A space-constrained counter-rotating pulp preprocessor

Abstract

The present invention discloses a counter-rotating pulp preprocessor based on space limitation, comprising: a pulp mixing tank with an accommodation cavity inside, and a pulp inlet and a pulp outlet communicating with the accommodation cavity are formed on the outer wall of the pulp mixing tank; wherein, a chemical adding pipe communicating with the accommodation cavity is further arranged on the pulp mixing tank; a stirring assembly including a stirring shaft and at least two stirring impellers arranged on the stirring shaft, and at least two of the stirring impellers are arranged facing each other; a driving assembly installed on the pulp mixing tank and connected to the stirring shaft, configured to drive the stirring shaft to rotate so that at least two stirring impellers generate opposite radial flows and the same circumferential flow; a stirring mesh cover sleeved outside the stirring assembly, with the upper end detachably connected to the pulp mixing tank, the lower end being open and communicating with the accommodation cavity, and diversion holes are formed on the peripheral wall of the stirring mesh cover.

Description

Technical Field

[0001] The present invention relates to the field of mineral processing equipment, and in particular to a counter-rotating slurry preprocessor based on space limitation. Background Art

[0002] Flotation is the process of separating target minerals from gangue minerals by utilizing the difference in hydrophilicity and hydrophobicity on the surface of minerals. It is the most widely used separation method today and plays a vital role in coal preparation and ore dressing. For flotation, the difference in mineral surface properties determines the effectiveness of flotation, so it is particularly important to strengthen the difference in surface properties between target minerals and gangue minerals. The agitator or slurry pre-treater is the most common counter-rotating slurry pre-treater based on space confinement, and is a power device that enables the adsorption of reagents on the mineral surface. The main functions of slurry pre-treatment are: ① Mixing the slurry to prevent precipitation; ② Thoroughly mixing the flotation reagent with the slurry; ③ Adsorbing the collector, regulator, etc. to the surface of the target ore particles to improve the surface properties and floatability of the minerals.

[0003] With the rapid development of the national economy, the demand for mineral resources is increasing, the scale of mineral resource development is constantly expanding, the rich are gradually exhausted, the continuous deterioration of resource conditions and the continuous improvement of product quality requirements have become prominent contradictions in the development and utilization of mineral resources. The embedded particle size of mineral resources is becoming increasingly fine, and the characteristics of poor and impure materials are becoming more and more prominent. Its low mineral processing efficiency is one of the major issues that need to be urgently solved in the mineral processing industry today. As the particle size of mineral particles decreases, they show characteristics such as small mass, high surface energy, and large specific surface area. Traditional mixing barrels or slurry pre-processors are difficult to achieve effective slurry adjustment due to low turbulence, that is, the interaction between fine minerals and reagent molecules is weak, and the reagent is difficult to complete adsorption efficiently, and cannot effectively enhance the surface property difference between the target mineral and the gangue mineral, which seriously affects the subsequent flotation effect. Based on this, the present invention designs a counter-rotating slurry pre-processor based on space limitation. By adding a stirring mesh cover and a counter-rotating impeller, the high turbulence of the flow field in the pre-processor is enhanced, and the microscopic turbulent vortex is appropriately increased to achieve efficient and effective collision between the reagent and the particles, thereby enhancing the adsorption of the reagent on the mineral surface. Summary of the Invention

[0004] In response to the problems and needs raised above, this solution proposes a space-constrained counter-rotating slurry preprocessor. Due to the adoption of the following technical features, it can achieve the above technical objectives and bring about many other technical effects.

[0005] The present invention proposes a space-constrained counter-rotating slurry preprocessor, comprising:

[0006] A slurry mixing barrel has an internal accommodating cavity, and a slurry inlet and a slurry outlet connected to the accommodating cavity are provided on the outer wall of the slurry mixing barrel; wherein the slurry mixing barrel is also provided with a dosing pipe connected to the accommodating cavity;

[0007] The stirring assembly includes a stirring shaft and at least two stirring impellers arranged on the stirring shaft, and the at least two stirring impellers are arranged facing each other;

[0008] The driving assembly is installed on the sizing barrel and connected to the stirring shaft, and is configured to drive the stirring shaft to rotate so that at least two stirring impellers generate opposite radial flows and the same circumferential flow;

[0009] The stirring mesh cover is sleeved outside the stirring assembly, the upper end is detachably connected to the sizing barrel, the lower end is open and communicates with the accommodating cavity, and diversion holes are formed in the peripheral wall of the stirring mesh cover.

