Method for adjusting furnace burden of furnace protection by splashing high-oxidability furnace slag
阅读说明：本技术 一种高氧化性炉渣溅渣护炉炉料调整的方法 (Method for adjusting furnace burden of furnace protection by splashing high-oxidability furnace slag ) 是由 张胤 梁志刚 麻晓光 张怀军 刁望才 徐涛 韩春鹏 张晓龙 田野 云霞 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种高氧化性炉渣溅渣护炉炉料调整的方法,包括：(1)减少出钢后炉内留渣量：采用少渣溅渣操作,在溅渣护炉前,倒出多于炉渣,保证留渣量；(2)利用增碳剂对炉渣进行脱氧处理,降低炉渣FeO含量；(3)溅渣过程加入白灰,增加炉渣碱度,为留渣操作提供条件。本发明的目的是提供一种高氧化性炉渣溅渣护炉炉料调整的方法,解决高氧化性炉渣炉衬维护溅渣护炉效果差的问题,改善溅渣料消耗经济指标。(The invention discloses a method for adjusting furnace burden of slag splashing protection of high-oxidizing furnace slag, which comprises the following steps: (1) reducing the slag remaining in the furnace after tapping: adopting less slag and slag splashing operation, and pouring more slag before slag splashing and protecting the furnace so as to ensure the amount of remaining slag; (2) deoxidizing the furnace slag by using a carburant to reduce the FeO content of the furnace slag; (3) lime is added in the slag splashing process to increase the alkalinity of the slag and provide conditions for slag remaining operation. The invention aims to provide a method for adjusting furnace burden of slag splashing protection of high-oxidizing furnace slag, which solves the problem of poor furnace burden protection effect of furnace lining maintenance of the high-oxidizing furnace slag and improves economic index of consumption of slag splashing materials.)
1. A method for adjusting furnace burden of slag splashing furnace protection of high-oxidizing furnace slag is characterized by comprising the following steps: the method comprises the following steps:
(1) reduce the amount of slag left in the furnace after tapping
Adopting less slag and slag splashing operation, and pouring more slag before slag splashing and protecting the furnace so as to ensure the amount of remaining slag;
(2) deoxidizing the furnace slag by using a carburant to reduce the FeO content of the furnace slag;
(3) lime is added in the slag splashing process to increase the alkalinity of the slag and provide conditions for slag remaining operation.
2. The method for regulating the charge of the furnace protection for slag splashing of the blast furnace slag according to claim 1, characterized in that: before slag splashing operation, 0.8kg/t of carburant is added into the furnace, the FeO content of the slag is effectively reduced, the viscosity of the slag is improved, the dynamic condition of the slag in the molten pool is increased by utilizing the generated CO gas, and the melting of splashing slag materials is accelerated, so that the modification effect of the slag is improved.
3. The method for regulating the charge of the furnace protection for slag splashing of the blast furnace slag according to claim 1, characterized in that: when the slag remaining operation process is adopted, 3kg/t-4kg/t lime is added to improve the alkalinity of the slag and improve the dephosphorization effect in the next smelting.
4. The method for regulating the charge of the furnace protection for slag splashing of the blast furnace slag according to claim 1, characterized in that: adding carburant and slag splashing material, and shaking the furnace for 30 seconds, then starting normal slag splashing operation, controlling the nitrogen flow of slag splashing, and ensuring that the maximum nitrogen flow does not exceed 4Nm3T.min; and in the slag splashing process, a small amount of slag splashing material is properly added according to the slag splashing condition to modify the slag again.
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for adjusting furnace burden of high-oxidability slag splashing furnace protection.
Background
The basic principle of slag splashing furnace protection is that after the steel is discharged from the converter, a slag regulating agent is added to make MgO in the steel react with the slag to generate a series of high-melting-point substances, and the high-pressure nitrogen sprayed out by an oxygen lance system splashes to most areas or designated areas of the furnace lining and adheres to the inner wall of the furnace lining to be gradually condensed into a solid firm protective slag layer which becomes a consumable material layer. When the converter is smelted, the protective layer can reduce the chemical erosion and mechanical scouring of high-temperature airflow and slag on the furnace lining so as to maintain the furnace lining, improve the furnace life and reduce the consumption of refractory materials including gunning materials and the like.
Mechanical erosion and chemical erosion of the furnace lining by the high-temperature and high-oxidizing slag are main causes of corrosion damage of the furnace lining. In order to improve the furnace life, steelmaking workers successively research and develop the material, the building method, the furnace repairing technology, the slag splashing technology and the like of the furnace lining bricks.
Through search query, the document and the invention patent which are the same as or similar to the patent do not exist.
Disclosure of Invention
The high FeO content in the slag is the most important reason for poor slag splashing furnace protection effect and serious lining erosion. High FeO greatly reduces the viscosity of the slag, thus requiring a large amount of slag-splashing charge to upgrade the slag. The slag splashing furnace protection can not achieve ideal effect while the production cost is deteriorated.
