Uranium-containing ore pulp efficient electro-Fenton activation leaching material based on peat and pyrite and activation method

Abstract

The invention provides a uranium-containing ore pulp efficient electro-Fenton activation leaching material based on peat and pyrite and an activation method, and belongs to the fields of inorganic nanometer material application and uranium purification and conversion. According to the leaching material, woody peat and natural pyrite particles are subjected to ball milling, so that uniform mixed powder is obtained, then reaction is conducted under the hydrothermal condition, steam chambering and activating treatment is conducted under the high-temperature condition, and the modified peat-pyrite iron-containing nano composite material with good catalytic activity is prepared; the material can effectively promote generation of an oxidizing agent in an electro-Fenton reaction, so that oxidation and dissolution of uranium are accelerated, U (IV) in uranium ore is rapidly converted into U (VI) with higher mobility, and the material has the advantages of being high in uranium resource recovery rate, small in environmental pollution, economical, applicable and the like, is suitable for efficient activation of uranium-containing ore pulp and has good application prospects. And an effective scheme is provided for sustainable development of uranium resources.

Description

Technical Field

[0001] The invention belongs to the field of inorganic nanomaterial application and uranium purification and conversion, and relates to a high-efficiency electro-Fenton activation leaching of iron-containing nanomaterials and an activation method based on peat and pyrite-containing uranium slurry. Background Art

[0002] With the growing global demand for nuclear energy, the development and utilization of uranium resources has become crucial. However, the processing of many uranium resources remains a significant challenge. Early hard-rock uranium mines were primarily mined underground, using agitation leaching or heap leaching to extract uranium. The mining process generated hazardous waste, such as uranium-containing wastewater, which inevitably posed environmental risks and harmed human health. With the country's increasing emphasis on environmental protection, hard-rock uranium mines have been gradually shut down. The focus of natural uranium mining has gradually shifted to sandstone uranium deposits. Sandstone uranium deposits, due to their excellent permeability, allow for highly efficient extraction using in situ leaching techniques. However, traditional uranium leaching techniques typically rely on acid or alkaline leaching, which requires high chemical consumption and may pose environmental risks. In recent years, electro-Fenton technology has gradually attracted research attention as a potential alternative to uranium leaching due to its high efficiency in treating industrial wastewater and soil remediation. Summary of the Invention

[0003] In view of this, and to address the above-mentioned technical problems, the present invention provides a highly efficient electro-Fenton activation leaching material and method for uranium-containing slurries, specifically for electro-Fenton leaching of uranium ores. Existing biochar / hydrothermal carbon is mostly obtained by pyrolyzing biomass such as straw under high-temperature conditions (usually above 300°C) in the absence of oxygen. Its structure is highly graphitized, and due to the high-temperature deoxygenation reaction, it generally lacks active oxygen-containing functional groups, resulting in a highly hydrophobic surface. This characteristic enables high electron transfer efficiency in the Fenton reaction, but due to the low number of oxygen-containing functional groups, it generally lacks electron donation capacity. Furthermore, existing hydrothermal carbon is typically obtained by hydrothermal reaction of carbonaceous feedstocks such as municipal sludge / glucose. While it exhibits good surface hydrophilicity and a high content of active oxygen-containing functional groups, it generally lacks a high degree of graphitization, resulting in low electron transfer efficiency. Therefore, conventional hydrothermal carbon generally serves as a good electron donor in the Fenton reaction.

