CN111020243A - In-situ leaching uranium mining method by low-concentration sulfuric acid synergistic organisms - Google Patents
In-situ leaching uranium mining method by low-concentration sulfuric acid synergistic organisms Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
- C22B60/02—Obtaining thorium, uranium, or other actinides
- C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
- C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
- C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
- C22B60/0226—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors
- C22B60/0234—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors sulfurated ion as active agent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
Abstract
The invention discloses a method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms, which comprises the following steps of firstly adding a small amount of surfactant in an acidification period to reduce the surface tension of ore and expand a leaching agent on the surface of the ore, so that the contact area of the ore and the leaching agent is increased, the leaching agent is easier to chemically react with the ore, the ore is disintegrated and separated into fragments, and the leaching rate of uranium is synergistically promoted; then further utilizing Fe in the ore by using thiobacillus ferrooxidans2+As energy source substance for growth and reproduction, sulfuric acid and Fe are produced by catalytic oxidation3+So as to selectively dissolve and leach uranium in ore body, directly add the domesticated thiobacillus ferrooxidans into ore layer solution by adopting an in-situ leaching process without independently building a biological oxidation tank, reduce the death probability of thalli, improve the leaching rate of uranium, reduce the using amount of sulfuric acid, shorten the leaching period, reduce environmental pollution and reduce the number of dead thalliMining costs.
Description
Technical Field
The invention relates to the technical field of leaching uranium mining, in particular to a method for in-situ leaching uranium mining by using low-concentration sulfuric acid and a synergistic organism.
Background
In-situ leaching uranium mining (in short, in-situ leaching uranium mining) is to inject leaching solution prepared according to a certain proportion into an ore layer through an injection well drilled from the earth surface to the ore layer, the injected leaching solution is in contact with useful components in ores to carry out chemical reaction, and generated soluble compounds leave a chemical reaction area under the action of diffusion and convection and enter solution flow which permeates and migrates along the ore layer to form leaching solution; and lifting the leachate from the leaching well to the ground surface through the ore bed, conveying the extracted leachate to a recovery workshop for process treatment such as ion exchange and the like, and finally obtaining a qualified product. In-situ leaching uranium mining is a novel oil mine mining method integrating mining and smelting. The in-situ leaching uranium mining method is widely suitable for permeable sandstone type uranium deposit.
The in-situ leaching uranium mining comprises two parts of underground leaching and leachate treatment. The leaching part of the ore body is divided into two types according to the different selected leaching solutions: acid leaching and alkaline leaching. Acid leaching is a leaching process that uses an acidic solution as a leaching agent. Reagents that can be used as leaching agents for acid processes are: sulfuric acid, nitric acid, hydrochloric acid, and the like. Alkaline leaching is a leaching process that uses an alkaline solution as a leaching agent. The leaching agent capable of being used for alkaline leaching mainly comprises: sodium carbonate, ammonium carbonate, sodium bicarbonate, ammonium bicarbonate, and the like.
The method has the advantages of high strength of leaching uranium by sulfuric acid, short production time of mining areas, high leaching rate and the like, and is widely applied to leaching uranium mines in the world. At present, the natural uranium yield is the first major country, kazakhstan, and almost all products come from acid-method leaching mines. In addition, most of the in-situ leaching mines in Uzbekhstan, Australia and China use sulfuric acid as a leaching agent.
In a certain uranium deposit found in the Yili basin in Xinjiang, China, the content of carbonate in the sand body of the ore bed is changed quite complexly, and the content range is 0.52-5.19%. The conventional acid method is used for leaching in the uranium deposit, and because part of ore bodies have high carbonate content, long acidification period, slow pH value reduction, large unit acid consumption in the leaching process and low uranium concentration in leachate. Meanwhile, chemical blockage is easy to occur in the leaching process, and underground water pollution is caused.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organismsThe surface active agent is used for reducing the surface tension of the ore and enabling the leaching agent to spread on the surface of the ore, so that the contact area between the ore and the leaching agent is increased, the leaching agent can be more easily subjected to chemical reaction with the ore, the ore is broken and separated into fragments, and the leaching rate of uranium is synergistically promoted; then further utilizing Fe in the ore by using thiobacillus ferrooxidans2+As energy source substance for growth and reproduction, sulfuric acid and Fe are produced by catalytic oxidation3+Therefore, uranium in the ore body is selectively dissolved and leached, the leaching rate of the uranium is improved, the use amount of sulfuric acid is reduced, the leaching period is shortened, the environmental pollution is reduced, the mining cost can be effectively reduced, and the enterprise capacity is increased.
