Independent acid preparation device and method for in-situ leaching uranium mining unit

Abstract

The invention mainly belongs to the technical field of uranium deposit in-situ leaching mining, and particularly relates to a device and a method for independently preparing acid by a leaching mining unit of in-situ leaching uranium mining. In the current mining, the leaching liquid is uniformly prepared, so that the leaching liquid with the same acid concentration is added into mining areas in different leaching stages. The device is used for independently preparing acid for a single leaching unit and comprises a solution input device, a mixer and a solution output device, and the mixer is connected with the solution input device and the solution output device; the solution input device comprises a concentrated sulfuric acid pipeline and a liquid injection main pipeline, and the solution output device comprises a distributor and a shunting pipeline. According to the method, the concentration of concentrated sulfuric acid in a concentrated sulfuric acid pipeline is utilized to measure the concentration of concentrated sulfuric acid of adsorption tail liquid in a liquid injection main pipeline, and the flow of the concentrated sulfuric acid pipeline is calculated according to the concentration and flow of leaching liquid sulfuric acid required by a leaching unit. By adjusting the liquid injection main pipeline and the concentrated sulfuric acid pipeline electric adjusting valve, the reading of the concentrated sulfuric acid pipeline electromagnetic flowmeter is the same as the calculated value, so that accurate acid preparation is realized.

Description

Technical Field

[0001] The invention mainly belongs to the technical field of in-situ leaching mining of uranium deposits, and specifically relates to a device and method for independently preparing acid for an in-situ leaching uranium leaching unit. Background Art

[0002] In-situ uranium leaching is a uranium mining method that integrates mining and smelting. Under natural burial conditions, chemical reagents are injected into the ore layer to selectively dissolve the uranium in it, and then the uranium-containing solution is lifted to the surface for uranium extraction. Uranium deposits are not isotropic homogeneous bodies. For the same mining area, there will be certain differences in occurrence, mineral occurrence form, ore composition, permeability, etc., and the conditions required for leaching in each area are also different. At present, acid in-situ uranium leaching mines generally set up acid depots in water and metallurgy plants, and the leaching solution is generally prepared by directly adding acid in a liquid preparation pool (tank) or adsorption tail liquid pipeline. This unified preparation of leaching solution leads to the fact that the mining areas that are put into different batches and in different leaching stages can only be prepared with leaching solutions with the same acid concentration. In order to take into account the new and old mining areas, they can generally only be prepared in compromise. This often causes the leaching efficiency of the new mining area to be less than the optimal state due to insufficient acidity of the leaching solution, while the acid preparation in the old mining area is too high, resulting in reagent waste and excessive residual acid in the leaching solution. In view of this, it is necessary to study a new device and method to independently prepare acid for a single leaching unit (injection unit) to meet the needs of different mining areas, units and even single holes for leaching solution acid preparation, so as to achieve lean mining of uranium resources. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the existing process and provide a device and method for preparing acid on demand in different zones for in-situ leaching of uranium, which can realize independent preparation of acid for leaching solution in different mining areas, units or even single holes.

[0004] The solution of the present invention is:

[0005] A device for independently preparing acid for an in-situ leaching uranium leaching unit comprises a solution input device, a mixer and a solution output device, wherein the mixer connects the solution input device and the solution output device; the solution input device comprises a concentrated sulfuric acid pipeline and a liquid injection main pipeline, wherein the liquid outlet end of the concentrated sulfuric acid pipeline and the liquid outlet end of the liquid injection main pipeline are respectively connected to the mixer, and the solution output device comprises a distributor and a shunt pipeline, wherein the liquid inlet end of the distributor is connected to the mixer, and the liquid outlet end of the distributor is connected to the shunt pipeline.

[0006] An electromagnetic flowmeter and a check valve are arranged at the input end of the concentrated sulfuric acid pipeline in sequence, and an electric regulating valve is arranged at the liquid outlet end of the concentrated sulfuric acid pipeline.

[0007] The liquid outlet end of the liquid injection main pipeline is provided with an electric regulating valve.

