Gas-liquid-solid three-phase dispersion system

Abstract

The invention provides a gas-liquid-solid three-phase dispersion system, and relates to the technical field of mineral flotation, the gas-liquid-solid three-phase dispersion system comprises an inclusion and a high-turbulence dissipation body, the inclusion surrounds the outer side of the high-turbulence dissipation body, and a flotation machine impeller is arranged on the inner side of the high-turbulence dissipation body; the wrapping body comprises an annular cylinder wall, and a plurality of runner holes are formed in the cylinder wall along an annular array; the high-turbulence dissipation body comprises a plurality of blade sets arranged along an annular array, each blade set comprises at least two layers of blades arranged inside and outside in the radial direction, and each layer of blades is provided with runner holes; the high-turbulence dissipation body, the flow channel holes in the high-turbulence dissipation body and the flow channel holes in the wrapping body form a fluid channel. The problems that in the prior art, the local gas content of a stator is insufficient, the stability of a foam layer is damaged due to the large turbulence intensity of the upper middle portion of a groove body, the relative speed difference of collision mineralization of bubbles and mineral particles is insufficient, and the collision mineralization size of micro-fine mineral particles and the bubbles is not matched can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of mineral flotation, in particular to a gas-liquid-solid three-phase dispersion system. Background Art

[0002] Flotation is a separation technology that utilizes the differences in physical and chemical properties of mineral surfaces (especially surface wettability) to selectively enrich one or several target minerals at the solid-liquid-gas three-phase interface, thereby achieving separation from gangue minerals. As the most important equipment in the flotation process, the flotation machine provides an excellent sorting environment for the separation and enrichment of minerals, and determines the recovery efficiency of minerals under certain process flows. During the operation of the flotation machine, as the impeller rotates, the fluid in the center area of ​​the impeller is gradually thrown out in a spiral upward, and a certain negative pressure is formed in the impeller area. The fluid around the impeller and the low-pressure air fed by the hollow shaft are continuously sucked and blown in, and are initially mixed to a certain extent in the impeller area. The fluid continuously thrown out by the impeller is further sheared and dispersed under the dispersing action of the stator. In this process, the gas is gradually sheared into small bubbles (usually 1~2mm), which increases the local gas content in the impeller-stator collision mineralization area and promotes the collision mineralization of mineral particles and bubbles; at the same time, under the guidance of the stator, the three The phase mixture flows along a fixed channel to achieve the transformation from circumferential flow to radial flow. After the radial flow flows outward to the side wall of the trough, a part of it flows downward to the bottom of the trough and re-enters the impeller area under the suction of the impeller, forming a bottom circulation in the flotation machine; a part of it flows upward to the middle and upper part of the trough, and after moving to the highest point, the flow direction changes from upward to downward and re-enters the impeller area, forming a large circulation in the upper area of ​​the flotation machine. In this process, the mineralized bubbles break away from the upper circulation flow field structure under the action of buoyancy, move upward as a whole, and form a foam layer, ultimately realizing the recovery of useful minerals.

[0003] It can be seen that the main functions of the stator include three aspects: 1) Direct the circumferential flow generated by the rotation of the impeller into radial flow; 2) To achieve further shear mixing of the gas-liquid-solid three-phase mixture, shear the gas to form small bubbles, and achieve collision mineralization of useful minerals and bubbles; 3) Cooperate with the tank structure to form the upper and lower circulation flow field structure in the flotation machine.

[0004] Related patents in the prior art: Chinese patent application CN101722113A published on June 9, 2010, discloses a stator of a direct-suspended flotation machine; Chinese patent application CN114602662A, published on June 10, 2022, discloses a stator structure and a large-scale aerated self-priming slurry flotation machine; Chinese patent CN203484235U, which was authorized and announced on March 19, 2014, discloses an improved stator device for a flotation machine; Chinese patent application CN104918708A published on September 16, 2015, discloses a stator for a flotation machine; Chinese patent application CN1938097A published on March 28, 2007, discloses a stator for a flotation cell; Chinese patent application CN105658335A published on June 8, 2016, discloses a stator of a gas dispersion mechanism used in a froth flotation cell; Chinese patent application CN115739406A, published on 2023-03-07, discloses a fine-grained mineral flotation device and a flotation method, which involves a double-layer stator structure, wherein the inner and outer double-layer stators include an inner stator and an outer stator, and the outer stator is located on the outside of the inner stator.

