CN106987684B - Desulfurization spray gun - Google Patents
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- CN106987684B CN106987684B CN201710338638.XA CN201710338638A CN106987684B CN 106987684 B CN106987684 B CN 106987684B CN 201710338638 A CN201710338638 A CN 201710338638A CN 106987684 B CN106987684 B CN 106987684B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a desulfurization spray gun which comprises a gun body, wherein a main spray head and a plurality of auxiliary spray heads are arranged on the gun body, the main spray head is arranged at the bottommost part of the gun body, the auxiliary spray heads are dispersedly arranged at the middle lower part of the gun body, a blowing channel is arranged in the gun body, and the main spray head and the auxiliary spray heads are connected with the blowing channel. The invention can improve the utilization rate of magnesium and the desulfurization efficiency.
Description
Technical Field
The invention belongs to the field of molten iron pretreatment in ferrous metallurgy technology, and particularly relates to a rotary type multi-stage magnesium spraying desulfurization spray gun.
Background
At present, the desulfurization by blowing passivated magnesium particles in the molten iron pretreatment process becomes a mainstream desulfurization process in domestic steel mills, and after the passivated magnesium particles are blown into molten steel, magnesium reacts with sulfur to obtain magnesium sulfide: mg + S → MgS, mgS floats to the slag layer, and MgS is removed in the subsequent slag removing operation to finish the desulfurization operation.
However, since the melting point of magnesium is 648 ℃, the boiling point is 1107 ℃ and the temperature of molten iron is generally 1250 ℃ or above, magnesium is gasified after being sprayed into molten iron and becomes magnesium vapor bubbles, and the saturation solubility of magnesium in low-temperature molten iron is very small, as described in the article "physicochemical process for desulfurizing molten iron with magnesium metal particles" by guo han jie and li gui yang, the saturation solubility of magnesium in molten iron at 1523K temperature is: 0.0041%, it is difficult to dissolve a large amount of the gasified magnesium vapor in the molten iron. If the magnesium injected into the molten iron does not rapidly react with the magnesium, the magnesium partially escapes from the molten iron in the form of magnesium vapor bubbles, resulting in a low utilization rate of magnesium.
According to the theory of the physical chemistry of the metal magnesium granule molten iron desulphurization process of the patent of hongtao, wangyong and the like, the utilization rate of magnesium generally fluctuates between 17% and 41% in the desulphurization process by blowing passivated magnesium granules. The utilization rate of magnesium is low, so that the desulfurization speed is slowed, and huge waste of magnesium resources is caused, a large amount of magnesium resources are volatilized into air before reacting with sulfur, how to improve the dynamic condition of the reaction of magnesium and sulfur injected into molten iron and improve the reaction speed of magnesium and sulfur become the key for improving the utilization rate of magnesium.
Patent application CN201510879090 discloses a torpedo ladle molten iron desulfurization spray gun device and desulfurization method that can change jetting angle, the device that this technique provided comprises the guide frame elevating system of installing on the workstation, the guide frame, the spray gun pole and the spray gun pole actuating mechanism of installing on the guide frame, can control the guide frame through guide frame elevating system and install the lift of the spray gun pole on the guide frame, the motor drive lead screw of installing on the guide frame rotates with equidirectional simultaneously, it does the circulation swing around the rotation support respectively to drive two spray gun poles through drawing the swing rocker. Compared with the conventional desulfurization spray gun of the existing torpedo tank, the method can expand the desulfurization range, improve the dynamic performance of the molten iron desulfurization reaction of the torpedo tank, effectively improve the reversion phenomenon caused by the blowing desulfurization of a single spray gun, improve the desulfurization efficiency and the desulfurization quality, reduce the desulfurization cost and have better economic benefit under the condition of not changing the size of the tank opening of the torpedo tank.
Disclosure of Invention
In order to solve the problems that the utilization rate of magnesium is low and the desulfurization kinetics is to be improved in the prior art, the invention provides a rotary multi-stage magnesium-spraying desulfurization spray gun.
