Magnesium spraying device with high absorptivity

Abstract

The invention discloses a high-absorptivity magnesium spraying device which comprises a spheroidizing ladle main body, an annular check ring and an annular cover plate are arranged on the upper middle portion of the ladle wall of the spheroidizing ladle main body, the annular check ring enables molten iron to circularly flow in the spheroidizing ladle main body, and the annular cover plate is matched with the annular check ring to form a backflow structure. An annular check ring and an annular cover plate matched with the annular check ring are additionally arranged on the upper middle portion of the ladle wall, and a unique molten iron backflow structure is formed. By means of the design, the strength and stability of the spheroidizing ladle are enhanced, and more importantly, circulating flow of molten iron in the spheroidizing ladle is promoted. When the magnesium particles are sprayed into the molten iron, the backflow movement of the molten iron is beneficial to uniform distribution and full reaction of the magnesium particles in the molten iron, so that the utilization rate of magnesium is increased, the waste of magnesium can be reduced, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of smelting, and in particular relates to a magnesium spraying device with high absorption rate. Background Art

[0002] In the process of molten iron smelting, the molten iron needs to be transported to the spheroidizing bag for magnesium spraying and spheroidization. During the process of magnesium spraying and desulfurization, magnesium particles may escape after being vaporized. This is mainly due to the behavior and reaction conditions of magnesium particles after vaporization in the molten iron. When magnesium particles are sprayed into the molten iron, due to the high temperature of the molten iron, the magnesium particles will quickly vaporize and generate magnesium vapor. During the floating process of magnesium vapor in the molten iron, the molten iron will be continuously stirred to promote the reaction of magnesium with impurities such as oxygen and sulfur in the molten iron. The magnesium coming out of the spray gun is instantly vaporized to form larger bubbles. After these bubbles are mixed with a carrier gas (such as nitrogen), they rise rapidly near the spray gun. Due to the buoyancy, the large bubbles rise quickly and may escape from the molten iron without sufficient time to fully react with the sulfur in the molten iron. This leads to a low absorption rate of magnesium particles, resulting in a waste of magnesium particles. At the same time, the escape of magnesium vapor may also cause corrosion and pollution to the equipment, increasing the difficulty and cost of equipment maintenance. Summary of the invention

[0003] The object of the present invention is to provide a magnesium spraying device with high absorption rate to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a high-absorption magnesium spraying device, comprising:

[0005] A spheroidizing bag body, wherein an annular retaining ring for allowing the molten iron to circulate in the spheroidizing bag body and an annular cover plate for forming a reflux structure in cooperation with the annular retaining ring are provided at the middle and upper part of the bag wall of the spheroidizing bag body;

[0006] The spheroidizing bag cover is sealed and covered on the port of the spheroidizing bag body. The center of the spheroidizing bag cover is rotatably provided with a spray gun pipe extending to the spheroidizing bag body for uniformly spraying and transporting magnesium particles into the molten iron. The top of the spray gun pipe is sealed and movable with a three-way connecting pipe that does not rotate with the spray gun pipe.

[0007] Preferably, the two sides of the outer side of the spheroidizing bag body are penetrated with feeding pipe openings connected to the external molten iron delivery pipe to deliver the molten iron to the inner side of the spheroidizing bag body, which can avoid the concentrated influx of molten iron causing excessive local impact force, and make the molten iron more evenly distributed in the spheroidizing bag body. The evenly distributed molten iron is conducive to more sufficient contact and reaction between the subsequent magnesium particles and the molten iron, and reduces the situation where some magnesium particles cannot effectively participate in the reaction due to uneven distribution of molten iron.

[0008] Preferably, the spray gun pipe is arranged through the center of the annular cover plate, and a semicircular spray head is provided at the bottom end of the spray gun pipe, and spray holes are evenly provided on the surface of the spray head. The evenly distributed spray holes can spray the magnesium particles into the molten iron at a relatively consistent speed and direction, avoiding the situation where the magnesium particles are concentrated in a certain area, thereby improving the dispersibility of the magnesium particles in the molten iron and promoting the full reaction of magnesium with impurities in the molten iron.

[0009] Preferably, a servo motor is provided at the end of the spheroidizing bag near the spray gun tube, and a main gear is provided on the servo motor, so that the sprayed magnesium particles can form a rotating distribution state in the molten iron. The rotating magnesium particle distribution can increase the contact time and contact area between the magnesium particles and the molten iron, so that the magnesium vapor has more opportunities to react with impurities such as sulfur in the molten iron, and reduce the possibility of magnesium vapor escaping due to rapid floating.

