CN101921890B - Method for recycling manganese element of pour exceed steel ingot - Google Patents

Method for recycling manganese element of pour exceed steel ingot Download PDF

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CN101921890B
CN101921890B CN201010259435XA CN201010259435A CN101921890B CN 101921890 B CN101921890 B CN 101921890B CN 201010259435X A CN201010259435X A CN 201010259435XA CN 201010259435 A CN201010259435 A CN 201010259435A CN 101921890 B CN101921890 B CN 101921890B
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pour
steel ingot
exceed
frequency induction
furnace
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CN101921890A (en
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杨利忠
郝旭明
韩杰宇
李学超
陈政
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P10/20Recycling

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Abstract

The invention relates to a method for recycling manganese element from the pour exceed steel ingot. The method is based on the existing technological process which comprises the following steps: EBT electric furnace smelting, LF furnace smelting and VD furnace smelting and die casting; an additional medium frequency induction furnace is used in the method of the invention, after molten steel is used in the pouring of the die casting working procedure, the residual molten steel is solidified to form a pour exceed steel ingot, slagging is performed in the medium frequency induction furnace, the pour exceed steel ingot is molten; and after the melting step in the medium frequency induction furnace is completed and the tapping temperature and the tapping quantity are determined, and the molten steel is poured in an LF furnace refining ladle and performs refining treatment in the LF furnace with the molten steel after the BET electric furnace smelting. The recycling method of the invention has less investment and small floor space; manganese element in the pour exceed steel ingot can be effectively recycled, the amount of the LF furnace manganese alloy is reduced, the steelmaking cost is lowered; and the difficult problems of decarburization and dephosphorization can be avoided after the pour exceed steel ingot with high manganese content is added in the electric furnace.

