RU2786735C1 - Method and device for introducing a slag-forming mixture onto the melt surface in a multi-section tundish ccm - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy and can be used in the continuous casting of steel. The slag-forming mixture is supplied by introducing a working body made in the form of a multi-sectional container, cantilevered on a manipulator with the possibility of longitudinal movement and rotation, into the space above the surface of the metal melt and the said mixture is unloaded onto the surface of the metal melt simultaneously into all sections of the tundish by overturning the said multi-section containers.

EFFECT: invention makes it possible to reduce the duration of auxiliary operations, increase the casting productivity and simplify the maintenance of the CCM, as well as create a uniform slag layer on the melt surface.

7 cl, 7 dwg

Description

The present invention relates to the field of metallurgy, and specifically to the continuous casting of steel.

Known methods and devices for metered supply of bulk materials to the surface of the melt in a steel ladle containing a block of feed bins with dispensers, transporting devices in the form of a system of conveyors and a feeder / A.V. Protasov, B.A. Sivak, V.I. Zolotukhin. Technological complexes for processing molten metals with injection wire // Stary Oskol. Fine science-intensive technologies. 2019, p. 376/.

However, this device is characterized by a complex and bulky design, which makes it difficult to fit into the cramped dimensions of the continuous casting machine.

A device for supplying bulk materials to the CCM mold, including a feed hopper, a transport device in the form of a screw conveyor and a feeder, is known. Ganin, K.V. Litsin, E.A. Shevchenko. Review and analysis of devices for supplying slag-forming mixtures to the molds of continuous casting machines//. BI "Ferrous Metallurgy", 2018, No. 1, fig. 4/.

There is also known a method of supplying bulk materials to the surface of the molten metal, including dosing portions of the material, transporting to the discharge zone and supplying the material to the surface of the melt.

However, this method and device have limited functionality associated with insufficient productivity and are unsuitable for uniform distribution of material over a large surface, for example, in a CCM tundish, especially containing a number of sections covered with heat-insulating covers. / V.A. Kudrin. Out-of-furnace processing of cast iron and steel // M. Metallurgy. 1992, p. 274, Fig. 8.1/.

The disadvantages of the known device are associated with limited functionality - the supply of materials exclusively in the local area. In addition, the design of the device is characterized by complexity and limited productivity, which does not allow using this device to create a uniform slag layer in the CCM tundish on a significantly larger surface. In addition, the tundish of a modern CCM consists of a number of sections separated by partitions and covered with heat-insulating covers, which help reduce heat losses, but make it difficult to direct slag to the melt surface.

The technical result of the proposed technical solution is to increase the productivity of the slag-forming mixture supply system (SHOS) on the melt surface in a multi-section tundish CCM, to reliably create a uniform slag layer on the melt surface in the tundish, to simplify the design of the device and improve service conditions.

The technical result is achieved by the fact that the slag-forming mixture is fed to the surface of the melt into a multi-section tundish by introducing into the space above the surface of the melt and overturning the multi-section working body with the number of sections loaded with SCOs equal to the number of sections of the tundish. The device for introduction of SCO on the surface of the melt in a multi-section tundish CCM, contains service hoppers with feeders and a manipulator, made with the possibility of horizontal movement and overturning of the working multi-section working body. The working body is made in the form of a pipe cantilevered on the manipulator with openings equally oriented relative to the longitudinal axis of the loading device, as well as with partitions located along the edges of the openings.

For simultaneous loading of all sections of the working body with bulk material, several hoppers can be used, which can be loaded with the same material or different ones, which expands the functionality of the method by supplying various bulk materials.

The cover of the tundish can be made trough-shaped with longitudinal and end walls, while in the lower part of one of the end walls there is an opening for the passage of the working body or a flat shape, using which the opening for the passage of the working body is made in the upper part of the end wall of the tundish.

When pouring metal through a centrally located submersible nozzle, the material can be fed into the tundish by means of two working bodies spaced from the longitudinal axis of the tundish through two openings located in the lower part of the end wall of the lid or in the upper part of the tundish wall.

Above the openings for introducing the working body under the cover of the tundish, a local screen (umbrella) is installed, connected to the workshop gas outlet path.

The essence of the proposed technical solution is illustrated by examples of its specific implementations with reference to the attached drawings, where:

- in Fig. 1 shows a diagram of the implementation of the method in the process of loading the slag-forming mixture into the working body;

- in Fig. 2 - the same in the process of unloading the material onto the surface of the melt,

- in Fig. 3 - scheme of material loading during pouring through a submersible nozzle

- in Fig. 4 is a section A-A according to FIG. 2;

- in Fig. 5 - section B-B in Fig. 3;

- in Fig. 6 - section B-B in Fig. 3 with flat cover;

- in Fig. 7 is a top view of the working body with the cover removed (view B in Fig. 3), a variant of the device with a flat tundish cover.