[0010] Preferably, a secondary gear is provided on the outside of the upper end of the spray gun tube, and the spray gun tube rotates to spray the magnesium particles through the meshing of the secondary gear and the main gear, so that the spray gun tube can rotate freely and achieve a good sealing effect. Good sealing can prevent leakage during the process of conveying magnesium particles and inert gas, ensuring that magnesium particles and inert gas can be fully conveyed into the molten iron. The waste of magnesium particles and pollution to the surrounding environment caused by leakage is avoided.

[0011] Preferably, one end of the three-way connecting pipe is provided with a limit connection sleeve that is movably sealed with the top of the spray gun pipe, and a limit sealing ring that is adapted and sealed with the limit connection sleeve is provided on the outside of the top of the spray gun pipe, so that the spray gun pipe can rotate freely and achieve a good sealing effect. A good seal can prevent leakage during the process of conveying magnesium particles and inert gas, ensuring that the magnesium particles and inert gas can be fully conveyed to the molten iron.

[0012] Preferably, the other two ports of the three-way connecting pipe are respectively connected to a storage tank for storing magnesium particles and a nitrogen tank of an inert gas supply system. Nitrogen can isolate the air and prevent the magnesium particles from reacting with oxygen in the air to generate useless substances such as magnesium oxide during transportation. If the magnesium particles are oxidized, their activity will decrease, and their ability to react with impurities in the molten iron will also be weakened, thereby reducing the absorption rate of magnesium.

[0013] Preferably, the upper end surface of the annular retaining ring is in the shape of an outwardly inclined slope, and the side of the lower end surface of the annular cover plate is fitted on the end slope of the annular retaining ring. The reflux can also inhibit the rapid floating of magnesium vapor, so that the magnesium vapor has more time to react with impurities such as sulfur in the molten iron, reducing the escape of magnesium vapor, thereby improving the magnesium absorption rate and desulfurization effect.

[0014] Compared with the prior art, the technical effects and advantages of the present invention are as follows: the high-absorption magnesium spraying device, b. In the design of the spheroidizing bag body, the present invention forms a unique molten iron reflux structure by adding an annular retaining ring and a matching annular cover plate in the middle and upper part of the bag wall. This design not only enhances the strength and stability of the spheroidizing bag, but more importantly, it promotes the circulation of molten iron in the spheroidizing bag. When magnesium particles are sprayed into the molten iron, the reflux movement of the molten iron helps the magnesium particles to be evenly distributed and fully reacted in the molten iron, thereby improving the utilization rate of magnesium, reducing the waste of magnesium, and reducing production costs.

[0015] When the present invention is used, due to the special design of the spheroidizing bag body, the magnesium particles can be evenly dispersed in the molten iron, thereby improving the mixing effect of magnesium and the molten iron. At the same time, the use of inert gas prevents the magnesium particles from reacting with oxygen in the air during transportation and spraying, thereby improving the absorption rate of magnesium. The uniform dispersion and full mixing of the magnesium particles make the magnesium element in the molten iron more uniform, optimizing the spheroidizing effect. Due to the improvement of the magnesium absorption rate and the optimization of the spheroidizing effect, the waste of magnesium and the time of spheroidizing treatment are reduced, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main body of the spheroidizing bag of the present invention;

[0017] Figure 2 It is a three-dimensional schematic diagram of the main body of the spheroidizing bag of the present invention;

[0018] Figure 3 It is a top view schematic diagram of the spheroidization cover of the present invention.

[0019] In the figure: 1. Spheroidizing package body; 2. Feed pipe opening; 3. Annular retaining ring; 4. Annular cover plate; 5. Spheroidizing package cover; 6. Spray gun pipe; 7. Three-way connecting pipe; 8. Spraying head; 9. Spraying through hole; 10. Servo motor; 11. Main gear; 12. Sub gear; 13. Limit connecting sleeve; 14. Limit sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-3 The present invention provides a technical solution: a high-absorption magnesium spraying device, comprising:

