Pneumatic energy mixed-phase flow uniform mixing device and efficient uniform mixing activation system

Abstract

The invention discloses a pneumatic energy mixed-phase flow uniform mixing device which is characterized in that a fixed bracket is mounted at the bottom of a uniform mixing reaction kettle barrel, a mixed-phase flow uniform mixing spray head and a pneumatic energy distributor are mounted on the fixed bracket, an air inlet of the pneumatic energy distributor is connected with a high-pressure air supply device, an air outlet of the pneumatic energy distributor is connected with the mixed-phase flow uniform mixing spray head, and high-pressure air jet provides pneumatic energy; the mixed slurry is contacted and mixed with the mixed slurry in a limited space in the mixed-phase flow uniform mixing spray head to form a relatively low-density mixed-phase flow material, and the mixed-phase flow material is quickly conveyed under the action of continuous pneumatic thrust and upward buoyancy force and is sprayed out and diffused from a pipeline outlet at a high speed to drive ore pulp particles to form high-speed turbulent flow and mixed flow; the ore pulp particles and the activating agent are quickly mixed to realize shaftless stirring and uniform mixing. Turbulent flow and mixed-phase flow force between ore pulp and an activating agent are improved, the mixed-phase flow uniform mixing quality and efficiency are improved, the pneumatic energy mixed-phase flow uniform mixing device and the micro-electrolysis activating device are combined, an efficient uniform mixing activating system can be formed, and the leaching efficiency of metal minerals is improved.

Description

Technical Field

[0001] The invention relates to the technical field of efficient uranium beneficiation and deep graded separation and disposal, and in particular to a pneumatic energy mixed phase flow homogenizing device and a highly efficient homogenizing activation system. Background Art

[0002] In the chemical leaching and beneficiation process of uranium metal ore, the ore pulp after crushing or grinding often needs to be activated by a strong redox environment such as a strong acid or a strong alkali, and the uranium metal element is leached out through a complex chemical reaction.

[0003] In order to make the mineral particles fully contact with the activating agent, physical stirring is required to achieve a rapid mixing and activation reaction. In addition, after the slurry and the activating agent are mixed, they need to be aged for a certain period of time to achieve the leaching of metal elements. Therefore, achieving rapid mixing of the slurry and the activating agent and reducing the aging time are the keys to achieving efficient chemical leaching and beneficiation processes. An efficient, corrosion-resistant mixing and activation system under extreme environments is urgently needed to ultimately optimize the efficient chemical leaching and beneficiation process for metals.

[0004] Due to the extreme acid-base and strong redox environment, the requirements for mixing equipment are very high. In addition to high speed and sufficient torque, the corrosion resistance and wear resistance of equipment materials are more stringent. At present, the industry has increased the service life of mixing equipment through surface coating, development of new materials and other technical means. However, due to the actual problems of complex mechanical transmission structure and limited corrosion resistance of sealing structure, mixing equipment still has high use cost, high failure rate, and insufficient mixing activation efficiency. Therefore, reducing the mechanical transmission structure of the mixing system and realizing shaftless mixing will be the key to solving difficult problems. At present, there is a method that proposes to use pipelines to circulate through the pumping stroke for mixing; there is a method that uses the principle of jet pumps to mix materials by adding chemicals. However, due to the extreme acid-base and strong redox environment, the corrosion and wear of the delivery pump are large, and the failure rate is high, which seriously affects the normal operation of the actual production equipment. At the same time, the simple liquid flushing and suction circulation lacks the turbulence and mixing effect inside the mixed slurry, and the mixing efficiency and quality are unstable, which reduces the mixing effect. Summary of the invention

[0005] The main purpose of the present invention is to provide a pneumatic energy mixed-phase flow homogenizing device, which improves the turbulence and mixed flow power between the ore pulp and the activation agent, strengthens the turbulence and eddy disturbance of the mixed slurry, and effectively improves the quality and efficiency of the mixed-phase flow homogenizing; at the same time, it increases the efficiency of the activation reaction micro-electrolysis, improves the efficiency of homogenizing activation and chemical leaching, and forms an integrated system with efficient homogenizing activation function of the ore pulp under extreme environments, quickly improves the leaching efficiency of metal minerals, and finally dissolves the metal minerals into the solution in the form of ions.

