CN110860681A - Continuous casting coating tundish spraying method - Google Patents
Continuous casting coating tundish spraying method Download PDFInfo
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- CN110860681A CN110860681A CN201911050198.3A CN201911050198A CN110860681A CN 110860681 A CN110860681 A CN 110860681A CN 201911050198 A CN201911050198 A CN 201911050198A CN 110860681 A CN110860681 A CN 110860681A
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- coating
- tundish
- spraying
- permanent layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A method for spraying a continuous casting coating tundish, belonging to the technical field of ferrous metallurgy. The method comprises the following steps: turning the tundish after the continuous casting coating tundish is offline for 8-16 h; checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use; spraying a coating on the permanent layer with the temperature of 100-1000 ℃, naturally cooling the permanent layer in the spraying process and after the spraying, wherein the coating is a mixture of a dry spraying material and water, the water content in the coating is less than or equal to 18 wt%, and the thickness of the coating, namely the working layer, is 50-100 mm; and baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 h, and finishing the spraying process after the working layer is hardened. The method reduces the gas consumption in the prior art, reduces the water content of the coating tundish, accelerates the turnover of the tundish, and ensures that the coating is quickly bonded and does not fall off after being sprayed.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a tundish spraying method of a continuous casting coating.
Background
The tundish is an indispensable mechanical device of a continuous casting system, not only plays a role of a buffer between a ladle and a crystallizer, but also can refine molten steel and remove non-metallic inclusions in the molten steel. As terminal equipment for refining molten steel, a refractory lining used for a tundish is required to have long service life and clean. Referring to fig. 1, the inner lining of the tundish is divided into a permanent layer 1 and a working layer 2. The thickness of the permanent layer 1 is generally 100-200 mm, the layer is in contact with the heat insulation layer and mainly plays a role in safety heat insulation, and the permanent layer 1 is generally a refractory brick or a casting material lining. The thickness of the working layer 2 is generally 50-100 mm, and the layer is in contact with molten steel and is a key part. The typical tundish has the following requirements on the performance of the refractory material used for the working layer: the construction is simple and convenient, the adhesion with the permanent layer is good, and the falling and collapse cannot occur; after construction, the working layer has no crack at normal temperature and is not cracked after being baked; in the using process, the corrosion resistance and the infiltration capacity of molten steel and slag are strong; the disintegration performance is excellent after use, and the ladle turning and the slag shell cleaning are easy; has good heat preservation performance. The existing working layer is generally a paint layer.
Generally, a spraying machine is adopted to carry out spraying construction on the permanent layer of the tundish, and the operation is carried out according to the principle of a premixing method. Before construction, the bagged dry spray material is mixed and loaded into a hopper, a pointed large-cone iron nail is arranged in the hopper, the bag is automatically cut, and the dry material falls into the hopper. The horizontal stirrer at the bottom of the hopper consists of a metering part and a stirring part, the stirring part is used for stirring the spray paint and added water (the water supply amount is regulated and controlled by an adjustable flow meter), the stirred slurry falls into a slurry container, the slurry is pressed into a spray gun by a screw pump through a slurry conveying pipe, and then the slurry is sprayed out from a nozzle by compressed air, so that the slurry can be uniformly sprayed on the surface of a permanent layer of the tundish as required.
In the process of building the tundish, in order to ensure that a mixture of a dry spraying material and water can be adhered to the wall (namely a permanent lining) of a permanent layer of the tundish and dried as soon as possible, the tundish after being off-line is turned over the next day (until the residual steel and slag in the tundish are completely cooled) in the original method, then the permanent layer of the tundish after being off-line is baked for 4-8 hours at the temperature of 200-500 ℃, and then the permanent layer is sprayed, so that the building time of the tundish is prolonged, the turnover of the tundish is influenced, and the consumption of coal gas for baking is increased.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides a continuous casting coating tundish spraying method which has the advantages of reducing gas consumption, quickly preventing coating from bonding and falling after spraying, shortening the tundish turnover time and the like.
The technical scheme is as follows: a continuous casting coating tundish spraying method is characterized in that a continuous casting coating tundish is a tundish to be turned after being off-line after work, and the method comprises the following steps:
step one, turning a tundish for 8-16 hours after the tundish of the continuous casting coating is offline;
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use;
step three, spraying a coating on the permanent layer with the temperature of 100-;
and step four, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours, and finishing the spraying process after the working layer is hardened.
