CN103589823B - Integration ladle refining equipment and method for making steel - Google Patents
Integration ladle refining equipment and method for making steel Download PDFInfo
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- CN103589823B CN103589823B CN201310639698.7A CN201310639698A CN103589823B CN 103589823 B CN103589823 B CN 103589823B CN 201310639698 A CN201310639698 A CN 201310639698A CN 103589823 B CN103589823 B CN 103589823B
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Abstract
The invention discloses a kind of integrated ladle refining equipment, comprise ladle, the first steel ladle cover for LF refining and the second steel ladle cover for VOD refining, ladle bottom connects ladle seat, and ladle side arranges the first rotating mechanism and the first hoisting appliance; Ladle opposite side arranges the second rotating mechanism and the second hoisting appliance.This refining unit completes whole refining processs of LF refining and VOD refining by an equipment; The invention also discloses a kind of method for making steel adopting integrated ladle refining equipment, comprising: water of just making steel loads ladle; The first steel ladle cover is made to be connected to above ladle; LF refining is carried out to the molten steel in ladle; Adjusting the first hoisting appliance and the first rotating mechanism makes the first steel ladle cover depart from ladle, makes the second steel ladle cover be connected to above ladle; VOD refining is carried out to the molten steel in ladle.This method for making steel first carries out LF refining and VOD refining, shortens refining time greatly, improves the refined quality of molten steel.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to a kind of integrated ladle refining furnace equipment and method for making steel.
Background technology
The melting 80% of the casting of current domestic and international little tonnage steel part, forging and special steel all adopts medium frequency induction melting furnace.Defect due to medium frequency induction melting furnace self: 1, starting material need selected, can not adjust kind and the composition of smelting steel; 2, pouring temperature is low; 3, cannot slag refining, oxygen decarburization, Argon stir, vacuum outgas and adjusting component.Cause quality product cannot up to standard, cannot improve, cannot ensure, multi items steel can not be produced by product requirement.
Through the molten steel of medium frequency induction melting furnace melting, its molten steel top temperature is 1650 DEG C, through casting ladle, be transported to casting time temperature about 1550 DEG C.For different steel grade, varying environment is wished ladle molten steel insulation, is heated up, to meet the teeming temperature of each variety steel.For the molten steel of more than 20t, be all generally adopt LF ladle refining furnace electric-arc heating, improve liquid steel temperature.And for the little tonnage molten steel of 3t ~ 15t, ladle is little, volume is little, molten steel cools speed is fast, electric-arc heating intensification tool is adopted to acquire a certain degree of difficulty, the molten steel insulation of little tonnage LF ladle refining furnace anxious to be resolved and intensification problem.In medium frequency induction melting furnace fusing whole process, although electromagnetic induction coil has stirring action to molten steel, run the ideal effect not reaching and stir in ladle bottom Argon.Stirred by Argon, the gas of molten steel inside (oxygen, hydrogen, nitrogen) and the eliminating of slag thing could be added, molten steel is purified.Medium frequency induction melting furnace is body of heater topples over, and is cast by the tap hole on ladle top.Cannot implement, without slag casting, therefore cannot ensure that being mingled with gas content of steel part is up to standard, need to solve without slag casting problem.Slag charge cannot be added during medium frequency induction melting furnace steel and carry out refining, the oxygen in molten steel, hydrogen, nitrogen, sulphur and Slag inclusion cannot be removed.Add slag refining by LF stove, oxygen and the non-metallic inclusion sulphur of about 10ppm can be removed.For special steel, the oxygen level of steel and carbon content have strict requirement, must reach required value through vacuum outgas and vacuum oxygen.And medium frequency induction melting furnace not possesses above condition.Big-and-middle-sized Special Steel Works for more than 20t tonnage has all been come by independently VOD refining furnace.And little tonnage, especially 1 ~ 6t due to molten steel volume little, molten steel cools speed is fast, for VOD vacuum oxygen refining, there is certain difficulty.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of integrated ladle refining equipment is provided.This integrated ladle refining equipment can complete whole refining processs of LF refining and VOD refining by a set of equipment, with medium frequency induction melting furnace with the use of to improve medium frequency induction melting furnace result of use, can mainly be applicable to the steel-making of little tonnage.
For achieving the above object, the technical solution used in the present invention is: integrated ladle refining equipment, it is characterized in that: comprise ladle, the first steel ladle cover carrying out LF refining for matching with ladle and for the second steel ladle cover carrying out VOD refining that matches with ladle, the bottom of described ladle is connected with the ladle seat for supporting ladle, the first hoisting appliance that the side of described ladle is provided with the first rotating mechanism for driving the first steel ladle cover to be connected with ladle or to depart from and drives the first steel ladle cover to be elevated; The second hoisting appliance that the opposite side of described ladle is provided with the second rotating mechanism for driving the second steel ladle cover to be connected with ladle or to depart from and drives the second steel ladle cover to be elevated.