The desulfurization spray gun provided by the invention comprises a gun body, wherein a main spray head and a plurality of auxiliary spray heads are arranged on the gun body, the main spray head is arranged at the bottommost part of the gun body, the auxiliary spray heads are dispersedly arranged at the middle lower part of the gun body, a blowing channel is arranged in the gun body, and the main spray head and the auxiliary spray heads are connected with the blowing channel. The desulfurization spray gun is connected with the transmission mechanism, and the transmission mechanism drives the desulfurization spray gun to do self-rotation motion in the magnesium spraying desulfurization process. As a better choice of the desulfurization spray gun, the main spray head is in a bell mouth shape.
As a better choice of the desulfurization spray gun, the distance between the adjacent auxiliary spray heads is 100-300mm. The auxiliary nozzles are uniformly or non-uniformly distributed in the vertical direction, and a certain distance is kept between the nozzles, so that the effect of blowing in a three-dimensional range in the ladle is achieved.
As a better alternative to the above-mentioned desulfurization lances, the projections of the secondary lances in the radial direction of the lance or the bottom of the ladle are distributed uniformly over a circumference.
As a better choice of the desulfurization spray gun, the appearance of the auxiliary spray head is in a bell mouth shape, and the auxiliary spray head extends out of the gun body by about 100-300mm.
As a better alternative to the above-mentioned desulfurization spray gun, the blowing channel gradually becomes smaller in the blowing direction, and the inner diameter of the blowing channel decreases every time the blowing channel passes through one sub-nozzle.
As a better choice of the desulfurization spray gun, the inner diameter of the blowing channel is reduced by 10-20% at the auxiliary spray head.
As a better choice of the desulfurization spray gun, the desulfurization spray gun is connected with the sealing bearing and is driven to rotate by the transmission mechanism.
As a better choice of the desulfurization spray gun, the blowing channel is connected with a blowing hose, and the blowing hose is connected with a nitrogen gas storage source and a passivated magnesium storage pipe.
As a better choice of the desulfurization spray gun, the gun body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer, a refractory material framework, a steel liner, an inner layer refractory material layer and a blowing and spraying channel from outside to inside along the inner diameter direction.
According to the invention, a certain number of auxiliary gun heads are additionally arranged at the middle lower part of the gun body of the desulfurization spray gun, and the auxiliary gun heads are distributed in a three-dimensional manner, so that the effect of spraying in a three-dimensional range in a ladle can be achieved. In the process of blowing the magnesium particles, the gun body performs self-spinning motion, the effect of stirring molten iron can be achieved through the rotation of the gun body, the spray gun is used for blowing and passivating the magnesium particles for desulfurization, the magnesium particles can be uniformly dispersed into the molten iron, the kinetic condition of the reaction of the magnesium particles and sulfur in the molten iron in the whole three-dimensional range of the ladle can be improved, and the utilization rate of magnesium is improved.
In the invention, the spray head at the bottommost part of the desulfurization spray gun is a main spray head in a horn mouth shape, besides the main spray head at the bottommost part of the desulfurization spray gun, 2-5 magnesium particle spraying points are additionally arranged on the gun body at the middle lower part of the desulfurization spray gun, an auxiliary spray head for spraying magnesium particles is arranged on each magnesium particle spraying point, the 2-5 auxiliary spray heads for spraying magnesium particles are arranged along the gun body from top to bottom, the distance between the auxiliary spray heads is 100-300mm, the 2-5 auxiliary spray heads for spraying magnesium particles are projected at 2-5 positions uniformly distributed on one circumference on the bottom of a ladle, and the auxiliary spray heads are in the horn mouth shape and extend out of the gun body by 100-300mm. In order to ensure that magnesium particles can be smoothly sprayed out from the auxiliary spray heads, the inner diameter of a channel for spraying the magnesium particles in the gun body is obviously reduced at the auxiliary spray heads, and the inner diameter of the spraying channel in the gun body is reduced by 10 to 20 percent from top to bottom when the magnesium particles pass through one auxiliary spray head.
