CN100564546C - A kind of earlier stage slag-smelting method for pre-smelting electric furnace - Google Patents
A kind of earlier stage slag-smelting method for pre-smelting electric furnace Download PDFInfo
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- CN100564546C CN100564546C CNB2008100547770A CN200810054777A CN100564546C CN 100564546 C CN100564546 C CN 100564546C CN B2008100547770 A CNB2008100547770 A CN B2008100547770A CN 200810054777 A CN200810054777 A CN 200810054777A CN 100564546 C CN100564546 C CN 100564546C
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- slag
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- decarburization
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Abstract
A kind of earlier stage slag-smelting method for pre-smelting electric furnace, it comprises following sequential steps: one, make the high-temperature liquid state pre-melted slag, the rhombspar that in the molten iron that is added to the hot metal pretreatment stove, adds molten iron 16kg per ton～20kg lime and 3kg～4kg, carry out adding again after the decarburization hyperthermic treatment rhombspar of molten iron 16kg per ton～40kg lime and 3kg-6kg, add molten iron 16kg per ton～40kg lime behind the 13min-15min once more, blowing back carbon content 1.5%～2.5%, 1530～1560 ℃ of temperature; Two, electric furnace charging: at the steel scrap that empty stove adds, pack into then decarburization molten iron and high-temperature liquid state pre-melted slag; Three, electrosmelting: the electric furnace hot metal charging begins to send electricity, oxygen blast to flux, molten steel C:0.09～0.15%, Si≤0.10%, P≤0.015%, 1670 ℃～1700 ℃ electric furnace steel tappings of temperature after finishing.This earlier stage slag-smelting method for pre-smelting electric furnace improves the dephosphorization utilization ratio of lime, shortens the tap to tap time of electric furnace.
Description
Technical field
The present invention relates to a kind of earlier stage slag-smelting method for pre-smelting electric furnace.
Background technology
Along with the utilization of electric furnace hot metal charge technology, electric furnace hot metal charge technology has also obtained very big development, and molten steel decarburization hyperthermic treatment method is exactly one of them.The main purpose that electric furnace is made the slag in early stage is that dephosphorization, decarburization, removal are mingled with.Dephosphorization, these two reactions of decarburization all require slag to have higher oxidisability and flowability.The main method that existing electric furnace is made the slag in early stage is to add 1～1.5% slag making material into the stove metal charge at furnace bottom before charging, at scrap melting process fusing slag making materials, and takes the limit to add slag charge limit stream slag operation simultaneously.Electrosmelting a part of heat in earlier stage is used to melt slag making materials like this, part heat is used for melting waste steel, and the physics of electric furnace slag at this moment, electrochemical conditions and dynamic conditions are relatively poor, and the lime in the slag is fusing fully not, can not effectively finish the high efficiency dephosphorating task.Influence the rhythm of production of electric furnace, consumed a large amount of physics heat simultaneously, increased lime consumption.
Summary of the invention
Make the deficiency of slag method in early stage in order to overcome above-mentioned existing electric furnace, the invention provides a kind of earlier stage slag-smelting method for pre-smelting electric furnace, this earlier stage slag-smelting method for pre-smelting electric furnace improves the dephosphorization utilization ratio of lime, shortens the tap to tap time of electric furnace.
This earlier stage slag-smelting method for pre-smelting electric furnace comprises following sequential steps:
One makes the high-temperature liquid state pre-melted slag
1250～1400 ℃ blast-melted or melten iron in hot-metal mixer is added to the hot metal pretreatment stove, change the hot metal pretreatment stove over to molten steel decarburization intensification station, add lime and rhombspar by high hopper, it is the rhombspar that molten iron per ton adds 16kg～20kg lime and 3kg～4kg that first slag charge adds pan feeding, begin to carry out the decarburization hyperthermic treatment after the adding, add second batch of slag charge behind 9min～12min, molten iron per ton adds the rhombspar of 16kg～40kg lime and 3kg～6kg, add the 3rd batch of slag charge behind 13min～15min, molten iron per ton adds 16kg～40kg lime, continue blowing 10min～15min, the thermometric sampling, when carbon content 1.5～2.5%, 1530～1560 ℃ of temperature, offer electric furnace and use.The summation of three add-ons of slag making materials is to handle 6%～10% of iron water amount weight.
