CN103725821B - A kind of method improved containing vanadium titanium semi-steel making converter lining life - Google Patents
A kind of method improved containing vanadium titanium semi-steel making converter lining life Download PDFInfo
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- CN103725821B CN103725821B CN201310612379.7A CN201310612379A CN103725821B CN 103725821 B CN103725821 B CN 103725821B CN 201310612379 A CN201310612379 A CN 201310612379A CN 103725821 B CN103725821 B CN 103725821B
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Abstract
A kind of method improved containing vanadium titanium semi-steel making converter lining life, described method comprises and loads in described converter by steel scrap, then half steel is poured into, add slag making materials, oxygen rifle is inserted in stove from furnace roof, is blown into oxygen, carry out the process of decarburization, phosphorus, sulphur, to obtain molten steel, oxygen supply intensity and the rifle position of described oxygen rifle are: when starting oxygen blast 60 seconds, oxygen supply intensity is 1.75-2m
3/ mint, rifle position is 1900-2200mm; When starting oxygen blast 60-90 second, oxygen supply intensity is 2.5-2.92m
3/ mint, rifle position is 1600-1900mm; After starting oxygen blast 90s, oxygen supply intensity is 3.42-3.75m
3/ mint, rifle position is 1400-1700mm.By the present invention, molten steel effectively can be avoided to corrode the problem such as venting of dust explosion, pipeline scale of furnace lining, converter dry dedusting, adopt the converter lining life of the method for the invention to be brought up to close to 6000 stoves by 1478 original stoves.
Description
Technical field
The present invention relates to a kind of method improved containing vanadium titanium semi-steel making converter lining life, more particularly, the present invention relates to a kind of method that can increase substantially containing vanadium titanium semi-steel making converter lining life.
Background technology
Half steel material carbon content is in 1.4 ~ 2.3% scopes, and mechanical property is between steel and iron, is generally used for manufacturing cast steel roll, is called semisteel roll, and it is little that it has hardness landing, wear resistance high.Vanadium, titanium mainly occur with the form of carbide, nitride and carbonitride in steel, these compounds at high temperature dissolve in austenite, play the effect suppressing Austenite Grain Growth when temperature reduces, have again part vanadium, titanium carbide to separate out simultaneously, play the effect of precipitation strength.
Due to the uniqueness of v-ti magnetite ore resources, the vanadium in blast-melted must first extract by steelworks, adopts the half steel after hot metal containing V-Ti vanadium extraction to be that raw material is made steel.Blast-melted (that is, half steel) after vanadium extraction, compared with ordinary blast molten iron, has the features such as temperature is low, carbon content is low, heat is low.But the half steel heat source insufficiency after process for extracting vanadium, 70-100 DEG C lower than common molten iron thermal source, causes the slag of converter terminal, molten steel oxidation strong, exacerbates high temperature, high oxidative furnace gas, slag, molten steel to the erosion of furnace lining, reduce furnace life.In addition, for realizing energy-saving and emission-reduction and the recycling economy of iron and steel enterprise, steel-making converter adopts DDS dry dedusting technology technology to instead of traditional wet dedusting and semidrying dedusting technology.This technology has converter and produces the advantages such as coal-gas recovering amount is many, dust content of gas is low, energy source and power consumption is low, maintenance workload is few.But its shortcoming is containing in vanadium titanium semi-steel making process, and the fault such as venting of dust explosion, pipeline scale, stifled ash very easily appears in electrostatic precipitator, will affect the continuity of producing time serious, causes converter interior alluvial molten steel, corrode furnace lining, reduction furnace life.
Summary of the invention
The object of the present invention is to provide a kind of method improved containing vanadium titanium semi-steel making converter lining life; molten steel can be effectively avoided to corrode the problem such as venting of dust explosion, pipeline scale of furnace lining, converter dry dedusting according to present method; thus better protecting is carried out to converter lining, improve converter lining life.
To achieve these goals, the present invention adopts following technical scheme:
According to a kind of method improved containing vanadium titanium semi-steel making converter lining life of the present invention, described method comprises and loads in described converter by steel scrap, then pour half steel into, add slag making materials, oxygen rifle is inserted in stove from furnace roof, be blown into oxygen, carry out the process of decarburization, phosphorus, sulphur, to obtain molten steel, it is characterized in that, regulate oxygen supply intensity and the rifle position of described oxygen rifle: when starting oxygen blast 60 seconds, oxygen supply intensity is 1.75-2m
3/ mint, rifle position is 1900-2200mm; When starting oxygen blast 60-90 second, oxygen supply intensity is 2.5-2.92m
3/ mint, rifle position is 1600-1900mm; After starting oxygen blast 90s, oxygen supply intensity is 3.42-3.75m
3/ mint, rifle position is 1400-1700mm.
According to an aspect of the present invention, described oxygen flow and rifle position adopt manual regulation control or automatically control according to automatic control module.
According to an aspect of the present invention, steel scrap weight is the 4wt%-6wt% of half steel weight, and thin material steel scrap weight is the 30wt-50wt% of steel scrap weight.
According to an aspect of the present invention, the weight of slag making materials is the 5wt%-7wt% of described Metal Weight.
According to an aspect of the present invention, described slag making materials consists of: quickened lime, high magnesium lime and containing SiO
2acid slag making materials, wherein, the weight of quickened lime is the 25wt%-32wt% of the gross weight of slag making materials, and the weight of high magnesium lime is the 40wt-60wt% of the gross weight of slag making materials, containing SiO
2the weight of acid slag making materials be the 25%-30% of the gross weight of slag making materials.
According to an aspect of the present invention, divided by described slag making materials and join for 8-15 time in molten iron, every batch of weight added is the 3wt%-35wt% of the gross weight of slag making materials.
According to an aspect of the present invention, for quickened lime, high magnesium lime and containing SiO
2acid slag making materials in each, first time the weight that adds be the 40wt%-50wt% of the gross weight of this kind of material.
According to an aspect of the present invention, at the 3-14 layer in the molten bath of described converter, between working lining and permanent layer, refractory brick is increased.
According to an aspect of the present invention, described refractory brick is magnesia carbon brick.
According to the present invention, can obtain but be not limited to following excellent effect:
(1) molten steel is effectively avoided to corrode the problem such as venting of dust explosion, pipeline scale of furnace lining, converter dry dedusting;
(2) converter lining life of the method for the invention is adopted to bring up to 6000 stoves by 1478 original stoves.
Embodiment
Below in conjunction with specific embodiment, a kind of method improved containing vanadium titanium semi-steel making converter lining life according to the present invention is described in detail.But they can be implemented in different forms, and should not be construed as the embodiment being confined to set forth here.On the contrary, provide these embodiments to make the disclosure to be thoroughly with complete, and the scope example embodiment is conveyed to those skilled in the art fully.
Hereinafter, will describe according to exemplary embodiment of the present invention.
According to one embodiment of present invention, provide a kind of method improved containing vanadium titanium semi-steel making converter lining life, comprise and steel scrap is loaded in stove, then pour molten iron into, add slag making materials, oxygen rifle is inserted in stove from furnace roof, be blown into oxygen, carry out the process of decarburization, phosphorus, sulphur, to obtain molten steel.Bessemerizing early stage, in order to avoid dry method dust venting of dust explosion, taking manual regulation to control or automatic control module regulates automatically, controlling oxygen supply intensity and oxygen rifle position: when starting oxygen blast 60 seconds, oxygen supply intensity is 1.75-2m
3/ mint, rifle position is 1900-2200mm; When starting oxygen blast 60-90 second, oxygen supply intensity is 2.5-2.92m
3/ mint, rifle position is 1600-1900mm; After starting oxygen blast 90s, oxygen supply intensity is 3.42-3.75m
3/ mint, rifle position is 1400-1700mm.Wherein, described automatic control module can realize according to oxygen flow and the design of rifle position the module that oxygen flow and rifle position control automatically.