[0005] Analysis of the above-mentioned related patents revealed that: CN101722113A, CN114602662A and CN203484235U are all designed for the sorting of conventional sized mineral particles, and pay more attention to the turbulence effect of the stator blades, the processing and installation method of the blades, the structural strength and wear resistance of the overall stator and other functions.

[0006] The flotation machine stators disclosed in CN104918708A, CN1938097A, and CN105658335A are also used for the sorting of conventional particle-sized minerals. The slurry is guided by the upper and lower closed rings of the stator, the local shear rate and turbulence intensity are increased by the openings on the stator blades, and the single shear rate is overcome by adjusting the installation position of the stator blades, so that the same stator can produce different shear rates for the fluid, thereby increasing the turbulence intensity. However, the shear rate generated by the stator does not meet the requirements of collision mineralization of fine-grained minerals and the occurrence of microbubbles.

[0007] CN115739406A discloses a double-layer stator structure for the separation of fine-grained minerals, which strengthens the shearing effect of the stator and is conducive to the generation of microbubbles. However, the upper or lower ends of the inner and outer double-layer stators are open, which is not conducive to the diversion of the fluid, and the strong turbulent flow field generated by the impeller stator easily extends to the separation zone and the foam zone, which is not conducive to the low-turbulence separation of mineralized bubbles. At the same time, the three-phase mixture passing through the impeller-stator area is quickly released after leaving the impeller-stator area, and the gas content in the local area cannot be effectively improved.

[0008] Secondly, whether the upper end of the stator blade is closed or not has a great influence on the upper circulating flow field of the flotation machine. The rotation of the impeller produces a spiral upward flow. Under the guidance of the stator blade, the circumferential flow can be converted into a radial flow, but it is not a radial flow in the strict sense. It also contains a large axial velocity. Therefore, the closure of the stator blade can inhibit the axial flow, strengthen the radial flow, reduce the turbulence intensity in the middle and upper part of the trough, and create a stable sorting environment for the separation of mineralized bubbles.

[0009] After the gas is sheared and dispersed by the stator, it is quickly and evenly dispersed to the upper area of ​​the trough. The relatively open area is not conducive to the retention of gas. One of the difficulties in recovering fine-grained minerals is the low probability of mineralization due to collision with bubbles, which is specifically manifested in the mismatch between the bubble diameter and the mineral particle diameter, low initial kinetic energy and low local gas content. Summary of the invention

[0010] The purpose of the present invention is to provide a gas-liquid-solid three-phase dispersion system, which can solve the problems of insufficient local gas content in the stator of the prior art, large turbulence intensity in the middle and upper part of the tank body that destroys the stability of the foam layer, insufficient relative velocity difference between the collision mineralization of bubbles and mineral particles, and mismatch between the collision mineralization scales of fine-grained minerals and bubbles; The present invention provides a gas-liquid-solid three-phase dispersion system, comprising an inclusion and a high-turbulence dissipator, wherein the inclusion surrounds the outside of the high-turbulence dissipator, and a flotation machine impeller is arranged inside the high-turbulence dissipator; the inclusion comprises an annular cylinder wall, and a plurality of flow channel holes are arranged on the cylinder wall along an annular array; the high-turbulence dissipator comprises a plurality of blade groups arranged along an annular array, each blade group comprises at least two layers of blades arranged radially inwardly and outwardly, and each layer of blades is respectively provided with flow channel holes; the high-turbulence dissipator, the flow channel holes on the high-turbulence dissipator and the flow channel holes on the inclusion form a fluid channel.

