CN114183118B - Enhanced-permeability in-situ leaching mining method and device for hyposmosis sandstone uranium ores and terminal equipment - Google Patents
Enhanced-permeability in-situ leaching mining method and device for hyposmosis sandstone uranium ores and terminal equipment Download PDFInfo
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- 238000002386 leaching Methods 0.000 title claims abstract description 178
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 109
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 74
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 42
- 238000005065 mining Methods 0.000 title claims abstract description 35
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 305
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 156
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 141
- 239000007788 liquid Substances 0.000 claims abstract description 101
- 238000005422 blasting Methods 0.000 claims abstract description 94
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 239000000243 solution Substances 0.000 claims abstract description 37
- 238000005086 pumping Methods 0.000 claims abstract description 36
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000009854 hydrometallurgy Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 30
- 239000001301 oxygen Substances 0.000 claims description 30
- 229910052760 oxygen Inorganic materials 0.000 claims description 30
- 238000000605 extraction Methods 0.000 claims description 27
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- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 22
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- 238000000926 separation method Methods 0.000 claims description 11
- 230000006870 function Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005342 ion exchange Methods 0.000 claims description 6
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- 238000004140 cleaning Methods 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 20
- 238000012544 monitoring process Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 239000012633 leachable Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
- E21B43/283—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent in association with a fracturing process
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2607—Surface equipment specially adapted for fracturing operations
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- Mining & Mineral Resources (AREA)
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Abstract
The invention is applicable to the technical field of uranium mining, and provides a method, a device and terminal equipment for enhanced leaching and mining of hyposmosis sandstone uranium, wherein the method comprises the following steps: placing a carbon dioxide circulating blasting device at the inlet end of the horizontal well, and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on the target ore deposit; controlling the horizontal well to be opened, reversely discharging and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit; controlling a leaching agent injection subsystem to inject a leaching agent into the target ore layer; and controlling a liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pumping well, and extracting uranium from the leaching solution based on a uranium ore hydrometallurgy process. The permeability-increasing in-situ leaching exploitation method of the low-permeability sandstone uranium deposit can effectively realize the large-scale fracturing of the deposit, form a smooth three-dimensional fracture network, and improve the overall permeability of the deposit, thereby improving the exploitation efficiency of the uranium deposit.
Description
Technical Field
The invention belongs to the technical field of uranium mining, and particularly relates to a permeability-enhanced in-situ leaching mining method and device for low-permeability sandstone uranium ores and terminal equipment.
Background
Sandstone uranium ores are one of the main natural uranium resource types, and common mining methods employ in-situ leaching processes. The main processes of the in-situ leaching process include: injecting the prepared leaching solution into a natural uranium-bearing ore layer through a liquid injection hole drill; uranium in the ore layer is dissolved through chemical reaction to form uranium-containing solution, and the uranium-containing solution is lifted to the surface through liquid pumping and drilling; and finally carrying out hydrometallurgical treatment to obtain the required uranium concentrate product. The method can integrate mining and smelting, and has obvious environmental protection advantage. The development of in-situ leaching technology, including acid and alkali processes, has also been practiced industrially by the third generation of carbon dioxide plus oxygen neutral in-situ leaching technology.
In actual production, the permeability of the uranium deposit itself is a fundamental requirement and key control factor for in-situ leaching exploitation. For widely existing low permeability sandstone uranium ores (permeability coefficient <0.1 m/d), there are outstanding contradictions of difficult injection, difficult extraction, low recovery rate and high cost. Conventionally, in order to mine hypotonic sandstone uranium ores, an enhanced permeability treatment may be performed by way of explosive blasting. However, the method has the defects of difficult control of shock wave pressure, poor repeatability, easy collapse of holes, rapid permeability attenuation and the like, and is not suitable for physical modification of deep hypotonic sandstone uranium ore layers.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method, a device and a terminal device for enhanced leaching exploitation of low-permeability sandstone uranium ores, which can improve the overall permeability of the low-permeability sandstone uranium ore layers, so that the uranium ore exploitation efficiency is improved.
A first aspect of an embodiment of the present invention provides a method for enhanced leaching mining of hypotonic sandstone uranium ores, including:
placing a carbon dioxide circulating blasting device at the inlet end of a horizontal well, and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on a target ore deposit;
Controlling the horizontal well to be opened, reversely discharging and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit;
Controlling a leaching agent injection subsystem to inject a leaching agent into the target ore layer;
And controlling a liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pumping well, and extracting uranium from the leaching solution based on a uranium ore hydrometallurgy process.
