阅读说明：本技术 一种保障钢包底吹氩精炼效果的方法 (Method for guaranteeing refining effect of ladle bottom argon blowing ) 是由 唐建平 麻晓光 张达先 云霞 郝振宇 王鹏飞 刁望才 于 2020-04-07 设计创作，主要内容包括：本发明公开了一种保障钢包底吹氩精炼效果的方法,通过“阻断负压,一洗四吹”的操作方法,贯穿冶金生产过程,从细节处入手,有效防止漏钢、粘钢等现象,保证底吹氩精炼效果,能适应多种钢包底吹设备系统。具有极大的推广意义。(The invention discloses a method for guaranteeing the refining effect of ladle bottom blowing argon, which effectively prevents the phenomena of bleed-out, steel sticking and the like from details through the operation method of blocking negative pressure and washing four times through the metallurgical production process, ensures the refining effect of bottom blowing argon and can adapt to various ladle bottom blowing equipment systems. Has great popularization significance.)

1. A method for guaranteeing the refining effect of ladle bottom blowing argon is characterized by comprising the steps of blocking negative pressure and washing and blowing four times; wherein:

the negative pressure blocking is realized by utilizing an airflow non-return device below the air brick to prevent the negative pressure generated when the gas flows out when the argon is closed;

the first washing is to clean the surface steel of the air brick by oxygen;

the four blows are respectively: blowing argon in a trial mode before a furnace front seat tank, and checking the air permeability of the air brick; during tapping, argon is blown in the whole process, so that the crack of the air brick is prevented from being infiltrated with metal and nonmetal substances; soft blowing is carried out after refining is in place, the steel coagulation phenomenon caused by temperature drop on the surface of the air brick is prevented, and the smoothness of argon blowing is ensured; and after the steel ladle is unloaded from the casting machine, carrying out back flushing immediately to ensure that foreign matters are not condensed on the surface of the air brick after liquid slag is turned out.

2. The method for guaranteeing the refining effect of the ladle bottom blowing argon according to the claim 1, is characterized by comprising the following specific operation steps:

s1: when the steel ladle enters a steel ladle preparation area for treatment, the head of the air brick is burnt and washed when the steel ladle is condensed and cooled, and test blowing is carried out simultaneously to determine the air permeability of the air brick, so that the next procedure can be carried out after the problem is found out to be solved;

s2: in the tapping process before the furnace, argon is blown in the whole process, so that metal and nonmetal liquid with low melting point and low surface tension are prevented from permeating into a gap of the air brick;

s3: after the ladle is in place for refining, argon is immediately communicated for soft blowing, the phenomenon of steel solidification at the head of the air brick caused by the reduction of the temperature of the ladle bottom in the period of waiting for refining is prevented, and the argon is ensured to be always smooth;

s4: immediately connecting high-pressure nitrogen after the ladle is discharged from the casting machine, carrying out back flushing, and blow-drying and pouring out residual substances before the residual substances are not solidified;

s5: when argon is closed, the negative pressure effect generated when the gas flows out is prevented by the airflow non-return device below the air brick.

Technical Field

The invention relates to the technical field of steel making, in particular to a method for guaranteeing the refining effect of ladle bottom argon blowing.

Background

The ladle bottom argon blowing refining is an important process flow in the smelting process, influences important indexes such as molten steel cleanliness, molten steel composition, temperature uniformity and the like, and is directly related to whether a casting machine can smoothly produce qualified high-quality steel billets. Therefore, ensuring good state and continuous supply of the bottom blowing argon effect is an important task in the smelting process.

Disclosure of Invention

The invention aims to provide a method for guaranteeing the refining effect of ladle bottom blowing argon, which effectively prevents the phenomena of steel leakage, steel adhesion and the like from details through the operation method of blocking negative pressure and washing four times through the metallurgical production process, ensures the refining effect of bottom blowing argon and can adapt to various ladle bottom blowing equipment systems.

In order to solve the technical problems, the invention adopts the following technical scheme:

a method for guaranteeing the refining effect of ladle bottom blowing argon comprises the steps of blocking negative pressure and washing and blowing; wherein:

the negative pressure blocking is realized by utilizing an airflow non-return device below the air brick to prevent the negative pressure generated when the gas flows out when the argon is closed;

the first washing is to clean the surface steel of the air brick by oxygen;

the four blows are respectively: blowing argon in a trial mode before a furnace front seat tank, and checking the air permeability of the air brick; during tapping, argon is blown in the whole process, so that the crack of the air brick is prevented from being infiltrated with metal and nonmetal substances; soft blowing is carried out after refining is in place, the steel coagulation phenomenon caused by temperature drop on the surface of the air brick is prevented, and the smoothness of argon blowing is ensured; and after the steel ladle is unloaded from the casting machine, carrying out back flushing immediately to ensure that foreign matters are not condensed on the surface of the air brick after liquid slag is turned out.