[0011] Furthermore, the inclusion body also includes a supporting disc connected to the bottom of the cylinder wall, and an upper flow-limiting disc connected to the top of the cylinder wall, and the inner diameters of the supporting disc and the upper flow-limiting disc are both smaller than the inner diameter of the cylinder wall.

[0012] Furthermore, the high turbulence dissipator also includes a bottom closed ring connected to the bottom of the blade, and an upper closed ring connected to the top of the blade, the inner and outer diameters of the bottom closed ring and the upper closed ring are consistent, and the widths of the bottom closed ring and the upper closed ring are greater than the widths of the inner and outer layers of the blades.

[0013] Furthermore, there is a circumferential spacing between adjacent blade groups to form a flow diversion and dispersion channel 1.

[0014] Furthermore, there is a circumferential spacing between the inner and outer blades of the same blade group to form a second flow diversion and dispersion channel, and the flow area of ​​the first flow diversion and dispersion channel is larger than the flow area of ​​the second flow diversion and dispersion channel.

[0015] Furthermore, the height of the flow channel holes on the outer blades of the high-turbulence dissipator is higher than the height of the flow channel holes on the inner blades, and the height of the flow channel holes on the inclusion body is higher than the height of the flow channel holes on the outermost blades.

[0016] Furthermore, the flow channel hole on the inclusion body is located between the two outermost blades.

[0017] Furthermore, the flow channel holes on the inclusion body are elongated holes, and the length direction of the flow channel holes is consistent with the axial direction; the flow channel holes on the high turbulence dissipator are elongated holes, and the length direction of the flow channel holes is consistent with the radial direction.

[0018] Furthermore, a plurality of flow channel holes are formed on the blade, and the flow channel holes are distributed in at least two rows along the width direction and in multiple rows along the length direction, and the flow channel holes in adjacent rows of adjacent columns are staggered.

[0019] Furthermore, the blade is an airfoil shape.

