CN106507825B - A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore - Google Patents
A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine oreInfo
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- CN106507825B CN106507825B CN200910124354.6A CN200910124354A CN106507825B CN 106507825 B CN106507825 B CN 106507825B CN 200910124354 A CN200910124354 A CN 200910124354A CN 106507825 B CN106507825 B CN 106507825B
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- Prior art keywords
- uranium
- pelletize
- fine ore
- ore
- leaching
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Abstract
The present invention provides the acid system pelletize heap leaching method that a kind of carbonato peracid consumes uranium fine ore, and carbonato peracid is consumed uranium fine ore pelletize, builds heap, then use dilution heat of sulfuric acid ferri-trickle leaching by which.Before the uranium fine ore pelletize, first carry out mixing low-kappa number, will concentration mix in 250g/L～500g/L sulfuric acid solutions, the stirring of water and uranium fine ore, obtain the uranium-containing materials of uniform moistening, then placement 24～120 hours；Sulfuric acid solution quality used for uranium fine ore quality 5%～10%, water quality used for uranium fine ore quality 10%～20%.The invention is characterized in that the measures such as stack height are built in premixing acid treatment and control, carbonate components and other acid consumpting substances in destruction Ore, improve the mechanical strength of pelletize pellet, eliminate the destruction for drenching leaching carbon dioxide in process pellet, improve the pouring leaching intensity of pelletize pellet, prevent because leachate spent acid is too low and reprecipitation occurs, so as to improve the permeability of ore deposit heap, shorten leaching cycle.
Description
Technical field
The invention belongs to uranium ore processing method, and in particular to a kind of carbonato peracid consumption uranium fine ore
Acid system pelletize heap leaching method.
Background technology
Ore pelletize is to improve one of maximally effective approach of the heap permeability of ore deposit containing mud.Because pelletize can make carefully
Granule ore deposit is utilized effectively and obtains larger granularity, and the increasing of particle diameter is for the intrinsic permeability of ore deposit heap
There is significant impact.By adding the wetting agent of binding agent and heterogeneity toward material, and constantly roll into
Ball so that fine fraction Ore is again intensive, so as to change Ore physical property (as density, voidage,
Shape, size and mechanical strength etc.) and chemical property (such as chemical composition, redox state etc.), no
The permeability of dump leaching ore deposit heap can be only greatly enhanced, and can avoid building the size segregation during heap,
Infiltration so as to ensure whole ore deposit heap is uniform.Additionally, in granulation process by take addition leaching agent,
The measures such as oxidant can strengthen the leaching of Ore, so as to accelerate leaching process, shorten leaching cycle, carry
The high metal response rate, reduces reagent consumption and product cost.
Existing acid system pelletize heap Leaching is by adding binding agent toward material and containing 20%～30% sulphuric acid
Fountain solution, and constantly rolling balling so that fine fraction Ore is again intensive.This acid consumption low to process,
The low Ore of carbonate content is suitable.But for the Ore that high carbonate containing, peracid consume directly is adopted
Acid system pelletize dump leaching still suffers from some problems, is mainly shown as that the sulphuric acid added by fountain solution is limited, no
The carbonate components that more fully can be destroyed in Ore so that because carbon dioxide escapes during leaching is drenched
Is gone out and ore particle is caused destruction, reduce the permeability of ore deposit heap so that leaching cycle extends.Although pass through
The sulfuric acid concentration for improving fountain solution can increase the addition of sulphuric acid, but there is the defect of two aspects.
First fountain solution sulfuric acid concentration is too high, brings difficulty to operation；Which two is that fountain solution sulfuric acid concentration is too high
(more than 30%), the adhesive property degraded of binding agent, the mechanical strength of pelletize pellet reduce so that drenching
Wreck during leaching.
Content of the invention
It is an object of the invention to provide a kind of carbonato peracid consumes the acid system pelletize dump leaching side of uranium fine ore
Method, its carbonate components that can be destroyed in Ore and other acid consumpting substances, improve the pouring leaching of pelletize pellet
Intensity, eliminates the destruction for drenching leaching carbon dioxide in process effusion to pellet, prevents because leachate spent acid is too low
And there is reprecipitation, so as to improve the permeability of ore deposit heap, shorten leaching cycle.
