CN107299192B - Refining rotary blowing deoxidation device and deoxidation method - Google Patents
Refining rotary blowing deoxidation device and deoxidation method Download PDFInfo
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Abstract
The invention discloses a deoxidizing device and a deoxidizing method for refining rotary blowing, wherein a deoxidizing agent is conveyed into molten steel, and compared with the conventional molten steel deoxidizing and deoxidizing agent feeding modes, in the deoxidizing device, the deoxidizing agent floats to the liquid level along a spiral line under the combined action of centrifugal force and buoyancy force along with micro bubblesThe floating body moves towards the powder spraying direction area under the action of centrifugal force, so that the deoxidizer is better dispersed in the molten steel, and simultaneously, a vortex is formed in the molten steel and slowly rises, thereby increasing the retention time of the deoxidizer in the molten steel, improving the kinetic condition of deoxidation in the molten steel, and promoting Al in the molten steel2O3The inclusions collide with other fine particles, are gathered and grow up, and dispersed bubbles float upwards along with the inclusions, so that the purity of the molten steel and the utilization rate of the deoxidizer are improved.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a refining rotary blowing deoxidation device and a deoxidation method.
Background
Cleaning is the main trend of modern steel material development, and clean steel production is the important direction of modern steel smelting technology development. O, P, S, H the deep processing problem of four major impurity elements is always the main contradiction and obstacle between steel purification and cost in the production process of various steels. Conventional processing means rely mainly on vacuum (RH, VD) and electrodes (LF). However, the method has expensive equipment cost and high use and maintenance cost, the cost of one process is 30-60 yuan/t even if the process is light, and particularly the upgrading and efficiency improvement are more important on the premise that the market price competition is extremely strong.
Different reducing agents and reducing processes are adopted, and the method plays a key role in deoxidation, desulfurization, alloying and improvement of the purity of the molten steel. Especially, the research on the composite deoxidizer and the deoxidation process explores that the deoxidizer can not only fully deoxidize the oxidizing molten steel, but also effectively remove deoxidation inclusions. The disadvantages of the addition of deoxidizer to the ladle are: the mass transfer speed of the slag steel interface is slow, the deoxidation time is long, and the productivity is reduced. When the conventional deoxidation method is applied to low-carbon steel with the carbon content lower than 0.10%, the problems that the casting blank generates subcutaneous bubbles due to poor deoxidation or nozzle nodulation and casting blank inclusion increase due to non-metallic inclusions and the like easily occur. The deoxidation degree of the molten steel directly influences the quantity of oxide inclusions in the steel, and further influences the mechanical properties of the steel.
The publication No. CN201210269403.7 proposes a molten steel deoxidation modifier, the component of which is Al2O3、Al、CaCO3、NaCO3、BaCO3Mixture of equal composition, wherein CaCO3The proportion of the deoxidizer is more than 60 percent, the deoxidizer is put into a steel ladle in the process of refining the molten steel, and the mixture is utilized to generate useful gas and fine dispersed particles in the molten steel, so that the molten steel is promoted to deoxidize rapidly. However, the method directly adds the deoxidizer into the molten steel, has poor control on the dynamic conditions of the deoxidation reaction, and ensures that the deoxidation powder is not easy to diffuse in the molten steel, so that the utilization rate of the powder is lower and the production cost is higher.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a refining rotary blowing deoxidation device and a deoxidation method, and solve the problems that in the conventional molten steel deoxidation process, a deoxidizer is not easy to diffuse, the utilization rate is low, and deoxidation products are not easy to float upwards and remove.
The purpose of the invention is realized by the following technical scheme:
a deoxidation device for refining rotary blowing comprises a lifting device, an air supply system, a feeding system, a rotary joint, a rotary device, a rotary horizontal gun, a T-shaped stirring head, a hollow rotary pipe and a frame; the gun body of the rotary horizontal gun is a hollow tube, the gun head is a T-shaped stirring head, blowing holes are formed in two sides of the T-shaped stirring head, and the gun body and the T-shaped stirring head are wrapped with refractory materials; the rotating device comprises a motor and a hollow shaft therein; the rotary horizontal gun is connected with the lower part of the rotary device, and the gun body is connected with the hollow shaft through a flange; the upper part of the rotating device is connected with the lower part of the hollow rotating pipe, and the hollow shaft is connected with the lower part of the hollow rotating pipe through a flange; the upper part of the hollow rotating pipe is connected with a bearing in the rotating joint; the rotary joint is communicated with the gas supply system and the charging system; the rotary joint is fixed with the frame; the rotating device is fixed in the frame, and the upper end of the frame is connected with the lifting device; the lifting device comprises a winch, a fixed pulley, a lifting hook, a support frame, a guide ring arranged on one side of the frame and a guide rod matched with the guide ring; the winch, the fixed pulley and the guide rod are fixed on the support frame; the lifting hook is connected with the frame through a steel wire rope.