Description

A kind of recovery method of manganese element of pour exceed steel ingot
Technical field
The present invention relates to a kind of a kind of method that manganese element of pour exceed steel ingot reclaims of making steel.
Background technology
At present, EBT electric furnace+LF stove+VD stove (RH stove)+die casting is a kind of technical process that domestic steel-making is extensively adopted.If the kind that the LF stove is smelted only contains C, Si, Mn, P, S element; All the other element Cr, Mo, Ni etc. are residual element (the element percentage composition must not surpass 0.30%); Then smelt, pour into a mould and finish, the residue molten steel injects waste and old ingot mold and solidifies, and is frozen into (abbreviation pour exceed steel ingot) behind the steel ingot; Through cutting processing granularity is diminished, smelt as the raw scrap material electric furnace of packing into once more then.
Yet the problem that adopts this kind process method to bring is: pour exceed steel ingot is as the raw scrap material electric furnace of packing into; Not only in EBT electrosmelting process, cause the loss of the Mn element more than 80%; And if pour exceed steel ingot contains Mn higher (manganese percentage composition >=10.0%); Pack into behind the electric furnace with the molten iron raw material, cause very big difficulty also can for electric furnace decarburization, dephosphorization.
Summary of the invention
In order to overcome the above-mentioned deficiency of the recovery method that has manganese element of pour exceed steel ingot now; The present invention provides a kind of recovery method of manganese element of pour exceed steel ingot; Present method efficient recovery the manganese element in the pour exceed steel ingot; Reduced the add-on of LF stove manganese alloy, avoided containing the higher pour exceed steel ingot of manganese simultaneously again and added decarburization, the dephosphorization difficult problem that causes behind the electric furnace.
The existing processes flow process is: EBT electric furnace-LF stove-VD stove-die casting.
Cause the loss of Mn element in order to overcome pour exceed steel ingot as the raw scrap material electric furnace of packing into, the present invention is provided with a medium-frequency induction furnace in addition in original technical process, melt pour exceed steel ingot by medium-frequency induction furnace, has avoided the oxidational losses of manganese element.The disclosed for reference electric furnace of the applicant, LF furnace apparatus significant parameter are referring to table 1.
Figure DEST_PATH_GSB00000677179700021
The disclosed for reference medium-frequency induction furnace device parameter of the applicant is seen table 2.
Figure DEST_PATH_GSB00000677179700022
Explain:
1, the pour exceed steel ingot that forms requires only to contain C, Si, Mn, P, S element, all the other elements as: Cr, Mo, Ni etc. are residual element;
2, like the pour exceed steel ingot overall dimensions greater than the medium-frequency induction furnace internal diameter, in the medium-frequency induction furnace stove of can not all packing into, must process pour exceed steel ingot and cut for a short time, guarantee that pour exceed steel ingot all can pack in the medium-frequency induction furnace stove; If less than the medium-frequency induction furnace internal diameter, can packing into fully, the pour exceed steel ingot overall dimensions in the medium-frequency induction furnace stove, melt in the medium-frequency induction furnace of can directly packing into.
The technical scheme of the recovery method of this manganese element of pour exceed steel ingot is:
It is existing steps in sequence be that EBT electrosmelting, LF stove are smelted, VD stove (RH stove) is smelted with the die casting process flow process in; Other drops into a medium-frequency induction furnace; Molten steel is after the cast of die casting operation; Form pour exceed steel ingot behind the residue molten steel solidification, in medium-frequency induction furnace, carry out slag making, pour exceed steel ingot is melted.Medium-frequency induction furnace fusing finishes, confirm tapping temperature and tap after, pour the molten steel after melting into LF stove refining ladle, in the LF stove, carry out refining treatment with the molten steel one behind the EBT electrosmelting.
Specifically, the steps characteristic of the recovery method of this manganese element of pour exceed steel ingot is:
The I slag making:
After pour exceed steel ingot fusing, the molten steel oxidation and the manganese element evaporation that cause in the boiling of temperature-rise period invar water in the pour exceed steel ingot Medium frequency induction stokehold of packing into, add lime (Cao), the fluorite (CaF of granularity 3~5mm earlier at the furnace bottom of medium-frequency induction furnace 2) slag charge, add surplus steel ingot then, guarantee all fusings fast of slag charge, cover molten steel, avoid molten steel oxidation.
The proportion by weight of a lime and fluorite is:
Fluorite 1; Lime 3.6~4.4.
The best is: fluorite 1; Lime 4.0.
The total slag charge add-on of b adds by 8~10Kg/ ton steel according to molten steel water yield decision in the stove;
II confirms tapping temperature:
The pour exceed steel ingot of different steel grades, medium-frequency induction furnace fusing back tapping temperature are confirmed according to the liquidus temperature of this steel grade, 100~130 ℃ of general high this steel grade liquidus temperatures of tapping temperature.
III is confirmed tap:
(1) if the percentage composition of Mn is no more than the upper limit requirement that the LF stove is smelted kind Mn percentage composition in the pour exceed steel ingot, then the medium-frequency induction furnace tap does not receive the technical limitation of Mn element height, and tap is worked as furnace output according to the LF stove and required to determine.As: it is 60 tons that the LF furnace output requires, and before the medium-frequency induction furnace molten steel does not add, 52 tons on molten steel is only arranged in the LF stove, and then the intermediate frequency furnace tap is 8 tons (60-52=8).
(2), can smelt the demand of kind according to the LF stove, by conventional LF stove alloy adjustment method of calculation, decision medium-frequency induction furnace tap to Mn content if the percentage composition of pour exceed steel ingot Mn surpasses the upper limit requirement that the LF stove is smelted kind Mn percentage composition.
The recovery method of this manganese element of pour exceed steel ingot is invested lessly, and floor space is little, efficient recovery the manganese element in the pour exceed steel ingot, reduced the add-on of LF stove manganese alloy, reduced steel-making cost; The pour exceed steel ingot of having avoided again simultaneously containing manganese higher (manganese percentage composition >=10.0%) adds decarburization, the dephosphorization difficult problem that causes behind the electric furnace.