Electrostatic precipitator venting of dust explosion condition in dry-dedusting system is CO%>9%, O
2>6% or H
2>3%, O
2>2%, therefore needs conservative control oxygen flow and rifle position.Rifle position is lower, and the impact kinetic energy of oxygen jet to molten bath is larger, and melting bath stirring is strengthened, and oxygen utilization rate is higher, accelerates desiliconization in stove, decarburizing reaction, and FeO content in slag is reduced; Decarbonization rate is fast, and shorten the reaction times, thermosteresis reduces relatively, and melt temperature is heated up rapidly.But rifle position is too low, be then unfavorable for slagging, also large impact may be caused to furnace bottom.And rifle position is too high, by making the stirring capacity in molten bath weaken, causing the oxidation of Surface Fe, FeO content in slag being increased, causes the serious foamed of slag and cause splash.Adopt oxygen flow of the present invention and rifle position control method, can effectively avoid molten steel to corrode the problem such as venting of dust explosion, pipeline scale of furnace lining, converter dry dedusting.
Owing to blowing, front oxygen flow is low, for impelling carrying out smoothly of smelting, need to the main raw material of converter smelting, and namely the add-on of half steel and steel scrap and addition sequence regulate.According to one embodiment of present invention, steel scrap weight is the 4wt%-6wt% of half steel weight, and thin material steel scrap weight is the 30wt-50wt% of steel scrap weight.Wherein, thin material steel scrap refers to the steel scrap that Thickness Ratio ordinary scrap steel is thin, adopts thin material steel scrap that reaction can be made to be easier to carry out.
In smelting process, if C-O reaction is unbalanced in molten bath, the CO gas that instantaneous generation is a large amount of, then can promote molten steel of melting bath motion, outside molten steel, slag band plug for outlet, cause splash.If molten bath cools suddenly, temperature declines, and inhibit the C-O reaction carried out rapidly, the oxygen of infeed generates a large amount of FeO, and starts to gather.Once molten bath is elevated to a certain degree, when TFe accumulates to more than 20%, C-O reaction is carried out with more fierce speed again, a large amount of CO gas of instantaneous discharge, and takes molten steel and slag out of, causes splash.If bath temperature is too high, cause slag high-melting-point 2CaOSiO
2, the mineral such as MgO precipitation, then slag viscosity can be caused to increase, and can not covering metal liquid level, occur the phenomenon that slag " returns dry ".Therefore, need in smelting process, control bath temperature well, avoid steep temperature rise or cooling, so need add in batches refrigerant and slag making materials.
According to one embodiment of present invention, the weight of slag making materials is the 5wt%-7wt% of Metal Weight.Slag making materials consists of: quickened lime, high magnesium lime and containing SiO
2acid slag making materials, wherein, the weight of quickened lime is the 25wt%-32wt% of the gross weight of slag making materials, and the weight of high magnesium lime is the 40wt-60wt% of the gross weight of slag making materials, containing SiO
2the weight of acid slag making materials be the 25%-30% of slag making materials gross weight.Divided by described slag making materials and join for 8-15 time in molten iron, every batch of weight added is the 3wt%-35wt% of slag making materials gross weight.For quickened lime, high magnesium lime and containing SiO
2acid slag making materials in each, first time the weight that adds be the 40wt%-50wt% of the gross weight of this kind of material.
Wherein, the high magnesium lime in described slag making materials, except playing fluxing effect, also can be used as refrigerant, plays cooling down effect.Particularly, when molten steel temperature is higher than specified temperature, namely during 1650-1680 DEG C, then add refrigerant, reduce molten steel temperature.If C-O reacts the heat source insufficiency provided, then external source is adopted to supplement.By the control to slag material and refrigerant first time add-on, sharply raising or reduce the splash that causes or return dry by temperature can be avoided, and because high temperature, high oxidative furnace gas, slag, molten steel are to the erosion of furnace lining.
