Silicon carbide airflow grinding system

Abstract

The utility model discloses a silicon carbide jet milling system, which comprises a jaw crusher and a jet mill, the discharge end of the jaw crusher is provided with a Pasmak double crusher, the discharge end of the Pasmak double crusher is provided with an ultrasonic screening machine, the fine material output end of the ultrasonic screening machine is conveyed to an impurity removal and separation system, and the fine material output end of the ultrasonic screening machine is conveyed to the jet mill. Fine materials output by the impurity removing and sorting system enter the jet mill to be subjected to milling treatment. According to the silicon carbide jet milling system, the size of silicon carbide particles can be better controlled through a two-stage crushing mode of a first-stage jaw crusher and a Pasmak double crusher, and the ultrasonic screening machine is arranged for screening, so that the particle sizes fed into a jet mill are the same, and the milling effect of the jet mill is improved; coarse materials screened out by the ultrasonic screening machine are conveyed back to the last procedure through the air conveying pipeline, the effect of coarse material backflow reworking is achieved, the particle size is better controlled, and the product quality is improved through synchronous matching of an impurity removing and sorting system.

Description

Technical Field

[0001] This utility model relates to the field of silicon carbide particle pretreatment technology, specifically a silicon carbide airflow milling system. Background Technology

[0002] Silicon carbide, an inorganic compound with the chemical formula SiC, is produced by smelting raw materials such as quartz sand, petroleum coke (or coal coke), and sawdust (salt needs to be added when producing green silicon carbide) at high temperatures in an electric resistance furnace. Silicon carbide is a semiconductor that exists in nature in the form of the extremely rare mineral moissanite.

[0003] Silicon carbide is typically crushed using a jaw crusher and then fed into an air jet mill for grinding. To address the requirements of high-performance silicon carbide ceramic products for high purity (SiC ≥ 98%), low impurities (Cf < 0.1%, Fe2O3 < 0.1%, magnetic content < 0.01%), and high mesh size (≥ 1500) of silicon carbide powder, this paper addresses the challenges of controlling mesh size and impurity content during the current silicon carbide fine powder preparation process. Furthermore, meeting these requirements often involves chemical methods for impurity removal, resulting in poor grinding efficiency, high costs, and environmental impact. Utility Model Content

[0004] The purpose of this invention is to provide a silicon carbide airflow milling system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A silicon carbide air jet mill system includes a jaw crusher and an air jet mill. The jaw crusher is equipped with a Barmac double crusher at its discharge end, and an ultrasonic screen is equipped with an ultrasonic screen at its discharge end. The fine material output from the ultrasonic screen is sent to a purification and sorting system, and the fine material output from the purification and sorting system enters the air jet mill for grinding.

[0007] As a further embodiment of this utility model: the impurity removal and sorting system includes a vibrating conveyor, a magnetic separator, and a dust collection pipeline. The fine material output end of the ultrasonic sieve is connected to the feed inlet of the vibrating conveyor, the output end of the vibrating conveyor is connected to the feed inlet of the magnetic separator, and a dust collection pipeline is installed above the discharge outlet of the vibrating conveyor, with a fan installed in the dust collection pipeline.

[0008] As a further embodiment of this utility model: the magnetic separator is provided with a magnetic material output end and a non-magnetic material output end, the magnetic material output end is provided with a waste discharge pipeline, and the non-magnetic material output end of the waste discharge pipeline is connected to the feed port of the air jet mill.

[0009] As a further embodiment of this utility model: the air jet mill is equipped with an air compressor, a cyclone collector, a bag filter, and an exhaust pipe. The air inlet of the air jet mill is connected to the air compressor through the pipe, the discharge port of the air jet mill is connected to the cyclone collector, the airflow output end of the cyclone collector is connected to the bag filter, and the bag filter is equipped with an exhaust pipe.

[0010] As a further improvement of this utility model: the discharge end of the jaw crusher is equipped with a Barmac double crusher and a transfer bin a is provided between them.