[0020] The beneficial effects of the present invention are: (1) The present invention delays the outward dispersion of bubbles through the synergistic effect of high turbulence dissipators and inclusion structures, increases the gas content in local areas, increases the contact probability between fine minerals and bubbles, and thus increases the probability of collision mineralization; (2) The present invention uses an inner and outer double-layer blade structure to secondary enhance the outward discharge speed, increase the initial kinetic energy of the three-phase mixture, and enhance the initial kinetic energy of the mineral particles; (3) The collision mineralization of fine-grained minerals and bubbles requires a greater initial kinetic energy on the one hand, and a certain relative speed difference on the other hand. The traditional stator structure guides the three-phase mixture into a relatively open flow field environment (the ratio of the stator diameter to the tank diameter is generally between 0.45 and 0.2). The local turbulent dissipation rate is not increased until it collides with the tank wall. Before reaching the wall, the energy is slowly dissipated, which is particularly unfavorable for generating the speed difference required for the collision mineralization of fine-grained mineral particles and bubbles. The present invention provides inclusions around the high turbulence dissipator, which strengthens the energy dissipation and increases the local turbulence intensity, which is conducive to forming a larger collision mineralization speed difference. (4) The high turbulence dissipator and inclusion structure of the present invention creates a multiple strong shear environment for the gas, which promotes the generation of microbubbles. At the same time, at a higher jet velocity, it is conducive to promoting the precipitation of nanobubbles, thereby producing precipitation mineralization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Exploded view of; Figure 3 It is a front view of the present invention; Figure 4 For the present invention Figure 3 AA section view; Figure 5 It is a schematic diagram of the structure of the airfoil blade of the present invention; Figure 6 A top view of the present invention; Figure 7 For the present invention Figure 6 BB cross-sectional view; Figure 8 It is a schematic diagram of the flow direction of the gas-liquid mixture when passing through the blades of the present invention; Fig. 9 Schematic diagram of the flow of the gas-liquid-solid three-phase mixture between the high-turbulence dissipator and the inclusion body of the present invention, wherein the solid line represents the slurry flow direction and the dotted line represents the gas flow direction; Description of reference numerals: 1- inclusion body; 11- cylinder wall; 12- support disc; 121- mounting bolt hole; 13- upper flow limiting disc; 14- reinforcing rib plate; 2-high turbulence dissipator; 21-blade group; 22-blade; 23-bottom closed ring; 231-stator mounting hole; 24-upper closed ring; 25-flow diversion and dispersion channel 1; 26-flow diversion and dispersion channel 2; 3-flow channel hole; 4-flotation machine impeller; 5-fluid channel. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The main problem of fine and micro-fine minerals being difficult to recover is that they have small particle size, light momentum, and large specific surface area. In the actual flotation process, there are problems such as low probability of collision between particles and bubbles, low flotation rate, and easy entrainment. Among them, the low probability of collision is the key to affecting the recovery of micro-fine minerals. The present invention mainly solves the following four technical problems: 1) The problem of insufficient local gas content: The impeller stator area is the main area where collision mineralization occurs. Through the synergistic effect of the high turbulence dissipator 2 & inclusion 1 structure, the outward dispersion of bubbles is delayed, the gas content in the local area is increased, and the contact probability between fine-grained minerals and bubbles is increased, thereby increasing the probability of collision mineralization; 2) The turbulence intensity in the middle and upper part of the trough is high, which destroys the stability of the foam layer: The airfoil-shaped double-layer blade 22 structure secondary strengthens the outward discharge speed, increases the initial kinetic energy of the three-phase mixture, and improves the initial kinetic energy of the mineral particles, but also increases the axial flow velocity to a certain extent. The turbulence intensity in the middle and upper part of the trough increases, which is not conducive to the separation of mineralized bubbles. The closed structure of high turbulence dissipator 2 and inclusion 1 structure is adopted to further construct a radial flow channel, ensuring a relatively stable sorting environment in the middle and upper part of the trough.

[0027] 3) The problem of insufficient relative velocity difference between bubbles and mineral particles in collision mineralization: The collision mineralization of fine-grained minerals and bubbles requires greater initial kinetic energy on the one hand, and a certain relative velocity difference on the other hand. The traditional stator structure guides the three-phase mixture into a relatively open flow field environment (the ratio of the stator diameter to the tank diameter is generally between 0.45-0.2). The local turbulent dissipation rate is not increased until it collides with the tank wall. Before reaching the wall, the energy is slowly dissipated, which is particularly unfavorable for generating the velocity difference required for the collision mineralization of fine-grained mineral particles and bubbles. Arranging the inclusion 1 around the high turbulence dissipator 2 enhances the energy dissipation and increases the local turbulence intensity, which is conducive to forming a larger collision mineralization velocity difference.

[0028] 4) The problem of mismatch in scale of mineralization caused by collision between fine-grained minerals and bubbles: The high turbulence dissipator 2 & inclusion 1 structure creates a multiple strong shear environment for the gas, which promotes the generation of microbubbles. At the same time, at a higher jet velocity, it is conducive to promoting the precipitation of nanobubbles, thereby producing precipitation mineralization.

[0029] Example 1 like Figure 1-Figure 9 As shown, the present invention provides a gas-liquid-solid three-phase dispersion system, including an inclusion 1 and a high-turbulence dissipator 2, the inclusion 1 surrounds the outside of the high-turbulence dissipator 2, and the flotation machine impeller 4 is arranged on the inside of the high-turbulence dissipator 2; the inclusion 1 includes an annular cylinder wall 11, and a plurality of flow channel holes 3 are arranged along an annular array on the cylinder wall 11; the high-turbulence dissipator 2 includes a plurality of blade groups 21 arranged along an annular array, each blade group 21 includes at least two layers of blades 22 arranged radially inside and outside, and each layer of blades 22 is respectively provided with flow channel holes 3; the high-turbulence dissipator 2, the flow channel holes 3 on the high-turbulence dissipator 2 and the flow channel holes 3 on the inclusion 1 form a fluid channel 5.