A second aspect of an embodiment of the present invention provides a hypotonic sandstone uranium deposit enhanced in-situ leaching mining device, including:
The blasting control module is used for placing the carbon dioxide circulating blasting device at the inlet end of the horizontal well and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on the target ore deposit;
The back-drainage control module is used for controlling the horizontal well to be opened, back-draining and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit;
The leaching agent injection control module is used for controlling the leaching agent injection subsystem to inject the leaching agent into the target ore layer;
And the liquid extraction control module is used for controlling a liquid extraction pump to extract the gas-liquid mixture after leaching reaction to the surface through a liquid extraction well, and extracting uranium from leaching liquid based on a uranium mining hydrometallurgy process.
A third aspect of the embodiments of the present invention provides a terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method as described above when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above.
A fifth aspect of the embodiments of the present invention provides a computer program product for causing an electronic device to carry out the steps of the method according to any one of the first aspects described above when the computer program product is run on a terminal device.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the embodiment of the invention provides a permeability-increasing on-site leaching exploitation method of a hypotonic sandstone uranium deposit, which comprises the steps of placing a carbon dioxide circulating blasting device at the inlet end of a horizontal well, and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on a target ore deposit; controlling the horizontal well to be opened, reversely discharging and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit; controlling a leaching agent injection subsystem to inject a leaching agent into the target ore layer; and controlling a liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pumping well, and extracting uranium from the leaching solution based on a uranium ore hydrometallurgy process. The permeability-increasing in-situ leaching exploitation method of the hypotonic sandstone uranium deposit provided by the embodiment of the invention can effectively realize large-scale fracturing of the ore deposit, form a smooth three-dimensional fracture network, and improve the overall permeability of the ore deposit, thereby improving the uranium deposit exploitation efficiency
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a system structure of an application of an enhanced in-situ leaching mining method for hypotonic sandstone uranium ores provided by an embodiment of the present invention;
Fig. 2 is a schematic diagram of a system for applying the enhanced in-situ leaching mining method of hypotonic sandstone uranium ores according to an embodiment of the present invention;
fig. 3 is a schematic implementation flow chart of an enhanced in-situ leaching mining method for hypotonic sandstone uranium ores provided by an embodiment of the present invention;
Fig. 4 is a schematic diagram of an enhanced in-situ leaching mining device for hypotonic sandstone uranium ores provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The carbon dioxide blasting permeation increasing technology has the characteristics of high safety, circularly and repeatedly blasting, uniform blasting crack distribution and capability of remarkably improving the overall permeability. However, the existing carbon dioxide blasting permeability-increasing technology is generally used for underground roadway blasting, and the requirements of in-situ reservoir reformation and efficient leaching of deep sandstone uranium ores are difficult to meet.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
The method for enhanced leaching and exploitation of the hypotonic sandstone uranium deposit provided by the embodiment of the invention is applied to well groups of a horizontal well and a vertical well arranged in the hypotonic sandstone uranium deposit, and is based on a carbon dioxide blasting enhanced leaching and carbon dioxide oxygen adding enhanced leaching and exploitation system. The on-site leaching reinforcement development system can comprise a horizontal well drilling subsystem, a carbon dioxide blasting subsystem, a carbon dioxide and oxygen leaching agent injection subsystem, a liquid pumping subsystem, a gas-liquid separation and hydrometallurgy processing subsystem and a monitoring control subsystem.
Fig. 1 shows an application scenario of the enhanced leaching mining method of the hypotonic sandstone uranium deposit provided by the embodiment of the present invention.
Referring to fig. 1, the carbon dioxide explosion permeability-increasing and carbon dioxide and oxygen-adding in-situ leaching strengthening development system provided by the embodiment of the invention can comprise a drilling tower 1, a carbon dioxide and oxygen leaching agent injection subsystem 2, a beam type liquid extractor 3, a gas-liquid separation and hydrometallurgy treatment subsystem 4, a horizontal well deflecting section 5, a horizontal well 6, a liquid extraction well 7, a carbon dioxide explosion device 8, an explosion fracture zone 9 and a monitoring control subsystem 10.
Specifically, the carbon dioxide and oxygen in-situ leaching enhancement development system 2 can comprise a high-pressure pulse air pump 2-1 and an oxygen/carbon dioxide air storage tank 2-2.
The high-pressure pulse air pump 2-1 can pressurize the air and then pulse the air to the target seam according to a certain frequency, thereby improving the injection rate of the air and achieving the effect of dredging the seepage channel. Specifically, the high-pressure pulse air pump can increase the air pressure to 50MPa at most.
The oxygen/carbon dioxide gas tank 2-2 may supply a single component gas or a gas mixed in an arbitrary ratio.
Fig. 2 shows a schematic structural diagram of a carbon dioxide blasting device 8 in the enhanced leaching mining method of the hypotonic sandstone uranium deposit according to an embodiment of the present invention.