The charging of two electric furnaces:
Before the electric furnace charging is empty stove, and furnace bottom does not overlay the bedstone ash, adorns steel scrap earlier, and the steel scrap amount of adding is for adding the 40%-50% of the total iron and steel stock weight of electric furnace.The decarburization molten iron and the high-temperature liquid state pre-melted slag of packing into then and being provided by the decarburization heat riser, high-temperature liquid state pre-melted slag are the 6.7%-9% of the blast-melted or melten iron in hot-metal mixer weight of decarburization.Convert and forbid slag to flow out in the iron process from the electric furnace fire door;
Three electrosmeltings:
After the electric furnace hot metal charging finishes, begin to send electricity, oxygen blast flux (blowing oxygen quantity during by oxygen gun blowing gas flow and the carbon content that will oxidize away calculate and obtain, usually consume 40～60 cubic metres of/ton steel in whole electrosmelting process), do not add the lime residue adjustment between melting period, do not flow slag operation, when liquid steel temperature reaches 1560 ℃ yet, steel scrap in the electric furnace all melts, be generally 1560 ℃～1580 ℃, sampling analysis, and begin to flow slag operation.If P in the molten steel 〉=0.025% enters oxidation period and begins to add lime and rhombspar slag making materials, molten steel per ton adds 10Kg～15Kg lime and 4～6Kg rhombspar, if P in the molten steel≤0.025% is then no longer added lime and rhombspar slag making materials.In whole smelting process, keep foamy slag height 〉=500mm, be generally 500mm～1000mm.Require C:0.09～0.15%, Si≤0.10%, P≤0.015% below the satisfying of carbon in the molten steel, silicon and phosphorus, electric furnace steel tapping during 1670 ℃～1700 ℃ of temperature.
Above-mentioned molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace, it is characterized in that: at step 2 electric furnace when filling with substance, after adding decarburization molten iron and high-temperature liquid state pre-melted slag, be blended into untreated blast-meltedly again, the untreated blast-melted amount that is blended into is 30%～50% of a decarburization weight of molten iron.
This molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace has following advantage:
1. electric furnace slag in early stage dissolves back power supply stove use by the decarburization heat riser, alleviates the furnace melting burden, has improved the effect of utilizing of lime, improves the dephosphorization utilization ratio of lime, shortens the tap to tap time of electric furnace, improves the rhythm of production of electric furnace; 2. the high-temperature liquid state slag of electric furnace employing molten steel decarburization heat riser generation has reduced electric furnace lime adding amount 25～30Kg/ ton steel as slag use in early stage, simultaneously owing to contain a large amount of Fe
2O
3Help the dephosphorization and the formation of electric furnace foamy slag in early stage of electric furnace Deng oxide compound, shortened tap to tap time, reduced power consumption; 3. electric furnace employing molten steel decarburization heat riser is that electric furnace is made the slag in early stage, can obviously reduce smelting cost, does not adopt molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace to compare with existing, and general every stove can reduce by 800 yuan.
Embodiment
Describe the embodiment of this molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace in detail below in conjunction with embodiment, but the embodiment of this molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace is not limited to following embodiment.
Embodiment one
Present embodiment is to adopt steel scrap to add decarburization intensification molten iron smelting with 50 tons of electric furnaces.
This molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace embodiment is a following sequential steps:
One makes the high-temperature liquid state pre-melted slag
The blast-melted hot metal pretreatment stove that is added to 30 tons 1310 ℃ changes the hot metal pretreatment stove over to molten steel decarburization intensification station, is added the rhombspar of 500Kg lime and 100Kg by high hopper, begin to carry out the decarburization hyperthermic treatment, add second batch of slag charge behind the 10min, add-on is 1000Kg lime and 200Kg rhombspar, adds the 3rd batch of slag charge behind the 15min, add-on is a 1000Kg lime, continue blowing 12min, thermometric sampling, carbon content 2.1%, during 1530 ℃ of temperature, offer electric furnace and use.