The total length of the rotary transverse gun is 4500-.
The deoxidation method for refining rotary blowing comprises the following steps:
1) the tapping temperature of the converter is controlled at 1550-1650 ℃;
2) the rotary horizontal gun starts to descend from a standby position through the lifting device, and simultaneously opens the air supply system and the charging system to start spraying the deoxidizing powder;
3) the T-shaped stirring head of the rotary transverse gun enters the position below the liquid level of molten steel and is 0.3-1m away from the bottom of the molten steel ladle, then the T-shaped stirring head stops descending, a rotating device is started, the rotating speed is gradually increased, and the rotating speed of the T-shaped stirring head is set to be 5-300 r/min;
4) after rotating and blowing for 5-10min, starting to lift the rotating cross lance through a lifting device, reducing the rotating speed to 5-10r/min before a T-shaped stirring head of the rotating cross lance lifts the liquid level of the molten steel, lifting the liquid level of the molten steel for 0.3-0.5m, keeping the position, accelerating the rotation for 10-30s again, and controlling the rotating speed to be 50-80 r/min;
5) and reducing the revolution of the rotating device until the revolution is stopped, closing the gas supply system and the charging system, finishing the blowing and finishing the deoxidation process of the rotary blowing.
Step 1), controlling the carbon content in molten steel tapped from a converter to be below 0.10% by mass;
the carrier gas flow of the gas supply system is 10-60Nm3The carrier gas pressure is 0.3-1.5MPa, and the carrier gas is Ar gas;
the conveying capacity of the charging system to the deoxidizing powder is 5-10 kg/t;
the deoxidizing powder contains Al in percentage by mass2O320-40％、Al40-60％、CaCO310-30% and the granularity is 0.05-0.1 mm.
The refining rotary blowing desulfurization device is applied to the working procedures of LF, argon station, RH, ANS, VD and the like of molten steel refining, and can also be independently applied to the refining desulfurization working procedure.
The deoxidizing device and the deoxidizing method of the refining rotary blowing of the invention convey the deoxidizing agent to the inside of the molten steel, compared with the conventional molten steel deoxidizing and deoxidizing agent feeding modes, in the invention, the deoxidizing agent floats to the liquid surface along a spiral line under the combined action of centrifugal force and upper buoyancy along with micro bubbles, and the bubbles move to the powder spraying direction area under the action of the centrifugal force, so that the deoxidizing agent is better dispersed in the molten steel, and meanwhile, a vortex is formed in the molten steel to slowly rise, thereby increasing the retention time of the deoxidizing agent in the molten steel, improving the dynamic condition of the deoxidizing in the molten steel, and promoting Al in the molten steel2O3The inclusions collide with other fine particles, are gathered and grow up, and dispersed bubbles float upwards along with the inclusions, so that the purity of the molten steel and the utilization rate of the deoxidizer are improved.
Drawings
FIG. 1 is a schematic view of a refining rotary blowing deoxidation apparatus;
wherein, 1-a lifting device; 2-a gas supply system; 3-a charging system; 4-a rotary joint; 5-a rotating device; 6-a guide ring; 7-rotating a horizontal gun; 8-steel ladle; 9-T-shaped stirring head; 10-a hollow rotating tube; 11-a frame; 12-a support frame; 13-guide bar.
Detailed Description
The following description is given with reference to specific examples:
a deoxidation device for refining rotary blowing comprises a lifting device 1, an air supply system 2, a charging system 3, a rotary joint 4, a rotary device 5, a guide ring 6, a rotary horizontal lance 7, a ladle 8, a T-shaped stirring head 9, a hollow rotary pipe 10, a frame 11, a support frame 12 and a guide rod 13;
the body of the rotary horizontal lance 7 is a hollow tube, the head of the rotary horizontal lance is a T-shaped stirring head, blowing holes are formed in two sides of the T-shaped stirring head, and the body of the rotary horizontal lance and the T-shaped stirring head are wrapped with refractory materials; the rotating device 5 comprises a motor and a hollow shaft therein; the rotary horizontal gun 7 is connected with the lower part of the rotary device 5, and the gun body is connected with the hollow shaft through a flange; the upper part of the rotating device 5 is connected with the lower part of the hollow rotating pipe 10, and the hollow shaft is connected with the lower part of the hollow rotating pipe 10 through a flange; the upper part of the hollow rotating pipe 10 is connected with a bearing in the rotating joint 4; the rotary joint 4 is communicated with the gas supply system 2 and the charging system 3; the rotary joint 4 is fixed with the frame 11; the rotating device 5 is fixed in a frame 11, and the frame 11 is connected with the lifting device 1.