[0006] The technical solution adopted by the present invention is: A pneumatic kinetic energy mixed-phase flow homogenizing device, comprising a homogenizing reaction kettle cylinder, a mixed-phase flow homogenizing injection device and a high-pressure air supply device; the mixed-phase flow homogenizing injection device comprises a fixed bracket, a mixed-phase flow homogenizing nozzle and a pneumatic kinetic energy distributor, the fixed bracket is fixedly installed at the bottom of the homogenizing reaction kettle cylinder, the mixed-phase flow homogenizing nozzle and the pneumatic kinetic energy distributor are respectively installed on the fixed bracket, the air inlet of the pneumatic kinetic energy distributor is connected to the high-pressure air supply device, the air outlet of the pneumatic kinetic energy distributor is connected to the mixed-phase flow homogenizing nozzle, and the high-pressure air supply device is connected to the mixed-phase flow homogenizing nozzle. The high-pressure gas generated by the gas device enters the mixed-phase flow homogenizing nozzle through the pneumatic energy distributor. In the mixed-phase flow homogenizing nozzle, the pneumatic energy is provided by the high-pressure gas jet, and it contacts and mixes with the mixed slurry in the limited space in the pipeline to form a relatively low-density mixed-phase flow material. It is quickly transmitted under the action of continuous pneumatic thrust and buoyancy, and is ejected and diffused at high speed from the pipeline outlet, driving the slurry particles to form high-speed turbulence and mixed flow, so that the slurry particles and the activator are quickly mixed, completing the mutual conversion of pneumatic kinetic energy and mechanical kinetic energy of the mixed phase to achieve shaftless stirring and homogenizing.

[0007] In the above scheme, the mixed-phase flow homogenizing nozzle includes a mixed-phase flow nozzle, an axial sleeve and a slurry inlet pipe which are coaxially arranged and interconnected; the upper end of the axial sleeve is fixedly connected to the mixed-phase flow nozzle, and a gap is left between the inner wall of the lower end of the mixed-phase flow nozzle and the outer wall of the upper end of the axial sleeve to form a high-pressure air chamber, and the high-pressure air chamber is provided with an air inlet joint for connecting the air outlet of the pneumatic energy distributor; the area where the mixed-phase flow nozzle is located on the upper part of the axial sleeve is, from bottom to top, a mixed flow negative pressure zone, a multiphase flow mixed flow lifting zone and a diffusion flow outlet, wherein the mixed flow negative pressure zone is connected to the high-pressure air chamber by a gap channel; the lower end of the axial sleeve is fixedly connected to the slurry inlet pipe, and a slurry inlet channel is formed inside the slurry inlet pipe and the axial sleeve.

[0008] In the above scheme, the slurry inlet pipe is a trumpet structure that is thick at the bottom and thin at the top, and the diameter D of the upper end of the slurry inlet pipe is equal to the inner diameter of the shaft sleeve.

[0009] In the above scheme, the diameter D of the upper end of the slurry inlet pipe must satisfy formula (1): D≤ (1) In the formula, Q m is the slurry design flow rate, is the advance design value; V is the boost flow rate.

[0010] In the above scheme, the flow rate V is calculated according to formula (2): V>4ω max (2) In the formula, ω max is the maximum value of the slurry particle settling velocity ω, and the slurry particle settling velocity ω is calculated according to formula (5): (5) In the formula, , Re is the Reynolds coefficient, , ρ s is the density of mud and sand particles, ρ is the fluid density, d is the spherical diameter of mud and sand particles, is the kinematic viscosity coefficient of the liquid.

[0011] In the above scheme, the inner diameter of the mixed flow negative pressure zone of the mixed-phase flow nozzle gradually decreases from bottom to top, the inner diameter of the multiphase flow mixed flow lifting zone remains unchanged from bottom to top, and the inner diameter of the diffusion flow outlet gradually increases from bottom to top.

[0012] In the above scheme, the upper end and the lower end of the shaft sleeve are fixedly connected to the mixed-phase flow nozzle and the slurry inlet pipe respectively by means of threaded connection.

[0013] In the above scheme, a discharge port is provided at the bottom end of the cylinder of the homogenizing reactor, and the discharge port is connected to a slurry discharge pipe, and an electromagnetic control valve is provided on the slurry discharge pipe.

[0014] In the above scheme, the mixed-phase flow mixing nozzle is installed on the fixed bracket through a directional locking hinge, and the directional locking hinge can adjust the angle of the mixed-phase flow mixing nozzle and can be locked; the mixed-phase flow mixing nozzle is evenly arranged in multiple numbers along the circumference of the fixed bracket.

[0015] In the above solution, the pneumatic energy distributor is fixed by a pipe clamp device provided on the fixing bracket.