[0030] Specifically, the strongly constrained high turbulence dissipation rate gas-liquid-solid three-phase mixing and dispersion system is composed of a high turbulence dissipator 2, an inclusion 1 and the flow channel formed. The structure of the high turbulence dissipator 2 is coaxial with the structure of the inclusion 1, and the bottom is installed horizontally. The high turbulence dissipator 2 and the inclusion 1 are fixed to the corresponding legs by bolt connection. The inner side of the high turbulence dissipator 2 is the installation space position of the flotation machine impeller 4. The illustration in the present invention is only for a better understanding of the function of the gas-liquid-solid three-phase dispersion system, and does not belong to the part of the present invention.

[0031] The diameter of the inclusion 1 is between 1.1 and 1.3 times the outer diameter of the high turbulence dissipator 2, and is adjusted according to the size of the mineral particles. The finer the mineral particles, the smaller the diameter of the inclusion 1. The height is between 1.05 and 1.25 times the height of the high turbulence dissipator 2, and is installed coaxially with the stator structure. The flow channel hole 3 on the inclusion 1 structure is located in the middle and upper area, and is in the shape of a long hole. The number of openings is consistent with the number of single-layer stator blades 22, and the total area of ​​the openings is 1 / 8-1 / 4 of the area of ​​the inclusion 1. The upper end of the long hole starts the opening position at the 1 / 8-1 / 7 height position of the inclusion 1, and the lower end is about 1 / 2 height position of the inclusion 1.

[0032] The structure of high turbulence dissipator 2 is as follows Figure 2 As shown in / 4 / 5 / 8, the overall structure of the inner and outer double-layer blades 22 is basically the same, the shape is an airfoil, the length, width and height are the same, and only the number of openings on the blades 22 is different. The openings on the blades 22 are long strip flow channel holes 3, the number is 3 to 8, the length of the long strip flow channel holes 3 is about 1 / 4-2 / 5 of the width of the sub-blade 22, and the width is 1 / 12-1 / 8 of the width of the stator blade 22. The outer diameter of the inner blade 22 is consistent with the inner diameter of the outer blade 22. The inner diameter and outer diameter of the high turbulence dissipator 2 have a certain difference depending on the volume of the flotation machine, generally within the range of 0.15-0.45 of the tank diameter. The larger the tank volume, the smaller the value.

[0033] Example 2 The inclusion body 1 further includes a support disc 12 connected to the bottom of the cylinder wall 11, and an upper flow-limiting disc 13 connected to the top of the cylinder wall 11, and the inner diameters of the support disc 12 and the upper flow-limiting disc 13 are both smaller than the inner diameter of the cylinder wall 11. The high turbulence dissipator 2 also includes a bottom closed ring 23 connected to the bottom of the blade 22, and an upper closed ring 24 connected to the top of the blade 22, the inner and outer diameters of the bottom closed ring 23 and the upper closed ring 24 are consistent, and the widths of the bottom closed ring and the upper closed ring are greater than the widths of the inner and outer blades 22.

[0034] Specifically, the inclusion body 1 is a cylindrical structure, with four reinforcing ribs 14 arranged on the outside, which are evenly distributed circumferentially to strengthen the structural strength of the cylinder wall 11. The inner diameters of the support disc 12 and the upper flow-limiting disc 13 are smaller than the cylinder wall 11, which are about 9 / 10-8 / 9 of the cylinder diameter, and the wall fluid directly enters the upper area of ​​the tank body upward. The outer diameters of the upper flow-limiting disc 13 and the lower support disc 12 are determined by the upper and lower widths of the reinforcing ribs 14, and the smaller the better while ensuring the strength. The lower support disc 12 is provided with four mounting bolt holes 121, which are evenly distributed circumferentially and are located between the two reinforcing ribs 14. The main purpose of the reinforcing ribs 14 is to strengthen the structural strength of the cylinder wall 11, and the mounting holes are set according to the size of the equipment to ensure a firm installation.

