CN115846016A - Jet mill and grinding method for preparing high-activity steel slag micro powder from waste steel slag - Google Patents
Jet mill and grinding method for preparing high-activity steel slag micro powder from waste steel slag Download PDFInfo
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- CN115846016A CN115846016A CN202211571323.7A CN202211571323A CN115846016A CN 115846016 A CN115846016 A CN 115846016A CN 202211571323 A CN202211571323 A CN 202211571323A CN 115846016 A CN115846016 A CN 115846016A
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Abstract
The invention relates to the technical field of gas milling, and discloses a jet mill and a grinding method for preparing high-activity steel slag micro powder from waste steel slag.
Description
Technical Field
The invention relates to the technical field of gas milling, in particular to a jet mill and a grinding method for preparing high-activity steel slag micro powder from waste steel slag.
Background
Jet mill, also called as jet mill, for example, jet mill, mainly sprays material to the milling cavity through high-pressure nozzles, then jets and gathers high-speed airflow impact energy and airflow rapidly expands to form fluidized bed suspension boiling to generate collision and friction force to mill the material. The coarse and fine mixed powder passes through the screening device arranged at the top, the fine powder forcibly passes through the screening device and is collected by the cyclone collector and the bag-type dust collector, and the coarse powder is thrown to the four walls by gravity and centrifugal force generated by the screening device rotating at high speed and is settled and returned to the crushing cavity for continuous crushing.
In the practical use process, however, the coarse powder in the waste steel slag is thrown to the four walls and then is settled only by gravity, so that the time required for descending is prolonged, and on the other hand, the settled material cannot accurately fall to the convergence part of the high-pressure air flow nozzle, so that the coarse powder cannot be subjected to rapid secondary collision after the settlement is finished, and the reprocessing efficiency of the filtered coarse powder is low; on the other hand, because the high-speed air current drives the ejection of material, guarantee that the material reaches to high-pressure air current junction, nevertheless equally can make the material receive high-speed air current acceleration back, the wearing and tearing of material aggravation to the pay-off nozzle to make the wearing and tearing aggravation of pay-off subassembly.
Disclosure of Invention
Aiming at the defects of the existing jet mill in the use process in the background art, the invention provides the jet mill and the grinding method for preparing the high-activity steel slag micro powder from the waste steel slag, which have the advantages of accelerating the sedimentation and the re-crushing of coarse powder and solve the technical problems in the background art.
The invention provides the following technical scheme: an airflow mill for preparing high-activity steel slag micropowder from waste steel slag comprises an inner sleeve, wherein an air supplementing pipe is fixedly mounted at the bottom of the inner sleeve, a shell wrapping the inner sleeve is fixedly mounted at one end of the air supplementing pipe, supporting legs are fixedly mounted at the bottom of the shell, a crushing chamber with an upward opening is formed in the inner wall of the inner sleeve, a material conveying chamber is formed in the shell, the inner sleeve is located in the material conveying chamber, a material conveying pipe is movably mounted at the top of the shell, a filtering piece located at the top of the crushing chamber is fixedly mounted at the bottom of the material conveying pipe, a driving motor is fixedly mounted on the surface of the shell, a transmission gear for rotating the material conveying pipe is fixedly mounted on an output shaft of the driving motor, an airflow ring pipe is fixedly mounted on the outer side of the middle of the inner sleeve, an airflow nozzle communicated with the airflow ring pipe is fixedly mounted on the inner wall of the inner sleeve, a material spraying pipe located below the airflow nozzle is fixedly mounted on the bottom of the inner wall of the inner sleeve, the material spraying pipe enables the crushing chamber to be communicated with the bottom of the material conveying chamber, and a material sucking pipe for feeding raw materials to the airflow nozzle is arranged on the shell.
Preferably, the number of the air flow nozzles is four, the four air flow nozzles are arranged on the inner wall of the inner sleeve at equal angles, a fifteen-degree included angle is formed between the center line of each air flow nozzle and the bottom surface of the inner wall of the inner sleeve, and the material spraying guide pipe is positioned below the air flow intersection center of the air flow nozzles.
Preferably, the filter element is formed in an inverted cone shape.