[0016] Correspondingly, the present invention also proposes a high-efficiency mixing and activation system, comprising the above-mentioned gas kinetic energy mixed-phase flow mixing device, and also comprising a micro-electrolysis activation device, wherein the micro-electrolysis activation device comprises a plate-type micro-electrolysis electrode, a micro-electrolysis activation reaction cell and a constant-current power supply; the plate-type micro-electrolysis electrode is fixed at both ends of the inner side of the micro-electrolysis activation reaction cell by insulating material, and the constant-current power supply is arranged on the outer side of the micro-electrolysis activation reaction cell and connected to the plate-type micro-electrolysis electrode by a wire.

[0017] In the above scheme, the bottom end of the plate-type micro-electrolysis electrode is spaced a certain distance from the bottom of the micro-electrolysis activation reaction tank to ensure the normal flow and discharge of the slurry material.

[0018] The beneficial effects produced by the present invention are: 1. The pneumatic energy mixed phase flow homogenizing device provided by the present invention uses a compressed high-pressure air jet to provide pneumatic energy, which is mixed with the mixed slurry in the limited space in the pipeline to form a relatively low-density mixed phase flow material, which is quickly transmitted under the action of continuous pneumatic thrust and buoyancy, and is ejected and diffused at high speed from the pipeline outlet, driving the ore pulp particles to form high-speed turbulence and mixed flow, so that the ore pulp particles and the activator are quickly mixed, and the pneumatic kinetic energy and the mechanical kinetic energy of the mixed phase are converted to each other to achieve shaftless stirring and homogenizing. The high-pressure air flow is mixed with the ore pulp to form a mixed phase flow material, and the air and the slurry mixture exchange kinetic energy. The air is mixed in the mixed phase flow with tiny compressed bubbles. With the pneumatic support energy, the multiphase mixed flow slurry is ejected at high speed from the pipeline outlet of the pneumatic energy mixed phase flow device, and the turbulence and eddy current disturbance with a large stroke in the stirring barrel fully mix the material. At the same time, the tiny compressed bubbles grow rapidly and break to release energy to break up the adhered and agglomerated particle clusters, increase the contact area of ​​the particles, and thus achieve efficient homogenizing of the mineral particles and the activating agent.

[0019] 2. The shaftless mixing method makes the overall structure simple, without mechanical transmission and high-speed rotating structure. The mixing structure has strong corrosion resistance, which greatly reduces the failure rate when working in extreme acid and alkali and strong redox environment, improves the overall service life, and reduces the operation and maintenance cost of system equipment.

[0020] 3. After the ore pulp and the activating agent are mixed evenly, they need to be aged for a certain period of time to fully react the activating agent with the mineral particles and precipitate the metal minerals in a free ionic state. The present invention adds a micro-electrolysis activation device to accelerate the activation reaction through a micro-current electric field, precipitate the metal minerals in a free ionic state, and quickly improve the leaching efficiency of the metal minerals. Thus, an integrated system with efficient slurry mixing and activation functions under extreme environments is formed, and finally high-value metal high-precision extreme beneficiation is achieved.

[0021] 4. The high-efficiency homogeneous mixing activation system of the present invention can be applied to the high-efficiency uranium beneficiation and deep classification separation and disposal process, and can fully dissolve and leach the uranium metal elements in the powdery ore particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic structural diagram of the pneumatic kinetic energy mixed-phase flow homogenizing device of the present invention; Figure 2 yes Figure 1A schematic structural diagram of a mixed-phase flow homogenizing injection device of a pneumatic kinetic energy mixed-phase flow homogenizing device; Figure 3 yes Figure 1 A top view of a mixed-phase flow homogenizing injection device of the pneumatic kinetic energy mixed-phase flow homogenizing device; Figure 4 yes Figure 3 A schematic diagram of the structure of a mixed-phase flow homogenizing nozzle of a mixed-phase flow homogenizing injection device shown; Figure 5 yes Figure 4 The structural exploded view of the mixed phase flow homogenizing nozzle shown; Figure 6 yes Figure 4 A structural cross-sectional view of a mixed-phase flow homogenizing nozzle shown; Figure 7 It is a structural schematic diagram of the efficient homogeneous mixing activation system of the present invention; Figure 8 yes Figure 7 The front view of the high-efficiency homogeneous mixing activation system is shown.

