Uranium-containing ore pulp persulfate oxidation composite leaching material based on ferric salt and hydrothermal carbon and activation leaching method

Abstract

The invention provides a uranium-containing ore pulp persulfate oxidation composite leaching material based on ferric salt and hydrothermal carbon and an activation leaching method, and belongs to the field of inorganic nano material application and uranium purification and conversion. According to the persulfate activation and oxidation system based on the ferric salt and hydrothermal carbon composite leaching material, the synergistic effect of ferric salt and hydrothermal carbon in uranium-containing ore pulp is utilized, persulfate is activated to generate sulfate free radicals and hydroxyl free radicals with strong oxidizing property, U (IV) in uranium ore is effectively oxidized to soluble U (VI), and therefore the leaching efficiency of uranium is remarkably improved; iron-containing minerals generated in the treatment process of the ferric salt provide stable Fe < 2 + > / Fe < 3 + > circulation in the oxidation process, and hydrothermal carbon enhances the electron transfer efficiency, has hydrophobicity and is beneficial to solid-liquid separation after leaching; the method is suitable for low-grade or difficult-to-treat uranium ore resources, the utilization rate of the oxidizing agent is high, the leaching time is shortened, the cost is reduced, and a new technical method is provided for efficient development of uranium resources.

Description

Technical Field

[0001] The present invention belongs to the fields of application of inorganic nanomaterials and uranium purification and conversion, and relates to a persulfate oxidation composite leaching material based on iron salt and hydrothermal carbon for uranium-containing ore pulp and an activation leaching method. Background Art

[0002] Uranium is an important strategic resource and is widely used in the fields of nuclear energy, medicine, scientific research and industry. Uranium resources in China are mainly concentrated in hard rock-type uranium mines in the south and sandstone-type uranium mines in the north. Hard rock-type uranium mines are mainly mined underground, supplemented by open-pit mining. The in-situ leaching technology by blasting can achieve a leaching rate of over 70% for hard rock-type uranium mines, but there is a risk of environmental damage during the mining process. The heap leaching process is simple and has a low cost, and the leaching rate for hard rock-type uranium mines can reach 95%, but the leaching cycle is long. For sandstone-type uranium mines with good permeability, in-situ leaching is a good strategy, which can improve the mining efficiency while ensuring the uranium leaching rate. With the gradual depletion of high-grade uranium ore resources, the development of low-grade uranium ore and refractory argillaceous uranium ore resources has become the research focus. The mineral types in low-grade uranium ore and argillaceous uranium deposits are complex, the uranium content is low and mostly exists in the form of insoluble tetravalent uranium. Affected by the interference of other mineral reactions, the use of traditional acid leaching or alkali leaching processes weakens the permeability of the ore deposit, and the increase in the dosage of reagents will also lead to environmental risks, making it difficult to achieve efficient uranium leaching. To improve the uranium recovery rate, it is particularly important to develop new oxidation leaching technologies and catalytic materials. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a composite leaching material and an activation leaching method for uranium-containing pulp by persulfate oxidation based on iron salts and hydrothermal carbon, which can improve the leaching efficiency of uranium ore through the synergistic effect of the composite leaching material. Persulfate (such as sodium persulfate, potassium persulfate, etc.) is a strong oxidant that can oxidize tetravalent uranium to soluble hexavalent uranium under certain conditions, significantly improving the leaching efficiency of uranium. However, there are still some problems in the application of the persulfate oxidation leaching method: First, the activation effect of persulfate is poor and needs to be enhanced by means of a catalyst; second, the recycling efficiency of the reduction products during the oxidation process is not high, resulting in a large consumption of the oxidant; in addition, the solid-liquid separation effect formed during the leaching process is not ideal, increasing the subsequent treatment difficulty. Hydrothermal carbon is a carbon material prepared by hydrothermal reaction, which has good hydrophobicity and electron transfer performance, can promote the reduction cycle of iron oxides, and increase the utilization rate of the oxidant. However, it is also difficult to effectively improve the leaching efficiency of uranium ore only by the single action of hydrothermal carbon. Based on this, the present invention proposes a composite activation leaching material that combines iron salts with hydrothermal carbon. Through the co-hydrothermal reaction, the iron salts adsorbed on the surface of hydrothermal carbon react chemically with hydrothermal carbon under hydrothermal conditions to form iron-containing minerals (such as ferrihydrite, hematite, magnetite, jarosite, etc.), and a tight chemical bond is formed between the two. The electron transfer performance of hydrothermal carbon partially reduces the surface of the formed iron-containing minerals, forming abundant oxygen vacancies. These oxygen vacancies play an important role in improving the reaction activity of uranium ore leaching to enhance the oxidation of tetravalent uranium by persulfate. Hydrothermal carbon can provide electrons in the reaction system, quickly reducing the trivalent iron in the formed iron-containing minerals to divalent iron, thus forming a cyclic redox system. In addition, the hydrophobicity of hydrothermal carbon facilitates the solid-liquid separation between the material and the reaction system, facilitating subsequent treatment. Through the synergistic effect of the formed iron-containing minerals and the hydrothermal carbon composite material, the efficiency and resource utilization rate of the persulfate uranium ore leaching process can be effectively improved, which is applicable to the development of low-grade uranium ore and the efficient recovery of uranium resources. This method is applicable to the development and efficient recovery of low-grade uranium ore, realizes the effective activation and recycling of the oxidant, reduces resource consumption, and improves the recovery rate of uranium resources.

