CN104928505A - High intensity leaching method in initial heap leaching - Google Patents
High intensity leaching method in initial heap leaching Download PDFInfo
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- CN104928505A CN104928505A CN201510377627.3A CN201510377627A CN104928505A CN 104928505 A CN104928505 A CN 104928505A CN 201510377627 A CN201510377627 A CN 201510377627A CN 104928505 A CN104928505 A CN 104928505A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The present invention provides a high intensity leaching method in initial heap leaching. The method comprises the steps of: first crushing uranium ore, separating fine fraction and transferring to a leaching field for heap construction; (2) leaching an ore heap by spray leaching agents; employing a leaching agent with high acidity in the initial leaching agent stage namely acidification stage, and spraying continuously 24 hours a day by high spray intensity; (3) adsorbing the leaching liquid obtained in step (2) to recover uranium, adding acid in the absorption tail liquid and returning to be reused as the leaching agent, and sending the saturated resin into a posttreatment process; (4) when the uranium concentration in the leaching liquid is less than 50mg / L or liquid metered leaching rate reaches 85%, conducting quasi tailings acid curing for a few days, washing the heap, returning the washing liquid to be used as leaching agent for the next heap, neutralizing the tailings and discharged the into a tailings storage. The heap leaching method provided by the invention can prevent the phenomena of ore wrapping by precipitates and leaching channel clogging in the acidification stage of ore heap, shorten leaching time and reduce tailings grade.
Description
Technical field
The present invention relates to a kind of Uranium Ore Leaching Heap technology, be specifically related to a kind of dump leaching initial stage high strength leaching method.
Background technology
Existing uranium ore earth's surface dump leaching, ore is transported into dump leaching field through broken (after fractional unit separation of fine particle level) and builds heap, shower-bubble type agent is leached, leach liquor reclaims uranium through absorption (or extraction), return after adsorption tail liquid (or raffinate aqueous phase) adds acid and be used as leaching agent again, saturated resin (or saturated organic phase) enters postprocessing working procedures.When leach liquor uranium concentration is lower than a certain value or after leaching the scheduled time, the initial stage leaches and terminates, and add ripening agent, slaking washed heap with water after several days, and washings returns preparation leaching agent, and tailings is transported into tailings storehouse after neutralization.
Above-mentioned technique is at the leaching initial stage (ore deposit heap acidifying phase), add leaching agent in heap in the process of down permeating, leaching agent and uranium and other material generation chemical reaction, its stripping is entered in solution, the acidity of leaching agent will progressively reduce, pH value rises, when pH value rises to a certain value, and the Cucumber in leaching agent and some resultant meeting hydrolytic precipitation reacted with ore.
These hydrolytic precipitation things some in follow-up leaching process by again dissolving with leach liquor discharge ore deposit pile, but some throw out will no longer be dissolved, they can be deposited on ore particle surface or enter ore crack, parcel ore particle, blocking leach passage, make ore deposit pile perviousness to be deteriorated, leaching cycle extends, and leaching yield reduces.Form the agglomerate of several tons, tens tons time serious, outside these agglomerates, precipitated thing parcel, hinders entering of leaching agent, and when even arrive heap unloading, inside the agglomerate of some precipitated thing parcel or raw ore, leaching agent is at all just contacted with these ores.Accurate tailings peracid slaking effect also obviously reduces.
Summary of the invention
The object of the present invention is to provide a kind of dump leaching initial stage high strength leaching method, it can prevent ore deposit from piling the precipitated thing parcel of acidifying phase ore, leaching channel jam, thus shortens extraction time, improves leaching yield.
