CN109577940B - In-situ leaching uranium mining gas control system and method - Google Patents

In-situ leaching uranium mining gas control system and method Download PDF

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CN109577940B
CN109577940B CN201811602366.0A CN201811602366A CN109577940B CN 109577940 B CN109577940 B CN 109577940B CN 201811602366 A CN201811602366 A CN 201811602366A CN 109577940 B CN109577940 B CN 109577940B
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gas
liquid
pipeline
valve
stop valve
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CN109577940A (en
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王立民
廖文胜
陈乡
刘正邦
李坡
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/28Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent

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  • Filling Or Discharging Of Gas Storage Vessels (AREA)
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Abstract

The invention relates to a system and a method for controlling in-situ leaching uranium mining gas, wherein the device comprises a gas mass flow controller, a pressure stabilizing valve, a gas inlet stop valve, a one-way valve, a buffer container, a gas outlet pipeline, a gas outlet stop valve and a liquid injection pipeline; the method comprises the following steps: firstly, connecting and installing pipelines; step two, normal gas control; thirdly, liquid backflow protection and treatment; and fourthly, descaling the pipeline. The invention uses the gas control system and method to apply the gas flow controller with high-precision measurement, on-line control and automatic parameter compensation, improves the long-term stable operation capability of gas filling, the preparation precision of the ground leaching reagent and the convenience of on-line automatic control and monitoring, and meets the process requirements of ground leaching.