Preferably, the material suction pipe is arranged on the inner side of the material spraying guide pipe and fixedly mounted with the top of the shell, the bottom end of the material suction pipe penetrates through the shell and is located below the shell, the bottom of the shell is fixedly mounted with the material storage box, the material suction pipe is located at the bottom of the inner wall of the material storage box, and a feeding port is formed in the side wall of the material storage box.
Preferably, the bottom of the inner wall of the inner sleeve is provided with a shunting ring groove positioned on the outer side of the material spraying guide pipe, the bottom of the inner wall of the inner sleeve is provided with air injection holes communicated with the shunting ring groove, the number of the air injection holes is at least four, the air supply pipe on the shell is communicated with the shunting ring groove, and the bottom of the shell is provided with an air supply channel communicated with the air supply pipe.
Preferably, the side wall of the bottom of the shell is in threaded connection with an adjusting bolt, the center line of the adjusting bolt is perpendicular to the center line of the air supplementing channel, and the adjusting bolt is screwed in to change the flow area between the air supplementing channel and the air supplementing pipe.
A method for preparing high-activity steel slag micro powder from waste steel slag by using an air current mill comprises the following steps:
s1, placing a waste steel slag raw material in a storage box, introducing compressed air into an air inlet pipe, and driving a motor to drive a material conveying pipe and a filtering piece to rotate through a transmission gear;
s2, compressed air flow in the air flow nozzle is ejected upwards, a material suction pipe sucks material and sends the material to a junction of the compressed air flow of the air flow nozzle, and the air flow nozzle blows the raw material to a filter piece after colliding;
s3, outputting coarse powder into a material conveying chamber by a filter member under the centrifugal force generated by air flow blowing and rotation, and outputting fine powder to the next procedure from a material conveying pipe;
s4, accelerating the sedimentation of coarse powder under the action of the gravity of the coarse powder in the material conveying chamber and the suction force generated by the crushing chamber to the material conveying chamber, and conveying the coarse powder to an airflow nozzle from a material spraying guide pipe to realize re-crushing;
s5, controlling the screwing of the adjusting bolt to enable the total amount of external air input into the crushing chamber from the air injection hole to change, on one hand, blowing and crushing coarse powder settled at the bottom of the crushing chamber again, and on the other hand, controlling the suction force of the material suction pipe for sucking the raw material by controlling the change of external air quantity, namely controlling the feeding speed of the raw material;
s6, according to the above, the circulation work is carried out, and the air grinding and crushing of the waste steel slag raw material are completed.
The invention has the following beneficial effects:
1. the outer shell is arranged on the outer side of the inner sleeve, the filtering piece is arranged in a conical shape, so that when the filtering piece filters powder, coarse powder can be conveyed into the material conveying chamber under the action of centrifugal force and airflow thrust, the airflow nozzle continuously emits compressed airflow upwards to promote the pressure at the bottom of the crushing chamber to be reduced, airflow is sucked from the bottom of the crushing chamber into the material conveying chamber, the coarse powder in the material conveying chamber is subjected to gravity settling and accelerated flow of the airflow to accelerate the settling of the coarse powder in the material conveying chamber, the sucked airflow also emits the coarse powder from the material spraying guide pipe, the filtered coarse powder is directly sprayed to the airflow intersection in the airflow nozzle, secondary crushing is realized, and the purposes of accelerating the settling of the coarse powder and re-crushing are finally achieved.
2. According to the invention, the material suction pipe is arranged in the material spraying guide pipe and is connected to the waste steel slag raw material in the material storage box through the material suction pipe, so that when the airflow in the airflow nozzle impacts and breaks, the suction force on the raw material in the material suction pipe is generated in the crushing chamber, and then the raw material in the material storage box is sucked to the intersection of the airflow nozzle, thereby ensuring that the raw material is sprayed out, replacing a mode that the high-pressure jet flow sprays the material, reducing the phenomenon that the material suction pipe is abraded rapidly due to continuous intervention of compressed airflow, and finally achieving the purpose of self-sucking and feeding.
3. According to the invention, the air supply pipe is arranged at the bottom of the inner sleeve, and the adjusting bolt for controlling the air flow conveying amount of the air supply pipe is arranged on the shell, so that during operation, coarse powder settled at the bottom of the crushing chamber is blown up by air flow sucked by the air supply pipe, and the raw material aggregation in the bottom of the crushing chamber is avoided.
