Treatment method of high-temperature high-silicon molten iron

A processing method and technology for molten iron, applied in the field of iron and steel metallurgy, can solve the problems of reducing the heat dissipation capacity of molten iron, reducing the temperature of molten iron, and high consumption of iron and steel materials, and achieving the effects of reducing heat dissipation capacity, increasing the amount of molten iron, and stable blowing

Pending Publication Date: 2021-08-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of high-temperature high-silicon molten iron in converter smelting in the prior art, such problems as high consumption of iron and steel materials and waste of heat, the present invention proposes a treatment method for high-temperature high-silicon molten iron, adding iron before ladle or torpedo tank receives high-temperature high-silicon molten iron oxides, the iron-containing oxides include sintered ore, pellets, iron oxide scale, in order to reduce the temperature of molten iron to reduce the heat dissipation capacity of molten iron itself during transportation

Method used

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  • Treatment method of high-temperature high-silicon molten iron

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Effect test

Embodiment 1

[0022] A treatment method for high-temperature high-silicon molten iron in this embodiment uses 300-ton torpedo tanks for the transportation of molten iron. Iron-containing oxides are added before molten iron. The high-temperature high-silicon molten iron is: molten iron temperature ≥ 1500 ° C, molten iron Si element mass fraction ≥ 0.6%; 100-500kg of lime, the lime particle size range is: 10-20cm, which is used to inhibit the reaction of C element and iron oxide in the molten iron to form foamy slag. The specific test conditions are shown in the table below.

[0023] Table 1 High-temperature high-silicon hot water treatment test table

[0024]

[0025] It can be seen from the experimental results that the high-temperature high-silicon molten iron treated by this technical scheme uses excess heat for heating and reducing iron-containing oxides when the torpedo tank receives the molten iron, increasing the amount of molten iron and keeping the temperature of the molten iron ...

Embodiment 2

[0027] A treatment method for high-temperature high-silicon molten iron in this embodiment has the same basic structure as in Embodiment 1. The difference and improvement are that the iron-containing oxides include sintered ore, pelletized ore, iron oxide scale, wherein sintered ore, pelletized ore The mass ratio of iron oxides in the pellets and iron oxides is ≥90%, and the added amount of the iron-containing oxides is:

[0028] M=1.43×10 -4 ×(T 1- a×△T-T 2 )×M 铁水 ;

[0029] Among them, M is the amount of iron oxide added / ton, M 铁水 is the mass of molten iron / ton, T 1 is the tapping temperature / °C, the value range of a is: 1.84~1.95, △T is the annual average temperature drop / °C during the process of transporting molten iron from the ironworks to the steelworks, where T 2 It is the target temperature / °C before entering the converter.

[0030] Wherein, the target temperature T before the converter 2 for:

[0031] T 2 =1280-((b×Si content of molten iron)-0.60%)×10 4 ×c...

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Abstract

The invention discloses a treatment method of high-temperature high-silicon molten iron, and relates to a ferrous metallurgy technology. The treatment method of the high-temperature high-silicon molten iron is characterized in that iron-containing oxide is added before a ladle or a torpedo ladle receives the high-temperature high-silicon molten iron, and the iron-containing oxide comprises sintered ore, pellet ore and oxide scale, so that the temperature of the molten iron is reduced, and the purpose of reducing the heat dissipation capacity of the molten iron in the conveying process is achieved; when the ladle or the torpedo ladle receives the molten iron, 100-500 kg of lime is added in order to restrain foam slag from overflowing, the particle size range of the lime is 10-20 cm, and therefore splashing caused by rapid rising of the temperature of a molten pool in the early stage of converter blowing is avoided. By reasonably reducing the temperature of the high-temperature high-silicon molten iron, blowing in the earlier stage of the converter blowing is stable, smooth operation of the converter working procedure is facilitated, and the problems that the high-temperature high-silicon molten iron is large in heat loss, and the converter blowing is difficult to stably carry out are solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a treatment method for high-temperature high-silicon molten iron. Background technique [0002] As an important intermediate product in the steel production process, molten iron has a great impact on the stability and cost of the entire steel manufacturing process by its temperature and composition, among which high-temperature high-silicon molten iron has a relatively adverse impact on the stability and cost of production. The main effects are: 1) According to the principle of heat transfer, when other heat transfer conditions remain unchanged, the higher the temperature of the object, the faster the heat dissipation. 2) When the high-temperature high-silicon molten iron enters the converter for blowing, due to the rapid oxidation of silicon in the molten iron and the release of a large amount of heat energy, coupled with the high temperature of the molten iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
CPCC21C7/00
Inventor 陆强沈昶郭俊波金友林周亚辉何云龙张诚袁月明
Owner MAANSHAN IRON & STEEL CO LTD
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