[0010] In this technical solution, the driving assembly drives the stirring shaft to rotate, so that a pair of counter-flow stirring impellers provided thereon generate opposite radial flows and the same circumferential flow. The pulp enters the sizing barrel from the pulp inlet, and the pulp enters the sizing barrel along the rotation direction of the impeller. The lower stirring impeller forms an upward circumferential flow and radial flow in the stirring mesh cover, and the upper stirring impeller generates a downward circumferential flow and radial flow, and the two form a counter-flow turbulence. During this process, the pressure pipe injects the medicament into the accommodating cavity, which is fully mixed with the pulp. The pulp inside the stirring mesh cover further forms a micro-turbulence vortex along the diversion holes of the stirring mesh cover, and further collides with the side wall of the sizing barrel, significantly improving the pulp turbulence degree and chaos degree, and finally overflowing from the pulp outlet of the sizing barrel; this device can strengthen the high turbulence degree of the flow field, appropriately increase the micro-turbulence vortex, realize the efficient and effective collision between the medicament and the particles, and thus strengthen the adsorption of the medicament on the mineral surface.

[0011] In addition, the counter-rotating pulp preprocessor based on space limitation according to the present invention may further have the following technical features:

[0012] In an example of the present invention, the diversion holes include a plurality of them, and are arranged in an array along the circumferential direction and the axial direction of the stirring mesh cover.

[0013] In an example of the present invention, the included angle between the opening direction of the diversion hole and the instantaneous rotation tangential direction of the stirring impeller at the diversion hole during rotation is 0° to 90°.

[0014] In an example of the present invention, it further includes: a baffle plate,

[0015] The baffle plate is fixedly arranged on the inner wall of the sizing barrel and at least covers the diversion holes formed in the stirring mesh cover, so that the direction of the pulp is changed under the action of the baffle plate when the pulp jets out through the diversion holes.

[0016] In an example of the present invention, the medicament adding pipe is arranged inside the stirring mesh cover, and the end of the medicament adding pipe is located at the middle position between two adjacent stirring impellers.

[0017] In an example of the present invention, the slurry inlet is provided at the lower end of the sizing bucket, and the arrangement direction of the slurry inlet is tangent to the circumferential direction of the sizing bucket wall.

[0018] In an example of the present invention, there are two slurry outlets, one of which is arranged near the upper end of the sizing bucket, and the other is arranged near the lower end of the sizing bucket.

[0019] In an example of the present invention, the upper end of the stirring screen cover is connected to the sizing bucket by a threaded connection or a snap connection.

[0020] In an example of the present invention, a bracket is provided at the lower end of the stirring screen cover, and the bracket is fixedly connected to the sizing bucket.

[0021] In an example of the present invention, the structure of the diversion hole is one of an arc shape, a tooth shape, and a shape without a diversion arm.

[0022] The advantages and beneficial effects of the present invention are as follows:

[0023] 1. The pulp enters tangentially at the slurry inlet and moves tangentially along the rotation direction of the stirring impeller, reducing the resistance of the pulp transported to the pre-processor; by setting the stirring screen cover, a local sizing chamber is formed inside the stirring bucket, strengthening the turbulence intensity of the flow field and enhancing the interaction between the reagent and the mineral surface; at the same time, when the pulp flows through the diversion holes on the stirring screen cover, micro-vortex flows will be formed, further strengthening its sizing effect, strengthening the dispersion and adsorption of the reagent; the pulp ejected through the diversion holes changes the flow direction of the pulp after encountering the baffle, which will enhance its turbulence intensity, thereby further strengthening the sizing effect.

[0024] 2. The rotation direction of the stirring impeller of the present invention, the rotation direction of the pulp, and the opening direction of the diversion holes in the circumferential direction are all the same, which can strengthen the collision between the pulp and the stirring baffle, strengthen the turbulence intensity. The combined use of the impact-type impeller and the stirring screen cover can increase the pressure inside the local sizing chamber, enhance the impact effect. At the same time, due to the huge pressure difference inside and outside the stirring screen cover, the pulp enters the sizing bucket through negative pressure, achieving the purpose of energy saving.

[0025] In the following, the optimal embodiments of implementing the present invention will be described in more detail with reference to the accompanying drawings, so as to easily understand the features and advantages of the present invention. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly introduced below. Among them, the accompanying drawings are only used to show some embodiments of the present invention, rather than limiting all embodiments of the present invention thereto.

[0027] Figure 1Schematic structural diagram of a space-constrained counter-rotating pulp preprocessor according to an embodiment of the present invention;

[0028] Figure 2 Front view of a stirring mesh cover according to an embodiment of the present invention;

[0029] Figure 3 Side view of a stirring mesh cover according to an embodiment of the present invention.