[0004] Peat is an intermediate product in the process of the transformation of ancient higher plants into coal in the earth's crust. During its evolution, it is affected by the earth's crust pressure and temperature, and its graphitization degree is higher than that of ordinary biomass. Moreover, due to its extremely diverse internal composition, it has rich oxygen-containing functional groups. This enables it to have the potential to simultaneously serve as an electron donor and an electron shuttle in the Fenton reaction of iron-containing minerals. After a certain degree of modification, its original surface hydrophobicity is greatly reduced, and its own graphitization degree can also be increased again. Therefore, multiple mechanisms can act together during the Fenton reaction of iron-containing minerals. In addition, the pore expansion treatment of the material by water vapor (also known as water vapor activation) can generate oxidizing substances through the chemical reaction between water vapor and the carbon material. These substances further act on the material surface, resulting in the formation or expansion of pores. The material treated by this method can have a higher specific surface area and a richer pore structure. Therefore, by compounding and modifying peat and pyrite, the prepared material has rich electron supply, efficient electron transfer performance, a higher specific surface area and a rich pore structure, which can significantly improve the decomposition efficiency of oxidants and the generation efficiency of reactive oxygen species, accelerate the uranium ore leaching process, and achieve the efficient recovery of uranium resources. This new material provides an innovative solution for low-cost and low-pollution uranium ore treatment technologies and has high industrial application potential. The key of the present invention lies in the composite material based on peat and pyrite, which can significantly improve the efficiency of the electro-Fenton oxidation reaction and achieve the efficient leaching and recovery of uranium. Moreover, pyrite will release sulfate ions during the reaction, which is also beneficial for the activated uranyl ions to form uranyl sulfate complexes with them, change their surface electricity, destroy the original binding structure of uranium ore, so as to achieve the efficient separation of uranium from the original complex inclusion, and its efficient separation on the electrode can be realized through the action of an electric field.

[0005] To achieve the above object, the following technical solutions are adopted: A preparation method of a high-efficiency electro-Fenton activation leaching material for uranium-containing pulp based on peat and pyrite, comprising: Ball-milling peat and natural pyrite particles to obtain a uniform mixed powder, subjecting the obtained mixed powder to a hydrothermal reaction to obtain a slurry-like product, drying, grinding and sieving to obtain a powdery product; then putting the obtained powdery product into a tubular furnace, introducing water vapor and performing secondary heat treatment. At this stage, water vapor reacts with peat to generate CO and H2, causing new micropores and mesopores to form on the material surface; after cooling, a high-efficiency electro-Fenton activation leaching material for uranium-containing pulp based on peat and pyrite is obtained.

[0006] Further, the mass ratio of the peat to the natural pyrite is 1:9 to 9:1; the rotation speed of the ball milling is 300 to 900 rpm; the temperature of the hydrothermal reaction is 140 to 220 °C; the temperature of the secondary heat treatment is 800 to 1200 °C, and the treatment time is 1 to 4 hours.

[0007] Further, the peat includes woody peat, herbaceous peat, and moss peat.

[0008] Further, the activated leaching material is prepared by the preparation method according to any one of claims 1-3.

[0009] An extraction method of a highly efficient electro-Fenton activated leaching material for uranium-containing ore pulp based on peat and pyrite, comprising: Placing the uranium-containing ore pulp in a reactor, and adding the leaching material as an activator; Adding hydrogen peroxide to the pulp; By applying an electric field to stimulate the electro-Fenton reaction to generate highly reactive oxygen species, after oxidizing the uranium in the uranium-containing ore pulp; separating the leaching solution containing soluble U(VI) from the reaction pulp by solid-liquid separation, and analyzing the uranium concentration in the solid residue and the leaching solution by ICP-MS, and calculating the leaching rate of uranium.

[0010] Further, the electric field is applied in the form of direct current, the voltage range is 0.1 V to 5 V, and the current range is 0.1 A to 5 A.

[0011] Further, the concentration of H2O2 in the uranium-containing ore pulp is 0.1-10 mmol / L.

[0012] Further, the dosage of the leaching material is 0.05-5 g / L.

[0013] Further, the concentration of the uranium-containing ore pulp is 1-100 g / L; the activation reaction time is 5 to 240 min.

[0014] Further, the application of any of the above activation methods in the leaching and uranium extraction of uranium ore.

