CN116334343A - Device for improving absorptivity of converter alloy and operation method thereof - Google Patents

Abstract

The invention discloses a device for improving the alloy absorptivity of a converter, which comprises a slag blocking ball, wherein the slag blocking ball is of a Miesner tetrahedron structure, an upper fixing ring and a lower fixing ring are respectively clamped on a ball body of the slag blocking ball, a hanging wire is connected between the upper fixing ring and the lower fixing ring, one end of the hanging wire is connected with a hanging ring, and the hanging ring is connected with a hanging hook. The invention can reduce the slag carrying amount in the tapping process of the converter, is beneficial to post-process treatment, reduces the alloy consumption in the molten steel deoxidizing alloying process, increases manganese pig iron behind the converter, reduces the consumption of silicon-manganese alloy, is beneficial to reducing the consumption of steel materials, has no damage in the using and transporting processes and strong slag breaking capacity, and is more suitable for converter steelmaking conditions.

Description

Device for increasing absorption rate of converter alloy and its operation method

technical field

The invention belongs to the technical field of converter steelmaking equipment, in particular to a device for increasing the absorption rate of a converter alloy, and also relates to an operation method for increasing the absorption rate of a converter alloy.

Background technique

Recently, the iron and steel industry market has fluctuated greatly, and steel prices have been in a downturn. Major iron and steel enterprises have adopted different methods to reduce costs and increase efficiency. In the steelmaking process, the total cost of converter steelmaking accounts for more than 80%. Therefore, reducing alloy consumption through process optimization has become the focus of many enterprises, and customers have put forward higher requirements for the quality of steel.

At present, tapping with less slag is one of the effective methods to increase the yield of alloy. In the process of converter tapping, the slag blocking effect directly affects the alloy consumption and the quality of molten steel. Among many slag blocking technologies, the cost of sliding slag blocking is high, while ordinary slag blocking There are many deficiencies in the technology, the slag blocking effect is poor and unstable, and the amount of slag in the molten steel is large, which leads to serious burning of the alloy elements, increases the cost of the alloy, and even slag during the tapping process of the converter, resulting in excess phosphorus and alloy elements and other quality Accidents, and the existing spherical slag blocking ball has weak ability to break the slag shell, and it is easy to receive interference during use, and the effect is poor.

Contents of the invention

The purpose of the invention is to provide a device for improving the absorption rate of the converter alloy, which can efficiently break the slag shell and reduce the amount of slag carried by the converter.

Another object of the present invention is a method of operation for increasing the absorption rate of converter alloys.

The first technical solution adopted in the present invention is that the device for improving the absorption rate of the converter alloy includes a slag blocking ball, which is set as a Meissner tetrahedral structure, and the ball body of the slag blocking ball is respectively clamped with an upper fixing ring and a slag blocking ball. The lower fixing ring, the upper fixing ring and the lower fixing ring are connected with a hanging wire, one end of the hanging wire is connected with a lifting ring, and the hanging ring is connected with a suspension hook.

The present invention is also characterized in that,

The internal material of the slag blocking ball is magnesia refractory material, and the surface of the slag blocking ball is covered with cast iron.

The density of the slag blocking ball is not less than the density of molten steel, and the density of the slag blocking ball is not greater than the density of molten slag.

The lower fixing ring includes a lower fixing plate, and the middle part of the lower fixing plate is provided with a lower clamping hole. The edge of the fixed plate is fixedly connected with a plurality of first fixed rods along its circumferential direction, and the shaft of each first fixed rod is provided with a plurality of locking grooves along its circumferential direction.

The upper fixing ring includes an upper fixing plate, and an upper clamping hole is opened in the middle of the upper fixing plate, and the upper clamping hole is matched with the slag blocking ball, and a plurality of second fixing rods are affixed to the edge of the upper fixing plate along its circumferential direction.