[0022] A spheroidizing bag body 1, wherein an annular retaining ring 3 and an annular cover plate 4 cooperating therewith are provided in the middle and upper part of the bag wall of the spheroidizing bag body 1 for allowing the molten iron to circulate in the spheroidizing bag body 1, and a reflux structure is formed therewith. As the core place for containing the molten iron and for the reaction between magnesium and the molten iron, an annular retaining ring 3 and an annular cover plate 4 cooperating therewith are provided in the middle and upper part of the bag wall. The annular retaining ring 3 and the annular cover plate 4 are connected to form a unique reflux structure, and this connection enables the molten iron to circulate in the spheroidizing bag body 1. When magnesium particles are sprayed into the molten iron, the circulating flow of the molten iron can drive the magnesium particles to be more evenly distributed in the molten iron, increase the contact time and area between the magnesium particles and the molten iron, and thus promote the full reaction of magnesium with impurities in the molten iron;

[0023] The spheroidizing bag cover 5 is sealed and covered on the port of the spheroidizing bag body 1. The sealing cover is closed on the port of the spheroidizing bag body 1 to seal the spheroidizing bag body 1 and prevent external air from entering and affecting the internal reaction environment. The center position of the spheroidizing bag cover 5 is rotatably provided with a spray gun pipe 6. This connection method enables the spray gun pipe 6 to rotate on the spheroidizing bag cover 5 and to transport magnesium particles to the molten iron in the spheroidizing bag body 1. The spheroidizing bag cover 5 provides a stable support and rotation basis for the spray gun pipe 6 to ensure that the spray gun pipe 6 can work normally. The center position of the spheroidizing bag cover 5 is rotatably provided with a spray gun pipe 6 extending to the spheroidizing bag body 1 for evenly spraying and transporting magnesium particles to the molten iron. The top end of the spray gun pipe 6 is sealed and movable with a three-way connecting pipe 7 that does not rotate with the spray gun pipe 6.

[0024] The spheroidizing bag body 1 is provided with feed pipe openings 2 on both sides of the outside thereof, which are connected to the external molten iron delivery pipe to deliver the molten iron to the inside of the spheroidizing bag body 1. The feed pipe openings 2 are provided on both sides of the outside of the spheroidizing bag body 1, and are connected to the external molten iron delivery pipe. This connection method ensures that the molten iron can be smoothly delivered from the outside to the inside of the spheroidizing bag body 1. The feed pipe openings 2 are provided on both sides, so that the molten iron can enter the spheroidizing bag body 1 from different directions, avoiding the concentrated influx of the molten iron causing excessive local impact force, and helping the molten iron to be more evenly distributed in the spheroidizing bag body 1.

[0025] The spray gun pipe 6 is arranged at the center of the annular cover plate 4. This connection ensures that the magnesium particles sprayed from the spray gun pipe 6 can be relatively evenly diffused around the molten iron in the spheroidizing bag main body 1, and a semicircular spray head 8 is provided at the bottom of the spray gun pipe 6, and spray holes 9 are evenly provided on the surface of the spray head 8. When the magnesium particles are transported to the spray head 8 through the spray gun pipe 6, they will be evenly and stably sprayed into the molten iron through the spray holes 9. The semicircular spray head 8 design expands the spray range of the magnesium particles, is more in line with the distribution of the molten iron in the spheroidizing bag main body 1, is conducive to improving the dispersibility of the magnesium particles in the molten iron, and then promotes the full reaction of magnesium with impurities in the molten iron.

[0026] A servo motor 10 is provided at one end of the spheroidizing cover 5 near the spray gun tube 6, and a main gear 11 is provided on the servo motor 10. A sub gear 12 is provided on the outside of the upper end of the spray gun tube 6, and the spray gun tube 6 rotates to spray magnesium particles through the meshing of the sub gear 12 and the main gear 11, so that the servo motor 10 can transmit power to the spray gun tube 6 to drive the spray gun tube 6 to rotate. The rotation of the spray gun tube 6 can make the sprayed magnesium particles form a rotating distribution in the molten iron, increase the contact time and area of ​​the magnesium particles with the molten iron, reduce the possibility of magnesium vapor escaping due to rapid floating, and improve the absorption rate of magnesium.

[0027] One end of the three-way connecting pipe 7 is provided with a limit connecting sleeve 13 that is movably and sealably connected to the top of the spray gun pipe 6, and the top of the spray gun pipe 6 is provided with a limit sealing ring 14 that is adapted and sealed to the limit connecting sleeve 13, ensuring the movable connection between the three-way connecting pipe 7 and the spray gun pipe 6, so that the spray gun pipe 6 can rotate freely and achieve a good sealing effect. Through this sealed movable connection, leakage can be prevented during the process of conveying magnesium particles and inert gas, ensuring that the magnesium particles and inert gas can be fully conveyed to the molten iron.

