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Method for controlling temperature of steelmaking melting pool of converter by blowing CO2 gas

A converter steelmaking, CO2-O2 technology, applied in the manufacture of converters and other directions, can solve the problems of difficult control, decreased dephosphorization rate, unstable dephosphorization, etc., to achieve diversification, improve dephosphorization efficiency, and flexibly control smelting Effect of Steel Cost

Inactive Publication Date: 2009-12-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for stable temperature control of the converter steelmaking molten pool, to realize the diversification of raw materials for converter steelmaking, and to flexibly control the cost of steelmaking; meanwhile, it also provides a converter dephosphorization COMI (CO 2 and O 2 mixed injection) steelmaking process (such as figure 1 ), to solve technical problems such as a sharp drop in dephosphorization rate in the early and mid-term of converter blowing, unstable dephosphorization, and difficulty in control

Method used

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  • Method for controlling temperature of steelmaking melting pool of converter by blowing CO2 gas
  • Method for controlling temperature of steelmaking melting pool of converter by blowing CO2 gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Pour 28 tons of molten iron and 5 tons of steel scrap into the converter, the temperature of the molten iron is 1300°C, adjust V in the spray gun according to the composition of the molten pool (C, Si, Mn, P) CO2 / (V O2 +V CO2 ) ratio, the ratio range is 20% to 50%, and the gas flow rate is 6000 to 9000Nm 3 / h. After about 5 minutes of spraying, the desiliconization and dephosphorization are completed, and the decarburization period is entered;

[0018] (2) After entering the decarburization period, adjust V CO2 / (V O2 +V CO2 ) ratio, the gas flow rate is 7500~10000Nm 3 / h. Then take samples and measure temperature to prepare for tapping.

[0019] Table 133 ton converter smelting parameter comparison table

[0020] process

Embodiment 2

[0022] (1) Pour 135 tons of molten iron and 25 tons of steel scrap into the converter, the temperature of the molten iron is 1320°C, adjust V in the spray gun according to the composition of the molten pool (C, Si, Mn, P) CO2 / (V O2 +V CO2 ) ratio, the ratio range is 10% to 50%, and the gas flow rate is 24000 to 36000Nm 3 / h. After about 5 minutes of spraying, the slag is dumped, new slag is made, and the decarburization period is entered;

[0023] (2) After entering the decarburization period, adjust V CO2 / (V O2 +V CO2 ) ratio, the gas flow rate is 26000~36000Nm 3 / h, then sampling and temperature measurement, ready to tap.

[0024] Table 2160 ton converter smelting parameter comparison table

[0025] process

Embodiment 3

[0027] (1) Pour 110 tons of molten iron into the converter for full iron smelting. The temperature of the molten iron is 1290°C. Adjust the V in the spray gun according to the composition of the molten pool (C, Si, Mn, P). CO2 / (V O2 +V CO2 ) ratio, the ratio range is 15% to 60%, and the gas flow rate is 18000 to 28000Nm 3 / h. After about 5 minutes of spraying, the slag is dumped, new slag is made, and the decarburization period is entered;

[0028] (2) After entering the decarburization period, adjust V CO2 / (V O2 +V CO2 ) ratio, the gas flow rate is 21000~28000Nm 3 / h, then sampling and temperature measurement, ready to tap.

[0029] Table 3 Comparison table of smelting parameters of full molten iron converter

[0030] process

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Abstract

The invention discloses a method for controlling temperature of a steelmaking melting pool of a converter by blowing CO2 gas, which belongs to the filed of convertor steel making and relates to a converter dephosphorization technology. The invention sprays CO2 gas (or mixed gas of CO2-O2) into the melting pool of the converter and realizes the smooth temperature increase of the melting pool by regulating the proportion of V[CO2] / (V[O2]+V[CO2]). The proportion of V[CO2] / (V[O2]+V[CO2]) is controlled at 10%-100% at the early and middle stages of melting (3-5min), the total flow rate of the blowing gas is 100-80000Nm / h, bottom blowing and strong stirring are adopted at this time, and the temperature is controlled between 1300 DEG C and 1400 DEG C. The proportion of V[CO2] / (V[O2]+V[CO2]) is adjusted and controlled at 10%-50% at the middle stage of melting according to desilication and dephosphorization situation and the temperature of the melting pool, and the flow rate of the blowing gas is 100-80000Nm / h. The method is applicable to the converter steel making of 30-300 tons, the dephosphorization rate can achieve 85%-95% by adopting the method, and the rephosphorization rate after slag dumping is lower than 3%.

Description

technical field [0001] The invention belongs to the field of steelmaking, in particular to a method for controlling the temperature of a molten pool of a converter. Background technique [0002] Cooling materials in the converter steelmaking process are indispensable. At present, the converter cooling materials mainly include scrap steel, pig iron, ore, etc. Because the market price of steel cold material fluctuates greatly, steel enterprises must not only produce high-quality products, but also have the ability to flexibly control their own costs if they want to occupy a favorable position in the market competition. Therefore, it is very necessary for steel mills to realize the diversified addition of raw materials to reduce production costs. Exploring a cheap and high-efficiency coolant to adjust the energy balance in the furnace is the primary issue considered by steelworks after changing the feed mode of raw materials. At present, the industrial recovery technology of ...

Claims

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Application Information

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IPC IPC(8): C21C5/34
Inventor 朱荣陈伯瑜汪灿荣易操柯建祥王慧霞吕明
Owner UNIV OF SCI & TECH BEIJING
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