In section 1 of the working body 2 from feed bins 3 of the loading device 4, powdered or granular slag-forming mixture 6 is loaded through feeders 5. Then the working body 2 is loaded by means of a manipulator 7 mounted on a drive cart 8 through an opening 9 in the end wall 10 of the cover 11 of the tundish 12 is introduced into the space between the cover 11 and the surface of the molten metal 13 in the tundish 12 and, after overturning, using the rotation drive 14, unloads the mixture onto the surface of the molten metal 13 simultaneously in all sections 15 of the tundish 12 formed by partitions 16. A layer of slag 17 is formed on the surface of the metal 13 The molten metal is fed into the tundish 12 through the pouring nozzle 18 with a sliding gate 19 from the pouring ladle 20. From the tundish, liquid metal enters the molds 21 for continuous casting of billets, the hardened billet 22 is pulled out of the mold 21 by pulling rollers 23.

The device for implementing the method includes a loading device 4 containing a block of feed bins 3 with feeders 5, and a working body 2 made in the form of a pipe 24 cantilevered on the manipulator 7 with a plug 25, equally oriented openings 26 and partitions 27 forming in the working body 2 sections 1, the number of which corresponds to the number of sections 15 of the tundish 12. The manipulator 7 is mounted on the cart 8. The cover 11 of the tundish is made trough-shaped and contains end 10 and longitudinal 28 walls. In one of the end walls 10 of the lid 11, an opening 9 is made for the passage of the working body 2. In the partitions 16 of the tundish 12, openings 29 are made for the flow of liquid metal between sections 15 and leveling the level of liquid metal in the tundish.

Due to the simultaneous loading of the SHOS into all sections of the tundish, the duration of auxiliary operations is reduced, the casting productivity is increased, and maintenance of the CCM is simplified. This scheme of loading the SCO provides the possibility of prompt adjustment of the composition and renewal of the SCO. During the casting process, non-metallic inclusions are released from the metal flowing through the tundish, which are assimilated by the slag layer. As it becomes contaminated with non-metallic inclusions, the slag is removed through the drain sock and the operation of loading a new slag-forming mixture is repeated.

The cover of the tundish can be made trough-shaped, as shown in fig. 1.2, or a flat shape, as shown in fig. 6. At the same time, openings 31 are made in the upper part of the end wall 30 of the tundish 12 for the passage of the working body 2. With the same capacity and maintaining the total height of the tundish covered with a lid, the use of a trough-shaped cover makes it possible to simplify the design of its walls 28,30 and partitions 16, but complicates the design and increases the mass of the lid itself.

Compared to the known designs of tundish, the presence of an opening in the wall and a canopy 32 connected to the gas exhaust path makes it possible to evacuate gaseous dusty reaction products and thereby improve service conditions.

For use in the operation of tundish with a submersible pouring nozzle and / or locking devices, a variant of the device with two working bodies spaced from the longitudinal axis of the tundish through two openings and located in the lower part of the end wall of the lid or in the upper part of the tundish wall (Fig. 3, 5, 6, 7.

Thus, thanks to the use of this technical solution, the duration of loading the SCO is reduced, the uniformity and operational properties of the slag coating are improved, and maintenance of the CCM is also simplified. In addition, the organized evacuation of gaseous reaction products improves the working conditions of personnel in the workspace of the shop and improves the environmental performance of the equipment.

Claims (7)

1. A method for supplying a slag-forming mixture to the melt surface in a multi-section tundish CCM, including dosed loading of the slag-forming mixture into the working body, moving the working body to the unloading zone and pouring said mixture onto the surface of the metal melt, characterized in that the supply of the slag-forming mixture is carried out by introducing a working body, made in the form of a multi-sectional container, cantilevered on a manipulator with the possibility of longitudinal movement and rotation, into the space above the surface of the molten metal and unload the said mixture onto the surface of the molten metal simultaneously into all sections of the tundish by overturning the said multi-sectional container. 2. A device for supplying a slag-forming mixture to the surface of the melt in a multi-section tundish CCM, containing consumable hoppers with feeders, a working body and a mechanism for moving the working body, characterized in that the working body is made in the form of a multi-section container, cantilevered mounted on a manipulator with the possibility of longitudinal movement and turn. 3. The device according to claim 2, characterized in that the multi-section container is made in the form of a pipe with openings equally oriented relative to the longitudinal axis and limited partitions, while the number of openings corresponds to the number of sections of the tundish. 4. The device according to claim 2 or 3, characterized in that it additionally comprises a tundish cover made of a trough-shaped shape with longitudinal and end walls, and an opening for the passage of the working body is made in one of the end walls of the cover. 5. The device according to claim 2 or 3, characterized in that it additionally comprises a tundish cover made flat, and an opening for the passage of the working body is made in the end wall of the tundish. 6. The device according to any one of paragraphs. 2-5, characterized in that when pouring metal through a centrally located submersible nozzle, the slag-forming mixture is supplied to the tundish by means of two working bodies spaced from the longitudinal axis of the tundish, through two openings, which are located in the lower part of the end wall of the lid or in the upper parts of the wall of the tundish. 7. The device according to any one of paragraphs. 4-6, characterized in that a shelter is installed above the opening in the end wall of the tundish, connected to the gas outlet path.

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