When the desulfurization spray gun is used for spraying magnesium particles, the spray gun performs self-rotating motion while spraying magnesium particles, and the auxiliary spray head on the gun body performs circular motion along with the gun body, so that the magnesium particles sprayed by the auxiliary spray head can be uniformly sprayed into a horizontal plane where the spray head is positioned, and the auxiliary spray head can also play a role in stirring molten iron during the self-rotating motion of the gun body due to the fact that the horn-shaped auxiliary spray head extends out of the gun body by 100-300mm, so that the diffusion flow of magnesium in the molten iron is promoted, and the dynamic conditions of magnesium particle desulfurization reaction are improved.
The gun body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer, a refractory material framework, a steel liner, an inner layer refractory material layer and a spray pipe from outside to inside along the inner diameter direction, wherein the outer layer refractory material layer plays a role in resisting erosion of molten iron on the gun body; the refractory material framework is formed by fixing transverse annular steel bars and longitudinal steel bars in a crossed manner to form a net shape, and is welded on the steel liner to play a role in fixing the outer-layer refractory material; the steel liner is a steel round tube and plays a role in supporting the gun body of the spray gun; the inner layer refractory material layer can resist the erosion of molten iron to the spray pipe and also can play a role in filling materials between the steel pipe and the spray pipe; the spray pipe is a high-manganese wear-resistant steel pipe, and passivated magnesium particles and nitrogen are sprayed in the spray pipe.
The invention has the following beneficial effects:
1. the auxiliary spray heads are additionally arranged along the middle lower part of the gun body of the magnesium spraying desulfurization gun, and are distributed in the larger longitudinal and transverse ranges in the ladle, so that the magnesium spraying range in the ladle can be enlarged, the sprayed magnesium particles can be uniformly distributed in molten iron, the probability of overflow of magnesium in the molten iron due to overfalling is reduced, the reaction range of magnesium and sulfur is widened, and the reaction speed of magnesium and sulfur is improved.
2. During the desulfurization process, the spray gun makes self-rotating motion, the spray head on the gun body makes circular motion along with the gun body, the spray head sprays magnesium into molten iron along a circular track, magnesium particles can be uniformly sprayed into the molten iron nearby a circumferential plane, and during the self-rotating process of the spray gun, the auxiliary spray head in the shape of a horn mouth has a stirring effect on the molten iron, so that the flowing of the molten iron and the mixing of magnesium steam and the molten iron are promoted, the mass transfer condition of the magnesium steam in the molten iron is improved, and the kinetic condition that the magnesium is dissolved into the molten iron or reacts with sulfur is improved.
Drawings
FIG. 1 is a schematic view of a rotary multi-stage magnesium-blasting desulfurization gun;
FIG. 2 is a top view of a rotary multi-stage magnesium-spraying desulfurization gun;
FIG. 3 is a sectional view of the gun body of the magnesium-spraying desulfurization gun.
The attached drawings are as follows:
1: a nitrogen gas storage source; 2: passivating the magnesium storage tube; 3: a blowing hose; 4: sealing the bearing; 5: a transmission mechanism; 6: a gun body; 7: a ladle; 8: molten iron; 9: an auxiliary spray head; 10: a main spray head; 11: a blowing channel; 12: an inner layer of refractory material; 13: a steel liner; 14: a refractory material skeleton; 15: an outer layer of refractory material.
Detailed Description
The following schematic diagrams of the apparatus 1-3 illustrate a rotary multi-stage magnesium-spraying desulfurization gun, which is merely for the purpose of explanation and not limitation.
As shown in fig. 1-3, a gun body 6 of the rotary multi-stage magnesium-spraying desulfurization gun is connected with a nitrogen gas storage source 1 and a passivated magnesium storage tank 2 through a spraying hose 3, the gun body 6 of the spray gun is connected with the spraying hose 3 through a sealed bearing 4, the gun body 6 of the spray gun is further connected with a transmission mechanism 5, and the transmission mechanism 5 drives the rotary multi-stage magnesium-spraying desulfurization gun to make a self-rotating motion in the magnesium-spraying desulfurization process.