Specific embodiment
Specify the embodiment of the recovery method of manganese element of pour exceed steel ingot below in conjunction with embodiment, but the embodiment of the recovery method of this manganese element of pour exceed steel ingot is not limited to following embodiment.
Embodiment one
Present embodiment EBT electric furnace, LF stove, VD stove nominal capacity are: 60 tons, medium-frequency induction furnace nominal melt is: 8 tons.
7 tons of medium-frequency induction furnace fusing LZ50 axle steel pour exceed steel ingots, the quality per distribution ratio of pour exceed steel ingot is:
Mn?0.75%;C?0.50;?Si?0.27;P?0.007;S?0.002;
Cr?0.05; Mo?0.01;Ni?0.02;Cu?0.02;
All the other are Fe and unavoidable impurities.
The LF stove is smelted kind: (the Mn percentage composition requires the LZ50 kind: 0.70%~0.80%).The lime (CaO), the fluorite (CaF that add granularity 3~5mm before the fusing earlier at the furnace bottom of medium-frequency induction furnace 2) slag charge (proportioning: 4: 1) 60Kg, adding 7 tons on surplus steel ingot then, the pour exceed steel ingot fusing after temperature reaches 1610 ℃, is all poured LF stove refining ladle into, in the LF stove, carries out refining together with 52 tons of molten steel behind the EBT electrosmelting.(the LF furnace output requires: the 59-61 ton).
The quality per distribution ratio of the composition of the molten steel behind the EBT electrosmelting is:
Mn?0.10;C?0.35;?Si?0.01;P?0.006;S?0.020;
Cr?0.05;Mo?0.01;Ni?0.02;Cu?0.02;
All the other are Fe and unavoidable impurities.
Smelt by routine at the LF stove and to smelt, leave station, carry out the vacuum-treat of VD stove when the quality per distribution ratio of the composition of molten steel reaches the following LF of requirement refining ladle:
Mn?0.75;C?0.50;?Si?0.27;P?0.007;S?0.002;
Cr?0.05;Mo?0.01;Ni?0.02;Cu?0.02;
All the other are Fe and unavoidable impurities.
The VD liquid steel degassing is handled
By the ordinary method processing that outgases.
The degassing disposes, and casts 7 high 2.3m, and the steel ingot of section: 0.8m * 0.6m also remains the 2.8t molten steel after the casting, remaining molten steel is poured into waste and old ingot mold solidify, and is frozen into steel ingot.This steel ingot is added the medium-frequency induction furnace fusing again.
This stove LF stove reduces high manganese: 60~70Kg.
Explain:
1, in the present embodiment; Because the pour exceed steel ingot overall dimensions are greater than the medium-frequency induction furnace internal diameter; Fail all to pack in the medium-frequency induction furnace stove, therefore pour exceed steel ingot has been carried out certain overall dimensions processing, till guaranteeing that pour exceed steel ingot all can be packed in the medium-frequency induction furnace stove.
2, in the present embodiment; The percentage composition of pour exceed steel ingot Mn (0.75%) is no more than the LF stove and smelts the upper limit of LZ50 kind Mn percentage composition and require that (LZ50 kind Mn content requirement is 0.70-0.80%; It is 0.80% that the upper limit requires); The medium-frequency induction furnace tap does not receive the technical limitation of Mn element height, requires the decision tap according to the LF furnace output.Before the LF stove did not add the medium-frequency induction furnace molten steel, the molten steel amount was 52 tons, and the output requirement is: the 59-61 ton so 7 tons of molten steel in the medium-frequency induction furnace are all gone out to the greatest extent, joins in the LF stove ladle.
Embodiment two
Present embodiment EBT electric furnace, LF stove, VD stove nominal capacity are: 60 tons, medium-frequency induction furnace nominal melt is: 8 tons.
5 tons of medium-frequency induction furnace fusing Mn13 steel grade pour exceed steel ingots, the quality per distribution ratio of pour exceed steel ingot is:
Mn?13.5%;C 1.25;Si?0.20;P?0.009;S?0.003;
Cr?0.05; Mo?0.02;Ni?0.03;Cu?0.02;
All the other are Fe and unavoidable impurities.
The LF stove is smelted kind: (the Mn percentage composition requires the LZ50 kind: 0.70%-0.80%), add lime (CaO), the fluorite (CaF of granularity 3~5mm before the fusing earlier at the furnace bottom of medium-frequency induction furnace 2) slag charge (proportioning: 4: 1) 40Kg, adding 5 tons on surplus steel ingot then, the pour exceed steel ingot fusing after temperature reaches 1500 ℃, is poured 3 tons of LF stove refining ladle (3 tons of taps) into,, in the LF stove, carry out refining together with 53 tons of molten steel behind the EBT electrosmelting.
The quality per distribution ratio of the composition of the molten steel behind the EBT electrosmelting is:
Mn?0.0.8;C?0.40;?Si?0.01;P?0.006;S?0.025;
Cr?0.05;?Mo?0.01;Ni?0.02;Cu?0.01;
All the other are Fe and unavoidable impurities.
Smelt by routine at the LF stove and to smelt, leave station, carry out the vacuum-treat of VD stove, by the ordinary method processing that outgases when the quality per distribution ratio of the composition of molten steel reaches the following LF of requirement refining ladle.
Mn?0.74;C?0.51;?Si?0.26;P?0.005;S?0.001;
Cr?0.05;Mo?0.01;Ni?0.02;Cu?0.02;
All the other are Fe and unavoidable impurities.
The degassing disposes, and casts 7 high 2.3m, and the steel ingot of section: 0.8m * 0.6m also remains the 3.0t molten steel after the casting, remaining molten steel is poured into waste and old ingot mold solidify, and is frozen into steel ingot.This steel ingot is added the medium-frequency induction furnace fusing again.
This stove reduces high manganese: 480-500Kg.
Explain:
1, in the present embodiment, the Mn13 pour exceed steel ingot of medium-frequency induction furnace fusing is because the percentage composition of pour exceed steel ingot Mn is: 13.5%; Surpassing the LF stove smelts the upper limit requirement of Mn percentage composition of kind LZ50 (LZ50 kind Mn content requirement is 0.70-0.80%; It is 0.80% that the upper limit requires), therefore by conventional LF stove alloy adjustment method of calculation, trying to achieve the medium-frequency induction furnace tap is 3 tons; All the other are still stayed in the stove, as the subsequent use alloy raw material of next heat of LF stove.
2, in the present embodiment, Mn13 pour exceed steel ingot overall dimensions, can be walked in the medium-frequency induction furnace of directly packing into to melt in the medium-frequency induction furnace stove of can packing into fully less than the medium-frequency induction furnace internal diameter, needn't carry out overall dimensions processing.
Among above-mentioned two embodiment, EBT electric furnace, LF stove, VD stove, die casting are operated by the common process requirement.

