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Semisteel steelmaking method

A molten steel and converter technology, applied in the manufacture of converters, etc., can solve the problems of slow slag incoming, high iron content in final slag, and difficulty in slag melting, and achieve the effects of reducing costs and solving slow incoming slag

Active Publication Date: 2014-09-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, activated lime and high-magnesium lime are commonly used raw materials for slagging in semi-steelmaking. Since the dicalcium silicate and tricalcium silicate that appear during the dissolution of lime form a shell on the lime surface, it hinders the internal CaO from melting into the slag. Become the limiting link of slagging speed
Therefore, in the slagging process of semi-steel making, there are problems such as difficulty in slagging, slow speed of slag incoming, and high content of total iron in the final slag

Method used

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Examples

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Effect test

example 1

[0030] The steel for SS(R) rails is smelted on a 120t converter in a steel factory. The actual weight of half-steel molten iron in the furnace is 138.8t, and the weight of the steel is 140.17t. The actual oxygen blowing volume is 6210m 3 . Dolomite is added after steel is tapped from the converter and the furnace is protected by slag splashing. The composition and temperature of molten iron and steel entering the furnace are shown in Table 1.

[0031] Table 1 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0032]

[0033]Dolomite is added after the converter is tapped and slag splashed to protect the furnace. The amount of dolomite added is 32kg / t steel. After waiting for 10 minutes, the semi-steel molten iron is loaded to start oxygen blowing steelmaking. After the semi-steel converter oxygen blowing starts Add active lime and slagging agent to the converter within 2 minutes, wherein the amount of active lime (containing 85% ...

example 2

[0040] Steel for SS(R) rails is smelted on a 120t converter in a steel plant. The actual weight of molten iron and steel entering the furnace is 135t, the weight of the steel is 136.54t, and the actual oxygen blowing volume is 6400m 3 . Dolomite is added after steel is tapped from the converter and the furnace is protected by slag splashing. The composition and temperature of molten iron and steel entering the furnace are shown in Table 3.

[0041] Table 3 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0042]

[0043] Dolomite is added after the converter is tapped and slag splashed to protect the furnace. The amount of dolomite added is 31kg / t steel. After waiting for 10 minutes, the semi-steel molten iron is loaded to start oxygen blowing steelmaking, and the oxygen blowing in the semi-steel converter starts. Add active lime and slagging agent to the converter within the last 2 minutes, wherein the adding amount of active li...

example 3

[0049] 45 types of steel are smelted on a 120t converter in a steel factory. The actual weight of molten iron and steel entering the furnace is 134t, the weight of the steel is 134.42t, and the actual oxygen blowing volume is 6600m 3 . Dolomite is added after steel is tapped from the converter and the furnace is protected by slag splashing. The composition and temperature of molten steel in the furnace are shown in Table 5.

[0050] Table 5 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0051]

[0052]

[0053] Dolomite is added after the converter is tapped and slag splashed to protect the furnace. The amount of dolomite added is 30kg / t of steel. After waiting for 10 minutes, the semi-steel molten iron is loaded to start oxygen blowing steelmaking, and the oxygen blowing in the semi-steel converter starts. Add active lime and slagging agent to the converter within the last 2 minutes, wherein the adding amount of active lim...

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Abstract

The invention provides a semisteel steelmaking method which comprises the following steps: adding dolomite to a converter; after dolomite is decomposed to CaO, MgO and CO2 in the converter under the residual temperature of the converter, pouring molten semisteel to the converter for blowing oxygen and converting, wherein a slagging constituent is added into the converter after converting for 2 minutes, and meanwhile, active lime is added to adjust the weight ratio of CaO / MgO in the slag to 2:1-3:1; and after converting, adjusting slag and discharging steel. The semisteel steelmaking method provided by the invention has the advantages of low production cost, quick slugging, quick slag generation, active slag state and good dephosphorization capacity of slag, and recovery of iron in the slag is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically, relates to a method for making steel using semi-iron molten iron. Background technique [0002] Converter slagging is required to produce slag with strong refining ability as soon as possible, so it is required to melt slag early and well during blowing. At present, activated lime and high-magnesium lime are commonly used raw materials for slagging in semi-steelmaking. Since the dicalcium silicate and tricalcium silicate that appear during the dissolution of lime form a shell on the lime surface, it hinders the internal CaO from melting into the slag. Become the limiting link of slagging speed. Therefore, in the slagging process of semi-steelmaking, there are problems such as difficulty in slagging, slow slag incoming speed, and high total iron content in the final slag. [0003] In addition, the competition among iron and steel enterprises is becoming i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36
Inventor 陈路梁新腾陈永曾建华冯远超黄德胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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