[0024] In the figure: 7. High-efficiency homogeneous mixing and activation system; 71. Pneumatic energy mixed-phase flow uniform mixing device; 711. Mixing reactor cylinder; 712. Mixed-phase flow uniform mixing injection device; 7121. Fixed bracket; 7122. Mixed-phase flow uniform mixing nozzle; 71221. Mixed-phase flow nozzle; 71222. Axis sleeve; 71223. Slurry inlet pipe; 71224. Air inlet joint; 71225. High-pressure air chamber; 71226. Mixed flow negative pressure zone; 71227. Multiphase flow mixed flow lifting zone; 71228. Diffusion flow outlet; 71229. Slurry inlet channel; 7123. Directional locking hinge; 7124. Pneumatic energy distributor; 7125. Pipe clamp device; 7126. High-pressure airway hose; 7127. Air inlet; 713. Slurry discharge pipeline; 714. Solenoid control valve; 715. Air inlet pipeline; 716. High-pressure air supply device; 72. Micro-electrolysis activation device; 721. Plate-type micro-electrolysis electrode; 722. Micro-electrolysis activation reaction cell; 723. Regulated current power supply; 724. Conductor; 725. Activated ore pulp outlet; 73. Automatic control system. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and 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.

[0026] It should be noted that the illustrations provided in the embodiments of the present invention are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout type may also be more complicated.

[0027] In the present invention, it is also necessary to explain that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first" and "second" appear, they are only used for description and distinction purposes, and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 As shown, a pneumatic kinetic energy mixed phase flow homogenizing device 71 provided by an embodiment of the present invention comprises a homogenizing reaction kettle cylinder 711, a mixed phase flow homogenizing injection device 712 and a high pressure gas supply device 716. Figure 2-3 As shown, the mixed-phase flow mixing injection device 712 includes a fixed bracket 7121, a mixed-phase flow mixing nozzle 7122 and a pneumatic energy distributor 7124. The fixed bracket 7121 is fixedly installed at the bottom of the mixing reactor cylinder 711, the mixed-phase flow mixing nozzle 7122 and the pneumatic energy distributor 7124 are respectively installed on the fixed bracket 7121, and the air inlet 7127 of the pneumatic energy distributor 7124 is connected to the high-pressure air supply device 716 through the air inlet pipeline 715, and the air outlet of the pneumatic energy distributor 7124 is connected to the mixed-phase flow mixing nozzle 7122 through the high-pressure air duct hose 7126. The high-pressure air generated by the high-pressure air supply device 716 enters the pneumatic energy distributor 7124 through the air inlet pipeline 715, and then enters the mixed-phase flow homogenizing nozzle 7122. In the mixed-phase flow homogenizing nozzle 7122, the pneumatic energy is provided by the compressed high-pressure air jet, and the mixed slurry is contacted and mixed in the limited space in the pipeline to form a relatively low-density mixed-phase flow material, which is quickly transmitted under the action of continuous pneumatic thrust and buoyancy, and is ejected and diffused at high speed from the pipeline outlet, driving the slurry particles to form high-speed turbulence and mixed flow, so that the slurry particles and the activator are quickly mixed, and the pneumatic kinetic energy and the mechanical kinetic energy of the mixed phase are converted to each other to achieve shaftless stirring and homogenizing. The discharge port at the bottom of the homogenizing reactor cylinder 711 is connected to the slurry discharge pipeline 713, and the slurry discharge pipeline 713 is provided with an electromagnetic control valve 714.

[0029] The mixed-phase flow homogenizing nozzle 7122 is installed on the fixed bracket 7121 through a directional locking hinge 7123, and the directional locking hinge 7123 can adjust the angle of the mixed-phase flow homogenizing nozzle 7122 and has a locking function. In this embodiment, three mixed-phase flow homogenizing nozzles 7122 are evenly arranged along the circumference of the fixed bracket 7121. The pneumatic energy distributor 7124 is fixed by a pipe clamp device 7125 provided on the fixed bracket 7121; three air supply ports are provided on the pneumatic energy distributor 7124, which are respectively connected to the three mixed-phase flow homogenizing nozzles 7122 through high-pressure airway hoses 7126. The fixed bracket 7121 is fixed to the bottom of the homogenizing reactor cylinder 711 by anti-corrosion bolts or welding.

[0030] The mixed phase flow homogenizing nozzle 7122 is the core component of the pneumatic energy mixed phase flow homogenizing device 71. Figure 4-6 As shown, the mixed-phase flow homogenizing nozzle 7122 includes a mixed-phase flow nozzle 71221, an axial sleeve 71222 and a slurry inlet pipe 71223 which are coaxially arranged and interconnected. The upper end of the axial sleeve 71222 is fixedly connected to the mixed-phase flow nozzle 71221 through an external thread, and a gap is left between the lower end inner wall of the mixed-phase flow nozzle 71221 and the upper end outer wall of the axial sleeve 71222 to form a high-pressure air chamber 71225. The high-pressure air chamber 71225 is provided with an air inlet joint 71224 for connecting the air outlet of the pneumatic energy distributor 7124. The area of ​​the mixed-phase flow nozzle 71221 located on the upper part of the axial sleeve 71222 is, from bottom to top, a mixed flow negative pressure area 71226, a multiphase flow mixed flow lifting area 71227 and a diffuser outlet 71228, wherein the mixed flow negative pressure area 71226 is connected to the high-pressure air chamber 71225 by a gap channel. The lower end of the shaft sleeve 71222 is fixedly connected to the slurry inlet pipe 71223 via an internal thread, and a slurry inlet channel 71229 is formed inside the slurry inlet pipe 71223 and the shaft sleeve 71222 .

[0031] Further optimization is carried out, the inner diameter of the mixed flow negative pressure zone 71226 of the mixed-phase flow nozzle 71221 gradually decreases from bottom to top, which has a better compression effect on the high flow rate medium, so that the pressure in the transition zone from the mixed flow negative pressure zone 71226 to the multiphase flow mixed flow lifting zone 71227 is increased, which is conducive to the mixing of high-pressure air and slurry to form a high-speed gas-liquid-solid multiphase mixed flow material; the inner diameter of the multiphase flow mixed flow lifting zone 71227 remains unchanged from bottom to top, increasing the uniform mixing time and path of the multiphase mixed flow material, and the inner diameter of the diffusion flow outlet 71228 gradually expands from bottom to top, which is conducive to the high-speed injection and diffusion of the multiphase mixed flow material.

[0032] Further optimization, the slurry inlet pipe 71223 is a trumpet structure that is thick at the bottom and thin at the top, which is conducive to the collection and feeding of mud. The diameter D of the upper end of the slurry inlet pipe 71223 is equal to the inner diameter of the shaft sleeve 71222.

[0033] The working principle of the mixed phase flow homogenizing nozzle 7122 is: High-pressure air enters the high-pressure air chamber 71225 from the air inlet joint 71224. The high-pressure air chamber 71225 and the mixed flow negative pressure zone 71226 are connected by a gap channel A with a smaller cross-section. The high-pressure air enters the mixed flow negative pressure zone 71226 through the gap channel A at a high speed jet flow, mixes with the slurry in the chamber to form a gas-liquid-solid multiphase mixed flow; the compressed air initially mixes with the slurry in the form of larger bubbles, and continues to enter the multiphase flow mixed flow lifting zone 71227. At this time, the inner diameter of the tube decreases, the local pressure increases, the air and the slurry mixture exchange kinetic energy, the diameter of the compressed air bubbles decreases and mixes in the mixed phase flow with tiny compressed bubbles, the multiphase mixed flow density decreases, and the newly formed multiphase mixed flow generates an upward lifting and squeezing force, and a higher flow rate is formed under the composite action of the pneumatic lifting kinetic energy as the main force, and then continues to enter the diffusion flow outlet 71228 and is sprayed at a high speed to diffuse into the external slurry.

[0034] At the same time, when the high-pressure air enters the mixed flow negative pressure zone 71226 through the gap channel A at a high speed, a certain negative pressure is formed in the transition zone B at the intersection with the upper end of the slurry inlet channel 71229. Under the action of the internal and external pressure difference, the slurry in the slurry inlet channel 71229 is continuously lifted to participate in the mixed flow and uniform mixing, and then a large amount of mixed slurry is sucked into the circulation through the slurry inlet pipe 71223. When the inlet slurry flow rate is large enough, a large amount of solid particles will be entrained for mixed flow circulation. With the pneumatic support energy, the multiphase mixed flow slurry is ejected at high speed from the outlet of the mixed phase flow uniform mixing nozzle 7122, forming a large turbulent and eddy disturbance in the uniform mixing reactor cylinder 711, and the materials are fully mixed.

[0035] In order to ensure the suction, lifting and mixing flow capacity and efficiency of the mixed phase flow homogenizing nozzle 7122, it is necessary to ensure a sufficient slurry inlet flow rate. When the kinetic energy of the compressed air is fixed, the diameter of the slurry inlet channel 71229 and the slurry inlet pipe 71223 is the core of the entire structure, which affects the overall equipment structure size on the one hand, and the overall mixed flow flow rate and production capacity of the equipment on the other hand. Therefore, when the total mixed flow volume is determined, the diameter D of the slurry inlet pipe 71223 will directly affect the production capacity and the size of the entire equipment components.