[0008] The mixer is provided with a liquid inlet, a sulfuric acid inlet, a concentration measuring port, a liquid outlet and an online acid concentration meter. The liquid inlet of the mixer is connected to the liquid outlet end of the liquid injection main pipeline, the sulfuric acid inlet of the mixer is connected to the electric regulating valve at the liquid outlet end of the concentrated sulfuric acid pipeline, the concentration measuring port of the mixer is connected to the online acid concentration meter, and the liquid outlet of the mixer is connected to the liquid inlet end of the distributor.

[0009] The liquid outlet end of the distributor is connected to a shunt pipeline, and an electric regulating valve and an electromagnetic flowmeter are installed on the shunt pipeline.

[0010] A spoiler is arranged inside the mixer.

[0011] The electric regulating valve and the check valve are made of 316L material; the electromagnetic flowmeter is made of steel-lined PTFE material; the mixer is made of UPVC material; and the distributor is made of PE material.

[0012] A method for independently preparing acid for an in-situ leaching uranium leaching unit comprises the following steps:

[0013] Step 1: Given the concentration C1 of concentrated sulfuric acid in the concentrated sulfuric acid pipeline, measure the concentration C2 of the adsorption tail liquid in the injection main pipeline, and calculate the flow rate Q1 of the concentrated sulfuric acid pipeline based on the sulfuric acid concentration C3 and flow rate Q2 of the leaching solution required by the leaching unit.

[0014] Step 2: Open the electric regulating valve at the outlet end of the injection main pipeline to fill the adsorption tail liquid in the injection main pipeline into the mixer;

[0015] Step 3: Open the electric regulating valve at the outlet end of the concentrated sulfuric acid pipeline to fill the concentrated sulfuric acid in the concentrated sulfuric acid pipeline into the mixer;

[0016] Step 4: Observe the reading of the electromagnetic flowmeter on the concentrated sulfuric acid pipeline, and adjust the valve opening of the electric regulating valve on the concentrated sulfuric acid pipeline until the reading of the electromagnetic flowmeter is equal to Q1 calculated in step 1, and the reading of the online acid concentration meter is equal to the sulfuric acid concentration C3 of the leaching solution required by the leaching unit.

[0017] The calculation method of the concentrated sulfuric acid pipeline flow Q1 in step 1 is as follows:

[0018] Q1×(C1-C3)=(Q2-Q1)×(C3-C2)

[0019] Q1 is the reading of the electromagnetic flowmeter of the concentrated sulfuric acid pipeline, m 3 / h;

[0020] Q2 is the sum of the readings of the electromagnetic flowmeters on the diversion pipeline, m 3 / h;

[0021] C1 is the concentration of concentrated sulfuric acid in the concentrated sulfuric acid pipeline, kg / m 3 ;

[0022] C2 is the concentration of concentrated sulfuric acid in the adsorption tail liquid in the injection main pipeline, kg / m 3 ;

[0023] Sulfuric acid concentration of the leaching solution required for C3 leaching unit, kg / m 3 .

[0024] The concentrated sulfuric acid in the concentrated sulfuric acid pipeline has a content of 92.5% and a density of 1820 kg / m 3 of concentrated sulfuric acid.

[0025] The beneficial effects of the present invention are:

[0026] The device and method for independently preparing acid for an in-situ uranium leaching unit provided by the present invention, through opening a hole on the injection main pipe, the leaching liquid is introduced into a set of independently processed equipment for independent acid addition, and after mixing with concentrated sulfuric acid, the leaching liquid is accurately transported to the injection hole of the designated leaching unit through a independently processed distributor, so as to realize independent acid preparation of a single mining area, a single leaching unit and even a single injection hole, and will not affect the acid concentration of the leaching liquid in the mining area, can effectively ensure that the adsorption performance of the ion exchange resin will not be reduced, and realize the effective improvement of the uranium concentration of the leaching liquid in the single mining area. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of an independent acid preparation device for in-situ leaching uranium leaching unit

[0028] Figure 2 Schematic diagram of the mixer structure in an independent acid preparation device for in-situ leaching uranium leaching unit

