Semisteel steelmaking slagging process and method

A slag-making and process technology, which is applied in the semi-steel steel-making slag-making process and the semi-steel steel making field, can solve the problems of large amount of flue gas and dust, many batches of slag added, and difficult control, etc., so as to improve the utilization rate. rate, increase the speed of steelmaking and slag, and improve the effect of dephosphorization

Inactive Publication Date: 2015-02-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the difficulty of making slag in semi-steelmaking, many batches of slag are added during on-site smelting operations, resulting in a large amount of flue gas and dust, and it is very difficult to control the position of the oxygen lance and the speed of carbon reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Put the vanadium-extracted semi-steel (main element composition, C3.6%, P0.067%, S0.002%) into the steelmaking furnace, after the oxygen lance blows oxygen and strikes successfully, add slag steel 3.5kg / t steel and quartz sand 4.5kg / t steel, 3 minutes after the start of blowing, add lime 9.0kg / t steel, high magnesium lime 8.5kg / t steel, composite slagging agent 6.0kg / t steel, after forming primary slag Within 7 minutes after blowing starts, add 9.0kg / t steel lime and 12.0kg / t steel high-magnesium lime into the steelmaking furnace, and continue blowing until the molten steel composition is qualified (C0.04%, Mn0 .03%, P0.005%, S0.0037%, to obtain molten steel and final slag. In this example, the composition of the composite slagging agent is mainly 23% CaO, 51% SiO 2 , 10% Al 2 o 3 , 9% MgO.

[0021] According to statistics, the slagging time in the steelmaking process of this example is 5 minutes, the dephosphorization rate is 92.53%, and the process sulfur return is...

example 2

[0023] Put the vanadium-extracted semi-steel (main element composition, C3.4%, P0.074%, S0.001%) into the steelmaking furnace, after the oxygen lance blows oxygen and strikes successfully, add slag steel 3.5kg / t steel and quartz sand 4.5kg / t steel, 3 minutes after the start of blowing, add lime 9.0kg / t steel, high magnesium lime 8.5kg / t steel, composite slagging agent 6.0kg / t steel, after forming primary slag Within 7 minutes after blowing starts, add 9.0kg / t steel lime and 12.0kg / t steel high-magnesium lime into the steelmaking furnace, and continue blowing until the molten steel composition is qualified (C0.03%, Mn0 .02%, P0.005%, S0.0029%, to obtain molten steel and final slag. In this example, the composition of the composite slagging agent is mainly 21% CaO, 54% SiO 2 , 9% Al 2 o 3 , 9% MgO.

[0024] According to statistics, the slagging time in the steelmaking process of this example is 6 minutes, the dephosphorization rate is 93.24%, and the process sulfur return is ...

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Abstract

The invention provides a semisteel steelmaking slagging process and method. The slagging process comprises the steps of: adding semisteel treated by a vanadium extraction procedure into a steelmaking furnace; blowing oxygen through an oxygen gun to ignite, and adding 1.0-5.0kg / t steel of steel slag and 4.5-7.0kg / t steel of quartz sand; adding 8.0-10.0 kg / t steel of lime, 7.0-9.0 kg / t steel of high-magnesium lime and 5.0-11.0kg / t steel of composite slagging constituent after starting the blowing procedure for 2.8-3.2 minutes; adding 7.0-9.0 kg / t steel of lime and 7.0-12.0 kg / t steel of high-magnesium lime into the steelmaking furnace within 7-8 minutes in the duration of forming early slag and starting the blowing procedure, and continuing the blowing procedure until the molten steel ingredients are qualified to obtain target molten steel and final slag. The semisteel steelmaking slagging process provided by the invention has the advantages of capable of shortening the early slag forming time, improving the steelmaking slagging speed, simultaneously improving the slag dephosphorization effect, effectively controlling molten steel resulfurization in the steelmaking process, improving the utilization rate of CaO, accelerating the semisteel steelmaking lime fusion and reducing the lime consumption.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and specifically relates to a semi-steel making slagging process and a semi-steel making method using the semi-steel making slag process for slagging. Background technique [0002] Usually, vanadium-containing iron ore (for example, vanadium-titanium magnetite concentrate) is smelted in a blast furnace, and the molten iron obtained after vanadium extraction in a converter is called vanadium-extracted semi-steel (abbreviated as vanadium-extracted semi-steel) . Generally speaking, vanadium-extracted semi-steel is characterized by low carbon (about 3.6% on average), low silicon (less than 0.01%), low manganese (less than 0.05%), insufficient heat source, low content of slagging elements, and higher temperature than molten iron , the early oxidization of slag is low and the initial slagging is more difficult. In addition, due to the difficulty of slag production in semi-steelmaking, many batc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20Y02P40/40
Inventor陈炼喻林陈永戈文荪曾建华王建蒋龙奎黄德胜张强彭友全
OwnerPANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP