Treatment device and method for advanced oxidation activation of argillaceous sandstone type uranium deposit

Abstract

The invention provides a treatment device and method for advanced oxidation activation of argillaceous sandstone type uranium ore, and belongs to the field of manufacturing of other special equipment for uranium purification and conversion, uranium concentration and the like. Comprising a tank body, a dosing pump and jet nozzles, the outer wall of the top of the main body of the tank body is provided with a feed inlet and an access hole, the peripheral outer wall of the tank body is provided with the jet nozzles, an emptying pipe and a discharge hole, the dosing pump is connected with the jet nozzles, an oxidizing agent enters the tank body from the jet nozzles through the dosing pump, and jet flow provided by the jet nozzles is used for breaking surface films of ore particles. And the jet flow nozzle is also used for forming micro-nano bubbles of the oxidizing agent. According to the method, accurate feeding and uniform distribution of the oxidizing agent and the uranium leaching material are achieved, and the uranium leaching efficiency is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing other special equipment such as uranium purification and conversion, uranium enrichment, etc., and particularly relates to a treatment device and method for advanced oxidation activation of argillaceous sandstone-type uranium ore. Background Technique

[0002] Argillaceous sandstone-type uranium ore is an important type of uranium ore resource. The Nuheting uranium ore in the Erlian Basin is one of the largest uranium deposits in China at present, with a main resource volume of 30,000 tons. Among them, the main uranium minerals in argillaceous sandstone-type uranium ore are uraninite, brannerite, autunite, etc. There is also part of uranium that is often adsorbed on the surface of clay minerals or enriched in organic matter. Due to the complex mineral composition, fine particle size of uranium minerals, and poor oxidizability of this type of uranium, it is difficult to efficiently extract uranium through traditional physical or chemical methods. At present, the leaching process for sandstone-type uranium ore is in-situ leaching of uranium, which is divided into acid leaching, alkali leaching, and neutral leaching. The principle mainly relies on oxidants to oxidize tetravalent uranium (U(Ⅳ)) in uranium ore into hexavalent uranium (U(Ⅵ)) that is easily soluble in water, and then extract uranyl ions ( ). However, common oxidants such as hydrogen peroxide, sodium hypochlorite, and potassium permanganate in the existing process often react with other minerals in the ore deposit during the leaching process of argillaceous sandstone-type uranium ore, affecting the permeability of the ore layer, and there are problems such as low oxidation efficiency, high reagent consumption, and environmental pollution.

[0003] Minerals in argillaceous sandstone-type uranium ore that have a greater impact on the in-situ leaching process of uranium include clay minerals, iron minerals, carbonate minerals, sulfide minerals, and fine-grained argillaceous components. First of all, clay minerals can adsorb uranyl ions, reducing the solubility of uranium; secondly, divalent iron (Fe 2+ )in iron minerals is prone to react with oxidants, resulting in waste of oxidants and further reducing the oxidation efficiency of uranium. Thirdly, carbonate minerals will undergo alteration to form precipitates or gases under acidic conditions, which may cause blockage, and sulfides may form iron precipitates in alkaline leaching. All of the above will affect the permeability of the uranium ore-bearing layer, thereby affecting the in-situ leaching effect. Finally, the fine-grained argillaceous components in uranium ore are prone to wrap uranium minerals, making it difficult for uranium to contact the leaching agent. In addition, the increase in viscosity in the pulp also leads to poor fluidity and uneven distribution of oxidants during the reaction process, ultimately affecting the leaching effect. Moreover, argillaceous sandstone uranium ore contains more clay minerals, carbonates, iron oxides and other components. During the mineralization and deposition process, these minerals gradually deposit on the surface of ore particles, forming a dense film layer. The surface film reduces the direct contact area between the leaching solution and the ore surface, restricting the progress of the leaching reaction. The existing leaching methods often show the following limitations when treating argillaceous sandstone-type uranium ore:

[0004] 1. Difficult activation: Argillaceous minerals and fine-grained minerals hinder the direct contact between oxidants and uranium minerals, resulting in difficult oxidation reactions and low uranium leaching efficiency.

