A composite ore powder high-efficiency mixing device based on multi-stage turbulent homogenization

Abstract

The utility model relates to mineral processing equipment technical field more specifically, relate to a kind of composite ore powder high-efficiency mixing device based on multistage turbulent homogenization.The utility model is installed rotating disc, airflow nozzle and ultrasonic vibration plate by subarea, make composite ore powder under the triple action of centrifugal, pneumatic and vibration, substantially improve mixing uniformity;While vertical cylindrical structure is used to reduce floor area, and in the drying of airflow nozzle during mixing process is carried out dry, carry out drying and mixing uniformly, substantially reduce energy consumption, solve the problem of poor compatibility of multi-component ore powder.

Description

Technical Field

[0001] This utility model relates to the field of mineral processing equipment technology, and more specifically, to a high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization. Background Technology

[0002] Composite mineral powder mixing equipment is a key piece of equipment in building materials (such as cement and concrete admixtures), metallurgy, chemical industry, and environmental protection (solid waste utilization). Its goal is to uniformly mix different types, particle sizes, and densities of mineral powders (such as slag powder, fly ash, steel slag powder, limestone powder, and silica fume) to meet the performance requirements of specific products. Current mainstream mixing equipment (such as twin-shaft paddle mixers and V-type mixers) still faces significant technical bottlenecks when handling multi-component mineral powder mixing: mixing dead zones, insufficient mixing uniformity, easy agglomeration, and high energy consumption. Traditional equipment relies on mechanical stirring, a significant drawback of which is uneven shear force distribution, easily forming flow dead zones, leading to powder accumulation in these areas. Furthermore, the drying and mixing processes are separated, resulting in a lengthy overall process and a lack of anti-agglomeration effects. When dealing with multi-component mineral powders with large density differences and wide particle size distributions, stratification and sedimentation can easily lead to component deviation.

[0003] Therefore, there is an urgent need for a composite mineral powder mixing device with a compact structure, high mixing uniformity, low energy consumption, and drying and anti-agglomeration functions to solve the problem of poor compatibility of multi-component mineral powders. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization. It significantly improves the mixing uniformity of composite mineral powder through the regional installation of rotating discs, airflow nozzles, and ultrasonic vibrating plates, allowing the powder to be mixed uniformly under the triple action of centrifugation, pneumatics, and vibration. Simultaneously, the vertical cylindrical structure reduces the floor space required, and the hot air ejected from the airflow nozzles is used for drying during the mixing process, unifying drying and mixing, thus significantly reducing energy consumption and solving the problem of poor compatibility among multi-component mineral powders.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization includes a drive unit, a screw feeder, a cylinder, and a support. The drive unit is installed on the outer wall of the cylinder. The cylinder has a feed inlet at its top and a discharge outlet at its bottom. The drive unit drives an inner shaft to rotate. The inner shaft extends into the cylinder through the feed inlet and extends out of the cylinder through the discharge outlet. The outer wall of the inner shaft is fitted onto the inner wall of an outer shaft, and the outer shaft is rotatably connected to the inner shaft. The support elevates the cylinder to create a discharge gap below the discharge outlet. An airflow nozzle and an ultrasonic transducer are installed inside the cylinder.

[0007] The screw feeder is installed at the feed inlet to achieve feeding. One end of the outer shaft is located below the screw feeder, and the other end of the outer shaft is connected to a second motor. The second motor is fixedly installed at the bottom of the bracket and drives the outer shaft to rotate. Two rotating disks are axially fixedly installed on the outer wall of the outer shaft in sequence. The rotating disks rotate synchronously with the outer shaft. The two rotating disks divide the inner cavity of the cylinder into three regions in sequence. The three regions, from top to bottom, are the first centrifugal dispersion layer, the second centrifugal dispersion layer where the airflow nozzle is installed, and the turbulence layer where the ultrasonic transducer is installed.

[0008] Furthermore, the rotational speed of the rotating disk is adjustable in the range of 200-600 rpm.

[0009] Furthermore, the rotating disk rotates at a speed of 400 rpm.