Description

In-situ leaching uranium mining gas control system and method
Technical Field
The invention belongs to the field of in-situ leaching uranium mining, and particularly relates to a system and a method for controlling in-situ leaching uranium mining gas.
Background
In the in-situ leaching uranium extraction process, oxygen, carbon dioxide or other gases are generally required to be injected into a pressurized liquid injection pipeline according to the requirements of the process. And the gas is required to be added into the liquid pipeline stably and accurately in a metering manner under the condition that the environmental temperature and the pressure of the liquid injection pipeline are constantly changed. In the existing in-situ leaching uranium mining gas filling process, a gas metering device mainly adopts a glass rotor flowmeter, a metal float flowmeter and the like. These types of meters are characterized by low accuracy of flow measurement (total relative error of about 10%), difficulty in stable metering of flow rate as a function of medium pressure and temperature, and inability to be automatically adjusted and remotely controlled. Preferably, the gas injection is more difficult to control when the gas injection is performed within the low flow range of 1-10L/min. In the ground immersion process, the environmental temperature, the medium pressure and the process conditions are changed frequently, and the mechanical measuring device is adopted for a long time and manual adjustment and monitoring are carried out, so that great errors are brought to the process conditions. In other industries, high precision gas mass flow controllers commonly used include thermal, coriolis, differential, positive displacement flow controllers, and the like. These gas control instruments have the functions of ambient temperature compensation and gas pressure compensation, and can automatically correct and control the flow rate of gas on line, so that the gas can be stably filled and adjusted according to the change of the liquid injection amount. However, such gas flow controllers have precision measurement elements and sensing devices, and require a high degree of environmental cleanliness. If the method is used for the ground leaching process, under the condition that the pressure of the gas or liquid injection pipeline fluctuates, liquid is easy to flow back to the gas injection pipeline, a gas metering instrument is damaged, and scale is easy to form in the gas inlet pipeline and the instrument device to block the gas pipeline; in addition, the pressure difference endured by such a gas flowmeter is small (less than 3atm), and since the pressure of the ground impregnation liquid is constantly changed within a certain range, when the pressure difference between gas injection and liquid injection is large, the gas flow rate is difficult to control. Thus, the application of high precision gas mass flow controllers to the in-situ leaching production is hindered.
In order to prevent the damage of gas pipeline device and instrument caused by liquid back flow in the gas filling process, the measures adopted are to install check valves (check valves) with various structures in the pipeline. However, due to the characteristics of pressure fluctuation in the gas/liquid pipeline, siphonage of the gas injection pipeline on liquid and easy scaling of a gas-liquid combination part, the check valve is easy to corrode and scale on the surface, so that the check valve loses the function and damages the instrument pipe fitting.
In order to solve the application problem, in the process of filling gas into the liquid injection pipeline, a gas injection control system and an application method which can accurately control the gas flow, control and record on line, prevent liquid from flowing back and remove scale are required to be designed and developed so as to ensure stable and continuous gas injection.
Disclosure of Invention
The invention aims to: a gas injection control system and a gas injection control method which are accurate in metering, capable of realizing on-line control and automatic temperature and pressure compensation, large in pressure difference range, capable of preventing liquid from flowing back and capable of removing scale are developed. Under the conditions of large fluctuation gradient and poor environment of the ground leaching process, the method can accurately control the stable filling of the gas, protect the gas pipeline device and the instrument from being polluted and blocked by dirt, and realize the automation of the gas filling process.
The technical scheme of the invention is as follows: a kind of ground soaks and adopts the uranium gas control system, including gas mass flow controller, pressure-stabilizing valve, gas inlet stop valve, check valve, buffer vessel, gas outlet pipeline, gas outlet stop valve and liquid injection pipeline;
the buffer container is a transparent pressure-resistant container, and the top end, the side surface and the bottom end of the buffer container are respectively provided with a gas inlet, a gas outlet and a liquid discharge valve;
the right end of the gas mass flow controller is used for being connected with a ground leaching uranium gas pipeline, and the left end of the gas mass flow controller is sequentially connected with a pressure stabilizing valve, a gas inlet stop valve, a one-way valve and a gas inlet of a buffer container; the gas outlet of the buffer container is connected to the right end of the gas outlet stop valve through a gas outlet pipeline, and the left end of the gas outlet stop valve is connected to the liquid injection pipeline.