The lifting device 1 comprises a winch, a fixed pulley, a lifting hook, a support frame 12, a guide ring 6 arranged on one side of the frame 11 and a guide rod 13 matched with the guide ring 6; the winch, the fixed pulley and the guide rod 13 are fixed on the support frame 12, and the lifting hook is connected with the upper end of the frame 11 through a steel wire rope.
Example one
1. The embodiment of the invention is carried out on 260t molten steel tank for producing low-carbon aluminum killed steel, the tapping temperature of the converter for implementing steel grade is 1640 ℃, and the carbon content is 0.06%.
2. And conveying the ladle to a rotary blowing deoxidation process, and refining and deoxidizing the molten steel by using a deoxidation device for refining rotary blowing.
3. The total length of a rotary transverse gun of the rotary blowing deoxidation device is 4600mm, the length of a stirring head is 900mm, the diameter of the stirring head is 360mm, the diameter of a blowing hole is 9mm, the diameter of a hollow pipe is 170mm, and the insertion depth is 0.5m from the bottom of the rotary transverse gun T-shaped stirring head to the bottom of the tank.
4. Blowing deoxidizer by using carrier gas with the carrier gas flow of 20Nm3The carrier gas pressure is 1.2MPa, and the carrier gas is Ar gas.
5. The main component Al of the deoxidizing powder used2O335％、Al45％、CaCO315 percent. The particle size of the deoxidizer was 0.07mm, and the conveying amount of the deoxidizer was 10 kg/t.
6. The deoxidation steps of molten steel refining and rotary blowing are as follows: 1) after receiving a working instruction, the rotary horizontal lance starts to descend from a standby position, and simultaneously opens the high-pressure gas source and the feeding system to start powder spraying. 2) After the rotating cross lance enters the position below the liquid level of molten steel and is 0.5m away from the bottom of the molten steel tank, the rotating speed is gradually increased and is set to be 90 r/min. 3) And starting to lift the lance after the blowing operation reaches 9min, reducing the rotating speed to be below 5r/min before lifting the liquid level of the molten steel at the front end of the rotary transverse lance, lifting the liquid level of the molten steel by 0.3m, keeping the position, and accelerating the rotation for 20s again, wherein the rotating speed is 50 r/min. 4) And reducing the rotation number until the rotation is stopped, and ending the blowing to complete the deoxidation process of the rotation blowing.
7. The active oxygen content before steel grade refining is 0.034%, the total oxygen content after rotary blowing deoxidation process is 0.0015%, the temperature drop is 20 ℃, and the deoxidation effect is obvious.
Example two
1. The embodiment of the invention is carried out on a 260t molten steel tank and is used for producing low alloy steel, the converter tapping temperature of the steel grade is 1630 ℃, and the carbon content is 0.03%.
2. And conveying the ladle to a rotary blowing deoxidation process, and refining and deoxidizing the molten steel by using a deoxidation device for refining rotary blowing.
3. The total length of a rotary transverse gun of the rotary blowing deoxidation device is 4600mm, the length of a stirring head is 900mm, the diameter of the stirring head is 360mm, the diameter of a blowing hole is 9mm, the diameter of a hollow pipe is 170mm, and the insertion depth is 0.5m from the bottom of the rotary transverse gun T-shaped stirring head to the bottom of the tank.
4. Blowing deoxidizer by using carrier gas with the carrier gas flow of 20Nm3The carrier gas pressure is 1.2MPa, and the carrier gas is Ar gas.
5. The main component Al of the deoxidizing powder used2O330％、Al40％、CaCO320 percent. The particle size of the deoxidizer was 0.07mm, and the conveying amount of the deoxidizer was 10 kg/t.
6. The deoxidation steps of molten steel refining and rotary blowing are as follows: 1) after receiving a working instruction, the rotary horizontal lance starts to descend from a standby position, and simultaneously opens the high-pressure gas source and the feeding system to start powder spraying. 2) After the rotating lance enters the position below the liquid level of molten steel and is 0.5m away from the bottom of the molten steel pot, the rotating speed is gradually increased and is set to be 50 r/min. 3) And starting to lift the lance after the blowing operation reaches 8min, reducing the rotating speed to be below 5r/min before lifting the liquid level at the front end of the rotary transverse lance, lifting the liquid level of the molten steel by 0.3m, keeping the position, and accelerating the rotation for 20s again, wherein the rotating speed is 50 r/min. 4) And reducing the rotation number until the rotation is stopped, and ending the blowing to complete the deoxidation process of the rotation blowing.
