RU2771099C1 - Refractory masonry at the junction of the walls and the bottom of the converter - Google Patents

Abstract

FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular to the lining of an oxygen converter with a detachable bottom. The annular masonry of molded refractory products of the converter bottom partially overlaps the butt joint between the body and the bottom of the converter, the distance between the molded refractory products of the lower part of the converter and the bottom of the converter is filled with a refractory ramming mass, above which there are two protective rows of molded refractory products, the end surfaces of which are on the side of the walls converters have an angle of inclination of 25–60° with respect to the converter vertical. The thickness of the molded refractory products of the lower protective row is 1.1–2.2 of the thickness of the molded refractory products of the upper protective row.EFFECT: invention makes it possible to exclude the passage of metal during the smelting process, and also provides the possibility of installing blowing blocks for bottom blowing.6 cl, 1 dwg

Description

The invention relates to ferrous metallurgy, in particular to the lining of an oxygen converter with a detachable bottom.

A lining of the lower part of the converter with a detachable bottom is known, in which the molded refractory products used in the masonry for the joint or gap have, on the one hand, the angle of inclination of the end surfaces from the side of the lower part of the walls of the converter α1, equal to 0.5-25° and corresponding to the angle of inclination tangent α2, drawn along the extreme points of the molded refractory products in the lower part of the converter walls, and on the opposite side, the angle of inclination of the end surface α3 adjacent to the lining of the detachable bottom, equal to 0.5-25° and corresponding to the angle of inclination of the extreme row α4 of the lining of the detachable bottom [ Patent RU 2722949, IPC C21C5/44, 2020].

The disadvantage of this lining is the use of a mortar when joining the bottom and the likelihood of these refractories falling out when tilting the converter.

The closest to the claimed invention in terms of technical essence is the laying of the joint of the converter lining, consisting of the lining of the lower part of the converter adjacent to each other and the lining of the bottom adjacent to it, a refractory rammed mass, which is made by molded refractory products with an alternating row shift along the front by a value of 0, 02-0.19 of the length of this brick with filling the gaps with a refractory ramming mass, while the molded refractory products have the shape of a parallelepiped [Patent RU 2642995, IPC C21C5/44, F27D1/00, 2018].

The disadvantage of this lining is the use of ramming mass with alternating refractory when joining the bottom and the likelihood of poor-quality sintering. In the future, the probability of falling out of these refractory materials also increases when converting the converter.

The technical result of the invention is the development of the construction of the laying of the walls and the bottom of the converter, which makes it possible to exclude the passage of metal during the smelting process, and also provides the possibility of installing blowing blocks for bottom blowing.

The specified technical result is achieved by the fact that the refractory masonry at the junction of the walls and the bottom of the converter contains a masonry of molded refractory products of the lower part of the converter and a masonry of molded refractory products of the converter bottom, as well as a refractory rammed mass, while the annular masonry of molded refractory products of the converter bottom is partially overlaps the butt joint between the body and the bottom of the converter, the distance between the molded refractory products of the lower part of the converter and the bottom of the converter is filled with a refractory ramming mass, above which there are two protective rows of molded refractory products, the end surfaces of which from the side of the walls of the converter have an angle of inclination of 25 - 60º with respect to to the converter vertical.

The thickness of the molded refractory products of the lower protective row is 1.1 - 2.2 of the thickness of the molded refractory products of the upper protective row.

The two protective rows of molded refractory products are closed from the outside with a refractory ramming mass.

Molded refractory products are made of reclase carbon.

The refractory ramming mass is made of pereklasocarbon.

At least one bottom lance is located at the bottom of the converter.

The essence of the technical solution.

Two protective rows of molded refractory products have an angle of inclination of 25 - 60º with respect to the converter vertical. This is due to the fact that when the lining is made with an angle in the range of 25 - 60º, a more enhanced bonding of the lining is achieved and the lining of the lining of the entire converter is strengthened.

The thickness of the molded refractory products of the lower protective row is 1.1 - 2.2 of the thickness of the molded refractory products of the upper protective row. When using refractory products of the lower protective row with a greater thickness of 1.1-2.2 of the thickness of the refractory products of the upper protective row, the risk of damage to the refractory brick at the beginning of operation when filling scrap is reduced. Reduces the risk of chipping, falling out of bricks, reduces wear, erosion.

When using these parameters (recommended slope angle and thickness) of the protective rows of the refractory masonry with their further filling with a refractory mass, a monolithic-strong refractory protection of the joint and a stronger bonding of the refractory products of the entire converter are obtained, which prevents the passage of metal into the butt part.

Also, the design of the lining is designed in such a way that it allows installing purge blocks for bottom blowing in the bottom of the converter.

The invention is illustrated by a drawing, which shows a section of the refractory masonry at the junction of the walls and the bottom of the converter:

1 - butt joint;

2 - overlapping with annular refractory masonry;

3 – channel for filling the bottom of the converter with refractory stuffing;

4 – refractory lining of the bottom of the converter;

5 - refractory ramming mass protective layer;

6 - two protective rows of molded refractory products (lower and upper row);

7 – purge blocks for bottom purge;

α - tilt angle 25 - 60º

Example

The refractory lining of the detachable bottom converter is made with a separation of operations. First, the converter body is lined. On a separate stand for lining the bottom, the bottom of the converter is lined. When docking the bottom with the converter body, the joint is displaced closer to the walls of the refractory masonry, while the joint is displaced, which leads to the separation of the joints and the overlap. Further, the filling of the joint is carried out by applying a pereklazouglerodisty ramming mass with the use of rammers.

The implementation of the claimed technical solution makes it possible to exclude the passage of metal in the process of steelmaking in the converter, thereby increasing the durability of the converter, reducing the consumption of materials for lining restoration and increasing metal production.

Claims (6)

1. Refractory masonry at the junction of the walls and the bottom of the converter, containing a masonry of molded refractory products of the lower part of the converter and a masonry of molded refractory products of the bottom of the converter, as well as a refractory rammed mass, characterized in that the annular masonry of molded refractory products of the bottom of the converter partially overlaps the butt joint between the body and the bottom of the converter, the distance between the molded refractory products of the lower part of the converter and the bottom of the converter is filled with a refractory ramming mass, above which there are two protective rows of molded refractory products, the end surfaces of which from the side of the walls of the converter have an angle of inclination of 25–60 ° with respect to the vertical converter. 2. Refractory masonry according to claim 1, characterized in that the thickness of the molded refractory products of the lower protective row is 1.1–2.2 of the thickness of the molded refractory products of the upper protective row. 3. Refractory masonry according to claim 1, characterized in that the two protective rows of molded refractory products are closed from the outside with a refractory ramming mass. 4. Refractory masonry according to claim. 1, characterized in that the molded refractory products are made of pereklasougler. 5. Refractory masonry according to claim 1, characterized in that the refractory ramming mass is made of pereklasougler. 6. Refractory masonry according to claim 1, characterized in that at least one bottom lance is located in the bottom of the converter.

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