Drawings
FIG. 1 is a schematic view of the overall configuration of the present invention;
FIG. 2 is a schematic view of the overall three-dimensional internal structure of the present invention;
FIG. 3 is an overall sectional front view of the present invention;
FIG. 4 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 3 according to the present invention.
In the figure: 1. an inner sleeve; 2. a crushing chamber; 3. a housing; 4. a material conveying chamber; 5. a filter member; 6. a delivery pipe; 7. a transmission gear; 8. a drive motor; 9. an air flow nozzle; 10. an air inlet pipe; 11. an airflow ring pipe; 12. a support leg; 13. a material storage box; 14. a material suction pipe; 15. an air replenishing channel; 16. adjusting the bolt; 17. a gas supplementing pipe; 18. a shunt ring groove; 19. a gas injection hole; 20. a material spraying conduit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an air flow mill for preparing high activity steel slag micro powder from waste steel slag comprises an inner sleeve 1, an air supply pipe 17 is fixedly installed at the bottom of the inner sleeve 1, an outer shell 3 wrapping the inner sleeve 1 is fixedly installed at one end of the air supply pipe 17, supporting legs 12 for supporting are fixedly installed at the bottom of the outer shell 3, a crushing chamber 2 with an upward opening is opened at the inner wall of the inner sleeve 1, a material conveying chamber 4 is opened inside the outer shell 3, the inner sleeve 1 is located in the material conveying chamber 4, a material conveying pipe 6 is movably installed at the top of the outer shell 3, a filter element 5 located at the top of the crushing chamber 2 is fixedly installed at the bottom of the material conveying pipe 6, a driving motor 8 is fixedly installed on the surface of the outer shell 3, a transmission gear 7 for rotating the material conveying pipe 6 is fixedly installed at an output shaft of the driving motor 8, an air flow nozzle 11 is fixedly installed at the outer side of the middle of the ring pipe 1, an air flow nozzle 9 communicated with the air flow ring pipe 11 is fixedly installed at the inner wall of the inner sleeve 1, a coarse powder filtering nozzle 9 communicated with the material conveying pipe 4 through a coarse powder filtering pipe 14 which is installed in the material conveying chamber 4, coarse powder is filtered by an air flow generated in the coarse powder conveying chamber 4, a coarse powder filtering nozzle 14 which is located in the coarse powder conveying chamber 4 and a coarse powder conveying chamber, a coarse powder filtering nozzle is automatically filtered by a coarse powder conveying pipe 14 which is located in the coarse powder conveying chamber 4, and the settled coarse powder is placed at the air flow nozzle 9 along with the air flow, so that the coarse powder is crushed again by the compressed air flow emitted by the air flow nozzle 9, and the secondary crushing speed of the coarse powder is enhanced.
Referring to fig. 3 and 4, in order to enhance the air flow generated at the bottom of the pulverizing chamber 2 and eject the accelerated air flow toward the filter 5, four air flow nozzles 9 are provided, and the four air flow nozzles 9 are arranged on the inner wall of the inner sleeve 1 at equal angles, and the central line of the air flow nozzle 9 forms a fifteen-degree angle with the bottom surface of the inner wall of the inner sleeve 1, and the material spraying duct 20 is located below the air flow intersection center of the air flow nozzle 9, so that the air flow nozzle 9 is arranged obliquely and upwardly in the inner sleeve 1, so that the blown high-speed air flow is accelerated and moved upwardly, so that a strong suction force is generated at the bottom of the pulverizing chamber 2, and the material spraying duct 20 is located below the air flow intersection of the air flow nozzle 9, so that the material spraying duct 20 is directly located at the compressed air flow intersection of the air flow nozzle 9 after sucking out the coarse powder, thereby enabling the directional conveying and enhancing the pulverizing efficiency of the coarse powder.
Referring to fig. 2 and 3, in order to filter the powder in the crushing chamber 2 by the filter element 5, the filter element 5 is designed to be an inverted cone, so that the filter element 5 can output coarse powder to the material conveying chamber 4 through the airflow and the centrifugal force generated by the rotation of the filter element 5 after being impacted by the airflow, and the filter element 5 directly collides with the airflow in the crushing chamber 2 to promote the fine powder in the airflow to be directly input into the material conveying pipe 6 and conveyed to the subsequent process through the material conveying pipe 6, thereby ensuring the normal operation of the subsequent process.
