amount of compressed airs
Recoil, reaching well to filter, and save water, do not waste the effect of uranium metal, and can guarantee the recoil effect of filter core very well
Fruit.
Technical scheme is as follows: a kind of ground-dipping uranium extraction can back-flushing filtering system, including it is filter device, static mixed
Clutch, gas bag, lower reservoir container, pressure maintaining valve, non-return valve, gas flowmeter, electromagnetic flowmeter and flow control valve；
The gas bag passes through pressure maintaining valve A, non-return valve A, gas flowmeter, flow control valve A and static mixer phase
Even, for providing compressed air；
The lower reservoir container passes through pressure maintaining valve B, non-return valve B, electromagnetic flowmeter, flow control valve B and static mixing
Device is connected, for providing backwash liquid；
The static mixer passes through recoil tube and filtering for compressed air and lower fluid injection to be sufficiently mixed
Device is connected.
Further, the filter device, using the concatenated mode of dual stage filter apparatus；By by-pass filtration inlet tube,
First level filtering device, secondary filtration inlet tube, two-stage filter and secondary filtration outlet tube are connected in sequence；
Further, the first level filtering device is composed in parallel by n set by-pass filtration system；Every set by-pass filtration system
System is connected in sequence by by-pass filtration liquid feed valve, level-one filter core and by-pass filtration liquid valve；The two-stage filter, by
N set secondary filtration system composes in parallel；Every set secondary filtration system is gone out by secondary filtration liquid feed valve, second level filter core, secondary filtration
Liquid valve is connected in sequence.
Further, the n is 2 or 3, at runtime, has 1 set of by-pass filtration system and 1 set of secondary filtration system is
Redundant filter system.
Further, after the recoil tube and recoil liquid feed valve, level-one filter core or second level filter core, blowdown valve are sequentially connected
Connect sewage pipe.
Further, the level-one filter core and second level filter core, using 316L stainless steel wire mesh foldable filter element.
Further, the filter diameter of level-one filter core is 10-50 μm, and the filter diameter of second level filter core is 5-10 μm.
Further, the static mixer, using SV static mixer, including supervisor and branch pipe, the compression
Air enters from supervisor, and the lower fluid injection enters from branch pipe.
A kind of ground-dipping uranium extraction can backwashed filtering method, use filtration system of the present invention, comprising the following steps:
Step 1: carrying out liquor analysis；
It analyzes underground water or leaches the content and particle diameter distribution of solia particle in liquor, and mainization in analytical solution
Study point, especially because the change of hydrodynamic condition, pH value, Eh value or and response of stratum there may be the component of precipitating, it is right
The variation of solids is predicted in solution, and then determines the filter diameter of level-one filter core and second level filter core；
Step 2: normal filtration；
By leachate or lower fluid injection successively pass through by-pass filtration inlet tube, first level filtering device, secondary filtration inlet tube and
Two-stage filter is filtered, and filtered filtrate is flowed out from secondary filtration outlet tube；
Step 3: backwash operation；
Pressure difference > 0.4MPa before the filter of pressure difference > 0.2Mpa or second level filter core and after filter before the filter of level-one filter core and after filter
When, start spare filtration system, be then turned off the filtration system that need to be backwashed, prepares backwash；
Step 4: pressure being controlled the compressed air in gas bag in 0.4-0.6Mpa by pressure maintaining valve A；By lower fluid injection
Lower fluid injection in container is controlled pressure in 0.6-0.8MPa by pressure maintaining valve B；Successively open flow control valve A and flow tune
Valve B is saved, is sufficiently mixed compressed air in static mixer with lower fluid injection, obtains backwash medium；
Step 5: opening recoil liquid feed valve and blowdown valve, recoil to the level-one filter core and second level filter core that need to backwash
It washes, until iron-free and when without visible solid particle in back-flushing, terminates recoil.
Further, in the backwash medium, the proportion of compressed air and lower fluid injection is volume ratio 5:1-10:1.