[0010] Furthermore, the screw feeder includes screw blades and a tube wall. The screw blades are fixedly connected to the inner shaft, and a feeding space is formed between the screw blades and the tube wall. The feeding space is connected to the outside of the cylinder and the first centrifugal dispersion layer.

[0011] Furthermore, a conical guide cylinder is installed in the second centrifugal dispersion layer region. The conical guide cylinder tapers in the middle so that it forms an upper conical surface with a diameter tapering from top to bottom and a lower conical surface with a diameter tapering from bottom to top.

[0012] Furthermore, the lower conical surface of the conical guide cylinder is circumferentially distributed with airflow nozzles, and the airflow nozzles are connected to a hot air generator to eject pulsed airflow.

[0013] Furthermore, the airflow nozzles alternately open and close at a frequency of 0.5-2Hz, and the hot air generator introduces hot air at 60-80℃.

[0014] Furthermore, the hot air generator is supplied with hot air at 70°C.

[0015] Furthermore, the diameter of the conical guide tube at its midpoint is smaller than the outer diameter of the rotating disk.

[0016] Furthermore, the diameter of the turbulent layer gradually decreases from top to bottom and converges at the discharge port; an ultrasonic transducer is installed on the inner wall of the cylinder located in the turbulent layer, and the ultrasonic transducer matches the shape of the turbulent layer to form a conical surface.

[0017] Furthermore, the ultrasonic transducer operates at a frequency of 20-40kHz and has a cycle of 2 minutes of operation followed by a 10-second interval.

[0018] Furthermore, a screen is installed on the discharge port, and the mineral powder is buffered by the screen and discharged under the control of a pneumatic butterfly valve.

[0019] Furthermore, in the three regions, the volumes of the turbulent layer, the second centrifugal dispersion layer, and the first centrifugal dispersion layer decrease sequentially.

[0020] Furthermore, the working surface of the rotating disk is equipped with spiral guide vanes for adjusting the centrifugal dispersion trajectory of the mineral powder.

[0021] Furthermore, the axis of the feed inlet and the tangential surface of the cylinder form an angle that tilts the feed direction toward the inside of the cylinder.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention significantly improves the mixing uniformity of composite mineral powder by installing a rotating disk, airflow nozzles, and ultrasonic vibrating plates in separate zones, allowing the powder to be mixed under the triple action of centrifugation, pneumatics, and vibration. Simultaneously, the vertical cylindrical structure reduces floor space requirements, and the use of hot air from the airflow nozzles for drying during mixing significantly reduces energy consumption. Furthermore, by combining the airflow nozzles with the ultrasonic vibrating plates, drying and ultrasonic anti-agglomeration are carried out in tandem, solving the problem of mineral powder absorbing moisture and agglomerating. In addition, the parameters of the rotating disk, airflow nozzles, and ultrasonic vibrating plates provided in this invention are flexibly adjustable. By adjusting the rotation speed of the rotating disk, the temperature of the airflow nozzles, and the frequency of the ultrasonic vibrating plates, it can adapt to the mixing of mineral powders with different ratios. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the spiral guide vane and rotating disk of this utility model;

[0026] Figure 3 This is a schematic diagram of the mineral powder mixing path of this utility model (the arrow indicates the direction of mineral powder flow).

[0027] In the diagram: 1. Drive unit; 2. Screw feeder; 3. Cylinder; 31. Feed inlet; 32. Ultrasonic vibrating plate; 33. Screen; 41. Inner shaft; 42. Outer shaft; 43. Motor II; 5. Conical guide cylinder; 6. Airflow nozzle; 7. Support; 8. Rotary disk; 9. Spiral guide vane. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Example 1:

[0031] Please see Figure 1-3 A high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization is provided by this utility model. The high-efficiency mixing device for composite mineral powder is a vertical cylindrical structure that reduces the floor space. It includes a drive device 1, a screw feeder 2, a cylinder 3 and a support 7. The drive device 1 is installed on the outer wall of the cylinder 3. The top of the cylinder 3 has a feed port 31 and the bottom of the cylinder 3 has a discharge port. The drive device 1 drives the inner shaft 41 to rotate. The inner shaft 41 extends into the cylinder 3 through the feed port 31 and extends out of the cylinder 3 through the discharge port. The outer wall of the inner shaft 41 is sleeved with the outer shaft 42. The inner wall of the outer shaft 42 is rotatably connected to the outer wall of the inner shaft 41.