[0005] 2. Slow reaction rate: Due to the uneven dispersion of the oxidant in the pulp, the leaching reaction is incomplete, prolonging the reaction time and increasing energy consumption.

[0006] 3. High pulp viscosity: The clay component in argillaceous sandstone-type ores significantly increases the viscosity of the pulp, making it difficult for conventional stirring and spraying systems to achieve uniform mixing.

[0007] 4. High environmental risk: The large-dose use of traditional oxidants is likely to cause environmental pollution. Especially in the case of uneven reactions, the excessive use of oxidants may also bring secondary pollution. Summary of the Invention

[0008] The purpose of the present invention is to solve the defects existing in the above-mentioned prior art, and provide a treatment device and method for the advanced oxidation activation of argillaceous sandstone-type uranium ores, aiming to improve the problems of low reaction efficiency and insufficient utilization of oxidants during the uranium ore leaching process.

[0009] Based on the principle of catalytic advanced oxidation technology and combined with the Venturi effect homogeneous nozzle design, the present invention overcomes the problems of activating argillaceous sandstone-type uranium ores by optimizing the injection of oxidants and the mixing method of the pulp.

[0010] The present invention adopts the following technical solutions: A treatment device for the advanced oxidation activation of argillaceous sandstone-type uranium ores includes a tank body, a chemical dosing pump, and a jet nozzle. The outer wall of the top of the tank body main body has a feeding port and a maintenance port. The outer walls around the tank body have jet nozzles, a drain pipe, and a discharge port. The chemical dosing pump is connected to the jet nozzle. The oxidant enters the tank body from the jet nozzle through the chemical dosing pump. The jet provided by the jet nozzle is used to break the surface film of ore particles, and the jet nozzle is also used to form micro-nano bubbles of the oxidant.

[0011] It also includes a stirring motor located at the top of the tank body. The stirring motor is connected to a mechanical stirring paddle in the tank body through a stirring rod. The mechanical stirring paddle is made of titanium alloy or stainless steel.

[0012] The jet nozzle is used to enhance the turbulent state of the pulp and increase the contact area between uranium minerals and the oxidant. 8-12 nozzles are evenly distributed along the inner wall of the cylindrical tank body main body. Each jet nozzle has an angle of 10-90° with the inner wall of the tank body main body to ensure that the oxidant and bubbles flow spirally in the cavity. The material of the jet nozzle is made of polyurethane, nano-ceramics, polytetrafluoroethylene, titanium alloy, or 316L stainless steel, with corrosion resistance and strength.

[0013] The jet nozzle can adopt a Venturi jet nozzle, a conical jet nozzle, a narrow-angle jet nozzle, a linear jet nozzle, a mixing head jet nozzle, etc.

[0014] On the other hand, a treatment method for advanced oxidation activation of argillaceous sandstone-type uranium ore is also provided, including the following steps: Step 1. Crush the argillaceous sandstone-type uranium ore and mix it with an appropriate amount of water to prepare a slurry with a certain concentration.

[0015] Step 2. Add the slurry into the tank through the feed inlet, pump in the leaching agent using the leaching agent dosing pump, start the stirring motor, set a certain rotation speed, and uniformly mix the slurry.

[0016] Step 3. Start the dosing pump to add the oxidant, adjust it to a certain flow rate, and the oxidant and gas enter the tank through the Venturi jet nozzle to form micro-nano fine bubbles that fully contact the slurry. Utilize the catalytic advanced oxidation technology to generate hydroxyl radicals and superoxide radicals, and improve the activation and dissolution efficiency of uranium minerals.

[0017] Step 4. After the reaction is completed, collect the activated concentrated ore liquid from the discharge port and collect the remaining mineral residues from the drain pipe.

[0018] Step 5. Analyze the uranium concentration in the ore liquid and ore slag by ICP-MS, and calculate the leaching activation rate of the uranium ore.