Above-mentioned integrated ladle refining equipment, is characterized in that: the upper opening of described ladle is up-small and down-big taper; The bottom of described ladle is connected with Argon pipe.
Above-mentioned integrated ladle refining equipment, is characterized in that: be provided with pushing off the slag lid in described second steel ladle cover, in described second steel ladle cover and the top being positioned at pushing off the slag lid is provided with water-cooled screening cover.
Above-mentioned integrated ladle refining equipment, is characterized in that: described second steel ladle cover is provided with vacuum feeding device; Described vacuum feeding device comprises receiving hopper and is arranged on the vacuum hopper be communicated with below receiving hopper and with receiving hopper, described vacuum hopper is connected with the second steel ladle cover, the outlet of described receiving hopper is provided with the first sealing member, the outlet of described vacuum hopper is provided with the second sealing member, the first cylinder for driving the first sealing member lifting is set in described receiving hopper, being provided with the second cylinder for driving the second sealing member lifting in described vacuum hopper, described vacuum hopper being connected with the Vacuum Balance pipe for being communicated with ladle.
Above-mentioned integrated ladle refining equipment, it is characterized in that: described ladle seat is the hollow structure of inner hollow and upper opening, the described upper opening of ladle seat is connected with the sealed bottom of ladle, the sidewall of described ladle seat offers the outlet of safe bleed-out, described safe bleed-out outlet is provided with the lid being easy to be melted by molten steel, and the side of described ladle seat is provided with and exports corresponding molten steel splendid attire dish with described safe bleed-out.
Above-mentioned integrated ladle refining equipment, is characterized in that: comprise the vacuum extractor for vacuumizing process to ladle and ladle seat; Described vacuum extractor comprises the first valve tube, the second valve tube, the 3rd valve tube and the 4th valve tube, described first valve tube one end is connected with vacuum pump, described second valve tube is connected with the first valve tube, the second steel ladle cover is stretched in one end of described 3rd valve tube, the other end of described 3rd valve tube is communicated with the second valve tube or disconnects under the drive of the second rotating mechanism, and described 3rd valve tube is made up of corrugated expansion joint; One end of described 4th valve tube is connected with the first valve tube, and the other end of described 4th valve tube stretches into ladle seat inside.
Above-mentioned integrated ladle refining equipment, it is characterized in that: described second steel ladle cover is provided with the oxygen rifle stretching into the second steel ladle cover inside and oxygen lance lifting device, described oxygen lance lifting device comprises the guidepost be vertically arranged on the second steel ladle cover and the sliding support be arranged on guidepost, and the oxygen lance lifting driving mechanism for driving sliding support to move up and down along guidepost, described oxygen rifle is arranged on sliding support.
Above-mentioned integrated ladle refining equipment, it is characterized in that: described first rotating mechanism is provided with the electrode for stretching into the first steel ladle cover and electrode lifting device, described electrode lifting device comprises the transverse arm for holding electrode and the transverse arm pillar stiffener for fixing transverse arm, is provided with the rise fall of electrodes driving mechanism for driving transverse arm pillar stiffener to move up and down along the first rotating mechanism below described transverse arm pillar stiffener.
Present invention also offers a kind of method for making steel adopting integrated ladle refining equipment, it is characterized in that, comprise the following steps:
Step one, load the step of ladle by just making steel water;
Step 2, the first steel ladle cover is made to be connected to step above ladle by adjustment first hoisting appliance and the first rotating mechanism;
Step 3, the step of LF refining that the molten steel in ladle is carried out;
Step 4, to be made by adjustment first hoisting appliance and the first rotating mechanism the first steel ladle cover depart from ladle, and make the second steel ladle cover be connected to step above ladle by adjustment second hoisting appliance and the second rotating mechanism;
Step 5, the step of VOD refining that the molten steel in ladle is carried out.
Above-mentioned method for making steel, is characterized in that, described step 5 comprises adds alloy raw material to adjust the vacuum charging step of alloying constituent in ladle, and described vacuum charging step comprises:
Step 501, the step of alloy raw material of adding in receiving hopper;
Step 502, open receiving hopper outlet the first sealing member, close the second sealing member, make alloy raw material enter the step of vacuum hopper from receiving hopper;
Step 503, close described first sealing member, by Vacuum Balance pipe, vacuum hopper is communicated with ladle, realizes the step that vacuum hopper is identical with ladle vacuum tightness;
Step 504, open vacuum hopper outlet the second sealing member, make alloy raw material enter the second steel ladle cover from vacuum hopper and then fall into the step of ladle.
