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Method for preparing high carbon ferromanganese from high-manganese slag

A high-carbon ferromanganese and high-manganese technology, which is applied in the field of preparing high-carbon ferromanganese, can solve the problems of reduced furnace lining life, low melting point of slag, low economic benefits, etc., and achieves the effects of energy saving, light erosion and significant economic benefits.

Active Publication Date: 2020-06-19
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, for some high-manganese pig iron with high phosphorus content, for example, it contains C 4.0%-5.0%, Mn 8%-10%, P 0.18%-0.20%, S 0.015%-0.02%, and the rest is Fe and trace unavoidable impurities; due to the high phosphorus content contained in it, if it is used as a metal raw material for converter or electric furnace smelting, it will bring greater difficulty to the converter or electric furnace smelting, and the slag rich in MnO has a low melting point and low viscosity. The erosion of the furnace lining is very serious, which reduces the life of the furnace lining. From the perspective of blowing time, it will also be extended by 1.5 times. From the perspective of comprehensive cost, the economic benefit is low

Method used

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  • Method for preparing high carbon ferromanganese from high-manganese slag
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  • Method for preparing high carbon ferromanganese from high-manganese slag

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preparation example Construction

[0043] It should be noted that in S1, the preparation method of high manganese slag adopts oxygen supply to oxidize iron and manganese in high manganese iron water. Specifically, it includes the following steps: loading high manganese pig iron into an induction furnace, induction heating, heating power It is 110~130kw (for example, 120kw). When the molten iron is melted, measure the temperature of the molten iron. When the temperature of the molten iron is 1300°C, start blowing oxygen with an oxygen lance; the blowing process adopts a lower oxygen supply intensity O1 (for example, 0.5~ 2.0Nm 3 / (t·min)), the oxygen supply is 20~30m 3 / t, the oxygen blowing time is 10~60min; after the blowing starts, nitrogen is blown into the bottom blowing, and the gas supply intensity is 0.02~0.20Nm 3 / (t·min), until the end of blowing; pour out the high manganese slag, leaving semi-steel.

[0044] Specifically, during blowing, in order to lower the temperature of molten iron, iron ore (ma...

Embodiment 1

[0073] In the method for preparing high-carbon ferromanganese by utilizing high manganese slag provided in this embodiment, first, in a 500t induction furnace, oxygen supply is used to oxidize iron and manganese in high manganese ferromanganese water through an oxygen lance, and the generated iron oxide and manganese oxide enter the slag, pour After the slag is discharged, high manganese slag is formed as a raw material for preparing high carbon ferromanganese. Specifically, 200kg of high manganese pig iron, its chemical composition is C 4.46%, Si 0.01%, Mn 8.78%, P 0.18%, S 0.015%, the rest is Fe and trace unavoidable impurities; 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, and the amount of iron ore added is 130kg / t; the oxygen blowing time is 34min, and the oxygen supply amount is 4.08m 3 , the bottom blowing gas supply intensity is 0.12Nm 3 / (t min); after blo...

Embodiment 2

[0076] In the method for preparing high-carbon ferromanganese by utilizing high manganese slag provided in this embodiment, first, in a 500t induction furnace, oxygen supply is used to oxidize iron and manganese in high manganese ferromanganese water through an oxygen lance, and the generated iron oxide and manganese oxide enter the slag, pour After the slag is discharged, high manganese slag is formed as a raw material for preparing high carbon ferromanganese. Specifically, 250kg of high manganese pig iron, its chemical composition is C 4.56%, Si 0.008%, Mn 8.89%, P 0.19%, S 0.017%, the rest is Fe and trace unavoidable impurities; the oxygen supply intensity is 1.0Nm 3 / (t min), the end point temperature is controlled at 1340°C, iron ore is added to cool down during the blowing process, and the amount of iron ore added is 138kg / t; the oxygen blowing 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 b...

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Abstract

The invention discloses a method for preparing high carbon ferromanganese from high-manganese slag, and belongs to the technical field of high carbon ferromanganese. The problems that in the prior art, when high carbon ferromanganese is prepared from conventional manganese ores, the service life of a furnace lining is likely to be shortened, cost is low, and the production efficiency is low are solved. The method comprises the following steps that S1, the high-manganese slag and carbon powder are prepared into cold-bound pellets; and S2, the cold-bound pellets are put in a resistance furnace or an induction furnace or an electric furnace, the cold-bound pellets are heated to 1400 DEG C to 1500 DEG C, lime is added as a desulfurizing agent, and the high carbon ferromanganese can be obtained. The preparation method is simple and easy to control, and the prepared high carbon ferromanganese accords with national standard requirements. The method can be used for preparing the high carbon ferromanganese.

Description

technical field [0001] The invention belongs to the technical field of high-carbon ferromanganese, and in particular relates to a method for preparing high-carbon ferromanganese by using high-manganese slag. Background technique [0002] At present, for some high-manganese pig iron with high phosphorus content, for example, it contains 4.0%-5.0% of C, 8%-10% of Mn, 0.18%-0.20% of P, 0.015%-0.02% of S, and the rest is Fe and trace unavoidable Impurities; due to the high phosphorus content contained in it, if it is used as a metal raw material for converter or electric furnace smelting, it will bring greater difficulty to the smelting of converter or electric furnace, and the slag rich in MnO has a low melting point and low viscosity. The erosion of the furnace lining is very serious, which reduces the life of the furnace lining. From the perspective of blowing time, it will also be extended by 1.5 times. From the perspective of comprehensive cost, the economic benefit is low....

Claims

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Application Information

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IPC IPC(8): C22B1/248C21B11/10C22C33/04C22C38/04
CPCC21B11/10C22B1/248C22C33/04C22C38/04
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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