[0035] The structure of the high turbulence dissipator 2 includes an upper closed ring 24, a bottom closed ring 23, an annular structure in which inner and outer layers of radial blades 22 are arranged, and a guide and dispersion channel 1 25 and a guide and dispersion channel 2 26 formed by the inner and outer layers of wing blades 22. The openings on the blades 22 are in the shape of long strips. The number of inner and outer double-layer blades 22 is 16-28, which are evenly distributed along the circumferential direction. The circumferential angle between the inner and outer stator blades 22 of the same blade group 21 is 3-8°. The upper closed ring 24 of the high turbulence dissipator 2 is consistent with the inner and outer diameters of the bottom closed ring 23, completely covering the width of the stator blades 22. The bottom closed ring 23 is provided with a stator mounting hole 231 to fix the high turbulence dissipator 2 on the corresponding legs in the flotation machine cell.

[0036] During the installation process, the bottom support disc 12 of the inclusion body 1 is level with the bottom closed ring 23 of the high turbulence dissipator 2 .

[0037] Example 3 There is a circumferential spacing between adjacent blade groups 21 to form a guide and dispersion channel 1 25. There is a circumferential spacing between the inner and outer blades 22 of the same blade group 21 to form a guide and dispersion channel 2 26, and the flow area of ​​the guide and dispersion channel 1 25 is larger than the flow area of ​​the guide and dispersion channel 2 26.

[0038] Specifically, the inner and outer two blades 22 of adjacent different blade groups 21 constitute the diversion and dispersion channel 1 25, and the inner and outer two blades 22 of the same blade group 21 constitute the diversion and dispersion channel 2 26. The flow area of ​​the diversion and dispersion channel 2 26 is smaller. Under the diversion effect of the inner wing blade 22, the three-phase flow velocity is accelerated and divided into two flows by the outer wing blade 22, and the flow velocity is further enhanced. The number of blade groups 21 (inner and outer blades 22) is 16-28, which are evenly distributed along the circumference; the circumferential angle of the inner and outer stator blades 22 of the same blade group 21 (i.e., the diversion and dispersion channel 2 26) is 3-8°.

[0039] Example 4 The height of the flow hole 3 on the outer blade 22 of the high turbulence dissipator 2 is higher than the height of the flow hole 3 on the inner blade 22, and the height of the flow hole 3 on the inclusion body 1 is higher than the height of the flow hole 3 on the outermost blade 22. The flow hole 3 on the inclusion body 1 is between the two outermost blades 22. The flow hole 3 on the inclusion body 1 is a long hole, and the length direction of the flow hole 3 is consistent with the axial direction; the flow hole 3 on the high turbulence dissipator 2 is a long hole, and the length direction of the flow hole 3 is consistent with the radial direction. A plurality of flow holes 3 are provided on the blade 22, and the flow holes 3 are distributed in at least two rows along the width direction and in multiple rows along the length direction, and the flow holes 3 in adjacent rows of adjacent columns are staggered.

[0040] Specifically, the flow channel holes 3 of the inner and outer blades 22 are located in the upper and middle parts of the blades 22 (within the range of 1 / 10-1 / 2 of the height of the blades 22), and are arranged horizontally along the length direction. The openings of the inner blades 22 are 1 / 10 of the height of the blades 22 lower than those of the outer blades 22. The heights of the openings on the inner and outer blades 22 are related to the oblique upward movement path of the fluid between the stator blades 22.

[0041] The length direction of the long channel hole 3 on the inclusion body 1 is consistent with the axial direction, and the highest position of the opening is higher than the opening position height of the outer blade 22 of the high turbulence dissipator 2. The long channel holes 3 are evenly arranged in the circumferential direction and arranged between the two blades 22 of the outer layer of the high turbulence dissipator 2.