[0004] To achieve the above object, the following technical solutions are adopted: A preparation method of a composite leaching material for uranium-containing pulp by persulfate oxidation based on iron salts and hydrothermal carbon, comprising: Performing hydrothermal reaction on the hydrothermal carbon raw material to prepare hydrothermal carbon, then adding iron salts to the prepared hydrothermal carbon, fully stirring and mixing evenly, and then performing secondary hydrothermal treatment. After the iron salts are adsorbed on the surface of the hydrothermal carbon, iron-containing minerals are gradually formed, and the abundant electrons of the carbon material can partially reduce the surface of the formed iron-containing minerals to form oxygen vacancies, further improving the reaction performance of the material; freeze-drying and sieving the reaction product to obtain the composite leaching material for uranium-containing pulp by persulfate oxidation based on iron salts and hydrothermal carbon.

[0005] Further, the hydrothermal carbon is obtained by reacting 4 - 10 g of peat with 10 - 100 ml of ultrapure water in a hydrothermal reactor at 140 - 220 °C for 2 - 8 hours.

[0006] Further, the mass ratio of the hydrothermal carbon to the iron salt is 1:1 - 19:1; the secondary hydrothermal temperature of the iron salt and the hydrothermal carbon is 140 - 220 °C, and the time is 2 - 8 hours.

[0007] Further, the iron salts include ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, ferrous nitrate and other common iron salts; the hydrothermal carbon raw materials include glucose, peat, platycodon grandiflorum, rice husk, and municipal sludge.

[0008] Further, the leaching material is prepared by the preparation method of any one of claims 1 - 4.

[0009] A leaching method of a uranium-containing pulp persulfate oxidation composite leaching material based on iron salt and hydrothermal carbon, comprising: Mixing the uranium-containing pulp with the composite leaching material; Adding persulfate to the reaction system to oxidize tetravalent uranium in the uranium ore to hexavalent uranium; The hydrothermal carbon provides electrons to rapidly reduce trivalent iron to divalent iron, forming a cyclic redox system; After the reaction, the reaction solution and the remaining residue solid are collected; The uranium content in the collected solution and solid residue is measured by ICP-MS, and the uranium leaching rate is calculated therefrom.

[0010] Further, the persulfate is at least one of sodium persulfate, potassium monopersulfate, potassium persulfate and ammonium persulfate, and the concentration of the persulfate in the uranium-containing pulp is 1 - 10 mmol / L.

[0011] Further, the usage amount of the leaching material is 0.1 - 5 g / L.

[0012] Further, the concentration of the uranium-containing pulp is 5 - 100 g / L; the activation reaction time is 10 - 240 min Further, the application of any one of the above activation methods in the leaching of uranium ore for uranium extraction.