Realize the technical scheme of the object of the invention：A kind of carbonato peracid consumes the acid system pelletize of uranium fine ore
Carbonato peracid is consumed uranium fine ore pelletize by heap leaching method, its, is built heap, is then drenched with dilution heat of sulfuric acid
Filter is leached.Before the uranium fine ore pelletize, first carry out mixing low-kappa number, will concentration in 250g/L～500g/L
The stirring of sulfuric acid solution, water and uranium fine ore mix, obtains the uranium-containing materials of uniform moistening, then placement 24～
120 hours；Sulfuric acid solution quality used for uranium fine ore quality 5%～10%, water quality used are uranium powder
The 10%～20% of mineral nitrogen amount.
A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore as above, and which will be mixed
The uranium-containing materials obtained after low-kappa number are crushed to granularity≤10mm, then with concentration in 200g/L～300
G/L sulfuric acid solutions make fountain solution, constantly roll and form uranium-bearing globular material, obtained globular material diameter
Scope is in 5mm～12mm；Sulphuric acid quality used for uranium fine ore quality 1%～4%；Obtained ball
Maintenance 24 hours～72 hours placed by shape material.
A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore as above, and which uses machine
Tool method by pelletize after uranium-bearing globular material build heap, the height of built heap is in 1.5m～2.0m.
Effect of the invention is that：The present invention consumes the existing acid system pelletize heap Leaching of mud ore mining for peracid
The technical problem that processing is present, builds the measures such as stack height by taking premixing acid treatment and control, destroys ore deposit
Carbonate components and other acid consumpting substances in stone, improve the mechanical strength of pelletize pellet, eliminate pouring dipped
The destruction of carbon dioxide pellet in journey, improves the pouring leaching intensity of pelletize pellet, prevents because of leachate spent acid too
Low and reprecipitation occurs, so as to improve the permeability of ore deposit heap, shorten leaching cycle.
The inventive method has advantages below：
(1) Uranium extraction rate is high, can reach more than 96%.
(2) leaching cycle is short, including pretreatment time and leaching time, is usually no more than 20 days.
(3) liquid-solid ratio is leached little, uranium concentration height in leachate is exchanged beneficial to resin ion or solvent extraction
Concentrating and purifying process.
Specific embodiment
With reference to the acid system pelletize that specific embodiment consumes uranium fine ore to carbonato peracid of the present invention
Heap leaching method is further described.
Embodiment 1
Uranium fine ore：Uranium grade 0.465%, calcium carbonate content 6.80%, carbonic acid content of magnesium 2.50%, three oxygen
Change two aluminium contents 9.77%, ferric oxide content 9.48%, ferrous oxide content 4.31%, ore grain size
≤0.3mm.
Mix low-kappa number：It is that 250g/L sulfuric acid solutions, the stirring of water and above-mentioned uranium fine ore mix by concentration, sulfur
The addition quality of acid solution for uranium fine ore quality 6%, the addition quality of water is the 20% of uranium fine ore quality
(including Ore water content), obtains the uranium-containing materials of uniform moistening, 48 hours standing times.
Pelletize：The uranium-containing materials that obtain after low-kappa number will be mixed and are crushed to granularity≤10mm, then with
200g/L sulfuric acid solutions make the continuous rolling balling pelletize of fountain solution, globular material diameter in 5mm～12mm,
Spherical pellets curing time 48 hours.
Build heap：Mechanically by pelletize after uranium-bearing globular material pile height for 1.5m, have certain
The ore storage of geometry.
Ferri-trickle leaching：Uranium-bearing leachate, dilute sulfuric acid are obtained to above-mentioned ore deposit heap ferri-trickle leaching with dilution heat of sulfuric acid
Solution concentration is 15g/L, 15 days leaching time.
As a result：Ore deposit heap permeability ＞ 100L/ (h m all the time2), Uranium extraction rate 96.1%.