Remarkable result of the invention is: determining that filter core filters diameter by leachate analysis, utmostly guarantees filtering accuracy；
It carries out backwashing to avoid wasting using uranium metal caused by stoste using lower fluid injection is leached, and is effectively utilized in system and bets
The pressure of liquid does not have to individually plus pumps；Using SV static mixer, good mixing effect, recoil is thorough, speed is fast；Pass through mixer
It is responsible for air inlet, gas-liquid mixed back flushing filter core is carried out with large scale gas liquid ratio, considerably reduces recoil water.This system and technique
Good filtering, repercussion effect are achieved in ground leaching practice, system is easy to automate.
Detailed description of the invention
Fig. 1 be a kind of ground-dipping uranium extraction of the present invention can back-flushing filtering system structural schematic diagram；
Fig. 2 is the structural schematic diagram of static mixer；
In figure, 1, by-pass filtration inlet tube；2, secondary filtration inlet tube；3, secondary filtration outlet tube；4, recoil tube；5, it arranges
Dirt pipe；6-1, level-one filter core；6-2, second level filter core；7, gas bag；8, lower reservoir container；9-1, pressure maintaining valve A；9-2, pressure maintaining valve B；
10-1, non-return valve A；10-2, non-return valve B；11, gas flowmeter；12, electromagnetic flowmeter；13-1, flow control valve A；13-2,
Flow control valve B；14, static mixer；15-1, by-pass filtration liquid feed valve；15-2, by-pass filtration liquid valve；15-3, second level mistake
Filter liquid feed valve；15-4, secondary filtration liquid valve；15-5, recoil liquid feed valve；15-6, blowdown valve；16, filter device；17, it is responsible for；
18, branch pipe.
Specific embodiment
Combined with specific embodiments below to a kind of ground-dipping uranium extraction of the present invention can back-flushing filtering system and method make
It is further described.
As illustrated in fig. 1 and 2, a kind of ground-dipping uranium extraction can back-flushing filtering system, including filter device 16, static mixer
14, gas bag 7, lower reservoir container 8, pressure maintaining valve, non-return valve, gas flowmeter 11, electromagnetic flowmeter 12 and flow control valve；
The gas bag 7, by pressure maintaining valve A9-1, non-return valve A10-1, gas flowmeter 11, flow control valve A13-1 with
Static mixer 14 is connected, for providing compressed air；
The lower reservoir container 8 passes through pressure maintaining valve B9-2, non-return valve B10-2, electromagnetic flowmeter 12, flow control valve
B13-2 is connected with static mixer 14, for providing lower fluid injection；
The static mixer 14 passes through recoil tube 4 and mistake for compressed air and lower fluid injection to be sufficiently mixed
Device 16 is filtered to be connected.
Further, the filter device 16, using the concatenated mode of dual stage filter apparatus；By by-pass filtration inlet tube
1, first level filtering device, secondary filtration inlet tube 2, two-stage filter and secondary filtration outlet tube 3 are connected in sequence；
Further, the first level filtering device is composed in parallel by n set by-pass filtration system；Every set by-pass filtration system
System is connected in sequence by by-pass filtration liquid feed valve 15-1, level-one filter core 6-1 and by-pass filtration liquid valve 15-2；The second level
Filter device is composed in parallel by n set secondary filtration system；Every set secondary filtration system is by secondary filtration liquid feed valve 15-3, second level
Filter core 6-2, secondary filtration liquid valve 15-4 are connected in sequence.
Further, the n is 2 or 3, at runtime, has 1 set of by-pass filtration system and 1 set of secondary filtration system is
Redundant filter system.
Further, the recoil tube 4 and recoil liquid feed valve 15-5, level-one filter core 6-1 or second level filter core 6-2, blowdown
Valve 15-6 connects sewage pipe 5 after being sequentially connected.
Further, the level-one filter core 6-1 and second level filter core 6-2, using 316L stainless steel wire mesh foldable filter element.
Further, the filter diameter of level-one filter core 6-1 is 10-50 μm, and the filter diameter of second level filter core 6-2 is 5-10 μm.
Further, the static mixer 14, it is described using SV static mixer, including supervisor 17 and branch pipe 18
Compressed air from supervisor 17 enter, the lower fluid injection from branch pipe 18 enter.
