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A kind of method of semi-steel smelting low-sulfur steel

A low-sulfur steel, converter smelting technology, applied in the field of metallurgy, can solve problems such as difficult sulfur return control, and achieve the effect of reducing the amount of sulfur returned

Active Publication Date: 2016-03-16
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

[0004] The purpose of the present invention is to overcome the defect that it is difficult to control sulfur return in the existing semi-steel smelting low-sulfur steel method, and provide a method for semi-steel smelting low-sulfur steel that can realize effective sulfur return control

Method used

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  • A kind of method of semi-steel smelting low-sulfur steel
  • A kind of method of semi-steel smelting low-sulfur steel
  • A kind of method of semi-steel smelting low-sulfur steel

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Experimental program
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Effect test

Embodiment 1

[0022] In the present embodiment, the active lime is the active lime containing 90% by weight of CaO; the high magnesium lime is the high magnesium lime containing 30% by weight of MgO and 55% by weight of CaO; Ferrosilicon of Si and 25% by weight Fe.

[0023] The nominal capacity of the steelmaking converter is 200t. The composition and temperature of molten iron and steel entering the furnace are shown in Table 1.

[0024] Table 1

[0025]

[0026] After adding semi-steel into the converter, add 5kg / ton of ferrosilicon steel, then add active lime, high magnesium lime in turn, and top-blown oxygen for converter smelting. Among them, the amount of active lime added is 13kg / ton of steel, and the amount of high magnesium lime added 16kg / ton of steel, wherein, the oxygen lance position control of the top-blown oxygen includes: controlling the position of the blowing lance to 2m, the position of the blowing lance to 1.4m, the position of the carbon pulling lance to 1.4m, and ...

Embodiment 2

[0028] In the present embodiment, the active lime is the active lime containing 85% by weight of CaO; the high magnesium lime is the high magnesium lime containing 40% by weight of MgO and 48% by weight of CaO; Ferrosilicon of Si and 25% by weight Fe.

[0029] The nominal capacity of the steelmaking converter is 200t. The composition and temperature of molten steel in the furnace are shown in Table 2.

[0030] Table 2

[0031]

[0032] After adding semi-steel into the converter, add 3kg / ton of ferrosilicon steel, then add active lime, high magnesium lime in turn, and then blow oxygen with oxygen lance to carry out converter smelting. Among them, the amount of active lime added is 15kg / ton of steel, and high magnesium lime is added The quantity is 17kg / ton of steel. Among them, the oxygen lance position control of top blowing oxygen includes: controlling the blowing lance position to 2m, the blowing lance position to 1.8m, the carbon pulling lance position to 1.4m, and the...

Embodiment 3

[0034] In the present embodiment, the active lime is the active lime containing 87% by weight of CaO; the high magnesium lime is the high magnesium lime containing 35% by weight of MgO and 50% by weight of CaO; Ferrosilicon of Si and 25% by weight of Fe; the medium-carbon ferromanganese alloy is a medium-carbon ferromanganese alloy containing 80% by weight of Mn and 1.2% by weight of C.

[0035] The nominal capacity of the steelmaking converter is 200t. The composition and temperature of molten iron and steel entering the furnace are shown in Table 3.

[0036] table 3

[0037]

[0038] Add semi-steel into the converter, add 4.2kg / ton of steel ferrosilicon, then add active lime, high magnesium lime in turn, and then oxygen lance blowing oxygen to carry out converter smelting. Among them, the amount of active lime added is 14kg / ton of steel, high magnesium lime The addition amount is 16.5kg / ton of steel. Among them, the position control of the oxygen lance for top-blowing o...

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Abstract

The invention discloses a method for smelting low-sulfur steel with semisteel. The method comprises the steps of putting semisteel into a converter, then adding slag making materials, carrying out top blowing of oxygen for smelting in the converter, controlling the smelting terminal of the converter and tapping, wherein the slag making materials comprise silicon iron, active lime and high-magnesium lime; due to the addition amount of the slag making materials, the slag basicity can be regulated to be 3-4; the addition amount of the silicon iron is 3-5kg each ton of steel. According to the method disclosed by the invention, resulfurization amount can be greatly reduced so as to realize smelting of the low-sulfur steel with semisteel. Furthermore, the method is simple to operate and has good popularization and application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting low-sulfur steel from semi-steel. Background technique [0002] Due to the unique resources of vanadium-titanium magnetite in the Panxi area of ​​my country, vanadium-titanium magnetite is used in blast furnace smelting. Vanadium-titanium ore resources need to be extracted before steelmaking. However, the carbon quality of molten iron after vanadium extraction The percentage is lower than that of ordinary molten iron (3.0%-3.8%), and the content of silicon and manganese exothermic slag-forming elements is traces. Therefore, semi-steel smelting has the characteristics of less acidic slag-forming substances in the blowing process, a single slag system component, and a late initial slag formation time. , And insufficient heat and other characteristics, which makes semi-steel steelmaking more difficult than molten iron steelmaking. The common metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32
Inventor 陈路曾建华梁新腾杨森祥黄德胜杜丽华张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP