CN112775422A

CN112775422A - Slag-absorbing, filtering and separating slag-stopping wall for tundish

Info

Publication number: CN112775422A
Application number: CN202110113798.0A
Authority: CN
Inventors: 邓天鹏; 刘德全
Original assignee: Anshan Huaxing Metallurgy Furnace Charge Co ltd
Current assignee: Anshan Huaxing Metallurgy Furnace Charge Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-05-11

Abstract

The invention relates to the technical field of novel inorganic non-metallic materials, in particular to a tundish slag-absorbing, filtering and separating slag-stopping wall, wherein each group of separating slag-stopping walls comprises a first split body and a second split body; the first split body is arranged on two sides of the long nozzle, a plurality of groups of side surface flow guide holes are uniformly formed in the first split body close to the bottom in the thickness direction, a plurality of groups of top surface flow guide holes are uniformly formed in the height direction, the top surface flow guide holes are far away from one side of the side surface flow guide holes, and the top surface flow guide holes are communicated with the side surface flow guide holes in a one-to-one correspondence manner; the two split bodies and the long water gap are arranged on two different sides of the first split body, and two sides of one cross section end face of each split body are inclined towards the middle to form a vertical diversion convex ridge; the upper surface of the first split body is higher than the bottom surface of the second split body after installation, and the upper surface of the first split body is lower than the liquid level of the molten steel in the tundish. The invention replaces the slit of the traditional slag wall with the pore channel, greatly improves the adsorption area, has better effect of adsorbing polymeric inclusions, and obviously reduces the formation of vortex in molten steel.

Description

Slag-absorbing, filtering and separating slag-stopping wall for tundish

Technical Field

The invention relates to the technical field of novel inorganic nonmetallic materials, in particular to a tundish slag-absorbing, filtering and separating slag-stopping wall.

Background

Fig. 1 shows the internal structure of a conventional tundish, and in short-run steelmaking, a tundish 3 is an important refractory vessel, and receives molten steel poured from a ladle 1 through a long nozzle 2, and then the molten steel is stabilized by the tundish 3 and is adjusted and distributed to each mold through a plurality of nozzles 5 and stopper rods 6. The slag blocking walls 4 in various forms are arranged in the tundish, so that the volume of the tundish can be fully and effectively utilized, impurities in molten steel can float upwards and be separated effectively, and the height, the arrangement position and the number of the slag blocking walls have great influence on the removal of the impurities. The slag-stopping wall can be a single wall, a double wall or a multi-wall, and aims to stop slag and improve the cleanliness of molten steel. The material is generally high-alumina, and the bricks can be built in the tundish, and can also be made into precast blocks to be placed in the tundish.

In actual production, molten steel in the tundish flows locally and unevenly, and particularly, a stagnation area where the molten steel is inactive exists at the bottom of the tundish, so that inclusions are difficult to float upwards. The slag wall (weir) is added on the tundish, so that the flowing track of the molten steel can be improved, the molten steel flows along the interface of the inclusion, the floating distance of the inclusion is shortened, and the absorption of slag is facilitated. And strong eddy current caused by ladle pouring flow impact can be limited in a local area, so that turbulent flow diffusion is prevented, and surface waves are caused to coil slag into molten steel. Therefore, after the slag wall (weir and plate) is arranged on the filter belt between the turbulent flow and the laminar flow of the molten steel, the molten steel can directionally and directly flow to the surface of a molten pool, so that the residence time of the molten steel in a tundish is increased, and the separation rate of inclusions is improved.

Disclosure of Invention

In order to solve the technical problem, the invention discloses a tundish slag-absorbing, filtering and separating slag-stopping wall.

The specific technical scheme is as follows:

a tundish slag-absorbing filtering separation slag-stopping wall comprises two groups, wherein the two groups are arranged at two sides of an outlet of a long nozzle in a tundish, and each group of separation slag-stopping walls comprises a first split body and a second split body; the split body I is arranged on two sides of the long nozzle, the cross section of the split body I is trapezoidal and is matched with the cross section of the bottom of the tundish, a plurality of groups of side surface diversion holes are uniformly formed near the bottom in the thickness direction, a plurality of groups of top surface diversion holes are uniformly formed in the height direction, the top surface diversion holes are far away from one side of the side surface diversion holes, and the top surface diversion holes are communicated with the side surface diversion holes in a one-to-one correspondence manner; the split body II and the long nozzle are arranged on two different sides of the split body I, the cross section of the split body II is trapezoidal and is matched with the cross section of the upper part of the tundish, a pair of lifting rings are arranged at the top of the split body II, and two sides of one cross section end face are inclined towards the middle to form a vertical diversion convex ridge; the upper surface of the first split body is higher than the bottom surface of the second split body after installation, and the upper surface of the first split body is lower than the liquid level of the molten steel in the tundish.

The top surface diversion holes are communicated with the side surface diversion holes, and the side surface diversion holes form a certain upper elevation angle.

A section of buffer opening is arranged in the middle of the bottom surface of the split body along the thickness direction.

One surface of the split body II with the flow guide convex ridge is uniformly provided with spoon-shaped inwards-concave slag blocking auxiliary grooves in the vertical direction, and the spoon head of the spoon is upward.

The upper elevation angle is 30-60 degrees.

The cross section of the buffer opening is square.

Compared with the prior art, the invention has the following beneficial technical effects:

in the process, the inclusions in the molten steel are adsorbed and grown up, the molten steel normally flows when flowing out of the top guide hole, the inclusions are separated from the molten steel and gathered, are blocked by the two split bodies and the slag stopping auxiliary tank in the horizontal direction, are hung by the spoon head of the slag stopping auxiliary tank and return to the liquid level of the molten steel again, and stay at the liquid level of the molten steel and above under the action of buoyancy in the vertical direction, so that the molten steel is separated from pure molten steel. The pure molten steel continuously flows through the gaps between the bottoms of the two split bodies and the tundish and is distributed into the flow crystallizers through the submerged nozzles. In the process, the arrangement of the separation slag wall can reduce the dead zone in the molten steel, the pore passage replaces the slit of the traditional slag wall, the adsorption area is greatly increased, the effect of adsorbing the polymeric inclusion is better, and the formation of the vortex in the molten steel is obviously reduced.

The guide convex ridge can guide the flow of the molten steel from the center shaft of the tundish to the two sides of the center shaft rapidly, so that the flow in the molten steel is increased, and dead angles are avoided. A section of buffer opening is formed in the middle of the bottom surface of the first split body along the thickness direction, so that the impact of molten steel flow at the outlet of the long nozzle can be effectively relieved. One surface of the split body II with the flow guide convex ridge is uniformly provided with spoon-shaped inwards-concave slag blocking auxiliary grooves in the vertical direction, the spoon head of the spoon is upward, more groove grooves capable of hanging impurities can be formed on the surface of the split body II, the impurities are prevented from flowing through the crystallizer through a gap at the bottom of the split body II under the clamping of molten steel liquid flow, and the quality of a casting blank is guaranteed.

Drawings

FIG. 1 is a conventional tundish internal construction;

FIG. 2 is a front view of a split body of the separation slag dam of the present invention;

FIG. 3 is a rear elevation view of a split portion of the separation slag dam of the present invention;

FIG. 4 is a front view of a split body of the separation slag trap wall of the present invention;

FIG. 5 is a top plan view of a split body of the separation slag dam of the present invention;

FIG. 6 is a schematic view of the installation of the separation slag dam of the present invention;

FIG. 7 is a schematic structural view of a split secondary slag groove of the separating slag-stopping wall according to the present invention;

FIG. 8 is a schematic view showing the operation of the separation slag wall according to the present invention.

In the figure, 1 — ladle; 2-long water gap; 3, pouring a tundish; 4-slag wall; 5, an immersion type water gap; 6, plugging the rod; 7, splitting; 8-a second split; 9-a hoisting ring; 10-flow guiding convex ridge; 11-side flow guide holes; 12-top surface flow guide holes; 13-buffer port; 14-molten steel; 15-auxiliary slag-stopping groove.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the drawings.

Fig. 2 is a front view of a separated body of the separation slag-stopping wall of the present invention, fig. 3 is a rear view of a separated body of the separation slag-stopping wall of the present invention, fig. 4 is a front view of a separated body of the separation slag-stopping wall of the present invention, fig. 5 is a top view of a separated body of the separation slag-stopping wall of the present invention, fig. 6 is an installation schematic view of the separation slag-stopping wall of the present invention, fig. 7 is a structural schematic view of a separated body of the separation slag-stopping wall of the present invention, as shown:

the tundish slag-absorbing filtering separation slag-stopping wall comprises two groups, wherein the two groups are arranged at two sides of an outlet of a long water gap 2 in a tundish, and each group of separation slag-stopping walls comprises a first split body 7 and a second split body 8; the first split bodies 7 are arranged on two sides of the long nozzle 2, the cross sections of the first split bodies 7 are trapezoidal and are matched with the cross section of the bottom of the tundish 3, a plurality of groups of side surface diversion holes 11 are uniformly formed near the bottom in the thickness direction, a plurality of groups of top surface diversion holes 12 are uniformly formed in the height direction, the top surface diversion holes 12 are far away from one side of the side surface diversion holes 11, and the top surface diversion holes 12 are communicated with the side surface diversion holes 11 in a one-to-one correspondence manner; the split body II 8 and the long nozzle 2 are arranged on two different sides of the split body I7, the cross section of the split body II 8 is trapezoidal and is matched with the cross section of the upper part of the tundish 3, the top of the split body II 8 is provided with a pair of lifting rings 9, and the end surface of one cross section is provided with a vertical diversion convex ridge 10 formed by inclining two sides to the middle; the upper surface of the first split body 7 is higher than the bottom surface of the second split body 8 after installation, and the upper surface of the first split body 7 is lower than the liquid level of the molten steel 14 in the tundish.