[0011] As a further embodiment of this utility model: the coarse material output end of the ultrasonic screening machine is provided with a transfer chamber b, and the dust suction pipeline is connected to the output end of the transfer chamber b and the air conveying pipeline through a three-way pipe, and the other end of the air conveying pipeline is connected to the transfer chamber a.

[0012] As a further improvement of this utility model, the top of the transfer chamber a is connected to the air inlet of the bag filter through an airflow pipeline.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This silicon carbide air classifier system utilizes a two-stage crushing method—a jaw crusher followed by a Barmac double crusher—to better control the size of silicon carbide particles. An ultrasonic screener further ensures uniform particle size input to the air classifier, thus improving grinding efficiency. Coarse material screened by the ultrasonic screener is then transported back to the previous process via a pneumatic conveying pipeline, achieving coarse material recirculation and reprocessing, further enhancing particle size control. Simultaneously, a purification and sorting system is integrated to improve product quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a silicon carbide airflow milling system.

[0016] In the diagram: 1. Jaw crusher; 2. Transfer bin a; 3. Barmac double crusher; 4. Ultrasonic screening machine; 5. Vibrating conveyor; 6. Magnetic separator; 7. Air jet mill; 8. Cyclone collector; 9. Bag filter; 10. Air compressor; 11. Waste discharge pipeline; 12. Exhaust duct; 13. Dust suction pipeline; 14. Transfer bin b; 15. Pneumatic conveying pipeline; 16. Airflow pipeline. Detailed Implementation

[0017] Please see Figure 1In this embodiment of the present invention, a silicon carbide airflow milling system includes a jaw crusher 1 and an airflow mill 7. The discharge end of the jaw crusher 1 is equipped with a Barmac double crusher 3, and the discharge end of the Barmac double crusher 3 is equipped with an ultrasonic screener 4. The fine material output end of the ultrasonic screener 4 is sent to a purification and sorting system. The fine material output from the purification and sorting system enters the airflow mill 7 for grinding. Through the primary crushing method of the jaw crusher 1 and the secondary crushing method of the Barmac double crusher 3, the silicon carbide blocks are crushed into granules to reduce the range of particle size unevenness and determine the minimum particle size fluctuation range, so that the fluctuation is controlled from the original 0-10mm to within 0-3mm, reducing the impurity content of the granules and providing the basic conditions for high-quality grinding.

[0018] In a preferred embodiment, the impurity removal and sorting system includes a vibrating conveyor 5, a magnetic separator 6, and a dust collection pipeline 13. The fine material output end of the ultrasonic screening machine 4 is connected to the feed inlet of the vibrating conveyor 5, and the output end of the vibrating conveyor 5 is connected to the feed inlet of the magnetic separator 6. A dust collection pipeline 13 is installed above the discharge port of the vibrating conveyor 5. The dust collection pipeline 13 is equipped with a fan. Under the action of the fan, the dust collection pipeline 13 recovers the dust generated by the vibration inside the vibrating conveyor 5 and performs preliminary dust removal. The dust then enters the magnetic separator 6 for magnetic separation and screening. The magnetic separator 6 is a prior art technology. Minerals are divided into strongly magnetic minerals, weakly magnetic minerals, and non-magnetic minerals. Magnetic separation is a mineral processing method that separates minerals in an uneven magnetic field based on the differences in the magnetic properties of minerals in the ore, separating impurities and silicon carbide.

[0019] In a preferred embodiment, the magnetic separator 6 is provided with a magnetic material output end and a non-magnetic material output end. The magnetic material output end is provided with a waste discharge pipeline 11. The non-magnetic material output end of the waste discharge pipeline 11 is connected to the feed port of the air jet mill 7. Since silicon carbide does not have magnetic separation, the magnetic separator 6 can separate silicon carbide from magnetic impurities such as iron and cobalt.

