Pulverizing device and pulverizing method for producing potassium-magnesium sulfate

Abstract

This invention relates to the field of mineral crushing technology, specifically disclosing a crushing device and method for preparing potassium magnesium sulfate. The device includes a crushing chamber containing a crushing mechanism, and a feeding mechanism on the top of the crushing chamber. Two feeding mechanisms are symmetrically arranged on the top of the crushing chamber, alternately feeding material into the chamber. Each feeding mechanism includes a discharge trough, a first microwave heating device, and a movable baffle. The first microwave heating device is used to microwave heat the minerals in the discharge trough. This invention, by microwaving the material before crushing, promotes the generation and propagation of cracks, reducing strength and hardness. This not only facilitates subsequent crushing but also results in crushed material with abundant mineral powder and numerous cracks, reducing the difficulty of subsequent ball milling. Simultaneously, it combines the advantages of effective microwave heating and continuous feeding.

Description

Technical Field

[0001] This invention belongs to the technical field of mineral pulverization, specifically relating to a pulverizing device and method for preparing potassium magnesium sulfate. Background Technology

[0002] Potassium magnesium sulfate has a wide range of applications, including in the production of potassium magnesium sulfate fertilizers. The preparation of potassium magnesium sulfate involves mixing and reacting magnesium sulfate and potassium sulfate as raw materials to produce a magnesium magnesium sulfate precipitate. Both magnesium sulfate and potassium sulfate are derived from ores; magnesium sulfate is made from magnesium ore, and potassium sulfate from potassium ore. Both ores require processing to obtain magnesium sulfate and potassium sulfate. The preparation process for magnesium sulfate involves crushing and grinding magnesium ore to obtain magnesium powder, which is then reacted with sulfuric acid to produce magnesium sulfate.

[0003] Crushing and ball milling is a common method for preparing mineral powders. The minerals are first crushed to reduce their particle size, which facilitates subsequent ball milling. Proper crushing can achieve the goal of crushing more and grinding less. In addition, powders prepared by different crushing methods also affect subsequent chemical reactions, which can affect the leaching degree (utilization rate) of the required chemical elements. For example, if the crushing method is not selected properly, the utilization rate of magnesium will decrease during the reaction of magnesium powder with sulfuric acid.

[0004] To facilitate mineral crushing, existing technologies preheat materials with microwaves before crushing. This promotes the generation and propagation of cracks, reducing strength and hardness, and also facilitates subsequent crushing. Existing microwave heating methods generally fall into two categories: one involves adding a microwave heating device to the feed channel, heating the material as it passes through. This method allows for continuous feeding, but the short heating time limits its effectiveness in promoting crack generation and propagation. The other method involves placing the material directly into the microwave heating device, followed by crushing after heating. However, this method cannot achieve continuous feeding, impacting the efficiency of subsequent mineral crushing. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a pulverizing device and method for preparing potassium magnesium sulfate, thereby solving the problems of short microwave heating time and inability to continuously microwave heat and pulverize minerals in existing mineral crushing methods.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, a pulverizing device for preparing potassium magnesium sulfate includes a device body, the device body including a crushing chamber, and two feeding mechanisms are movably provided at the top opening of the crushing chamber, with a gap between the two feeding mechanisms, and the two feeding mechanisms alternately heating the mineral and alternately feeding the crushing chamber.

[0008] The crushing chamber is equipped with a crushing mechanism, a partition and a screen; the partition divides the lower part of the crushing chamber into a collection chamber and a slag discharge chamber; the screen is inclinedly arranged below the crushing mechanism, the upper end of the screen is connected to the inner wall of the crushing chamber, and the lower end of the screen is connected to the top of the partition.

[0009] Preferably, the feeding mechanism includes a feeding trough, a first microwave heating device, and a movable baffle;

[0010] The bottom of the discharge chute is rotatably disposed on the top of the crushing chamber, and the bottom of the discharge chute is movably connected to the telescopic end of the first telescopic component. The two ends of the discharge chute are located on the inner and outer sides of the crushing chamber, respectively. The top of the discharge chute and the end located on the inner side of the crushing chamber are both open ends.

[0011] The first microwave heating device is placed on the housing, which is located at the top opening of the discharge trough; the movable baffle is movably located at the opening end of the inner side of the crushing chamber.