[0042] The high turbulence dissipator 2 has long holes on the inner and outer double-layer blades 22. The holes are located in the upper middle part of the blade 22 (within the range of 1 / 10-1 / 2 of the height of the stator blade 22), and the long holes are arranged horizontally along the length direction. Two rows of long holes are opened on a single blade 22, with a total number of 3-8 holes, which are arranged interlaced between layers. The distance between two adjacent long holes is 1 / 24-1 / 20 of the height of the blade 22, and the parallel distance between the two rows of long holes is 1 / 4-1 / 3 of the width of the blade 22. The length of a single long hole is 1 / 2-3 / 5 of the width of the blade 22, and the width is 1 / 24-1 / 20 of the height of the blade 22. The opening of the inner blade 22 is 1 / 10 of the height of the blade 22 lower than that of the outer blade 22.

[0043] Example 5 The blades 22 are of airfoil type.

[0044] Specifically, the inner and outer double-layer blades 22 are both wing-shaped structures, with the same length, width and height dimensions, and only the heights of the flow channel holes 3 on the blades 22 are different. Under the flow guidance of the inner wing blades 22, the three-phase flow velocity is accelerated and divided into two flows by the outer wing blades 22, and the flow velocity is further enhanced.

[0045] The simulation results show that the power density in the area of ​​the strongly constrained high turbulence dissipation rate gas-liquid-solid three-phase mixing and dispersion system reaches 413kW / m³, while the power density in the conventional stator area is 8kW / m³. The local high power density is conducive to the strong shear dispersion of the gas-liquid-solid three-phase mixture, forming microbubbles with smaller diameters, generating the relative motion speed required for mineral particles and bubbles, and increasing the probability of collision mineralization. Laboratory clean water test research shows that the bubble diameter generated by the strongly constrained high turbulence dissipation rate gas-liquid-solid three-phase mixing and dispersion system is about 0.1mm, which is smaller than the bubble diameter generated by the conventional stator structure and smaller than the bubble diameter generated by the standard KYF impeller.

[0046] The gas-liquid-solid three-phase dispersion system was applied to a fine-particle phosphorus flotation plant in Chengde area. The processing capacity of the fine-particle phosphorus flotation plant was 930t / d, and the material particle size of -0.038μm accounted for 80%. The process flow was 1 roughing, 1 sweeping and 3 fine operations. The roughing operation was equipped with 3 16m³ flotation machines, of which the stator structure of the third flotation machine was replaced with a gas-liquid-solid three-phase dispersion system. The first flotation machine of the roughing operation was selected for 72h raw fine tail sampling and analysis. Sampling was performed every 8h, and the 9 samples were combined into a comprehensive sample for statistical analysis. The average indicators of the test are shown in Table 1.

[0047] Table 1 Industrial test indicators of two different mixed dispersion systems

[0048] The results of the 72-hour industrial test show that the gas-liquid-solid three-phase dispersion system has higher recovery rate and mineral processing efficiency than the conventional substructure, and is more conducive to the efficient recovery of fine-particle minerals.

[0049] Working principle of the present invention: The structure of inclusion 1 outside the high turbulence dissipator 2 achieves the isolation of the strong turbulence collision mineralization environment inside inclusion 1 from the relatively low turbulence sorting environment outside inclusion 1. The constructed fluid environment matches the flotation dynamics environment required for fine-grained minerals, realizing the technical idea of ​​"high turbulence mineralization and low turbulence sorting" for fine-grained minerals. At the same time, the structure of inclusion 1 delays the discharge of gas, increases the residence time of bubbles in the collision mineralization area, and increases the gas content inside the annular closed area, which is conducive to increasing the probability of collision mineralization between fine-grained minerals and bubbles.