[0020] In a preferred embodiment, the air classifier mill 7 is equipped with an air compressor 10, a cyclone collector 8, a bag filter 9, and an exhaust duct 12. The air inlet of the air classifier mill 7 is connected to the air compressor 10 via the duct, and the discharge port of the air classifier mill 7 is connected to the cyclone collector 8. The air output end of the cyclone collector 8 is connected to the bag filter 9. The bag filter 9 is equipped with an exhaust duct 12. The air compressor 10 provides air pressure. The characteristic of the mill is that the material is injected into the mill through a nozzle or other means using gas (compressed air or heated steam) as the energy carrier. After the airflow is injected, the material generates high-speed (in many cases, exceeding the speed of sound) motion due to pressure reduction or other reasons.

[0021] In a preferred embodiment, the discharge end of the jaw crusher 1 is provided with a Barmac double crusher 3 and a transfer chamber a2 is provided between them. The bottom of the transfer chamber a2 is a feeder. The transfer chamber a2 has two functions: first, to control the feeding speed, and second, to collect the screened coarse material.

[0022] In a preferred embodiment, the coarse material output end of the ultrasonic screening machine 4 is provided with a transfer chamber b14. The dust suction line 13 is connected to the output end of the transfer chamber b14 and the air conveying line 15 through a three-way pipe. The other end of the air conveying line 15 is connected to the transfer chamber a2. The coarse material enters from the top of the three-way pipe, and the airflow blows the coarse material falling into the three-way pipe into the air conveying line 15, and then into the transfer chamber a2 through the air conveying line 15, so as to achieve the purpose of controlling the particle size of the raw materials.

[0023] In a preferred embodiment, the top of the transfer chamber a2 is connected to the air inlet of the bag filter 9 via an airflow pipeline 16. The recovered airflow contains silicon carbide powder and enters the bag filter 9 for recycling through the airflow pipeline 16.

[0024] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0025] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A silicon carbide air jet mill system, comprising a jaw crusher (1) and an air jet mill (7), characterized in that, The jaw crusher (1) is equipped with a Barmac double crusher (3) at the discharge end, and an ultrasonic screener (4) is equipped at the discharge end of the Barmac double crusher (3). The fine material output end of the ultrasonic screener (4) is sent to the impurity removal and sorting system, and the fine material output from the impurity removal and sorting system enters the air jet mill (7) for grinding.

2. The silicon carbide airflow milling system according to claim 1, characterized in that, The impurity removal and sorting system includes a vibrating conveyor (5), a magnetic separator (6), and a dust collection pipeline (13). The fine material output end of the ultrasonic sieve (4) is connected to the feed inlet of the vibrating conveyor (5), and the output end of the vibrating conveyor (5) is connected to the feed inlet of the magnetic separator (6). A dust collection pipeline (13) is installed above the discharge port of the vibrating conveyor (5), and a fan is provided on the dust collection pipeline (13).

3. The silicon carbide airflow milling system according to claim 2, characterized in that, The magnetic separator (6) is provided with a magnetic material output end and a non-magnetic material output end. The magnetic material output end is provided with a waste discharge pipeline (11). The non-magnetic material output end of the waste discharge pipeline (11) is connected to the feed port of the air jet mill (7).

4. A silicon carbide airflow milling system according to claim 2 or 3, characterized in that, The air mill (7) is equipped with an air compressor (10), a cyclone collector (8), a bag filter (9) and an exhaust pipe (12). The air inlet of the air mill (7) is connected to the air compressor (10) through the pipe, the outlet of the air mill (7) is connected to the cyclone collector (8), the air output end of the cyclone collector (8) is connected to the bag filter (9), and the bag filter (9) is equipped with an exhaust pipe (12).

5. A silicon carbide airflow milling system according to claim 4, characterized in that, The discharge end of the jaw crusher (1) is equipped with a Barmac double crusher (3) and a transfer bin a (2) is provided between them.

6. A silicon carbide airflow milling system according to claim 5, characterized in that, The ultrasonic screening machine (4) has a transfer chamber b (14) at the coarse material output end. The dust suction line (13) is connected to the output end of the transfer chamber b (14) and the air conveying line (15) respectively through a three-way pipe. The other end of the air conveying line (15) is connected to the transfer chamber a (2).

7. A silicon carbide airflow milling system according to claim 6, characterized in that, The top of the transfer chamber a (2) is connected to the air inlet of the bag filter (9) via an airflow pipeline (16).

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