Further, the specific operation steps are as follows:

s1: when the steel ladle enters a steel ladle preparation area for treatment, the head of the air brick is burnt and washed when the steel ladle is condensed and cooled, and test blowing is carried out simultaneously to determine the air permeability of the air brick, so that the next procedure can be carried out after the problem is found out to be solved;

s2: in the tapping process before the furnace, argon is blown in the whole process, so that metal and nonmetal liquid with low melting point and low surface tension are prevented from permeating into a gap of the air brick;

s3: after the ladle is in place for refining, argon is immediately communicated for soft blowing, the phenomenon of steel solidification at the head of the air brick caused by the reduction of the temperature of the ladle bottom in the period of waiting for refining is prevented, and the argon is ensured to be always smooth;

s4: immediately connecting high-pressure nitrogen after the ladle is discharged from the casting machine, carrying out back flushing, and blow-drying and pouring out residual substances before the residual substances are not solidified;

s5: when argon is closed, the negative pressure effect generated when the gas flows out is prevented by the airflow non-return device below the air brick.

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

the method for guaranteeing the refining effect of the argon blowing at the bottom of the steel ladle provided by the patent has the advantages that the operation method of blocking the negative pressure and washing four times is adopted, the metallurgical production process is run through, the phenomena of bleed-out, steel sticking and the like are effectively prevented by starting from details, the refining effect of the argon blowing at the bottom is guaranteed, and the method can adapt to various steel ladle bottom blowing equipment systems. Has great popularization significance.

Detailed Description

A method for guaranteeing the refining effect of ladle bottom blowing argon comprises the steps of blocking negative pressure and washing and blowing; wherein:

the negative pressure blocking is realized by utilizing an airflow non-return device below the air brick to prevent the negative pressure generated when the gas flows out when the argon is closed;

the first washing is to clean the surface steel of the air brick by oxygen;

the four blows are respectively: blowing argon in a trial mode before a furnace front seat tank, and checking the air permeability of the air brick; during tapping, argon is blown in the whole process, so that the crack of the air brick is prevented from being infiltrated with metal and nonmetal substances; soft blowing is carried out after refining is in place, the steel coagulation phenomenon caused by temperature drop on the surface of the air brick is prevented, and the smoothness of argon blowing is ensured; and after the steel ladle is unloaded from the casting machine, carrying out back flushing immediately to ensure that foreign matters are not condensed on the surface of the air brick after liquid slag is turned out.

The specific operation steps are as follows:

s1: when the steel ladle enters a steel ladle preparation area for treatment, the head of the air brick is burnt and washed when the steel ladle is condensed and cooled, and test blowing is carried out simultaneously to determine the air permeability of the air brick, so that the next procedure can be carried out after the problem is found out to be solved;

s2: in the tapping process before the furnace, argon is blown in the whole process, so that metal and nonmetal liquid with low melting point and low surface tension are prevented from permeating into a gap of the air brick;

s3: after the ladle is in place for refining, argon is immediately communicated for soft blowing, the phenomenon of steel solidification at the head of the air brick caused by the reduction of the temperature of the ladle bottom in the period of waiting for refining is prevented, and the argon is ensured to be always smooth;

s4: immediately connecting high-pressure nitrogen after the ladle is discharged from the casting machine, carrying out back flushing, and blow-drying and pouring out residual substances before the residual substances are not solidified;

s5: when argon is closed, the negative pressure effect generated when the gas flows out is prevented by the airflow non-return device below the air brick.

Examples 1

Before and after the method for guaranteeing the refining effect of the ladle bottom blowing argon is used, the refining effect of the ladle bottom blowing argon is obviously improved, the argon blowing blocking or argon blocking phenomenon caused by steel sticking and steel leakage of a bottom blowing argon element is obviously reduced, the subsequent related quality problems and production retardation conditions are obviously improved, and specific statistical data are shown in the following table 1.

Table influence of argon blowing on casting machine in the first half year of 107 and the first half year of 08

Time of influence item	Steel modified heavy rail (furnace)	Wadding flow closing accumulation (flow)	Return stove (furnace)	Casting machine stop pouring (furnace)
					1-6 months in 07 years	18	32	8	14
1-6 months in 08 years	6	11	1	3

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.