Preferably, the dry spray paint in the third step is a medium package spray paint with the product number of 020200A-2, which is produced by Jiangsu Jia high temperature resistant materials GmbH.
Preferably, in the third step, the permanent layer with the temperature of 150-300 ℃ is sprayed with the coating.
Preferably, the coating is sprayed in the third step until the thickness of the coating is 10-20 mm, the water in the coating is evaporated by using the temperature of the permanent layer, and after the coating becomes hard, the coating is continuously sprayed until the thickness of the coating is 50-100 mm, namely the thickness of the working layer.
Preferably, in the third step, a spray gun is used for spraying the coating on the permanent layer with the temperature of 100-1000 ℃.
Has the advantages that: according to the invention, the ratio of the coating to the water is strictly controlled, the coating is turned and sprayed after the tundish is taken off 8-16 hours, and the water in the coating is evaporated by using the afterheat of the tundish which is taken off the line, so that the aim of baking the coating is achieved, and the method reduces the gas consumption (saving 300 m per hour) in the existing method3) And the water content of the coating tundish is reduced, and the turnover of the tundish is accelerated.
Drawings
FIG. 1 is a simplified diagram of a tundish lining.
The numerical designations in the drawings represent the following: 1. a permanent layer; 2. and a working layer.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
A continuous casting coating tundish spraying method is characterized in that a continuous casting coating tundish is a tundish to be turned after being off-line after work, and the method comprises the following steps:
step one, turning a tundish after the tundish of the continuous casting coating is offline for 8 hours;
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use;
spraying a coating on the permanent layer at the temperature of 1000 ℃, naturally cooling the permanent layer during and after spraying, wherein the coating is a mixture of a dry spraying material and water, the water content in spraying is 18 wt.%, and the thickness of the coating, namely the thickness of a working layer, is 50-100 mm (different requirements of tundish positions are different);
and step four, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours, and finishing the spraying process and putting the coating into use after the working layer is hardened.
Example 2
A continuous casting coating tundish spraying method is characterized in that a continuous casting coating tundish is a tundish to be turned after being off-line after work, and the method comprises the following steps:
step one, turning a tundish after the tundish of the continuous casting coating is offline for 16 hours;
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use;
spraying a coating on the permanent layer with the temperature of 100 ℃, wherein the permanent layer is naturally cooled during and after the spraying, the coating is a mixture of a dry spraying material and water, the water content in the spraying is 10 wt.%, and the thickness of the coating, namely the thickness of a working layer, is 50-100 mm (different requirements of tundish positions are different);
and step four, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours, and finishing the spraying process and putting the coating into use after the working layer is hardened.
Example 3
The continuous casting coating tundish is a tundish which is ready to be turned after being taken off line after work, the tundish stops being poured and taken off line after high-temperature (more than 1500 ℃) molten steel is poured for a long time, and at the moment, the integral refractory material of the tundish is higher in temperature and is gradually cooled.
The continuous casting coating tundish spraying method comprises the following steps:
step one, turning the tundish after 8 hours after the tundish of the continuous casting coating is taken off line, primarily solidifying the residual steel slag after the tundish is taken off line for 8 hours, and turning the residual steel slag and the working layer in the tundish (namely turning the tundish);
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use;
spraying a coating on the permanent layer at the temperature of 300 ℃ by using a spray gun, naturally cooling the permanent layer in the spraying process and after spraying, wherein the coating is a mixture of a dry spraying material and water, the water content in the spraying is 18 wt.%, the coating is sprayed until the thickness of the coating is 10-20 mm (the positions of tundishes are different in requirements), the water in the coating is quickly evaporated by using the height of the permanent layer, the coating begins to harden, the strength is increased, then, the coating is continuously sprayed until the thickness of the coating is 50-100 mm (the positions of the tundishes are different in requirements), and the dry spraying material is a product number 020200A-2 tundish spraying material produced by Jiangsu Jia high temperature resistant materials Co., Ltd;
and step four, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours to ensure that the moisture in the coating is fully evaporated by using the waste heat, and finishing the spraying process and putting the coating into use after the working layer is hardened.