The present invention compared with prior art has the following advantages:
1, the structure of the present invention's integration ladle refining equipment is simple, rationally novel in design, is easy to install.
2, the present invention's integration ladle refining equipment is in place motionless on ladle seat by described ladle, only by the first steel ladle cover and the second steel ladle cover order lift, rotate and match with ladle and then LF refining and VOD refining are switched, complete whole refining processs of LF refining and VOD refining, this integration apparatus cost is low, easy to use.
3, the present invention's integration ladle refining equipment is by being designed to up-small and down-big taper by described ladle upper opening, the particular design of ladle upper opening, reduces the area of dissipation of ladle upper opening, thus improves the heat insulation effect of ladle.
4, the present invention's integration ladle refining equipment is by arranging vacuum feeding device, when VOD refining, and when carrying out reinforced by making vacuum hopper consistent with the vacuum tightness of ladle, thus conveniently the second sealing member is opened, due to the shock action of the pressure sell of one's property life when can also prevent from feeding in raw material to ladle.
5, method for making steel of the present invention first carries out LF refining and VOD refining, shortens refining time greatly, improves the refined quality of molten steel.
In sum, the present invention's integration ladle refining equipment and method for making steel, when supporting the use with medium frequency induction melting furnace, greatly improve medium frequency induction melting furnace result of use, improve all drawbacks that medium frequency induction melting furnace in use exists greatly, avoid simultaneously medium frequency induction melting furnace cannot with large-scale LF refining furnace and the matching used defect of VOD refining furnace.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention when LF refining.
Fig. 2 is the structural representation of the present invention when VOD refining.
Fig. 3 is the annexation schematic diagram of vacuum feeding device of the present invention and the second steel ladle cover.
Fig. 4 is the structural representation of oxygen lance lifting device of the present invention.
Description of reference numerals:
1-the second steel ladle cover; 2-oxygen rifle; 3-oxygen lance lifting device;
3-1-sliding support; 3-2-guidepost; 3-3-driving chain;
3-4-drive sprocket; 3-5-driven sprocket; 4-vacuum feeding device;
4-1-receiving hopper; 4-2-vacuum hopper; 4-3-the first cylinder;
4-4-the second cylinder; 4-5-the first sealing member; 4-6-the second sealing member;
5-the second rotating mechanism; 5-1-rotating bearing support; 5-2-drive-motor;
5-3-driving toothed gear; 5-4-follower gear; 5-5-rotating base;
5-6-the second column bracket; 6-the first steel ladle cover; 7-vacuum extractor;
7-1-the first valve tube; 7-2-the second valve tube; 7-3-the 3rd valve tube;
7-4-the 4th valve tube; 8-ladle seat; 9-lid;
10-ladle; 11-the first rotating mechanism; 12-the first hoisting appliance;
13-furnace transformer; 14-short net; 15-electrode;
16-electrode lifting device; 16-1-transverse arm; 16-2-transverse arm pillar stiffener;
16-3-pillar stiffener hoist cylinder; 17-Argon pipe; 18-water-cooled screening cover;
19-pushing off the slag lid; 20-gas permeable brick; 21-slide gate nozzle;
22-add cinder notch; 23-molten steel splendid attire dish; 24-manual observation mouth;
25-the second hoisting appliance.
Embodiment
One integration ladle refining equipment as depicted in figs. 1 and 2, comprise ladle 10, the first steel ladle cover 6 carrying out LF refining for matching with ladle 10 and for the second steel ladle cover 1 carrying out VOD refining that matches with ladle 10, the bottom of described ladle 10 is connected with the ladle seat 8 for supporting ladle 10, the first hoisting appliance 12 that the side of described ladle 10 is provided with the first rotating mechanism 11 for driving the first steel ladle cover 6 to be connected with ladle 10 or to depart from and drives the first steel ladle cover 6 to be elevated; The second hoisting appliance 25 that the opposite side of described ladle 10 is provided with the second rotating mechanism 5 for driving the second steel ladle cover 1 to be connected with ladle 10 or to depart from and drives the second steel ladle cover 1 to be elevated.