Referring to fig. 2, a carbon dioxide blasting apparatus 8 provided in an embodiment of the present invention may include: the device comprises a pushing device 8-1, a rock breaking device 8-5, a plugging device 8-8, a detonation tube 8-14 and an energy release tube 8-17.
Wherein, pusher 8-1 includes movable arm 8-2, transmission 8-3, first connector 8-4. The movable arms 8-2 are distributed around the carbon dioxide blasting device 8 at equal intervals, and the number of the movable arms is 8-12. The movable arm 8-2 is closely attached to the surface of the rock wall of the horizontal well, and the transmission device drives the movable arm 8-2 to move left and right, so that the carbon dioxide blasting device 8 can move freely in the horizontal well.
The rock breaking device 8-5 comprises a rock breaking tool 8-6 and a second connection head 8-7. The rock breaking tool 8-6 has several groups which can be extended and retracted under the action of gas pressure. When the rock breaking cutter 8-6 stretches out, the cutter head rotates to drive the rock breaking cutter 8-6 to cut the collapse surrounding rock so as to keep the well diameter of the horizontal well unchanged.
The plugging device 8-8 comprises a packer 8-9 and a third joint 8-10. The packer 8-9 extends out of the carbon dioxide blasting device 8 under the action of air pressure so as to fill a gap between the carbon dioxide blasting device 8 and surrounding rock and is tightly cut on the wall of the horizontal well, so that a closed space is formed between the left plugging device 8-8 and the right plugging device 8-8. The sealing space formed by the plugging devices 8-8 can promote more damage cracks after carbon dioxide blasting, and the distribution range is wider, so that the effect of blasting modification of the ore deposit is improved.
The liquid storage pipe 8-11 comprises a fourth connector 8-13, and liquid carbon dioxide 8-12 is stored in the liquid storage pipe 8-11.
The detonating tube 8-14 comprises a heating rod 8-15 and a constant pressure shear slice 8-16. The heating rods 8-15 have the function of instantaneously and rapidly heating, so that the temperature of the liquid carbon dioxide can be rapidly increased in a short time and converted into gas. When the pressure of the carbon dioxide exceeds the threshold value of the constant pressure shear blade 8-16, the carbon dioxide gas in the detonating tube 8-14 is discharged to the energy release tube 8-17 at a high speed.
The energy release pipes 8-17 are provided with a plurality of energy release holes, and high-pressure carbon dioxide gas is sprayed out of the energy release holes and acts on the mineral seam to cause a large number of damage cracks in the mineral seam.
In some embodiments, the carbon dioxide blasting subsystem is used for realizing blasting permeability-increasing reservoir transformation of the horizontal well section, and a three-dimensional complex fracture network can be formed in the mineral seam, so that the overall permeability of the mineral seam is improved.
In an embodiment of the invention, the carbon dioxide blasting subsystem comprises a liquid carbon dioxide injection device and an 8 carbon dioxide blasting device. Wherein, the liquid carbon dioxide injection device can be a2 carbon dioxide plus oxygen leaching agent injection subsystem, and no other arrangement is needed.
The horizontal well drilling subsystem in embodiments of the present invention may include a rig, stabilizer, drill collar, drill pipe, joint, and the like. Wherein the 1-rig is used for placing and suspending a lifting system, bearing the weight of a drilling tool, and storing drill rods and drill collars. The horizontal well section adopts an open hole completion mode, and the position of the horizontal well section is distributed at the middle part of the mineral water-bearing layer.
The carbon dioxide and oxygen leaching agent injection subsystem realizes pulse injection of the leaching agent with optimal proportion, and can improve the carbon dioxide and oxygen in-situ leaching effect of the modified ore deposit.
And the liquid extraction subsystem extracts the gas-liquid mixture in the ore layer after leaching reaction through the liquid extraction well and lifts the mixture to the surface. In some embodiments, the liquid pumping subsystem comprises a beam type liquid pumping machine 3 and liquid pumping wells 7, the liquid pumping wells 7 are vertical shafts, and the liquid pumping wells 7 can be arranged at two sides of the horizontal well 6 according to a certain interval to form a group of injection and pumping wells of the horizontal well plus the vertical shaft. The injection and extraction well group and the blasting crack network form a leaching solution leaching network. The liquid pumping well 7 can pump the gas-liquid mixture after leaching, and the pumping ratio is adjusted by controlling the liquid pumping amount.
Specifically, the distance between each of the liquid extraction wells 7 and the horizontal well 6 is 30 meters to 50 meters.