[0036] The diameter D parameter design of the slurry inlet pipe 71223 of the present invention is calculated using formula (1), which is: D≤ (1) In the formula, Q m is the design flow rate of the slurry, which is a pre-designed value and is generally a value measured through actual working condition tests; V is the lift flow rate.

[0037] According to the data model design, in order to ensure that the particles in the mud can be efficiently lifted through the suction port, the negative pressure suction power must be greater than the particle sedimentation, that is, the lifting flow rate V in the pipeline must be greater than the slurry particle sedimentation velocity ω; in order to ensure that the mineral particles within a certain particle range are smoothly lifted and mixed, the lifting flow rate V must be greater than the maximum value of the slurry particle sedimentation velocity ω max , calculated according to formula (2): V>4ω max (2) Based on experience and related basic research theories, it is assumed that the slurry particles are spherical. During the particle descent process, when the resistance of the particles is balanced with gravity, they are in a constant descent. The value of the slurry particle settling velocity ω can be calculated according to formula (3): (3) Where Cd is the sedimentation resistance coefficient of mud and sand particles, ρ s is the density of mud and sand particles, ρ is the fluid density; d is the spherical diameter of mud and sand particles, is the acceleration due to gravity.

[0038] However, in actual working conditions, the shape of slurry particles is not a standard sphere, so it is necessary to introduce further parameters for revision. Combining a large amount of experimental data and empirical parameters, the sedimentation resistance coefficient Cd of mud and sand particles is expressed as formula (4): (4) Where Re is the Reynolds coefficient.

[0039] Therefore, formula (4) is substituted into formula (3), and formula (5) is obtained through empirical parameter optimization: (5) In the formula, , , is the kinematic viscosity coefficient of the liquid. Based on the data experience summary, the parameter design values ​​in this embodiment are C1=13.95, C2=1.09; μ can be determined based on experience.

[0040] According to the prototype experiment verification, by comparing with the stirring effect of the stirring blade, the overall effective cycle mixing time of the pneumatic kinetic energy mixed-phase flow mixing device 71 of the present invention is reduced by 50%, thereby effectively improving the mixed-phase flow mixing quality and efficiency.

[0041] like Figure 7-8As shown, an efficient homogenous mixing activation system 7 provided by an embodiment of the present invention includes the above-mentioned pneumatic energy mixed phase flow homogenous mixing device 71, and also includes a micro-electrolysis activation device 72 and an automatic control system 73. The micro-electrolysis activation device 72 includes a plate-type micro-electrolysis electrode 721, a micro-electrolysis activation reaction pool 722 and 724. The plate-type micro-electrolysis electrode 721 is fixed to the inner ends of the micro-electrolysis activation reaction pool 722 by insulating materials, and the constant current power supply 723 is arranged on the outer side of the micro-electrolysis activation reaction pool 722, and is connected to the plate-type micro-electrolysis electrode 721 through a wire to form a stable electric field. According to the working condition experimental verification summary, it is more appropriate to set the micro-electric field voltage to 36V. An activated ore pulp outlet 725 is provided at the bottom of the micro-electrolysis activation reaction pool 722, and the bottom end of the plate-type micro-electrolysis electrode 721 is spaced a certain distance from the bottom of the micro-electrolysis activation reaction pool 722 to ensure the normal flow and discharge of the ore pulp material.

[0042] The working principle of the efficient homogeneous mixing activation system 7 of the present invention is: The crushed and ground homogenized ore slurry and activating agent are added into the feed port at the upper end of the mixing reactor cylinder 711 of the pneumatic kinetic energy mixed-phase flow mixing device 71 respectively by pipeline transportation, until the liquid level of the mixed slurry reaches one-third of the total volume. After the slurry fully submerges the mixed-phase flow mixing injection device 712, the automatic control system 73 starts the high-pressure gas supply device 716 to supply gas.