[0012] Preferably, a material-turning component is provided in the material discharge trough; the material-turning component is connected to the second telescopic component via a connecting rod.

[0013] Preferably, the material turning assembly includes a strip connector; the strip connector is provided with a plurality of scraping teeth at its upper and lower ends in the length direction, and there is a gap between two adjacent scraping teeth at the same end; one end of the connecting rod extends into the material discharge groove and is connected to the strip connector, and the other end is connected to the telescopic end of the second telescopic assembly.

[0014] Preferably, the strip connector is arranged perpendicular to the length direction of the feeding mechanism.

[0015] Preferably, the scraper teeth are provided with several through holes; the gap between two adjacent scraper teeth gradually increases from one end of the strip connector to the other end.

[0016] Preferably, the top of the crushing box is provided with two support members, and one of the feeding mechanisms is movably mounted on one of the support members; two vertical plates are symmetrically arranged on the top of the support members; a fixed shaft is provided between the two vertical plates, and a sleeve is provided at the bottom of the discharge chute, the sleeve being movably mounted on the fixed shaft.

[0017] Preferably, the first telescopic component is located below the discharge chute on the outside of the crushing chamber.

[0018] Preferably, a second microwave heating device is provided inside the collecting cavity.

[0019] Secondly, a pulverizing method for a pulverizing apparatus used to prepare potassium magnesium sulfate includes the following steps:

[0020] S1. Control the first telescopic component to descend, causing the feeding mechanism to rotate to an inclined state. At this time, one end of the movable baffle is located at the high end of the feeding mechanism.

[0021] S2. Move the movable baffle upward to open one end of the feeding mechanism located inside the crushing chamber, and add minerals into the feeding mechanism through the opening. After feeding is completed, move the movable baffle downward to close the opening.

[0022] S3. Control the first telescopic component to rise, so that the feeding mechanism rotates to a horizontal state; control the first microwave heating device to turn on, so as to microwave heat the minerals in the feeding mechanism.

[0023] S4. After microwave heating is completed, control the first telescopic component to rise, and the feeding mechanism to rotate to an inclined state. At this time, the end with the movable baffle is located at the lower end of the feeding mechanism.

[0024] S5. Move the movable baffle upward to feed material into the crushing mechanism through the open end, and at the same time, control the crushing mechanism to crush the mineral.

[0025] While one of the feeding mechanisms is feeding the crushing mechanism, the other feeding mechanism is performing mineral microwave heating, so that the two feeding mechanisms alternately feed the crushing mechanism.

[0026] The pulverizing apparatus and pulverizing method for preparing potassium magnesium sulfate provided by this invention have the following beneficial effects:

[0027] 1. The feeding mechanism of this invention is not only for feeding the crushing mechanism, but also has the function of microwave heating the minerals. By microwaving the material before crushing, it can promote the generation and propagation of cracks in the material, reducing its strength and hardness, which is beneficial for subsequent crushing processing. Although existing technologies also use microwave heating on materials before crushing, the effect of microwave heating is related to the heating time. Under the same microwave conditions, the longer the heating time, the better the effect of promoting the generation and propagation of cracks in the material. Existing technologies cannot simultaneously achieve good microwave heating effect and continuous feeding.

[0028] 2. The feeding mechanism designed in this invention has two symmetrically arranged on the top of the crushing box. The two feeding mechanisms alternately feed the crushing box. When one feeding mechanism is used to feed the crushing mechanism, the other feeding mechanism is microwave heated, so that the two feeding mechanisms alternately feed the crushing mechanism. Continuous feeding can be achieved by controlling the material capacity of the feeding mechanism, the microwave heating time, and the feeding time of the feeding mechanism.

[0029] Furthermore, the feeding mechanism designed in this invention differs from traditional feeding mechanisms. This invention features an open end for both feeding and discharging, enabling the introduction of minerals into the feeding mechanism or the feeding of materials into the crushing mechanism. Simultaneously, this open end can be opened and closed via a movable baffle, allowing the feeding mechanism to remain in a closed state during microwave heating. Compared to non-closed feeding methods, this invention improves the microwave heating effect. The feeding mechanism designed in this invention improves the microwave heating effect of minerals in terms of both time and closed structure, while also enabling continuous feeding into the crushing mechanism.

