CN114213111B

CN114213111B - Aluminum-carbon immersion nozzle for accidents and preparation method

Info

Publication number: CN114213111B
Application number: CN202111657200.0A
Authority: CN
Inventors: 李志义; 张程; 吴比; 王蕊; 潘志鹏; 王琼
Original assignee: Anshan He Feng Refractory Material Co ltd
Current assignee: Anshan He Feng Refractory Material Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-08-11
Anticipated expiration: 2041-12-30
Also published as: CN114213111A

Abstract

The invention relates to an accident-used aluminum-carbon water inlet and a preparation method thereof. The beneficial effects of the invention are as follows: the invention provides an accident-used aluminum-carbon water inlet and a preparation method thereof, which are specially used for temporarily replacing and using when the accident happens to the water inlet, are free from baking, are convenient to use and can ensure safe and smooth production.

Description

Aluminum-carbon immersion nozzle for accidents and preparation method

Technical Field

The invention relates to the technical field of metallurgical refractory products, in particular to an accident-used aluminum-carbon water immersion nozzle and a preparation method thereof.

Background

In use, the submerged entry nozzle for continuous casting inevitably has various problems, and when problems occur, if no replaceable nozzle exists, great difficulty is caused to the production of customers. And baking is needed before the wire is put on the common immersion nozzle, and the baking time is different from 45 to 90 minutes. If the steel is directly wound without baking, the problems of water gap fracture, explosion, perforation, cold steel wall hanging and flow blockage and the like are likely to be caused due to the heat stability problem.

The prior art has the defects that:

1) The existing baking-free immersion nozzle has high manufacturing cost and complex procedures.

2) The existing baking-free immersed nozzle can inevitably cause the occurrence of the condition of the gellan steel when not baked, thereby causing the blockage of flow.

3) The non-baking-free submerged nozzle cannot be replaced in time when an accident occurs, and continuous accidents are easy to cause after replacement.

Disclosure of Invention

The invention provides an accident-used aluminum-carbon water inlet and a preparation method thereof, which are specially used for temporarily replacing and using when the accident happens to the water inlet, are free from baking, are convenient to use and can ensure safe and smooth production.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

the utility model provides an aluminium carbon immersion water mouth for accident, includes face, inside lining, body, the inside lining is at the body inboard, the face is in the upper end of inside lining and body, the inside lining is two-layer, and the inlayer is the thermite layer, and the skin is no carbon mud material layer.

The body material comprises the following components in parts by weight: 30-55 parts of brown corundum, 28-18 parts of graphite, 8-18 parts of fused quartz, 4-14 parts of alumina micropowder, 1-5 parts of metal silicon powder, 0.5-4 parts of boron carbide and 19-29 parts of bonding agent. The binder is 10-20 parts of solid resin powder and 9 parts of liquid resin.

The panel material comprises the following components in parts by weight: 30-65 parts of white corundum, 10-20 parts of graphite, 10-30 parts of fused quartz, 5-15 parts of alumina micropowder, 0.1-3 parts of silicon carbide, 0.5-5 parts of boron carbide, and 5-20 parts of resin powder and liquid resin.

The carbon-free mud layer comprises the following materials in parts by weight: 40-50 parts of fused quartz, 20-40 parts of floating beads, 15-30 parts of alumina hollow spheres and 5-20 parts of phenolic resin.

The preparation method of the accident aluminum carbon water immersion nozzle comprises the following steps:

1) Firstly, preparing a lining, putting a layered pipe between a lining core die and a lining core die, adding a thermite between the layered pipe and the lining core die, adding a carbon-free mud material between the layered pipe and the lining core die, taking out the layered pipe, and forming at a low pressure of 50-70 MPa;

2) After the production of the lining is finished, the integral molding is carried out, after the external mold is assembled, the lining is put into the middle core mold, then the plate fabric and the body material are sequentially put into the middle core mold, and finally the molding is carried out by using 90-130 MPa.

3) And baking and curing the molded semi-finished product for 12-24 hours by using an electric heating drying kiln at 200-270 ℃, taking out after curing, and putting the semi-finished product into a hood kiln for sintering treatment.

Compared with the prior art, the invention has the beneficial effects that:

the invention is specially used for temporarily replacing and using when the water gap has accidents, is free from baking, is convenient to use, and can ensure safe and smooth production.

The slag line is eliminated because the invention does not need to be used for a long time. Considering the problem of erosion of the protective slag, the product strengthens the erosion resistance of the body to the protective slag, namely, the granularity ratio of pug is integrally reduced under the condition of ensuring the thermal stability, the density of the body is improved, and the addition amount of silicon carbide and boron carbide is increased.

