CN115711127A - Large-dip-angle sandstone-type uranium ore body ground leaching mining method - Google Patents
Large-dip-angle sandstone-type uranium ore body ground leaching mining method Download PDFInfo
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- CN115711127A CN115711127A CN202110964181.XA CN202110964181A CN115711127A CN 115711127 A CN115711127 A CN 115711127A CN 202110964181 A CN202110964181 A CN 202110964181A CN 115711127 A CN115711127 A CN 115711127A
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Abstract
A ground leaching mining method suitable for large-dip-angle sandstone-type uranium ore bodies comprises the following steps of 1: injecting the leaching agent into the ground; step 2: designing a well type suitable for in-situ leaching exploitation of the large-dip-angle ore body; on the basis of a square with a regular geometric shape, a liquid injection well A1 is arranged, and a liquid pumping well 3 is arranged in the middle; adding a liquid injection well B2 along the direction of the trend of the ore body; and step 3: installing a single-well filter into the liquid injection well 1 and the liquid extraction well 3; and 4, step 4: keeping the maximum injection amount of the injection well 2; and 5: and (3) controlling the leaching agent filling parameters in the step 1.
Description
Technical Field
The invention belongs to a mining method of uranium resources, and particularly relates to a mining technical method of locally-leachable sandstone type large-dip-angle uranium resources in the field of uranium ore mining and metallurgy.
Background
The in-situ leaching uranium mining technology is the main mining mode of the domestic natural uranium production at present and forms a' CO 2 +O 2 The third generation natural uranium mining technology system represented by the in-situ leaching uranium mining technology.
According to the theory of in-situ leaching uranium mining technology, the in-situ leaching uranium mining technology generally requires that the ore body is in a horizontal layer shape or a gently inclined ore body with an inclination angle smaller than 10 degrees, the horizontal continuity of the ore body is good, the transverse width is large, and the arrangement of a pumping and injecting liquid well is convenient under the condition, so that the leaching agent effectively flows at the ore position in an ore-containing aquifer, the pumping and injecting balance is favorably realized, and the effective leaching of the ore body is realized. The above aims can be achieved by adopting the conventional in-situ leaching mining technology, for example, the drilling arrangement of the wellsite in-situ leaching process generally adopts well-type arrangement modes such as regular hexagon, regular pentagon and the like with regular geometric shapes, so that the pumping and injection balance in the leaching process can be realized.
For the ore body capable of leaching sandstone with a large inclination angle (the inclination angle of the ore body is generally more than 20 degrees), due to the large change of the occurrence space position of the ore body, the key technical problems still exist in the aspects of realizing the uniform flow of the leaching agent at the position of the ore layer in the ore-containing aquifer, realizing the effective leaching of the target ore layer to obtain a high leaching solution uranium concentration, reasonably controlling the balance of the pumping and injecting liquid amount and the like.
In order to solve the problems, the higher uranium concentration (more than 30 mg/L) of the leachate is obtained, the effective leaching exploitation of the sandstone-type uranium resources with large inclination angles is realized, and the recycling of the uranium resources is further improved. Combining with actual mining experience, the method especially provides a technical method suitable for the leaching mining of the sandstone-type uranium ore body with a large inclination angle.
Disclosure of Invention
The invention aims to: the technical method is suitable for the ground leaching exploitation of the sandstone-type uranium ore body with the large dip angle, and the effective leaching of the sandstone-type uranium ore body with the large dip angle is realized by adopting the technologies of designing and optimizing well site well pattern arrangement, determining economic and effective well pattern intervals, optimizing single well design and the like.
The technical scheme of the invention is as follows: a method suitable for the ground leaching exploitation of a sandstone-type uranium ore body with a large inclination angle,
step 1: injecting the leaching agent into the ground;
step 2: designing a well type suitable for in-situ leaching exploitation of the ore body with a large inclination angle; on the basis of a square with a regular geometric shape, a liquid injection well A1 is arranged, and a liquid pumping well 3 is arranged in the middle; adding a liquid injection well B2 along the trend direction of the ore body;
and step 3: installing a single-well filter into the liquid injection well 1 and the liquid extraction well 3;
and 4, step 4: keeping the maximum injection amount of the injection well 2;
and 5: and (4) controlling the leaching agent filling parameters in the step 1.
In the step 1, CO is adopted 2 And O 2 Preparing a leaching agent; the lixiviant is injected into the ground.
CO regulation 2 Controlling the pH value of the underground water to be 6-8 by the concentration.
In the step 2, the liquid injection well B2, the liquid pumping well 3 and the liquid injection well A1 are positioned on the same plane.
In the step 2, the distance between the liquid injection well A1 and the liquid injection well B2 is 30m, the distance between the liquid injection well B2 and the liquid pumping well 3 is 30m, and the distance between the liquid injection well A1 and the liquid pumping well 3 is 42.4m.
In the step 2, the ratio of the sum of the injection wells A1 and B2 to the number of the liquid pumping wells 3 is controlled to be 2.6.
In the step 3, the connecting line between the single-well filters respectively arranged in the liquid injection well 1 and the liquid extraction well 3 is ensured to form an included angle of less than 5 degrees with the trend of the ore body.
In the step 4, the maximum injection amount of the injection well 2 is maintained at a pressure of 1.6 MPa.
In the step 4, the injection quantities of the injection well 2 and the rest surrounding injection wells are adjusted, so that the ratio of the injection quantities of the two injection wells is controlled to be 1.2-1.5.
In the step 5, the standard of oxygen concentration is controlled to be 450mg/L, and the standard of carbon dioxide filling concentration is controlled to be 100mg/L.
