CN101560613B - Intensified uranium ore heap leaching method - Google Patents
Intensified uranium ore heap leaching method Download PDFInfo
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- CN101560613B CN101560613B CN2009101437787A CN200910143778A CN101560613B CN 101560613 B CN101560613 B CN 101560613B CN 2009101437787 A CN2009101437787 A CN 2009101437787A CN 200910143778 A CN200910143778 A CN 200910143778A CN 101560613 B CN101560613 B CN 101560613B
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Abstract
The invention provides an intensified uranium ore heap leaching method, which comprises the following steps: (1) uranium ores are crushed firstly and then transported to a heap leaching field for heaping; (2) a leaching agent is sprayed on stock heap for leaching; (3) leachate obtained from step (2) is absorbed or extracted. Saturated resin containing metallic uranium or saturated organic phase goes through a post treatment process, and absorption tailing solution or raffinate water phase is added with acid and then returned for being used as a leaching agent for the next heap; when the leaching agent is sprayed in step (2), the leaching agent spraying is called off if the leaching ratio of the metallic uranium reaches 70 percent to 80 percent. After prospective tailings are dried and heaped for a plurality of days, a curing agent with a weight of 0.08 to 0.12 time of that of the prospective tailings is used for curing and the prospective tailings are cured for a plurality of days and then leached in a sprayed manner. The leachate obtained from sprayed leaching can return and be used as the leaching agent for the next heap. After the neutralization, the tailings are discharged intoa tailing tank. The uranium ores are heap leached by the method so that the grade of the tailings can be reduced and leaching time can be shortened.
Description
Technical field
The present invention relates to a kind of uranium ore dump leaching technology, be specifically related to a kind of intensified uranium ore heap leaching method.
Background technology
Existing uranium ore face of land dump leaching, ore is transported into the dump leaching field and builds heap after fragmentation, the spray leaching agent leaches, and leach liquor reclaims uranium metal through absorption or extraction, adsorption tail liquid or raffinate water are added and are returned after the acid as leaching agent again, and saturated resin (or saturated organic phase) enters postprocessing working procedures.After the leach liquor uranium concentration is lower than a certain value or leaches the scheduled time, leach and finish, wash heap with water.Tailings enters the tailings storehouse after neutralizing treatment.Existing heap leaching method flow process as shown in Figure 1.
Above-mentioned technology leaches the initial stage, and the leaching agent acid concentration is higher (to be generally the H of 50g/L
2SO
4), reduce gradually later on, can satisfy the aftertreatment technology requirement with the spent acid that guarantees leach liquor.Later stage leaching agent acid concentration is very low (to be generally the H of 5g/L owing to leach
2SO
4), it is very little to leach power, causes extraction time very long, and cinder grade is higher.
Summary of the invention
The object of the present invention is to provide a kind of intensified uranium ore heap leaching method that reduces cinder grade, shortens extraction time.
Realize the technical scheme of the object of the invention: a kind of intensified uranium ore heap leaching method, it comprises the steps: that (1) elder generation builds heap with being transported into the dump leaching field after the uranium ore fragmentation; (2) ore deposit heap spray leaching agent is leached; (3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water can be added the leaching agent that returns after the acid again as next heap; When it sprays leaching agent in step (2), after the leaching yield of uranium metal reaches 70～80%, stop to spray leaching agent, the accurate tailings of gained is dried in the air heap after a couple of days, ripening agent with 0.08～0.12 times of accurate tailings weight carries out slaking, slaking is aimed at tailings again and is drenched and soak after a couple of days, drench the leach liquor that soaks gained and can return leaching agent as next heap, in the tailings and after enter the tailings storehouse.
Aforesaid a kind of intensified uranium ore heap leaching method, it leaches the initial stage at step (2) spray leaching agent, adopts high spraying intensity spray leaching agent, leach as early as possible so that wait to soak uranium metal, reduce spraying intensity later on gradually, after leaching yield reaches 70～80%, stop to spray leaching agent.