[0030] List of reference numerals:

[0031] Space-constrained counter-rotating pulp preprocessor 100;

[0032] Slurry mixing tank 110;

[0033] Accommodation cavity 111;

[0034] Feed inlet 112;

[0035] Discharge outlet 113;

[0036] Chemical addition pipe 114;

[0037] Stirring assembly 120;

[0038] Stirring shaft 121;

[0039] Stirring impeller 122;

[0040] Drive assembly 130;

[0041] Motor 131;

[0042] Belt 132;

[0043] Stirring mesh cover 140;

[0044] Flow guide hole 141;

[0045] Bracket 142;

[0046] Baffle 150;

[0047] Axial direction X;

[0048] Circumferential direction Y. Detailed implementation manner

[0049] In order to make the objectives, technical solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of specific embodiments of the present invention. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0050] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second", and similar terms used in the specification and claims of this patent application for the present invention do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily indicate a quantity limitation. Terms such as "comprising" or "including" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0051] According to a kind of space-limited counter-rotating pulp preprocessor 100 of the present invention, as Figures 1 to 3 shown, it includes:

[0052] A slurry mixing tank 110, which has an accommodation cavity 111 inside, and a slurry inlet 112 and a slurry outlet 113 communicating with the accommodation cavity 111 are provided on the outer wall of the slurry mixing tank 110; wherein, a chemical addition pipe 114 communicating with the accommodation cavity 111 is further provided on the slurry mixing tank 110;

[0053] A stirring assembly 120, including a stirring shaft 121 and at least two stirring impellers 122 provided on the stirring shaft 121, and at least two of the stirring impellers 122 are arranged facing each other;

[0054] A driving assembly 130, installed on the slurry mixing tank 110 and connected to the stirring shaft 121, configured to drive the stirring shaft 121 to rotate so that at least two stirring impellers 122 generate opposite radial flows and the same circumferential flow; for example, the driving assembly 130 includes a motor 131, and the power between the output shaft of the motor 131 and the stirring shaft 121 is transmitted through a belt 132.

[0055] The stirring screen cover 140 is sleeved on the outside of the stirring assembly 120, with its upper end detachably connected to the sizing barrel 110, its lower end being open and communicating with the accommodating cavity 111, and a diversion hole 141 being formed on the peripheral wall of the stirring screen cover 140.

[0056] Driven by the driving assembly 130, the stirring shaft 121 rotates to make a pair of convective stirring impellers 122 provided thereon generate opposite radial flows and the same circumferential flow. The pulp enters the sizing barrel 110 from the pulp inlet 112, and the pulp enters the sizing barrel 110 along the rotation direction of the impeller. The lower stirring impeller 122 forms an upward circumferential flow and radial flow within the stirring screen cover 140, and the upper stirring impeller 122 generates a downward circumferential flow and radial flow. The two form a convective turbulence. During this process, the pressure pipe injects the medicament into the interior of the accommodating cavity 111, which is fully mixed with the pulp. The pulp inside the stirring screen cover 140 further forms a micro-turbulence vortex along the diversion holes 141 of the stirring screen cover 140, and further collides with the side wall of the sizing barrel 110, significantly increasing the pulp turbulence degree and chaos degree. Finally, it overflows from the pulp outlet 113 of the sizing barrel 110; this device can strengthen the high turbulence degree of the flow field, appropriately increase the micro-turbulence vortices, realize the efficient and effective collision between the medicament and the particles, and thus strengthen the adsorption of the medicament on the mineral surface.

[0057] Preferably, the blades of the stirring impeller 122 have two forms: turbine type and propeller type, and can be selected according to the pulp.

[0058] In an example of the present invention, the diversion holes 141 include a plurality of them, and are arranged in an array along the circumferential direction Y and the axial direction X of the stirring screen cover 140;

[0059] By arranging a plurality of diversion holes 141 in an array, the pulp can be ejected from the stirring screen cover 140 more uniformly, so as to form a uniform micro-turbulence vortex on the surface of the stirring screen cover 140, and then further collide with the wall of the sizing barrel 110, more significantly increasing the pulp turbulence degree and chaos degree.