In addition, the too high meeting of temperature that evaporative cooler (EC) exports causes warning, causes producing interrupting.Therefore, the thermopair sensitivity of measuring converter high-temperature flue gas is adjusted, reduces its sensitivity, decrease high temperature alarm number of times.After adjustment, extremely carrying rifle number of times in converting process less, reducing the oxidisability of converter terminal slag, because this reducing the erosion to converter magnesia carbon brick.
In addition, before converter terminal tapping, add such as containing MgO, SiO
2the material of adjustment Performance of Slag, viscosity, temperature, the oxygen activity of adjustment slag, and after tapping, by again adding such as containing MgO, SiO
2residue adjustment material, adjustment cinder viscosity, making it when shaking converter, can evenly, stably be bonded on furnace wall, realize the protection of slag to converter magnesia carbon brick, thus reaches and improve the object in furnace life.
According to another embodiment of the invention, the design of the steel-making converter type of furnace adopts ball-type furnace bottom, and it compares with straight tube ball-type furnace bottom, and after the converter of ball-type furnace bottom is deepened, pool depth increases, and dephosphorization rate improves.But after furnace bottom declines, bath surface height declines, cause slag interface place to corrode and worsen, therefore, weak part between the 3-14 layer of molten bath, increases refractory brick between working lining and permanent layer.Described refractory brick can be anti-corrosion magnesia carbon brick, and size can be width × highly=150mm × 150mm.By increasing refractory brick at weak part, the erosion of molten steel to weak part significantly can be reduced.
The present invention can be applicable to the furnace life of raising 200 tons containing the converter of vanadium titanium semi-steel making, but the present invention is not limited thereto, and can also be other tonnage conventional in this area containing the converter of vanadium titanium semi-steel making.The converter lining life of the method for the invention is adopted to bring up to 6000 stoves by 1478 original stoves.
Example 1
Prepare following material:
Half steel: 220t; Steel scrap: 10t, wherein, frivolous steel scrap accounts for 30% of steel scrap; Slag making materials: 12.5t, wherein, quickened lime 4t, high magnesium lime 5t, containing SiO
2acid slag making materials 3.5t.
Before starting oxygen blast during 6min, 10t steel scrap (wherein, frivolous steel scrap is 3t) is joined in converter, before starting oxygen blast during 3min, pour 220t half steel into.Use oxygen rifle to carry out oxygen-supply operation to molten steel, oxygen-supply operation starting point is time zero: when starting oxygen blast 60 seconds, oxygen supply intensity is 1.83m
3/ mint, rifle position is 2000mm; When starting oxygen blast 60-90 second, oxygen supply intensity is 2.58m
3/ mint, rifle position is 1700mm; After starting oxygen blast 90s, oxygen supply intensity is 3.5m
3/ mint, rifle position is 1500mm.Wherein, quickened lime, high magnesium lime and containing SiO
2the feed time of acid slag making materials and reinforced consumption as shown in table 1.
The feed time of table 1 slag making materials and reinforced consumption
Wherein, the time shown in table 1 with oxygen-supply operation starting point for time zero.After having gone out steel, add the residue adjustment material containing MgO, cinder viscosity is adjusted, make its even, stable being bonded on furnace wall.
Example 2
Prepare following material:
Half steel: 220t; Steel scrap: 13t, wherein, frivolous steel scrap accounts for 45% of steel scrap; Slag making materials: 13t, wherein, quickened lime 3.5t, high magnesium lime 6t, containing SiO
2acid slag making materials 3.5t.
Before starting oxygen blast during 6min, 6t steel scrap (wherein, frivolous steel scrap is 2.4t) is joined in converter, before starting oxygen blast during 3min, pour 200t half steel into.Use oxygen rifle to carry out oxygen-supply operation to molten steel, oxygen-supply operation starting point is time zero: when starting oxygen blast 60 seconds, oxygen supply intensity is 1.92m
3/ mint, rifle position is 2100mm; When starting oxygen blast 60-90 second, oxygen supply intensity is 2.83m
3/ mint, rifle position is 1800mm; After starting oxygen blast 90s, oxygen supply intensity is 3.67m
3/ mint, rifle position is 1600mm.Wherein, quickened lime, high magnesium lime and containing SiO
2the feed time of acid slag making materials and reinforced consumption as shown in table 1.