Aforesaid a kind of intensified uranium ore heap leaching method, it is described at step (2) the spray leaching agent leaching initial stage, adopts high spraying intensity spray leaching agent, and the spraying intensity of its leaching agent is greater than 30L/m
2H.
Aforesaid a kind of intensified uranium ore heap leaching method, its described slaking is aimed at tailings again and is drenched and soak after a couple of days, adsorption tail liquid or raffinate water that the leacheate that it adopted produces for step (3) earlier, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than certain value after, adopt the water wash heap again, leach liquor after the slaking of gained and slag washing water return again as the next leaching agent of piling.
Aforesaid a kind of intensified uranium ore heap leaching method, it can carry out the above slaking of secondary or secondary for refractory mineral, promptly repeats secondary or twice above ripening agent slaking a couple of days with 0.08～0.12 times of ore weight.
Aforesaid a kind of intensified uranium ore heap leaching method, it can carry out the above slaking of secondary or secondary for refractory mineral, promptly carries out secondary or twice above ripening agent slaking a couple of days with 0.08～0.12 times of ore weight; When carrying out secondary or the slaking more than the secondary, the acid concentration of the ripening agent that the acid concentration value of the ripening agent that adopts during the n time slaking adopts during greater than the n-1 time slaking, the gained leach liquor can return and add the ripening agent of acid as the n-1 time slaking of next heap after the n time slaking, or makes the eluent of the accurate tailings after the n-1 time slaking of next heap.
Aforesaid any one intensified uranium ore heap leaching method, ripening agent slaking a couple of days of 0.08～0.12 times of ore weight of its described usefulness, the adding method of its ripening agent is a spraying method, the ripening agent acid concentration is at 100～500g/L.
Aforesaid any one intensified uranium ore heap leaching method, the time of its described usefulness ripening agent slaking was at 4～15 days.
Aforesaid any one intensified uranium ore heap leaching method, its described aligning tailings dry in the air the heap time at 3～7 days.
Effect of the present invention is: adopt the inventive method to carry out intensified uranium ore heap leaching, its accurate tailings sprays slaking with high concentrated acid, can shorten extraction time, significantly reduces cinder grade.Adopt high spraying intensity to drench at the leaching initial stage and soak, can quicken metal and leach, shorten extraction time.
Description of drawings
Fig. 1 is existing heap leaching method schema;
Fig. 2 is embodiment 1 a described intensified uranium ore heap leaching method process flow sheet;
Fig. 3 is embodiment 4 described intensified uranium ore heap leaching method process flow sheets.
Embodiment
Below in conjunction with the drawings and specific embodiments intensified uranium ore heap leaching method of the present invention is further described.
Embodiment 1
As shown in Figure 2, adopt intensified uranium ore heap leaching method of the present invention, head grade is carried out dump leaching at 0.110% first ore, its concrete steps are as follows:
(1) builds heap with being transported into the dump leaching field after the uranium ore fragmentation earlier;
(2) ore deposit heap spray leaching agent (sulfuric acid) is leached, the initial stage is adopted high spraying intensity spray leaching agent, and spraying intensity is greater than 30L/m
2H leaches as early as possible so that wait to soak uranium metal, reduces spraying intensity later on gradually, and the leaching yield that leaches uranium metal after 25 days reaches 75%, stops to spray leaching agent;
(3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water return leaching agent or the following ripening agent that remakes next heap after can adding sulfuric acid;
The accurate tailings of step (2) gained was dried in the air heap after 3 days, the ripening agent of 0.1 times of accurate tailings weight of spray carries out slaking, ripening agent is the sulfuric acid of acid concentration 300g/L, slaking is aimed at tailings again and is drenched and soak after 10 days, adopted eluent be earlier above-mentioned adsorption tail liquid or raffinate water, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than 100mg/L, adopt the water wash heap again, accurate tailings leach liquor after the slaking of gained and slag washing water return again as the next leaching agent of piling.
Intensified uranium ore heap leaching method of the present invention compared with prior art can reduce cinder grade, shorten extraction time, and is specifically as shown in table 1.
