CN112662835A - Converter semi-steel smelting furnace protection method - Google Patents
Converter semi-steel smelting furnace protection method Download PDFInfo
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- CN112662835A CN112662835A CN202011438178.6A CN202011438178A CN112662835A CN 112662835 A CN112662835 A CN 112662835A CN 202011438178 A CN202011438178 A CN 202011438178A CN 112662835 A CN112662835 A CN 112662835A
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Abstract
The invention discloses a converter semi-steel smelting furnace protection method, which adopts the following measures aiming at the condition of insufficient heat quantity, S1: adding 30C-Si into the vanadium extraction furnace to supplement heat; s2: adding a graphite-like temperature raising agent into the semisteel furnace to supplement heat; s3, adopting a full slag remaining operation method for the semisteel furnace; s4: the steel ladle is covered in the whole process and the inner diameter of a steel tapping hole is increased; the following measures are taken for the condition that the melting point of the slag is low and the acid substances are more, S5: adding lime and light-burned dolomite; s6: the slag modifying agent with high carbon content is selected, and graphite-like is added during slag splashing. The converter semi-steel smelting furnace protecting method with the steps effectively solves the problems that the semi-steel is insufficient in heat, a slag splashing layer formed by a slag system is low in melting point, and slag is not easy to melt during blowing, so that the furnace life of the semi-steel furnace reaches 15000 times, the economic furnace life is basically realized, the cost is greatly saved, and the economic benefit is improved.
Description
Technical Field
The invention relates to a furnace protection method for converter semi-steel smelting.
Background
At present, most steel mills adopt common ore smelting, the melting point of slag generated by smelting molten iron to a converter is higher than that of slag generated by smelting vanadium-titanium molten iron, and in addition, the converter adopts a proper furnace protection technology (slag is provided with proper alkalinity and magnesium oxide) to basically realize that lining bricks in a furnace service period are not corroded or the corrosion degree is low through a slag splashing furnace protection technology, so that the service life of a blast furnace is realized.
However, vanadium-titanium magnetite in the southwest district of China is abundant in resources, and vanadium-containing molten iron can be smoothly produced by a blast furnace smelting technology for realizing comprehensive utilization efficiency, and the molten iron is mainly characterized by low melting point of furnace slag, more acidic substances and components: 3.8-4.2% of C, 0.220% of Si, 0.24% of Mn, 0.130% of P, 0.330% of V, 0.180% of Ti0.180%, and the components of the semisteel after vanadium extraction are approximately: 3.0 to 3.4 percent of C, 0.120 percent of P, 0.019 percent of Mn0.040 percent of V. Due to the characteristics of insufficient heat reduction of heating elements in the molten iron, low melting point of a slag system formed by the vanadium-containing molten iron and the like, the maintenance of the furnace condition is difficult, the average furnace life is about 10000, and the furnace life is low.
It is summarized that the common converter for smelting vanadium titano-magnetite has the following problems:
1. after vanadium extraction, low-temperature low-carbon and high-oxidizability are easily formed during blowing due to insufficient heat of semisteel.
2. Compared with the slag system smelted by common molten iron, the slag system smelted by vanadium-containing semisteel has lower melting temperature and quicker erosion of the slag splashing layer during blowing.
3. Because the acid substances in the semisteel are reduced, the semisteel is difficult to blow and melt slag, and the machine maintenance scouring is more serious than the ordinary molten iron smelting, the maintenance of the furnace condition of the semisteel furnace is more difficult, and the furnace life of the semisteel furnace is low.
Disclosure of Invention
In view of the above, the invention provides a converter semi-steel smelting protection method, which is used for prolonging the furnace life and prolonging the service life of a converter.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for protecting a converter during semi-steel smelting,
the following measures are taken in response to the insufficient heat,
s1: adding 30C-Si into the vanadium extraction furnace to supplement heat;
s2: adding a graphite-like temperature raising agent into the semisteel furnace to supplement heat;
s3, adopting a full slag remaining operation method for the semisteel furnace;
s4: the steel ladle is covered in the whole process and the inner diameter of a steel tapping hole is increased;
the following measures are taken for the condition that the melting point of the slag is low and the acid substances are more,
s5: adding lime and light-burned dolomite;
s6: the slag modifying agent with high carbon content is selected, and graphite-like is added during slag splashing.
As an improvement, 200-300Kg of 30C-Si is added into each furnace, so that the heat can be supplemented, and the temperature is increased by about 15 ℃.
As an improvement, 300-500Kg of similar graphite temperature raising agent is added into each furnace. The heat is supplemented, so that the temperature is increased by 15-25 ℃.
Preferably, after the last furnace finishes tapping and splashes slag, all the slag is used as initial slag of the next furnace. The reduction of the addition of the slag is used for reducing the heat loss, so that the temperature is increased by about 15 ℃.
As an improvement, the ratio of the lime to the light-burned dolomite is 1: 1. So as to improve the melting point of the slag and delay the oxidation speed of the slag during blowing.
Preferably, the carbon content of the slag modifier is more than 10%. Effectively increase the carbon content in the final slag.