A kind of ground-dipping uranium extraction can backwashed filtering method, use filtration system of the present invention, comprising the following steps:
Step 1: carrying out liquor analysis；
It analyzes underground water or leaches the content and particle diameter distribution of solia particle in liquor, and mainization in analytical solution
Study point, especially because the change of hydrodynamic condition, pH value, Eh value or and response of stratum there may be the component of precipitating, it is right
The variation of solids is predicted in solution, and then determines the filter diameter of level-one filter core 6-1 and second level filter core 6-2；
Step 2: normal filtration；
Leachate or lower fluid injection are successively passed through into by-pass filtration inlet tube 1, first level filtering device, secondary filtration inlet tube 2
It is filtered with two-stage filter, obtained filtrate is flowed out from secondary filtration outlet tube 3；
Step 3: backwash operation；
Before the filter of level-one filter core 6-1 and filter after pressure difference > 0.2Mpa or second level filter core 6-2 filter before and filter after pressure difference >
When 0.4MPa, start spare filtration system, be then turned off the filtration system that need to be backwashed, prepares backwash；
Step 4: pressure being controlled the compressed air in gas bag 7 in 0.4-0.6Mpa by pressure maintaining valve A9-1；Will under
Lower fluid injection in reservoir container 8 is controlled pressure in 0.6-0.8MPa by pressure maintaining valve B9-2；Successively open flow control valve
A13-1 and flow control valve B13-2 is sufficiently mixed compressed air in static mixer 14 with lower fluid injection, obtains anti-
Scouring media；
Step 5: opening recoil liquid feed valve 15-5 and blowdown valve 15-6, the level-one filter core 6-1 and second level that need to be backwashed are filtered
Core 6-2 is backwashed, until iron-free and when without visible solid particle in back-flushing, terminates recoil.
Further, in the backwash medium, the proportion of compressed air and lower fluid injection is volume ratio 5:1-10:1.
According to the above backwash technique, at the scene in implementation process, the recoil time of 6 filter cores was at 30-45 minutes, recoil
Rear stage and second level pressure difference are respectively less than 0.1MPa.And water recoil, gas recoil are used, pressure difference is all larger than 0.1MPa after recoil；Using
Gas and water alternately recoils, and recoil time was at 1 hour or more.The consumption recoil water of above-mentioned three kinds of back flush modes at least compares the present embodiment
It is big by 30%.Repercussion effect of the present invention, water-saving, time saving effect are obvious.
Claims (10)
1. a kind of ground-dipping uranium extraction can back-flushing filtering system, it is characterised in that: including filter device (16), static mixer
(14), gas bag (7), lower reservoir container (8), pressure maintaining valve, non-return valve, gas flowmeter (11), electromagnetic flowmeter (12) and flow
Regulating valve；
The gas bag (7) passes through pressure maintaining valve A (9-1), non-return valve A (10-1), gas flowmeter (11), flow control valve A
(13-1) is connected with static mixer (14), for providing compressed air；
The lower reservoir container (8) passes through pressure maintaining valve B (9-2), non-return valve B (10-2), electromagnetic flowmeter (12), flow tune
Section valve B (13-2) is connected with static mixer (14), for providing backwash liquid；
The static mixer (14) passes through recoil tube (4) and mistake for compressed air and lower fluid injection to be sufficiently mixed
Device (16) are filtered to be connected.
2. a kind of ground-dipping uranium extraction as described in claim 1 can back-flushing filtering system, it is characterised in that: the filter device
(16), using the concatenated mode of dual stage filter apparatus；By by-pass filtration inlet tube (1), first level filtering device, secondary filtration feed liquor
Pipe (2), two-stage filter and secondary filtration outlet tube (3) are connected in sequence.
3. a kind of ground-dipping uranium extraction as claimed in claim 2 can back-flushing filtering system, it is characterised in that: the by-pass filtration
Device is composed in parallel by n set by-pass filtration system；Every set by-pass filtration system is by by-pass filtration liquid feed valve (15-1), first-level filtering
Core (6-1) and by-pass filtration liquid valve (15-2) are connected in sequence；The two-stage filter covers secondary filtration system by n
System composes in parallel；Every set secondary filtration system goes out liquid by secondary filtration liquid feed valve (15-3), second level filter core (6-2), secondary filtration
Valve (15-4) is connected in sequence.