[0043] The mixed-phase flow homogenizing injection device 712 uses a compressed high-pressure air jet to provide pneumatic energy, which contacts and mixes with the mixed slurry in the limited space in the pipeline to form a relatively low-density mixed-phase flow material, which is quickly transmitted under the action of continuous pneumatic thrust and buoyancy, and is ejected and diffused at high speed from the pipeline outlet, driving the slurry particles to form high-speed turbulence and mixed flow, so that the slurry particles and the activator are quickly mixed, and shaftless stirring and homogenizing are achieved. At the same time, a certain negative pressure is formed at the intersection of the high-pressure air injection port and the lower end feed pipe. Under the action of the internal and external pressure difference, the slurry in the pipe is continuously lifted to participate in the mixed flow and homogenizing. When the high-pressure air flow mixes with the slurry to form a mixed-phase flow material, the air and the slurry mixture exchange kinetic energy, and the air is mixed in the mixed-phase flow as tiny compressed bubbles. With the pneumatic support energy, the multiphase flow mixed flow slurry is ejected at high speed from the pneumatic kinetic energy mixed-phase flow device pipeline outlet, forming a large turbulence and eddy disturbance in the homogenizing reactor cylinder 711, and the material is fully homogenized. At the same time, tiny compressed bubbles grow and break up quickly, releasing energy to break up the agglomerated particles, increasing the contact area of ​​the particles, thereby achieving efficient and uniform mixing of mineral particles and activating agents. When the flow rate in the pipe is large enough, the slurry at the inlet will carry particles and heavier mud and sand into the mixed flow circulation, avoiding solid particles from settling and clogging due to excessively fast sedimentation.

[0044] After the ore pulp and the activation agent are evenly mixed, they need to be aged for a certain period of time to fully react the activator with the mineral particles and resolve the metal minerals in a free ionic state. The present invention adds a micro-electrolysis activation device 72, which accelerates the activation reaction through a micro-current electric field and quickly improves the leaching efficiency of metal minerals. After the ore pulp mixed material is evenly mixed in the gas kinetic energy mixed phase flow evenly mixing device 71, the electromagnetic control valve 714 is started, the valve is opened, and the ore pulp mixed material enters the micro-electrolysis activation device 72 through the slurry discharge pipe 713. When the evenly mixed ore pulp material fills the micro-electrolysis activation reaction tank 722, the activation reaction is accelerated under the micro-current electric field, the leaching efficiency of metal minerals is quickly improved, and the metal minerals are resolved in a free ionic state. Finally, the activated mixed material is discharged through the activated ore pulp discharge port to enter the next process (solid-liquid separation process), and finally high-value metal high-precision extreme beneficiation is achieved.

[0045] The high-efficiency homogeneous mixing activation system 7 of the present invention improves the turbulence and mixed flow power between the ore pulp and the activation agent, strengthens the turbulence and eddy disturbance of the mixed slurry, increases the micro-electrolysis efficiency of the activation reaction, and improves the efficiency of homogeneous mixing activation and chemical leaching. It is an integrated system with the function of high-efficiency homogeneous mixing activation of ore pulp under extreme environments. The high-efficiency homogeneous mixing activation system 7 of the present invention can be applied to the high-efficiency ore dressing and deep classification separation and disposal process of uranium, and can fully dissolve and leach the uranium metal elements in the fine ore particles.

[0046] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0047] The order of execution of each step in the above embodiment does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0048] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A pneumatic kinetic energy mixed phase flow homogenizing device, characterized in that: It comprises a homogenous mixing reactor cylinder, a mixed-phase flow homogenous mixing injection device and a high-pressure air supply device; the mixed-phase flow homogenous mixing injection device comprises a fixed bracket, a mixed-phase flow homogenous mixing nozzle and a pneumatic energy distributor, the fixed bracket is fixedly installed at the bottom of the homogenous mixing reactor cylinder, the mixed-phase flow homogenous mixing nozzle and the pneumatic energy distributor are respectively installed on the fixed bracket, the air inlet of the pneumatic energy distributor is connected to the high-pressure air supply device, the air outlet of the pneumatic energy distributor is connected to the mixed-phase flow homogenous mixing nozzle, and the high-pressure air supply device generates High-pressure gas enters the mixed-phase flow homogenizing nozzle through the pneumatic energy distributor. In the mixed-phase flow homogenizing nozzle, the high-pressure gas jet provides pneumatic energy, and contacts and mixes with the mixed slurry in the limited space in the pipeline to form a relatively low-density mixed-phase flow material. It is quickly transmitted under the action of continuous pneumatic thrust and buoyancy, and is ejected and diffused at high speed from the pipeline outlet, driving the slurry particles to form high-speed turbulence and mixed flow, so that the slurry particles and the activator are quickly mixed, completing the mutual conversion of pneumatic kinetic energy and mechanical kinetic energy of the mixed phase to achieve shaftless stirring and homogenizing.