In the present embodiment, by integrated design is carried out in LF refining and VOD refining, and facilitate switching ladle 10 being carried out to LF refining and VOD refining, electric-arc heating is completed when LF refining, slag refining and Argon stir, oxygen decarburization is carried out when VOD refining, vacuum outgas, Argon stirs, said process all carries out in a ladle, described ladle 10 and ladle seat 8 maintain static, only by the lifting of the first steel ladle cover 6 and the second steel ladle cover 1, rotate and match with ladle 10 and then LF refining and VOD refining are switched, complete whole refining processs of LF refining and VOD refining, especially when VOD refining, eliminate the structure of original large vacuum tank and large vacuum cover, simple and quick when adopting this integrated ladle refining equipment, described ladle 10 spatial content is relatively little, vacuumize than comparatively fast, shorten refining time, vacuum pumpdown time about 3 minutes, VOD refining process about 30 ~ 40 minutes, support the use with medium frequency induction melting furnace, greatly improve medium frequency induction melting furnace result of use, improve all drawbacks that medium frequency induction melting furnace in use exists, reduce and large-scale LF refining furnace and the matching used defect of VOD refining furnace simultaneously.
In the present embodiment, described first rotating mechanism 11 is all identical with structure with the principle of work of the second rotating mechanism 5, described second rotating mechanism 5 comprises rotating base 5-5, be rotatably connected on the rotating bearing support 5-1 on rotating base 5-5 and drive-motor 5-2, the output shaft of described drive-motor 5-2 is provided with driving toothed gear 5-3, described rotating bearing support 5-1 is provided with the follower gear 5-4 be meshed with driving toothed gear 5-3, described rotating bearing support 5-1 is provided with the second column bracket 5-6, described second steel ladle cover 1 is arranged on the second column bracket 5-6 one end away from rotating bearing support 5-1, during use, driving toothed gear 5-3 is driven to rotate by drive-motor 5-2, described driving toothed gear 5-3 drives follower gear 5-4 to rotate, described follower gear 5-4 drives rotating bearing support 5-1 to rotate on rotating base 5-5, thus drive the second column bracket 5-6 and the second steel ladle cover 1 to rotate, its second steel ladle cover 1 is completed be connected and disengaging with ladle 10.
In the present embodiment, described first hoisting appliance 12 is all identical with structure with the principle of work of the second hoisting appliance 25, described first hoisting appliance 12 comprises two elevating chain 12-1 and is arranged on four jockey sprocket 12-2 on the first column bracket 11-1 of the first rotating mechanism 11, described first column bracket 11-1 is also provided with the hoist cylinder for driving elevating chain 12-1, one end of described elevating chain 12-1 is connected with the piston rod of described hoist cylinder, the other end of described elevating chain 12-1 is walked around jockey sprocket 12-2 and is connected with the top of the first steel ladle cover 6, during use, two elevating chain 12-1 are driven to move respectively by the flexible of two described hoist cylinder piston rods, thus drive the first steel ladle cover 6 to be elevated.
As shown in Figure 1, the upper opening of described ladle 10 is up-small and down-big taper, and the bottom of described ladle 10 is connected with Argon pipe 17.By ladle 10 upper opening is carried out particular design, reduce the area of dissipation of opening, thus improve the heat insulation effect of ladle 10.And by carrying out Argon stirring bottom ladle 10, stirred by Argon, can effectively the gas of molten steel inside (oxygen, hydrogen, nitrogen) and add slag thing get rid of, molten steel is purified, and Argon pipe 17 is arranged on bottom ladle 10, ensure that, when LF refining and VOD refining, omnidistance Argon is carried out to ladle, impact when not switching by the first steel ladle cover 6 and the second steel ladle cover 1.
As shown in Figure 2, in described second steel ladle cover 1, be provided with pushing off the slag lid 19, in described second steel ladle cover 1 and the top being positioned at pushing off the slag lid 19 is provided with water-cooled screening cover 18.By arranging pushing off the slag lid 19, can, when oxygen decarburization, prevent the slag charge being suspended in liquid steel level from splashing, by arranging water-cooled screening cover 18, prevent the molten steel splashed from causing damage to steel ladle cover, decreasing the baking at steel ladle cover top.
As shown in Figure 3, described second steel ladle cover 1 is provided with vacuum feeding device 4, described vacuum feeding device 4 comprises receiving hopper 4-1 and is arranged on the vacuum hopper 4-2 be communicated with below receiving hopper 4-1 and with receiving hopper 4-1, described vacuum hopper 4-2 is connected with the second steel ladle cover 1, the outlet of described receiving hopper 4-1 is provided with the first sealing member 4-5, the outlet of described vacuum hopper 4-2 is provided with the second sealing member 4-6, the first cylinder 4-3 for driving the first sealing member 4-5 to be elevated is set in described receiving hopper 4-1, the second cylinder 4-4 for driving the second sealing member 4-6 to be elevated is provided with in described vacuum hopper 4-2, described vacuum hopper 4-2 is connected with the Vacuum Balance pipe for being communicated with ladle 10.Described second steel ladle cover 1 is provided with manual observation mouth 24.By arranging vacuum feeding device 4, when VOD refining, and when carrying out reinforced by making vacuum hopper 4-2 consistent with the vacuum tightness of ladle 10, thus conveniently the second sealing member 4-6 is opened, due to the shock action of the pressure sell of one's property life when can also prevent from feeding in raw material to ladle 10.
