RU2722949C2 - Lining of converter lower part with detachable bottom - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy, particularly, to oxygen converter with detachable bottom lining. Moulded refractory articles used in junction or gap masonry, have on one side angle of inclination of end surfaces on side of lower part of walls of converter α₁, equal to 0.5–25° and corresponding to angle of inclination of tangent α₂, drawn along extreme points of moulded refractory products in lower part of walls of converter, and on opposite side inclination angle of end surface α₃ adjacent to detachable bottom lining is equal to 0.5–25° and corresponding to inclination angle of extreme line α₄ of lining of lining bottom.

EFFECT: invention provides increased resistance of converter due to exclusion of metal penetration in process of steel melting into joint of refractory masonry of walls of converter and bottom.

4 cl, 2 dwg

Description

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

A well-known masonry scheme for a deep-sea converter, which contains a reinforcing and working layer. The reinforcing layer is made of fired high-quality refractory materials (magnesite, periclase spinelid or chromomagnesite brick) and is laid out with a thickness of 115 ... 230 mm. The working layer is made of non-fired refractories with a resin binder. Laying by the thickness of the working layer is usually made of two bricks (blocks) of various lengths. In the case of an attached bottom structure after its installation, the boundary of the connector is protected by one or more rings of periclase spinel bricks. [1] (Steel metallurgy: Textbook for high schools / Yavoysky V.I. et al .; M: Metallurgy, 1983, p. 511, 512)

The disadvantage of this design is that this technical solution is acceptable for converters with integral metal construction, however, it is impossible to use on converters with a detachable bottom.

There is a known masonry scheme for a deepwater converter, which consists of three layers of working, intermediate and reinforcing. The working layer is laid out from smolodolomitovyh bricks and blocks. The intermediate layer is stuffed from smolodolithic masses. The reinforcing layer is made of magnesite, magnesite-chromite or fired dolomite brick. The bottom of the converter is multi-layered. The lower rows are made of fireclay bricks, and the remaining rows of magnesite bricks on the edge and end. [2] (Sokolov G.A. Steel production. M., Metallurgy, 1982, p. 182, 189).

The disadvantage of this design is that this technical solution is acceptable for converters with integral metal construction, however, it is impossible to use on converters with a detachable bottom.

The closest solution to the invention is the joint design of the refractory lining of the converter with a removable bottom consisting of several layers laid out by refractory molded products [3] (Utility Model Patent of the Russian Federation, No. 139671, IPC ⁶ C21C 5/44, 2013).

The disadvantage of this design is that during the alternation of refractory products in the joint area, the thickness of the packing layer is insufficient for quality packing.

The objective of the invention is to increase the resistance of the converter, by eliminating the penetration of metal in the process of steel smelting into the joint of the refractory masonry of the walls of the converter and the bottom.

The problem is solved due to the fact that the lining of the converter with a removable bottom, containing a refractory lining of the lower part of the walls of the converter and the removable bottom of the converter in the form of a masonry of molded refractory products, while at the joints of the lining of the bottom of the walls of the converter and the lining of the removable bottom of the converter, the masonry is made molded refractory products, which, on the one hand, are adjacent to the lining of the removable bottom of the converter, and on the other hand, with a gap, on the lining of the lower part of the converter walls, and the gap formed between the said linings contains a packed refractory mass, the following differences are provided: molded refractory products used in masonry for a joint or gap, on the one hand, they have an angle of inclination of the end surfaces from the side of the lower part of the converter walls - α ₁ equal to 0.525 ° and corresponding to the angle of inclination of the tangent α ₂ 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 α ₃ adjacent to the lining of the removable bottom, equal to 0.5-25 °, and corresponding to the angle of inclination of the extreme row α _{4 of the} lining of the removable bottom.

In addition, the proposed lining of the converter with a detachable bottom is characterized in that a mortar or refractory adhesive composition is used between the masonry of the joint of the molded refractory products and the lining of the detachable bottom of the converter, and the molded refractory products from the ends contain chamfers of 0.1-20 mm., In addition the junction of the lining of the detachable bottom of the converter and the overlapping joint of the molded refractory products contains a packed refractory mass.

Thus, this technical solution meets the criterion of "novelty."

The analysis of patents and scientific and technical information did not reveal the use of new significant features used in the proposed solution. Therefore, the present invention meets the criterion of "inventive step".

The technical solution allows to increase the durability of the converter.

The essence of the proposed lining of the Converter with a removable bottom is illustrated in the drawing, on which:

FIG 1. is a General diagram of the junction of the lining of the Converter with a removable bottom;

FIG 2. is a diagram of a refractory product with an angle of inclination of the end surfaces to the vertical plane of 0.5-25 ° and an additional end facet of 0.1-20 mm

The proposed lining of the converter with a detachable bottom consists of a lining of the detachable bottom 1, the masonry of the joint or gap 2 molded refractory products, the lining of the lower part of the walls of the Converter 3, the refractory packing material 4, the stuffed refractory mass 6, and the refractory product has: the angle of inclination of the end surface from the side the lower part of the walls of the converter (3) -α ₁ equal to 0.5-25 ° and corresponding to the angle of inclination of the tangent α ₂ drawn along the extreme points of the molded refractory products in the lower part of the walls of the converter (3); and on the opposite side, the angle of inclination of the end surface α ₃ adjacent to the lining of the removable bottom (1), equal to 0.5-25 °, and corresponding to the angle of inclination of the extreme row α _{4 of the} lining of the removable bottom (1), in addition from the ends of the molded refractory products made of chamfers 5 with a size of 0.1-20 mm.