[0032] Specifically, the drive device 1 includes a belt and a motor 1. The power is transmitted from the motor 1 to the inner shaft 41 through the belt, that is, the motor 1 drives the inner shaft 41 to rotate.

[0033] The bracket 7 is detachably fixed to the outer wall of the cylinder 3 to raise the cylinder 3, so that a discharge gap is left below the discharge port. One end of the outer shaft 42 is located below the screw feeder 2, and the other end of the outer shaft 42 is connected to the second motor 43. The second motor 43 is fixedly installed at the bottom of the bracket 7, and the second motor 43 drives the outer shaft 42 to rotate.

[0034] The screw feeder 2 is installed at the feed inlet 31. The screw feeder 2 includes screw blades and a tube wall (not shown in the figure). The screw blades are fixedly connected to the outer wall of the inner shaft 41. A feeding space is formed between the screw blades and the tube wall. The feeding space connects the inside and outside of the cylinder 3. When the inner shaft 41 rotates, the mineral powder is transported in a uniform linear motion within the feeding space.

[0035] The axis of the feed inlet 31 forms a 45° angle with the cross-section of the cylinder 3, so that the feed direction is inclined towards the inside of the cylinder 3. The inclination angle design makes it easier for the mineral powder to be introduced along the spiral motion direction of the screw feeder 2, and reduces dust flying and mineral powder accumulation on the wall.

[0036] Furthermore, the top of the outer shaft 42 is connected to the inner shaft 41 via a covered bearing to prevent the material from the feed inlet 31 from entering the gap between the outer shaft 42 and the inner shaft 41.

[0037] Two rotating disks 8 are sequentially installed below the screw feeder 2. The two rotating disks 8 are axially distributed along the outer shaft 42 and are detachably installed on the outer wall of the outer shaft 42. The rotating disks 8 rotate synchronously with the outer shaft 42. The two rotating disks 8 divide the inner cavity of the cylinder 3 into a first centrifugal dispersion layer, a second centrifugal dispersion layer, and a turbulent flow layer from top to bottom. The rotation speed of the rotating disks 8 is adjustable from 200 to 600 rpm. Several spiral guide vanes 9 are fixedly installed on each rotating disk 8.

[0038] Mineral powder is fed into cylinder 3 through screw feeder 2. The mineral powder fed into cylinder 3 first passes through the first rotating disk 8, and the mineral powder is dispersed into a thin layer by centrifugal force, so that the mineral powder is scattered in the first centrifugal dispersion layer to form an umbrella-shaped material curtain.

[0039] A conical guide cylinder 5 is fixedly installed on the inner wall of the cylinder 3. The conical guide cylinder 5 is located in the second centrifugal dispersion layer area. The middle part of the conical guide cylinder 5 converges towards the axis, thereby dividing the conical guide cylinder 5 into an upper conical surface with a diameter converging from top to bottom and a lower conical surface with a diameter converging from bottom to top. The mineral powder falls and gathers along the upper conical surface of the conical guide cylinder 5.

[0040] The lower conical surface of the conical guide cylinder 5 is uniformly distributed with pulsed airflow nozzles 6. The airflow nozzles 6 are connected to the hot air generator. The airflow nozzles 6 spray pulsed airflow to cause gas-solid transient disturbance to the falling mineral powder, penetrate the mineral powder curtain and cause the powder particles to tumble violently. The airflow nozzles 6 open and close alternately at a frequency of 0.5-2Hz, and the hot air generator introduces hot air at 60-80℃.