Embodiment 2
Uranium fine ore：Uranium grade 0.465%, calcium carbonate content 6.80%, carbonic acid content of magnesium 2.50%, three oxygen
Change two aluminium contents 9.77%, ferric oxide content 9.48%, ferrous oxide content 4.31%, ore grain size
≤0.3mm.
Mix low-kappa number：It is that 350g/L sulfuric acid solutions, the stirring of water and above-mentioned uranium fine ore mix by concentration, sulfur
The addition quality of acid solution for uranium fine ore quality 10%, the addition quality of water is the 15% of uranium fine ore quality
(including Ore water content), obtains the uranium-containing materials of uniform moistening, 24 hours standing times.
Pelletize：The uranium-containing materials that obtain after low-kappa number will be mixed and are crushed to granularity≤10mm, then with
300g/L sulfuric acid solutions make the continuous rolling balling pelletize of fountain solution, globular material diameter in 5mm～12mm,
Spherical pellets curing time 72 hours.
Build heap：Mechanically by pelletize after uranium-bearing globular material pile height for 2.0m, have certain
The ore storage of geometry.
Ferri-trickle leaching：Uranium-bearing leachate, dilute sulfuric acid are obtained to above-mentioned ore deposit heap ferri-trickle leaching with dilution heat of sulfuric acid
Solution concentration is 18g/L, 15 days leaching time.
As a result：Ore deposit heap permeability ＞ 100L/ (h m all the time2), Uranium extraction rate 97.1%.
Embodiment 3
Uranium fine ore：Uranium grade 0.465%, calcium carbonate content 6.80%, carbonic acid content of magnesium 2.50%, three oxygen
Change two aluminium contents 9.77%, ferric oxide content 9.48%, ferrous oxide content 4.31%, ore grain size
≤0.3mm.
Mix low-kappa number：It is that 500g/L sulfuric acid solutions, the stirring of water and above-mentioned uranium fine ore mix by concentration, sulfur
The addition quality of acid solution for uranium fine ore quality 8%, the addition quality of water is the 10% of uranium fine ore quality
(including Ore water content), obtains the uranium-containing materials of uniform moistening, 120 hours standing times.
Pelletize：Uranium-containing materials particle size after cracking≤the 10mm obtained after low-kappa number will be mixed, then with 250g/L
Sulfuric acid solution makees the continuous rolling balling pelletize of fountain solution, and globular material diameter is in 5mm～12mm, spherical
Pellet curing time 24 hours.
Build heap：Mechanically by pelletize after uranium-bearing globular material pile height for 1.5m, have certain
The ore storage of geometry.
Ferri-trickle leaching：Uranium-bearing leachate, dilute sulfuric acid are obtained to above-mentioned ore deposit heap ferri-trickle leaching with dilution heat of sulfuric acid
Solution concentration is 20g/L, 15 days leaching time.
As a result：Ore deposit heap permeability ＞ 100L/ (h m all the time2), Uranium extraction rate 96.6%.
Embodiment 4
Uranium fine ore：Uranium grade 0.465%, calcium carbonate content 6.80%, carbonic acid content of magnesium 2.50%, three oxygen
Change two aluminium contents 9.77%, ferric oxide content 9.48%, ferrous oxide content 4.31%, ore grain size
≤0.3mm.
Mix low-kappa number：It is that 300g/L sulfuric acid solutions, the stirring of water and above-mentioned uranium fine ore mix by concentration, sulfur
The addition quality of acid solution for uranium fine ore quality 9%, the addition quality of water is the 15% of uranium fine ore quality
(including Ore water content), obtains the uranium-containing materials of uniform moistening, 48 hours standing times.
Pelletize：The uranium-containing materials that obtain after low-kappa number will be mixed and are crushed to granularity≤10mm, then with
200g/L sulfuric acid solutions make the continuous rolling balling pelletize of fountain solution, globular material diameter in 5mm～12mm,
Spherical pellets curing time 24 hours.
Build heap：Mechanically by pelletize after uranium-bearing globular material pile height for 1.8m, have certain
The ore storage of geometry.