[0015] Beneficial effects: The beneficial effects of the present invention are as follows: The present invention enhances the activity of the electro-Fenton reaction by using the modified peat and pyrite composite material, and effectively generates highly reactive oxygen species (such as hydroxyl radical HO • and superoxide radical O2 •-), accelerating the oxidation of U(IV) in the uranium-containing pulp and improving the leaching efficiency and recovery rate of uranium. Compared with the traditional acid leaching method, the uranium oxidation leaching in the present invention is realized by electro-Fenton activation, which not only reduces the usage amount of acid, but also reduces the release of heavy metals and other pollutants, thus reducing the impact on the environment. Since pyrite is oxidized to release sulfate ions during the uranium leaching process, it 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 electric property of uranyl ions, and promoting their release from the ore, which 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 realizing the effective separation of uranium from impurities and improving the purity of uranium. By optimizing the electric field strength, H2O2 concentration and activator dosage, the present invention effectively reduces the power consumption and reagent dosage, makes the leaching process more economical, reduces the treatment cost, and is applicable to the exploitation and recovery of large-scale uranium ore resources. In addition, the prepared modified peat-pyrite composite material of the present invention has good structural stability, can maintain its activity during the reaction process, has the potential for regeneration and reuse, helps to reduce the consumption of materials and extend the service life of materials. Therefore, this material and method are applicable to various types of uranium-containing ores, providing a new solution for the efficient development of uranium ores and having broad application prospects. Description of the Drawings

[0016] Figure 1 It is the X-ray diffraction (XRD) pattern of the leaching materials with different ratios in the embodiment of the present invention. Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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. Those without specific conditions noted in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments without the manufacturer noted are all conventional products that can be obtained through commercial purchase.

[0018] Example 1: A high-efficiency electro-Fenton activation leaching material and method for uranium-containing pulp based on peat and pyrite: Mix peat and natural pyrite particles in a mass ratio of 9:1, carry out ball milling at a rotational speed of 900 rpm to obtain a uniform mixed powder. Subject the obtained mixed powder to a hydrothermal reaction at 220 °C to obtain a product. Dry, grind and sieve the product. Put the obtained powdered product into a tubular furnace, introduce steam and conduct a secondary heat treatment at 800 °C for 1 hour. After cooling, a 10% Py-HTP pyrite-hydrothermally modified peat composite leaching material can be obtained.

[0019] The test ore is 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. Crush the uranium ore to 200 mesh and prepare a uranium-containing pulp with a concentration of 10 g / L. Add the composite leaching material to the pulp, with the concentration of the composite leaching material in the pulp being 0.25 g / L, and then add hydrogen peroxide; make the concentration of hydrogen peroxide in the pulp be 10 mmol / L, mix evenly, turn on the power supply, apply an electric field (current 1.5 A, voltage 2 V), and conduct an electro-Fenton reaction. Set the reaction time to 30 minutes. After the reaction is completed, collect the ore liquid and residue, and analyze the uranium concentration by ICP-MS respectively. Under the experimental conditions, the leaching rate of uranium reaches 87%.

[0020] Example 2: A high-efficiency electro-Fenton activation leaching material and method for uranium-containing pulp based on hydrothermally modified peat and pyrite: Mix peat and natural pyrite particles in a mass ratio of 3:7, carry out ball milling at a rotational speed of 600 rpm to obtain a uniform mixed powder. Subject the obtained mixed powder to a hydrothermal reaction at 180 °C to obtain a product. Dry, grind and sieve the product. Put the obtained powdered product into a tubular furnace, introduce steam and conduct a secondary heat treatment at 850 °C for 1.5 hours. After cooling, a 30% Py-HTP pyrite-hydrothermally modified peat composite leaching material can be obtained.

[0021] The test ore is 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. Crush the uranium ore to 200 mesh and prepare a uranium-containing pulp with a concentration of 5 g / L. Add the composite leaching material to the pulp, with the concentration of the composite leaching material in the pulp being 0.1 g / L, and then add hydrogen peroxide; make the concentration of hydrogen peroxide in the pulp be 2 mmol / L, mix evenly, apply an electric field (current 1.0 A, voltage 1.5 V), and conduct an electro-Fenton reaction. Set the reaction time to 60 minutes. After the reaction is completed, collect the ore liquid and residue, and analyze the uranium concentration by ICP-MS respectively. Under the experimental conditions, the leaching rate of uranium reaches 81%.