[0041] The mineral powder curtain, which is sprayed in the first centrifugal dispersion layer, falls from the side of the first rotating disk 8 to the second centrifugal dispersion layer area. After being guided by the upper cone surface of the conical guide cylinder 5, it falls onto the surface of the second rotating disk 8. Under the action of centrifugal force when the second rotating disk 8 rotates, a thin layer of dispersion curtain is formed again. At the same time, the airflow nozzle 6 sprays hot airflow into the curtain, achieving the dual effect of mixing and drying through gas-solid disturbance.

[0042] The thin-layered dispersion curtain formed in the second centrifugal dispersion layer region merges with the mineral powder curtain thrown in the first centrifugal dispersion layer, and is guided by the upper cone surface of the conical guide cylinder 5, and the merging step is repeated continuously; when the curtain accumulates to the critical thickness, its edge part detaches from the second rotating disk 8 circumferentially and falls into the turbulent layer region below the second rotating disk 8.

[0043] The conical guide cylinder 5 converges towards the axis in the middle, and the diameter of the converged part is smaller than the outer diameter of the rotating disk 8, so that the mineral powder reciprocates between the centrifugal force of the rotating disk 8 and the airflow power of the airflow nozzle 6, thereby achieving the mixing and drying of the mineral powder in a suspended state.

[0044] The diameter of the turbulent layer in the cylinder 3 gradually decreases from top to bottom, eventually converging at the discharge port at the bottom. An ultrasonic transducer 32 is installed on the inner wall of the cylinder 3, located within the turbulent layer. The ultrasonic transducer 32 matches the shape of the cylinder 3 to form a conical surface. The ultrasonic transducer 32 operates at a frequency of 20-40kHz, with a working cycle of 2 minutes of operation followed by a 10-second interval, intermittently emitting high-frequency vibration waves to disperse agglomerated particles.

[0045] A screen 33 can be detachably installed on the discharge port. The mixed composite mineral powder is buffered by the screen 33 and discharged under the control of a pneumatic butterfly valve.

[0046] The three regions inside the cylinder 3, with volumes increasing from small to large, are the first centrifugal dispersion layer, the second centrifugal dispersion layer, and the turbulent layer, so that the mineral powder maintains a flowing state during the stepwise migration process, thereby achieving thorough mixing.

[0047] Each rotating disk 8 has a spiral guide vane installed on its working surface to adjust the movement trajectory of the mineral powder during centrifugal dispersion and to extend the dwell time.

[0048] This invention significantly improves the mixing uniformity of composite mineral powder by installing a rotating disk 8, airflow nozzles 6, and ultrasonic vibrating plate 32 in different areas, under the triple action of centrifugation, pneumatics, and vibration. Simultaneously, the vertical cylindrical structure reduces floor space requirements, and the hot air ejected from the airflow nozzles 6 during the mixing process significantly reduces energy consumption. Furthermore, by combining the airflow nozzles 6 with the ultrasonic vibrating plate 32, this invention allows drying and ultrasonic anti-agglomeration to work in tandem, thus solving the problem of moisture absorption and agglomeration of mineral powder.

[0049] Example 2:

[0050] Please see Figure 1-3 According to Example 1, the specific operation method of the composite mineral powder high-efficiency mixing device based on multi-stage turbulent homogenization during the actual mixing process includes:

[0051] S1. Feeding: After being metered, slag powder and fly ash are fed into the feed inlet. The fed slag powder enters the cylinder along the screw feeder.

[0052] S2, Primary Dispersion: Both rotating disks rotate at 400 rpm, and the mineral powder is dispersed into a thin layer by centrifugal force.

[0053] S3, Gas-Solid Turbulence: The airflow nozzle outputs a 70°C pulsed airflow that penetrates the mineral powder curtain dispersed into a thin layer by centrifugal force, causing the powder particles to tumble violently, thereby achieving uniform drying and mixing.

[0054] S4. Anti-agglomeration treatment: The ultrasonic transducer emits a high-frequency vibration wave every 2 minutes to break up newly formed agglomerates.

[0055] S5. Discharge: The mixed composite mineral powder is buffered by a pressure equalization screen and discharged by a pneumatic butterfly valve to ensure consistent discharge density.