Claims (2)

1. the recovery method of a manganese element of pour exceed steel ingot; It is existing steps in sequence be that EBT electrosmelting, LF stove are smelted, the VD stove is smelted with the die casting process flow process in; Other drops into a medium-frequency induction furnace, and molten steel forms pour exceed steel ingot behind the residue molten steel solidification after the cast of die casting operation; In medium-frequency induction furnace, carry out slag making, pour exceed steel ingot is melted; Medium-frequency induction furnace fusing finishes, confirm tapping temperature and tap after, pour the molten steel after melting into LF stove refining ladle, in the LF stove, carry out refining treatment with the molten steel one behind the EBT electrosmelting.
2. the recovery method of manganese element of pour exceed steel ingot according to claim 1 is characterized in that:
The I slag making
In the pour exceed steel ingot Medium frequency induction stokehold of packing into, add lime, the fluorite slag charge of granularity 3~5mm earlier at the furnace bottom of medium-frequency induction furnace;
The proportion by weight of a lime and fluorite is:
Fluorite 1 lime 3.6~4.4
B slag charge add-on is 8~10Kg/ ton steel;
II confirms tapping temperature
Medium-frequency induction furnace fusing back tapping temperature is confirmed according to the liquidus temperature of this steel grade, 100~130 ℃ of high this steel grade liquidus temperatures of tapping temperature.
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CN1804047A (en) * 2006-01-19 2006-07-19 邯郸钢铁股份有限公司 Method for reclaiming and cyclic utilizing residue molten steel slag in steel making

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CN1804047A (en) * 2006-01-19 2006-07-19 邯郸钢铁股份有限公司 Method for reclaiming and cyclic utilizing residue molten steel slag in steel making

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JP特开2009-68068A 2009.04.02

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