The top surface diversion holes 12 are communicated with the side surface diversion holes 11, and the side surface diversion holes 11 form an upper elevation angle of 30-60 degrees. A section of buffer opening 13 is formed in the middle of the bottom surface of the first split body 7 along the thickness direction. One surface of the split body 8 with the flow guiding convex ridge 10 is uniformly provided with spoon-shaped concave slag blocking auxiliary grooves 15 in the vertical direction, and the spoon head of the spoon is upward. The cross section of the buffer opening 13 is square.

Fig. 8 is a schematic view of the operation of the separating slag trap wall of the present invention, and as shown in the drawing, in the tundish, a first split body 7 and a second split body 8 are respectively installed from the long nozzle 2 to both sides, the first split body 7 is installed at both sides of the long nozzle 2, and the second split body 8 is installed at two different sides of the first split body 7 through a hanging ring 9 and the long nozzle 2. Molten steel in a steel ladle 1 flows into a tundish through a long nozzle 2, the molten steel flows from an outlet of the long nozzle to the periphery, the molten steel is blocked by a first split body 7, the molten steel flows in through a side guide hole 11 and flows out through a top guide hole 12, in the process, inclusions in the molten steel are adsorbed and grow, the molten steel normally flows when flowing out from the top guide hole 12, the inclusions are separated from the molten steel and are gathered, the inclusions are blocked by a second split body 8 and a slag blocking auxiliary groove 15 in the horizontal direction, the inclusions are hung by a spoon head of the slag blocking auxiliary groove 15 and return to the liquid level of the molten steel again, and the inclusions stay at and above the liquid level of the molten steel under the action of buoyancy in the vertical direction, so that the inclusions are separated from the molten steel in a. The pure molten steel continuously flows through the gap between the bottom of the split body II 8 and the tundish and is distributed into the flow crystallizers through the submerged nozzles.

Claims

1. The utility model provides a sediment filtering separation pushing off slag wall is inhaled to middle package, includes two sets ofly, installs in the inside export both sides at the long mouth of a river of middle package, its characterized in that: each group of separated slag blocking walls comprises a first split body and a second split body; the split body I is arranged on two sides of the long nozzle, the cross section of the split body I is trapezoidal and is matched with the cross section of the bottom of the tundish, a plurality of groups of side surface diversion holes are uniformly formed near the bottom in the thickness direction, a plurality of groups of top surface diversion holes are uniformly formed in the height direction, the top surface diversion holes are far away from one side of the side surface diversion holes, and the top surface diversion holes are communicated with the side surface diversion holes in a one-to-one correspondence manner; the split body II and the long nozzle are arranged on two different sides of the split body I, the cross section of the split body II is trapezoidal and is matched with the cross section of the upper part of the tundish, a pair of lifting rings are arranged at the top of the split body II, and two sides of one cross section end face are inclined towards the middle to form a vertical diversion convex ridge; the upper surface of the first split body is higher than the bottom surface of the second split body after installation, and the upper surface of the first split body is lower than the liquid level of the molten steel in the tundish.

2. The tundish slag-absorbing filtering-separating slag-stopping wall according to claim 1, characterized in that: the top surface diversion holes are communicated with the side surface diversion holes, and the side surface diversion holes form a certain upper elevation angle.

3. The tundish slag-absorbing filtering-separating slag-stopping wall according to claim 1, characterized in that: a section of buffer opening is arranged in the middle of the bottom surface of the split body along the thickness direction.

4. The tundish slag-absorbing filtering-separating slag-stopping wall according to claim 1, characterized in that: one surface of the split body II with the flow guide convex ridge is uniformly provided with spoon-shaped inwards-concave slag blocking auxiliary grooves in the vertical direction, and the spoon head of the spoon is upward.

5. The tundish slag-absorbing filtering-separating slag-stopping wall according to claim 2, characterized in that: the upper elevation angle is 30-60 degrees.

6. The tundish slag-absorbing filtering-separating slag-stopping wall according to claim 3, characterized in that: the cross section of the buffer opening is square.