[0019] Furthermore, precisely control the addition amounts of the oxidant and uranium leaching material through the dosing pump, and adjust the dosing rate in real time according to the slurry state.

[0020] Furthermore, precisely control the addition amounts of the oxidant and uranium leaching material through the dosing pump, and adjust the dosing rate in real time according to the slurry state.

[0021] Furthermore, the oxidant is any one of hydrogen peroxide, persulfate, percarbonate, and peracetic acid.

[0022] Furthermore, the leaching agent is any one of pyrite, magnetite, ferrihydrite, nano zero-valent iron, ferric sulfate, ferric nitrate, ferrous sulfate, ferrous nitrate.

[0023] Advantages of the present invention: (1). Argillaceous sandstone-type uranium ore usually contains a relatively high proportion of clay minerals and fine-grained mud, resulting in poor dispersion and difficult leaching of uranium in the ore. The mud component will form a colloid during the leaching process, increasing the difficulty of uranium leaching. Therefore, the presence of the mud component makes the uranium leaching efficiency low, and traditional leaching methods often fail to achieve an ideal recovery effect. In addition, the release of mud minerals may cause heavy metal pollution, affecting the safety of the surrounding environment and water resources. Therefore, due to the complexity of the reaction caused by the mud characteristics, the process control difficulty is increased, and the production cost is increased.

[0024] (2). The present invention significantly improves the leaching efficiency of uranium ore through innovative design. A jet nozzle is used to generate micro-nano bubbles, and mechanical stirring is used to assist the jet nozzle for uniform mixing, making the distribution of the oxidant in the pulp more uniform, thereby enhancing the mass transfer process of the reaction and reducing the waste of the oxidant. Combining the jet nozzle and mechanical stirring can significantly increase the oxidation rate of uranium. The powerful shock wave generated by the jet nozzle helps to break the surface film of the ore particles, exposing more active sites. At the same time, mechanical stirring ensures the contact between these active sites and the oxidant, thus accelerating the uranium leaching process. The jet nozzle generates a powerful flow impact force through the injection of high-pressure fluid, which can quickly and fully mix the activator and the pulp. Combining with mechanical stirring can form strong turbulence in the reaction cavity, improving the fluidity and mixing uniformity of the liquid. The dual stirring method ensures the uniform distribution of the oxidant in the pulp, making the oxidation reaction more complete.

[0025] (3). During the process of injecting fluid by the jet nozzle, a large number of tiny bubbles can be generated. Under the action of mechanical stirring, these bubbles can not only increase the oxidation reaction rate of uranium, but also extend the retention time of the bubbles in the liquid, increase the contact area between the bubbles and the liquid, and effectively promote the progress of the oxidation reaction. At the same time, iron-containing minerals or iron salts as leaching materials can efficiently drive the generation of reactive oxygen species such as HO • and O2 •- , accelerating the oxidation of uranium ore. In short, adopting the integrated method of the jet nozzle and mechanical stirring can achieve the expected oxidation activation effect with a lower dosage of chemical reagents, reduce the usage amount of chemical reagents, thereby reducing environmental pollution and meeting the requirements of green mining development.

[0026] (4). The device and method of the present invention are specifically aimed at argillaceous minerals and their characteristics, and effectively destroy the structure of the argillaceous through advanced oxidation treatment, promoting the release of uranium and improving the leaching efficiency of uranium. Compared with traditional uranium ore treatment methods, the device and process of the present invention have lower oxidant consumption, higher uranium leaching rate and better reaction stability. This efficient activation treatment method not only shows excellent performance in the field of resource extraction, but also makes a positive contribution to environmental protection. It is suitable for the efficient activation treatment of argillaceous sandstone-type uranium ore, and has significant advantages such as high treatment efficiency, simple operation and low overall cost. Brief Description of the Drawings

[0027] Figure 1 is a schematic diagram of the internal structure of the device provided by an embodiment of the present invention. (a) is a front view, and (b) is a top view.

[0028] Figure 2 is a schematic diagram of the arrangement mode of the jet nozzles of the device provided by an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the details of the jet nozzle provided by the embodiment of the present invention.