Ferri-trickle leaching：Uranium-bearing leachate, dilute sulfuric acid are obtained to above-mentioned ore deposit heap ferri-trickle leaching with dilution heat of sulfuric acid
Solution concentration is 15g/L, 15 days leaching time.
As a result：Ore deposit heap permeability ＞ 100L/ (h m all the time2), Uranium extraction rate 97.4%.
Embodiment 5
Uranium fine ore：Uranium grade 0.465%, calcium carbonate content 6.80%, carbonic acid content of magnesium 2.50%, three oxygen
Change two aluminium contents 9.77%, ferric oxide content 9.48%, ferrous oxide content 4.31%, ore grain size
≤0.3mm.
Mix low-kappa number：It is that 500g/L sulfuric acid solutions, the stirring of water and above-mentioned uranium fine ore mix by concentration, sulfur
The addition quality of acid solution for uranium fine ore quality 9%, the addition quality of water is the 15% of uranium fine ore quality
(including Ore water content), obtains the uranium-containing materials of uniform moistening, 24 hours standing times.
Pelletize：The uranium-containing materials that obtain after low-kappa number will be mixed and be crushed to -10mm, then with 200g/L sulfur
Acid solution makees the continuous rolling balling pelletize of fountain solution, globular material diameter in 5mm～10mm, spherical grain
Material curing time 48 hours.
Build heap：Mechanically by pelletize after uranium-bearing globular material pile height for 1.5m, have certain
The ore storage of geometry.
Ferri-trickle leaching：Uranium-bearing leachate, dilute sulfuric acid are obtained to above-mentioned ore deposit heap ferri-trickle leaching with dilution heat of sulfuric acid
Solution concentration is 20g/L, 15 days leaching time.
As a result：Ore deposit heap permeability ＞ 100L/ (h m all the time2), Uranium extraction rate 97.2%.
The invention provides a kind of carbonato peracid consumes the acid system pelletize heap leaching method of fine ore, which is main
It is characterized in that before pelletize low-kappa number measure of mixing of taking, the carbonate components of decomposing ore eliminate leaching leaching
Go out carbon dioxide in process effusion to the destruction of pellet and to produce calcium sulfate scaling infiltrative to ore deposit heap bad
Affect；Select appropriate seam height, it is to avoid the ore particles of ore bed bottom occur under gravity
Deform and become arrangement closely and maintain leaching solution that necessary acidity is migrated in ore deposit heap, prevent the uranium for dissolving
There is reprecipitation with other metal ions and affect the permeability and leaching effect of ore deposit heap.The method can contract
Short leaching cycle, improves Uranium extraction rate.And leachate uranium concentration is high, beneficial to recycling.
The purpose for mixing acid is before Ore pelletize, by the carbonate in Ore and the reaction of other acid consumpting substances
Fall, impact during elimination ferri-trickle leaching to pellet.In addition, pretreatment produces calcium sulfate, it is favorably improved
The mechanical strength of pelletize material.Acid amount is mixed by the carbonate components and other acid consumpting substance compositions in Ore
Content determines.When mixing low-kappa number, it is suitable with 5%～10% to mix acid amount.
Mix low-kappa number moisture higher, uniformity coefficient is better, react more abundant, but consider production operation
Convenient and requirement of the next step granulating working procedure to Ore moisture content, when mixing low-kappa number, moisture content should be controlled 10
%～15%.
The low-kappa number time is mixed more than 24 hours, is reacted fully completely, the permeability of ore deposit heap is imitated with leaching
Fruit does not affect, it is contemplated that next step granulating working procedure to Ore moisture and is easy to the requirement for operating, and mixes sour pre-
Process standing time can make moisture natural evaporation in Ore with longer, and after reducing pretreatment, Ore contains
The water yield.General suitable with 24 hours～120 hours.