7. The active oxygen content before steel grade refining is 0.043%, the total oxygen content after rotary blowing deoxidation process is 0.0016%, and the temperature drop is 18 ℃.
EXAMPLE III
1. The embodiment of the invention is carried out on a 260t molten steel tank for producing IF steel, the tapping temperature of a converter for implementing steel grade is 1635 ℃, and the carbon content is 0.002%.
2. And conveying the ladle to a rotary blowing deoxidation process, and refining and deoxidizing the molten steel by using a deoxidation device for refining rotary blowing.
3. The total length of a rotary horizontal lance of the rotary blowing deoxidation device is 4700mm, the length of a stirring head is 950mm, the diameter of the stirring head is 370mm, the diameter of a blowing hole is 9mm, the diameter of a hollow pipe is 180mm, and the insertion depth is 0.5m from the bottom of the rotary horizontal lance T-shaped stirring head to the bottom of a tank.
4. Blowing deoxidizer by using carrier gas with the carrier gas flow of 20Nm3The carrier gas pressure is 1.2MPa, and the carrier gas is Ar gas.
5. The main component Al of the deoxidizing powder used2O335％、Al50％、CaCO310 percent. The particle size of the deoxidizer was 0.07mm, and the conveying amount of the deoxidizer was 13 kg/t.
6. The deoxidation steps of molten steel refining and rotary blowing are as follows: 1) after receiving a working instruction, the rotary horizontal lance starts to descend from a standby position, and simultaneously opens the high-pressure gas source and the feeding system to start powder spraying. 2) After the rotating cross lance enters the position below the liquid level of molten steel and is 0.5m away from the bottom of the molten steel tank, the rotating speed is gradually increased and is set to be 160 r/min. 3) And starting to lift the lance after the blowing operation reaches 9min, reducing the rotating speed to be below 5r/min before lifting the liquid level of the molten steel at the front end of the rotary transverse lance, lifting the liquid level of the molten steel by 0.3m, keeping the position, and accelerating the rotation for 20s again, wherein the rotating speed is 50 r/min. 4) And reducing the rotation number until the rotation is stopped, and ending the blowing to complete the deoxidation process of the rotation blowing.
7. The active oxygen content before steel grade refining is 0.032%, the total oxygen content after rotary blowing deoxidation process is 0.0013%, and the temperature is reduced to 25 ℃.
Comparative example
The low-carbon aluminum killed steel is produced by applying a conventional fixed cylindrical spray gun on a molten steel tank of 260t, the tapping temperature of a converter for implementing steel grades is 1635 ℃, the carbon content is 0.06%, the active oxygen content is 0.042%, the distance from the bottom of the fixed cylindrical spray gun to the bottom of the tank is 0.5m, a carrier gas is used for blowing a deoxidizer, and the carrier gas flow is 20Nm3The carrier gas pressure is 1.2MPa, and the carrier gas is Ar. The deoxidizing powder used is Al2O335％、Al45％、CaCO315%, etc. The granularity of the deoxidizer is 0.07mm, the conveying amount of the deoxidizer is 10kg/t, and the treatment time is 20 min. The molten steel is obviously splashed in the treatment process, the total oxygen content is 0.0024 percent after the rotary blowing treatment, and the temperature is reduced to 32 ℃.
The method of the invention is used for molten steel refining deoxidation, improves the dynamic condition of deoxidation in molten steel, and promotes Al in molten steel2O3The inclusion collides with other fine particles, is aggregated and grows, and dispersed bubbles fully float upwards along with the inclusion, so that compared with the conventional refining and blowing deoxidizer, the total oxygen content is reduced by 30 percent after the treatment is finished, the purity of the molten steel and the utilization rate of the deoxidizer are improved, the treatment time is shortened by 25 percent, the temperature drop is reduced by 20 percent, and the molten steel splashing is effectively inhibited. The invention can be independently used as a molten steel refining and deoxidizing process, and can also be applied to processes of LF, argon station, RH, ANS, VD and the like in molten steel refining.