[0030] In the figure: 1 - tank body, 2 - chemical dosing pump, 3 - leaching agent dosing pump, 4 - leaching agent dosing pipeline, 5 - stirring motor, 6 - mechanical stirring paddle, 7 - jet nozzle, 8 - drain pipe, 9 - feed inlet, 10 - discharge outlet, 11 - maintenance opening. Specific implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] As Figures 1-3 shown, a treatment device for the advanced oxidation activation of argillaceous sandstone-type uranium ore according to the present invention includes a tank body 1, a chemical dosing pump 2, a stirring motor 5, a mechanical stirring paddle 6 and a jet nozzle 7. The outer wall of the top of the tank body 1 is provided with a feed inlet 9 and a maintenance opening 11. The stirring motor 5 is connected to the mechanical stirring paddle 6 in the tank body 1 through a stirring rod. Through mechanical stirring 6, the ore pulp and the oxidant are fully mixed to avoid precipitation and improve the oxidation reaction efficiency. The outer walls of the four sides of the tank body 1 are provided with a jet nozzle 7, a drain pipe 8 and a discharge outlet 10. The chemical dosing pump 2 is connected to the jet nozzle 7. The activation reagent enters the tank body 1 from the jet nozzle 7 through the chemical dosing pump 2. The jet provided by the jet nozzle 7 is used to break the surface film of the ore particles, and the jet nozzle 7 forms micro-nano bubbles to improve the distribution uniformity of the oxidant in the reaction tank. The chemical dosing pump 2 can supply the oxidant to the reaction cavity to quickly oxidize uranium. The discharge outlet 10 is located at the upper part of the tank body 1. The material after the activation reaction can be discharged through the discharge outlet 10. The drain pipe 8 is located at the lower part of the tank body 1.

[0033] The tank body 1 is cylindrical. It should be noted that the tank body 1 can be of other shapes, such as prismatic, etc.

[0034] The tank body 1 is made of 304 stainless steel to ensure the mechanical strength and acid-base corrosion resistance of the equipment. The inner wall of the tank body 1 is sprayed with a polytetrafluoroethylene coating to further enhance the corrosion resistance. It should be noted that the materials of the tank body 1 and the coating on the inner wall of the tank body can also be selected according to requirements.

[0035] The uranium ore leaching agent is added into the feed port 9 through the leaching agent dosing pump 3. One end of the leaching agent dosing pipe 4 is connected to the leaching agent dosing pump 3, and the other end is connected to the feed port 9. The leaching agent dosing pump 3 is installed on the top of the tank body 1, and can inject powder or liquid uranium leaching material into the reaction cavity of the tank body 1 to improve the activation leaching efficiency of the uranium ore. The leaching agent dosing pump 3 adopts a screw pump or a diaphragm pump to ensure the stability of the injection process. It should be noted that the type of the leaching agent dosing pump 3 can also be selected according to demand.

[0036] The mechanical stirring paddle 6 is made of titanium alloy or stainless steel 316L, which has corrosion resistance and strength. It should be noted that the material of the mechanical stirring paddle 6 can also be selected according to needs.

[0037] The dosing pump 2 is a screw pump to ensure a stable injection process. It should be noted that the type of the dosing pump 2 can also be selected according to demand.

[0038] The height of the tank body 1 is 2.6-3.2m, for example, 2.6m, 2.8m, 3m or 3.2m, etc. When it is a cylinder, the bottom diameter is 2.4-2.8m, for example, 2.4m, 2.6m or 2.8m, etc.

[0039] The diameters of the feed port 9, the discharge port 10 and the drain pipe 8 are all between 5 and 20 mm, for example, they can be 5 mm, 10 mm, 15 mm or 20 mm, etc.