[0022] Example 3: A High-efficiency Electro-Fenton Activation Leaching Material and Method for Uranium-containing Ore Slurry Based on Hydrothermally Modified Peat and Pyrite Mix peat and natural pyrite particles in a mass ratio of 1:1, carry out ball milling at a rotation speed of 300 rpm to obtain a uniform mixed powder. Subject the obtained mixed powder to a hydrothermal reaction at 160 °C to obtain a product. Dry, grind and sieve the product. Put the obtained powdered product into a tube furnace, introduce steam and carry out secondary heat treatment at 900 °C for 2 hours. After cooling, a 50% Py-HTP pyrite-hydrothermally modified peat composite leaching material can be obtained.

[0023] The test ore is 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. Crush the uranium ore to 200 mesh and prepare a uranium-containing ore slurry with a concentration of 5 g / L. Add the composite leaching material to the ore slurry, and the concentration of the composite leaching material in the ore slurry is 0.05 g / L. Then add hydrogen peroxide so that the concentration of hydrogen peroxide in the ore slurry is 0.5 mmol / L. Mix evenly, apply an electric field (current 0.5 A, voltage 1 V), carry out an electro-Fenton reaction, and set the reaction time to 90 minutes. After the reaction is completed, collect the ore liquid and residue, and analyze the uranium concentration by ICP-MS respectively. Under the experimental conditions, the leaching rate of uranium reaches 75%.

[0024] Example 4: A High-efficiency Electro-Fenton Activation Leaching Material and Method for Uranium-containing Ore Slurry Based on Hydrothermally Modified Peat and Pyrite Mix peat and natural pyrite particles in a mass ratio of 7:3, carry out ball milling at a rotation speed of 300 rpm to obtain a uniform mixed powder. Subject the obtained mixed powder to a hydrothermal reaction at 160 °C to obtain a product. Dry, grind and sieve the product. Put the obtained powdered product into a tube furnace, introduce steam and carry out secondary heat treatment at 950 °C for 2.5 hours. After cooling, a 70% Py-HTP pyrite-hydrothermally modified peat composite leaching material can be obtained.

[0025] The test ore is taken from a sandstone uranium deposit in the Songliao Basin (uranium grade is 0.043%), showing a nodular shape and associated with a large amount of uraninite, phosphuranite, pyrite and sphalerite. Crush the uranium ore to 200 mesh and prepare a uranium-containing ore slurry with a concentration of 5 g / L. Add the composite leaching material to the ore slurry, and the concentration of the composite leaching material in the ore slurry is 0.05 g / L. Then add hydrogen peroxide so that the concentration of hydrogen peroxide in the ore slurry is 0.5 mmol / L. Mix evenly, apply an electric field (current 0.75 A, voltage 1.25 V), carry out an electro-Fenton reaction, and set the reaction time to 100 minutes. After the reaction is completed, collect the ore liquid and residue, and analyze the uranium concentration by ICP-MS respectively. Under the experimental conditions, the leaching rate of uranium reaches 83%.

[0026] Example 5: A material and method for efficient electro-Fenton activation leaching of uranium-containing slurry based on hydrothermal modification of peat and pyrite: Peat and natural pyrite particles were mixed in a mass ratio of 9:1 and ball-milled at 300 rpm to obtain a uniform mixed powder. The resulting mixed powder was then subjected to a hydrothermal reaction at 160°C to obtain a product. The product was then dried, ground, and sieved. The resulting powder was placed in a tubular furnace, steamed, and subjected to a secondary heat treatment at 1000°C for 1 hour. After cooling, a 90% Py-HTP pyrite-hydrothermally modified peat composite leaching material was obtained.

