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A method for high-efficiency dephosphorization of medium-high phosphorus molten iron in the process of mixing molten iron

A medium-high phosphorus and molten iron technology, applied in the field of high-efficiency dephosphorization, can solve problems such as poor kinetic conditions, slag consumption, prolonged smelting time, and low efficiency, and achieve long dephosphorization duration, low production and operation costs, and low temperature stable effect

Active Publication Date: 2015-11-04
天铁热轧板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the small and medium-sized iron and steel enterprises have problems such as irrational planning, mismatched process flow, unsound hot metal pretreatment equipment, or even none. However, excessive slag consumption and extension of smelting time are links that many iron and steel enterprises have to consider carefully, and this has also become the main factor restricting the wide application of low-priced high-phosphate rock
Mixed iron furnace / car is an important equipment for small and medium-sized steel enterprises to alleviate the mismatch between ironmaking and steelmaking capabilities, but its function positioning is single (storage of molten iron, insulation of molten iron, etc.), and at the same time there is more time to spare, and the potential for functional development is greater
[0005] At present, there are few researches on the function development of the mixing furnace / car process, and it is mainly used as a single molten iron container for molten iron pretreatment. Due to poor kinetic conditions, there is a dead zone and the efficiency is not high. However, the use of the mixing furnace / There is no relevant report on dephosphorization in the technological process of adding molten iron to ladle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The silicon content of the molten iron in the mixed iron furnace of enterprise A is 0.3%-0.4%, and the phosphorus content is 0.15%-0.16%. The mixing rate of molten iron in the molten iron mixing furnace is 300kg / s, and the molten iron ladle is planned to hold 150t of molten iron. The whole process of mixing molten iron is about 8.3 minutes.

[0029] In the process of mixing molten iron in the iron mixing furnace, prefabricated iron oxide balls of 1mm to 5mm are continuously added to the impact area of ​​molten iron in the ladle at a rate of 5.5kg / s, equivalent to a ton of iron consumption of 18kg / t 铁 , the addition rate of pre-melted dephosphorization agent is 7kg / s, equivalent to 23kg / t iron consumption per ton 铁 .

[0030] After the iron has been blended, the ladle is hoisted to the slag removal station with a crane, and 95% of the molten iron slag is quickly removed. The temperature measurement is 1290°C, the phosphorus content at the end is 0.020% to 0.0...

Embodiment 2

[0031] Example 2: The silicon content of the molten iron in the mixed iron furnace of enterprise B is 0.4%-0.5%, and the phosphorus content is 0.18%-0.21%. The mixing rate of molten iron in the molten iron mixing furnace is 260kg / s, and the molten iron ladle is planned to hold 80t of molten iron. The whole process of mixing molten iron takes about 5 minutes.

[0032] In the process of adding molten iron to the mixing furnace, 1mm to 4mm of sintered ore is continuously added to the impact area of ​​molten iron in the ladle at a rate of 7.0kg / s, equivalent to a ton of iron consumption of 27kg / t 铁 , the addition rate of self-prepared dephosphorization agent is 8.9kg / s (lime: light burnt dolomite: fluorite = 7:2:1), equivalent to 33kg / t iron consumption per ton 铁 .

[0033] After the iron has been blended, the molten iron ladle is hoisted to the slag removal station by a crane, and more than 90% of the molten iron slag is quickly removed. The temperature of the treated molten iro...

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Abstract

The invention discloses a high-efficiency high-phosphorus molten iron dephosphorizing method used in the molten iron mixing process, and belongs to the technical field of pretreatment of molten iron. In the method, the process of mixing molten iron into an iron ladle by an iron mixing furnace / vehicle is taken as the reaction time for dephosphorizing the molten iron in a melting pool; the potential energy of the molten iron is taken as melting pool stirring power; in a molten iron mixing impact area, a small granular solid oxidant and a small granular dephosphorizing agent with the same proportion as the iron output are continuously added; and in the whole molten iron mixing dynamic process, the silicon content of the molten iron, the slag basicity, the temperature and other dephosphorizing indexes are kept stable basically and the binary basicity CaO / SiO2 after slagging is controlled at 1.5-2.5. By the method, the molten iron dephosphorizing rate is higher than 75% and the rephosphorizing rate is lower than 3%; and the method has the characteristics of simpleness and convenience in operation, low process cost and the like.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment, and in particular relates to a high-efficiency dephosphorization method for medium-high phosphorus molten iron in the process of adding molten iron. Background technique [0002] As the steel market continues to slump, steel companies have reached a stage where they are competing for production costs. This has intensified the demands of steel enterprises for the normal application of a high proportion of low-priced high-phosphate rock in production. How to increase the application proportion of low-priced high-phosphate minerals, reasonably control the content of phosphorus in steel, and reduce the cost of raw materials and comprehensive production costs has become an important issue for metallurgists. [0003] The solution to the problem of high phosphorus content in molten iron is mainly divided into three aspects: first, control the phosphorus content of raw material ores fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 易操孟宪成李兴才俞飞王克玉侯娜娜
Owner 天铁热轧板有限公司
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