The charging of two electric furnaces:
Before the electric furnace charging is empty stove, and furnace bottom does not overlay the bedstone ash, adorns 25 tons of steel scraps earlier, the decarburization molten iron and the high-temperature liquid state pre-melted slag of packing into then and providing by the decarburization heat riser, 30 tons of iron water amounts, 2.7 tons of high-temperature liquid state pre-melted slags are converted and are forbidden slag to flow out from the electric furnace fire door in the iron process;
Three electrosmeltings:
After the electric furnace hot metal charging finishes, begin to send electricity, oxygen blast to flux (consuming 40 cubic metres of/ton steel), do not add the lime residue adjustment between melting period, also do not flow slag operation in whole electrosmelting process, 1560 ℃ of liquid steel temperatures, sampling analysis, and begin to flow slag operation.P in the molten steel 〉=0.025% enters oxidation period and begins to add lime 12Kg/ ton steel, rhombspar 5Kg/ ton steel slag making materials.P in the molten steel≤0.025% is not then being added lime and rhombspar slag making materials.In whole smelting process, keep the foamy slag height greater than 500mm (be controlled at 500mm～1000mm), require C:0.09%, Si≤0.10%, P≤0.015% below the carbon in the molten steel, silicon and phosphorus are satisfied, during 1690 ℃ of temperature, electric furnace steel tapping.
Embodiment two
Present embodiment is to adopt steel scrap to add decarburization intensification molten iron smelting with 50 tons of electric furnaces.
This molten steel decarburization heat riser earlier stage slag-smelting method for pre-smelting electric furnace embodiment is a following sequential steps:
One makes the high-temperature liquid state pre-melted slag
25 tons 1270 ℃ melten iron in hot-metal mixer is added to the hot metal pretreatment stove, changes the hot metal pretreatment stove over to molten steel decarburization intensification station, add 500Kg lime and 100Kg rhombspar by high hopper, begin to carry out the decarburization hyperthermic treatment, add second batch of slag charge behind the 10min, add-on is 500Kg lime and 100Kg rhombspar, adds the 3rd batch of slag charge behind the 15min, add-on is a 1000Kg lime, continue blowing 10min, thermometric sampling, carbon content 1.5%, during 1530 ℃ of temperature, offer electric furnace and use.
The charging of two electric furnaces:
Before the electric furnace charging is empty stove, furnace bottom does not overlay the bedstone ash, adorn 10 tons of steel scraps earlier, the decarburization molten iron and the high-temperature liquid state pre-melted slag of packing into then and providing by the decarburization heat riser, wherein iron water amount is 25 tons, 2.7 tons of high-temperature liquid state pre-melted slags, be blended into again 10 tons untreated blast-melted, convert and forbid slag to flow out in the iron process from the electric furnace fire door;
Three electrosmeltings:
After electric furnace is converted the iron end, begin to send electricity, oxygen blast to flux (consuming 50 cubic metres of/ton steel), do not add the lime residue adjustment between melting period, also do not flow slag operation in whole electrosmelting process, 1560 ℃ of liquid steel temperatures, sampling analysis, and begin to flow slag operation.P in the molten steel 〉=0.025% enters oxidation period and begins to add lime 400Kg/ stove (8～12Kg/ ton steel), rhombspar 200Kg/ stove (3～5Kg/ ton steel) slag making materials.In whole smelting process, keep foamy slag height 〉=500mm (to be controlled at 500mm～1000mm).Below satisfying, carbon in the molten steel, silicon and phosphorus requires C: when≤0.09%, Si≤0.10%, P≤0.015%, 1690 ℃ of temperature, and electric furnace steel tapping.
Note:
The steely iron water that the said composition blast-melted or melten iron in hot-metal mixer of 1 present specification complies with the national standard requirements requires (weight proportion) to be to carbon, silicon, phosphorus and sulphur in the molten iron:
Carbon: 3.50%～4.50%, silicon: be not more than 0.80%, phosphorus is not more than 0.40%, and sulphur is not more than 0.07%.
The 2 decarburization molten iron that provided by the decarburization heat riser and the method for high-temperature liquid state pre-melted slag are that the hot metal pretreatment stove is weighed by the on-line weighing device before pack into blast furnace or melten iron in hot-metal mixer, the molten iron of packing into is skimmed earlier (after skimming, molten iron is not with slag substantially), and then weigh, the difference after weighing for twice is an iron water amount.Add slag charge (lime, rhombspar etc.) through metering in to the molten iron treating processes at the hot metal pretreatment stove, after the hot metal pretreatment stove finished the molten iron processing, the slag making material total amount of adding was the quantity of slag.
The said steel scrap of 3 present specification is people's steel products that can not re-use in the life of working.At steelworks is a kind of raw material of converter, electrosmelting.There are two portions in its source, and some is the outsourcing steel scrap, out of use steel product in the daily life, and as iron pan, bicycle frame etc., the iron and steel support of dismounting, steel pipeline, reinforcing bar, waste and old equipment, foundry goods etc.; Another part be steel mill in process of production, the waster that can not sell.Steel scrap is divided into ordinary scrap steel, special steel scrap by kind after returning steelworks, and ordinary scrap steel is meant that sulphur content below 0.050%, does not contain the steel scrap of special elements, and steel scrap is meant ordinary scrap steel here.
