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Converter steelmaking method for molten iron [Si] (0.50%)

A converter steelmaking and molten iron technology, applied in the manufacture of converters, lime production, etc., can solve the problems of slag splashing, difficult to grasp, and difficult to control, so as to improve the process slag melting ability, improve the end point hit rate, The smooth effect of the smelting process

Inactive Publication Date: 2018-11-27
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is difficult to realize automatic steelmaking because it is difficult to grasp the slagging time and angle of the shaking furnace when lifting the gun and shaking the furnace
[0003] Chinese Patent Application No. 201410410159.0 discloses an automatic control method for slag-less smelting of converters. According to the set target temperature, the method adopts an intermediate lifting gun to dump the furnace and dump the slag. Timing has an impact. This method does not consider the process of slagging and carries out slag dumping, but early slag melting will easily cause splashing; if slag melting is late, it will bring difficulties to slag dumping, which will bring difficulties to the blowing process again (Splash is difficult to control)
[0004] Chinese patent application number CN201310685766.3 discloses a slag operation method for automatic steelmaking in converters. Although this method improves the dephosphorization effect of the converter, the slag splashing time is longer than 5 minutes, and the amount of slag remaining is determined according to the composition of molten iron. , the amount of slag left is unstable and difficult to control

Method used

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  • Converter steelmaking method for molten iron [Si] (0.50%)
  • Converter steelmaking method for molten iron [Si] (0.50%)
  • Converter steelmaking method for molten iron [Si] (0.50%)

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The converter is a 120t top-bottom combined blowing converter.

[0031] (1) Leave 23kg / t steel in the furnace to protect the furnace by pouring out the slag from the previous furnace, and the slag splashing time is 3.5 minutes;

[0032] (2) After the slag splashing is completed, shake the furnace down to 135 degrees, and then lift the furnace to add scrap steel and iron.

[0033] (3) According to molten iron composition (Si: 0.43%, P: 0.165%, etc.), temperature (1289°C) and weight, amount of scrap steel, target of smelted steel (target temperature 1640°C and target carbon: 0.010%) and slag Calculate the amount of bulk materials (lime, dolomite and sinter) that need to be added.

[0034] (4) According to the model control oxygen lance system and bulk material system for smelting.

[0035] (5) Oxygen lance control is executed according to the set lance position. That is, the initial stage is 1800mm, and the process becomes a gradient drop gun, blowing to 5222Nm 3 When...

Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is that 5 furnaces of steel are continuously smelted in a 120 t top-bottom combined blowing converter according to the converter steelmaking method described in the present invention. Continuous smelting is carried out according to the cycle process of leaving slag in the furnace-slag splashing to protect the furnace-adding scrap steel-adding iron-blowing-tapping-leaving slag in the furnace. The composition of molten iron and the ratio of scrap steel are shown in Table 1. The amount of slag remaining in the furnace is controlled at 23-25kg / t, and the top-bottom combined blowing smelting starts. The gun position adopts the set model gun position, and the feeding method adopts the model. During the process, the sub-lance is used to measure TSC, and at the end, the sub-lance is used to measure TSO. The composition and temperature at the end point of TSO are shown in Table 2, the amount of slag remaining and the amoun...

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Abstract

The invention discloses a converter steelmaking method for molten iron [Si] (0.50%). The converter steelmaking method comprises the following steps: confirming objective temperature, objective carbon,final phosphor, dephosphorizing rate and alkalinity of final residue according to different types of steel; calculating lime addition amount, dolomite addition amount, sinter addition amount and oxygen addition amount during a blowing process according to oxygen balance and heat balance; performing circular smelting in the smelting sequence of leaving residue in the converter, protecting the converter by splashing residue, adding waste steel and mixing with iron, blowing and then tapping. According to the invention, the slag amount and the process splashing phenomenon can be reduced and the consumption of lime and dolomite can be reduced without influence on the dephosphorizing rate.

Description

technical field [0001] The invention relates to a high-efficiency converter steelmaking method, which belongs to the technical field of converter steelmaking in the iron and steel metallurgy industry. Specifically, the invention relates to a converter steelmaking method for molten iron [Si]<0.50%. Background technique [0002] With the gradual reduction of resources such as limestone, dolomite and low phosphorus iron ore, the traditional smelting method with high alkalinity and large amount of slag (in order to improve the dephosphorization effect) consumes a lot of energy and the production cost is too high. This kind of smelting process can no longer keep up with the development of the times, and the smelting process of converter with high efficiency and low energy consumption is gradually put on the agenda. At present, the high-efficiency smelting process of the converter is mainly the slag-retaining process, but most steel mills adopt the slag-retaining and double-sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35
CPCC21C5/28C21C5/35Y02P40/40
Inventor 刘忠建高志滨
Owner SHANDONG IRON & STEEL CO LTD
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