[0060] In an example of the present invention, the included angle between the opening direction of the diversion hole 141 and the instantaneous rotation tangential direction of the stirring impeller 122 at the diversion hole 141 during rotation is 0° to 90°;

[0061] That is to say, the instantaneous rotation direction of the stirring impeller 122 is tangent to the wall of the pulp mixing tank 110, and the opening direction of the diversion hole forms an acute angle with the rotation tangential direction; in short, under the above structure, the pulp rotates in the pulp mixing tank 110 driven by the stirring impeller 122 and can be ejected from the diversion hole 141 along the trend. The rotation direction of the stirring impeller 122, the circumferential opening direction of the diversion hole 141 and the pulp rotation direction of the tangential feed inlet 112 at the bottom of the pulp mixing tank 110 are consistent in the circumferential direction Y, which can strengthen the collision between the pulp and the wall of the pulp mixing tank 110 and strengthen the turbulence intensity.

[0062] In an example of the present invention, it further includes: a baffle 150,

[0063] The baffle 150 is fixedly arranged on the inner wall of the pulp mixing tank 110 and at least covers the diversion holes 141 opened on the stirring mesh cover 140, so that the direction of the pulp ejected through the diversion holes 141 is changed under the action of the baffle 150;

[0064] That is to say, the pulp ejected through the diversion holes 141 of the stirring mesh cover 140 collides sufficiently with the baffle 150, thereby changing the flow direction of the pulp and then strengthening the turbulence intensity.

[0065] In an example of the present invention, the chemical addition pipe 114 is arranged inside the stirring mesh cover 140, and the end of the chemical addition pipe 114 is located at the middle position between two adjacent stirring impellers 122;

[0066] Due to the combined use of the impact - type stirring impeller 122 and the stirring mesh cover 140, the pressure in the local accommodation cavity 111 can be increased and the impact effect can be improved. Therefore, arranging the chemical addition pipe 114 inside the stirring mesh cover 140 can make the chemical agent and the pulp mix more fully. The middle position between the two stirring impellers 122 is the position with the best impact effect. Therefore, preferably, the end of the chemical addition pipe 114 is arranged at the middle position between two adjacent stirring impellers 122.

[0067] In an example of the present invention, the feed inlet 112 is arranged at the lower end of the pulp mixing tank 110, and the arrangement direction of the feed inlet 112 is tangent to the circumferential direction Y of the wall of the pulp mixing tank 110;

[0068] Due to the huge pressure difference inside and outside the stirring mesh cover 140, arranging the feed inlet 112 at the lower end of the pulp mixing tank 110 can facilitate the negative - pressure entry of the pulp into the pulp mixing tank 110, and the arrangement direction of the feed inlet 112 being tangent to the circumferential direction Y of the wall of the pulp mixing tank 110 can make the direction of the pulp entering the pulp mixing tank 110 consistent with the instantaneous rotation direction of the impeller and the opening direction of the diversion hole 141, strengthening the collision between the pulp and the wall of the pulp mixing tank 110 and strengthening the turbulence intensity.

[0069] In an example of the present invention, there are two slurry outlets 113, one of which is arranged near the upper end of the slurry mixing barrel 110, and the other is arranged near the lower end of the slurry mixing barrel 110;

[0070] That is to say, after the ore slurry is sprayed through the stirring screen cover 140 and collides with the baffle 150, a part of it will flow out through the slurry outlet 113 near the upper end of the slurry mixing barrel 110, and the other part will flow out through the slurry outlet 113 near the lower end of the slurry mixing barrel 110; at the same time, the slurry outlet 113 arranged near the lower end of the slurry mixing barrel 110 can also facilitate the later maintenance and cleaning of the adjusting barrel.

[0071] In an example of the present invention, the upper end of the stirring screen cover 140 is connected to the slurry mixing barrel 110 by a threaded connection or a snap connection;

[0072] For example, in the stirring screen cover 140 and the slurry mixing barrel 110, one of them is configured with an external thread, and the other is configured with an internal thread adapted to the external thread. The threaded connection can facilitate the disassembly and assembly between the stirring screen cover 140 and the slurry mixing barrel 110.

[0073] Also for example, a snap member is arranged between the stirring screen cover 140 and the slurry mixing barrel 110, and the two are effectively snapped together through the snap member.

[0074] The stirring screen cover 140 of the present invention has various forms, can be applicable to various ore slurries, meet various slurry mixing requirements, is convenient for assembly and disassembly, and is convenient for equipment replacement and maintenance.