Realize technical scheme of the present invention: a kind of dump leaching initial stage high strength leaching method, it comprises the steps:
(1) first heap is built by being transported into dump leaching field after broken for uranium ore also separation of fine particle level;
(2) ore deposit heap shower-bubble type agent is leached; Shower-bubble type agent initial stage, i.e. acidifying phase, adopt the leaching agent of highly acidity, with high spraying intensity, 24 hours every days spray continuously; The acid concentration of the leaching agent of described highly acidity is at 60 ~ 150g/L; Described high spraying intensity is at 30 ~ 80L/M
2h;
(3) carry out absorption to step (2) gained leach liquor and reclaim uranium, adsorption tail liquid returns after adding acid and is used as leaching agent again, and saturated resin enters postprocessing working procedures;
Or carry out extraction and recovery uranium to step (2) gained leach liquor, raffinate aqueous phase returns after adding acid and is used as leaching agent again, and saturated organic phase enters postprocessing working procedures;
(4) after leach liquor uranium concentration <50mg/L or liquid meter leaching yield reach about 85%, carry out accurate tailings acid slaking, slaking washes heap after a couple of days, and washings returns the leaching agent being used as next heap, in tailings and after enter tailings storehouse.
A kind of dump leaching initial stage high strength leaching method as above, it changes normal spraying intensity spray into after step (2) the acidifying phase terminates, but still need the 24 hours every days of spray continuously, and until when guaranteeing to be interrupted spray, leach liquor pH < 2.5.
A kind of dump leaching initial stage high strength leaching method as above, it progressively reduces leaching agent concentration after step (2) the acidifying phase terminates, to guarantee that leach liquor spent acid can meet aftertreatment requirement.
Effect of the present invention is: dump leaching initial stage high strength leaching method of the present invention, at the shower-bubble type agent initial stage, adopt the leaching agent compared with highly acidity, to reduce the leaching agent consumption of acidifying phase (leach liquor pH>2.5), thus the throw out quantity that the impurity that minimizing is brought by leaching agent generates.At the shower-bubble type agent initial stage, adopt high spraying intensity to spray, to shorten acidificatoin time, reduce sedimentary growing amount.At the shower-bubble type agent initial stage, Bian sprayed system continuously with 24 hours every days, to shorten acidificatoin time, reduced sedimentary growing amount.Adopt the present invention to carry out dump leaching, can prevent ore deposit from piling the precipitated thing parcel of acidifying phase ore, leach the phenomenon generation of channel jam, can extraction time be shortened, reduce tailings grade.
Embodiment
Below in conjunction with specific embodiment, a kind of dump leaching initial stage high strength leaching method of the present invention is further described.
Embodiment 1
A kind of dump leaching initial stage high strength leaching method of the present invention, it comprises the steps:
(1) first heap is built by being transported into dump leaching field after broken for uranium ore also separation of fine particle level;
(2) ore deposit heap shower-bubble type agent is leached; Shower-bubble type agent initial stage, i.e. acidifying phase, adopt the leaching agent of highly acidity, with high spraying intensity, 24 hours every days spray continuously; The acid concentration of the leaching agent of described highly acidity is at 100g/L; Described high spraying intensity is at 50L/M
2h;
(3) carry out absorption to step (2) gained leach liquor and reclaim uranium, adsorption tail liquid returns after adding acid and is used as leaching agent again, and saturated resin enters postprocessing working procedures;
Or carry out extraction and recovery uranium to step (2) gained leach liquor, raffinate aqueous phase returns after adding acid and is used as leaching agent again, and saturated organic phase enters postprocessing working procedures;
(4) after leach liquor uranium concentration <50mg/L or liquid meter leaching yield reach about 85%, carry out accurate tailings acid slaking, slaking washes heap after a couple of days, and washings returns the leaching agent being used as next heap, in tailings and after enter tailings storehouse.
After step (2) the acidifying phase terminates, change normal spraying intensity spray into, but still need the 24 hours every days of spray continuously, until when guaranteeing to be interrupted spray, leach liquor pH < 2.5.
Leaching agent concentration is progressively reduced, to guarantee that leach liquor spent acid can meet aftertreatment requirement after step (2) the acidifying phase terminates.
A kind of dump leaching initial stage high strength leaching method of the present invention compared with prior art, can prevent ore deposit from piling the precipitated thing parcel of acidifying phase ore, leach the phenomenon generation of channel jam, can shorten extraction time, reduce tailings grade.