[0056] The device provided by this invention is used for mixing composite mineral powders. Due to the triple action of centrifugation, pneumatics, and vibration, the mixing uniformity is greatly improved, and the mixing variation coefficient is ≤5% (compared to about 15% for traditional equipment). The vertical structure reduces power requirements, and hot air is directly used for drying during the mixing process, reducing energy consumption by 30%. Simultaneous drying and ultrasonic anti-agglomeration solve the problem of mineral powder moisture absorption and agglomeration. The rotation speed, airflow temperature, and frequency parameters can be flexibly adjusted to adapt to different mineral powder ratios.

Claims

1. A high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization, characterized in that: The device includes a drive unit (1), a screw feeder (2), a cylinder (3), and a support (7). The drive unit (1) is installed on the outer wall of the cylinder (3). The top of the cylinder (3) has a feed port (31), and the bottom of the cylinder (3) has a discharge port. The drive unit (1) drives the inner shaft (41) to rotate. The inner shaft (41) extends into the cylinder (3) through the feed port (31) and extends out of the cylinder (3) through the discharge port. The outer wall of the inner shaft (41) is sleeved with the inner wall of the outer shaft (42), and the outer shaft (42) is rotatably connected to the inner shaft (41). The support (7) raises the cylinder (3) to leave a discharge gap below the discharge port. An airflow nozzle (6) and an ultrasonic transducer (32) are installed in the inner cavity of the cylinder (3). The screw feeder (2) is installed at the feed inlet (31) to realize feeding. One end of the outer shaft (42) is located below the screw feeder (2), and the other end of the outer shaft (42) is connected to the second motor (43). The second motor (43) is fixedly installed at the bottom of the bracket (7). The second motor (43) drives the outer shaft (42) to rotate. Two rotating disks (8) are axially fixedly installed on the outer wall of the outer shaft (42). The rotating disks (8) rotate synchronously with the outer shaft (42). The two rotating disks (8) divide the inner cavity of the cylinder (3) into three regions in sequence. The three regions, from top to bottom, are the first centrifugal dispersion layer, the second centrifugal dispersion layer with the airflow nozzle (6) installed, and the turbulent layer with the ultrasonic vibrating plate (32) installed.

2. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: The spiral feeder (2) includes spiral blades and a tube wall. The spiral blades are fixedly connected to the inner shaft (41). A feeding space is formed between the spiral blades and the tube wall. The feeding space is connected to the outside of the cylinder (3) and the first centrifugal dispersion layer.

3. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: A conical guide cylinder (5) is installed in the second centrifugal dispersion layer region. The conical guide cylinder (5) is constricted in the middle so that the conical guide cylinder (5) forms an upper conical surface with a diameter constricted from top to bottom and a lower conical surface with a diameter constricted from bottom to top.

4. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 3, characterized in that: The lower conical surface of the conical guide cylinder (5) is uniformly distributed with airflow nozzles (6), and the airflow nozzles (6) are connected to the hot air generator to spray pulsed airflow.

5. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 3, characterized in that: The diameter of the conical guide tube (5) at the middle constriction is smaller than the outer diameter of the rotating disk (8).

6. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: The diameter of the turbulent layer gradually decreases from top to bottom and converges at the discharge port; the cylinder (3) has an ultrasonic transducer (32) installed on the inner wall of the turbulent layer, and the ultrasonic transducer (32) matches the shape of the turbulent layer to form a conical surface.

7. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 6, characterized in that: A screen (33) is installed on the discharge port.

8. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: In the three regions, the volumes of the turbulent layer, the second centrifugal dispersion layer, and the first centrifugal dispersion layer decrease sequentially.

9. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: The working surface of the rotating disk (8) is equipped with spiral guide vanes for adjusting the centrifugal dispersion trajectory of mineral powder.

10. The high-efficiency mixing device for composite mineral powder based on multi-stage turbulent homogenization according to claim 1, characterized in that: The axis of the feed inlet (31) and the tangent of the cylinder (3) form an angle that tilts the feed direction toward the inside of the cylinder (3).

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