The gas-liquid separation and hydrometallurgy treatment subsystem 4 can comprise a 4-1 gas-liquid separation device, a 4-2 gas recovery tank and a 4-3 sedimentation tank. The gas-liquid separation and hydrometallurgy processing subsystem 4 is used for separating and collecting the gas-liquid mixture, and extracting uranium from leaching solution in the sedimentation tank through ion exchange, solvent extraction, sedimentation and other uranium ore hydrometallurgy processes. In some embodiments, the inlet of the gas-liquid separation device 4-1 is connected to the liquid extraction well 7, and the outlet is connected to the gas recovery tank 4-2 and the sedimentation tank 4-3, so as to perform pretreatment and gas-liquid separation on the extracted gas-liquid mixture. The separated gas is stored in a gas recovery tank 4-2, and the leaching solution is discharged into a sedimentation tank 4-3. Uranium in the leaching solution is recovered through uranium ore hydrometallurgy processes such as ion exchange, solvent extraction, precipitation and the like.
The monitoring control subsystem can dynamically monitor the leaching solution seepage range, the mineral seam permeability and the uranium resource recovery rate, and the parameters such as carbon dioxide blasting parameters, leaching solution injection parameters, pressure, flow, PH, ion concentration, uranium resource recovery rate and the like in the on-site leaching process are displayed and recorded in real time through the drilling and geophysical prospecting system, so that the low-permeability sandstone uranium mining process is interfered and managed, and the high-yield and high-efficiency mining of the low-permeability sandstone uranium mine is realized. Specifically, the monitoring control subsystem can integrate a field workstation, a sensor, a data acquisition processing system and a central service control system into a whole to form a digital, intelligent, visual and convenient monitoring and control system, so as to realize the display, acquisition and analysis of engineering data.
Fig. 3 shows a schematic implementation flow chart of an enhanced leaching mining method of a hypotonic sandstone uranium deposit according to an embodiment of the present invention. Referring to fig. 3, the enhanced in-situ leaching mining method of hypotonic sandstone uranium ores provided by an embodiment of the present invention may include steps S101 to S104.
In some embodiments, the enhanced leaching mining method for the hypotonic sandstone uranium ores provided by the embodiment of the invention is applied to a monitoring control system.
S101: and placing the carbon dioxide circulating blasting device at the inlet end of the horizontal well, and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on the target ore deposit.
In some embodiments, prior to S101, the method may further include: arranging the equipment in each subsystem for the development of the carbon dioxide explosion permeability increase and carbon dioxide and oxygen in-situ leaching reinforcement of the low-permeability sandstone uranium ores on the ground, and connecting and debugging.
In some embodiments, prior to S101, the method may further include: the horizontal well drilling system is controlled to prepare a horizontal well deflecting section 5, a horizontal well 6 and a liquid pumping well 7 so that the horizontal well and the liquid pumping well are positioned in the middle of the mineral-bearing aquifer. And connecting the horizontal well deflecting section 5, the horizontal well 6 and the liquid pumping well 7 in the target sandstone layer to complete the open hole completion of the horizontal well. And (3) lifting the horizontal well drilling system.
In some embodiments, the carbon dioxide cycle blasting apparatus 8 includes a plugging apparatus 8-8, a detonating tube 8-14, a rock breaking apparatus 8-5, and a pushing apparatus 8-2.
In some embodiments S101 comprises: and controlling the plugging device 8-8 and the detonating tube 8-14 to operate, and blasting the current well section of the horizontal well. The rock breaking device 8-5 is controlled to operate to clean the broken rock of the well bore in the current well section. The pushing device 8-2 is controlled to operate, so that the carbon dioxide circulating blasting device 8 is pushed to the next well section in the horizontal well. The circulation execution controls the plugging device 8-8 and the detonating tube 8-14 to operate, controls the rock breaking device 8-5 to operate and controls the pushing device 8-2 to operate until the circulation blasting fracturing of the horizontal well is completed.
The horizontal well section blasting mode provided by the embodiment of the invention adopts a mode of sectional blasting and repeated blasting to finish and reform the carbon dioxide blasting fracturing procedure in the horizontal well section, thereby forming a three-dimensional fracture network structure.
Compared with the traditional reservoir transformation modes such as hydraulic fracturing, the low-permeability sandstone uranium deposit permeability-increasing on-site leaching exploitation method can effectively realize the large-scale fracturing of a mineral layer, form a smooth three-dimensional fracture network and remarkably improve the overall permeability of the mineral layer. After the carbon dioxide blasting is reformed, complex ore layer fracture networks and gaps jointly form leaching solution migration channels and geochemical reaction sites, and guarantee is provided for efficient reservoir reformation of the low-permeability sandstone uranium ore layer.
S102: and controlling the horizontal well to be opened, reversely discharging and collecting the carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit.
In some embodiments, the specific implementation procedure of S102 includes: and opening the horizontal well, and reversely discharging the high-pressure carbon dioxide gas left in the ore deposit after the carbon dioxide blasting to the ground in a mode of gradually reducing the pressure of the reservoir in the ore deposit until the pressure of the carbon dioxide in the ore deposit is equal to the water pressure of the ore deposit.