The spray head at the bottommost part of the spray gun is a main spray head 10 of a magnesium-spraying desulfurization gun, the spray head is in a horn mouth shape, in addition to the spray head 10 at the bottommost part of the spray gun, 2-5 positions are additionally arranged on a gun body at the middle lower part of the spray gun to be magnesium particle spraying points, an auxiliary spray head 9 for spraying magnesium particles is arranged on each magnesium particle spraying point, the 2-5 auxiliary spray heads 9 for spraying magnesium particles are arranged along the gun body 6 from top to bottom, the distance between every two adjacent auxiliary spray heads 9 is 100-300mm, the projection of the 2-5 auxiliary spray heads 9 for spraying magnesium particles on the bottom of a ladle 7 or in the radial direction of the spray gun is 2-5 positions uniformly distributed on one circumference, and the appearance of each auxiliary spray head 9 is in a horn mouth shape and extends out of the gun body 6 by about 100-300mm; in order to ensure that magnesium particles can be smoothly sprayed out from the auxiliary spray heads 9, the inner diameter of the spraying channel 11 in the gun body 6 is obviously reduced at the auxiliary spray heads 9, and the inner diameter of the spraying channel 11 in the gun body 6 is reduced by 10 to 20 percent from top to bottom when passing through one auxiliary spray head 9.
During the process of blowing the magnesium particles, the spray gun performs self-rotating motion while blowing the magnesium particles, the rotating speed is 5-60 r/min, the auxiliary spray head 9 on the rotary gun body performs circular motion along with the gun body, so that the magnesium particles sprayed by the auxiliary spray head 9 can be uniformly blown into a horizontal plane where the auxiliary spray head 9 is positioned, and because the horn-mouth-shaped auxiliary spray head 9 extends out of the gun body 6 by about 100-300mm, during the process of performing the self-rotating motion of the gun body 6, the auxiliary spray head 9 can also play a role of stirring molten iron 8, thereby promoting the diffusion flow of magnesium in the molten iron and improving the dynamic conditions of the magnesium particle desulfurization reaction.
The lance body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer 15, a refractory material framework 14, a steel liner 13, an inner layer refractory material layer 12 and a spraying and blowing channel 11 from outside to inside along the inner diameter direction, wherein the outer layer refractory material layer 15 plays a role in resisting erosion of molten iron 8 on the lance body 6; the refractory material framework 14 is formed by fixing transverse annular steel bars and longitudinal steel bars in a crossed manner to form a net shape, and is welded on the steel liner 13 to play a role in fixing the outer-layer refractory material 15; the steel liner 13 is a steel round tube and plays a role in supporting the gun 6 body; the inner layer refractory material layer 12 can not only resist the erosion of molten iron to the spray pipe, but also play a role in filling materials between the steel pipe and the spray pipe; the blowing channel 11 is a high-manganese wear-resistant steel pipe, and passivated magnesium particles and nitrogen are blown in the nozzle.
Examples 1,
As shown in fig. 1, 2 and 3, a gun body 6 of the rotary multi-stage magnesium-spraying desulfurization gun is connected with a nitrogen gas storage source 1 and a passivated magnesium storage tank 2 through a spraying hose 3, the gun body 6 of the spray gun is connected with the spraying hose 3 through a sealing bearing 4, the gun body 6 of the spray gun is also connected with a transmission mechanism 5, and the transmission mechanism 5 drives the rotary multi-stage magnesium-spraying desulfurization gun to do self-rotation motion in the magnesium-spraying desulfurization process.
