RU2791945C1 - Section for treatment of liquid metal with gases - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: treatment of steel with inert gases in order to homogenize and refine from non-metallic inclusions and dissolved gases. The section for processing liquid metal with gases contains elements (6) made of refractory material, interconnected by mounting or packaging tape (8) made of organic material. Film (7) is placed between the elements of section (4) over the entire area of their contact, forming capillaries between the said elements when the section is heated.

EFFECT: ensuring the strength of the lining of the ladle for pouring steel while increasing the efficiency of gas supply to liquid metal by increasing the area of capillaries and preventing clogging of capillaries during the manufacture of the section.

2 cl, 2 dwg, 1 ex

Description

The invention relates to ferrous metallurgy and can be used in the treatment of steel with inert gases for the purpose of its homogenization and refining from non-metallic inclusions and dissolved gases.

A section for metal gas treatment is known (patent for the invention of Ukraine No. 35356, IPC B22D 41/00, publ. 09/10/2008), made of separate elements, tied together by a wire wrapped around the section, between which there are through slot-like capillary holes , formed by the gap between the elements, formed due to the protrusions 0.220-170 mm high.

The disadvantages of this invention is the use of wire as a tightening element, which leads to a deterioration in the quality of the section. In addition, the capillary holes for the gas outlet are formed by protrusions located on the elements, which leads to the ingress of cement laitance into the side slots when pouring refractory concrete. The maximum thickness of the capillary should not exceed 0.2 mm, since with a larger thickness, the liquid metal freely enters the hole, which leads to disruption of the section.

The closest analogue is the section for processing liquid metal with gases (Ukrainian utility model patent No. 93174 MPK C21C 7/072, C21C 5/48, I22V1 / 00bI22V 41/00 opbul. 10.01.2011), made of separate elements connected between each other with a coupler, between which there are capillary holes for gas outlet. Capillary openings for gas outlet have at least two separate separators located between the elements at their opposite edges. The section has at least one longitudinal through hole located at the distance of maximum wear from the upper edge of the section, and the coupler is made in the form of a mounting rod located in this hole. In addition, the side surfaces of the section have a sealing coating.

The disadvantages of this model are a significant change in the length of the metal mounting rods when heated, as well as the presence of at least two separate separators to obtain capillary holes located between the elements at their opposite edges. And also, during pouring with refractory concrete, cement milk gets into the side cracks, which leads to blocking the passage of gas into the liquid metal.

The problem to be solved by the claimed invention is to prevent cyclic stresses in the concrete monolith of the lining of a metallurgical vessel, clogging and blockage of capillaries when liquid concrete enters and its blockage during installation and concreting.

The technical result achieved by using the present invention is to maintain the strength of the ladle lining for pouring steel and increase the efficiency of gas supply to the melt.

The technical result is achieved due to the section for processing liquid metal with gases, containing elements of refractory material interconnected by a coupler, while between the elements of the section over the entire area of their contact there is a capillary-forming film that forms capillaries during heating, and the elements of the section are interconnected by a mounting or packaging tape made of organic material.

The invention is further illustrated by the following drawings:

Fig.1. General view of the bucket assembly.

Fig.2. General view of the section elements.

The system for supplying gas to the steel-pouring ladle 1 includes a gas pipeline 2, a collector 3, sections 4 for supplying gas to the melt, equipped with capillaries, and a collector box 5 connected via a pipeline with a purge block consisting of sections 4 for supplying gas to the melt.

Sections 4 for supplying gas to the melt consist of elements 6, each of which is a plate of refractory material, the size of which depends on the height of the melt column and on the thickness of the working layer. The choice of refractory material for section elements depends on the melt temperature and on the load that falls on the section element.

For the manufacture of elements, technologies for the manufacture of pressed products can be applied, for example, bricks of different grades, or other shaped products.

More preferable is the production of elements 6 from refractory concrete, for example, manufactured by RATH (Austria), SBS IDUSTRIAL SOLUTIONS GMBH REFSUD (France), GEOINSERTE REFRACTTORIES (Portugal), OST (Russia).

In a particular case, the size of the refractory plate may vary (120-150) * (20-80) * (300-400) mm.

Between elements 6 of section 4 there is a capillary film 7 made of polymeric material, 0.1 - 0.2 mm thick over the entire contact area of the elements and preventing the penetration of cement laitance into the capillary space.

In a particular case, the film thickness depends on the ferrostatic pressure. The higher the pressure, the smaller the capillary must be.

Sections 4 for supplying gas to the melt are interconnected by a coupler 8.

In a particular case, the screed can be made with a material such as a container non-metallic tape or packing tape. Packing tape is wrapped with an interference fit in 3 - 4 layers, which is enough to securely fix the section structure during transportation and installation of the purge unit.

An example of the invention:

Sections 4 consist of twelve elements 6 with a size of 150 * 40 * 300 mm. A polyethylene film 7 with a thickness of 0.2 mm is laid between the elements over the entire area of the element 6. The elements of the section are mounted in a jig consisting of guides that allow you to install the element of the section 6 exactly on the seat, docking the elements together.

After the installation of sections 4 is completed, it is pulled together with a mounting polypropylene tape 8 in three layers.

After installation in the collector box 5 sections 4, pour the working layer of the lining. Ladle 1 is fed for drying, as a result of which the capillary-forming film 7 burns out, while the capillaries open. This process begins during drying and ends when the ladle 1 is heated for melting. After that, the ladle 1 is fed under the liquid metal drain.

The advantages of the claimed invention lie in maintaining the strength of the lining due to the exclusion of metal structural elements and increasing the efficiency of gas supply to the melt when using sections by increasing the area of the purge capillaries and preventing clogging of the capillaries due to the laying of the capillary film over the entire contact area of the elements, which prevents the penetration of cement laitance into the capillary space.

Claims (2)

1. Section for processing liquid metal with gases, containing elements of refractory material interconnected by a coupler, characterized in that a capillary film is placed between the elements of the section over the entire area of their contact, which forms capillaries during heating, and the elements of the section are interconnected by a mounting or packing tape made of organic material. 2. Section according to claim 1, characterized in that the elements of the section are made in the form of concrete plates.

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