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A method for efficient utilization of high manganese pig iron

A high manganese, pig iron technology, applied in the field of pig iron, can solve problems such as many shortcomings

Active Publication Date: 2021-09-14
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, under the current conditions of strict environmental protection requirements, this solution has many disadvantages.

Method used

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  • A method for efficient utilization of high manganese pig iron
  • A method for efficient utilization of high manganese pig iron
  • A method for efficient utilization of high manganese pig iron

Examples

Experimental program
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Effect test

Embodiment 1

[0068] In the method for high-efficiency utilization of high manganese pig iron provided in this embodiment, the purpose of smelting high manganese pig iron is to achieve the purpose of smelting high manganese pig iron by supplying oxygen through an oxygen lance in a 500t induction furnace and blowing nitrogen into the bottom blowing to stir the molten pool.

[0069] In the demanganization and carbon preservation period, 200kg of high manganese pig iron, its chemical composition is C 3.6%, Si≤0.01%, Mn 8.34%, P0.14%, S 0.02%, the rest is Fe and trace unavoidable impurities; The power is 120kw; the oxygen supply intensity is 0.6Nm 3 / (t·min), the end point temperature is controlled at 1350°C, iron ore is added to cool down during the blowing process, 13kg / t iron ore is added every 2min, and the amount of iron ore added is 130kg / t. The oxygen supply time is 34min, and the oxygen supply volume is 4.08m 3 , the bottom blowing gas supply intensity is 0.12Nm 3 / (t min); After blow...

Embodiment 2

[0072] In the method for high-efficiency utilization of high-manganese pig iron provided in this embodiment, oxygen is supplied through an oxygen lance in a 500 t induction furnace, and nitrogen is blown into the bottom blowing to stir the molten pool, so as to obtain the purpose of smelting high-manganese pig iron.

[0073] In the demanganization and carbon preservation period, 250kg of high manganese pig iron, its chemical composition is C 4.0%, Si 0.008%, Mn 9.42%, P0.13%, S 0.02%, the rest is Fe and trace unavoidable impurities; the heating power 120kw; oxygen supply intensity is 1.0Nm 3 / (t min), the end point temperature is controlled at 1300°C, iron ore is added to cool down during the blowing process, and the amount of iron ore added is 138kg / t; the oxygen supply time is 25min, and the oxygen supply amount is 6.25m 3 , the bottom blowing gas supply intensity is 0.12Nm 3 / (t·min). After blowing, pour out high manganese slag, its chemical composition is Fe 2 o 3 15.2...

Embodiment 3

[0076] In the method for high-efficiency utilization of high manganese pig iron provided in this embodiment, the purpose of smelting high manganese ferromanganese is obtained by supplying oxygen through an oxygen lance in a 500t induction furnace, and blowing nitrogen into the bottom blowing to stir the molten pool.

[0077] In the demanganization and carbon preservation period, 150kg of high manganese pig iron, its chemical composition is C 4.2%, Si 0.009%, Mn 10.12%, P 0.11%, S 0.021%, the rest is Fe and trace unavoidable impurities; the oxygen supply intensity is 1.2Nm 3 / (t·min), the end point temperature is controlled at 1400°C, iron ore is added to cool down during the blowing process, and the amount of iron ore added is 140kg / t. The oxygen supply time is 25min, and the oxygen supply volume is 4.5m 3 , the bottom blowing gas supply intensity is 0.10Nm 3 / (t·min). After blowing, pour out high manganese slag, its chemical composition is Fe 2 o 3 15.6%, MnO 76.4%, SiO ...

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Abstract

The invention discloses a method for efficiently utilizing high-manganese pig iron, which belongs to the technical field of pig iron. The invention solves the problems in the prior art that the high manganese pig iron has low economic benefit and the service life of the furnace lining is easily reduced when the high manganese pig iron is used. The blowing process of the above-mentioned high manganese pig iron is divided into two stages, the first stage is the manganese removal and carbon retention period to produce high manganese slag, and the second stage is the decarbonization and dephosphorization period to obtain clean molten steel. The above preparation method is simple and easy to control, the obtained high manganese slag can be used as a raw material for preparing high carbon ferromanganese, and the obtained molten steel can be used as a raw material for other steelmaking. The invention can be used to realize the regeneration and utilization of high manganese pig iron, and the economic benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of pig iron, and in particular relates to a method for efficiently utilizing high-manganese pig iron. Background technique [0002] The manganese-rich slag furnace reduces the iron in the ore with low manganese content to molten iron, and retains the manganese in the slag to become manganese-rich slag (containing 30% to 35% manganese), which is used as the raw material for smelting ferromanganese and ferrosilicomanganese The chemical composition of by-products (i.e. high manganese pig iron) is: C: 3.5% ~ 5.2%, Si: ≤0.01%, Mn: 7.0% ~ 11.0%, P: 0.12% ~ 0.22%, S: 0.01 %~0.030%, the rest is Fe and trace unavoidable impurities. [0003] At present, in the method of using the by-product high manganese pig iron, the usual method is to directly mix the high manganese hot metal into the converter for steelmaking. In this method, the price of high manganese pig iron is generally 2800-3000 yuan / ton. Simple, you can e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C5/54
CPCC21C5/5241C21C5/527C21C5/54Y02P10/20
Inventor 杨勇吴伟梁强孟华栋吴巍倪冰高琦赵斌汪成义
Owner CENT IRON & STEEL RES INST
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