Another technical solution adopted in the present invention is that the operation method for improving the absorption rate of the converter alloy uses a device for improving the absorption rate of the converter alloy, and is specifically implemented according to the following steps:

Step 1. Connect the lower clamping hole and the upper clamping hole to the upper and lower parts of the slag blocking ball respectively, wrap the hanging wire on the clamping groove, and then surround and pass through the clamping hole;

Step 2. The hanging wire passing through the hole is wound around the second fixing rod, and the excess part is connected with the lifting ring, and the lifting ring is connected with the hook. The hook is installed on the big arm of the slag-stopping truck and clamped and fixed;

Step 3. Rotate the slag-stopping car, check the reference line, align the big arm of the slag-stopping car with the furnace mouth, and put the slag-stopping ball at a position above 1000mm from the slag surface when the converter is tapping 3/4;

Step 4. Determine the amount of high manganese pig iron to be added according to the tapping temperature before tapping. Weigh the high manganese pig iron and add it to the hopper. The time for tapping the converter is one minute or when the molten steel in the ladle reaches 3-4 layers of bricks. Pig iron is added to the ladle through the alloy chute.

Another technical solution of the present invention is characterized in that,

The side length of the equilateral triangle of the slag blocking ball is not less than 1/3 of the tapping radius.

The beneficial effects of the present invention are that the present invention can reduce the amount of slag in the tapping process of the converter, which is beneficial to the post-process treatment, reduces the amount of alloy used in the deoxidation and alloying process of molten steel, and adds high manganese pig iron after the furnace to reduce the amount of silicon-manganese alloy. It is beneficial to reduce the consumption of steel materials. The surface of the new slag blocking ball is cast iron, which is not damaged during use and transportation, and has strong slag breaking ability, which is more suitable for converter steelmaking conditions.

Description of drawings

Fig. 1 is the structural schematic diagram of the device for improving the absorption rate of converter alloy in the present invention;

Fig. 2 is a structural schematic diagram of a slag-stopping ball in a device for improving the absorption rate of a converter alloy in the present invention;

Fig. 3 is a schematic structural view of the lower fixing ring in the device for increasing the absorption rate of the converter alloy in the present invention;

Fig. 4 is a schematic structural view of the upper fixing ring in the device for increasing the absorption rate of the converter alloy according to the present invention.

In the figure, 1. suspension ring, 2. suspension hook, 3. suspension wire, 4. upper fixing ring, 41. second fixing rod, 42. upper clamping hole, 43. upper fixing plate, 5. lower fixing ring, 51. The first fixed rod, 52. the slot, 53. perforation, 54. the lower hole, 55. the lower fixed disc, and 6. the slag blocking ball.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The device for improving the absorption rate of converter alloys in the present invention, as shown in Figure 1, includes a slag blocking ball 6, which is set as a Meissner tetrahedral structure, and the slag blocking is accurate and stable, with small influencing factors. The body of the slag blocking ball 6 An upper fixing ring 4 and a lower fixing ring 5 are clamped respectively, and a hanging wire 3 is connected between the upper fixing ring 4 and the lower fixing ring 5, and one end of the hanging wire 3 is connected with a lifting ring 1, and the lifting ring 1 is connected with a suspension hook 2.

As shown in Figure 2, the side length of the equilateral triangle of the slag retaining ball 6 is not less than 1/3 of the tapping radius to ensure that the tetrahedron can cover the diameter of the tapping hole. With the three vertices of the equilateral triangle as round points, the side length is the radius, draw three circles, the intersecting part of the three circles obtains the Relau triangle, and the three-dimensional structure formed by it is the shape of the Meissner tetrahedral slag-blocking ball. The geometric shape of the slag blocking ball 6 conforms to the flow law of the molten steel in the furnace, and the slag shell is easy to break. After being put in, it floats with the steel flow, and the positioning is accurate after reaching the tapping hole.

The internal material of the slag blocking ball 6 is magnesia refractory material and counterweight iron, which has the functions of corrosion resistance and high temperature resistance. The surface of the slag blocking ball 6 is wrapped with cast iron to avoid mechanical damage during transportation and use.