According to the permeability-increasing on-site leaching exploitation method for the hyposmosis sandstone uranium ores, provided by the embodiment of the invention, the fracture network of the ore layer can be further dredged by reversely exhausting high-pressure carbon dioxide gas left in the ore layer after carbon dioxide blasting, the air lock effect of the leaching solution on seepage in the modified ore layer is weakened, carbon dioxide, oxygen and ore layer water are enabled to synchronously contact with the ore layer, and the efficient leaching of the uranium leaching solution is ensured by carbon dioxide and oxygen on-site leaching.
S103: controlling the leaching agent injection subsystem to inject the leaching agent into the target ore layer.
In some embodiments, the leaching agent comprises a carbon dioxide plus oxygen leaching agent.
In some embodiments, S103 comprises: calculating the ratio of the leaching agent based on a ratio formula. And controlling the leaching agent injection subsystem to inject the leaching agent into the target ore layer based on the leaching agent ratio.
Specifically, the prepared leaching agent is injected into the target ore layer in a pulse mode, and carbon dioxide and oxygen in-situ leaching uranium extraction is carried out on the modified ore layer.
The proportioning formula comprises:
Wherein m O2 is the mass of oxygen injected during in-situ leaching, m CO2 is the mass of carbon dioxide injected during in-situ leaching, m 1 CO2 is the mass of carbon dioxide injected into a mineral seam during carbon dioxide blasting, m 2 CO2 is the mass of carbon dioxide discharged from the mineral seam during gas back-discharge, and alpha is the optimal leaching agent ratio during carbon dioxide and oxygen in-situ leaching. α=ρ O2/ρCO2,ρO2 is the oxygen mass per unit volume of the injected seam and ρ CO2 is the carbon dioxide mass per unit volume of the injected seam.
Optionally, the oxygen mass and the carbon dioxide mass are in kilograms, and the leachable agent is proportioned in kilograms per liter.
Specifically, after the mass of carbon dioxide and oxygen to be injected is calculated, a leachable agent injection system is started, a high-pressure pulse air pump is started, the leachable agent is injected into the ore deposit after the carbon dioxide blasting transformation, a seepage channel is further dredged, and uranium leaching reaction is carried out.
According to the permeability-increasing on-site leaching exploitation method for the hypotonic sandstone uranium ores, disclosed by the embodiment of the invention, the proportion of the carbon dioxide and oxygen on-site leaching agent can be accurately obtained by calculating the carbon dioxide content of the ore layer after carbon dioxide blasting and carbon dioxide back-discharge, so that the technical coordination of carbon dioxide blasting and carbon dioxide and oxygen on-site leaching is realized, the waste of carbon dioxide is reduced, and the on-site leaching exploitation efficiency is improved.
In the process, the monitoring control subsystem monitors the permeability of the mineral layer and the seepage range of the leaching solution in real time through the drilling and geophysical prospecting system, and displays and records engineering data in the on-site leaching process in real time.
According to the method for the enhanced leaching and on-site mining of the hypotonic sandstone uranium ores, provided by the embodiment of the invention, dynamic monitoring of the leaching solution seepage range, the ore bed permeability and the uranium resource recovery rate is realized through on-site detection, monitoring and control system architecture and control software, so that the carbon dioxide blasting parameters and the leaching solution injection parameters are accurately controlled, and the display, acquisition and analysis of engineering data are realized. Based on the mutual coordination of all subsystems, the high-yield and high-efficiency development of the low-permeability sandstone uranium ores is realized.
S104: and controlling a liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pump well 7, and extracting uranium from leaching liquid based on a uranium ore hydrometallurgy process.
In some embodiments, controlling the liquid pump to pump the gas-liquid mixture after the leaching reaction to the surface through the liquid pump well in S104 includes: and obtaining a preset pumping and injecting ratio. And controlling a liquid pump based on the injection-extraction ratio, and pumping the gas-liquid mixture after the leaching reaction to the surface through a liquid pump well.
The extraction-injection ratio comprises:
Wherein, beta is pumping and injecting ratio, Q 1 is injection flow rate of leaching agent, and Q 2 is pumping flow rate of leaching solution.
In some embodiments, extracting uranium from the leaching solution based on a uranium ore hydrometallurgical process in S104 includes: and controlling the gas-liquid separation system to store the gas in the gas storage tank and store the leaching solution in the sedimentation tank. Uranium is extracted from leaching solutions based on ion exchange, leaching extraction, and a precipitated uranium ore hydrometallurgical process.