[0013] Beneficial effects: The beneficial effects of the present invention are as follows: Through the synergistic effect of the iron-containing mineral and the hydrothermal carbon, the present invention effectively stimulates the persulfate to generate strongly oxidizing sulfate radicals (SO4 •⁻ ), and hydroxyl radicals (HO •), which can oxidize insoluble tetravalent uranium into soluble hexavalent uranium. Compared with traditional methods, it significantly improves the leaching efficiency of uranium and is suitable for treating low-grade uranium ores. During the uranium leaching process, the oxidation process of persulfate can release a large amount of sulfate ions, which is beneficial for the uranyl ions (UO2 2+ formed after the oxidation of U(IV) to combine with them to form uranium sulfate complexes (such as UO2(SO4)2 2- ), thereby increasing the solubility of uranium, changing the surface electrical properties of uranyl ions, and promoting their release from the ore. This is particularly beneficial for the efficient leaching of some uranium ores containing argillaceous minerals (such as argillaceous sandstone-type uranium ores and carbonaceous siliceous shale-type uranium ores). In addition, during the uranium leaching process, sulfate can also promote some impurity elements (such as calcium and magnesium, etc.) to form insoluble salts with sulfate, thereby achieving the effective separation of uranium and impurities and improving the purity of uranium. Hydrothermal carbon is a carbon material prepared by hydrothermal reaction, which has good hydrophobicity and electron transfer properties, can promote the reduction cycle of iron oxides, and increase the utilization rate of oxidants. Hydrothermal carbon participates in the catalytic reaction of iron-containing minerals as an electron donor, helps to restore the iron ion cycle in iron-containing minerals, and forms an efficient redox system. The surface of the generated iron-containing minerals is rich in oxygen vacancies, and these oxygen vacancies provide more reactive sites, further improving the leaching efficiency of uranium. Through the synergistic effect of iron-containing minerals and hydrothermal carbon composites, the consumption of persulfate is reduced, the utilization rate of oxidants is significantly increased, thereby reducing the cost during the uranium leaching process. In addition, the hydrophobicity of hydrothermal carbon helps the solid-liquid separation after the reaction, makes the pulp filtration and subsequent treatment more efficient, reduces the uranium content in the residual liquid, helps to improve the final recovery rate of uranium, and simplifies the dehydration and purification processes. The iron-containing minerals and hydrothermal carbon composites have strong structural stability and can maintain long-term activity in the persulfate system, avoiding the degradation problem of traditional catalysts in oxidation reactions. Therefore, this composite leaching activation material is suitable for long-term and stable use, extending the service life of the material. Therefore, the present invention is not only suitable for high-grade uranium ores, but also suitable for difficult-to-treat mineral types such as argillaceous and low-degree oxidized uranium ores, expanding the available range of uranium ore resources and providing technical support for the development of low-grade uranium ores. Description of the Drawings

[0014] Figure 1 It is the X-ray diffraction (XRD) pattern of the leaching materials with different ratios in the embodiments of the present invention. Detailed Embodiments

[0015] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0016] Example 1: A method for preparing a composite leaching material and an activated leaching method for uranium-containing ore pulp based on iron salt and hydrothermal carbon: Hydrothermal carbon was prepared by hydrothermal reaction of 5 g of peat at 160 °C for 2 hours. Subsequently, 1 g of ferrous sulfate was dissolved in 20 mL of ultrapure water, and 5 g of the prepared hydrothermal carbon was added. After stirring evenly, secondary hydrothermal treatment was carried out at 160 °C for 2 hours. The reaction product was freeze-dried and sieved to obtain 1% Jrs-HTP hydrothermal carbon-ferrihydrite composite leaching material.

[0017] The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade was 0.035%), with fine particles and associated with a large amount of illite, kaolinite, calcite and potassium feldspar. The uranium ore was crushed to 200 mesh and formulated into uranium-containing ore pulp with a concentration of 10 g / L. 1% Jrs-HTP hydrothermal carbon-ferrihydrite composite leaching material was added to the ore pulp, and the concentration of the composite leaching material in the ore pulp was 0.5 g / L. Subsequently, a sodium persulfate solution was added to make the concentration of persulfate 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 30 minutes. After the reaction, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under the experimental conditions, the leaching rate of uranium reached 82%.

[0018] Example 2: A method for preparing a composite leaching material and an activated leaching method for uranium-containing ore pulp based on iron salt and hydrothermal carbon: Hydrothermal carbon was prepared by hydrothermal reaction of 5 g of peat at 180 °C for 2.5 hours. Subsequently, 5 g of ferrous sulfate was dissolved in 20 mL of ultrapure water, and 5 g of the prepared hydrothermal carbon was added. After stirring evenly, secondary hydrothermal treatment was carried out at 180 °C for 2.5 hours. The reaction product was freeze-dried and sieved to obtain 13% Jrs-HTP hydrothermal carbon-ferrihydrite composite leaching material.

[0019] The test ore was taken from a sandstone uranium deposit in the Songliao Basin (uranium grade is 0.043%), occurring in nodular form, associated with a large amount of uraninite, autunite, pyrite and sphalerite. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 5 g / L. 13% Jrs-HTP hydrothermal carbon - jarosite composite leaching material was added to the pulp, and the concentration of the composite leaching material in the pulp was 0.25 g / L. Subsequently, a potassium monopersulfate solution was added to make the concentration of persulfate 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 60 minutes. After the reaction ended, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under the experimental conditions, the uranium leaching rate reached 87%.