Table 1 adopts existing leaching method and the inventive method to leach first ore result
| Existing dump leaching method | Dump leaching method of the present invention | |
| The ore reduction granularity (mm) | -4 | -4 |
| Leaching agent spraying intensity (L/m 2h) | 20 | Greater than 30 |
| The uranium leaching yield reach 75% required time (my god) | 30 | 25 |
| From |
20 | 20 |
| Tailings grade (%) | 0.020 | 0.008 |
| Average extraction time | 50 | 48 |
Embodiment 2
Adopt intensified uranium ore heap leaching method of the present invention, head grade is carried out dump leaching at 0.124% second ore, its concrete steps are as follows:
(1) builds heap with being transported into the dump leaching field after the uranium ore fragmentation earlier;
(2) ore deposit heap spray leaching agent (sulfuric acid) is leached, the initial stage is adopted high spraying intensity spray leaching agent, and spraying intensity is greater than 30L/m
2H leaches as early as possible so that wait to soak uranium metal, reduces spraying intensity later on gradually, and the leaching yield of uranium metal reaches 70% after 30 days, stops to spray leaching agent;
(3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water can be added leaching agent or the ripening agent that returns behind the sulfuric acid again as next heap;
The accurate tailings of step (2) gained was dried in the air heap after 5 days, the ripening agent of 0.1 times of accurate tailings weight of spray carries out slaking, ripening agent is the sulfuric acid of acid concentration 300g/L, slaking is aimed at tailings and is drenched and soak after 10 days, adopted eluent be earlier above-mentioned adsorption tail liquid or raffinate water, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than 100mg/L after, adopt the water wash heap again, accurate tailings leach liquor after the slaking of gained and slag washing water return again as the next leaching agent of piling.
Intensified uranium ore heap leaching method of the present invention compared with prior art can reduce cinder grade, shorten extraction time, and is specifically as shown in table 2.
Table 2 adopts existing leaching method and the inventive method to leach second ore result
| Existing dump leaching method | Dump leaching method of the present invention | |
| The ore reduction granularity (mm) | -10 | -10 |
| Leaching agent spraying intensity (L/m 2h) | 15 | Greater than 30 |
| The uranium leaching yield reach 70% required time (my god) | 50 | 30 |
| From leaching yield 70% to leaching end required time (my god) | 50 | 20 |
| Tailings grade (%) | 0.015 | 0.006 |
| Average extraction time | 100 | 55 |
Embodiment 3
Adopt intensified uranium ore heap leaching method of the present invention, head grade is carried out dump leaching at 0.196% third ore, its concrete steps are as follows:
(1) builds heap with being transported into the dump leaching field after the uranium ore fragmentation earlier;
(2) ore deposit heap spray leaching agent (sulfuric acid) is leached, the initial stage is adopted high spraying intensity spray leaching agent, and spraying intensity is greater than 30L/m
2H leaches as early as possible so that wait to soak uranium metal, reduces spraying intensity later on gradually, and the leaching yield that leaches uranium metal after 55 days reaches 80%, stops to spray leaching agent;
(3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water can be added leaching agent or the ripening agent that returns behind the sulfuric acid again as next heap;
The accurate tailings of step (2) gained was dried in the air heap after 7 days, the ripening agent of 0.1 times of accurate tailings weight of spray carries out slaking, ripening agent is the sulfuric acid of acid concentration 400g/L, slaking is aimed at tailings and is drenched and soak after 10 days, adopted eluent be earlier above-mentioned adsorption tail liquid or raffinate water, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than 100mg/L after, adopt the water wash heap again, accurate tailings leach liquor after the slaking of gained and slag washing water return again as the next leaching agent of piling.
Intensified uranium ore heap leaching method of the present invention compared with prior art can reduce cinder grade, shorten extraction time, and is specifically as shown in table 3.