Specifically, a liquid pump is started, leaching liquid after leaching reaction is lifted to the ground according to a preset liquid extraction and injection ratio, leaching liquid is separated in a sedimentation tank 4-3 by utilizing a gas-liquid separation and hydrometallurgy processing subsystem, and uranium resource collection is realized through a uranium ore hydrometallurgy process. And separating the free and desorbed gases, and extracting uranium from leaching solution in a sedimentation tank through ion exchange, solvent extraction, sedimentation and other uranium ore hydrometallurgy processes.
The process carries out carbon dioxide blasting in a well group consisting of a horizontal well and a vertical well, so that a three-dimensional fracture network is formed in the ore deposit. And (3) carrying out depressurization and reverse discharge on the gas left in the ore deposit after the carbon dioxide blasting, and dredging the ore deposit seepage channel. Carbon dioxide gas and oxygen with a certain proportion are injected into the liquid injection well to form leaching liquid with ore layer water, and the leaching liquid and uranium ore layer minerals undergo geochemical reaction to realize intensified leaching of uranium. Finally, the uranium is lifted to the surface by the liquid extraction well, and the required uranium concentrate is obtained by hydrometallurgical treatment. The monitoring control system monitors the seepage range of the on-site leaching solution and the transformation effect of the permeability of the mineral seam in real time, controls the operation of on-site equipment and the engineering implementation, and realizes the acquisition, display, processing and analysis of the engineering data of the enhanced on-site leaching uranium extraction.
The enhanced leaching and in-situ mining method for the hyposmosis sandstone uranium ores can update a modified fluidization mining method for the hyposmosis sandstone uranium ores, improves the theory and technical level of uranium resource in-situ leaching and mining, and improves the mining efficiency of the uranium ores.
Specifically, the embodiment of the invention applies the carbon dioxide blasting permeability increasing technology to the horizontal well, so that the application range of the technology can be widened. Further, a packer is arranged on the carbon dioxide blasting equipment, and a closed space is arranged outside the carbon dioxide blasting pipe, so that the cracking effect of blasting is improved. Finally, unlike the traditional carbon dioxide roadway blasting device, the embodiment of the invention is provided with the pushing device and the rock breaking device on the carbon dioxide blasting equipment, so that the blasting equipment can automatically move in the horizontal well, and the carbon dioxide multistage and repeated blasting is realized.
By applying the method provided by the embodiment of the invention, the physical transformation of the low-permeability ore layer can be realized, a smooth fracture network is formed, so that the uranium leaching range is improved, the technical closed loop is achieved in the aspects of ore layer permeability increase and efficient leaching, and the aim of efficient and high-yield mining is fulfilled.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of an in-situ leaching exploitation device for low-permeability sandstone uranium ores, which is provided by an embodiment of the invention.
Referring to fig. 4, an enhanced leaching in-situ mining apparatus 40 for hypotonic sandstone uranium ores provided by an embodiment of the present invention may include a blasting control module 410, a back-off control module 420, a leaching agent injection control module 430, and a drainage control module 440.
And the blasting control module 410 is used for placing the carbon dioxide circulating blasting device at the inlet end of the horizontal well and controlling the carbon dioxide circulating blasting device to perform circulating blasting fracturing on the target ore deposit.
And the back-drainage control module 420 is used for controlling the horizontal well to be opened, back-draining and collecting the carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit.
The leachable injection control module 430 is configured to control the leachable injection subsystem to inject leachable agents into the target seam.
And the liquid extraction control module 440 is used for controlling a liquid extraction pump to extract the gas-liquid mixture after leaching reaction to the surface through a liquid extraction well, and extracting uranium from the leaching solution based on a uranium ore hydrometallurgy process.
The low-permeability sandstone uranium deposit permeability-increasing in-situ leaching exploitation device provided by the invention can effectively realize large-scale fracturing of the ore deposit, form a smooth three-dimensional fracture network, and improve the overall permeability of the ore deposit, thereby improving the uranium deposit exploitation efficiency.
In some embodiments, the hypotonic sandstone uranium deposit permeability-increasing in-situ leaching production device 40 provided by the embodiments of the present invention may further include a drilling control module for controlling the horizontal well drilling system to prepare the horizontal well deflecting section, the horizontal well section, and the drainage well so that the horizontal well and the drainage well are located in the middle of the mineral-bearing aquifer. And (3) lifting the horizontal well drilling system.
In some embodiments, the carbon dioxide cycle blasting apparatus includes a plugging apparatus, a detonating tube, a rock breaking apparatus, and a pushing apparatus.
The blasting control module 410 is configured to: and controlling the plugging device and the detonating tube to operate, and blasting the current well section of the horizontal well. And controlling the operation of the rock breaking device to clean the broken rock of the well bore in the current well section. And controlling the pushing device to operate, so that the carbon dioxide circulating blasting device is pushed to the next well section in the horizontal well. And circularly executing to control the plugging device and the detonating tube to operate, controlling the rock breaking device to operate and controlling the pushing device to operate until the circular blasting fracturing of the horizontal well is completed.