Composition graphs 1, Fig. 2 and Fig. 3, described ladle seat 8 is the hollow structure of inner hollow and upper opening, the upper opening of described ladle seat 8 is connected with the sealed bottom of ladle 10, the sidewall of described ladle seat 8 offers the outlet of safe bleed-out, described safe bleed-out outlet is provided with the lid 9 being easy to be melted by molten steel, the ground, side of described ladle seat 8 is provided with and exports corresponding molten steel splendid attire dish 23 with described safe bleed-out.The reason of this design is: be provided with slide gate nozzle 21 bottom ladle 10, when carrying out LF refining and VOD refining, molten steel can flow in ladle seat 8 from slide gate nozzle 21, security incident is caused for avoiding the molten steel be on the increase in ladle seat 8, and then take to arrange the outlet of safe bleed-out, lid 9 and molten steel splendid attire dish 23, when the molten steel in ladle seat 8 is on the increase, because liquid steel temperature is high, lid 9 can be melted, and then the molten steel in ladle seat 8 enters molten steel splendid attire dish 23 by safe bleed-out outlet, thus ensure that the safety in refining process, in the present embodiment, described lid 9 is made up of fusible metal aluminium.
As shown in Figure 1, this integrated ladle refining equipment comprises the vacuum extractor 7 for vacuumizing process to ladle 10 and ladle seat 8, described vacuum extractor 7 comprises the first valve tube 7-1, second valve tube 7-2, 3rd valve tube 7-3 and the 4th valve tube 7-4, described first valve tube 7-1 one end is connected with vacuum pump, concrete, described first vacuum pipe 7-1 lower end is connected by main stop valve with vacuum pump by underground vacuum pipe, described second valve tube 7-2 is connected with the first valve tube 7-1, the second steel ladle cover 1 is stretched in one end of described 3rd valve tube 7-3, the other end of described 3rd valve tube 7-3 is communicated with the second valve tube 7-2 or disconnects under the drive of the second rotating mechanism 5, described 3rd valve tube 7-3 is made up of corrugated expansion joint, one end of described 4th valve tube 7-4 is connected with the first valve tube 7-1, and the other end of described 4th valve tube 7-4 stretches into ladle seat 8 inside.By arranging vacuum extractor 7 pairs of ladles 10 and ladle seat 8 vacuumizes process, thus reach the vacuum level requirements of VOD refining, but simultaneously by vacuumizing process to ladle seat 8, avoid the vacuum environment that the gas in ladle seat 8 enters ladle 10 from the slide gate nozzle 21 bottom ladle 10 and then destroys in ladle 10.And make the 3rd valve tube 7-3 with corrugated expansion joint, can ensure, when the second rotating mechanism 5 drives the second steel ladle cover 1 to rotate, the sealing of the 3rd valve tube 7-3 can be ensured, and then facilitate the docking of the 3rd valve tube 7-3 and the second valve tube 7-2.
As depicted in figs. 1 and 2, described second steel ladle cover 1 is provided with the oxygen rifle 2 stretching into the second steel ladle cover 1 inside and oxygen lance lifting device 3, described oxygen lance lifting device 3 comprises the guidepost 3-2 be vertically arranged on the second steel ladle cover 1 and sliding support 3-1 be arranged on guidepost 3-2, and the oxygen lance lifting driving mechanism for driving sliding support 3-1 to move up and down along guidepost 3-2, described oxygen rifle 2 is arranged on sliding support 3-1.By by oxygen rifle 2 and oxygen lance lifting device 3, facilitate the oxygen decarburization when VOD refining, also oxygen rifle 2 is facilitated with oxygen lance lifting device 3 with the second steel ladle cover 1 rotation displacement, described oxygen lance lifting driving mechanism comprises driving chain 3-3 and for driving the motor of driving chain 3-3, the output terminal of described motor is connected with drive sprocket 3-4, described drive sprocket 3-4 is arranged on the bottom of guidepost 3-2, the top of described guidepost 3-2 is rotatably connected to driven sprocket 3-5, one end of described driving chain 3-3 is connected on sliding support 3-1, the other end of described driving chain 3-3 is walked around driven sprocket 3-5 and drive sprocket 3-4 successively and is connected on sliding support 3-1, during use, rotated by driven by motor drive sprocket 3-4, and then drive sliding support 3-1 to move up and down by driving chain 3-3, in the present embodiment, described drive sprocket 3-4, the quantity of driven sprocket 3-5 and driving chain 3-3 is two.