[0040] The jet nozzle 7 is a venturi structure homogenizing jet nozzle 7, which generates high-speed flow by spraying slurry and oxidant, increases turbulent mixing of slurry, improves dispersion and reaction efficiency of oxidant, and generates micro-nano bubbles at the nozzle to enhance the contact between oxygen and uranium slurry. The jet nozzle 7 has 8-12 nozzles evenly distributed along the inner wall of the cylinder of the tank body 1. The jet nozzle 7 directly acts on the surface film of ore particles by providing a high-speed, high-pressure liquid jet, destroying the integrity of the surface film from a physical level. In addition, the generated micro-nano bubbles can penetrate into the microcracks on the surface of the ore and the inside of the film layer. The high-speed collapse of the bubbles (i.e., cavitation effect) produces additional mechanical destructive force on the film, while enhancing the penetration ability of the oxidant. The high-pressure impact and micro-nano bubble action of the jet nozzle 7, combined with the dynamic friction and mixing of mechanical stirring, can achieve comprehensive removal of the surface film and further improve the uranium leaching efficiency.

[0041] The type and material of the jet nozzle 7 can be set according to the specific requirements of the reaction of the added oxidant during the reaction process, and is not limited to the above-mentioned Venturi structure jet nozzle.

[0042] There is an angle of 10 - 90° between each jet nozzle 7 and the inner wall of the tank body 1, ensuring that the oxidant and bubbles flow spirally in the cavity. The jet nozzle 7 is made of polytetrafluoroethylene, which has corrosion resistance and strength. It should be noted that the material of the jet nozzle 7 can also be selected according to requirements.

[0043] The diameter of the jet nozzle 7 is 5 - 25 mm, for example, it can be 5 mm, 10 mm, 20 mm or 25 mm, etc.

[0044] In addition, the type and material of the jet nozzle 7 can be set according to the specific requirements of the reaction of the added oxidant during the reaction process, not limited to the above 5 - 25 mm. For example, it can be 5 mm, 30 mm, 50 mm, etc. This application does not limit it.

[0045] A treatment method for the advanced oxidation activation of argillaceous sandstone - type uranium ore includes the following steps: Step 1. Crush the argillaceous sandstone - type uranium ore and mix it with an appropriate amount of water to prepare a slurry with a certain concentration.

[0046] Step 2. Add the slurry into the tank body through the feed inlet, and pump in the leaching agent using the leaching agent dosing pump. Start the stirring motor and set a certain rotation speed to uniformly mix the slurry.

[0047] Step 3. Start the dosing pump to add the oxidant and adjust it to a certain flow rate. The oxidant and gas enter the tank body through the venturi jet nozzle, and micro - nano fine bubbles are formed during the spraying process to fully contact the slurry. Using the catalytic advanced oxidation technology, hydroxyl radicals and superoxide radicals are generated to improve the activation and dissolution efficiency of uranium minerals.

[0048] Step 4. After the reaction is completed, collect the activated concentrated ore liquid from the discharge port and collect the remaining mineral residues from the drain pipe.

[0049] Step 5. Analyze the uranium concentration in the ore liquid and ore slag by ICP - MS, and calculate the leaching activation rate of the uranium ore.

[0050] Furthermore, precisely control the addition amounts of the oxidant and uranium leaching material through the dosing pump, and adjust the dosing rate in real - time according to the slurry state.

[0051] Furthermore, the oxidant is any one of hydrogen peroxide, persulfate, percarbonate, peracetic acid, and generates reactive oxygen species (ROS) such as hydroxyl radicals (HO • ) and superoxide radicals (O2 •- ) through the catalytic advanced oxidation technology to accelerate the oxidative dissolution of argillaceous sandstone - type uranium ore.

[0052] Further, the leaching agent is any one of pyrite, magnetite, ferrihydrite, nano zero-valent iron, ferric sulfate, ferric nitrate, ferrous sulfate, ferrous nitrate, which is used to accelerate the rate of the oxidant generating reactive oxygen species.