Furthermore, the gas mass flow controller is a gas mass flow controller which can achieve the accuracy of +/-1% F.S or more, can automatically compensate the temperature and the pressure and can be controlled on line.
Furthermore, the pressure stabilizing valve is a gas pressure control component suitable for low pressure and small flow.
Furthermore, the volume of the buffer container is 100-1000 mL.
Further, during work, the in-situ leaching uranium mining gas enters the buffer container through the gas mass flow controller, the pressure stabilizing valve, the gas inlet stop valve, the gas outlet stop valve and the one-way valve, and then is injected into the liquid injection pipeline through the gas outlet pipeline and the gas outlet stop valve; the liquid flowing back enters the buffer container through the gas outlet stop valve and the gas outlet pipeline and is discharged by the liquid discharge valve.
The invention discloses a method for controlling in-situ leaching uranium mining gas, which uses the system of the invention and comprises the following steps:
firstly, connecting and installing pipelines;
connecting a gas mass flow controller with an in-situ leaching uranium mining gas pipeline, and connecting a gas outlet pipeline with a liquid injection pipeline; closing the gas outlet stop valve and the liquid discharge valve, setting the outlet pressure of the pressure stabilizing valve, opening the gas inlet stop valve, filling the system pipeline with gas, and displaying the gas mass flow controller as zero;
step two, normal gas control;
setting full-scale and instantaneous flow of the gas mass flow controller according to the pressure of a liquid injection pipeline and the injected gas quantity, and adjusting a pressure stabilizing valve to enable the pressure difference at the two ends of the gas mass flow controller to be constant; closing the liquid discharge valve, opening the gas inlet stop valve and the gas outlet stop valve, and normally filling gas into the liquid injection pipeline through the accurate metering and automatic control of the gas mass flow controller;
thirdly, liquid backflow protection and treatment;
when the liquid injection or gas injection pressure fluctuates, liquid flows back to the gas path and enters the buffer container through a gas outlet stop valve and a gas outlet pipeline in the device; at this point, the liquid level can be observed through the buffer vessel; when the liquid level approaches to a gas outlet pipeline of the buffer container, closing a gas pipe outlet stop valve of the buffer container, and opening a liquid discharge valve to discharge liquid;
fourthly, descaling the pipeline;
during the gas injection process, the gas outlet pipeline is gradually scaled due to the liquid backflow and the gas-liquid mixing for multiple times, and the gas flow is stably and gradually reduced; at the moment, the gas inlet stop valve is closed, and the liquid discharge valve is opened, so that the liquid in the liquid injection pipeline backflushs the gas outlet pipeline; then the liquid discharge valve is closed, the gas inlet stop valve is opened, and the gas outlet pipeline is flushed; the water scale in the gas pipeline is removed by repeatedly using positive gas flushing and liquid back flushing and quickly and pulse flushing.
Furthermore, in the fourth step, when the quantity of the liquid backwashing water is increased, the descaling effect is achieved.
Further, in the fourth step, when the backflushing liquid in the buffer container approaches to the gas outlet pipeline, the gas pipe outlet stop valve of the buffer container 5 is closed, and the liquid discharge valve is opened to discharge the liquid.
The invention has the following remarkable effects: by the gas control system and the method, the gas flow controller with high-precision metering, online control and automatic parameter compensation can be applied, the capability of long-term stable operation of gas filling, the preparation precision of the ground leaching reagent and the convenience of online automatic control and monitoring are improved, and the process requirements of ground leaching are met; the pollution and damage of the gas pipeline device and the control instrument thereof are avoided, and the repeated maintenance of frequently dredging the gas pipeline and the instrument blocked by the water scale is eliminated; when incrustation scale is generated at the joint of the gas pipeline and the liquid injection pipeline, the incrustation scale can be removed in time through the system, and the normal operation of construction is ensured. The application of the system solves the last difficulty of realizing automatic control of gas filling in the in-situ leaching uranium mining process.
Drawings
FIG. 1 is a flow chart of a control system for in-situ uranium leaching gas according to the present invention;
FIG. 2 is a schematic view of the buffer container of the present invention;
in the figure, 1. gas mass flow controller; 2. a pressure maintaining valve; 3. a gas inlet shutoff valve; 4. a one-way valve; 5. a buffer container; 6. a gas outlet line; 7. a gas outlet shutoff valve; 8. a liquid injection pipeline; 9. a gas inlet; 10. a gas outlet; 11. and a drain valve.
Detailed Description
The system and method for controlling in-situ leaching uranium mining gas according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the in-situ leaching uranium mining gas control system comprises a gas mass flow controller 1, a pressure stabilizing valve 2, a gas inlet stop valve 3, a one-way valve 4, a buffer container 5, a gas outlet pipeline 6, a gas outlet stop valve 7 and a liquid injection pipeline 8;