As shown in Figure 1, described first rotating mechanism 11 is provided with the electrode 15 for stretching into the first steel ladle cover 6 and electrode lifting device 16, described electrode lifting device 16 comprises the transverse arm 16-1 for the holding electrode 15 and transverse arm pillar stiffener 16-2 for fixing transverse arm 16-1, is provided with the rise fall of electrodes driving mechanism for driving transverse arm pillar stiffener 16-2 to move up and down along the first rotating mechanism 11 below described transverse arm pillar stiffener 16-2.By by electrode 15 and electrode lifting device 16, facilitate and carry out electric-arc heating when LF refining by electrode 15, also electrode 15 is facilitated with electrode lifting device 16 with the first steel ladle cover 6 rotation displacement, described rise fall of electrodes driving mechanism comprises the pillar stiffener hoist cylinder 16-3 be vertically arranged on the first rotating mechanism 11, is moved up and down along the first rotating mechanism 11 by the flexible drive transverse arm pillar stiffener 16-2 of described pillar stiffener hoist cylinder 16-3 piston rod.Described electrode 15 is connected with furnace transformer 13 by short net 14.
The method for making steel of a kind of integrated ladle refining equipment of the present invention, comprises the following steps:
Step one, load the step of ladle 10 by just making steel water;
Step 2, the first steel ladle cover 6 is made to be connected to step above ladle 10 by adjustment first hoisting appliance 12 and the first rotating mechanism 11;
Step 3, the step of LF refining that the molten steel in ladle 10 is carried out;
Step 4, make the first steel ladle cover 6 depart from ladle 10 by adjustment first hoisting appliance 12 and the first rotating mechanism 11, and make the second steel ladle cover 1 be connected to step above ladle 10 by adjustment second hoisting appliance 25 and the second rotating mechanism 5;
Step 5, the step of VOD refining that the molten steel in ladle 10 is carried out.
In the present embodiment, in step, from medium frequency induction melting furnace out molten steel when thermometric reaches 1680 DEG C, liquid steel sampling is seen whether reach just steelmaking kind index, then roasting bag makes temperature >=900 DEG C of ladle 10, molten steel is injected ladle 10, while injection molten steel, omnidistance Argon is carried out to ladle 10, molten steel to inject after ladle 10 and ladle 10 handling is tightly connected with ladle seat 8 to ladle seat 8 after skimming, then stirred through gas permeable brick 20 pairs of ladle 10 Argons by Argon pipe 17, to measuring temp of molten steel, when temperature reaches 1535 DEG C, then after the operation of step 2, carry out step 3 again, in step 3, electric-arc heating is carried out by electrode 15, then slag inclusion slag making is carried out by the cinder notch 22 that adds on the first steel ladle cover 6, described slag charge is fluorite, lime, silicon carbide, aluminum shot, ferric oxide etc., carry out reinforced adjusting component by adding cinder notch 22 simultaneously, sampling thermometric, when temperature is more than or equal to 1680 DEG C, then after the operation of step 4, step 5 is carried out again after first steel ladle cover 6 and ladle 10 are sealed by ladle upper flange and bell, in step 5, first vacuumize process by vacuum extractor 7 pairs of ladles 10 and ladle seat 8, when vacuum tightness is less than 67Pa, then vacuum-oxygen decarbonizing is carried out by oxygen rifle 2 pairs of molten steel, reinforced to adjust alloying constituent by vacuum feeding device 4 pairs of molten steel again, and then be less than or equal to 67Pa pressurize ten minutes, carry out brokenly vacancy reason again, sampling thermometric also detects alloying constituent, after adding heat preserving agent again, bull ladle is cast.This method for making steel first carries out LF refining and VOD refining, shortens refining time greatly, improves the refined quality of molten steel, and ensure that composition and the quality of refining steel.
In the present embodiment, described step 5 comprises adds alloy raw material to adjust the vacuum charging step of alloying constituent in ladle 10, and described vacuum charging step comprises:
Step 501, the step of alloy raw material of adding in receiving hopper 4-1;
Step 502, open receiving hopper 4-1 export the first sealing member 4-5, close the second sealing member 4-6, make alloy raw material enter the step of vacuum hopper 4-2 from receiving hopper 4-1;
Step 503, close described first sealing member 4-5, by Vacuum Balance pipe, vacuum hopper 4-2 is communicated with ladle 10, realizes the step that vacuum hopper 4-2 is identical with ladle 10 vacuum tightness;
Step 504, open vacuum hopper 4-2 export the second sealing member 4-6, make alloy raw material enter the second steel ladle cover 1 from vacuum hopper 4-2 and then fall into the step of ladle 10.