In order to achieve the purpose, the invention adopts the technical scheme that:
a low-concentration sulfuric acid synergistic biological in-situ leaching uranium mining method comprises the following steps:
s1, pumping underground water of the ore bed, injecting the pumped underground water into the ore bed, and circularly dredging the ore bed through the underground water for 20 days;
s2, after the circulation of the underground water is finished, injecting oxygen into the underground water as an oxidant until the oxygen reaches the maximum saturated solubility in the water; meanwhile, dilute sulfuric acid and a surfactant are added into underground water to serve as a leaching agent, the pH value of the leaching agent is kept between 3 and 4, and the dilute sulfuric acid and the surfactant are stopped being added when the pH value of the leaching agent is less than or equal to 2.0;
s3, adding domesticated thiobacillus ferrooxidans bacterial liquid as a leaching agent into underground water, and finishing bacterial leaching when the uranium concentration of a leaching solution is lower than 5 mg/L;
s4, leaching uranium metal by leaching solution, and carrying out complexation reaction on the leaching solution and hexavalent uranium in the ore to form [ UO2(CO3)3]4-And [ UO2(CO3)3]2-When the uranium concentration in the leachate is more than 300mg/L, pumping out the leachate by using a submersible pump;
s5, resin adsorption, and D231YT strong base anion exchange resin is adopted.
In the present invention, Thiobacillus ferrooxidans utilizes Fe in ore2+Formation of sulfuric acid and Fe3+The mechanism of action for in-situ leaching of uranium from ore is as follows:
Fe3+as an oxidant to oxidize the tetravalent uranium in the uranium ore,
fe produced by the above reaction2+Is oxidized into Fe by the action of bacteria3+；
According to the method, a small amount of surfactant is added into the uranium ore in the acid leaching period, the surfactant can reduce the solid-liquid contact angle between the leaching agent and the ore, the leaching solution can be spread on the surface of the ore, the flowing speed of the leaching solution on the surface of the ore is increased, and the wetting effect of the leaching solution on the solid is enhanced. Meanwhile, the surfactant is added, so that the viscosity of the solution can be effectively reduced, and the problem of argillization in ore leaching is well reduced, so that the leaching rate of uranium is accelerated; in addition, the hydrophilic group of the surfactant can penetrate into the leaching solution, and the hydrophobic group enters into the ore cracks, so that the pressure difference of the ore and the leaching solution which are balanced originally is changed, and the leaching solution can be permeated in the microcracks, and the leaching rate of uranium can be improved. Meanwhile, the surfactant also enhances the concentration gradient of the surface of the ore, accelerates the processes of molecular diffusion and convection diffusion, and prevents the channel blockage caused by the migration of fine particles, thereby synergistically improving the leaching rate of the ore.
As a further limitation of the above scheme, the dilute sulfuric acid is added in step S2 in the following manner: dilute sulfuric acid is added into the main liquid injection pipeline on line, and meanwhile, the leaching solution is monitored on lineAdjusting the amount of dilute sulfuric acid based on the pH of the leaching solution, and monitoring the leaching solution U, HCO by sampling3 -、Cl-、Ca2+、Mg2+、SO4 2-The change of the residual oxygen and the change of the single-hole injection amount.
As a further limitation of the above scheme, in step S2, the oxygen injection concentration is 400-500 mg/L at the initial stage of leaching; when the residual oxygen concentration in the leaching solution reaches 15mg/L, the oxygen injection concentration is reduced to 300mg/L, and when the leaching rate reaches 65%, the oxygen injection is stopped.
The thiobacillus ferrooxidans is aerobic bacteria and can survive under a trace amount of oxygen, and oxygen is injected into leached gas to provide favorable conditions for growth and propagation of the thiobacillus ferrooxidans, so that high activity is maintained in a bacteria leaching period, ferrous iron is quickly oxidized to generate ferric iron and sulfuric acid, the oxidation-reduction potential of a leaching agent is improved, the leaching environment and the leaching performance of uranium ores are improved, and the leaching rate of uranium is synergistically improved.