In some embodiments, the leaching agent comprises a carbon dioxide plus oxygen leaching agent.
In some embodiments, the leachable injection control module 430 is configured to: calculating the ratio of the leaching agent based on a ratio formula. And controlling the leaching agent injection subsystem to inject the leaching agent into the target ore layer based on the leaching agent ratio.
The proportioning formula comprises:
Wherein m O2 is the mass of oxygen injected during in-situ leaching, m CO2 is the mass of carbon dioxide injected during in-situ leaching, m 1 CO2 is the mass of carbon dioxide injected into a mineral seam during carbon dioxide blasting, m 2 CO2 is the mass of carbon dioxide discharged from the mineral seam during gas back-discharge, and alpha is the optimal leaching agent ratio during carbon dioxide and oxygen in-situ leaching. α=ρ O2/ρCO2,ρO2 is the oxygen mass per unit volume of the injected seam and ρ CO2 is the carbon dioxide mass per unit volume of the injected seam.
In some embodiments, the pump control module 440 is configured to: and obtaining a preset pumping and injecting ratio. And controlling a liquid pump based on the injection-extraction ratio, and pumping the gas-liquid mixture after the leaching reaction to the surface through a liquid pump well.
The extraction-injection ratio comprises:
Wherein, beta is pumping and injecting ratio, Q 1 is injection flow rate of leaching agent, and Q 2 is pumping flow rate of leaching solution.
In some embodiments, the pump control module 440 is further configured to: and controlling the gas-liquid separation system to store the gas in the gas storage tank and store the leaching solution in the sedimentation tank. Uranium is extracted from leaching solutions based on ion exchange, leaching extraction, and a precipitated uranium ore hydrometallurgical process.
Fig. 5 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 5, the terminal device 50 of this embodiment includes: a processor 500, a memory 510, and a computer program 520 stored in the memory 510 and executable on the processor 500, such as a hypotonic sandstone uranium deposit enhanced in-situ leaching mining program. The processor 50, when executing the computer program 520, implements the steps of the various embodiments of the enhanced leaching mining method for hypotonic sandstone uranium ores described above, such as steps S101 to S104 shown in fig. 3. Or the processor 500, when executing the computer program 520, performs the functions of the modules/units of the apparatus embodiments described above, e.g., the functions of the modules 410 to 440 shown in fig. 4.
Illustratively, the computer program 520 may be partitioned into one or more modules/units that are stored in the memory 510 and executed by the processor 500 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program 520 in the terminal device 50. For example, the computer program 520 may be partitioned into a blasting control module, a back-drainage control module, a leachable injection control module, and a tapping control module.
The terminal device 50 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The terminal device may include, but is not limited to, a processor 500, a memory 510. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the terminal device 50 and is not meant to be limiting as the terminal device 50 may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal device may further include an input-output device, a network access device, a bus, etc.
The Processor 500 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 510 may be an internal storage unit of the terminal device 50, such as a hard disk or a memory of the terminal device 50. The memory 510 may also be an external storage device of the terminal device 50, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are provided on the terminal device 50. Further, the memory 510 may also include both an internal storage unit and an external storage device of the terminal device 50. The memory 510 is used for storing the computer program and other programs and data required by the terminal device. The memory 510 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. . Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (5)
1. An enhanced-permeability in-situ leaching mining method for hyposmosis sandstone uranium ores, which is characterized by comprising the following steps of:
Placing a carbon dioxide circulating blasting device at the inlet end of a horizontal well, and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on a target ore deposit; the carbon dioxide circulating blasting device comprises a plugging device, a blasting tube, a rock breaking device and a pushing device;
the pushing device comprises a movable arm, a transmission device and a first connector; the movable arms are distributed around the carbon dioxide circulating blasting device at equal intervals and are closely attached to the surface of the rock wall of the horizontal well, and the movable arms are driven by the transmission device to move left and right;
The rock breaking device comprises a rock breaking cutter and a second connector, and the plugging device comprises a packer and a third connector; the packer stretches out of the carbon dioxide blasting device under the action of air pressure so as to fill a gap between the carbon dioxide blasting device and surrounding rock and is tightly cut on the wall of the horizontal well, so that a closed space is formed between the left plugging device and the right plugging device;
The detonating tube comprises a heating rod and a constant pressure shear slice; the heating rod has the function of instantaneously and rapidly heating, so that the temperature of the liquid carbon dioxide can be rapidly increased in a short time and converted into gas; when the pressure of the carbon dioxide exceeds the threshold value of the constant-pressure shear slice, the carbon dioxide gas in the detonating tube is discharged to the energy release tube at a high speed; the energy release pipe is provided with a plurality of energy release holes, and high-pressure carbon dioxide gas is sprayed out of the energy release holes and acts on the mineral seam to cause a large number of damage cracks in the mineral seam;