[0053] Example 1. 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 muddy sandstone type uranium ore was crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 5%. The pulp was added into the tank through the equipment feed inlet, the stirring motor was started, and the rotation speed was set at 500 r / min to uniformly mix the pulp. Pyrite was added as a leaching agent material from the top chemical feeding port 2 of the equipment. The dosing pump 2 was started to add hydrogen peroxide, and the flow rate was adjusted to 0.1 m 3 / h. The oxidant was added into the equipment tank body 1 through the jet nozzle 7 to form fine bubbles in full contact with the pulp. The reaction continued for 0.5 hour to ensure the activation of uranium. After the reaction was completed, the activated concentrated ore liquid was collected from the discharge port 10, and the remaining mineral residues were collected from the drain pipe 8. The uranium concentrations in the ore liquid and ore slag were analyzed by ICP-MS, and the leaching activation rate of the uranium ore was calculated. Under this condition, the activation rate of the uranium ore was 87%.

[0054] 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 muddy sandstone type uranium ore was crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 7%. The pulp was added into the tank body 1 through the equipment feed inlet 9, the stirring motor 5 was started, and the rotation speed was set at 400 r / min to uniformly mix the pulp. Ferric sulfate was added as a leaching agent material from the top chemical feeding port of the equipment. The dosing pump 2 was started to add potassium monopersulfate, and the flow rate was adjusted to 0.08 m 3 / h. The oxidant was added into the equipment tank through the jet nozzle 7 to form fine bubbles in full contact with the pulp. The reaction continued for 0.75 hour to ensure the activation of uranium. After the reaction was completed, the activated concentrated ore liquid was collected from the discharge port 10, and the remaining mineral residues were collected from the drain pipe 8. The uranium concentrations in the ore liquid and ore slag were analyzed by ICP-MS, and the leaching activation rate of the uranium ore was calculated. Under this condition, the activation rate of the uranium ore was 85%.

[0055] 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 muddy sandstone type uranium ore was crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 3%. The pulp was added into the tank body 1 through the equipment feed inlet 9, the stirring motor 5 was started, and the rotation speed was set at 450 r / min to uniformly mix the pulp. Magnetite was added as a leaching agent material from the top chemical addition port of the equipment. The dosing pump 2 was started to add hydrogen peroxide, and the flow rate was adjusted to 0.12 m 3 / h. The oxidant was added into the equipment tank body 1 through the jet nozzle 7 to form fine bubbles and fully contact with the pulp. The reaction continued for 1 hour to ensure the activation of uranium. After the reaction was completed, the activated concentrated ore liquid was collected from the discharge port 10, and the remaining mineral residue was collected from the drain pipe 8. The uranium concentrations in the ore liquid and ore slag were analyzed by ICP-MS, and the leaching activation rate of the uranium ore was calculated. Under this condition, the activation rate of the uranium ore was 81%.

[0056] Example 4. 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 muddy sandstone type uranium ore was crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 8%. The pulp was added into the tank body through the equipment feed inlet 9, the stirring motor 5 was started, and the rotation speed was set at 600 r / min to uniformly mix the pulp. Ferric nitrate was added as a leaching agent material from the top chemical addition port of the equipment. The dosing pump 2 was started to add hydrogen peroxide, and the flow rate was adjusted to 0.15 m 3 / h. The oxidant was added into the equipment tank body 1 through the jet nozzle 7 to form fine bubbles and fully contact with the pulp. The reaction continued for 1.2 hours to ensure the activation of uranium. After the reaction was completed, the activated concentrated ore liquid was collected from the discharge port 10, and the remaining mineral residue was collected from the drain pipe 8. The uranium concentrations in the ore liquid and ore slag were analyzed by ICP-MS, and the leaching activation rate of the uranium ore was calculated. Under this condition, the activation rate of the uranium ore was 90%.

[0057] Comparative Example 1. The muddy sandstone type uranium ore was crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 5%. The pulp was added into the tank body 1 through the equipment feed inlet 9, the stirring motor 5 was started, and the rotation speed was set at 500 r / min to uniformly mix the pulp. Pyrite was added as a leaching agent material from the top chemical addition port of the equipment. 10 L of hydrogen peroxide with a concentration of 30% was added from the top chemical addition port. The reaction continued for 0.5 hour to ensure the activation of uranium. After the reaction was completed, the activated concentrated ore liquid was collected from the discharge port 10. Under this condition, the activation rate of the uranium ore was 68%.