As a further limitation of the above scheme, in step S2, the surfactant is one or two of disodium fatty alcohol polyoxyethylene ether sulfosuccinate or disodium coco monoethanolamide sulfosuccinate.
As a further limitation of the above aspect, the concentration of the surfactant is 0.01 to 0.1 wt%.
A certain amount of surfactant is added in the acid leaching period, so that the surface tension of the leaching agent can be reduced, the leaching agent is spread on the surface of the ore, the contact area between the ore and the leaching agent is increased, the reaction is more sufficient, and the leaching of uranium is promoted; however, the addition of a surfactant at too high a concentration will increase the degree of foaming of the ore body, which is detrimental to uranium leaching. The inventor finds that the leaching of uranium can be promoted when the concentration of the surfactant is 0.01-0.1 wt% through a large amount of experiments.
As a further limitation of the scheme, the addition concentration of the dilute sulfuric acid is 0.3-0.5 g/L.
In the early stage of leaching, the good in the ore can be quickly consumed by acidificationAcid substances are used for facilitating leaching of uranium and providing a proper acid environment for growth and leaching of thiobacillus ferrooxidans in the subsequent bacterial leaching process; however, high concentrations of sulfuric acid can lead to Ca in the ore body2+、Mg2+A large amount of leaching is carried out, and calcium sulfate and magnesium sulfate are generated and precipitated, so that ore bed blockage is caused, the permeability of the ore bed is influenced, the uranium leaching process is reduced, and the uranium leaching rate is reduced.
As a further limitation of the above-mentioned means, in step S3, the concentration of the acclimatized Thiobacillus ferrooxidans bacterial liquid is 1.0X 106More than one strain/mL, and the addition amount of the bacterial liquid is 10-20L/(m)2·h)。
As a further limitation of the above scheme, in step S4, the D231YT strong-base anion exchange resin has a mass exchange capacity of 3.7mmol/g, a particle size of 0.63-1.40 mm, a wet apparent density of 0.70g/ml wet R, and a penetration ball rate of not less than 90%.
Compared with the prior art, the invention has the beneficial effects that:
(1) firstly, adding a small amount of surfactant in an acidification period to reduce the surface tension of the ore and spread the leaching agent on the surface of the ore, so that the contact area between the ore and the leaching agent is increased, the leaching agent is easier to react with the ore chemically, the ore is disintegrated and separated into fragments, and the leaching rate of uranium is synergistically promoted; then further utilizing Fe in the ore by using thiobacillus ferrooxidans2+As energy source substance for growth and reproduction, sulfuric acid and Fe are produced by catalytic oxidation3+Therefore, uranium in the ore body is selectively dissolved and leached, the leaching rate of the uranium is improved, the use amount of sulfuric acid is reduced, the leaching period is shortened, the environmental pollution is reduced, the mining cost can be effectively reduced, and the enterprise capacity is increased.
(2) The method adopts an in-situ leaching process, directly adds the domesticated thiobacillus ferrooxidans into the ore bed solution for autoxidation bioleaching, does not need to occupy space and independently build a biological oxidation tank, and simultaneously avoids the probability of thalli death caused by misoperation, thereby reducing the mining cost and shortening the leaching period.
(3) According to the invention, the surfactant is added in the acid leaching period, so that the solid-liquid contact angle between the leaching agent and the ore can be reduced, the spreading of the leaching solution on the surface of the ore is facilitated, and the flowing speed of the leaching solution on the surface of the ore is increased, so that the wetting effect of the leaching solution on the solid is enhanced. Meanwhile, the surfactant is added, so that the viscosity of the solution can be effectively reduced, and the problem of argillization in ore leaching is well reduced, so that the leaching rate of uranium is accelerated.
(4) According to the invention, by adding the surfactant, the hydrophilic group of the surfactant is deep into the leaching solution, and the hydrophobic group of the surfactant enters into the ore cracks, so that the pressure difference between the ore and the leaching solution which are originally balanced is changed, thereby facilitating the permeation of the leaching solution in the microcracks and improving the leaching rate of uranium. Meanwhile, the surfactant also enhances the concentration gradient of the surface of the ore, accelerates the processes of molecular diffusion and convection diffusion, and prevents the channel blockage caused by the migration of fine particles, thereby improving the leaching rate of the ore.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
The present invention is described in further detail below with reference to specific embodiments.