[0030] 3. When the feeding trough is in a horizontal state, compared with an inclined state, the present invention can improve the uniformity of the thickness of the mineral in the feeding trough, making the thickness of the mineral in the feeding trough basically consistent. In order to further ensure the uniformity of the thickness, the feeding trough is preferably a square trough. By setting a turning component in the feeding trough, the mineral in the feeding trough can be turned over by the turning component moving back and forth in the feeding trough, so that the mineral in the feeding trough is heated evenly, thereby improving the microwave heating effect of the mineral.

[0031] 4. In the process of turning the minerals, the minerals can flow between two adjacent scraper teeth or through the through holes on the scraper teeth, which can effectively improve the turning effect of the minerals and indirectly improve the microwave heating effect.

[0032] 5. This invention separates minerals of different sizes by installing a screen below the crushing mechanism and dividing the lower part of the crushing chamber into a collection chamber and a slag discharge chamber by a partition. Smaller minerals, after being screened, enter the collection chamber for collection, while larger minerals are retained on the screen. Because the screen is inclined, the larger minerals fall into the slag discharge chamber for collection. This achieves the separation of minerals of different sizes. Smaller minerals can directly enter the grinder for grinding, while larger minerals undergo microwave heating and crushing again. Separating the crushed minerals facilitates subsequent grinding and reduces grinding time.

[0033] 6. The feeding mechanism of this invention is not only for feeding the crushing mechanism, but also has the function of microwave heating the minerals. The alternating feeding of the two feeding mechanisms can not only achieve continuous feeding to the crushing mechanism, but also make the microwave heating time longer, thus improving the microwave heating effect. Furthermore, the feeding mechanism of this invention has an open end for feeding and discharging, which can realize the introduction of minerals into the feeding mechanism or feeding the crushing mechanism through the feeding mechanism. At the same time, the open end can be opened and closed by a movable baffle, so that the feeding mechanism is in a closed state during microwave heating. Compared with the non-closed heating method, the microwave heating effect is further improved, resulting in more cracks and more mineral powder in the crushed minerals. This allows for the utilization rate of magnesium in the minerals to be improved by utilizing the magnesium dissolution during the subsequent preparation of potassium magnesium sulfate.

[0034] 7. The feeding trough of the present invention is rotatable. When microwave heating is performed, the feeding trough can be rotated to a horizontal state so that the thickness of the mineral in the feeding trough is basically uniform. Furthermore, by setting a turning component in the feeding trough, the mineral in the feeding trough can be turned over by the turning component moving back and forth in the feeding trough, so that the mineral in the feeding trough is heated evenly, which further improves the microwave heating effect of the mineral. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the pulverizing device of the present invention;

[0037] Figure 2 for Figure 1 The left view;

[0038] Figure 3 This is a cross-sectional view of the feeding mechanism of the present invention;

[0039] Figure 4 This is a schematic diagram of the material turning assembly of the present invention;

[0040] Figure 5 This is a schematic diagram of the cooperation between the movable baffle and the discharge chute of the present invention.

[0041] The attached diagram shows the markings and corresponding component names:

[0042] 1- Crushing chamber; 2- Crushing mechanism; 3- Feeding mechanism; 4- Support component; 5- First telescopic component; 6- Second telescopic component; 7- Partition; 8- Screen; 9- Second microwave heating device; 11- Collection chamber; 12- Slag discharge chamber; 31- Discharge chute; 32- First microwave heating device; 33- Movable baffle; 34- Sleeve; 35- Tilting component; 36- Connecting rod; 41- Vertical plate; 42- Horizontal plate; 43- Fixed shaft; 351- Strip connector; 352- Scraper teeth. Detailed Implementation

[0043] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0044] Example 1:

[0045] like Figures 1-5 As shown, the crushing device for preparing potassium magnesium sulfate includes a device body. This embodiment does not limit the specific shape of the device body, but it is preferably cuboid or cylindrical. The device body includes a crushing box 1, the top of which is an open end for feeding. Preferably, the crushing box 1 has a square structure.

[0046] refer to Figure 1 The crushing chamber 1 is equipped with a crushing mechanism 2, which is used to crush minerals. The crushing mechanism 2 is preferably a pressure roller crusher. The top of the crushing chamber 1 is equipped with a feeding mechanism 3. There are two feeding mechanisms 3 symmetrically arranged on the top of the crushing chamber 1, and the two feeding mechanisms 3 alternately feed the crushing mechanism 2.