[0058] Comparative Example 2. The argillaceous sandstone-type uranium ore is crushed to less than 200 mesh and mixed with an appropriate amount of water to prepare a pulp with a concentration of 5%. The pulp is added into the tank 1 through the equipment feed inlet. Pyrite is added as a leaching agent material from the top chemical addition port of the equipment. Start the chemical addition pump 2 to add hydrogen peroxide, and adjust the flow rate to 0.1m 3 / h. The oxidant is added into the equipment tank 1 through the jet nozzle 7 to form fine bubbles and fully contact with the pulp. React continuously for 0.5 hours to ensure the activation of uranium. After the reaction is completed, the activated selected ore liquid is collected from the discharge port 10. Under this condition, the activation rate of the uranium ore is 42%.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A treatment device for advanced oxidation activation of argillaceous sandstone-type uranium ore, characterized in that, It includes a tank body, a chemical dosing pump and a jet nozzle. The outer wall of the top of the tank body has a feeding port and a maintenance port. The outer walls around the tank body have jet nozzles, a drain pipe and a discharge port. The chemical dosing pump is connected to the jet nozzle. The oxidant enters the tank body through the jet nozzle from the chemical dosing pump. The jet provided by the jet nozzle is used to break the surface film of ore particles, and the jet nozzle is also used to form micro-nano bubbles of the oxidant.

2. The device according to claim 1, characterized in that, It further includes a stirring motor located at the top of the tank body. The stirring motor is connected to a mechanical stirring paddle inside the tank body through a stirring rod.

3. The device according to claim 1, characterized in that, The mechanical stirring paddle is made of titanium alloy or stainless steel.

4. The device according to claim 1, characterized in that There are 8 - 12 nozzles evenly distributed along the inner wall of the cylindrical body of the tank body for the jet nozzle. Each jet nozzle has an angle of 10 - 90° with the inner wall of the tank body main body.

5. The device according to claim 1, characterized in that, The jet nozzle is made of polytetrafluoroethylene, titanium alloy or 316L stainless steel.

6. The device according to claim 1, wherein The jet nozzle adopts a Venturi jet nozzle, a conical jet nozzle, a narrow-angle jet nozzle, a linear jet nozzle or a mixing head jet nozzle.

7. A treatment method for advanced oxidation activation of argillaceous sandstone-type uranium ore, characterized in that, It includes the following steps: Step 1. Crush the argillaceous sandstone-type uranium ore and mix it with an appropriate amount of water to prepare a pulp with a certain concentration. Step 2. Add the pulp into the tank body through the feeding port, and pump in the leaching agent by using a leaching agent dosing pump. Start the stirring motor and set a certain rotation speed to evenly mix the pulp. Step 3. Start the chemical dosing pump to add the oxidant, adjust it to a certain flow rate. The oxidant and gas enter the tank body through the Venturi jet nozzle. The oxidant forms micro-nano fine bubbles and fully contacts with the pulp. Step 4. After the reaction is completed, collect the activated concentrated ore liquid from the discharge port, and collect the remaining mineral residues from the drain pipe. Step 5. Analyze the uranium concentration in the ore liquid and ore slag by ICP-MS, and calculate the leaching activation rate of the uranium ore.

8. The method according to claim 7, wherein In Step 3, the addition amounts of the oxidant and the uranium leaching material are precisely controlled by the chemical dosing pump, and the feeding rate is adjusted in real time according to the pulp state.

9. The method according to claim 7, wherein In Step 3, the oxidant is any one of hydrogen peroxide, persulfate, percarbonate, peracetic acid.

10. The method according to claim 7, characterized in that, In Step 2, the leaching agent is any one of pyrite, magnetite, ferrihydrite, nano-zero valent iron, ferric sulfate, ferric nitrate, ferrous sulfate, ferrous nitrate.

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