[0028] The other two ports of the three-way connecting pipe 7 are respectively connected to the storage tank for storing magnesium particles and the nitrogen tank of the inert gas supply system, so that the magnesium particles can be transported from the storage tank to the molten iron through the three-way connecting pipe 7 and the spray gun pipe 6 under the protection of the inert gas (nitrogen). Nitrogen can isolate the air and prevent the magnesium particles from reacting with oxygen in the air to generate useless substances such as magnesium oxide during the transportation process, ensuring that the magnesium particles enter the molten iron in a highly active state and fully react with impurities such as sulfur in the molten iron.

[0029] The upper end surface of the annular retaining ring 3 is in the shape of an outwardly inclined slope, and the side of the lower end surface of the annular cover plate 4 is attached to the end slope of the annular retaining ring 3, which can better guide the molten iron to form a stable reflux. When the molten iron flows in the spheroidizing bag main body 1, the inclined surface of the annular retaining ring 3 will cause the molten iron to flow along the inclined surface direction to form a regular circulation path. The stable reflux of the molten iron can drive the magnesium particles to circulate continuously in the molten iron, increase the contact time and reaction opportunity of the magnesium particles with the molten iron, and at the same time inhibit the rapid floating of magnesium vapor and reduce the escape of magnesium vapor, thereby improving the absorption rate of magnesium and the desulfurization effect.

[0030] After adopting this invention, the unit consumption of magnesium is reduced by 0.1kg, 500,000 tons of molten iron can be spheroidized annually, 500,000*0.1kg / 1000=50 tons of magnesium particles can be saved, the unit price of each ton of magnesium particles is 20,000 yuan, and the annual cost saving is 20,000*50=1 million yuan.

[0031] Reducing iron loss by 300kg / shift can reduce iron loss by 300*360*2=216 tons per year, increasing efficiency by 216*2800=604,800 yuan / year, and increasing efficiency by a total of 1,604,800 yuan / year.

[0032] In summary, the present invention provides a new type of high-efficiency magnesium spraying device, which achieves full mixing and efficient reaction of magnesium and molten iron by optimizing the device structure and working principle, improves the absorption rate of magnesium, optimizes the spheroidization effect, and reduces costs.

[0033] Specific production process:

[0034] The present invention relates to a novel high-absorption magnesium spraying device, which specifically comprises the following steps: The following is a step-by-step introduction to the working principle of the novel high-absorption magnesium spraying device:

[0035] Step 1: Device preparation and startup

[0036] Device structure: The reflux magnesium spraying device is mainly composed of a spheroidizing bag body 1, a spheroidizing bag cover 5, a servo motor, a spray gun pipe 6, and a three-way connecting pipe 7. The other two ports are respectively connected to an external storage tank for storing magnesium particles and a nitrogen tank of an inert gas supply system.

[0037] Material preparation: Pour the molten iron into the main body of the spheroidizing bag through the feed pipe 2, and ensure that the temperature and composition of the molten iron meet the process requirements. At the same time, store the magnesium particles in the magnesium particle storage tank and prepare the supply of inert gas (such as nitrogen).

[0038] Device startup: close the spheroidizing bag cover 5, start the servo motor 10 to drive the main gear 11 to mesh and drive the sub-gear 12 to rotate, the rotation of the sub-gear 12 causes the spray gun tube 6 to start rotating, and the three-way connecting pipe 7 does not rotate with it. At the same time, open the inert gas supply system to provide protection for the transportation and spraying of magnesium particles.

[0039] Step 2: Transportation and spraying of magnesium particles

[0040] Magnesium particle transportation: Under the protection of inert gas, magnesium particles are transported from the magnesium particle storage tank through the powder spraying pipe to the spray gun pipe 6. The use of inert gas can prevent the magnesium particles from reacting with oxygen in the air during transportation and avoid the generation of useless substances such as magnesium oxide.

[0041] Magnesium particle spraying: When the magnesium particles reach the inside of the spray head 8, they are sprayed into the molten iron through a plurality of evenly distributed spray holes 9. The special design of the spray head 8 ensures that the magnesium particles are evenly dispersed in the molten iron in the form of mist, increasing the contact area between the magnesium particles and the molten iron, thereby improving the reaction efficiency.

[0042] Step 3: Iron reflux and magnesium absorption

[0043] Iron liquid reflux: In the internal structure of the spheroidizing bag main body 1, a reflux channel for iron liquid is formed by adding an annular retaining ring 3 and an annular cover plate 4. When magnesium particles are sprayed into the iron liquid, the iron liquid circulates in the reflux channel, which helps the magnesium particles to be evenly distributed in the iron liquid and fully react.

[0044] Absorption of magnesium: During the reflux of the molten iron, the magnesium particles fully contact and react with the molten iron. Magnesium reacts with sulfur and other elements in the molten iron to produce compounds such as magnesium sulfide. These compounds are evenly distributed in the molten iron, which helps to improve the quality and performance of the molten iron.

[0045] Step 4: Reaction completion and subsequent processing

[0046] Reaction completion: When the magnesium particles fully react with the iron liquid, the absorption rate of magnesium reaches the expected target. At this time, the spray gun pipe 6 and the inert gas supply system can be closed to stop the delivery and spraying of the magnesium particles.

[0047] Subsequent treatment: The reacted molten iron is discharged from the spheroidizing bag body 1 for subsequent smelting and treatment. At the same time, the spheroidizing bag body and the spray gun pipe 6 and other devices are cleaned and maintained to ensure smooth use next time.

[0048] In summary, the working principle of a high-absorption magnesium spraying device involves the coordinated work of multiple steps and components. By optimizing the device structure and working principle, the full mixing and efficient reaction of magnesium and molten iron can be achieved, thereby improving the absorption rate of magnesium, optimizing the quality and performance of molten iron, and reducing production costs.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-absorption magnesium spraying device, characterized in that: include: A spheroidizing bag body (1), wherein an annular retaining ring (3) for allowing molten iron to circulate in the spheroidizing bag body (1) and an annular cover plate (4) for forming a reflux structure in cooperation with the annular retaining ring (3) are provided at the middle and upper part of the bag wall of the spheroidizing bag body (1); A spheroidizing bag cover (5) is sealed and covered on the port of the spheroidizing bag body (1). A spray gun pipe (6) extending to the spheroidizing bag body (1) and used for uniformly spraying and transporting magnesium particles into the molten iron is rotatably provided at the center of the spheroidizing bag cover (5). The top end of the spray gun pipe (6) is sealed and movably provided with a three-way connecting pipe (7) that does not rotate with the spray gun pipe (6).

2. A high-absorption magnesium spraying device according to claim 1, characterized in that: Feeding pipe openings (2) are provided on both sides of the exterior of the spheroidizing bag main body (1) and are connected to an external molten iron delivery pipe to deliver the molten iron to the interior of the spheroidizing bag main body (1).

3. A high-absorption magnesium spraying device according to claim 1, characterized in that: The spray gun pipe (6) is arranged to penetrate the center position of the annular cover plate (4), and a semicircular spray head (8) is arranged at the bottom end of the spray gun pipe (6), and spray through holes (9) are evenly arranged on the surface of the spray head (8).

4. A high-absorption magnesium spraying device according to claim 1, characterized in that: A servo motor (10) is provided on one side of the end of the spheroidizing bag cover (5) close to the spray gun tube (6), and a main gear (11) is provided on the servo motor (10).

5. A high-absorption magnesium spraying device according to claim 4, characterized in that: A secondary gear (12) is provided on the outside of the upper end of the spray gun tube (6), and the spray gun tube (6) rotates to spray magnesium particles through the meshing of the secondary gear (12) and the main gear (11).

6. A high-absorption magnesium spraying device according to claim 1, characterized in that: One end of the three-way connecting pipe (7) is provided with a limiting connection sleeve (13) that is movably and sealingly sleeved with the top end of the spray gun pipe (6), and the top end of the spray gun pipe (6) is externally provided with a limiting sealing ring (14) that is adaptively and sealingly connected to the limiting connection sleeve (13).

7. A high-absorption magnesium spraying device according to claim 1, characterized in that: The other two ports of the three-way connecting pipe (7) are respectively connected to a storage tank for storing magnesium particles outside and a nitrogen tank of an inert gas supply system.

8. A high-absorption magnesium spraying device according to claim 1, characterized in that: The upper end surface of the annular retaining ring (3) is in the shape of an inclined surface inclined outward, and the side of the lower end surface of the annular cover plate (4) is fitted around the inclined surface at the end of the annular retaining ring (3).

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