To uranium grade be 0.100% first ore result of implementation as shown in table 1.
Table 1 adopts existing heap leaching method and dump leaching initial stage high strength leaching method of the present invention to leach first ore result
| Existing heap leaching method | The present invention piles leaching method | |
| Enter to pile ore grain size (mm) | -10 | -5+0.3 |
| Leach liquor < 50mg/L required time (my god) | 250 | 35 |
| Accurate tailings grade (%) | 0.018 | 0.013 |
| Final tailings grade (%) | 0.013 | 0.007％ |
| Total extraction time (my god) | 270 | 55 |
Embodiment 2
A kind of dump leaching initial stage high strength leaching method of the present invention, it comprises the steps:
(1) first heap is built by being transported into dump leaching field after broken for uranium ore also separation of fine particle level;
(2) ore deposit heap shower-bubble type agent is leached; Shower-bubble type agent initial stage, i.e. acidifying phase, adopt the leaching agent of highly acidity, with high spraying intensity, 24 hours every days spray continuously; The acid concentration of the leaching agent of described highly acidity is at 80g/L; Described high spraying intensity is at 80L/M
2h;
(3) carry out absorption to step (2) gained leach liquor and reclaim uranium, adsorption tail liquid returns after adding acid and is used as leaching agent again, and saturated resin enters postprocessing working procedures;
Or carry out extraction and recovery uranium to step (2) gained leach liquor, raffinate aqueous phase returns after adding acid and is used as leaching agent again, and saturated organic phase enters postprocessing working procedures;
(4) after leach liquor uranium concentration <50mg/L or liquid meter leaching yield reach about 85%, carry out accurate tailings acid slaking, slaking washes heap after a couple of days, and washings returns the leaching agent being used as next heap, in tailings and after enter tailings storehouse.
After step (2) the acidifying phase terminates, change normal spraying intensity spray into, but still need the 24 hours every days of spray continuously, until when guaranteeing to be interrupted spray, leach liquor pH < 2.5.Leaching agent concentration is progressively reduced, to guarantee that leach liquor spent acid can meet aftertreatment requirement after step (2) the acidifying phase terminates.
A kind of dump leaching initial stage high strength leaching method of the present invention compared with prior art, can prevent ore deposit from piling the precipitated thing parcel of acidifying phase ore, leach the phenomenon generation of channel jam, can shorten extraction time, reduce tailings grade.
To uranium grade be 0.160% second ore result of implementation as shown in table 2.
Table 2 adopts existing heap leaching method and dump leaching initial stage high strength leaching method of the present invention to leach second ore result
| Existing heap leaching method | The present invention piles leaching method | |
| Enter to pile ore grain size (mm) | -5+0.3 | -5+0.3 |
| Leach liquor < 50mg/L required time (my god) | 50 | 30 |
| Accurate tailings grade (%) | 0.023 | 0.014 |
| Final tailings grade (%) | 0.012 | 0.006 |
| Total extraction time (my god) | 70 | 50 |
Embodiment 3
A kind of dump leaching initial stage high strength leaching method of the present invention, it comprises the steps:
(1) first heap is built by being transported into dump leaching field after broken for uranium ore also separation of fine particle level;
(2) ore deposit heap shower-bubble type agent is leached; Shower-bubble type agent initial stage, i.e. acidifying phase, adopt the leaching agent of highly acidity, with high spraying intensity, 24 hours every days spray continuously; The acid concentration of the leaching agent of described highly acidity is at 120g/L; Described high spraying intensity is at 35L/M
2h;
(3) carry out absorption to step (2) gained leach liquor and reclaim uranium, adsorption tail liquid returns after adding acid and is used as leaching agent again, and saturated resin enters postprocessing working procedures;
Or carry out extraction and recovery uranium to step (2) gained leach liquor, raffinate aqueous phase returns after adding acid and is used as leaching agent again, and saturated organic phase enters postprocessing working procedures;
(4) after leach liquor uranium concentration <50mg/L or liquid meter leaching yield reach about 85%, carry out accurate tailings acid slaking, slaking washes heap after a couple of days, and washings returns the leaching agent being used as next heap, in tailings and after enter tailings storehouse.