Table 3 adopts existing leaching method and the inventive method to leach the third ore result
| Existing dump leaching method | Dump leaching method of the present invention | |
| The ore reduction granularity (mm) | -8 | -8 |
| Leaching agent spraying intensity (L/m 2h) | Less than 20 | Greater than 30 |
| The uranium leaching yield reach 80% required time (my god) | 80 | 55 |
| From leaching yield 80% to leaching end required time (my god) | 70 | 20 |
| Tailings grade (%) | 0.021 | 0.011 |
| Average extraction time | 150 | 82 |
Embodiment 4
As shown in Figure 3, adopt intensified uranium ore heap leaching method of the present invention, head grade is carried out dump leaching at 0.196% the third ores, its concrete steps are as follows:
(1) builds heap with being transported into the dump leaching field after the uranium ore fragmentation earlier;
(2) ore deposit heap spray leaching agent (sulfuric acid) is leached, the initial stage is adopted high spraying intensity spray leaching agent, and spraying intensity is greater than 30L/m
2H leaches as early as possible so that wait to soak uranium metal, reduces spraying intensity later on gradually, and the leaching yield that leaches uranium metal after 55 days reaches 80%, stops to spray leaching agent;
(3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water can be added the leaching agent that returns behind the sulfuric acid again as next heap;
The accurate tailings of step (2) gained was dried in the air heap after 7 days, the ripening agent of 0.08 times of accurate tailings weight of spray carries out a slaking, ripening agent is the sulfuric acid of acid concentration 300g/L, a slaking is used leach liquor and the slag washing water of a heap behind the post cure again and is drenched and soak after 10 days, the leach liquor of a slaking gained returns the leaching agent as next heap; When leach liquor metal concentration during less than 200mg/L, stop spray, the heap that dries in the air carried out post cure after 5 days, the ripening agent of 0.12 times of accurate tailings weight of spray, ripening agent is the sulfuric acid of acid concentration 400g/L, post cure drenches after 10 days and soaks, adopted eluent be earlier above-mentioned adsorption tail liquid or raffinate water, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than 100mg/L after, adopt the water wash heap again, leach liquor behind the post cure of last gained and slag washing water return as the ripening agent of a slaking of the next heap of preparation with as the accurate tailings eluent after the slaking of next heap.
Intensified uranium ore heap leaching method of the present invention compared with prior art can reduce cinder grade, shorten extraction time, and is specifically as shown in table 4.
Table 4 adopts existing leaching method and the inventive method to leach the third ore result
| Existing dump leaching method | Dump leaching method of the present invention | |
| The ore reduction granularity (mm) | -8 | -8 |
| Leaching agent spraying intensity (L/m 2h) | Less than 20 | Greater than 30 |
| The uranium leaching yield reach 80% required time (my god) | 80 | 55 |
| From leaching yield 80% to leaching end required time (my god) | 70 | 40 |
| Tailings grade (%) | 0.021 | 0.008 |
| Average extraction time | 150 | 102 |
The inventive method can be carried out the slaking of secondary (or repeatedly) peracid spray for refractory mineral.The acid concentration of ripening agent is relevant with ore character, needs to be determined by test, and general ripening agent acid concentration is at 200～500g/L.The acid concentration of raising ripening agent can reduce cinder grade, but sour consumption increase, impurity increases in the leach liquor, and the acid solution of excessive concentrations all has certain degree of difficulty in preparation, conveying, and how high the selection of ripening agent acid concentration is actually, and relatively the back is definite can to pass through economic technology.Curing time is relevant with the acid concentration of ore character and ripening agent, needs to be determined by test, and the general curing time was at 4～15 days.Ripening agent acid concentration height, the curing time is suitable a little longer.Adopt the slaking of secondary (or repeatedly) peracid spray, can reduce the tailings grade, but extraction time prolongs, the acid consumption increases, and whether adopt can relatively the back be definite through Technological Economy.Water ratio when accurate tailings peracid sprays slaking has remarkably influenced to the slaking effect.Water in the accurate tailings can reduce the acid concentration of ripening agent, makes the slaking deleterious, therefore, when conditions permit, should as far as possible the ore deposit heap be dried, and reduces the water ratio of accurate tailings, and general accurate tailings dries in the air and piled 3～7 days.
In conjunction with the accompanying drawings embodiments of the invention have been done detailed description above, but the present invention is not limited to the foregoing description, in the ken that those of ordinary skills possessed, also can under the prerequisite that does not break away from aim of the present invention, makes various variations.