Reprecipitation after dissolving is a major issue in the acid system extract technology of uranium.In uranium and other gold
After category ion is dissolved, it is necessary to which remaining certain excess acid affects oozing for ore deposit heap to prevent reprecipitation
Permeability and leaching effect.Although Hydrolysis Reactions of Metal-ions precipitation can discharge a certain amount of acid, this is to reducing Ore
Leach acid consumption be beneficial, but be deposited in ore deposit heap, will impact ore deposit heap osmotic evenness, seriously
The leaching effect of uranium is affected, so reprecipitation phenomenon goes out after dissolving should be avoided in whole leaching process as far as possible
Existing.It is well known that ore deposit stack layers are higher, the distance walked by leaching solution is longer, and the acid in leaching solution may be
When whole process passes through, future runs out, and reprecipitation phenomenon occurs.Ore deposit stack layers are higher simultaneously, to mud ore deposit pelletize
The requirement of mechanical strength of pellet is higher, and the ore particles of otherwise ore bed bottom become under gravity
Shape and become arrangement closely, the permeability of ore deposit heap certainly will be affected, and be difficult to obtain and supported to leach U (VI)
When necessary oxygen.When peracid consumption mud ore deposit pelletize dump leaching is leached, it is necessary to the height of strict control ore deposit stack layers
Degree.According to result of study, leached using thin layer (1.5m～2.0m) proper.
Claims (3)
1. a kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore, and which will be carbonato
Peracid consumes uranium fine ore pelletize, builds heap, then uses dilution heat of sulfuric acid ferri-trickle leaching, it is characterised in that at this
Before uranium fine ore pelletize, first carry out mixing low-kappa number, will concentration be 250g/L～500g/L sulfuric acid solutions,
Water is mixed with the stirring of uranium fine ore, is obtained the uranium-containing materials of uniform moistening, is then placed 24～120 hours；
Sulfuric acid solution quality used for uranium fine ore quality 5%～10%, water quality used is uranium fine ore quality
10%～20%.
2. a kind of carbonato peracid according to claim 1 consumes the acid system pelletize dump leaching of uranium fine ore
Method, it is characterised in that：The uranium-containing materials that obtain after low-kappa number will be mixed and be crushed to granularity≤10mm, so
Afterwards with concentration as 200g/L～300g/L sulfuric acid solutions make fountain solution, constantly roll and form uranium-bearing round
Material, obtained globular material diameter range is in 5mm～12mm；Sulphuric acid quality used is uranium fine ore matter
The 1%～4% of amount；Obtained globular material places maintenance 24 hours～72 hours.
3. a kind of carbonato peracid according to claim 1 and 2 consumes the acid system pelletize of uranium fine ore
Heap leaching method, it is characterised in that：Mechanically by pelletize after uranium-bearing globular material build heap, built heap
Height in 1.5m～2.0m.
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| CN200910124354.6A CN106507825B (en) | 2009-12-10 | 2009-12-10 | A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore |
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| CN200910124354.6A CN106507825B (en) | 2009-12-10 | 2009-12-10 | A kind of carbonato peracid consumes the acid system pelletize heap leaching method of uranium fine ore |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893298A (en) * | 2020-08-20 | 2020-11-06 | 核工业北京化工冶金研究院 | Heap leaching treatment process for low-grade uranium ore rich in gypsum |
| CN115216654A (en) * | 2021-04-21 | 2022-10-21 | 核工业北京化工冶金研究院 | Method for comprehensively recovering metals from carbonate type uranium ores rich in calcium and magnesium |
-
2009
- 2009-12-10 CN CN200910124354.6A patent/CN106507825B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893298A (en) * | 2020-08-20 | 2020-11-06 | 核工业北京化工冶金研究院 | Heap leaching treatment process for low-grade uranium ore rich in gypsum |
| CN115216654A (en) * | 2021-04-21 | 2022-10-21 | 核工业北京化工冶金研究院 | Method for comprehensively recovering metals from carbonate type uranium ores rich in calcium and magnesium |
| CN115216654B (en) * | 2021-04-21 | 2023-10-20 | 核工业北京化工冶金研究院 | Method for comprehensively recovering metal from carbonate type uranium ore rich in calcium and magnesium |
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