The invention has the following remarkable effects: by designing the novel well type arrangement, the problem of the ground leaching extraction-injection balance of the large-dip-angle ore body is solved, the uranium ore body is effectively leached by reasonably designing the single-well filter, effectively adjusting the leaching extraction-injection ratio and the leaching agent injection parameters, and the ground leaching exploitation of the large-dip-angle sandstone-type uranium ore body is realized.
Drawings
FIG. 1 is a schematic diagram of a process for extracting uranium ore body suitable for large dip sandstone;
in the figure: liquid injection well A1, liquid injection well B2 and liquid extraction well 3
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The method for mining the sandstone-type uranium ore body suitable for large inclination angle in the concrete mining example of the large inclination angle ore body of the uranium ore deposit in the money II block of the money store is further described in the following:
step 1: according to the ore type of the large-dip-angle sandstone ore body of the uranium deposit in money II of the Qian store, CO is adopted 2 And O 2 Used as a leaching agent. Injecting the leaching agent into the ground and regulating CO 2 Controlling the pH value of the underground water to be 6-8 by the concentration.
Step 2: the design is suitable for the ground leaching exploitation well type of the ore body with large inclination angle. On the basis of a square with a regular geometric shape, the periphery of the square is provided with a liquid injection well A1, and the middle of the square is provided with a liquid pumping well 3. And a liquid injection well B2 is additionally arranged along the trend direction of the ore body and is positioned on the same plane as the liquid extraction well 3 and the liquid injection well A1.
The distance between the liquid injection well A1 and the liquid injection well B2 is 30m, the distance between the liquid injection well B2 and the liquid extraction well 3 is 30m, and the distance between the liquid injection well A1 and the liquid extraction well 3 is 42.4m. Under the whole complete well type condition, the ratio of the number of the sum of the liquid injection wells A1 and the liquid injection wells B2 to the number of the liquid extraction wells 3 is controlled to be 2.6.
And step 3: a design method for the position of a single-well filter of an ore body with a large inclination angle.
Installing single-well filters into the liquid injection well 1 and the liquid extraction well 3, and ensuring that a connecting line between the single-well filters respectively installed in the liquid injection well 1 and the liquid extraction well 3 and the trend of an ore body form an included angle of less than 5 DEG
And 4, step 4: and controlling the pumping ratio method. The maximum injection amount of the injection well 2 is kept to be increased along the trend of the ore body under the pressure of 1.6MPa, and the injection amounts of the other injection wells around the injection well 2 are adjusted to control the ratio of the injection amounts of the two injection wells to be 1.2-1.5.
And 5: and (3) controlling the leaching agent filling parameters in the step 1. The standard of oxygen concentration is controlled to be 450mg/L, and the standard of carbon dioxide filling concentration is controlled to be 100mg/L. And the filling parameters are properly adjusted according to the leaching operation in the later stage.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A large dip angle sandstone type uranium ore body ground leaching mining method is characterized by comprising the following steps:
step 1: injecting the leaching agent into the ground;
step 2: designing a well type suitable for in-situ leaching exploitation of the large-dip-angle ore body; on the basis of a square with a regular geometric shape, arranging a liquid injection well A (1) and a liquid pumping well (3) in the middle; adding a liquid well B (2) along the direction of the ore body;
and step 3: installing a single-well filter into the liquid injection well (1) and the liquid extraction well (3);
and 4, step 4: the maximum liquid injection amount of the liquid injection well (2) is kept;
and 5: and (3) controlling the leaching agent filling parameters in the step 1.
2. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 1, wherein the method comprises the following steps: in the step 1, CO is adopted 2 And O 2 Preparing a leaching agent; the lixiviant is injected into the ground.
3. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 2, wherein the method comprises the following steps: CO regulation 2 Controlling the pH value of the underground water to be 6-8 by the concentration.
4. The method for extracting the sandstone-type uranium ore body from the ground according to claim 1, wherein the method comprises the following steps: in the step 2, the liquid injection well B (2), the liquid extraction well (3) and the liquid injection well A (1) are positioned on the same plane.
5. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 4, wherein the method comprises the following steps: in the step 2, the distance between the liquid injection well A (1) and the liquid injection well B (2) is 30m, the distance between the liquid injection well B (2) and the liquid extraction well (3) is 30m, and the distance between the liquid injection well A (1) and the liquid extraction well (3) is 42.4m.
6. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 5, wherein the method comprises the following steps: in the step 2, the ratio of the sum of the injection wells A (1) and B (2) to the number of the liquid pumping wells (3) is controlled to be 2.6.
7. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 1, wherein the method comprises the following steps: in the step 3, the connecting line between the single-well filters respectively installed in the liquid injection well (1) and the liquid extraction well (3) is ensured to form an included angle of less than 5 degrees with the trend of the ore body.
8. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 1, wherein the method comprises the following steps: in the step 4, the maximum injection amount of the injection well (2) is kept at the pressure of 1.6 MPa.
9. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 8, wherein the method comprises the following steps: in the step 4, the injection quantities of the injection well (2) and the rest surrounding injection wells are adjusted, so that the ratio of the injection quantities of the two injection wells is controlled to be 1.2-1.5.
10. The method for extracting uranium ore body from high-dip-angle sandstone according to claim 1, wherein the method comprises the following steps: in the step 5, the oxygen concentration standard is controlled to be 450mg/L, and the carbon dioxide filling concentration standard is controlled to be 100mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116607928A (en) * | 2023-06-30 | 2023-08-18 | 核工业北京化工冶金研究院 | Well pattern optimization method for in-situ leaching exploitation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116607928A (en) * | 2023-06-30 | 2023-08-18 | 核工业北京化工冶金研究院 | Well pattern optimization method for in-situ leaching exploitation |
| CN116607928B (en) * | 2023-06-30 | 2023-10-20 | 核工业北京化工冶金研究院 | Well pattern optimization method for in-situ leaching exploitation |
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