The density of the slag blocking ball 6 is not less than the density of molten steel, and the density of the slag blocking ball 6 is not greater than the density of molten slag. The formula for calculating the density of molten steel is: ρ _{molten steel} = 8523-(t-273), the unit of t is °C, and the unit of ρ is kg/m ³ . The formula for calculating the density of slag is: ρ _slag =0.45(cao%)+0.286(sio2%)+0.204(feo%)+0.35(fe2o3%)+0.237(mno%)+0.367(mgo%)+0.48( p2o5%)+0.402(AI

2O3%), the unit of ρ slag is kg/m ³ .

As shown in Figure 3, the lower fixing ring 5 includes a lower fixing disc 55, the middle part of the lower fixing disc 55 is provided with a lower clamping hole 54, the lower clamping hole 54 is matched with the slag retaining ball 6, and the surface of the lower fixing disc 55 is provided with several perforations 53, the perforation 53 is evenly arranged around the circumferential direction of the lower clamping hole 54, and the edge of the lower fixed plate 55 is fixedly connected with a number of first fixed rods 51 along its circumferential direction, and the shaft of each first fixed rod 51 is fixed along its circumferential direction. Several card slots 52 are opened. The edges of the lower clamping hole 54 are all arc-shaped, which is convenient for clamping the slag retaining ball 6. The number of perforations 53 is set to 4, and the 4 perforations 53 are respectively arranged in the middle of each arc-shaped edge of the lower clamping hole 54. The first The fixing rod 51 is arranged opposite to the through hole 53 to facilitate the connection of the hanging wire 3 .

As shown in Figure 4, the upper fixing ring 4 includes an upper fixing disc 43, the middle part of the upper fixing disc 43 is provided with an upper clamping hole 42, the upper clamping hole 42 is matched with the slag blocking ball 6, and the edge of the upper fixing disc 43 is along its circumferential direction. A plurality of second fixing rods 41 are fixedly connected. The edge of the upper clamping hole 42 is also configured as an arc, which is convenient for clamping the slag retaining ball 6 .

The operation method for improving the absorption rate of converter alloys is to use the device for increasing the absorption rate of converter alloys, and the specific steps are as follows:

Step 1. Connect the lower clamping hole 54 and the upper clamping hole 42 with the upper and lower parts of the slag blocking ball 6 respectively, wrap the hanging wire 3 on the clamping groove 52, and then surround and pass through the perforation 53;

Step 2. The hanging wire 3 passing through the perforation 53 is wound around the second fixing rod 41, and the excess part is connected with the lifting ring 1, and the lifting ring 1 is connected with the hook 2. The hook 2 is installed on the large arm of the slag blocking vehicle and clamped. fixed;

Step 3. Rotate the slag stop car, adjust the arm of the slag stop car to be on the same line as the tapping hole, check the reference line, align the big arm of the slag stop car with the furnace mouth, and stop the slag when 3/4 of the steel is tapped from the converter The ball 6 is thrown at a position above 1000mm from the slag surface;

Step 4. Determine the amount of high manganese pig iron to be added according to the tapping temperature before tapping. Weigh the high manganese pig iron and add it to the hopper. The time for tapping the converter is one minute or when the molten steel in the ladle reaches 3-4 layers of bricks. Pig iron is added to the ladle through the alloy chute.

During operation, there is no need to look for information such as the furnace angle, the scale of the arm of the slag stopper, etc. Just make sure that the boom of the slag stopper and the taphole are on the reference line, even if the furnace type changes and the position of the taphole deviates, the precision is higher than the traditional manual casting method. When the slag blocking ball falls into the molten steel gyration area, it will be rotated and floated due to the gravity of the eddy current. As the liquid level of the molten pool falls, it will just block the tap hole to complete the slag blocking task when the molten steel is exhausted.