Claims (2)
1, a kind of earlier stage slag-smelting method for pre-smelting electric furnace, it comprises following sequential steps:
One makes the high-temperature liquid state pre-melted slag
1250～1400 ℃ blast-melted or melten iron in hot-metal mixer is added to the hot metal pretreatment stove, change the hot metal pretreatment stove over to molten steel decarburization intensification station, add lime and rhombspar by high hopper, it is the rhombspar that molten iron per ton adds 16kg～20kg lime and 3kg～4kg that first slag charge adds pan feeding, begin to carry out the decarburization hyperthermic treatment after the adding, add second batch of slag charge behind 9min～12min, molten iron per ton adds the rhombspar of 16kg～40kg lime and 3kg～6kg, add the 3rd batch of slag charge behind 13min～15min, molten iron per ton adds 16kg～40kg lime, continue blowing 10min～15min, thermometric sampling is when carbon content 1.5%～2.5%, 1530 ℃～1560 ℃ of temperature, offer electric furnace and use, the summation of three add-ons of slag making materials is to handle 6%～10% of weight of molten iron;
The charging of two electric furnaces:
Before the electric furnace charging is empty stove, and furnace bottom does not overlay the bedstone ash, adorns steel scrap earlier, and the steel scrap amount of adding is for adding 40%～50% of the total iron and steel stock of electric furnace; The decarburization molten iron and the high-temperature liquid state pre-melted slag of packing into then and being provided by the decarburization heat riser, high-temperature liquid state pre-melted slag are 6.7%～9% of the blast-melted or melten iron in hot-metal mixer weight of decarburization, convert and forbid slag to flow out from the electric furnace fire door in the iron process;
Three electrosmeltings:
The electric furnace hot metal charging begins to send electricity, oxygen blast to flux after finishing, and does not add the lime residue adjustment between melting period, does not also flow slag operation, and when liquid steel temperature reached 1560 ℃～1580 ℃, the steel scrap in the electric furnace all melted, sampling analysis, and begin to flow slag operation; If P in the molten steel 〉=0.025% enters oxidation period and begins to add lime and rhombspar slag making materials, molten steel per ton adds 10Kg～15Kg lime and 4Kg～6Kg rhombspar, if P in the molten steel≤0.025% is then no longer added lime and rhombspar slag making materials; In whole smelting process, keep foamy slag height 〉=500mm; Carbon in the molten steel, silicon and phosphorus require C:0.09～0.15%, Si≤0.10%, P≤0.015%, 1670 ℃～1700 ℃ electric furnace steel tappings of temperature below satisfying.
2, earlier stage slag-smelting method for pre-smelting electric furnace according to claim 1, it is characterized in that: at step 2 electric furnace when filling with substance, after adding decarburization molten iron and high-temperature liquid state pre-melted slag, be blended into untreated blast-meltedly again, the untreated blast-melted amount that is blended into is 30%～50% of a decarburization weight of molten iron.
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| CNB2008100547770A CN100564546C (en) | 2008-04-11 | 2008-04-11 | A kind of earlier stage slag-smelting method for pre-smelting electric furnace |
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| CNB2008100547770A CN100564546C (en) | 2008-04-11 | 2008-04-11 | A kind of earlier stage slag-smelting method for pre-smelting electric furnace |
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| CN101824508B (en) * | 2010-02-24 | 2011-09-21 | 南京钢铁股份有限公司 | Slagging method for electrosmelting |
| CN108950133A (en) * | 2018-08-16 | 2018-12-07 | 江苏久华环保科技股份有限公司 | A kind of full steel scrap electric arc furnace smelting slagging method |
| CN114959181B (en) * | 2022-05-31 | 2023-06-27 | 宝武集团鄂城钢铁有限公司 | Quick temperature rise refining method for deformed steel bar, deformed steel bar production method and deformed steel bar |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447265A (en) * | 1983-06-27 | 1984-05-08 | Schwer John W | Method and composition for foaming slag in electric arc furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4447265A (en) * | 1983-06-27 | 1984-05-08 | Schwer John W | Method and composition for foaming slag in electric arc furnace |
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