The outer diameter of the magnesium-spraying desulfurization gun is 350mm, the inner diameter of a spraying channel 11 in the magnesium-spraying desulfurization gun is 15mm, the spray head at the bottommost part of the magnesium-spraying desulfurization gun is a main spray head 10 in a horn shape, in addition to the spray head 10 at the bottommost part of the spray gun, 2 positions are additionally arranged on the gun body at the middle lower part of the spray gun to be magnesium particle spraying points, an auxiliary spray head 9 for spraying magnesium particles is arranged on each magnesium particle spraying point, the 2 auxiliary spray heads 9 for spraying magnesium particles are arranged from top to bottom along the gun body 6, the distance between every two auxiliary spray heads 9 is 300mm, the projection of the 2 auxiliary spray heads 9 for spraying magnesium particles on the bottom of the ladle 7 is 2 positions uniformly distributed on one circumference, the appearance of each auxiliary spray head 9 is in a horn shape and extends out of the gun body 6 by about 300mm; in order to ensure that magnesium particles can be smoothly sprayed out from the auxiliary spray heads 9, the inner diameter of the spraying channel 11 in the gun body 6 is obviously reduced at the auxiliary spray heads 9, from top to bottom, the inner diameter of the spraying channel 11 in the gun body 6 is reduced by 20 percent when passing through one auxiliary spray head 9, and the inner diameter of each auxiliary spray head 9 is 50 percent of the inner diameter of a gun body spray pipe passing through the auxiliary spray head, because the 2 auxiliary spray heads 9 for spraying the magnesium particles are uniformly distributed in the three-dimensional space around the gun body 6, the magnesium particles sprayed out of the auxiliary spray heads 9 can be sprayed into the molten iron 8 in a larger range, the magnesium particles can be uniformly distributed into the molten iron 8, and the reaction speed of magnesium and sulfur is favorably improved.
When molten iron 8 needs to be desulfurized, a valve of a nitrogen gas storage source 1 is opened, a rotary multi-stage magnesium-spraying desulfurization gun is lowered into the molten iron 8, nitrogen gas is blown out from an auxiliary nozzle 9 and a main nozzle 10 in the lowering process to form positive pressure relative to the molten iron 8, the molten iron is prevented from flowing into a nozzle channel in the desulfurization gun to burn out a nozzle, the rotary multi-stage magnesium-spraying desulfurization gun stops lowering when the main nozzle 10 is lowered to a position 20cm away from the ladle bottom, a valve of a passivated magnesium storage tube is opened, and the desulfurization of passivated magnesium particles is started, during the magnesium particle blowing process, the spray gun performs self-rotation motion while blowing magnesium particles, the rotation speed is 5 revolutions per minute, the auxiliary nozzle 9 on the rotary gun body performs circular motion along with the gun body, so that the magnesium particles sprayed by the auxiliary nozzle 9 can be uniformly blown into a horizontal plane where the auxiliary nozzle 9 is located, because the horn-mouth-shaped auxiliary nozzle 9 extends out of the gun body 6 by about 300mm, during the self-rotation of the gun body 6, the auxiliary nozzle 9 can also play a role of stirring the molten iron 8 to promote the diffusion flow of magnesium in the molten iron, and improve the desulfurization reaction kinetics.
The gun body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer 15, a refractory material framework 14, a steel liner 13, an inner layer refractory material layer 12 and a spraying channel 11 from outside to inside along the inner diameter direction, wherein the outer layer refractory material layer 15 plays a role in resisting the erosion of molten iron 8 on the gun body 6; the refractory material framework 14 is formed by fixing transverse annular steel bars and longitudinal steel bars in a crossed manner to form a net shape, and is welded on the steel liner 13 to play a role in fixing the outer-layer refractory material 15; the steel liner 13 is a steel round tube and plays a role in supporting the gun 6; the inner layer refractory material layer 12 can resist the erosion of molten iron to the spray pipe and also can play a role in filling materials between the steel pipe and the spray pipe; the blowing channel 11 is a high-manganese wear-resistant steel pipe, and passivated magnesium particles and nitrogen are blown in the nozzle.
In the magnesium spraying desulfurization process, the weight of molten iron is as follows: 120 tons, the initial molten iron contains sulfur: 0.037%, and the magnesium spraying amount is as follows: 0.35 kg/ton molten iron, and the magnesium spraying time is as follows: and 7 minutes, detecting the sulfur content in the molten iron after desulfurization: 0.003 percent, and the utilization rate of magnesium grains is as follows: 72.8 percent, and obviously improves the desulfurization efficiency and the utilization rate of magnesium.
Examples 2,
Processing the rotary multi-stage magnesium-spraying desulfurization gun shown in figures 1, 2 and 3, wherein a gun body 6 of the rotary multi-stage magnesium-spraying desulfurization gun is connected with a nitrogen gas storage source 1 and a passivated magnesium storage tank 2 through a spraying hose 3, the gun body 6 of the spray gun is connected with the spraying hose 3 through a sealed bearing 4, the gun body 6 of the spray gun is also connected with a transmission mechanism 5, and the transmission mechanism 5 drives the rotary multi-stage magnesium-spraying desulfurization gun to do spinning motion in the magnesium-spraying desulfurization process.
The outer diameter of the magnesium-spraying desulfurization gun is 400mm, the inner diameter of a spraying channel 11 in the magnesium-spraying desulfurization gun is 20mm, the spray head at the bottommost part of the spray gun is a main spray head 10 in a horn mouth shape, 5 positions are additionally arranged on the gun body at the middle lower part of the spray gun except the spray head 10 at the bottommost part of the spray gun to form magnesium particle spraying points, an auxiliary spray head 9 for spraying magnesium particles is arranged on each magnesium particle spraying point, the 5 auxiliary spray heads 9 for spraying magnesium particles are arranged along the gun body 6 from top to bottom, the distance between every two auxiliary spray heads 9 is 100mm, the projections of the 5 auxiliary spray heads 9 for spraying magnesium particles at the bottom of the ladle 7 are 5 positions uniformly distributed on one circumference, and the auxiliary spray heads 9 are in a horn mouth shape and extend out of the gun body 6 by about 100mm; in order to ensure that magnesium particles can be smoothly sprayed out from the auxiliary nozzles 9, the inner diameter of the spraying channel 11 in the gun body 6 is obviously reduced at the auxiliary nozzles 9, from top to bottom, the inner diameter of the spraying channel 11 in the gun body 6 is reduced by 10 percent when the magnesium particles pass through one auxiliary nozzle 9, and the inner diameter of each auxiliary nozzle 9 is 20 percent of the inner diameter of the spraying channel in the gun body passing through the auxiliary nozzle at the position.
When molten iron 8 needs to be desulfurized, a valve of a nitrogen gas storage source 1 is opened 1, a rotary multi-stage magnesium-spraying desulfurization gun is lowered into the molten iron 8, nitrogen is blown out from an auxiliary nozzle 9 and a main nozzle 10 in the lowering process to form positive pressure relative to the molten iron 8, the nozzle is prevented from burning out when the molten iron flows into a blowing channel of the desulfurization gun, the rotary multi-stage magnesium-spraying desulfurization gun stops lowering when the main nozzle 10 is 30cm away from the ladle bottom, a valve of a passivated magnesium storage tube is opened, and the desulfurization of passivated magnesium particles starts to be blown, during the magnesium particle blowing process, the spray gun performs self-rotation motion while blowing magnesium particles, the rotation speed is 60 revolutions per minute, the auxiliary nozzle 9 on the rotary gun body performs circular motion along with the gun body, so that the magnesium particles sprayed by the auxiliary nozzle 9 can be uniformly blown into a horizontal plane where the auxiliary nozzle 9 is located, because the horn-mouth-shaped auxiliary nozzle 9 extends out of the gun body 6 by about 100mm, during the self-rotation motion of the gun body 6, the auxiliary nozzle 9 can also play a role of stirring the molten iron 8 to promote the diffusion flow of magnesium in the molten iron, and improve the desulfurization reaction kinetics.
