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Dephosphorization method of semi-steel

A dephosphorization and slag-making technology, applied in the field of steelmaking, can solve the problems of insufficient heat source, low dephosphorization rate of converter, slow slag forming speed, etc., and achieves reduction of steelmaking production cost, high dephosphorization efficiency, and good dephosphorization effect. Effect

Inactive Publication Date: 2012-10-03
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to overcome the problem of insufficient heat source and slow slag forming rate during semi-steel smelting, resulting in low converter dephosphorization rate

Method used

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  • Dephosphorization method of semi-steel
  • Dephosphorization method of semi-steel
  • Dephosphorization method of semi-steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The parameters of the six-hole oxygen lance nozzle in a steel plant are shown in Table 1:

[0029] Table 1 Parameters of the six-hole oxygen lance nozzle

[0030] Nozzle type

Number of holes (pieces)

Throat diameter(mm)

Angle of spray hole (degrees)

Mach number

Modular

6 holes around

Φ33

16

2.05

[0031] A 120-ton converter in a steel plant is smelted with an oxygen lance whose parameters are listed in Table 1. The oxygen supply flow rate in the early stage of dephosphorization is 23000Nm 3 / h, the working pressure is 0.70MPa, the oxygen supply intensity is 2.84m 3 / (t steel min), the flow rate of nitrogen supply for bottom blowing is 100Nm when blowing is started 3 / h, the bottom blowing air supply intensity is 0.0592m 3 / (t steel min). At this time, the low gun position is mainly used to promote slag, and the gun position is 1.4m. The addition amount of the first batch of slagging material is: active lim...

Embodiment 2

[0036] The parameters of the six-hole oxygen lance nozzle in a steel plant are shown in Table 3:

[0037] Table 3 Parameters of the six-hole oxygen lance nozzle

[0038] Nozzle type

Number of holes (pieces)

Throat diameter(mm)

Angle of spray hole (degrees)

Mach number

Modular

6 holes around

Φ32

18

2.08

[0039] A 120-ton converter in a steel plant uses an oxygen lance whose parameters are shown in Table 3 for smelting. The oxygen supply flow rate is 25000Nm in the early stage of dephosphorization 3 / h, the working pressure is 0.75MPa, the oxygen supply intensity is 3.21m 3 / (t steel min), the flow rate of nitrogen supply for bottom blowing is 120Nm when blowing is started 3 / h, the gas supply intensity is 0.0889m 3 / (t steel min). The addition amount of the first batch of slagging material is: active lime 22kg / t semi-steel; slagging material high magnesium lime addition 20kg / t semi-steel; Add slagging agent at th...

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Abstract

The invention provides a dephosphorization method of semi-steel. The method comprises the following steps: adopting a six-hole oxygen gun to perform sectional smelting through a way of adjusting the oxygen supply strength of the oxygen gun, namely first dephosphorization smelting, adding a first batch of slag-making materials, controlling the oxygen supply strength of a top-blowing oxygen gun at 2.83-3.21Nm3 / (t steel. min), simultaneously bottom-blowing nitrogen, smelting and deslagging; performing second dephosphorization smelting, adding a second batch of the slag-making materials, controlling the oxygen supply strength of the top-blowing oxygen gun at 3.58-4.07Nm3 / (t steel. min), bottom-blowing the nitrogen during the time period from the beginning of the second dephosphorization smelting to carbon catching, bottom-blowing argon during the time period from the carbon catching to the terminal point of converting, smelting, stopping slag, tapping for getting molten steel with the content of a phosphorus element, which is not more than 0.008% by weight percentage, and performing the operation of remaining the slag after the tapping. By adopting the method, the dephosphorization effect is good, the dephosphorization efficiency is high, the smooth operation of the smelting process of a converter can be ensured, the steel-making production cost can be reduced and the semi-steel can be adopted for producing low-phosphorus steel with high grade and high added value.

Description

technical field [0001] The invention relates to the technical field of steelmaking, more specifically, to a method for dephosphorizing semi-steel. Background technique [0002] Since the mass percentage of carbon in semi-steel is 3.4% to 4.0%, and the contents of silicon and manganese exothermic slag-forming elements are traces, semi-steel smelting has the advantages of less acidic slag-forming substances in the blowing process, single slag system components, and low heat Insufficient and other characteristics, this makes semi-steel steelmaking more difficult than iron hydration slag, and the dephosphorization effect is not significant. After pretreatment of vanadium-containing molten iron, the mass percentage content of sulfur in semi-steel can be controlled within 0.015%, but the phosphorus content in vanadium-containing molten iron has no pretreatment measures; the mass percentage content of phosphorus in semi-steel is 0.055%~ 0.090%, and the fluctuation of phosphorus at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 陈均梁新腾杨森祥曾建华陈永刘荣蒂陈天明李清春李平凡曾耀先
Owner PANZHIHUA IRON AND STEEL
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