A dense medium cyclone mixer

Abstract

The utility model belongs to the technical field of gravity coal and ore dressing, especially relates to a heavy medium cyclone mixer, including material receiving device section, the rotator section, the feeding cylinder section, the mixing cylinder section, the lower extreme of material receiving device section is connected together through the flange and the annular shape bottom plate of feeding cylinder section, the lower extreme of feeding cylinder section and the upper extreme of mixing cylinder section are connected together through the flange, and the rotator section upper extreme is fixed on the annular shape bottom plate, the feeding cylinder section upper portion side is equipped with the feeding port, and the mixing cylinder section side is equipped with pressure monitoring device and density monitoring device respectively, the outlet diameter of the mixing cylinder section is greater than the rotator section inner diameter, the heavy medium cyclone mixer of the utility model is applicable to the adjustment of two section separation density of three product heavy medium cyclone, and the adjustment of the proportion and flow velocity of mixing can make the separation density and working pressure of two section cyclone be flexibly regulated, fundamentally solve the technical problem of the on-line regulation of two section separation density and working pressure of three product heavy medium cyclone.

Description

Technical Field

[0001] This utility model belongs to the field of gravity coal preparation and mineral processing technology, and in particular relates to a heavy medium cyclone mixer. Background Technology

[0002] Heavy medium cyclones are simple-structured, non-moving separation devices that feature simple processes and high separation efficiency, and are widely used in coal washing and processing. Commonly used types include two-product heavy medium cyclones and three-product heavy medium cyclones. A three-product heavy medium cyclone consists of a cylindrical cyclone and two conical cyclones connected in series by a connecting pipe. Because the three-product heavy medium hydrocyclone uses a single low-density heavy medium suspension during operation, the light product (clean coal) and heavy product (mixture of middlings and gangue) are first separated in the first-stage hydrocyclone. The clean coal is discharged from the clean coal outlet of the first-stage hydrocyclone along with the heavy medium suspension, while the heavy product and heavy medium suspension are discharged from the underflow outlet of the first-stage hydrocyclone and conducted to the second-stage hydrocyclone through the connecting pipe between the first and second stages. In the second-stage hydrocyclone, the middlings and gangue are then separated. The shortcoming of the existing three-product heavy medium hydrocyclone technology is that the re-separation density of the second-stage hydrocyclone is limited by that of the first-stage hydrocyclone. When the quality of the raw coal entering the washing process changes, the separation density of the second-stage hydrocyclone cannot be adjusted autonomously, resulting in a serious over-standard (GB / T35054-2018 standard, middlings carrying clean coal ≤5%, gangue carrying coal ≤1.0%), causing serious resource losses. The existing technology for adjusting the density of the second-stage sorting is to adjust the structural parameters of the second-stage hydrocyclone. One method is to extend or shorten the insertion length of the central tube of the second-stage coal, and the other is to replace the underflow port and increase or decrease its diameter. However, since these two methods are not effective enough to meet production requirements, only by increasing the flow rate can production be maintained.

[0003] To solve this technical challenge, scientists have made unremitting efforts. Patent application CN202010913085.8 discloses a three-product heavy medium cyclone with online adjustable two-stage separation density. The technical solution involves adding water and heavy medium to the existing heavy medium system. However, this increases the burden on coal washing water treatment and raises coal preparation costs. With increasing uncertainties in mining geology, high gangue content in raw coal is a common trend in my country's current and future coal mining, posing a severe challenge to raw coal washing and processing. Therefore, finding a device that can adapt and adjust the functions (separation density and working pressure) of the two-stage cyclone according to changes in the properties of the raw coal to replace the existing one-stage and two-stage cyclone connecting pipes has become an urgent technical problem to be solved. Summary of the Invention

[0004] The problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a heavy medium cyclone mixer.