Example 1
A low-concentration sulfuric acid synergistic biological in-situ leaching uranium mining method comprises the following steps:
s1, pumping underground water of the ore bed, injecting the pumped underground water into the ore bed, and circularly dredging the ore bed through the underground water for 20 days;
s2, after the circulation of the underground water is finished, injecting oxygen into the underground water as an oxidant until the oxygen reaches the maximum saturated solubility in the water; simultaneously adding 0.4g/L of dilute sulfuric acid and 0.05 wt% of fatty alcohol-polyoxyethylene ether sulfosuccinic acid monoester disodium surfactant serving as a leaching agent into underground water, keeping the pH value of the leaching agent at 3-4, and stopping adding the dilute sulfuric acid and the surfactant when the pH value of the leaching agent is less than or equal to 2.0;
wherein, at the initial stage of leaching, the oxygen injection concentration is 450 mg/L; when the residual oxygen concentration in the leaching solution reaches 15mg/L, the oxygen injection concentration is reduced to 300mg/L, and when the leaching rate reaches 65%, the oxygen injection is stopped;
s3, adding domesticated thiobacillus ferrooxidans bacterial liquid as a leaching agent into underground water, and finishing bacterial leaching when the uranium concentration of a leaching solution is lower than 5 mg/L;
the concentration of the domesticated thiobacillus ferrooxidans bacterial liquid is 1.0 multiplied by 106More than one strain/mL, and the addition amount of the bacterial liquid is 15L/(m)2·h)；
S4, leaching uranium metal by leaching solution, and carrying out complexation reaction on the leaching solution and hexavalent uranium in the ore to form [ UO2(CO3)3]4-And [ UO2(CO3)3]2-When the uranium concentration in the leachate is more than 300mg/L, pumping out the leachate by using a submersible pump;
s5, resin adsorption, and adopting D231YT strong-base anion exchange resin; the mass exchange capacity of the D231YT strong-base anion exchange resin is 3.7mmol/g, the granularity is 0.63-1.40 mm, the wet apparent density is 0.70g/ml wet R, and the infiltration grinding ball rate is more than or equal to 90%.
Examples 2 to 5
Examples 2 to 5 provide a method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms, which is different from example 1 in that the concentration of the surfactant in step S2 is changed, and the operations are the same except for the above differences, and are not described again; the results of the specific condition parameters and the leaching rate of uranium are shown in the following table.
| Examples | Surfactant concentration (wt%) | Leaching rate (%) |
| 1 | 0.05 | 89.65 |
| 2 | 0 | 75.43 |
| 3 | 0.01 | 83.72 |
| 4 | 0.1 | 90.07 |
| 5 | 0.15 | 81.58 |
Comparing the results in the table, it can be seen that the change of the dosage of the surfactant in the acid leaching process in step S2 has a significant effect on the leaching rate of in-situ leaching uranium mining, and the comparison of the results in example 1 and example 2 shows that the invention can significantly improve the leaching rate of ore by adding the surfactant in the acid leaching period, and as the dosage of the surfactant increases, the leaching rate of ore increases and then decreases, and when the dosage of the surfactant is 0.05 wt%, the leaching rate tends to be the maximum. Therefore, in view of the above, the surfactant is preferably used in an amount of 0.05 wt%. The reason is that in the acid leaching process, a small amount of surfactant is added, which is beneficial to reducing the solid-liquid contact angle between the leaching agent and the ore and is beneficial to spreading the leaching solution on the surface of the ore, so that the flowing speed of the leaching solution on the surface of the ore is increased, and the wetting effect of the leaching solution on the solid is enhanced. Meanwhile, the surfactant is added, so that the viscosity of the solution can be effectively reduced, and the problem of argillization in ore leaching is well reduced, so that the leaching rate of uranium is accelerated; meanwhile, the hydrophilic group of the surfactant can be deeply inserted into the leaching solution, and the hydrophobic group enters into the ore cracks, so that the originally balanced pressure difference between the ore and the leaching solution is changed, the leaching solution can be permeated in the microcracks, and the leaching rate of uranium is improved. Meanwhile, the surfactant also enhances the concentration gradient of the surface of the ore, accelerates the processes of molecular diffusion and convection diffusion, and prevents the channel blockage caused by the migration of fine particles, thereby improving the leaching rate of the ore.