Claims (7)
1. intensified uranium ore heap leaching method, it comprises the steps:
(1) builds heap with being transported into the dump leaching field after the uranium ore fragmentation earlier;
(2) ore deposit heap spray leaching agent is leached;
(3) step (2) gained leach liquor is adsorbed or extract, the saturated resin or the saturated organic phase of containing metal uranium enter postprocessing working procedures, and adsorption tail liquid or raffinate water are added the leaching agent that returns after the acid again as next heap;
It is characterized in that:
Leach the initial stage at step (2) spray leaching agent, adopt high spraying intensity spray leaching agent, the spraying intensity of leaching agent is greater than 30L/m
2H, leach as early as possible so that wait to soak uranium metal, reduce spraying intensity later on gradually, after the leaching yield of uranium metal reaches 70～80%, stop to spray leaching agent, the accurate tailings of gained is dried in the air heap after a couple of days, ripening agent with 0.08～0.12 times of accurate tailings weight carries out slaking, slaking is aimed at tailings again and is drenched and soak after a couple of days, drench the leach liquor that soaks gained and return leaching agent as next heap, in the tailings and after enter the tailings storehouse; Described leaching agent is a sulfuric acid, and described ripening agent is the sulfuric acid of 100～500g/L.
2. a kind of intensified uranium ore heap leaching method according to claim 1, it is characterized in that: described slaking is aimed at tailings again and is drenched and soak after a couple of days, adsorption tail liquid or raffinate water that the leacheate that it adopted produces for step (3) earlier, and drench the initial stage of soaking with high spraying intensity drip washing to the leach liquor uranium metal concentration less than certain value after, adopt the water wash heap again, leach liquor after the slaking of gained and slag washing water return again as the next leaching agent of piling.
3. a kind of intensified uranium ore heap leaching method according to claim 1 is characterized in that: for refractory mineral, carry out the above slaking of secondary, promptly repeat secondary above ripening agent slaking a couple of days with 0.08～0.12 times of accurate tailings weight.
4. a kind of intensified uranium ore heap leaching method according to claim 1 is characterized in that: for refractory mineral, carry out the above slaking of secondary, promptly carry out secondary above ripening agent slaking a couple of days with 0.08～0.12 times of accurate tailings weight; When the slaking carried out more than the secondary, the acid concentration of the ripening agent that the acid concentration value of the ripening agent that adopts during the n time slaking adopts during greater than the n-1 time slaking, the gained leach liquor returns and adds the ripening agent of acid as the n-1 time slaking of next heap after the n time slaking, or makes the eluent of the accurate tailings after the n-1 time slaking of next heap.
5. according to described any one intensified uranium ore heap leaching method of claim 1 to 4, it is characterized in that: ripening agent slaking a couple of days of 0.08～0.12 times of accurate tailings weight of described usefulness, the adding method of its ripening agent is a spraying method, and the ripening agent acid concentration is at 100～500g/L.
6. according to described any one intensified uranium ore heap leaching method of claim 1 to 4, it is characterized in that: the time of described usefulness ripening agent slaking was at 4～15 days.
7. according to described any one intensified uranium ore heap leaching method of claim 1 to 4, it is characterized in that: described aligning tailings dry in the air the heap time at 3～7 days.
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| CN102021330B (en) * | 2010-12-23 | 2012-06-27 | 核工业北京化工冶金研究院 | Leaching method capable of reducing leached acid consumption of uranium ores |
| CN102134651B (en) * | 2011-04-15 | 2012-07-25 | 广西地博矿业集团股份有限公司 | Heap leaching drainage system for large-scale production of low-grade gold oxide ores |
| 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 |
| 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 |
| CN111349789B (en) * | 2020-04-24 | 2021-08-17 | 核工业北京化工冶金研究院 | Method for purifying caustic sludge leachate uranium with multi-outlet design |
| 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 |
| CN113151700B (en) * | 2021-04-30 | 2022-04-22 | 中广核铀业发展有限公司 | High-heap leaching method for uranium ore |
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