The gun body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer 15, a refractory material framework 14, a steel liner 13, an inner layer refractory material layer 12 and a spray pipe 11 from outside to inside along the inner diameter direction, wherein the outer layer refractory material layer 15 plays a role in resisting the erosion of molten iron 8 on the gun body 6; the refractory material framework 14 is formed by fixing transverse annular steel bars and longitudinal steel bars in a crossed manner to form a net shape, and is welded on the steel liner 13 to play a role in fixing the outer-layer refractory material 15; the steel liner 13 is a steel round tube and plays a role in supporting the gun 6; the inner layer refractory material layer 12 can resist the erosion of molten iron to the spray pipe and also can play a role in filling materials between the steel pipe and the spray pipe; the blowing channel 11 is a high-manganese wear-resistant steel pipe, and passivation magnesium grains and nitrogen are blown in the nozzle.
In the magnesium spraying desulfurization process, the weight of molten iron is as follows: 120 tons, the sulfur content in the initial molten iron is: 0.045%, and the magnesium spraying amount is as follows: 0.4 kg/ton molten iron, and the magnesium spraying time is as follows: and 6 minutes, detecting the sulfur content in the molten iron after desulfurization: 0.002%, the utilization rate of magnesium grains is: 80.6 percent, and obviously improves the desulfurization efficiency and the utilization rate of magnesium.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A desulfurization spray gun, includes the body of a gun, its characterized in that:
the gun body is provided with a main spray head and a plurality of auxiliary spray heads, the main spray head is arranged at the bottommost part of the gun body, the auxiliary spray heads are dispersedly arranged at the middle lower part of the gun body, a blowing channel is arranged in the gun body, and the main spray head and the auxiliary spray heads are connected with the blowing channel; the auxiliary spray head is in a bell mouth shape; the auxiliary spray head extends out of the gun body by 100-300mm; the distance between the adjacent auxiliary spray heads is 100-300mm; the auxiliary spray heads are uniformly or non-uniformly distributed in the vertical direction, and a certain distance is kept between the spray heads; the projections of the auxiliary nozzles in the radial direction of the spray gun or at the bottom of the ladle are uniformly distributed on a circumference;
the desulfurization spray gun is connected with the sealing bearing and is driven to rotate through a transmission mechanism.
2. The lance defined in claim 1 wherein the main lance is bell mouth shaped.
3. The desulfurization lance defined in claim 1 wherein the blow passage is tapered in the blow direction and has a reduced inner diameter for each passage through one of the sub-ports.
4. The lance defined in claim 3 wherein the internal diameter of the lance passage is reduced by 10-20% at the secondary nozzle.
5. The desulfurization spray gun of claim 1, wherein the gun body and the spray head of the spray gun are sequentially provided with an outer layer refractory material layer, a refractory material framework, a steel liner, an inner layer refractory material layer and a blowing channel from outside to inside along the inner diameter direction.
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| CN108339678B (en) * | 2018-03-02 | 2020-12-01 | 义乌市航英科技有限公司 | Rotary electric spray gun for plastic spraying |
| WO2021229263A1 (en) * | 2020-05-11 | 2021-11-18 | Arcelormittal | Stirring method of liquid metal and associated device |
| CN114058764A (en) * | 2021-11-17 | 2022-02-18 | 辽宁科技大学 | Rotary blowing device for molten iron desulphurization |
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| JP4830825B2 (en) * | 2006-12-05 | 2011-12-07 | Ｊｆｅスチール株式会社 | Refining method in converter type refining furnace |
| CN202415603U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Double channel molten iron desulfurization spray gun |
| CN202808862U (en) * | 2012-09-10 | 2013-03-20 | 攀钢集团西昌钢钒有限公司 | Desulfuration spray gun |
| CN104060014A (en) * | 2013-09-27 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization spray gun and desulfurization method |
| CN105219909B (en) * | 2015-10-20 | 2017-11-17 | 武汉钢铁有限公司 | Molten iron desulfuring spray gun is directly blown for magnesium desulfurizer |
| CN207227470U (en) * | 2017-05-12 | 2018-04-13 | 山东钢铁股份有限公司 | A kind of desulfuring spray gun |
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