Example 4
The continuous casting coating tundish is a tundish which is ready to be turned after being taken off line after work, the tundish stops being poured and taken off line after high-temperature (more than 1500 ℃) molten steel is poured for a long time, and at the moment, the integral refractory material of the tundish is higher in temperature and is gradually cooled.
The continuous casting coating tundish spraying method comprises the following steps:
step one, turning the tundish after 16 hours after the tundish of the continuous casting coating is taken off line, primarily solidifying the residual steel slag after the tundish is taken off line for 16 hours, and turning the residual steel slag and the working layer in the tundish (namely turning the tundish);
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the requirement of continuous use;
spraying a coating on the permanent layer at the temperature of 150 ℃ by using a spray gun, naturally cooling the permanent layer in the spraying process and after spraying, wherein the coating is a mixture of a dry spraying material and water, the water content in the spraying is 18 wt.%, the coating is sprayed until the thickness of the coating is 10-20 mm (the positions of tundishes are different in requirements), the water in the coating is quickly evaporated by using the height of the permanent layer, the coating begins to harden, the strength is increased, then, the coating is continuously sprayed until the thickness of the coating is 50-100 mm (the positions of the tundishes are different in requirements), and the dry spraying material is a product number 020200A-2 tundish spraying material produced by Jiangsu Jia high temperature resistant materials Co., Ltd;
and fourthly, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours to ensure that the moisture in the coating is fully evaporated by using the waste heat, finishing the spraying process after the working layer is hardened and putting the coating into use, and quickly bonding the coating without falling off after spraying.
Claims (5)
1. A continuous casting coating tundish spraying method is characterized in that the method comprises the following steps:
step one, turning a tundish for 8-16 hours after the tundish of the continuous casting coating is offline;
checking the condition of the permanent layer after the ladle turning, and detecting the surface temperature of the permanent layer if the condition of the permanent layer meets the use requirement of continuous work;
step three, spraying a coating on the permanent layer with the temperature of 100-;
and step four, baking the coating by using the temperature of the permanent layer, standing the permanent layer after the working layer is sprayed for 24 hours, and finishing the spraying process after the working layer is hardened.
2. The continuous casting coating tundish spraying method according to claim 1, wherein the dry spraying material in the third step is a tundish spraying material manufactured by Jiangsu Jia refractory material Co., Ltd, and the product number is 020200A-2.
3. The method for spraying the continuous casting paint tundish according to claim 1, wherein the permanent layer with the temperature of 150-300 ℃ is sprayed in the third step.
4. The continuous casting coating tundish spraying method according to claim 1, wherein the coating is sprayed in the third step until the thickness of the coating is 10-20 mm, the water in the coating is evaporated by using the temperature of the permanent layer, and after the coating becomes hard, the coating is continuously sprayed until the thickness of the coating, namely the thickness of the working layer, is 50-100 mm.
5. The method for spraying the continuous casting coating tundish according to claim 1, wherein the permanent layer with the temperature of 100-1000 ℃ is sprayed by a spray gun in the third step.
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| CN201911050198.3A CN110860681A (en) | 2019-10-31 | 2019-10-31 | Continuous casting coating tundish spraying method |
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| CN201911050198.3A CN110860681A (en) | 2019-10-31 | 2019-10-31 | Continuous casting coating tundish spraying method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113000805A (en) * | 2021-02-23 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Production method for increasing continuous casting furnace number of billet continuous casting machine |
| CN115156514A (en) * | 2022-06-17 | 2022-10-11 | 建龙北满特殊钢有限责任公司 | Continuous casting tundish building method |
| CN115466126A (en) * | 2022-08-17 | 2022-12-13 | 南京钢铁股份有限公司 | Isolation material beneficial to turning of tundish |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113000805A (en) * | 2021-02-23 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Production method for increasing continuous casting furnace number of billet continuous casting machine |
| CN115156514A (en) * | 2022-06-17 | 2022-10-11 | 建龙北满特殊钢有限责任公司 | Continuous casting tundish building method |
| CN115466126A (en) * | 2022-08-17 | 2022-12-13 | 南京钢铁股份有限公司 | Isolation material beneficial to turning of tundish |
| CN115466126B (en) * | 2022-08-17 | 2023-04-11 | 南京钢铁股份有限公司 | Isolation material for turning tundish |
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Application publication date: 20200306 |
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