Because the invention is used for temporary standby in accidents, baking-free wire feeding is needed, and in order to prevent the problem of cold steel after the wire feeding at a room temperature water gap, the thermite layer for thermite reaction is added in the innermost layer of the lining, and the reaction temperature is reached when molten steel passes through an inner cavity, heat is released, and the condensation of the cold steel is further reduced.

The invention has simple structure, low cost, no baking and quick line-up, can quickly solve the accident of water ports, and ensures the safe and smooth production.

Drawings

FIG. 1 is a schematic view of an accident-use alumina-carbon immersion water port structure in the present invention.

Fig. 2 is an enlarged view of point I in fig. 1.

In the figure: 1-body, 2-carbon-free mud layer, 3-plate surface and 4-thermite layer.

Detailed Description

The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:

referring to fig. 1-2, an accident alumino-carbon water inlet comprises a plate surface 3, a lining and a body 1, wherein the lining is arranged on the inner side of the body 1, the plate surface 3 is arranged at the upper ends of the lining and the body 1, the lining is formed by two layers, the inner layer is a thermite layer 4, and the outer layer is a carbon-free mud layer 2.

Example bulk materials are shown in table 1; example panel materials are shown in table 2; examples the materials of the carbon-free mud layer are shown in table 3.

Table 1 examples example bulk materials

Raw materials	Example 1 (parts)	Example 2 (parts)	Example 3 (parts)	Example 4 (parts)
					From 36 ^# 、80 ^# Brown corundum formed by F180 granularity	31	40	45	50
+895, -198 graphite	19	25	26	23
					Fused silica	10	15	17	25
Alumina micropowder	5	10	12	9
					98 metal silicon powder	2	3	5	4
Boron carbide	1	3	3.5	2
					Binding agent	20	25	24	26

Table 2 example panel materials

Raw materials	Example 1 (parts)	Example 2 (parts)	Example 3 (parts)	Example 4 (parts)
					White corundum	35	45	60	50
+898, -198 graphite	12	15	18	13
					Fused silica	11	16	28	25
Alumina micropowder	6	13	14	8
					Silicon carbide	2.5	3	0.5	0.9
Boron carbide	3.5	2	4.5	3
					Resin powder and liquid resin	6	18	15	10

Table 3 example carbon-free pug layer materials

The preparation method of the aluminum-carbon water immersion nozzle for accident comprises the following steps:

1) Preparing pug: after the ingredients are mixed and the mixture is kept static for 24 hours in a constant temperature and humidity material warehouse, a forming step is carried out in a constant temperature and humidity workshop;

2) Firstly, preparing a lining, putting a layered pipe between a lining core die and a lining core die, adding a thermite between the layered pipe and the lining core die, adding a carbon-free mud material between the layered pipe and the lining core die, taking out the layered pipe, and forming under a low pressure of 70 MPa;

3) After the production of the lining is finished, the integral molding is carried out, after the external mold is assembled, the lining is put into the middle core mold, then the plate fabric and the body material are sequentially put into the middle core mold, and finally the molding is carried out under 110 MPa.

4) And baking and curing the molded semi-finished product for 16 hours by using an electric heating drying kiln at 250 ℃, taking out after curing, and putting the semi-finished product into a hood kiln for sintering treatment.

5) And (3) carrying out driving processing, coating an antioxidant coating and coating fire-resistant cotton on the sintered product, and then completing all the working procedures.

Claims

1. The aluminum-carbon water inlet for accidents is characterized by comprising a plate surface, a lining and a body, wherein the lining is arranged on the inner side of the body, the plate surface is arranged at the upper ends of the lining and the body, the lining is two layers, the inner layer is a thermite layer, and the outer layer is a carbon-free mud layer;

the body material comprises the following components in parts by weight: 30-55 parts of brown corundum, 28-18 parts of graphite, 8-18 parts of fused quartz, 4-14 parts of alumina micropowder, 1-5 parts of metal silicon powder, 0.5-4 parts of boron carbide and 19-29 parts of bonding agent;

2. An accident aluminium carbonaceous submerged nozzle according to claim 1, wherein the sheet material comprises, in parts by weight: 30-65 parts of white corundum, 10-20 parts of graphite, 10-30 parts of fused quartz, 5-15 parts of alumina micropowder, 0.1-3 parts of silicon carbide, 0.5-5 parts of boron carbide, and 5-20 parts of resin powder and liquid resin.

3. A method of manufacturing an accident aluminium carbonaceous submerged nozzle according to any one of claims 1 or 2, comprising the steps of:

preparing pug: after the ingredients are mixed and the mixture is kept in a constant temperature and humidity material warehouse for 24 hours, a forming step is carried out in a constant temperature and humidity workshop;

2) After the production of the lining is finished, carrying out integral molding, after the external mold is assembled, putting the lining on the middle core mold, then sequentially putting the plate fabric and the body material, and finally molding by using 90-130 MPa;