the buffer container 5 is a transparent pressure-resistant container, and the top end, the side surface and the bottom end of the buffer container are respectively provided with a gas inlet 9, a gas outlet 10 and a liquid discharge valve 11;
the right end of the gas mass flow controller 1 is used for being connected with a ground leaching uranium gas pipeline, and the left end of the gas mass flow controller is sequentially connected with a pressure stabilizing valve 2, a gas inlet stop valve 3, a one-way valve 4 and a gas inlet 9 of a buffer container 5; the gas outlet 10 of the buffer container 5 is connected to the right end of the gas outlet shutoff valve 7 through the gas outlet pipeline 6, and the left end of the gas outlet shutoff valve 7 is used for being connected to the liquid injection pipeline 8.
Further, the gas mass flow controller 1 is a gas mass flow controller which can achieve an accuracy of ± 1% F · S or more, can automatically compensate for temperature and pressure, and can be controlled on line.
Further, the pressure maintaining valve 2 is a gas pressure control component suitable for low pressure and small flow.
Furthermore, the volume of the buffer container 5 is 100-1000 mL.
Further, during work, the in-situ leaching uranium mining gas enters the buffer container 5 through the gas mass flow controller 1, the pressure stabilizing valve 2, the gas inlet stop valve 3, the gas outlet stop valve 7 and the check valve 4, and then is injected into the liquid injection pipeline 8 through the gas outlet pipeline 6 and the gas outlet stop valve 7; the liquid flowing back enters the buffer container 5 through the gas outlet stop valve 7 and the gas outlet pipeline 6 and is discharged by the liquid discharge valve 11.
The invention discloses a method for controlling in-situ leaching uranium mining gas, which uses the system of the invention and comprises the following steps:
firstly, connecting and installing pipelines;
connecting a gas mass flow controller 1 with an in-situ leaching uranium mining gas pipeline, and connecting a gas outlet pipeline with a liquid injection pipeline 8; closing the gas outlet stop valve 7 and the liquid discharge valve 11, setting the outlet pressure of the pressure stabilizing valve 2, opening the gas inlet stop valve 3, filling the system pipeline with gas, and displaying the gas mass flow controller 1 as zero;
step two, normal gas control;
setting the full range and instantaneous flow of the gas mass flow controller 1 according to the pressure of the liquid injection pipeline 8 and the gas quantity to be injected, and adjusting the pressure stabilizing valve 2 to ensure that the pressure difference at the two ends of the gas mass flow controller 1 is kept constant; the liquid discharge valve 11 is closed, the gas inlet stop valve 3 and the gas outlet stop valve 7 are opened, and gas is normally filled into the liquid injection pipeline 8 through the accurate metering and automatic control of the gas mass flow controller 1;
thirdly, liquid backflow protection and treatment;
when the liquid injection or gas injection pressure fluctuates, liquid flows back to the gas path and enters the buffer container 5 through a gas outlet stop valve 7 and a gas outlet pipeline 6 in the device; at this point, the liquid level can be observed through the buffer vessel 5; when the liquid level approaches to a gas outlet pipeline of the buffer container 5, closing the gas pipe outlet stop valve 7 of the buffer container 5, and opening the liquid discharge valve 11 to discharge liquid;
fourthly, descaling the pipeline;
during the gas injection process, the gas outlet pipeline is gradually scaled due to the liquid backflow and the gas-liquid mixing for multiple times, and the gas flow is stably and gradually reduced; at the moment, the gas inlet stop valve 3 is closed, the liquid discharge valve 11 is opened, and the liquid in the liquid injection pipeline 8 backflushs the gas outlet pipeline 6; then the liquid discharge valve 11 is closed, the gas inlet stop valve 3 is opened, and the gas outlet pipeline 6 is flushed; the water scale in the gas pipeline is removed by repeatedly using positive gas flushing and liquid back flushing and quickly and pulse flushing.
Furthermore, in the fourth step, when the quantity of the liquid backwashing water is increased, the descaling effect is achieved.
Further, in the fourth step, when the backflushing liquid in the buffer container 5 approaches the gas outlet pipeline, the gas pipe outlet stop valve 7 of the buffer container 5 is closed, and the liquid discharge valve 11 is opened to discharge the liquid.
In the application process of the control system, when the injection pressure of the pressure stabilizing valve changes, the pressure difference between the inlet and the outlet of the gas flow controller is effectively ensured to be stabilized in a proper range; the gas flow control precision reaches 0.1SLM, the stability is very good, and the gas flow can be monitored and adjusted in real time through an online control device; under the condition of gas-liquid pressure fluctuation, the volume of single backflow liquid is 50-200 mL, the backflow liquid can be discharged in time, and the pollution of the backflow liquid to a gas circuit device and an instrument can be effectively prevented; the scale in the pipeline is removed and the pipeline is not detached, so that the long-time stable operation can be maintained.
The embodiment shows that the gas control system has safe, practical, stable and convenient performance and can meet the requirements of gas metering control and protection in the actual production or test process.