The method further comprises the following steps of:
Controlling a horizontal well drilling system to prepare a horizontal well deflecting section, a horizontal well and a liquid pumping well so that the horizontal well and the liquid pumping well are positioned in the middle of an ore-bearing aquifer;
lifting the horizontal well drilling system;
the liquid extraction wells are vertical shafts and are arranged at two sides of the horizontal well at certain intervals to form a filling and extracting well group of the horizontal well and the vertical shaft; the distance between each liquid pumping well and the distance between the liquid pumping well and the horizontal well are 30 meters to 50 meters
The control of the carbon dioxide cyclic blasting device to carry out cyclic blasting fracturing on the target ore deposit comprises the following steps: controlling the plugging device and the detonating tube to run, and blasting the current well section of the horizontal well; controlling the rock breaking device to run, and cleaning the broken rock of the well bore in the current well section; controlling the pushing device to operate, so that the carbon dioxide circulating blasting device is pushed to the next well section in the horizontal well; the plugging device and the detonating tube are controlled to run in a circulating mode, the rock breaking device is controlled to run and the pushing device is controlled to run until the circulating blasting fracturing of the horizontal well is completed;
Controlling the horizontal well to be opened, reversely discharging and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit;
Controlling a leaching agent injection subsystem to inject a leaching agent into the target ore layer;
controlling a liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pump well, and extracting uranium from leaching liquid based on a uranium ore hydrometallurgy process;
The controlled leaching agent injection subsystem injects a leaching agent into the target mineral layer, comprising:
Calculating the ratio of the leaching agent based on a ratio formula;
controlling the leaching agent injection subsystem to inject leaching agent into the target ore layer based on the leaching agent ratio;
The proportioning formula comprises:
Wherein, m O2 is the mass of oxygen injected during in-situ leaching, m CO2 is the mass of carbon dioxide injected during in-situ leaching, m 1 CO2 is the mass of carbon dioxide injected into a mineral seam during carbon dioxide blasting, m 2 CO2 is the mass of carbon dioxide discharged from the mineral seam during gas back discharge, and alpha is the optimal leaching agent ratio during in-situ leaching of carbon dioxide and oxygen; α=ρ O2/ρCO2,ρO2 is the oxygen mass per unit volume of the injected seam, ρ CO2 is the carbon dioxide mass per unit volume of the injected seam;
the control of the liquid pump to pump the gas-liquid mixture after leaching reaction to the surface through a liquid pump well comprises the following steps:
Acquiring a preset pumping and injecting ratio;
controlling the liquid pump based on the liquid pumping ratio, and pumping the gas-liquid mixture after leaching reaction to the surface through the liquid pumping well;
The pumping and injecting ratio comprises the following steps:
Wherein, beta is pumping and injecting ratio, Q 1 is injection flow of leaching agent, and Q 2 is pumping flow of leaching solution;
an enhanced-permeability in-situ leaching mining device for hypotonic sandstone uranium ores, comprising:
The blasting control module is used for placing the carbon dioxide circulating blasting device at the inlet end of the horizontal well and controlling the carbon dioxide circulating blasting device to carry out circulating blasting fracturing on the target ore deposit;
The back-drainage control module is used for controlling the horizontal well to be opened, back-draining and collecting carbon dioxide gas, and reducing the pressure of the carbon dioxide in the target ore deposit until the pressure of the carbon dioxide is equal to the water pressure in the target ore deposit;
The leaching agent injection control module is used for controlling the leaching agent injection subsystem to inject the leaching agent into the target ore layer;
And the liquid extraction control module is used for controlling a liquid extraction pump to extract the gas-liquid mixture after leaching reaction to the surface through a liquid extraction well, and extracting uranium from leaching liquid based on a uranium mining hydrometallurgy process.
2. A hypotonic sandstone uranium ore enhanced in-situ leaching mining method according to claim 1, wherein the leaching agent includes a carbon dioxide plus oxygen leaching agent.
3. A hypotonic sandstone uranium ore enhanced in-situ leaching mining method according to claim 1, wherein the uranium ore hydrometallurgical process based extraction of uranium from the leaching solution comprises:
Controlling a gas-liquid separation system to store gas in a gas storage tank and storing the leaching solution in a sedimentation tank;
Uranium is extracted from the leaching solution based on ion exchange, leaching extraction, precipitated uranium ore hydrometallurgical processes.
4. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 3 when the computer program is executed.
5. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 3.
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| CN115506768B (en) * | 2022-09-27 | 2024-05-10 | 重庆大学 | Sandstone type uranium ore supercritical CO2Fracturing-in-situ leaching mining and CO2Sealing and storing integrated method |
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