[0005] This invention is achieved through the following technical solution: A heavy medium cyclone mixer includes a receiving section, a cyclone initiator section, a feed cylinder section, and a mixing cylinder section. The feed cylinder section has an annular base plate at its upper end and a flange at its lower end. The lower end of the receiving section is sealed to the upper surface of the annular base plate via the flange. The lower end of the feed cylinder section and the upper end of the mixing cylinder section are sealed together via the flange. The upper end of the cyclone initiator section is fixed to the lower surface of the annular base plate. Both the feed cylinder section and the cyclone initiator section are cylindrical, with the cyclone initiator section located inside the feed cylinder section. The cyclone initiator section and the feed cylinder section are... The components are arranged coaxially, with the inner diameters of the vortex initiator section, the annular base plate, and the lower end of the receiving section all being equal. The upper side of the feed cylinder section has a feed inlet, allowing the heavy medium suspension to enter tangentially from the inlet. The sides of the mixing cylinder section are equipped with pressure monitoring devices and density monitoring devices. The pressure monitoring device monitors the pressure of the heavy medium mixture within the mixing cylinder section, and the density monitoring device monitors the density of the heavy medium mixture within the mixing cylinder section. The inner diameter of the discharge port of the mixing cylinder section is larger than the inner diameter of the vortex initiator section.

[0006] Preferably, the wear-resistant lining layer of the inner wall of the receiving section, the swirl generator section, the feed cylinder section and the mixing cylinder section is a wear-resistant high-alumina ceramic layer, a wear-resistant silicon carbide ceramic layer or a wear-resistant composite metal layer.

[0007] Preferably, the pressure monitoring device is installed on a flange, a pressure guide pipe is fixed on the flange, a pressure tap is provided on the mixing cylinder section, the pressure guide pipe is connected to the pressure tap, and the pressure monitoring probe inside the pressure guide pipe is located at the pressure tap.

[0008] Preferably, the density monitoring device is mounted on a flange, a connecting pipe is fixed on the flange, an opening is provided on the mixing cylinder section, the connecting pipe is connected to the opening, and the density monitoring probe inside the connecting pipe is located at the opening.

[0009] Preferably, the receiving section is a concentric pipe of the same diameter or a concentric pipe of different diameters.

[0010] Preferably, the mixing section is a concentric pipe of the same diameter or a concentric pipe of different diameters.

[0011] The heavy medium cyclone mixer of this invention is applicable to the adjustment of the separation density in the second stage of a three-product heavy medium cyclone. By using the heavy medium cyclone mixer of this invention to replace the connecting pipe between the first and second stage cyclones in the prior art, the first and second stage cyclones of a three-product heavy medium cyclone can be connected. This allows the feed of the second stage cyclone to be changed from the single-density slurry feed of the prior art to a mixed feed of multi-phase density slurry. In this way, the second stage cyclone can obtain the mixed slurry required for high-density separation. By adjusting the mixing ratio and flow rate of slurries of different density levels, the separation density and working pressure of the second stage cyclone can be flexibly controlled online. This fundamentally solves the technical problem that the separation density and working pressure of the second stage of a three-product heavy medium cyclone are difficult to adjust and control online.

[0012] The mixer of this invention can fully and uniformly mix slurries of different densities to form a new density-level mixed slurry fluid, which is suitable for high-density and precise separation of heavy products in heavy medium cyclones and improves concentrate recovery rate.

[0013] The mixer of this invention causes the heavy medium suspension fed into the feed cylinder to rotate at high speed, and the resulting high-speed rotating flow prevents the mixed slurry from getting stuck during the flow process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure in this embodiment; Figure 2 This is a schematic diagram of the feeding method at the feed inlet in this embodiment; Figure 3 This is a schematic diagram of the structure of the three-product heavy medium cyclone in this embodiment.