Claims (7)

1. The utility model provides a ground soaks uranium mining gas control system which characterized in that: comprises a gas mass flow controller (1), a pressure stabilizing valve (2), a gas inlet stop valve (3), a one-way valve (4), a buffer container (5), a gas outlet pipeline (6), a gas outlet stop valve (7) and a liquid injection pipeline (8);
the buffer container (5) is a transparent pressure-resistant container, and the top end, the side surface and the bottom end of the buffer container are respectively provided with a gas inlet (9), a gas outlet (10) and a liquid discharge valve (11);
the right end of the gas mass flow controller (1) is used for being connected with a ground leaching uranium gas pipeline, and the left end of the gas mass flow controller is sequentially connected with a pressure stabilizing valve (2), a gas inlet stop valve (3), a one-way valve (4) and a gas inlet (9) of a buffer container (5); a gas outlet (10) of the buffer container (5) is connected to the right end of the gas outlet stop valve (7) through a gas outlet pipeline (6), and the left end of the gas outlet stop valve (7) is connected to a liquid injection pipeline (8);
during operation, in-situ leaching uranium mining gas enters a buffer container (5) through a gas mass flow controller (1), a pressure stabilizing valve (2), a gas inlet stop valve (3) and a one-way valve (4), and then is injected into a liquid injection pipeline (8) through a gas outlet pipeline (6) and a gas outlet stop valve (7); the liquid which flows back enters the buffer container (5) through the gas outlet stop valve (7) and the gas outlet pipeline (6) and is discharged by the liquid discharge valve (11).
2. The in-situ leaching uranium mining gas control system of claim 1, wherein: the gas mass flow controller (1) has the precision of +/-1% F.S or more, can automatically compensate the temperature and the pressure, and can be controlled on line.
3. The in-situ leaching uranium mining gas control system of claim 1, wherein: the pressure stabilizing valve (2) is a gas pressure control component suitable for low pressure and small flow.
4. The in-situ leaching uranium mining gas control system of claim 1, wherein: the volume of the buffer container (5) is 100-1000 mL.
5. A method for controlling in-situ uranium mining gas, wherein the system of claim 1 is used, comprising the steps of:
firstly, connecting and installing pipelines;
connecting a gas mass flow controller (1) with an in-situ leaching uranium mining gas pipeline, and connecting a gas outlet pipeline with a liquid injection pipeline (8); closing the gas outlet stop valve (7) and the liquid discharge valve (11), setting the outlet pressure of the pressure stabilizing valve (2), opening the gas inlet stop valve (3), filling the system pipeline with gas, and displaying the gas mass flow controller (1) as zero;
step two, normal gas control;
setting the full range and instantaneous flow of the gas mass flow controller (1) according to the pressure of the liquid injection pipeline (8) and the injected gas quantity, and adjusting the pressure stabilizing valve (2) to keep the pressure difference at the two ends of the gas mass flow controller (1) constant; closing a liquid discharge valve (11), opening a gas inlet stop valve (3) and a gas outlet stop valve (7), and normally filling gas into a liquid injection pipeline (8) through accurate metering and automatic control of a gas mass flow controller (1);
thirdly, liquid backflow protection and treatment;
when the liquid injection or gas injection pressure fluctuates, liquid flows back to the gas path and enters the buffer container (5) through a gas outlet stop valve (7) and a gas outlet pipeline (6) in the device; at this time, the liquid level can be observed through the buffer container (5); when the liquid level approaches to a gas outlet pipeline of the buffer container (5), closing the gas pipe outlet stop valve (7), and opening the liquid discharge valve (11) to discharge liquid;
fourthly, descaling the pipeline;
during the gas injection process, the gas outlet pipeline is gradually scaled due to the liquid backflow and the gas-liquid mixing for multiple times, and the gas flow is stably and gradually reduced; at the moment, the gas inlet stop valve (3) is closed, the liquid discharge valve (11) is opened, and the liquid in the liquid injection pipeline (8) backflushs the gas outlet pipeline (6); then the liquid discharge valve (11) is closed, the gas inlet stop valve (3) is opened, and the gas outlet pipeline (6) is flushed; the water scale in the gas outlet pipeline is removed by repeatedly using gas positive flushing and liquid back flushing and quickly and pulse flushing.
6. The method for controlling in-situ leaching uranium mining gas according to claim 5, wherein: in the fourth step, when the quantity of the liquid backwashing water is increased, the descaling effect is achieved.
7. The method for controlling in-situ leaching uranium mining gas according to claim 5, wherein: and in the fourth step, when the backflushing liquid in the buffer container (5) approaches to the gas outlet pipeline, closing the gas pipe outlet stop valve (7), and opening the liquid discharge valve (11) to discharge the liquid.
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CN111173490A (en) * 2019-12-30 2020-05-19 中核内蒙古矿业有限公司 Control device and method for closed-loop circulation system of in-situ leaching uranium extraction liquid
CN111335865A (en) * 2020-03-25 2020-06-26 核工业北京化工冶金研究院 Advanced closed type liquid pumping and injecting system for in-situ leaching uranium mining mine
CN114152732A (en) * 2021-12-15 2022-03-08 石家庄铁道大学 Sandstone uranium mine ground immersion mining simulation test device

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CN105463218A (en) * 2016-01-13 2016-04-06 南华大学 Testing device and testing method for pressurized column leaching of uranium ore by means of CO2 and O2
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CN107605438A (en) * 2017-09-30 2018-01-19 中核通辽铀业有限责任公司 A kind of ground-dipping uranium extraction mining area central station of floating dock modular unit and method

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