The implementation of the invention.

The refractory lining of the converter with a removable bottom is performed with a separation of operations. First, lay the walls in their own converter to the bottom of the cone of the converter 3. Then separately open the latching detachable bottom 1 of the converter. After that, the casing parts are connected and the resulting gap between the lining of the detachable bottom 1 and the lining of the lower part of the converter walls is filled with masonry of the joint 2, for example, of molded refractory products with the addition of refractory packing material 4 from the lining of the lower part of the walls of the converter 3, provided that molded refractory products are used used in masonry of joint 2 with the angle of inclination of the end surfaces from the lining of the lower part of the walls of the converter 3 - α ₁ equal to 0.5-25 ° and corresponding to the angle of inclination of the extreme row of the masonry of the lining of the removable bottom 1 and the angle of inclination of the tangent drawn at the extreme points of the molded refractory products in the lower part of the walls of the converter α _4, α ₂ . The pairing between the lining of the detachable bottom 1 and the overlapping masonry for the masonry joint of the molded refractory products 2 is filled with a printed refractory ramming mass 6.

The offset of the masonry of the joint or gap of the molded refractory products 2 to the lining of the removable bottom 1 provides an additional overlap of the refractory products 2 of the joint of the lining of the lower part of the walls of the converter 3 and the lining of the removable bottom 1 equal to 0.5-20 °. The angle of inclination of the end surface of the refractory products α ₃ adjacent to the lining of the removable bottom 1 corresponding to the angle of inclination of the extreme row α _{4 of the} lining of the removable bottom 1 will ensure their tight fit. The absence of gaps will ensure reliable operation of the joint lining. If the angles α ₃ and α ₄ do not match in the range of 0.5–25 °, it will lead to difficulty in joining the lining of the detachable bottom 1 with the lining of the lower part of the walls of the converter 3, increase the lining time and worsen working conditions, and will additionally transfer the packing zone of the refractory mass 4 to the periphery of the converter.

A mortar or a refractory adhesive composition (not shown in Figs. 1 and 2) is used between the masonry of the joint or gap of the molded refractory products 2 and the lining of the detachable bottom 1 (see FIGS. 1 and 2), because these materials will ensure reliable operation of the converter joint masonry due to the absence of metal penetration.

At the ends, the surface of the refractory products is made of chamfers 5 with a size of 0.1-20 mm.

In the absence of 2 chamfers 5 from the ends on the molded refractory products, it will chamfer the edges of the end part of the molded refractory products, thereby violating the integrity of the molded refractory product, which will lead to increased wear. To exclude chips on the end of the refractory product, a chamfer 5 of a depth of 0.1-20 mm is made.

The use of refractory packing material 6 at the junctions of the lining of the removable bottom 1 and overlapping the masonry 2 for the joint or gap of the molded refractory products 2 will reduce the wear of the converter joint at the initial stage of operation.

The proposed Lining of the lower part of the converter with a removable bottom allows to increase the resistance of the converter by eliminating the penetration of metal during steelmaking into the joint of the refractory masonry of the walls of the converter and the bottom, the service life of the bottom tuyeres of the converter.

Sources of information

[1] Steel metallurgy: Textbook for high schools / Yavoysky V.I. and etc.; M .: Metallurgy, 1983, p. 511, 512.

[2] Sokolov G.A. Steel production. M., Metallurgy, 1982, p. 182, 189.

[3] (Patent for a utility model of the Russian Federation, No. 139671, IPC ⁶ C21C 5/44, 2013).

Claims (4)

1. The lining of the converter with a removable bottom, containing a refractory lining of the lower part of the walls of the converter and the removable bottom of the converter in the form of a masonry of molded refractory products, while in the joints of the lining of the lower part of the walls of the converter and the lining of the removable bottom of the converter, the masonry was molded with refractory products on one side it is adjacent to the lining of the removable bottom of the converter, and on the other hand, with a gap to the lining of the lower part of the walls of the converter, the gap formed between the said linings contains a packed refractory mass, characterized in that the molded refractory products used in the masonry for a 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 α ₁ equal to 0.5-25 ° and corresponding to the angle of inclination of the tangent α ₂ drawn at the extreme points of the molded refractory products in the lower part of the walls of the converter, and on the opposite side, the angle of inclination end face spacing α ₃ adjacent to the lining of the removable bottom, equal to 0.5-25 ° and corresponding to the angle of inclination of the extreme row α _{4 of the} lining of the removable bottom. 2. The lining according to claim 1, characterized in that between the masonry of the joint molded refractory products and the lining of the detachable bottom of the Converter use a mortar or refractory adhesive composition. 3. The lining according to claim 1, characterized in that from the ends of the molded refractory products, chamfers of 0.1-20 mm are made. 4. The lining according to claim 1, characterized in that the interface between the lining of the detachable bottom of the converter and the overlapping joint of the molded refractory products contains a packed refractory mass.

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