Referring to fig. 2 and 3, in order to feed the material, the material suction pipe 14 is disposed inside the material spraying pipe 20, the material suction pipe 14 is fixedly mounted on the top of the housing 3, the bottom end of the material suction pipe 14 passes through the housing 3 and is located below the housing 3, the storage box 13 is fixedly mounted on the bottom of the housing 3, the material suction pipe 14 is located at the bottom of the inner wall of the storage box 13, and a material feeding port is formed in the side wall of the storage box 13, so that the material is fed through the material feeding port, and when the air flow is sucked in the crushing chamber 2, the material suction pipe 14 synchronously generates an upward suction force, so that the raw material in the storage box 13 is sucked into the air flow intersection of the air flow nozzle 9, thereby feeding the raw material, and the feeding of the raw material is achieved by the way, thereby preventing the compressed air flow from passing through the material suction pipe 14, and further reducing the phenomenon that the compressed air flow drives the raw material in the material suction pipe 14 to aggravate wear.
Referring to fig. 1 and 3, in order to prevent the aggregation of the powder at the bottom of the pulverizing chamber 2 due to the sedimentation of the coarse powder, a shunting ring groove 18 located outside a material spraying duct 20 is formed at the bottom of the inner wall of the inner sleeve 1, and air injection holes 19 communicated with the shunting ring groove 18 are formed at the bottom of the inner wall of the inner sleeve 1, at least four air injection holes 19 are formed, an oblique angle is formed at the end surface of each air injection hole 19, an air supplement pipe 17 on the outer shell 3 is communicated with the shunting ring groove 18, and an air supplement channel 15 communicated with the air supplement pipe 17 is formed at the bottom of the outer shell 3, so that in the actual use process, the suction force generated at the bottom of the pulverizing chamber 2 is also applied to the air injection holes 19, the external air flow is sucked according to the air injection holes 19, and the powder placed on the air injection holes 19 is blown upwards, thereby preventing the aggregation of the powder at the bottom of the pulverizing chamber 2.
Referring to fig. 1-3, in order to control the material feeding rate in the material suction pipe 14, an adjusting bolt 16 is threadedly connected to a side wall of the bottom of the housing 3, and a center line of the adjusting bolt 16 is perpendicular to a center line of the air supply channel 15, so that the adjusting bolt 16 is screwed in to change a flow area between the air supply channel 15 and the air supply pipe 17, and it is ensured that in the actual working process, the amount of external air entering the bottom of the crushing chamber 2 is controlled by screwing the adjusting bolt 16, and further, the suction force generated by the bottom of the crushing chamber 2 on the material suction pipe 14 is controlled, and the change of the material suction rate by the material suction pipe 14 is changed by changing the size of the suction force, so as to control the material suction amount.
Aiming at the jet milling method for preparing the high-activity steel slag micro powder by the waste steel slag, the method comprises the following steps:
s1, waste steel slag raw materials are placed in a storage box 13, an air inlet pipe 10 is connected with compressed air flow, and a driving motor 8 drives a material conveying pipe 6 and a filtering piece 5 to rotate through a transmission gear 7.
S2, compressed air flow in the air flow nozzle 9 is ejected upwards, the material suction pipe 14 sucks material and sends the material to the intersection of the compressed air flow of the air flow nozzle 9, and the air flow nozzle 9 blows the raw material to the filter piece 5 after colliding.
S3, the filtering piece 5 is blown by airflow and rotates to generate centrifugal force, coarse powder is output to the material conveying chamber 4, and fine powder is output to the next working procedure from the material conveying pipe 6.
S4, the coarse powder in the material conveying chamber 4 is accelerated to settle under the action of the gravity of the coarse powder and the suction force generated in the material conveying chamber 4 by the crushing chamber 2, and the coarse powder is conveyed to the air flow nozzle 9 from the material spraying guide pipe 20 to be crushed again.
S5, controlling the screwing of the adjusting bolt 16 to enable the total amount of external air input into the crushing chamber 2 from the air injection hole 19 to be changed, on one hand, the coarse powder settled at the bottom of the crushing chamber 2 is blown up and crushed again, and on the other hand, controlling the suction force of the suction pipe 14 for sucking the raw material, namely controlling the feeding speed of the raw material, by controlling the change of the external air amount.
