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Smelting method for producing manganese-rich slag by smelting and reduction of high-manganese liquid iron in electric furnace

A smelting method and manganese-rich slag technology, applied in the field of iron and steel metallurgy, can solve the problems of splashing and blowing damage, difficult temperature control, large amount of slag, etc., achieve stable chemical composition and temperature of semi-steel, reduce production cost, production process simple effect

Active Publication Date: 2013-03-13
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Manganese-rich slag is a raw material for the production of silicon-manganese alloys, ferromanganese, and manganese metal. Usually, manganese-rich slag is obtained by smelting molten iron in blast furnaces and electric furnaces with manganese-rich ore as raw material, and its production cost is relatively high.
At present, with the development of direct reduced iron technology, many electric furnaces also produce molten iron with high manganese content. This kind of reduced molten iron contains high silicon and manganese, which is usually blown by oxidation and enters the slag during the steelmaking process. and was abandoned, resulting in a waste of manganese resources
In addition, whether the reduced molten iron with high Si and Mn content is smelted by electric furnace or converter, there are many defects, such as long electric furnace smelting cycle, large amount of slag, difficult control of converter smelting temperature, large amount of slag, splashing and blowing damage more serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A. Melt and reduce high-manganese molten iron in an electric furnace with a temperature of 1450°C and a chemical composition of: C 2.70 wt%, Si 1.10 wt%, Mn 2.15 wt%, S 0.015 wt%, and P 0.095 wt%, and put it into a nominal capacity of 50 tons The oxygen top-bottom double-blown converter is used for blowing, and the smelting process does not add conventional slagging materials such as lime and dolomite;

[0014] B. During blowing, first lower the oxygen lance for blowing at a low lance position for 2.0 minutes, the position of the oxygen lance is controlled at a distance of 600 mm from the muzzle to the bottom of the furnace, and then lift the lance for blowing at the middle lance position for 1.0 minutes, and the position of the oxygen lance is controlled At the point where the muzzle is 700mm from the bottom of the furnace, the gun is raised again for 3.0 minutes of blowing at a high gun position, and the position of the oxygen lance is controlled at a distance of 850mm...

Embodiment 2

[0017] A. Melt and reduce high-manganese molten iron in an electric furnace with a temperature of 1489°C and a chemical composition of: C 3.30wt%, Si 1.36 wt%, Mn 2.85 wt%, S 0.023 wt%, P 0.116 wt%, and put it into a nominal capacity of 50 tons The oxygen top-bottom double-blown converter is used for blowing, and the smelting process does not add conventional slagging materials such as lime and dolomite;

[0018] B. When blowing, first lower the oxygen lance for blowing at a low lance position for 2.5 minutes. The position of the oxygen lance is controlled at a distance of 700mm from the muzzle to the bottom of the furnace. At the point where the muzzle is 750mm from the bottom of the furnace, the gun is lifted for 3.5 minutes of blowing at a high gun position. The position of the oxygen lance is controlled at a distance of 950mm from the muzzle to the bottom of the furnace; The strength is 2.5m3 / min.t, and the oxygen blowing time is 7.5 minutes;

[0019] C. After the blowing...

Embodiment 3

[0021] A. Melt and reduce high-manganese molten iron in an electric furnace with a temperature of 1530°C and a chemical composition of: C 3.80 wt%, Si 1.50 wt%, Mn 3.20 wt%, S 0.032wt%, P 0.130 wt%, and put it into a nominal capacity of 50 tons The oxygen top-bottom double-blown converter is used for blowing, and the smelting process does not add conventional slagging materials such as lime and dolomite;

[0022] B. When blowing, first lower the oxygen lance for blowing at a low lance position for 3.0 minutes, the position of the oxygen lance is controlled at a distance of 750 mm from the muzzle to the bottom of the furnace, and then lift the lance and carry out blowing at the middle lance position for 2.0 minutes, and the position of the oxygen lance is controlled At the point where the muzzle is 800mm from the bottom of the furnace, the gun is raised again for 4.0 minutes of blowing at a high gun position. The position of the oxygen lance is controlled at a distance of 1000mm...

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Abstract

The invention provides a smelting method for producing manganese-rich slag by smelting and reduction of high-manganese liquid iron in an electric furnace. According to the smelting method, the high-manganese liquid iron smelted and reduced by the electric furnace is placed in a converter and subjected to converting through constant pressure gun changing operation, without adding any slagging materials in the converting process; and oxygen supply converting is carried out for 6-9 minutes at the conditions of oxygen purity more than or equal to 99.5%, pressure of 0.65-0.65 MPa, oxygen supply intensity of 1.7-2.5 m<3> / min. t, so that Mn and Si in the liquid iron are oxidized quickly, the content of manganese in the slag is further increased and then the high-grade manganese-rich slag is formed. The efficient utilization of the manganese resource in the high-manganese liquid iron smelted and reduced by the electric furnace is realized and the manganese-rich slag can be used for producing silicon-manganese alloy, ferromanganese and manganese metal; the production technology is simple, the production cost is lowered greatly and the economic benefit is increased; and the semi-steel chemical components and the temperature after the production of the manganese-rich slag with the method are stable, thus the normal operation requirements of follow-up steel-making work procedures are completely met.

Description

[0001] technical field [0002] The invention relates to a smelting method, in particular to a smelting method for producing manganese-rich slag by smelting and reducing high-manganese molten iron in an electric furnace, and belongs to the technical field of iron and steel metallurgy. Background technique [0003] Manganese-rich slag is a raw material for the production of silicon-manganese alloys, ferromanganese, and manganese metal. Usually, manganese-rich slag is obtained by smelting molten iron in a blast furnace or an electric furnace using manganese-rich ore as a raw material, and its production cost is relatively high. At present, with the development of direct reduction iron technology, many electric furnaces also produce molten iron with high manganese content. This kind of reduced molten iron contains high silicon and manganese, which is usually blown by oxidation and enters the slag in the steelmaking process. And be abandoned, caused the waste of manganese resou...

Claims

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Application Information

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IPC IPC(8): C21C5/32
Inventor 张卫强陈伟李金柱赵卫东刘明生杨春雷章祝雄
Owner WUKUN STEEL
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