[0047] In order to enable continuous feeding of the crushing device without stopping and to enable long-term microwave heating of minerals, the feeding mechanism 3 includes a discharge trough 31, a first microwave heating device 32 and a movable baffle 33.

[0048] Specifically, the bottom of the discharge trough 31 is rotatably mounted on the top of the crushing chamber 1, and the bottom of the discharge trough 31 is movably connected to the telescopic end of the first telescopic component 5, specifically through a hinge, etc. The rotation of the discharge trough 31 is achieved by the telescopic movement of the first telescopic component 5 (i.e., one end of the discharge trough 31 moves up or down). The two ends of the discharge trough 31 are respectively placed on the inner and outer sides of the crushing chamber 1. The top of the discharge trough 31 and the end placed on the inner side of the crushing chamber 1 are both open ends. The discharge trough 31 can be rotated to a horizontal state or an inclined state as needed. When in the horizontal state, it is used for microwave heating. When in the inclined state, it is used to introduce minerals into the discharge trough 31 or to transfer the mineral material in the discharge trough 31 to the crushing mechanism 2.

[0049] Specifically, the first telescopic component 5 can be a hydraulic cylinder, a pneumatic cylinder, etc. In this embodiment, a hydraulic cylinder is specifically selected. The specific structure of the bottom of the discharge chute 31 being rotated and set at the top of the crushing box 1 is as follows:

[0050] refer to Figure 2 The top of the crushing chamber 1 is provided with a support member 4. The support member 4 can be a surrounding plate with the same shape as the crushing chamber 1, preferably a square surrounding plate, and the thickness of the support member 4 is greater than the thickness of the crushing chamber 1. Two upright plates 41 are symmetrically arranged on the same side of the top of the support member 4, and a fixed shaft 43 is arranged between the two upright plates 41. A sleeve 34 is provided at the bottom of the feeding trough 31. The sleeve 34 is sleeved on the fixed shaft 43. The feeding mechanism 3 is rotated around the fixed shaft 43 through the sleeve 34. When the mineral in the feeding mechanism 3 is microwave heated, the feeding mechanism 3 is made to be in a horizontal state by operating the first telescopic component 5. When it is necessary to feed the mineral in the feeding mechanism 3 into the crushing chamber 1, the feeding mechanism 3 is made to be in an inclined state by operating the first telescopic component 5, so that the lower end of the feeding mechanism 3 is above the crushing mechanism 2. When it is necessary to introduce mineral into the feeding mechanism 3, the feeding mechanism 3 is made to be in an inclined state by operating the first telescopic component 5, so that the upper end of the feeding mechanism 3 is above the crushing mechanism 2.

[0051] In this embodiment, the feeding trough 31 is rotatable. When microwave heating is performed, the feeding trough 31 can be rotated to a horizontal state so that the thickness of the mineral in the feeding trough 31 is basically uniform. Preferably, the feeding trough 31 is a square trough.

[0052] In a preferred case, refer to Figure 3 In order to further improve the microwave heating effect of the minerals in the discharge trough 31, a turning component 35 is provided in the discharge trough 31. The turning component 35 is connected to the second telescopic component 6 through the connecting rod 36. The turning component 35 moves back and forth in the discharge trough 31 by extending and retracting the second telescopic component 6, thereby turning the minerals in the discharge trough 31.

[0053] The second telescopic component 6 can be a hydraulic cylinder, a pneumatic cylinder, etc. In this embodiment, a hydraulic cylinder is specifically selected. A horizontal plate 42 is provided on the outer side wall of the support member 4, and the second telescopic component 6 is vertically installed on the horizontal plate 42.

[0054] In this embodiment, by setting a turning component 35 in the feeding trough 31, the turning component 35 can move back and forth in the feeding trough 31 to turn the minerals in the feeding trough 31, so that the minerals in the feeding trough 31 are heated evenly, and the microwave heating effect of the minerals is further improved.