S6, according to the above, the circulation work is carried out, and the air grinding and crushing of the waste steel slag raw material are completed.
The working principle of the invention is as follows: when the device is used, the waste steel slag raw material is fed into the material storage box 13 from the feeding port, then, compressed air flow is fed into the air flow ring pipe 11 through the air inlet pipe 10, the air flow nozzle 9 blows the compressed air flow to the center of the crushing chamber 2 through the air flow ring pipe 11, and the driving motor 8 drives the filter piece 5 to rotate synchronously through the transmission gear 7 by the material conveying pipe 6.
When the air flow in the air flow nozzle 9 continuously blows upwards, suction force is generated at the bottom of the crushing chamber 2, raw materials in the suction pipe 14 are sucked out of the storage box 13 and sprayed to the intersection of the air flow nozzle 9 through the sucked raw materials, the raw materials are collided with each other by the compressed air flow sprayed by the air flow nozzle 9, the raw materials collided into powder are conveyed upwards, the fine powder is filtered by the filter piece 5 and then output through the conveying pipe 6, the coarse powder is blown into the conveying chamber 4 by the rotation centrifugal force and the air flow direction impact force of the filter piece 5, meanwhile, the suction force generated at the bottom of the crushing chamber 2 causes the air flow in the conveying chamber 4 to be conveyed into the crushing chamber 2 through the spraying guide pipe 20, the coarse powder in the conveying chamber 4 is subjected to self-gravity and air flow in the conveying chamber 4 to accelerate sedimentation, and after the coarse powder is placed at the bottom of the crushing chamber 2, the coarse powder is sprayed out of the spraying guide pipe 20 again by the suction force generated in the spraying guide pipe 20 and is crushed by the air flow of the raw materials in the suction pipe 14 again through the air flow nozzle 9, and the filtered coarse powder is crushed again.
If the bottom of the crushing chamber 2 is settled, the airflow is conveyed into the diversion ring groove 18 through the air supplementing duct 15 and the air supplementing duct 17 by the external airflow, and the airflow in the diversion ring groove 18 blows the settled coarse powder upwards from the air injection holes 19 by the suction force generated at the bottom of the crushing chamber 2, so that the coarse powder settled in the crushing chamber 2 is crushed again.
When the feeding speed of the raw material in the suction pipe 14 needs to be controlled, the adjusting bolt 16 is controlled to rotate, the adjusting bolt 16 limits the airflow circulation area between the air supplementing channel 15 and the air supplementing pipe 17, when the feeding speed needs to be reduced, the circulation area is increased, at the moment, outside air can be greatly gushed into the shunting ring groove 18 by suction force generated at the bottom of the crushing chamber 2 and is ejected from the air jet holes 19, so that the suction force in the suction pipe 14 is reduced, the raw material in the suction pipe 14 is slowed down and ejected, similarly, when the feeding speed is increased, the circulation area between the air supplementing channel 15 and the air supplementing pipe 17 is reduced, the suction force of the suction pipe 14 is enhanced, the suction of the material is accelerated, and the control on the feeding speed of the material is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The jet mill for preparing the high-activity steel slag micro powder from the waste steel slag comprises an inner sleeve (1), and is characterized in that: the bottom of the inner sleeve (1) is fixedly provided with an air supplementing pipe (17), one end of the air supplementing pipe (17) is fixedly provided with a shell (3) wrapping the inner sleeve (1), the bottom of the shell (3) is fixedly provided with supporting legs (12), the inner wall of the inner sleeve (1) is provided with a crushing chamber (2) with an upward opening, the inside of the shell (3) is provided with a material conveying chamber (4), the inner sleeve (1) is positioned in the material conveying chamber (4), the top of the shell (3) is movably provided with a material conveying pipe (6), the bottom of the material conveying pipe (6) is fixedly provided with a filtering piece (5) positioned at the top of the crushing chamber (2), the surface of the shell (3) is fixedly provided with a driving motor (8), an output shaft of the driving motor (8) is fixedly provided with a transmission gear (7) for rotating the material conveying pipe (6), the middle outer side of the inner sleeve (1) is fixedly provided with an air flow ring pipe (11), the inner wall of the inner sleeve (1) is fixedly provided with an air flow nozzle (9) communicated with the air flow nozzle (10) positioned below the air flow pipe (11), the inner wall of the inner sleeve (1) is fixedly provided with the air flow pipe (10) positioned below the air flow pipe (10), and the material spraying guide pipe (20) realizes the mutual communication of the bottoms of the crushing chamber (2) and the material conveying chamber (4), and a material sucking pipe (14) for supplying raw materials to the air flow nozzle (9) is arranged on the shell (3).