Examples 6 to 9
Examples 6 to 9 provide a method for in-situ leaching uranium mining by using low-concentration sulfuric acid in cooperation with a biological source, which is different from example 1 in that the concentration of the dilute sulfuric acid added in step S2 is changed, and the operations are the same except for the above differences, and are not described again; the results of the specific condition parameters and the leaching rate of uranium are shown in the following table.
| Examples | Dilute sulfuric acid concentration (g/L) | Leaching rate (%) |
| 6 | 0 | 71.36 |
| 7 | 0.3 | 85.92 |
| 8 | 0.5 | 86.19 |
| 9 | 0.6 | 79.23 |
From the results in the table, it can be seen that the in-situ leaching rate of uranium is significantly affected by changing the concentration of the dilute sulfuric acid in step S2, and from the results of comparative example 1 and example 6, the leaching rate of uranium can be significantly improved by using low-concentration sulfuric acid and surfactant in cooperation with thiobacillus ferrooxidans. This is because in the early stage of leaching, acidification can rapidly consume good acid substances in the ore, so as to facilitate leaching of uranium in the ore and simultaneously provide a suitable acidic environment for in-situ growth and leaching of the subsequent thiobacillus ferrooxidans. However, when the amount of the sulfuric acid is too high, the thiobacillus ferrooxidans can die, so that the leaching activity of the thiobacillus ferrooxidans is reduced, and the leaching of uranium in ore is not facilitated.
Examples 10 to 13
Examples 10 to 13 provide a method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms, which is different from example 1 in that the addition amount of the bacterial liquid in step S3 is changed, and the operations are the same except for the above differences, and are not described herein again; the results of the specific condition parameters and the leaching rate of uranium are shown in the following table.
| Examples | Bacterial liquid addition (L/(m)2·h)) | Leaching rate (%) |
| 10 | 0 | 74.51 |
| 11 | 10 | 82.76 |
| 12 | 20 | 87.59 |
| 13 | 25 | 80.02 |
As can be seen from the results of comparing example 1 with examples 10 to 13, changing the amount of the thiobacillus ferrooxidans bacterial liquid added in step S3 has a significant effect on the in-situ leaching rate of uranium, and as the amount of the bacterial liquid added increases, the leaching rate of uranium increases first and then decreases, and the leaching rate of uranium is the best in the case of the amount of the bacterial liquid used in example 1. As is clear from the results of comparing examples 1, 11 to 12 and 10, the present invention utilizes Fe in ore by using Thiobacillus ferrooxidans in combination with low-concentration sulfuric acid and surfactant2+As energy source substance for growth and reproduction, sulfuric acid and Fe are produced by catalytic oxidation3+So as to selectively dissolve and leach the uranium in the ore body, thereby improving the leaching rate of the uranium.
Examples 14 to 18
Examples 14 to 18 provide a method for in-situ uranium mining by synergistic biological in-situ leaching of low-concentration sulfuric acid, which is different from example 1 in that the oxygen injection concentration in step S2 is changed, and the operations are the same except for the above differences, and are not described herein again; the results of the specific condition parameters and the leaching rate of uranium are shown in the following table.
| Examples | Oxygen injection concentration (mg/L) | Leaching rate (%) |
| 14 | 0 | 73.12 |
| 15 | 300 | 78.45 |
| 16 | 400 | 83.46 |
| 17 | 500 | 87.09 |
| 18 | 600 | 84.31 |
Comparing the results of example 1 with examples 14 to 18, it is clear that changing the oxygen injection concentration in step S2 has a significant effect on the in-situ leaching rate of uranium. Comparing the results of examples 1, 15 to 18 and 14, it is found that the leaching rate of uranium is significantly improved by introducing oxygen before leaching. This is because Thiobacillus ferrooxidans is an aerobic bacterium and can depend on Fe in ore under the condition of trace oxygen2+As energy material for growth and reproduction, and maintains high bioleaching activity to make Fe2+Catalytic oxidation to sulfuric acid and Fe3+And the oxidation-reduction potential of the leaching agent is improved, and the leaching environment and the leaching performance of the uranium ore are improved, so that the tetravalent uranium in the ore is oxidized into hexavalent uranium for leaching.