[0050] The double-layer blade 22 structural design of the high-turbulence dissipator 2 increases the number of times the same fluid unit is sheared and dispersed by the double-layer blade 22. At the same time, the openings on the blade 22 increase the local turbulence dissipation rate, which is beneficial to reducing the diameter of the bubbles and generating more microbubbles. At the same time, as the wing blades 22 accelerate the fluid, the local outward discharge flow rate increases rapidly and generates a large dynamic pressure, which is beneficial to the precipitation of micro-nano bubbles, thereby producing a precipitation mineralization effect and further enhancing the recovery of fine-grained minerals.

[0051] The high turbulence dissipator 2 is closed at the top and bottom with discs. The closed disc structure guides the fluid discharged obliquely upward from the impeller into a horizontal radial flow, reducing the turbulence intensity in the middle and upper part of the tank body and forming a relatively stable sorting environment for mineralized bubbles.

[0052] The long strip holes around the inclusion 1 realize further shear dispersion of the gas-liquid-solid three-phase mixture, and further transform the rotating flow generated by the impeller into a radial flow, thereby realizing efficient dispersion of gas and liquid.

[0053] The high turbulence dissipator 2 and inclusion 1 structure increases the turbulence intensity in the high turbulence dissipator 2 and inclusion 1 regions. Under the premise of unchanged energy input, a local high turbulence region is constructed in the trough body, the power density is greatly improved, and high turbulence mineralization and low turbulence sorting of fine-grained minerals are achieved, the local energy dissipation is increased, and the speed difference required for the collision mineralization of mineral particles and bubbles is improved.

[0054] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas-liquid-solid three-phase dispersion system, characterized in that: It comprises an inclusion and a high turbulence dissipator, wherein the inclusion surrounds the outside of the high turbulence dissipator, and the flotation machine impeller is arranged inside the high turbulence dissipator; The inclusion body comprises an annular cylinder wall, on which a plurality of flow channel holes are arranged along an annular array; The high turbulence dissipator comprises a plurality of blade groups arranged in an annular array, each blade group comprises at least two layers of blades arranged radially inwardly and outwardly, and each layer of blades is provided with flow channel holes; The high turbulence dissipator, the flow channel holes on the high turbulence dissipator and the flow channel holes on the inclusion form a fluid channel.

2. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The inclusion body also includes a support disc connected to the bottom of the cylinder wall and an upper flow-limiting disc connected to the top of the cylinder wall, and the inner diameters of the support disc and the upper flow-limiting disc are both smaller than the inner diameter of the cylinder wall.

3. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The high turbulence dissipator also includes a bottom closed ring connected to the bottom of the blade, and an upper closed ring connected to the top of the blade. The inner and outer diameters of the bottom closed ring and the upper closed ring are consistent, and the widths of the bottom closed ring and the upper closed ring are greater than the widths of the inner and outer layers of the blades.

4. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: There is a circumferential spacing between adjacent blade groups to form a flow guide and dispersion channel 1.

5. The gas-liquid-solid three-phase dispersion system according to claim 4, characterized in that: There is a circumferential spacing between the inner and outer blades of the same blade group to form a second flow diversion and dispersion channel, and the flow area of ​​the first flow diversion and dispersion channel is larger than the flow area of ​​the second flow diversion and dispersion channel.

6. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The height of the flow channel holes on the outer blades of the high turbulence dissipator is higher than that of the flow channel holes on the inner blades, and the height of the flow channel holes on the inclusion body is higher than that of the flow channel holes on the outermost blades.

7. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The flow channel hole on the inclusion body is between the two outermost blades.

8. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The flow channel holes on the inclusion body are long strip holes, and the length direction of the flow channel holes is consistent with the axial direction; the flow channel holes on the high turbulence dissipator are long strip holes, and the length direction of the flow channel holes is consistent with the radial direction.

9. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The blade is provided with a plurality of flow channel holes, and the flow channel holes are distributed in at least two rows along the width direction and in a plurality of rows along the length direction, and the flow channel holes in adjacent rows of adjacent rows are staggered.

10. The gas-liquid-solid three-phase dispersion system according to claim 1, characterized in that: The blades are airfoil shaped.

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