[0020] Example 3: A persulfate oxidation composite leaching material and an activated leaching method for uranium-containing pulp based on iron salt and hydrothermal carbon: 5 g of peat was subjected to hydrothermal reaction at 200 °C for 3 hours to prepare hydrothermal carbon. Subsequently, 10 g of ferrous sulfate was dissolved in 20 mL of ultrapure water, and 5 g of the prepared hydrothermal carbon was added. After stirring evenly, secondary hydrothermal treatment was carried out at 200 °C for 2 hours. The reaction product was freeze-dried and sieved to obtain 35% Jrs-HTP hydrothermal carbon - jarosite composite leaching material.

[0021] The test ore was taken from a hard rock uranium deposit in the Shaoguan area of Guangdong (uranium grade is 0.104%), mainly occurring in vein and massive forms, associated with a large amount of uranophane, hematite, pyrite and calcite, etc. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 5 g / L. 35% Jrs-HTP hydrothermal carbon - jarosite composite leaching material was added to the pulp, and the concentration of the composite leaching material in the pulp was 0.1 g / L. Subsequently, a potassium persulfate solution was added to make the concentration of persulfate 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 120 minutes. After the reaction ended, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under the experimental conditions, the uranium leaching rate reached 77%.

[0022] Comparative Example 1: The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%), with fine particles, associated with a large amount of illite, kaolinite, calcite and potassium feldspar. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. Subsequently, a sodium persulfate solution was added to make the concentration of persulfate 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 30 minutes. After the reaction ended, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under the experimental conditions, the uranium leaching rate was 0.

[0023] Comparative Example 2: Hydrothermal carbon was prepared by subjecting 5 g of peat to hydrothermal reaction at 160 °C for 2 hours. Subsequently, 1 g of ferrous sulfate was dissolved in 20 mL of ultrapure water, and 5 g of the prepared hydrothermal carbon was added. After stirring well, the mixture was subjected to secondary hydrothermal treatment at 160 °C for 2 hours. The reaction product was freeze-dried and sieved to obtain a 1% Jrs-HTP hydrothermal carbon-goethite composite leaching material.

[0024] The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%), with fine particles and associated with a large amount of illite, kaolinite, calcite, and potassium feldspar. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. 5% Fhy-HTC hydrothermal carbon-iron salt composite leaching material was added to the pulp, and the concentration of the composite leaching material in the pulp was 0.5 g / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 30 minutes. After the reaction, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under these experimental conditions, the uranium leaching rate was 0.

[0025] Comparative Example 3: 5 g of peat was subjected to hydrothermal reaction at 160 °C for 2 hours to obtain a hydrothermal carbon material.

[0026] The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%), with fine particles and associated with a large amount of illite, kaolinite, calcite, and potassium feldspar. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. The hydrothermal carbon material was added to the pulp, and the concentration of the hydrothermal carbon material in the pulp was 0.5 g / L. Subsequently, a sodium persulfate solution was added to make the concentration of persulfate 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 30 minutes. After the reaction, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under these experimental conditions, the uranium leaching rate was 20%.

[0027] Comparative Example 4: 1 g of ferrous sulfate was dissolved in 20 mL of ultrapure water. After stirring well, it was subjected to secondary hydrothermal treatment at 160 °C for 2 hours. The reaction product was freeze-dried and sieved to obtain a hematite material (Hem), as shown in Figure 1 shown.

[0028] The test ore was taken from a pelitic sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%), with fine particles and associated with a large amount of illite, kaolinite, calcite and potassium feldspar. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. Hem was added to the pulp so that the concentration of Hem in the pulp was 0.5 g / L, and then a sodium persulfate solution was added so that the concentration of persulfate was 10 mmol / L. After mixing evenly, an oxidation reaction was carried out, and the reaction time was set to 30 minutes. After the reaction, the ore liquid and residue were collected, and the uranium concentration was analyzed by ICP-MS respectively. Under these experimental conditions, the leaching rate of uranium was 35%.

[0029] It can be seen that when the Jrs-HTP hydrothermal carbon-goethite composite leaching material prepared in the embodiment of the present invention is used together with persulfate, the activation efficiency of the uranium-containing pulp is higher, and the gap with the comparative example is relatively obvious, and the leaching rate of uranium reaches more than 75%.

[0030] It can be seen that when the Jrs-HTP hydrothermal carbon-goethite composite leaching material prepared in the embodiment of the present invention is used together with persulfate, the activation efficiency of the uranium-containing pulp is higher, and the gap with the comparative example is relatively obvious, and the leaching rate of uranium reaches more than 75%.

