Premelting molten iron pretreatment dephosphorization agent

A technology of hot metal pretreatment and dephosphorization agent, applied in the field of dephosphorization agent for molten iron pretreatment, can solve the problems of component segregation, increase pretreatment time, difficult storage and transportation, etc., achieve fast melting speed and reduce heat Effects of loss, ease of storage and transportation

Inactive Publication Date: 2008-11-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] (1) The solid synthetic dephosphorization agent has a high melting point and a low dephosphorization rate, increasing the pretreatment time will intensify the temperature drop of molten iron;
[0009] (2) The fluorite content in the solid synthetic dephosphorization agent is high, which seriously corrodes the lining and seriously pollutes the environment;
[0010] (3) The solid synthetic dephosphorization agent is easy to absorb water and difficult to store and transport;
[0011] (4) Due to the difference in component specific gravity, component segregation and unstable performance are easy to occur;
[0012] (5) The solid synthetic dephosphorization agent is generally a powder, which is easy to cause environmental pollution when used

Method used

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  • Premelting molten iron pretreatment dephosphorization agent

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Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the composition and weight percentage of the pre-melted hot metal pretreatment dephosphorization agent are: active lime: 40%, rolling steel oxide scale: 50%, fluorite: 10%.

[0035] The CaO content in the above-mentioned activated lime is ≥90%. CaF in fluorite 2 Content ≥ 88%.

[0036] For the pre-melted hot metal pretreatment dephosphorization agent in this embodiment, the raw materials of the formula are mixed according to the ratio before use, and then heated to 1250°C to 1400°C in the slag melting furnace to melt into liquid slag, and then it is taken out of the furnace and cooled rapidly , broken into granules. The dephosphorization effect of using this pre-melted molten iron pretreatment dephosphorization agent is as follows: the phosphorus content of the molten iron before treatment is 0.21%, and after 3 minutes of dephosphorization treatment, the phosphorus in the molten iron can be reduced to 0.0081%, and the dephosphorization rate is 96.1...

Embodiment 2

[0038] In this embodiment, the composition and weight percentage of the pre-melted hot metal pretreatment dephosphorization agent are: active lime: 49%, rolled steel oxide scale: 45%, fluorite: 6%. All the other are the same as in Example 1, the dephosphorization effect of using this premelting type molten iron pretreatment dephosphorization agent is: the phosphorus content of molten iron before treatment is 0.23%, and the phosphorus in molten iron can be reduced to 0.049% through 3min dephosphorization treatment, The dephosphorization rate was 78.7%. After 10 minutes of dephosphorization treatment, the phosphorus in the molten iron was reduced to 0.0077%, and the dephosphorization rate was 96.65%. After that, the phosphorus in the molten iron basically remained at a level of less than 0.01%.

Embodiment 3

[0040] In this embodiment, the composition and weight percentage of the pre-melted hot metal pretreatment dephosphorization agent are: active lime: 44%, rolled steel oxide scale: 50%, fluorite: 6%. All the other are the same as in Example 1, using this pre-melt type molten iron pretreatment dephosphorization agent, the phosphorus content of the molten iron before treatment is 0.19%, and the phosphorus in the molten iron can be reduced to 0.011% through 3min dephosphorization treatment, and the dephosphorization rate is 94.21%; after 10 minutes of dephosphorization treatment, the phosphorus in the molten iron was reduced to 0.0052%, and the dephosphorization rate was 97.26%. After that, the phosphorus in the molten iron basically remained at a level of less than 0.01%.

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Abstract

The invention discloses a pre-melted dephosphorizing agent that is used for preprocessing liquid iron in the field of metallurgy of iron and steel, and is particularly applicable to the smelting techniques that have bad raw material condition of the liquid iron and large fluctuation of initial phosphorus content or are used for producing low-phosphorus steel and ultra-low phosphorus steel. The pre-melted dephosphorizing agent that is used for preprocessing liquid iron is smashed into particles after a complete pre-melting processing at the temperature of 1250 to 1400 DEG C, and consists of following raw materials and weight percentages thereof: 35 to 50 percent of activated lime, 40 to 60 percent of iron oxide and 6 to 15 percent of fluorite. The pre-melted dephosphorizing agent that is used for preprocessing liquid iron has higher content of CaO and Fe2O3, meets the requirements of high basicity and high oxidizing slag of the dephosphorizing in the liquid iron preprocessing, can quickly reduce the phosphorus content in the liquid iron below 0.01 percent; consequently by adopting the pre-melted dephosphorizing agent that is used for preprocessing liquid iron of the invention, the phosphorus content in the liquid iron which has bad raw material condition of the liquid iron, high phosphorus content in the initial liquid iron and large fluctuation of initial phosphorus content can be reduced to a lower level, and the low-phosphorus liquid iron that is required for smelting the low-phosphorus steel and the ultra-low phosphorus steel can be provided.

Description

technical field [0001] The invention relates to a dephosphorization agent for molten iron pretreatment in the iron and steel metallurgy industry, especially a pre-melting agent for dephosphorization of molten iron used for poor raw material conditions and large fluctuations in initial phosphorus content, or for smelting low-phosphorus steel and ultra-low phosphorus steel Type hot metal pretreatment dephosphorization agent. Background technique [0002] With the development of society and science and technology, as well as the promotion and use of continuous casting technology and out-of-furnace treatment technology, the purity of steel has been significantly improved. Improving the purity of steel can improve the processing performance, mechanical properties and service performance of steel. And in today's increasingly fierce competition in the steel (especially high value-added products) market, many manufacturers strive to improve the cleanliness of steel and improve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 袁守谦张西锋魏颖娟王伟梁德安张启业
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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