[0075] In an example of the present invention, a bracket 142 is arranged at the lower end of the stirring screen cover 140, and the bracket 142 is fixedly connected to the slurry mixing barrel 110;

[0076] In order to further improve the reliability of the connection between the stirring screen cover 140 and the slurry mixing barrel 110, a bracket 142 is arranged at the other end of the stirring screen cover 140. The bracket 142 extends along the radial direction of the stirring screen cover 140 away from the stirring screen cover 140 and abuts against the inner wall of the slurry mixing barrel 110 (for example, abuts against the baffle 150), and then the bracket 142 and the baffle 150 are fixedly connected through a fastener (for example, a bolt). This connection method can effectively fix the connection between the stirring screen cover 140 and the slurry mixing barrel 110, and is convenient for disassembly and assembly.

[0077] In an example of the present invention, the structure of the diversion hole 141 is one of an arc shape, a tooth shape, and a shape without a diversion arm;

[0078] The described stirring screen cover 140 is cylindrical in shape, and the side wall opening form is a diversion hole 141. The shape of the diversion hole 141 is diverse, including various forms such as arc-shaped, toothed, and without a diversion wall, etc. The chamfers at both ends of the slot opening are 0 - 90 degrees, and its opening ratio reaches 50% - 75%.

[0079] It should be noted that the present invention is applicable to the pretreatment before the flotation of coarse and fine-grained minerals, and is particularly applicable to the pulp conditioning pretreatment before the flotation of fine minerals.

[0080] In the foregoing, the exemplary embodiments of the counter-rotating pulp preprocessor 100 based on space limitation proposed by the present invention have been described in detail with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present invention, various modifications and variations can be made to the above specific embodiments, and various combinations can be made to the various technical features and structures proposed by the present invention, without exceeding the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A space-constrained counter-rotating pulp preprocessor, characterized in that, Including: A sizing barrel (110) having an accommodation cavity (111) inside, and a slurry inlet (112) and a slurry outlet (113) communicating with the accommodation cavity (111) are provided on the outer wall of the sizing barrel (110); wherein, a chemical addition pipe (114) communicating with the accommodation cavity (111) is further provided on the sizing barrel (110); the slurry inlet (112) is provided at the lower end of the sizing barrel (110), and the arrangement direction of the slurry inlet (112) is tangent to the circumferential direction (Y) of the barrel wall of the sizing barrel (110). A stirring assembly (120) including a stirring shaft (121) and at least two stirring impellers (122) provided on the stirring shaft (121), and at least two of the stirring impellers (122) are arranged facing each other. A driving assembly (130) is installed on the sizing barrel (110) and connected to the stirring shaft (121), configured to drive the stirring shaft (121) to rotate so that at least two stirring impellers (122) generate opposite radial flows and the same circumferential flow. A stirring mesh cover (140) is sleeved outside the stirring assembly (120), the upper end is detachably connected to the sizing barrel (110), the lower end is open and communicates with the accommodation cavity (111), and diversion holes (141) are provided on the peripheral wall of the stirring mesh cover (140); the included angle between the opening direction of the diversion holes (141) and the instantaneous rotation tangential direction of the stirring impeller (122) at the diversion holes (141) during rotation is 0° to 90°.

2. The counter-rotating pulp preprocessor based on space limitation according to claim 1, wherein The diversion holes (141) include a plurality of them, and are arranged in an array along the circumferential direction (Y) and the axial direction (X) of the stirring mesh cover (140).

3. The counter-rotating pulp preprocessor based on space limitation according to claim 1, wherein It further includes: a baffle (150) The baffle (150) is fixedly provided on the inner wall of the sizing barrel (110), and at least covers the diversion holes (141) provided on the stirring mesh cover (140), so that the direction of the pulp ejected through the diversion holes (141) is changed under the action of the baffle (150).

4. The counter-rotating pulp preprocessor based on space limitation according to claim 1, wherein The chemical addition pipe (114) is provided inside the stirring mesh cover (140), and the end of the chemical addition pipe (114) is located at the middle position between two adjacent stirring impellers (122).

5. The counter-rotating pulp preprocessor based on space limitation according to claim 1, wherein The slurry outlet (113) includes two, one of which is provided near the upper end of the sizing barrel (110), and the other is provided near the lower end of the sizing barrel (110).

6. The counter-rotating pulp preprocessor based on space limitation according to claim 1, wherein The upper end of the stirring mesh cover (140) and the sizing barrel (110) are connected by a threaded connection or a snap connection.

7. The space-constrained counter-rotating pulp preprocessor according to claim 6, wherein a bracket (142) is provided at the lower end of the stirring screen cover (140), and the bracket (142) is fixedly connected to the pulp mixing tank (110).

8. The space-constrained counter-rotating pulp preprocessor according to claim 1, wherein the structure of the diversion hole (141) is one of an arc shape, a tooth shape, and a shape without a diversion wall.

Images