The present invention designs a new type of Meissner tetrahedral slag blocking ball, whose geometric shape conforms to the changing law of steel flow in the furnace. The slag breaking ability is stronger than that of other types of slag blocking balls. Any surface can realize slag blocking. The device replaces manual labor and improves the feeding accuracy. The improvement of slag can achieve less slag tapping, and the entire operation process is completed mechanically, avoiding the risk of high temperature scalding. The operation process is safe and reliable, and does not affect the normal converter operation.

Claims (7)

1. Improve converter alloy absorptivity device, its characterized in that includes pushing off slag ball (6), pushing off slag ball (6) set up to the structure of Meisson tetrahedron, the ball body joint of pushing off slag ball (6) has fixed ring (4) and lower fixed ring (5) respectively, be connected with drop wire (3) between fixed ring (4) and lower fixed ring (5), the one end of drop wire (3) is connected with rings (1), be connected with lifting hook (2) on rings (1).

2. The device for improving the absorptivity of the converter alloy according to claim 1, wherein the internal material of the slag blocking ball (6) is a magnesium refractory material, and cast iron is wrapped on the surface of the slag blocking ball (6).

3. The device for improving the absorptivity of the converter alloy according to claim 1, wherein the density of the slag-stopping balls (6) is not less than the density of molten steel, and the density of the slag-stopping balls (6) is not more than the density of slag.

4. The device for improving the absorptivity of the converter alloy according to claim 1, wherein the lower fixing ring (5) comprises a lower fixing disc (55), a lower clamping hole (54) is formed in the middle of the lower fixing disc (55), the lower clamping hole (54) is matched with the slag blocking ball (6), a plurality of through holes (53) are formed in the surface of the lower fixing disc (55), the through holes (53) are uniformly formed around the circumference of the lower clamping hole (54), a plurality of first fixing rods (51) are fixedly connected to the edge of the lower fixing disc (55) along the circumference of the lower fixing disc, and a plurality of clamping grooves (52) are formed in the rod body of each first fixing rod (51) along the circumference of the rod body.

5. The device for improving the absorptivity of the converter alloy according to claim 1, wherein the upper fixing ring (4) comprises an upper fixing disc (43), an upper clamping hole (42) is formed in the middle of the upper fixing disc (43), the upper clamping hole (42) is matched with the slag blocking ball (6), and a plurality of second fixing rods (41) are fixedly connected to the edge of the upper fixing disc (43) along the circumferential direction of the edge of the upper fixing disc.

6. A method for improving the absorptivity of a converter alloy, using the converter alloy absorptivity improving apparatus according to claim 1, characterized by comprising the steps of:

step 1, respectively clamping a lower clamping hole (54) and an upper clamping hole (42) with the upper part and the lower part of a ball body of a slag blocking ball (6), winding the slag blocking ball on a clamping groove (52) through a hanging wire (3), and then surrounding and penetrating through a perforation (53);

step 2, winding a second fixing rod (41) by a hanging wire (3) penetrating through the perforation (53), connecting the redundant part with a hanging ring (1), connecting the hanging ring (1) with a lifting hook (2), and installing the lifting hook (2) at a large arm throwing position of a slag car and clamping and fixing the lifting hook;

step 3, rotating the slag blocking vehicle, checking a reference line, aligning a large arm of the slag blocking vehicle to a furnace mouth, and throwing a slag blocking ball (6) at a position which is more than 1000mm away from a slag surface when the converter taps 3/4;

and step 4, determining the addition amount of the high-manganese pig iron according to the tapping temperature before tapping, weighing the high-manganese pig iron, adding the high-manganese pig iron into a hopper, and adding the high-manganese pig iron into the ladle through an alloy chute when the tapping time of the converter is one minute or molten steel in the ladle is discharged to 3-4 layers of bricks.

7. Operating method for increasing the absorptivity of a converter alloy according to claim 6, characterized in that the equilateral triangle of the slag-stopping balls (6) has a side length not smaller than 1/3 of the tapping radius.

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