After step (2) the acidifying phase terminates, change normal spraying intensity spray into, but still need the 24 hours every days of spray continuously, until when guaranteeing to be interrupted spray, leach liquor pH < 2.5.Leaching agent concentration is progressively reduced, to guarantee that leach liquor spent acid can meet aftertreatment requirement after step (2) the acidifying phase terminates.
To uranium grade be 0.268% the third ore result of implementation as shown in table 3.
Table 3 adopts existing leaching method and dump leaching initial stage high strength leaching method of the present invention to leach the third ore result
| Existing heap leaching method | The present invention piles leaching method | |
| Enter to pile ore grain size (mm) | -5+0.3 | -5+0.3 |
| Leach liquor < 50mg/L required time (my god) | 150 | 35 |
| Accurate tailings grade (%) | 0.028 | 0.018 |
| Final tailings grade (%) | 0.018 | 0.009 |
| Total extraction time (my god) | 170 | 55 |
Claims (4)
1. a dump leaching initial stage high strength leaching method, is characterized in that: the method comprises the steps:
(1) first heap is built by being transported into dump leaching field after broken for uranium ore also separation of fine particle level;
(2) ore deposit heap shower-bubble type agent is leached; Shower-bubble type agent initial stage, i.e. acidifying phase, adopt the leaching agent of highly acidity, with high spraying intensity, 24 hours every days spray continuously; The acid concentration of the leaching agent of described highly acidity is at 60 ~ 150g/L; Described high spraying intensity is at 30 ~ 80L/M
2h;
(3) carry out absorption to step (2) gained leach liquor and reclaim uranium, adsorption tail liquid returns after adding acid and is used as leaching agent again, and saturated resin enters postprocessing working procedures;
Or carry out extraction and recovery uranium to step (2) gained leach liquor, raffinate aqueous phase returns after adding acid and is used as leaching agent again, and saturated organic phase enters postprocessing working procedures;
(4) after leach liquor uranium concentration <50mg/L or liquid meter leaching yield reach about 85%, carry out accurate tailings acid slaking, slaking washes heap after a couple of days, and washings returns the leaching agent being used as next heap, in tailings and after enter tailings storehouse.
2. a kind of dump leaching initial stage high strength leaching method according to claim 1, it is characterized in that: after step (2) the acidifying phase terminates, change normal spraying intensity spray into, but still need the 24 hours every days of spray continuously, until when guaranteeing to be interrupted spray, leach liquor pH < 2.5.
3. a kind of dump leaching initial stage high strength leaching method according to claim 1, is characterized in that: after step (2) the acidifying phase terminates, progressively reduce leaching agent concentration, to guarantee that leach liquor spent acid can meet aftertreatment requirement.