[0029] Among them: 1. concentrated sulfuric acid pipeline, 2. liquid injection main pipeline, 3. electric regulating valve, 4. electromagnetic flowmeter, 5. check valve, 6. mixer, 7. distributor, 8. online acid concentration meter, 9. diversion pipeline, 10. liquid inlet, 11. sulfuric acid inlet, 12. concentration measurement port, 13. liquid outlet, 14. spoiler. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 , 2 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0031] Combination Figure 1 , 2A device for independently preparing acid for in-situ leaching uranium leaching unit comprises a solution input device, a mixer 6 and a solution output device, wherein the mixer 6 connects the solution input device and the solution output device; the solution input device comprises a concentrated sulfuric acid pipeline 1 and a liquid injection main pipeline 2; the liquid outlet end of the concentrated sulfuric acid pipeline 1 and the liquid outlet end of the liquid injection main pipeline 2 are respectively connected to the mixer 6, and the solution output device comprises a distributor 7 and a shunt pipeline 9, wherein the liquid inlet end of the distributor 7 is connected to the mixer 6, and the liquid outlet end of the distributor 7 is connected to the shunt pipeline 9. The number of shunt pipelines can be set according to the number of injection wells of the actual leaching unit (injection unit).

[0032] The mixer 6 is provided with a liquid inlet 10, a sulfuric acid inlet 11, a concentration measuring port 12, a liquid outlet 13 and an online acid concentration meter 8. The liquid inlet of the mixer 6 is connected to the liquid outlet end of the liquid injection main pipeline 2 through a flange, the sulfuric acid inlet of the mixer 6 is connected to the electric regulating valve 3 at the liquid outlet end of the concentrated sulfuric acid pipeline 1 through a flange, the concentration measuring port of the mixer 6 is connected to the online acid concentration meter 8 through a flange, the liquid outlet of the mixer 6 is connected to the liquid inlet end of the distributor 7, and a spoiler 14 is provided inside the mixer (6).

[0033] The input end of the concentrated sulfuric acid pipeline 1 is provided with an electromagnetic flowmeter 4 and a check valve 5 in sequence, and the liquid outlet end of the concentrated sulfuric acid pipeline 1 is provided with an electric regulating valve 3. The electric regulating valve 3 is used to adjust the flow of concentrated sulfuric acid and to cut off the concentrated sulfuric acid pipeline 1 and the injection main pipeline 2 during maintenance. The electromagnetic flowmeter 4 is used to measure the flow of concentrated sulfuric acid, and the check valve 5 is to prevent the solution in the injection main pipeline 2 from flowing back into the concentrated sulfuric acid pipeline 1, mixing with the concentrated sulfuric acid to dilute and release heat to burn the concentrated sulfuric acid pipeline 1.

[0034] An electric regulating valve 3 is provided at the liquid outlet end of the liquid injection main pipeline 2 .

[0035] The liquid outlet of the distributor 7 is connected to the shunt pipe 9, on which an electric regulating valve 3 and an electromagnetic flowmeter 4 are installed for adjusting the flow of different injection wells and for cutting off the solution of the corresponding pipe during maintenance.

[0036] The electric regulating valve 3 and the check valve 5 in the device are made of 316L material; the electromagnetic flowmeter 4 is made of steel-lined PTFE material; the mixer 6 is made of UPVC material; the distributor 7 is made of PE material. PE pipes have strong corrosion resistance, low price, and a certain deformation capacity that is not easy to be damaged.

[0037] Combination Figure 1 , 2 A method for independently preparing acid for an in-situ leaching uranium leaching unit comprises the following steps:

[0038] Step 1: The concentrated sulfuric acid concentration C1 in the concentrated sulfuric acid pipeline 1 is known, and the concentrated sulfuric acid concentration C2 of the adsorption tail liquid in the injection main pipeline 2 is measured. According to the sulfuric acid concentration C3 and flow rate Q2 of the leaching solution required by the leaching unit, the flow rate Q1 of the concentrated sulfuric acid pipeline 1 is calculated.