Example 19
Example 19 provides a low concentration sulphuric acid synergistic bioleaching uranium mining method in situ, compared with example 1, except that in step S2, coco monoethanolamide disodium sulfosuccinate is used as the surfactant, and the operations are the same except for the above differences, which are not repeated herein.
In this example, the leaching rate of uranium is 86.14%, which shows that changing the type of the surfactant affects the in-situ leaching rate of uranium in uranium ore. The surfactant can reduce the surface tension of the leaching agent, so that the leaching agent is spread on the surface of the ore, the contact area of the ore and the leaching agent is increased, and the reaction is more sufficient. The surface tension of the leaching solution can be reduced better after the surfactant fatty alcohol polyoxyethylene ether sulfosuccinic acid monoester disodium is added than the coconut monoethanolamide sulfosuccinic acid monoester disodium, so that the leaching effect of promoting uranium is better.
While the invention has been described with respect to specific embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention; those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and alterations of the above embodiments according to the spirit and techniques of the present invention are also within the scope of the present invention.
Claims (8)
1. A low-concentration sulfuric acid synergistic biological in-situ leaching uranium mining method is characterized by comprising the following steps:
s1, pumping underground water of the ore bed, injecting the pumped underground water into the ore bed, and circularly dredging the ore bed through the underground water for 20 days;
s2, after the circulation of the underground water is finished, injecting oxygen into the underground water as an oxidant until the oxygen reaches the maximum saturated solubility in the water; meanwhile, dilute sulfuric acid and a surfactant are added into underground water to serve as a leaching agent, the pH value of the leaching agent is kept between 3 and 4, and the dilute sulfuric acid and the surfactant are stopped being added when the pH value of the leaching agent is less than or equal to 2.0;
s3, adding domesticated thiobacillus ferrooxidans bacterial liquid as a leaching agent into underground water, and finishing bacterial leaching when the uranium concentration of a leaching solution is lower than 5 mg/L;
s4, leaching uranium metal by leaching solution, and carrying out complexation reaction on the leaching solution and hexavalent uranium in the ore to form [ UO2(CO3)3]4-And [ UO2(CO3)3]2-When the uranium concentration in the leachate is more than 300mg/L, pumping out the leachate by using a submersible pump;
s5, resin adsorption, and D231YT strong base anion exchange resin is adopted.
2. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms according to claim 1, wherein the addition mode of the dilute sulfuric acid in the step S2 is as follows: adding dilute sulfuric acid into the main injection pipeline, monitoring pH value of the leaching solution, adjusting the injection amount of dilute sulfuric acid according to the pH value of the leaching solution, and sampling and monitoring the leaching solution U, HCO3 -、Cl-、Ca2+、Mg2+、SO4 2-The change of the residual oxygen and the change of the single-hole injection amount.
3. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms according to claim 1, wherein in the step S2, in the initial stage of leaching, the oxygen injection concentration is 400-500 mg/L; when the residual oxygen concentration in the leaching solution reaches 15mg/L, the oxygen injection concentration is reduced to 300mg/L, and when the leaching rate reaches 65%, the oxygen injection is stopped.
4. The method for in-situ leaching of uranium from low-concentration sulfuric acid synergistic organisms according to claim 1, wherein in step S2, the surfactant is one or a combination of fatty alcohol polyoxyethylene ether disodium sulfosuccinate or disodium cocomonoethanolamide sulfosuccinate monoester.
5. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms according to claim 1 or 3, wherein the concentration of the surfactant is 0.01-0.1 wt%.
6. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms according to claim 1, wherein the addition concentration of the dilute sulfuric acid is 0.3-0.5 g/L.
7. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organisms according to claim 1, wherein in the step S3, the concentration of the domesticated thiobacillus ferrooxidans bacterial liquid is 1.0 x 106More than one strain/mL, and the addition amount of the bacterial liquid is 10-20L/(m)2·h)。
8. The method for in-situ leaching uranium mining by low-concentration sulfuric acid synergistic organism as claimed in claim 1, wherein in step S4, the D231YT strong-base anion exchange resin has a mass exchange capacity of 3.7mmol/g, a particle size of 0.63-1.40 mm, a wet apparent density of 0.70g/ml wet R, and a percolation ball rate of not less than 90%.
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