In the present embodiment, adopt above-mentioned vacuum charging step, effectively ensure that in the reinforced process when VOD refining, make vacuum hopper 4-2 consistent with the vacuum tightness of ladle 10, thus conveniently the second sealing member 4-6 is opened, due to the shock action of the pressure sell of one's property life when can also prevent from feeding in raw material to ladle 10.The operation of above VOD refining is carried out all under vacuum conditions, by manual observation mouth 24, can observe molten steel situation in ladle 10 at any time.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure transformation, all still belong in the protection domain of technical solution of the present invention.
Claims (10)
1. integrated ladle refining equipment, it is characterized in that: comprise ladle (10), the first steel ladle cover (6) carrying out LF refining for matching with ladle (10) and carry out second steel ladle cover (1) of VOD refining for matching with ladle (10), the bottom of described ladle (10) is connected with the ladle seat (8) for supporting ladle (10), the first hoisting appliance (12) that the side of described ladle (10) is provided with the first rotating mechanism (11) for driving the first steel ladle cover (6) and ladle (10) to be connected or to depart from and drives the first steel ladle cover (6) to be elevated, the second hoisting appliance (25) that the opposite side of described ladle (10) is provided with the second rotating mechanism (5) for driving the second steel ladle cover (1) and ladle (10) to be connected or to depart from and drives the second steel ladle cover (1) to be elevated,
Described first rotating mechanism (11) is all identical with structure with the principle of work of the second rotating mechanism (5), include rotating base (5-5), be rotatably connected on rotating bearing support (5-1) on rotating base (5-5) and drive-motor (5-2), the output shaft of described drive-motor (5-2) is provided with driving toothed gear (5-3), described rotating bearing support (5-1) is provided with the follower gear (5-4) be meshed with driving toothed gear (5-3); The rotating bearing support of described second rotating mechanism (5) is provided with the second column bracket, and described second steel ladle cover (1) is arranged on the second column bracket (5-6) one end away from the second rotating mechanism (5) rotating bearing support (5-1);
Described first hoisting appliance (12) is all identical with structure with the principle of work of the second hoisting appliance (25), described first hoisting appliance (12) comprises two elevating chains (12-1) and is arranged on four jockey sprockets (12-2) on the first column bracket (11-1) of the first rotating mechanism (11), described first column bracket (11-1) is also provided with the hoist cylinder for driving elevating chain (12-1), one end of described elevating chain (12-1) is connected with the piston rod of described hoist cylinder, the other end of described elevating chain (12-1) is walked around jockey sprocket (12-2) and is connected with the top of the first steel ladle cover (6).
2. integrated ladle refining equipment according to claim 1, is characterized in that: the upper opening of described ladle (10) is up-small and down-big taper; The bottom of described ladle (10) is connected with Argon pipe (17).
3. integrated ladle refining equipment according to claim 1, it is characterized in that: in described second steel ladle cover (1), be provided with pushing off the slag lid (19), in described second steel ladle cover (1) and the top being positioned at pushing off the slag lid (19) is provided with water-cooled screening cover (18).
4. integrated ladle refining equipment according to claim 1, is characterized in that: described second steel ladle cover (1) is provided with vacuum feeding device (4), described vacuum feeding device (4) comprises receiving hopper (4-1) and is arranged on receiving hopper (4-1) below and the vacuum hopper (4-2) be communicated with receiving hopper (4-1), described vacuum hopper (4-2) is connected with the second steel ladle cover (1), the outlet of described receiving hopper (4-1) is provided with the first sealing member (4-5), the outlet of described vacuum hopper (4-2) is provided with the second sealing member (4-6), the first cylinder (4-3) for driving the first sealing member (4-5) to be elevated is set in described receiving hopper (4-1), the second cylinder (4-4) for driving the second sealing member (4-6) to be elevated is provided with in described vacuum hopper (4-2), described vacuum hopper (4-2) is connected with the Vacuum Balance pipe for being communicated with ladle (10).
5. integrated ladle refining equipment according to claim 1, it is characterized in that: described ladle seat (8) is for inner hollow and the hollow structure of upper opening, the upper opening of described ladle seat (8) is connected with the sealed bottom of ladle (10), the sidewall of described ladle seat (8) offers the outlet of safe bleed-out, described safe bleed-out outlet is provided with the lid (9) being easy to be melted by molten steel, and the side of described ladle seat (8) is provided with and exports corresponding molten steel splendid attire dish (23) with described safe bleed-out.