Claims (3)
1. A deoxidation method of a refining rotary blowing deoxidation device is characterized in that: the deoxidation device comprises a lifting device, an air supply system, a feeding system, a rotary joint, a rotary device, a rotary horizontal gun, a T-shaped stirring head, a hollow rotary pipe and a frame; the gun body of the rotary horizontal gun is a hollow tube, the gun head is a T-shaped stirring head, the two sides of the T-shaped stirring head are provided with blowing holes with the diameter of 10-20mm, and the gun body and the T-shaped stirring head are wrapped with refractory materials; the rotating device comprises a motor and a hollow shaft therein; the rotary horizontal gun is connected with the lower part of the rotary device, and the gun body is connected with the hollow shaft through a flange; the upper part of the rotating device is connected with the lower part of the hollow rotating pipe and is hollowThe shaft is connected with the lower part of the hollow rotating pipe through a flange; the upper part of the hollow rotating pipe is connected with a bearing in the rotating joint; the rotary joint is communicated with the gas supply system and the charging system; the rotary joint is fixed with the frame; the rotating device is fixed in the frame, and the upper end of the frame is connected with the lifting device; the lifting device comprises a winch, a fixed pulley, a lifting hook, a support frame, a guide ring arranged on one side of the frame and a guide rod matched with the guide ring; the winch, the fixed pulley and the guide rod are fixed on the support frame; the lifting hook is connected with the frame through a steel wire rope; the method comprises the following steps: 1) the tapping temperature of the converter is controlled at 1550-1650 ℃; 2) the rotary horizontal gun starts to descend from a standby position through the lifting device, and simultaneously opens the air supply system and the charging system to start spraying the deoxidizing powder; 3) the T-shaped stirring head of the rotary transverse gun enters the position below the liquid level of molten steel and is 0.3-1m away from the bottom of the molten steel ladle, then the T-shaped stirring head stops descending, a rotating device is started, the rotating speed is gradually increased, and the rotating speed of the T-shaped stirring head is set to be 90-300 r/min; 4) after rotating and blowing for 5-10min, starting to lift the rotating cross lance through a lifting device, reducing the rotating speed to 5-10r/min before a T-shaped stirring head of the rotating cross lance lifts the liquid level of the molten steel, lifting the liquid level of the molten steel for 0.3-0.5m, keeping the position, accelerating the rotation for 10-30s again, and controlling the rotating speed to be 50-80 r/min; 5) reducing the revolution of the rotating device to stop, closing the gas supply system and the charging system, ending the blowing and completing the deoxidation process of the rotating blowing; step 1), controlling the carbon content in molten steel tapped from a converter to be below 0.10% by mass; the carrier gas flow of the gas supply system is 10-60Nm3H, the pressure of carrier gas is 0.3-1.5MPa, and the carrier gas is Ar gas; the conveying amount of the charging system to the deoxidizing powder is 5-10 kg/t.
2. The deoxidation method of the refining rotary blowing deoxidation apparatus according to claim 1, characterized in that: the total length of the rotary transverse gun is 4500-.
3. The deoxidation method of the refining rotary blowing deoxidation apparatus according to claim 1, characterized in that: the deoxidizing powder contains Al in percentage by mass2O320-40％、Al40-60％、CaCO310-30% and the granularity is 0.05-0.1 mm.
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| CN107119172B (en) * | 2017-04-24 | 2020-06-23 | 鞍钢股份有限公司 | Refining rotary blowing desulfurization device and desulfurization method |
| CN108754074B (en) * | 2018-09-06 | 2019-06-07 | 东北大学 | The device and method being mingled with is removed in a kind of blowing coupling of mechanical stirring |
| CN109504822A (en) * | 2018-12-05 | 2019-03-22 | 鞍钢股份有限公司 | A kind of RH refining rotating injecting powder device and method of deoxidation |
| CN115505667B (en) * | 2022-09-19 | 2023-09-15 | 首钢集团有限公司 | KR powder spraying molten iron pretreatment method |
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| CN102747190A (en) * | 2012-07-30 | 2012-10-24 | 重庆钢铁(集团)有限责任公司 | Deoxygenation modifier for molten steel |
| CN203096107U (en) * | 2013-02-07 | 2013-07-31 | 武汉钢铁(集团)公司 | Blowing desulfurization spray gun for torpedo ladle |
| CN106086312A (en) * | 2016-07-07 | 2016-11-09 | 中冶南方工程技术有限公司 | A kind of Desulfuring Device of Hot Metal and method |
| CN107190122B (en) * | 2017-04-24 | 2020-03-31 | 鞍钢股份有限公司 | Dephosphorization device and dephosphorization method for refining rotary blowing |
| CN107119172B (en) * | 2017-04-24 | 2020-06-23 | 鞍钢股份有限公司 | Refining rotary blowing desulfurization device and desulfurization method |
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