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Smelting method for producing rich-manganous slags with blast furnace rich-manganous molten iron

A smelting method and manganese-rich slag technology, applied in the field of iron and steel metallurgy, can solve the problems of large loss of manganese resources, large fluctuations, and high residual manganese content in the final slag, achieve stable chemical composition and temperature of semi-steel, reduce production costs, and improve economic efficiency. benefit effect

Active Publication Date: 2013-03-06
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the converter is used to smelt blast furnace manganese-rich molten iron, most of the manganese in the molten iron will be oxidized and enter the slag. On the one hand, the manganese resources in the molten iron will be lost, and on the other hand, the residual manganese content in the final slag of the converter smelting will be high and fluctuate greatly. , which increases the difficulty of accurate control of steel deoxidation alloying and chemical composition, which is not conducive to the stable and smooth production of steelmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A. The temperature is 1214 ℃, the chemical composition is: C 4.10wt%, Si 0.65wt%, Mn 1.75wt%, S 0.034wt%, P 0.105wt% blast furnace manganese-rich hot metal after conventional slagging treatment, put Oxygen top-bottom double-blown converter with a nominal capacity of 50 tons, and then add low-silicon pig iron and scrap steel with Si<0.40wt% in the converter. The pig iron addition is controlled at 80kg / t steel, and the scrap steel addition is controlled at 40kg / t steel. carry out blowing;

[0016] B. When blowing, first lower the oxygen lance for blowing at a low position for 1.0 minutes, and the position of the oxygen lance is controlled at a distance of 750 mm from the muzzle to the bottom of the furnace; The mouth is 850mm away from the bottom of the furnace; after that, the gun is raised for 2.0 minutes of blowing at a high gun position, and the gun position is controlled at a distance of 950mm from the muzzle to the bottom of the furnace; finally, the gun is lowered ...

Embodiment 2

[0019] A. The temperature is 1236 ℃, the chemical composition is: C 4.70 wt%, Si 0.84 wt%, Mn 2.36 wt%, S 0.025 wt%, P 0.135 wt% blast furnace manganese-rich hot metal is subjected to conventional slag removal treatment, and then mixed with Oxygen top-bottom double-blown converter with a nominal capacity of 50 tons, and then add low-silicon (Si<0.40wt%) pig iron and steel scrap in the converter, the amount of pig iron added is controlled at 70kg / t steel, and the amount of scrap steel added is controlled at 50kg / t steel , blowing;

[0020] B. When blowing, first lower the oxygen lance for blowing at a low position for 1.5 minutes, and control the position of the oxygen lance at a distance of 850 mm from the muzzle to the bottom of the furnace; The mouth is 950mm away from the bottom of the furnace; after that, the gun is raised for 3.0 minutes of blowing at a high gun position, and the gun position is controlled at a distance of 1100mm from the muzzle to the furnace bottom; fin...

Embodiment 3

[0023] A, the temperature is 1265 ℃, the chemical composition (mass fraction) is C 5.10wt%, Si 1.02wt%, Mn 2.95wt%, S 0.046wt%, P 0.155wt% blast furnace manganese-rich hot metal is subjected to conventional slag removal treatment, After that, it is blended into an oxygen top-bottom combined blowing converter with a nominal capacity of 50 tons, and then low-silicon (Si<0.40wt%) pig iron and steel scrap are added to the converter. The amount of pig iron added is controlled at 50kg / t steel, and the amount of scrap steel added is controlled at 60kg / t steel, for blowing;

[0024] B. When blowing, first lower the oxygen lance for blowing at a low lance position for 2.0 minutes, and the position of the oxygen lance is controlled at a distance of 800 mm from the muzzle to the bottom of the furnace; The mouth is 900mm away from the bottom of the furnace; after that, the gun is raised for 3.5 minutes of blowing at a high gun position, and the gun position is controlled at a distance of...

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PUM

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Abstract

The invention provides a smelting method for producing rich-manganous slags with blast furnace rich-manganous molten iron, which comprises the following steps of adding the blast furnace rich-manganous molten iron in an oxygen top-bottom combined blowing converter; adding pig iron according to an amount of 50-80 kg / t of steel; adding waste steel according to an amount of 40-60 kg / t of steel; and under the conditions that the oxygen purity is greater than or equal to 99.5 percent; the pressure is 0.72-0.94 MPa; and the oxygen-supplying strength is 2.1-3.2 m<3> / min.t, supplying oxygen and blowing for 5-8 minutes so as to rapidly oxidize Mn and Si in the molten iron, further increase the manganese content in the slags, form the rich-manganous slags higher in level, and obtain semisteel and rich-manganous slags. The smelting method realizes efficiently recovering manganese resource in slags in the process of smelting the blast furnace rich-manganous molten iron with the converter so as to produce silicomanganese, ferromanganese and manganese metal; not only has simple manufacturing technique, but also obviously reduces production cost and improves economic benefit; at the same time stable semisteel chemical component and temperature after producing rich-manganous slags with the method are achieved; the semisteel can continuously be blowed, decarbonized, dephosphorized; and normal demands for steelmaking production is satisfied.

Description

[0001] technical field [0002] The invention relates to a smelting method, in particular to a smelting method for producing manganese-rich slag by using manganese-rich molten iron in a blast 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. With the diversification of iron ore sources for blast furnaces, blast furnaces often use some iron ores with high manganese content, and most of the molten iron smelted contains high manganese (Mn 1.75-2.95 wt%). When the converter is used to smelt blast furnace manganese-rich molten iron, most of the manganese in the molten iron will be oxidized and enter the slag. On t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C5/36C21B3/04
CPCY02P10/20Y02W30/50
Inventor 李金柱陈伟张卫强赵卫东杨春雷章祝雄
Owner WUKUN STEEL