[0031] In summary, the present invention provides a persulfate oxidation composite leaching material and an activation leaching method for uranium-containing pulp based on iron salt and hydrothermal carbon, belonging to the technical field of uranium ore resource development; in the present invention, the persulfate activation oxidation system based on the iron salt and hydrothermal carbon composite leaching material utilizes the synergistic effect of iron-containing minerals and hydrothermal carbon in the uranium-containing pulp to activate persulfate to generate strongly oxidizing sulfate radicals and hydroxyl radicals, effectively oxidizing U(IV) in the uranium ore to soluble U(VI), thereby significantly improving the leaching efficiency of uranium; the iron-containing minerals rich in surface oxygen vacancies provide a stable Fe 2+ / Fe 3+ cycle, the hydrothermal carbon enhances the electron transfer efficiency and has hydrophobicity, which helps the solid-liquid separation after leaching; the present invention is applicable to low-grade or refractory uranium ore resources, with high utilization rate of oxidants, reducing the consumption of oxidants, shortening the leaching time and reducing the cost, providing a new technical method for the efficient development of uranium resources.

[0032] The above is not intended to limit the present invention in any form. Although the present invention has been disclosed by the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention when using the disclosed technical content. However, as long as the content does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A preparation method of a composite leaching material for oxidizing persulfate of uranium-containing pulp based on iron salt and hydrothermal carbon, characterized in that The preparation method includes: Hydrothermal carbon is prepared by subjecting hydrothermal carbon raw materials to hydrothermal reaction. Subsequently, iron salt is added to the prepared hydrothermal carbon. After thorough stirring and mixing, secondary hydrothermal treatment is carried out. The iron salt is adsorbed on the surface of the hydrothermal carbon and gradually forms an iron-containing mineral. Moreover, the abundant electrons of the carbon material can partially reduce the surface of the formed iron-containing mineral to form oxygen vacancies, further improving the reaction performance of the material. The reaction product is freeze-dried and sieved to obtain the uranium-containing ore pulp persulfate oxidation composite leaching material based on iron salt and hydrothermal carbon.

2. The preparation method of a persulfate oxidation composite leaching material for uranium-containing ore pulp based on iron salt and hydrothermal carbon as described in claim 1, characterized in that, The hydrothermal carbon is obtained by reacting 4 - 10 g of peat with 10 - 100 ml of ultrapure water in a hydrothermal reaction kettle at 140 - 220 °C for 2 - 8 hours.

3. The preparation method of a persulfate oxidation composite leaching material for uranium-containing ore pulp based on iron salt and hydrothermal carbon as described in claim 1, characterized in that, The mass ratio of the hydrothermal carbon to the iron salt is 1:1 - 19:1; the temperature of the secondary hydrothermal treatment of the iron salt and the hydrothermal carbon is 140 - 220 °C, and the time is 2 - 8 hours.

4. The preparation method of a persulfate oxidation composite leaching material for uranium-containing ore pulp based on iron salt and hydrothermal carbon as described in claim 1, characterized in that, The iron salt includes at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, ferrous nitrate, and other common iron salts; the hydrothermal carbon raw materials include at least one of glucose, peat, platycodon grandiflorum, rice husk, and municipal sludge.

5. A composite leaching material for persulfate oxidation of uranium-containing pulp based on iron salt and hydrothermal carbon, characterized in that, The leaching material is prepared by the preparation method according to any one of claims 1 - 4.

6. A leaching method of a composite leaching material for oxidizing persulfate of uranium-containing pulp based on iron salt and hydrothermal carbon, characterized in that, The leaching method includes: Mixing the uranium-containing ore pulp with the composite leaching material; Adding persulfate to the reaction system to oxidize tetravalent uranium in the uranium ore to hexavalent uranium; The hydrothermal carbon provides electrons to rapidly reduce trivalent iron to divalent iron, forming a cyclic redox system; After the reaction ends, the reaction solution and the remaining residue solid are collected; The uranium content in the collected solution and the solid residue is measured by ICP-MS, and the uranium leaching rate is calculated based on this.

7. The leaching method according to claim 6, characterized in that, The persulfate is at least one of sodium persulfate, potassium monopersulfate, potassium persulfate, and ammonium persulfate, and the concentration of the persulfate in the uranium-containing ore pulp is 1 - 10 mmol / L.

8. The leaching method according to claim 6, characterized in that, The usage amount of the leaching material is 0.1 - 5 g / L.

9. The leaching method according to claim 6, characterized in that, The concentration of the uranium-containing ore pulp is 5 - 100 g / L; the activation reaction time is 10 - 240 min.

10. Application of the activation method according to any one of claims 6 - 9 in uranium ore leaching for uranium extraction.

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