In order to solve the technical problems, the invention aims to provide a method for adjusting furnace burden of high-oxidability slag splashing protection, which solves the problem of poor furnace burden protection effect of maintaining high-oxidability slag furnace lining, and improves economic index of slag splashing material consumption.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for adjusting furnace burden of slag splashing furnace protection of high-oxidizing furnace slag, which comprises the following steps:
(1) reduce the amount of slag left in the furnace after tapping
Adopting less slag and slag splashing operation, and pouring more slag before slag splashing and protecting the furnace so as to ensure the amount of remaining slag;
(2) deoxidizing the furnace slag by using a carburant to reduce the FeO content of the furnace slag;
(3) lime is added in the slag splashing process to increase the alkalinity of the slag and provide conditions for slag remaining operation.
Furthermore, before slag splashing operation, 0.8kg/t of carburant is added into the furnace, the FeO content of the slag is effectively reduced, the viscosity of the slag is improved, and meanwhile, the dynamic condition of the slag in the molten pool is increased by utilizing the generated CO gas, so that the melting of splashed slag materials is accelerated, and the modification effect of the slag is improved.
Furthermore, when the slag retention operation process is adopted, 3kg/t-4kg/t lime is added to improve the alkalinity of the slag and improve the dephosphorization effect in the next smelting;
further, after adding the recarburizer and the slag splashing material and shaking the furnace for 30 seconds, starting normal slag splashing operation, and controlling the nitrogen flow of slag splashing to be not more than 4Nm at most3T.min; and in the slag splashing process, a small amount of slag splashing material is properly added according to the slag splashing condition to modify the slag again.
Compared with the prior art, the invention has the beneficial technical effects that:
after the method is adopted, as FeO in the slag is reduced, MgO in the slag splashing material can be fully separated out to ensure the MgO content of the slag, the slag splashing furnace protection effect is improved, the furnace lining protection is enhanced, and the slag splashing furnace protection material consumption is obviously reduced. Solves the problem of poor slag splashing effect of the high-oxidability furnace slag. Effectively reducing the production cost.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
A method for adjusting furnace burden of high-oxidizability slag splash furnace protection comprises the steps of pouring out a small part of slag before the slag splash furnace protection is started after tapping operation is finished, adding a carburant into the furnace after slag dumping, wherein the adding amount of the carburant is 0.8kg/t, and then sequentially adding dolomite accounting for 60% of the total amount of slag splash materials, light-burned dolomite and synthetic slag splash materials. And after the charging is finished, the furnace shaking operation is adopted, the carbon-oxygen reaction is fully utilized to fully remove oxygen in slag removal, the oxidizability of the slag is reduced, the dynamic condition in the furnace is increased, the melting of slag splashing materials is accelerated, and the modification treatment is carried out on the slag.
Adding carburant and slag splashing material, and shaking the furnace for 30 seconds, then starting normal slag splashing operation, controlling the nitrogen flow of slag splashing, and ensuring that the maximum nitrogen flow does not exceed 4Nm3T.min. And in the slag splashing process, a small amount of slag splashing material is properly added according to the slag splashing condition to modify the slag again.
When slag remaining operation is adopted, 3kg/t-4kg/t lime can be added to improve the alkalinity of the slag and improve the dephosphorization effect in the next smelting. If the slag remaining operation is not adopted, lime can not be added, and the slag is poured after the slag splashing operation is finished, and the next smelting is started.
The test was carried out in a 150t top-bottom combined blown converter. In the experimental process, 10 normal smelting heats are selected as experimental objects, partial slag is poured out after tapping is finished, 0.8kg/t of carburant and 60% of total amount of slag splashing materials are added for furnace shaking operation, and slag sample composition data are taken as comparison data.
Selecting a normal smelting end point of a 10-furnace converter as an experimental object. The final slag component is basic blank data, and the slag sample component after the operation of the method is adopted as comparison data. :
the experimental 20 slag sample data was summarized and analyzed as follows:
blank set of slag sample data
Experimental group slag sample data
Numbering
SiO2
CaO
TFe
MgO
Al2O3
MnO
P2O5
1
11.72
39.68
17.63
10.83
2.03
4.97
2.77
2
11.79
37.46
18.08
8.99
2.09
5.04
2.74
3
10.88
36.83
17.92
8.81
1.38
4.38
2.76
4
12.14
41.08
19.67
6.87
0.87
5.77
3.42
5
11.41
39.02
16.46
8.99
0.9
5.33
3.16
6
10.14
33.01
17.5
7.82
1.17
4.86
2.42
7
12.74
37.92
15.67
8.57
1.61
5.34
2.99
8
10.95
36.83
16.36
7.4
1.68
4.41
2.41
9
13.48
42.78
18.2
8.69
1.66
4.58
3.07
10
12.39
40.83
19.44
11.73
1.66
4.56
2.92
Mean value of
11.76
38.54
17.69
8.87
1.51
4.92
2.87
Compared with the components of the blank slag sample, the invention obviously improves the TFe content of the final slag. The TFe content of the blank group final slag is averagely 24.21 percent, the TFe content of the experimental group final slag is averagely 17.69 percent and is reduced by 6.52 percent; on the basis of adding 60 percent of the original slag splashing material, the MgO content of the experimental group final slag is 8.87 percent and is basically equal to 8.59 percent of the blank group final slag. The MgO content in the slag splashing furnace protection operation slag is ensured.
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.
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