[0055] In a preferred case, refer to Figure 4 The material turning component 35 includes a strip connector 351, which can be a directional strip or a columnar strip. The strip connector 351 has several scraper teeth 352 at its upper and lower ends along its length. There is a gap between two adjacent scraper teeth 352 at the same end. One end of the connecting rod 36 extends into the material discharge trough 31 and connects to the strip connector 351, and the other end connects to the telescopic end of the second telescopic component 6.

[0056] Preferably, the scraper teeth 352 are provided with several through holes.

[0057] In this embodiment, the material turning component 35, as described above, allows the minerals to flow between two adjacent scraper teeth 352 or through the through holes on the scraper teeth 352 during the turning process. This effectively improves the turning effect of the minerals and indirectly enhances the microwave heating effect.

[0058] In a preferred embodiment, the gap between two adjacent scraper teeth 352 gradually increases from one end of the strip connector 351 to the other. That is, the width of the scraper teeth 352 gradually decreases from the end connected to the strip connector 351 to the other. This design ensures both a large gap between two adjacent scraper teeth 352 and a large area at the connection between the scraper teeth 352 and the strip connector 351, thereby improving the structural stability of the material turning assembly 35.

[0059] refer to Figure 5 The movable baffle 33 is used to close and open the inner opening of the discharge chute 31 in the crushing box 1. When the movable baffle 33 opens the inner opening of the discharge chute 31 in the crushing box 1, the opening serves as the feed inlet or square material outlet of the feeding mechanism 3. Specifically, the movable baffle 33 can be moved up and down by the extension and retraction of the hydraulic cylinder or by other vertically movable technical means. This embodiment is not limited to this. The vertical displacement of the movable baffle 33 is existing technology and will not be described in detail.

[0060] The first microwave heating device 32 is mounted on top of the discharge trough 31 through a housing. The housing of the first microwave heating device 32 is used to close the top opening of the discharge trough 31, and the first microwave heating device 32 is used to microwave heat the mineral in the discharge trough 31. The first microwave heating device 32 is existing technology and can realize microwave heating. A microwave heating device generally includes a microwave generator, a waveguide, and a microwave port. The microwave generator is used to convert electrical energy into microwaves, the waveguide conducts microwaves rapidly, and the microwave port is used to apply microwave energy to the mineral.

[0061] In a preferred embodiment, the crushing chamber 1 is provided with a partition 7 and a screen 8;

[0062] The partition 7 is arranged vertically and is used to divide the lower part of the crushing box 1 into a collection chamber 11 and a slag discharge chamber 12.

[0063] The screen 8 is inclined and set below the crushing mechanism 2. The high end of the screen 8 is connected to the inner wall of the crushing box 1, and the low end of the screen 8 is connected to the top of the partition 7.

[0064] In a preferred embodiment, a second microwave heating device 9 is provided inside the collecting cavity 11. The second microwave heating device 9 is existing technology and can realize microwave heating.

[0065] The pulverizing method of the pulverizing device in this embodiment includes the following steps:

[0066] S1. Control the first telescopic component 5 to descend, so that the feeding mechanism 3 rotates to an inclined state. At this time, the end with the movable baffle 33 is located at the high end of the feeding mechanism 3.

[0067] S2. Move the movable baffle 33 upward to open one end of the feeding mechanism 3 located inside the crushing box 1, and add minerals into the feeding mechanism 3 through the opening. After feeding is completed, control the movable baffle 33 to move downward to close the opening.

[0068] S3. Control the first telescopic component 5 to rise, so that the feeding mechanism 3 rotates to a horizontal state; control the first microwave heating device 32 to turn on, so as to microwave heat the minerals in the feeding mechanism 3.

[0069] S4. After microwave heating is completed, the controller controls the first telescopic component 5 to rise and the feeding mechanism 3 to rotate to an inclined state. At this time, the end with the movable baffle 33 is located at the lower end of the feeding mechanism 3.

[0070] S5. Control the movable baffle 33 to move upward, feed material into the crushing mechanism 2 through the open end, and at the same time, control the crushing mechanism 2 to start crushing the mineral.

[0071] In this embodiment, while one feeding mechanism 3 is used to feed the crushing mechanism 2, the other feeding mechanism 3 is microwave heated, so that the two feeding mechanisms 3 alternately feed the crushing mechanism 2.

