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Iron adding process-based medium-high silicon molten iron desilication method

A medium-high silicon and molten iron technology, applied in the direction of process efficiency improvement, etc., can solve the problems of difficult slag cleaning, unfavorable maintenance of mixed iron cars, and influence on continuous production, so as to achieve sufficient desiliconization reaction time, low production and operation costs, Efficient desiliconization effect

Inactive Publication Date: 2014-03-26
德龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document does not involve in the desiliconization process, parameter setting and process effect of using the stirring potential energy of the molten iron in the process of pouring the molten iron.
At the same time, the desiliconization agent proposed by the author requires very fine particle size, and must be added by gas transportation. If it is added in the molten iron pool, a special spray gun is bound to be required; if it is added on the surface of the molten iron, the dust removal load will be large.
Comprehensive analysis shows that the device is more complex and requires a larger investment
[0006] Xia Xingming, Production practice of desiliconization, dephosphorization and desulfurization of molten iron in mixed iron car [J], Iron and Steel, 1999, (34): 547-549. This document mainly introduces the use of injection treatment device in mixed iron car to complete the The desiliconization, dephosphorization, and desulfurization production, the disadvantage is that it is difficult to clean the slag in the mixed iron car, which is not good for the maintenance of the mixed iron car and affects the continuous production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] The silicon content of molten iron in a mixing furnace of an enterprise is 0.8%. It is planned to remove the silicon content of the molten iron to 0.2% after mixing the molten iron in the mixing furnace. The mixing rate of the molten iron mixing furnace is 210kg / s. The process is about 6.3 minutes.

[0029] In the process of adding molten iron to the iron mixing furnace, 2-8mm sintered ore is continuously added to the molten iron ladle at a rate of 8kg / s, equivalent to a ton of iron consumption of 38kg / t 铁 , the lime addition rate is 3kg / s, equivalent to a ton of iron consumption is 14kg / t 铁 .

[0030] After the iron has been blended, the ladle is hoisted to the slag removal station with a crane. The slag on the surface of the ladle is dry and easy to remove slag. Tilt the bag seat to quickly remove 80% of the molten iron slag, measure the temperature at 1310°C, and take a sample of the molten iron to detect that the silicon content is 0.15%. After the slag is remove...

Embodiment example 2

[0032] The silicon content of molten iron in a mixing furnace of an enterprise is 1.1%. It is planned to remove the silicon content of the molten iron to 0.3% after mixing the molten iron in the mixing furnace. The mixing rate of the molten iron mixing furnace is 300kg / s. The process is about 6.6 minutes.

[0033] In the process of adding molten iron to the iron mixing furnace, 1-8mm sintered ore is continuously added to the molten iron ladle at a rate of 12kg / s, equivalent to a ton of iron consumption of 40kg / t 铁 , the lime addition rate is 4kg / s, equivalent to a ton of iron consumption is 13kg / t 铁 . During the feeding process, if the slag layer thickens and becomes dry, add 200kg of fluorite.

[0034] After the iron has been blended, the ladle is hoisted to the slag removal station with a crane. The slag on the surface of the ladle is dry and easy to remove slag. Tilt the bag seat to quickly remove 90% of the molten iron slag, measure the temperature at 1350°C, and take a...

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PUM

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Abstract

The invention discloses an iron adding process-based medium-high silicon molten iron desilication method, and belongs to the technical field of molten iron pretreatment. The process of adding molten iron into a molten iron ladle by utilizing an iron mixing furnace / vehicle serves as molten iron desilication reaction time in a melting furnace; the potential energy of iron molten serves as stirring power of the melting furnace. A solid oxidizer and a slag-regulating agent in the same proportion as that of the iron flow of the iron mixing furnace / vehicle are added continuously to realize high-efficiency desilication. The method has the advantages that the burden of high-silicon molten iron in converter smelting is lightened; the cost of steel smelting is reduced; moreover, the process is simple; the operability is high; the equipment investment is low; the operating cost is low.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment, and in particular relates to a method for desiliconizing medium-high silicon molten iron based on the process of mixing iron in an iron mixing furnace. Background technique [0002] Under the sluggish steel market, iron and steel enterprises have reached the stage of competing for production costs, which has greatly increased the steel enterprises' low-priced ore (silicon, phosphorus, sulfur and one or several other elements with high content) demand capacity. Low-priced ore has brought a great burden to iron and steel production due to problems such as high silicon, high phosphorus, and high sulfur. How to alleviate the production pressure of each process through process optimization or technological innovation has become a new topic for metallurgists. For the vast majority of small and medium iron and steel enterprises, the hot metal pretreatment equipment is not perfect, or e...

Claims

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Application Information

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IPC IPC(8): C21C1/04
CPCY02P10/20
Inventor 易操孟宪成王克玉俞飞李兴才侯娜娜
Owner 德龙钢铁有限公司
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