4. a kind of ground-dipping uranium extraction as claimed in claim 3 can back-flushing filtering system, it is characterised in that: the n is 2 or 3,
At runtime, having 1 set of by-pass filtration system and 1 set of secondary filtration system is redundant filter system.
5. a kind of ground-dipping uranium extraction as claimed in claim 4 can back-flushing filtering system, it is characterised in that: the recoil tube
(4) it is connected after being sequentially connected with recoil liquid feed valve (15-5), level-one filter core (6-1) or second level filter core (6-2), blowdown valve (15-6)
Sewage pipe (5).
6. a kind of ground-dipping uranium extraction as claimed in claim 3 can back-flushing filtering system, it is characterised in that: the level-one filter core
(6-1) and second level filter core (6-2), using 316L stainless steel wire mesh foldable filter element.
7. a kind of ground-dipping uranium extraction as claimed in claim 3 can back-flushing filtering system, it is characterised in that: level-one filter core (6-1)
Filter diameter be 10-50 μm, the filter diameter of second level filter core (6-2) is 5-10 μm.
8. a kind of ground-dipping uranium extraction as described in claim 1 can back-flushing filtering system, it is characterised in that: the static mixing
Device (14), using SV static mixer, including supervisor (17) and branch pipe (18), the compressed air enters from supervisor (17),
The lower fluid injection enters from branch pipe (18).
9. a kind of ground-dipping uranium extraction can backwashed filtering method, which is characterized in that use the filtration system described in claim 5, packet
Include following steps:
Step 1: carrying out liquor analysis；
Analyze underground water or leach liquor in solia particle content and particle diameter distribution, and the primary chemical in analytical solution at
Point, especially because the change of hydrodynamic condition, pH value, Eh value or and response of stratum there may be the components of precipitating, to solution
The variation of middle solids is predicted, and then determines the filter diameter of level-one filter core (6-1) and second level filter core (6-2)；
Step 2: normal filtration；
Leachate or lower fluid injection are successively passed through into by-pass filtration inlet tube (1), first level filtering device, secondary filtration inlet tube (2)
It is filtered with two-stage filter, filtered filtrate is flowed out from secondary filtration outlet tube (3)；
Step 3: backwash operation；
Before the filter of level-one filter core (6-1) and filter after pressure difference > 0.2Mpa or second level filter core (6-2) filter before and filter after pressure difference >
When 0.4MPa, start spare filtration system, be then turned off the filtration system that need to be backwashed, prepares backwash；
Step 4: pressure being controlled the compressed air in gas bag (7) in 0.4-0.6Mpa by pressure maintaining valve A (9-1)；Will under
Lower fluid injection in reservoir container (8) is controlled pressure in 0.6-0.8MPa by pressure maintaining valve B (9-2)；Flow is successively opened to adjust
Valve A (13-1) and flow control valve B (13-2) carries out compressed air and lower fluid injection in static mixer (14) sufficiently mixed
It closes, obtains backwash medium；
Step 5: recoil liquid feed valve (15-5) and blowdown valve (15-6) are opened, to the level-one filter core (6-1) and second level that need to be backwashed
Filter core (6-2) is backwashed, until iron-free and when without visible solid particle in back-flushing, terminates recoil.
10. a kind of ground-dipping uranium extraction as claimed in claim 8 can backwashed filtering method, it is characterised in that: the backwash
In medium, the proportion of compressed air and lower fluid injection is volume ratio 5:1-10:1.
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| CN201811604195.5A CN109736770B (en) | 2018-12-26 | 2018-12-26 | Backwashing filtering system and method for in-situ leaching uranium mining |
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Cited By (1)
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| CN111335865A (en) * | 2020-03-25 | 2020-06-26 | 核工业北京化工冶金研究院 | Advanced closed type liquid pumping and injecting system for in-situ leaching uranium mining mine |
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