[0039] Q1×(C1-C3)=(Q2-Q1)×(C3-C2)

[0040] Q1 is the reading of the electromagnetic flowmeter 4 of the concentrated sulfuric acid pipeline 1, m 3 / h;

[0041] Q2 is the sum of the readings of the electromagnetic flowmeter 4 on the diversion pipe 9, m 3 / h;

[0042] C1 is the concentration of concentrated sulfuric acid in concentrated sulfuric acid pipeline 1, kg / m 3 ;

[0043] C2 is the concentration of concentrated sulfuric acid in the adsorption tail liquid in the injection main pipeline 2, kg / m 3 ;

[0044] Sulfuric acid concentration of the leaching solution required for C3 leaching unit, kg / m 3 .

[0045] Step 2: Open the electric regulating valve 3 at the outlet end of the injection main pipeline 2 to fill the adsorption tail liquid in the injection main pipeline into the mixer 6;

[0046] Step 3: Open the electric regulating valve 3 at the liquid outlet of the concentrated sulfuric acid pipeline 1 to fill the concentrated sulfuric acid in the concentrated sulfuric acid pipeline into the mixer 6;

[0047] Step 4: Observe the reading of the electromagnetic flowmeter 4 on the concentrated sulfuric acid pipeline 1, and adjust the valve opening of the electric regulating valve 3 on the concentrated sulfuric acid pipeline 1 until the reading of the electromagnetic flowmeter 4 is equal to Q1 calculated in step 1, and the reading of the online acid concentration meter 8 is equal to the sulfuric acid concentration C3 of the leaching solution required by the leaching unit.

[0048] The concentrated sulfuric acid in the concentrated sulfuric acid pipeline (1) has a content of 92.5% and a density of 1820 kg / m 3 of concentrated sulfuric acid.

[0050] The number of shunt pipes can be set according to the number of injection wells in the actual leaching unit (pumping unit). In this embodiment, the injection wells and pumping wells of the in-situ leaching mine are distributed in a five-point manner, that is, 4 injection wells are distributed in a square, located at the four corners of the square, and the pumping well is located at the center of the square. Every 4 injection wells and 1 pumping well are collectively referred to as a pumping unit (leaching unit). Each mining area is usually composed of more than 30 pumping units. Each mining area has a centralized control room to centrally control the pumping and injection flow rate of the mining area.

[0051] In this embodiment, the device connecting the injection main pipeline with the concentrated sulfuric acid pipeline is located in the valve well. The valve well is a square space located underground in the in-situ leaching mine for installing the valve of the injection main pipeline in the mining area.

[0052] As an implementable method, the distributor 7 can be installed under the steel platform of the control room.

[0053] As a feasible method, the concentrated sulfuric acid pipeline 1, the electric regulating valve 3, the electromagnetic flowmeter 4, the check valve 5, the mixer 6, and the online acid concentration meter 8 are all installed in the valve well, which can prevent the leakage of concentrated sulfuric acid from polluting the surface.

[0054] As an implementable method, all the devices are connected through pipes made of PE material and 316L material, and the connection method is flange connection.

[0055] By tracking the uranium concentration and sulfuric acid concentration of the leachate in the mining area equipped with the embodiment of the present invention, it was found that the process and equipment for independent acid preparation of the in-situ uranium leaching unit provided by the invention increased the uranium concentration of the leachate in the mining area by more than 10%, while the sulfuric acid concentration of the leachate in the mining area did not increase significantly.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for independently preparing acid for in-situ leaching of uranium, characterized in that: The invention comprises a solution input device, a mixer (6) and a solution output device, wherein the mixer (6) connects the solution input device and the solution output device; the solution input device comprises a concentrated sulfuric acid pipeline (1) and a liquid injection main pipeline (2), the liquid outlet end of the concentrated sulfuric acid pipeline (1) and the liquid outlet end of the liquid injection main pipeline (2) are respectively connected to the mixer (6), and the solution output device comprises a distributor (7) and a diversion pipeline (9), the liquid inlet end of the distributor (7) is connected to the mixer (6), and the liquid outlet end of the distributor (7) is connected to the diversion pipeline (9).

2. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 1, characterized in that: An electromagnetic flowmeter (4) and a check valve (5) are sequentially arranged at the input end of the concentrated sulfuric acid pipeline (1), and an electric regulating valve (3) is arranged at the liquid outlet end of the concentrated sulfuric acid pipeline (1).

3. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 2, characterized in that: An electric regulating valve (3) is provided at the liquid outlet end of the liquid injection main pipeline (2).

4. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 3, characterized in that: The mixer (6) is provided with a liquid inlet (10), a sulfuric acid inlet (11), a concentration measuring port (12), a liquid outlet (13) and an online acid concentration meter (8); the liquid inlet of the mixer (6) is connected to the liquid outlet end of the liquid injection main pipeline (2); the sulfuric acid inlet of the mixer (6) is connected to the electric regulating valve (3) at the liquid outlet end of the concentrated sulfuric acid pipeline (1); the concentration measuring port of the mixer (6) is connected to the online acid concentration meter (8); and the liquid outlet of the mixer (6) is connected to the liquid inlet end of the distributor (7).

5. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 4, characterized in that: The liquid outlet end of the distributor (7) is connected to a shunt pipe (9), and an electric regulating valve (3) and an electromagnetic flow meter (4) are installed on the shunt pipe (9).

6. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 4, characterized in that: A spoiler (14) is arranged inside the mixer (6).

7. The device for independently preparing acid for in-situ leaching uranium leaching unit according to claim 5, characterized in that: The electric regulating valve (3) and the check valve (5) are made of 316L material; the electromagnetic flow meter (4) is made of steel-lined polytetrafluoroethylene material; the mixer (6) is made of UPVC material; and the distributor (7) is made of PE material.

8. A method for independently preparing acid for in-situ leaching of uranium according to claim 5, characterized in that: The following steps are involved: Step 1: The concentrated sulfuric acid concentration C1 in the concentrated sulfuric acid pipeline (1) is known, and the concentrated sulfuric acid concentration C2 of the adsorption tail liquid in the injection main pipeline (2) is measured. According to the sulfuric acid concentration C3 and flow rate Q2 of the leaching solution required by the leaching unit, the flow rate Q1 of the concentrated sulfuric acid pipeline (1) is calculated. Step 2: Open the electric regulating valve (3) at the outlet end of the liquid injection main pipeline (2) to fill the adsorption tail liquid in the liquid injection main pipeline into the mixer (6); Step 3: Open the electric regulating valve (3) at the liquid outlet of the concentrated sulfuric acid pipeline (1) to fill the concentrated sulfuric acid in the concentrated sulfuric acid pipeline into the mixer (6); Step 4: Observe the reading of the electromagnetic flowmeter (4) on the concentrated sulfuric acid pipeline (1), and adjust the valve opening of the electric control valve (3) on the concentrated sulfuric acid pipeline (1) until the reading of the electromagnetic flowmeter (4) is equal to Q1 calculated in step 1, and the reading of the online acid concentration meter (8) is equal to the sulfuric acid concentration C3 of the leaching solution required by the leaching unit.

9. A method for independently preparing acid for in-situ leaching of uranium according to claim 8, characterized in that: The calculation method of the flow rate Q1 of the concentrated sulfuric acid pipeline (1) in step 1 is as follows: Q1×(C1-C3)=(Q2-Q1)×(C3-C2) Q1 is the reading of the electromagnetic flowmeter (4) of the concentrated sulfuric acid pipeline (1), m 3 / h; Q2 is the sum of the readings of the electromagnetic flowmeter (4) on the diversion pipe (9), m 3 / h; C1 is the concentration of concentrated sulfuric acid in the concentrated sulfuric acid pipeline (1), kg / m 3 ; C2 is the concentration of concentrated sulfuric acid in the adsorption tail liquid in the injection main pipeline (2), kg / m 3 ; Sulfuric acid concentration of the leaching solution required for C3 leaching unit, kg / m 3 .

10. A method for independently preparing acid for in-situ leaching of uranium according to claim 9, characterized in that: The concentrated sulfuric acid in the concentrated sulfuric acid pipeline (1) has a content of 92.5% and a density of 1820 kg / m 3 of concentrated sulfuric acid.

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