[0072] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A pulverizing device for producing potassium magnesium sulfate, characterized by: Including device body, device body including broken box (1), broken box (1) top opening place activity is equipped with two feeding mechanism (3), two feeding mechanism (3) between the gap, two feeding mechanism (3) alternately mineral heating and alternately to broken box (1) feeding; Broken box (1) inside is provided with broken mechanism (2), broken box (1) is provided with baffle (7) and screen (8);Baffle (7) will the lower part of broken box (1) be separated to form collection cavity (11) and deslagging cavity (12);Screen (8) is obliquely arranged below broken mechanism (2), the high end of screen (8) is connected with the inner wall of broken box (1), and the low end of screen (8) is connected with the top of baffle (7); Feeding mechanism (3) includes discharge chute (31), first microwave heating device (32) and movable baffle (33); The bottom of the discharge chute (31) is rotatably arranged on the top of the broken box (1), and the bottom of the discharge chute (31) is movably connected with the extension end of the first telescopic assembly (5), and the two ends of the discharge chute (31) are located on the inner side and the outer side of the broken box (1) respectively; the top of the discharge chute (31) and the end located on the inner side of the broken box (1) are both open ends; The first microwave heating device (32) is arranged on a shell, and the shell is arranged at the top opening of the discharge chute (31); the movable baffle (33) is movably arranged at the open end on the inner side of the broken box (1); The discharge chute (31) is provided with a turnover assembly (35); the turnover assembly (35) is connected with the second telescopic assembly (6) through a connecting rod (36); The turnover assembly (35) includes a strip-shaped connecting piece (351); a plurality of scraping teeth (352) are arranged at the upper end and the lower end of the strip-shaped connecting piece (351) in the length direction; the connecting rod (36) is connected with the strip-shaped connecting piece (351) at one end and connected with the extension end of the second telescopic assembly (6) at the other end; A plurality of through holes are arranged on the scraping teeth (352); the gap between the adjacent two scraping teeth (352) gradually increases from one end to the other end of the strip-shaped connecting piece (351); The top of the broken box (1) is provided with two supporting pieces (4), and one feeding mechanism (3) is movably arranged on one supporting piece (4); two vertical plates (41) are symmetrically arranged on the top of the supporting piece (4); a fixed shaft (43) is arranged between the two vertical plates (41), and the bottom of the discharge chute (31) is provided with a sleeve (34), and the sleeve (34) is movably arranged on the fixed shaft (43).

2. The pulverizing device for preparing potassium-magnesium sulfate according to claim 1, characterized by: The strip-shaped connecting piece (351) is perpendicular to the length direction of the feeding mechanism (3).

3. The pulverizing device for preparing potassium-magnesium sulfate according to claim 1, characterized by: The first telescopic assembly (5) is arranged below the discharge chute (31) located on the outer side of the broken box (1).

4. The pulverizing device for preparing potassium-magnesium sulfate according to claim 1, characterized by: The second microwave heating device (9) is arranged in the collecting cavity (11).

5. A pulverizing method for a pulverizing apparatus for producing potassium-magnesium sulfate according to any one of claims 1 to 4, characterized by, The method comprises the following steps: S1, control the first telescopic assembly (5) to lower and work, so that the feeding mechanism (3) rotates to an inclined state, at this time, one end of the movable baffle (33) is located at the high end of the feeding mechanism (3); S2, move the movable baffle (33) upward, so that the feeding mechanism (3) is opened at one end inside the crushing box (1), and minerals are added into the feeding mechanism (3) through the opening end, when the feeding is completed, the movable baffle (33) is moved downward to close the opening end; S3, control the first telescopic assembly (5) to rise and work, so that the feeding mechanism (3) rotates to a horizontal state, and control the first microwave heating device (32) to start, so that the minerals in the feeding mechanism (3) are subjected to microwave heating; S4, after the microwave heating is completed, control the first telescopic assembly (5) to rise, so that the feeding mechanism (3) rotates to an inclined state, at this time, one end provided with the movable baffle (33) is located at the low end of the feeding mechanism (3); S5, move the movable baffle (33) upward, and add minerals into the crushing mechanism (2) through the opening end, and at the same time, control the crushing mechanism (2) to crush the minerals; When one of the feeding mechanisms (3) adds minerals into the crushing mechanism (2), the other feeding mechanism (3) heats the minerals by microwave, so that the two feeding mechanisms (3) alternately add minerals into the crushing mechanism (2).

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