The invention has the advantages that: the converter semi-steel smelting furnace protecting method with the steps effectively solves the problems that the semi-steel is insufficient in heat, a slag splashing layer formed by a slag system is low in melting point, and slag is not easy to melt during blowing, so that the furnace life of the semi-steel furnace reaches 15000 times, the economic furnace life is basically realized, the cost is greatly saved, and the economic benefit is improved.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The invention takes different measures for different situations.
The following measures are taken in response to the insufficient heat.
S1: adding 30C-Si into the vanadium extraction furnace to supplement heat; 300kg of 30C-Si 200-one with lower price is added into each vanadium extraction furnace to supplement heat and increase the temperature by about 15 ℃.
S2: adding a graphite-like temperature raising agent into the semisteel furnace to supplement heat; meanwhile, the temperature raising agent of 500kg of graphite is added according to the chemical calorific value of the semi-steel furnace, so that the heat raising temperature can be increased by 15-25 ℃, and the chemical heat loss in vanadium extraction is effectively balanced.
S3, adopting a full slag remaining operation method for the semisteel furnace; the semisteel furnace adopts a full slag remaining operation method, reduces the average slag consumption of the added slag, reduces 10 kg/ton steel, supplements heat, and raises the temperature by about 15 ℃.
S4: the steel ladle is covered in the whole process, the inner diameter of a steel tapping hole is increased, and the heat can be supplemented to raise the temperature by about 15 ℃. Meanwhile, the oxidability of the molten steel can be reduced, so that the FeO of the final slag is reduced to about 15 percent.
The following measures are taken against the condition that the melting point of the slag is low and the acid substances are more.
S5: adding lime and light-burned dolomite; lime and light-burned dolomite are added in a ratio of 1:1, so that the melting point of the slag is improved, and the oxidation speed of the slag in blowing is delayed.
S6: the slag modifying agent with high carbon content is selected, and graphite-like is added during slag splashing. The slag splashing furnace protection process is improved, a slag modifying agent with the carbon content of 10 percent is used in a matching manner, and graphite-like is added during slag splashing, so that the carbon content in the final slag is effectively increased; the above measures are technical measures for improving the viscosity of the slag to ensure slag splashing and furnace protection.
In addition, the optimization of the smelting technology adopts the steps of improving the oxygen supply intensity, shortening the smelting time, reducing the retention time of molten steel in the furnace, calculating the slag preparation process to obtain the lowest acid substance required by smelting, reducing the drying-back probability and reducing the jet flow scouring. And the auxiliary technical measures are matched to adopt iron supplement and slag supplement, and the measures of improving the first-pouring steel tapping rate and the like are adopted to maintain the front large face.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (6)
1. A converter semi-steel smelting furnace protection method is characterized by comprising the following steps:
the following measures are taken in response to the insufficient heat,
s1: adding 30C-Si into the vanadium extraction furnace to supplement heat;
s2: adding a graphite-like temperature raising agent into the semisteel furnace to supplement heat;
s3, adopting a full slag remaining operation method for the semisteel furnace;
s4: the steel ladle is covered in the whole process and the inner diameter of a steel tapping hole is increased;
the following measures are taken for the condition that the melting point of the slag is low and the acid substances are more,
s5: adding lime and light-burned dolomite;
s6: the slag modifying agent with high carbon content is selected, and graphite-like is added during slag splashing.
2. The converter protection method for smelting semi-steel by the converter according to claim 1, wherein 200-300Kg of 30C-Si is added to each furnace in the step S1.
3. The converter semi-steel smelting protection method of claim 1, characterized in that 300-500Kg of graphite-like temperature raising agent is added to each furnace in step S2.
4. The method for protecting a converter during smelting of semi-steel according to claim 1, wherein in step S3, after the last furnace has finished tapping and slag splashing, all the slag is used as the initial slag of the next furnace.
5. The converter semi-steel smelting furnace protecting method of the converter according to the claim 1, characterized in that the ratio of the lime to the light burned dolomite in the step S5 is 1: 1.
6. The converter protection method for converter semi-steel smelting according to claim 1, characterized in that the carbon content of the slag modifier in step S6 is more than 10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011438178.6A CN112662835A (en) | 2020-12-10 | 2020-12-10 | Converter semi-steel smelting furnace protection method |
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| CN202011438178.6A CN112662835A (en) | 2020-12-10 | 2020-12-10 | Converter semi-steel smelting furnace protection method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876834A (en) * | 2012-08-23 | 2013-01-16 | 攀钢集团研究院有限公司 | Method for modifying semisteel converter steelmaking final slag |
| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
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2020
- 2020-12-10 CN CN202011438178.6A patent/CN112662835A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876834A (en) * | 2012-08-23 | 2013-01-16 | 攀钢集团研究院有限公司 | Method for modifying semisteel converter steelmaking final slag |
| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
Non-Patent Citations (3)
| Title |
|---|
| 朱苗勇等: "《现代冶金工艺学-钢铁冶金卷（第2版）》", 30 June 2011, 冶金工业出版社 * |
| 王建等: "炼钢转炉使用类石墨提温剂试验研究", 《钢铁钒钛》 * |
| 陈建平: "低碳提钒半钢转炉炼钢工艺生产实践", 《四川冶金》 * |
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Application publication date: 20210416 |