4. a kind of dump leaching initial stage high strength leaching method according to claim 1, is characterized in that: the acid concentration of the leaching agent of described highly acidity is at 80 ~ 120g/L; Described high spraying intensity is at 35 ~ 80L/M
2h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510377627.3A CN104928505A (en) | 2015-07-02 | 2015-07-02 | High intensity leaching method in initial heap leaching |
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| CN201510377627.3A CN104928505A (en) | 2015-07-02 | 2015-07-02 | High intensity leaching method in initial heap leaching |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506279A (en) * | 2015-12-30 | 2016-04-20 | 核工业北京化工冶金研究院 | Method for preventing ore heap hardening |
| CN107460348A (en) * | 2017-05-26 | 2017-12-12 | 核工业北京化工冶金研究院 | It is a kind of to handle the method rich in fluorite uranium ore |
| CN107723459A (en) * | 2017-09-15 | 2018-02-23 | 核工业北京化工冶金研究院 | A kind of method that coated uranium molybdenum ore granulation roasting heap extraction takes uranium molybdenum |
| CN107739850A (en) * | 2017-09-15 | 2018-02-27 | 核工业北京化工冶金研究院 | The clean preparation method of uranium molybdenum is reclaimed in a kind of uranium molybdenum ore from coated |
| CN107746967A (en) * | 2017-10-09 | 2018-03-02 | 核工业北京化工冶金研究院 | The production technology of uranium molybdenum is reclaimed in a kind of molybdenum ore acidleach tailings from uranium |
| CN107858513A (en) * | 2017-10-09 | 2018-03-30 | 核工业北京化工冶金研究院 | A kind of method that uranium molybdenum is extracted in the molybdenum ore acidleach tailings from uranium |
| CN108149034A (en) * | 2017-11-21 | 2018-06-12 | 核工业北京化工冶金研究院 | A kind of method for minimizing acid heap leaching mine tailings library waste |
| CN110331281A (en) * | 2019-07-10 | 2019-10-15 | 核工业北京化工冶金研究院 | A kind of in-situ acid uranium leaching list exploiting field independence acidization tool |
| CN111074069A (en) * | 2020-02-05 | 2020-04-28 | 东华理工大学 | Surface tank leaching process for classified pile building |
| 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 |
| CN115232994A (en) * | 2022-05-19 | 2022-10-25 | 核工业北京化工冶金研究院 | Method for treating uranium-containing chlorine-containing high-acidity resin transformation liquid |
-
2015
- 2015-07-02 CN CN201510377627.3A patent/CN104928505A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506279A (en) * | 2015-12-30 | 2016-04-20 | 核工业北京化工冶金研究院 | Method for preventing ore heap hardening |
| CN107460348A (en) * | 2017-05-26 | 2017-12-12 | 核工业北京化工冶金研究院 | It is a kind of to handle the method rich in fluorite uranium ore |
| CN107723459A (en) * | 2017-09-15 | 2018-02-23 | 核工业北京化工冶金研究院 | A kind of method that coated uranium molybdenum ore granulation roasting heap extraction takes uranium molybdenum |
| CN107739850A (en) * | 2017-09-15 | 2018-02-27 | 核工业北京化工冶金研究院 | The clean preparation method of uranium molybdenum is reclaimed in a kind of uranium molybdenum ore from coated |
| CN107746967A (en) * | 2017-10-09 | 2018-03-02 | 核工业北京化工冶金研究院 | The production technology of uranium molybdenum is reclaimed in a kind of molybdenum ore acidleach tailings from uranium |
| CN107858513A (en) * | 2017-10-09 | 2018-03-30 | 核工业北京化工冶金研究院 | A kind of method that uranium molybdenum is extracted in the molybdenum ore acidleach tailings from uranium |
| CN108149034A (en) * | 2017-11-21 | 2018-06-12 | 核工业北京化工冶金研究院 | A kind of method for minimizing acid heap leaching mine tailings library waste |
| CN108149034B (en) * | 2017-11-21 | 2020-07-28 | 核工业北京化工冶金研究院 | Method for minimizing waste of acid-process heap leaching mine tailings pond |
| CN110331281A (en) * | 2019-07-10 | 2019-10-15 | 核工业北京化工冶金研究院 | A kind of in-situ acid uranium leaching list exploiting field independence acidization tool |
| CN111074069A (en) * | 2020-02-05 | 2020-04-28 | 东华理工大学 | Surface tank leaching process for classified pile building |
| 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 |
| CN115232994A (en) * | 2022-05-19 | 2022-10-25 | 核工业北京化工冶金研究院 | Method for treating uranium-containing chlorine-containing high-acidity resin transformation liquid |
| CN115232994B (en) * | 2022-05-19 | 2024-01-12 | 核工业北京化工冶金研究院 | Method for treating uranium-containing chlorine-containing high-acidity resin transfer fluid |
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Application publication date: 20150923 |