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A process for smelting stainless steel in a dephosphorization converter using limestone

A dephosphorization converter and limestone technology, applied in the manufacture of converters, etc., can solve the problems of increased environmental pollution, temperature surplus, and increased consumption of auxiliary materials, and achieve the effects of expanding the application range, prolonging the service life, and improving the dephosphorization efficiency

Active Publication Date: 2017-11-03
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the high content of silicon and manganese in molten iron, heat is released during the oxygen blowing process, resulting in excess temperature in the entire treatment process, which is not conducive to the removal of phosphorus, manganese and other elements, so the temperature control of the entire molten iron pretreatment process is particularly important.
In the prior art, due to the massive oxidation of silicon in the molten iron in the early stage of smelting, the temperature rises sharply. In order to control the process temperature well, a large amount of cold material has to be added to cool down, resulting in increased consumption of auxiliary materials and increased smelting costs; and the severe stainless steel market makes the reduction The cost of smelting has become the development trend of the iron and steel industry. In addition, in the industrial chain of calcination of slagging raw material lime to converter steelmaking, there is a waste of physical heat and CO carried by calcined lime. 2 Excessive discharge leads to the problem of increasing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of technology that utilizes limestone to smelt stainless steel 410S in dephosphorization converter, its specific steps are as follows:

[0022] (1) Add limestone to the dephosphorization converter: Add 5.0kg / t of molten iron limestone to the dephosphorization converter, shake the furnace back and forth to spread it evenly on the bottom of the furnace; the limestone particle size is 10mm, and the limestone content is calculated by mass percentage CaO: 50.0%, SiO 2 : 4.0%, MgO: 1.2%;

[0023] (2) Adding iron: inject 87 tons of molten iron at a temperature of 1200°C into the dephosphorization converter, and calcinate the limestone according to the temperature of the molten iron; the composition of the molten iron contains C: 3.5%, Si: 0.40%, Mn: 0.60 in mass percentage %, P: 0.05%, others are Fe and unavoidable impurities;

[0024] (3) Desiliconization treatment: top blowing oxygen flow rate 90Nm 3 / min, oxygen lance position 1700mm, bottom nitrogen flow 6Nm 3 / ...

Embodiment 2

[0029] A kind of technology that utilizes limestone to smelt stainless steel 430 in dephosphorization converter, its specific steps are as follows:

[0030] (1) Add limestone to the dephosphorization converter: add 5.5kg / t of molten iron limestone to the dephosphorization converter, shake the furnace back and forth to make it evenly spread on the bottom of the furnace; among them, the particle size of the limestone is 65mm; CaO: 55.0%, SiO2: 5.0%, MgO: 1.5%;

[0031] (2) Adding iron: inject 97 tons of molten iron with a temperature of 1320°C into the dephosphorization converter, and calcinate the limestone according to the temperature of the molten iron; the composition of the molten iron contains C: 4.6%, Si: 0.9%, and Mn: 0.9 in mass percentage %, P: 0.12%, others are Fe and unavoidable impurities;

[0032] (3) Desiliconization treatment: top blowing oxygen flow rate 150Nm 3 / min, the position of the oxygen lance is 1500mm, and the flow rate of nitrogen blowing at the bott...

Embodiment 3

[0037] A kind of technology that utilizes limestone to smelt stainless steel 409L in dephosphorization converter, its specific steps are as follows:

[0038] (1) Add limestone to the dephosphorization converter: add 5.2kg / t of molten iron limestone to the dephosphorization converter, shake the furnace back and forth to make it evenly spread on the bottom of the furnace; the limestone particle size is 40mm, and the limestone content is calculated by mass percentage CaO: 54.0%, SiO 2 : 4.5%, MgO: 1.3%;

[0039] (2) Adding iron: inject 92 tons of molten iron at a temperature of 1265°C into the dephosphorization converter, and calcinate the limestone according to the temperature of the molten iron; the composition of the molten iron contains C: 4.5%, Si: 0.56%, and Mn: 0.82 in mass percentage %, P: 0.07%, others are Fe and unavoidable impurities;

[0040] (3) Desiliconization treatment: top blowing oxygen flow rate 100Nm 3 / min, oxygen lance position 1600mm, bottom nitrogen flo...

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Abstract

The invention discloses a process for smelting stainless steel in a dephosphorization converter by using limestone and belongs to the technical field of stainless steel converter smelting. Limestone is mainly used to partially replace lime to smelt stainless steel in the dephosphorization converter, so that the application range of limestone which replaces lime in the technical field of iron and steel smelting in the prior art is expanded, and smelting of high-quality stainless steel types by using low-cost auxiliary materials is realized; by fully utilizing a good bottom-blowing stirring condition of the dephosphorization converter, limestone, lime and iron oxide scale balls are quickly melted, so that a purpose of quick dephosphorization is achieved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel converter smelting, and in particular relates to a technique for smelting stainless steel in a dephosphorization converter by utilizing limestone. Background technique [0002] In the smelting process of stainless steel 400 series steel grades, the main purpose of the dephosphorization converter is to dephosphorize and demanganize, and to provide high-quality low-phosphorus molten iron with suitable composition and temperature for the argon-oxygen reblowing furnace. At present, due to the high content of silicon and manganese in molten iron, heat is released during the oxygen blowing process, resulting in excess temperature in the entire treatment process, which is not conducive to the removal of phosphorus, manganese and other elements, so the temperature control of the entire molten iron pretreatment process is particularly important. In the prior art, due to the massive oxidation of sil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30
CPCC21C5/30
Inventor 陈兴润脱宏伟刘文生黄培军
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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