[0015] In the diagram, 1 is the receiving section, 2 is the cyclone generator section, 3 is the feed cylinder section, 4 is the feed inlet, 5 is the mixing cylinder section, 6 is the pressure monitoring device, 7 is the density monitoring device, 8 is the first-stage hydrocyclone, 9 is the annular bottom plate, 10 is the second-stage hydrocyclone, 11 is the discharge port, and 12 is the pressure guide pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0017] The heavy medium cyclone mixer of this embodiment includes a receiving section 1, a swirl initiator section 2, a feed cylinder section 3, and a mixing cylinder section 5. The feed cylinder section 3 is cylindrical, with an annular base plate 9 at its upper end. The lower end of the receiving section 1 is sealed and fixedly connected to the upper surface of the annular base plate 9 via a flange, and the inner diameter of the lower end of the receiving section 1 is equal to the inner diameter of the annular base plate 9. A flange is located at the lower end of the feed cylinder section 3, and a corresponding flange is located at the upper end of the mixing cylinder section 5. The lower ends of the feed cylinder section 3 and the upper ends of the mixing cylinder section 5 are sealed and fixedly connected together via flanges. The swirl initiator section 2 is also cylindrical, located inside the feed cylinder section 3, at the same height as the feed cylinder section 3, and arranged concentrically and coaxially with the feed cylinder section 3. The upper end of the swirl initiator section 2 is fixed to the lower surface of the annular base plate 9, and the inner diameter of the swirl initiator section 2 is also equal to the inner diameter of the annular base plate 9. The receiving section 1 and the mixing cylinder section 5 can be made of concentric pipes of the same diameter, i.e., cylindrical pipes, or concentric pipes of different diameters, i.e., pipes with gradually changing diameters, or conical pipes. In this embodiment, both the receiving section 1 and the mixing cylinder section 5 are made of concentric pipes of different diameters, i.e., conical pipes, as shown in the attached figure of this embodiment. Figure 1 As shown. Preferably, the wear-resistant lining layer of the inner wall of the receiving section 1, the swirl generator section 2, the feed cylinder section 3, and the mixing cylinder section 5 can be selected as a wear-resistant high-alumina ceramic layer, a wear-resistant silicon carbide ceramic layer, or a wear-resistant composite metal layer.

[0018] A feed inlet 4 is provided on the upper side of the feed cylinder section 3. The heavy medium suspension is pumped from the feed inlet 4. The design of the feed inlet 4 is the same as the feeding method of a conventional hydrocyclone, as shown in the attached figure. Figure 2 As shown, the heavy medium suspension enters the feed cylinder section 3 tangentially from the feed inlet 4 at a certain pressure, forming a spiral flow field. An important design feature of this invention is that the inner diameter of the outlet 11 at the lower end of the mixing cylinder section 5 is larger than the inner diameter of the vortex initiator section 2. This prevents the generation of centripetal suction (negative pressure) within the vortex initiator section 2, meaning the fluid does not flow towards the receiving section 1. The heavy medium suspension entering from the feed cylinder section 3 spirals downwards into the mixing cylinder section 5, and the fluid entering from the receiving section 1 also flows into the mixing cylinder section 5. Because the heavy medium suspension rotates during the mixing process, the two can be fully and uniformly mixed within the mixing cylinder section 5, forming a new density level of heavy medium mixture. This not only prevents clogging but also allows for the acquisition of heavy medium mixtures of different density levels by adjusting the mixing ratio.

[0019] Pressure monitoring device 6 and density monitoring device 7 are respectively installed on the side of mixing section 5. Pressure monitoring device 6 is used to monitor the pressure of heavy medium mixed fluid in mixing section 5, and density monitoring device 7 is used to monitor the density of heavy medium mixed fluid in mixing section 5. Pressure monitoring device 6 and density monitoring device 7 are conventional devices on hydrocyclones, and their installation methods are well known to technicians. Here, only a brief description of the installation structure is given. The pressure monitoring device 6 is installed on a flange, and a pressure guiding pipe 12 is fixed on the flange. A pressure tap is provided on mixing section 5 in conjunction with the pressure guiding pipe 12. The pressure guiding pipe 12 is connected to the pressure tap, and the connection between the pressure guiding pipe 12 and the pressure tap is sealed. The pressure monitoring probe of pressure monitoring device 6 is located inside the pressure guiding pipe 12 and at the pressure tap, and is used to measure the pressure of the fluid in mixing section 5. The density monitoring device 7 is mounted on a flange, and a connecting pipe is fixed on the flange. The mixing cylinder section 5 has an opening corresponding to the connecting pipe, and the connecting pipe is connected to the opening. The connecting pipe is not shown in the attached figure. The connection between the connecting pipe and the opening is sealed. The density monitoring probe of the density monitoring device 7 is located inside the connecting pipe and at the opening, and is used to measure the density of the fluid in the mixing cylinder section 5.