[0027] The test ore was obtained from a hard rock uranium deposit in Shaoguan, Guangdong (uranium grade 0.104%). It primarily occurs in vein and block formations, accompanied by significant amounts of uraninite, hematite, pyrite, and calcite. The uranium ore was crushed to 200 mesh and prepared into a uranium-containing slurry at a concentration of 5 g / L. A composite leaching material was added to the slurry at a concentration of 0.05 g / L. Hydrogen peroxide was then added to a concentration of 0.5 mmol / L. After mixing, an electric field (current 1.0 A, voltage 0.75 V) was applied to the slurry for an electro-Fenton reaction of 120 minutes. After the reaction, the ore solution and residue were collected and analyzed for uranium concentration by ICP-MS. Under the experimental conditions, a uranium leaching yield of 75% was achieved.

[0028] like Figure 1 Shown are X-ray diffraction (XRD) patterns of leached materials with different proportions in the embodiments of the present invention.

[0029] Comparative Example 1: Preparation of the Py-biochar composite: 500 mg of Platycodon grandiflorum powder was heated in a tube furnace at 500°C for 3 hours. After cooling, the resulting biochar powder was removed. The biochar powder and natural pyrite particles were mixed in a mass ratio of 9:1 and ball-milled at 600-800 rpm to obtain a uniform mixed powder. The powder was then collected and ultrasonically mixed for 30 minutes to obtain the Py-biochar composite.

[0030] 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 Py-biochar composite material was added to the pulp, and the concentration of the Py-biochar composite material in the pulp was 0.25 g / L. Subsequently, hydrogen peroxide was added; the concentration of hydrogen peroxide in the pulp was 10 mmol / L. After mixing evenly, the power supply was started, an electric field was applied (current 1.5 A, voltage 2 V), and an electro-Fenton reaction was carried out. 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 was only about 43%.

[0031] Comparative Example 2: 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. Subsequently, hydrogen peroxide was added; the concentration of hydrogen peroxide in the pulp was 10 mmol / L. After mixing evenly, the power supply was started, an electric field was applied (current 1.5 A, voltage 2 V), and an electro-Fenton reaction was carried out. 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 was only 13.5%.

[0032] Comparative Example 3: 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 10% Py-HTP pyrite-modified peat 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, hydrogen peroxide was added; the concentration of hydrogen peroxide in the pulp was 10 mmol / L. After mixing evenly, an oxidation reaction was carried out. 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 was only 45%.

[0033] Comparative Example 4: The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%). The particles are fine, and a large amount of illite, kaolinite, calcite and potassium feldspar are associated. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. 10% Py-HTP pyrite-modified peat composite leaching material was added to the pulp, and the concentration of the composite leaching material in the pulp was 0.25 g / L. After mixing evenly, the power supply was started, and an electric field was applied (current 1.5 A, voltage 2 V), 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 was 0.

[0034] Comparative Example 5: The test ore was taken from a muddy sandstone uranium deposit in Inner Mongolia (uranium grade is 0.035%). The particles are fine, and a large amount of illite, kaolinite, calcite and potassium feldspar are associated. The uranium ore was crushed to 200 mesh and formulated into a uranium-containing pulp with a concentration of 10 g / L. Pyrite was added to the pulp to make the concentration of pyrite in the pulp 0.25 g / L, and then hydrogen peroxide was added; the concentration of hydrogen peroxide in the pulp was 10 mmol / L. After mixing evenly, the power supply was started, and an electric field was applied (current 1.5 A, voltage 2 V), 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 was 43%.

[0035] It can be seen that the pyrite-modified peat composite leaching material prepared in the embodiment of the present invention has a higher activation efficiency for uranium-containing pulp, and the gap with the comparative example is relatively obvious. The reason is that the surface-hydrophobic biochar particles cannot provide sufficient reaction sites for uranium activation, thus greatly reducing the activation effect of this method on uranium-containing pulp.