2. The jet mill for preparing high-activity steel slag micropowder from waste steel slag according to claim 1, which is characterized in that: the number of the air flow nozzles (9) is four, the four air flow nozzles (9) are arranged on the inner wall of the inner sleeve (1) at equal angles, a fifteen-degree included angle is formed between the central line of each air flow nozzle (9) and the bottom surface of the inner wall of the inner sleeve (1), and the material spraying guide pipe (20) is located below the air flow intersection center of the air flow nozzles (9).
3. The jet mill for preparing high-activity steel slag micropowder from waste steel slag according to claim 1, which is characterized in that: the filtering piece (5) is in an inverted cone shape.
4. The jet mill for preparing high-activity steel slag micropowder from waste steel slag according to claim 2, is characterized in that: inhale material pipe (14) and set up in the inboard that spouts material pipe (20), and inhale the top fixed mounting of material pipe (14) and shell (3), inhale the bottom of material pipe (14) and pass shell (3) and be located shell (3) below, the bottom fixed mounting of shell (3) has storage case (13), and inhales the inner wall bottom that material pipe (14) is located storage case (13), the pay-off mouth has been seted up to the lateral wall of storage case (13).
5. The airflow mill for preparing high-activity steel slag micropowder from waste steel slag according to claim 4, is characterized in that: the inner wall bottom of endotheca (1) is seted up and is located the reposition of redundant personnel annular (18) that spouts the material pipe (20) outside, and the inner wall bottom of endotheca (1) is seted up and is shunted communicating fumarole (19) of annular (18), the quantity of fumarole (19) has four at least, moisturizing pipe (17) on shell (3) communicate with each other with reposition of redundant personnel annular (18), and the bottom of shell (3) is seted up and is supplemented with the communicating tonifying qi way (15) of moisturizing pipe (17).
6. The airflow mill for preparing high-activity steel slag micropowder from waste steel slag according to claim 5, is characterized in that: the bottom side wall of the shell (3) is in threaded connection with an adjusting bolt (16), the center line of the adjusting bolt (16) is perpendicular to the center line of the air supplementing channel (15), and the adjusting bolt (16) is screwed in to change the flow area between the air supplementing channel (15) and the air supplementing pipe (17).
7. The method for grinding high-activity steel slag micropowder by using air flow mill as claimed in any one of claims 1 to 6, which comprises the following steps:
s1, placing a waste steel slag raw material into a storage box (13), introducing compressed air into an air inlet pipe (10), and driving a motor (8) to drive a material conveying pipe (6) and a filter piece (5) to rotate through a transmission gear (7);
s2, compressed air flow in the air flow nozzle (9) is ejected upwards, a material suction pipe (14) sucks material and sends the sucked material to the junction of the compressed air flow of the air flow nozzle (9), and the air flow nozzle (9) blows the raw material to the filter piece (5) after colliding;
s3, outputting the coarse powder into a material conveying chamber (4) by the filtering piece (5) under the centrifugal force generated by air flow blowing and rotation, and outputting the fine powder to the next procedure from a material conveying pipe (6);
s4, accelerating the sedimentation of coarse powder under the action of the gravity of the coarse powder in the material conveying chamber (4) and the suction force generated in the material conveying chamber (4) by the crushing chamber (2), and conveying the coarse powder to an airflow nozzle (9) from a material spraying guide pipe (20) to realize re-crushing;
s5, controlling the screwing of the adjusting bolt (16) to enable the total amount of external air input into the crushing chamber (2) from the air injection hole (19) to be changed, on one hand, the coarse powder settled at the bottom of the crushing chamber (2) is blown up and crushed again, on the other hand, the suction force of the suction pipe (14) for sucking the raw materials is controlled by controlling the change of the external air amount, namely, the feeding speed of the raw materials is controlled;
s6, according to the above, the circulation work is carried out, and the air grinding and crushing of the waste steel slag raw material are completed.
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