2. The pneumatic kinetic energy mixed phase flow homogenizing device according to claim 1, characterized in that: The mixed-phase flow homogenizing nozzle comprises a mixed-phase flow nozzle, an axial sleeve and a slurry inlet pipe which are coaxially arranged and interconnected; the upper end of the axial sleeve is fixedly connected to the mixed-phase flow nozzle, and a gap is left between the inner wall of the lower end of the mixed-phase flow nozzle and the outer wall of the upper end of the axial sleeve to form a high-pressure air chamber, and the high-pressure air chamber is provided with an air inlet joint for connecting the air outlet of the pneumatic energy distributor; the area where the mixed-phase flow nozzle is located on the upper part of the axial sleeve is, from bottom to top, a mixed flow negative pressure zone, a multiphase flow mixed flow lifting zone and a diffusion flow outlet, wherein the mixed flow negative pressure zone is connected to the high-pressure air chamber by a gap channel; the lower end of the axial sleeve is fixedly connected to the slurry inlet pipe, and a slurry inlet channel is formed inside the slurry inlet pipe and the axial sleeve.

3. The pneumatic kinetic energy mixed phase flow homogenizing device according to claim 2, characterized in that: The slurry inlet pipe is a trumpet structure that is thick at the bottom and thin at the top, and the diameter D of the upper end of the slurry inlet pipe is equal to the inner diameter of the shaft sleeve.

4. The pneumatic energy mixed phase flow homogenizing device according to claim 3, characterized in that: The diameter D of the upper end of the slurry inlet pipe must satisfy formula (1): D≤ （1） In the formula, Q m is the slurry design flow rate, is the advance design value; V is the boost flow rate.

5. The pneumatic energy mixed phase flow homogenizing device according to claim 4, characterized in that: The flow rate V is calculated according to formula (2): V>4ω max (2) In the formula, ω max is the maximum value of the slurry particle settling velocity ω, and the slurry particle settling velocity ω is calculated according to formula (5): （5） In the formula, , Re is the Reynolds coefficient, , ρ s is the density of mud and sand particles, ρ is the fluid density, d is the spherical diameter of mud and sand particles, is the kinematic viscosity coefficient of the liquid.

6. The pneumatic energy mixed phase flow homogenizing device according to claim 2, characterized in that: The inner diameter of the mixed flow negative pressure zone of the mixed-phase flow nozzle gradually decreases from bottom to top, the inner diameter of the multiphase flow mixed flow lifting zone remains unchanged from bottom to top, and the inner diameter of the diffusion flow outlet gradually increases from bottom to top.

7. The pneumatic energy mixed phase flow homogenizing device according to claim 2, characterized in that: The upper end and the lower end of the shaft sleeve are fixedly connected to the mixed-phase flow nozzle and the slurry inlet pipe respectively by means of threaded connection.

8. The pneumatic energy mixed phase flow homogenizing device according to claim 1, characterized in that: A discharge port is provided at the bottom end of the cylinder of the homogenizing reactor, and the discharge port is connected to a slurry discharge pipeline, and an electromagnetic control valve is provided on the slurry discharge pipeline.

9. The pneumatic energy mixed phase flow homogenizing device according to claim 1, characterized in that: The mixed-phase flow homogenizing nozzle is installed on the fixed bracket through a directional locking hinge, and the directional locking hinge can adjust the angle of the mixed-phase flow homogenizing nozzle and can be locked; a plurality of the mixed-phase flow homogenizing nozzles are evenly arranged along the circumference of the fixed bracket.

10. The pneumatic kinetic energy mixed phase flow homogenizing device according to claim 1, characterized in that: The pneumatic energy distributor is fixed by a pipe clamp device arranged on the fixing bracket.

11. An efficient homogeneous mixing activation system, characterized in that: It comprises the pneumatic energy mixed-phase flow homogenizing device as described in any one of claims 1 to 10, and also comprises a micro-electrolysis activation device, wherein the micro-electrolysis activation device comprises a plate-type micro-electrolysis electrode, a micro-electrolysis activation reaction cell and a constant-current power supply; the plate-type micro-electrolysis electrode is fixed to the two ends of the inner side of the micro-electrolysis activation reaction cell by insulating material, and the constant-current power supply is arranged on the outer side of the micro-electrolysis activation reaction cell and connected to the plate-type micro-electrolysis electrode by a wire.

12. The high-efficiency homogeneous mixing activation system according to claim 11, characterized in that: The bottom end of the plate-type micro-electrolysis electrode is spaced a certain distance from the bottom of the micro-electrolysis activation reaction tank to ensure the normal flow and discharge of the slurry material.

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