6. integrated ladle refining equipment according to claim 5, is characterized in that: comprise the vacuum extractor (7) for vacuumizing process to ladle (10) and ladle seat (8), described vacuum extractor (7) comprises the first valve tube (7-1), second valve tube (7-2), 3rd valve tube (7-3) and the 4th valve tube (7-4), described first valve tube (7-1) one end is connected with vacuum pump, described second valve tube (7-2) is connected with the first valve tube (7-1), the second steel ladle cover (1) is stretched in one end of described 3rd valve tube (7-3), the other end of described 3rd valve tube (7-3) is communicated with the second valve tube (7-2) or disconnects under the drive of the second rotating mechanism (5), described 3rd valve tube (7-3) is made up of corrugated expansion joint, one end of described 4th valve tube (7-4) is connected with the first valve tube (7-1), and the other end of described 4th valve tube (7-4) stretches into ladle seat (8) inside.
7. integrated ladle refining equipment according to claim 1, it is characterized in that: described second steel ladle cover (1) is provided with and stretches into the inner oxygen rifle (2) of the second steel ladle cover (1) and oxygen lance lifting device (3), described oxygen lance lifting device (3) comprises the guidepost (3-2) be vertically arranged on the second steel ladle cover (1) and the sliding support (3-1) be arranged on guidepost (3-2), and the oxygen lance lifting driving mechanism for driving sliding support (3-1) to move up and down along guidepost (3-2), described oxygen rifle (2) is arranged on sliding support (3-1).
8. integrated ladle refining equipment according to claim 1, it is characterized in that: described first rotating mechanism (11) is provided with the electrode (15) for stretching into the first steel ladle cover (6) and electrode lifting device (16), described electrode lifting device (16) comprises the transverse arm (16-1) for holding electrode (15) and the transverse arm pillar stiffener (16-2) for fixing transverse arm (16-1), described transverse arm pillar stiffener (16-2) below is provided with the rise fall of electrodes driving mechanism for driving transverse arm pillar stiffener (16-2) to move up and down along the first rotating mechanism (11).
9. adopt a method for making steel for integrated ladle refining equipment described in claim 1, it is characterized in that, comprise the following steps:
Step one, water of just making steel load the step of ladle (10);
Step 2, the first steel ladle cover (6) is made to be connected to the step of ladle (10) top by adjustment first hoisting appliance (12) and the first rotating mechanism (11);
Step 3, the step of LF refining that the molten steel in ladle (10) is carried out;
Step 4, to be made by adjustment first hoisting appliance (12) and the first rotating mechanism (11) the first steel ladle cover (6) depart from ladle (10), and make the second steel ladle cover (1) be connected to step above ladle (10) by adjustment second hoisting appliance (25) and the second rotating mechanism (5);
Step 5, the step of VOD refining that the molten steel in ladle (10) is carried out.
10. method for making steel according to claim 9, is characterized in that, described step 5 comprises adds alloy raw material to adjust the vacuum charging step of alloying constituent in ladle (10), and described vacuum charging step comprises:
Step 501, to the step of adding alloy raw material in receiving hopper (4-1);
Step 502, open the first sealing member (4-5) that receiving hopper (4-1) exports, close the second sealing member (4-6), make alloy raw material enter the step of vacuum hopper (4-2) from receiving hopper (4-1);
Step 503, close described first sealing member (4-5), by Vacuum Balance pipe, vacuum hopper (4-2) is communicated with ladle (10), realizes the step that vacuum hopper (4-2) is identical with ladle (10) vacuum tightness;
Step 504, open the second sealing member (4-6) that vacuum hopper (4-2) exports, make alloy raw material enter the second steel ladle cover (1) from vacuum hopper (4-2) and then fall into the step of ladle (10).
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| CN104313309A (en) * | 2014-11-17 | 2015-01-28 | 中冶南方工程技术有限公司 | Technology and system for producing stainless steel by submerged arc furnace and AOD furnace duplex process |
| CN104697330B (en) * | 2015-02-13 | 2016-07-06 | 西安新达炉业工程有限责任公司 | Energy-saving multi items one drag two electrocast refractories smelting furnace |
| CN110209094A (en) * | 2019-06-21 | 2019-09-06 | 陆军军 | The rotary-type Internet of Things automation agricultural planting system and method for region magnetic suspension |
| CN110747317B (en) * | 2019-11-14 | 2021-07-13 | 泰戈精炼(北京)工程技术有限公司 | Ladle type vacuum refining furnace |
| CN116656915B (en) * | 2023-06-02 | 2023-10-24 | 南京金桓电子科技有限公司 | Ladle vacuum oxygen blowing decarburization refining device and process thereof |
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| CN203582895U (en) * | 2013-11-30 | 2014-05-07 | 西安新达炉业工程有限责任公司 | Integrated ladle refining equipment |
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