[0020] The heavy medium cyclone mixer provided by this invention is particularly suitable for adjusting the online separation density and working pressure of the second-stage cyclone 10 in a three-product heavy medium cyclone mixer. Its specific implementation method is as follows: (see attached diagram) Figure 3 As shown, the three-product heavy medium hydrocyclone includes a first-stage hydrocyclone 8 and a second-stage hydrocyclone 10. The receiving section 1 of this invention is fixedly connected to the underflow flange of the first-stage hydrocyclone 8 via a flange seal. The discharge port 11 of the mixing cylinder section 5 is fixedly connected to the feed port flange of the second-stage hydrocyclone 10 via a flange seal, thus forming a complete three-product heavy medium hydrocyclone. The medium-density slurry (a mixture of middlings, gangue, and heavy medium suspension, indicated by A in the attached figure) discharged from the underflow port of the first-stage hydrocyclone 8 is received by the receiving section 1, passes through the inner cavity of the vortex generator section 2, and enters the mixing cylinder section 5. The high-density heavy medium suspension (indicated by B in the attached figure) is fed into the feeding cylinder section 3 via the feed port 4 of the feeding cylinder section 3 by a pump-pressure conveying system, forming a high-speed rotating fluid that enters the mixing cylinder section 5. The medium-density slurry and the high-density heavy medium suspension are fully mixed under the action of the rotating flow. A new density-grade heavy medium mixture (represented by C in the attached diagram) is formed. The heavy medium mixture enters the second-stage hydrocyclone 10 through the feed port. When the raw coal has a high gangue content and high-density separation is required by the second-stage hydrocyclone 10, adjusting the mixing ratio and flow rate of the high-density heavy medium suspension can flexibly control the separation density and working pressure of the second-stage hydrocyclone 10, fundamentally solving the technical problem of online control of the separation density and working pressure of the two-stage heavy medium hydrocyclone for three products.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A heavy medium cyclone mixer, characterized in that: The system includes a receiving section (1), a swirl starter section (2), a feeding cylinder section (3), and a mixing cylinder section (5). The feeding cylinder section (3) has an annular base plate (9) at its upper end and a flange at its lower end. The lower end of the receiving section (1) is sealed to the upper surface of the annular base plate (9) through the flange. The lower end of the feeding cylinder section (3) and the upper end of the mixing cylinder section (5) are sealed to each other through the flange. The upper end of the swirl starter section (2) is fixed to the lower surface of the annular base plate (9). Both the feeding cylinder section (3) and the swirl starter section (2) are cylindrical. The swirl starter section (2) is located inside the feeding cylinder section (3). The swirl starter section (2) and the feeding cylinder section (3) are concentric and coaxial. The inner diameters of the vortex initiator section (2), the annular base plate (9), and the lower end of the receiving section (1) are all equal. The upper side of the feed cylinder section (3) is provided with a feed inlet (4), through which the heavy medium suspension can enter the feed cylinder section (3) tangentially. The sides of the mixing cylinder section (5) are respectively provided with a pressure monitoring device (6) and a density monitoring device (7). The pressure monitoring device (6) is used to monitor the pressure of the heavy medium mixture in the mixing cylinder section (5), and the density monitoring device (7) is used to monitor the density of the heavy medium mixture in the mixing cylinder section (5). The inner diameter of the outlet (11) of the mixing cylinder section (5) is larger than that of the vortex initiator section (2).

2. The heavy medium cyclone mixer according to claim 1, characterized in that: The wear-resistant lining layer of the inner wall of the receiving section (1), the swirl generator section (2), the feed cylinder section (3) and the mixing cylinder section (5) is a wear-resistant high-alumina ceramic layer, a wear-resistant silicon carbide ceramic layer or a wear-resistant composite metal layer.

3. The heavy medium cyclone mixer according to claim 1, characterized in that: The pressure monitoring device (6) is installed on the flange, and the pressure guide pipe (12) is fixed on the flange. The mixing cylinder section is provided with a pressure tap, and the pressure guide pipe (12) is connected to the pressure tap. The pressure monitoring probe inside the pressure guide pipe (12) is located at the pressure tap.

4. The heavy medium cyclone mixer according to claim 1, characterized in that: The density monitoring device (7) is installed on a flange, a connecting pipe is fixed on the flange, an opening is provided on the mixing cylinder section, the connecting pipe is connected to the opening, and the density monitoring probe inside the connecting pipe is located at the opening.

5. The heavy medium cyclone mixer according to claim 1, characterized in that: The receiving section (1) is a concentric pipe of the same diameter or a concentric pipe of different diameters.

6. The heavy medium cyclone mixer according to claim 1, characterized in that: The mixing section (5) is a concentric pipe of the same diameter or a concentric pipe of different diameters.

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