[0036] In summary, the present invention provides a high-efficiency electro-Fenton activation leaching material and activation method for uranium-containing pulp based on peat and pyrite, belonging to the technical field of uranium ore resource development; the leaching material of the present invention obtains a uniform mixed powder by ball-milling peat and natural pyrite particles, and then reacts under hydrothermal conditions to prepare a modified peat-pyrite composite material with good catalytic activity; this material can effectively promote the generation of oxidants in the electro-Fenton reaction, thereby accelerating the oxidation and dissolution of uranium, and quickly converting U(Ⅳ) in uranium ore into U(Ⅵ) with higher mobility. The present invention has the advantages of high uranium resource recovery rate, small environmental pollution, economic applicability, etc., and is suitable for the high-efficiency activation of uranium-containing pulp, providing an effective solution for the sustainable development of uranium resources.

[0037] As described above, this is not any form of limitation to the present invention. Although the present invention has been disclosed through 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 equivalent embodiments of equivalent changes within the scope of the technical solution of the present invention by using the technical content disclosed above. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to 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 an efficient electro-Fenton activated leaching material for uranium-containing pulp based on peat and pyrite, characterized in that, The preparation method includes: Ball-milling peat and natural pyrite particles to obtain a uniform mixed powder, subjecting the obtained mixed powder to hydrothermal reaction to obtain a slurry-like product, drying, grinding and pulverizing, and sieving to obtain a powdery product; then putting the obtained powdery product into a tube furnace, introducing steam and performing secondary heat treatment. At this stage, steam reacts with peat to produce CO and H2, generating new micropores and mesopores on the material surface; after cooling, a highly efficient electro-Fenton activated leaching material based on peat and pyrite for uranium-containing ore pulp is obtained.

2. The preparation method of an efficient electro-Fenton activation leaching material for uranium-containing pulp based on peat and pyrite as described in claim 1, characterized in that, The mass ratio of the peat to the natural pyrite is 1:9 to 9:1; the rotation speed of the ball-milling is 300 to 900 rpm; the temperature of the hydrothermal reaction is 140 to 220 °C; the temperature of the secondary heat treatment is 800 to 1200 °C, and the treatment time is 1 to 4 hours.

3. The preparation method of an efficient electro-Fenton activated leaching material for uranium-containing pulp based on peat and pyrite as described in claim 1, characterized in that, The peat includes woody peat, herbaceous peat and moss peat.

4. An efficient electro-Fenton activated leaching material for uranium-containing pulp based on peat and pyrite, characterized in that, The activated leaching material is prepared by the preparation method according to any one of claims 1-3.

5. A leaching method for an efficient electro-Fenton activation leaching material of uranium-containing pulp based on peat and pyrite, characterized in that, The leaching method includes: Placing the uranium-containing ore pulp in a reactor and adding the leaching material as an activator; Adding hydrogen peroxide to the slurry; Exciting the electro-Fenton reaction by applying an electric field to generate highly reactive oxygen species. After oxidizing the uranium in the uranium-containing ore pulp, separating the leaching solution containing soluble U(VI) from the reaction slurry by solid-liquid separation, and analyzing the uranium concentrations in the solid residue and the leaching solution by ICP-MS to calculate the uranium leaching rate.

6. The leaching method according to claim 5, characterized in that, The electric field is applied in the form of direct current, the voltage range is 0.1 V to 5 V, and the current range is 0.1 A to 5 A.

7. The leaching method according to claim 5, characterized in that, The concentration of H2O2 in the uranium-containing ore pulp is 0.1-10 mmol / L.

8. The leaching method according to claim 5, wherein, The usage amount of the leaching material is 0.05-5 g / L.

9. The leaching method as described in claim 5, characterized in that, The concentration of the uranium-containing ore pulp is 1-100 g / L; the activation reaction time is 5 to 240 min.

10. Application of the activation method according to any one of claims 5-9 in uranium ore leaching for uranium extraction.

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