The feed time of table 2 slag making materials and reinforced consumption
Wherein, the time shown in table 2 with oxygen-supply operation starting point for time zero.After having gone out steel, add containing SiO
2residue adjustment material, cinder viscosity is adjusted, makes its even, stable being bonded on furnace wall.
According to the converter steel making method that the present embodiment provides, molten steel effectively can be avoided to corrode the problem such as venting of dust explosion, pipeline scale of furnace lining, converter dry dedusting, adopt the converter lining life of the method for the invention to be brought up to close to 6000 stoves by 1478 original stoves.
Although show and describe some embodiments of the present invention, it should be appreciated by those skilled in the art that when not departing from by the principle of the present invention of claim and its scope of equivalents thereof and spirit, can modify to these embodiments.
Claims (9)
1. one kind is improved the method containing vanadium titanium semi-steel making converter lining life, described method comprises and loads in described converter by steel scrap, then half steel is poured into, add slag making materials, oxygen rifle is inserted in stove from furnace roof, is blown into oxygen, carry out the process of decarburization, phosphorus, sulphur, to obtain molten steel, it is characterized in that, regulate oxygen supply intensity and the rifle position of described oxygen rifle:
When starting oxygen blast 60 seconds, oxygen supply intensity is 1.75-2m
3/ mint, rifle position is 1900-2200mm;
Start oxygen blast after 60 seconds to 90 seconds time, oxygen supply intensity is 2.5-2.92m
3/ mint, rifle position is 1600-1900mm;
After starting oxygen blast 90s, oxygen supply intensity is 3.42-3.75m
3/ mint, rifle position is 1400-1700mm.
2. method according to claim 1, is characterized in that, described oxygen flow and rifle position adopt manual regulation control or automatically control according to automatic control module.
3. method according to claim 1, is characterized in that, steel scrap weight is the 4wt%-6wt% of half steel weight, and thin material steel scrap weight is the 30wt-50wt% of steel scrap weight.
4. method according to claim 1, is characterized in that, the weight of slag making materials is the 5wt%-7wt% of described Metal Weight.
5. method according to claim 4, is characterized in that, described slag making materials consists of: quickened lime, high magnesium lime and containing SiO
2acid slag making materials, wherein, the weight of quickened lime is the 25wt%-32wt% of the gross weight of slag making materials, and the weight of high magnesium lime is the 40wt-60wt% of the gross weight of slag making materials, containing SiO
2the weight of acid slag making materials be the 25wt%-30wt% of the gross weight of slag making materials, described quickened lime, high magnesium lime and containing SiO
2the weight percent sum of acid slag making materials be 100%.
6. method according to claim 4, is characterized in that, is divided by described slag making materials and joins for 8-15 time in molten iron, and every batch of weight added is the 3wt%-35wt% of the gross weight of slag making materials.
7. method according to claim 5, is characterized in that, for quickened lime, high magnesium lime and containing SiO
2acid slag making materials in each, first time the weight that adds be the 40wt%-50wt% of the gross weight of this kind of material.
8. method according to claim 1, is characterized in that, at the 3-14 layer in the molten bath of described converter, between working lining and permanent layer, increases refractory brick.
9. method according to claim 8, is characterized in that, described refractory brick is magnesia carbon brick.
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| CN104032064B (en) * | 2014-06-25 | 2016-02-03 | 攀钢集团西昌钢钒有限公司 | A kind of method for making steel |
| CN104313235B (en) * | 2014-10-30 | 2016-04-27 | 攀钢集团西昌钢钒有限公司 | Prevent semi-steel making converter dry dust-removal system from opening the method for blowing venting of dust explosion |
| CN108998619A (en) * | 2018-08-21 | 2018-12-14 | 成渝钒钛科技有限公司 | A method of reducing the converter smelting period |
| CN115679034B (en) * | 2022-09-09 | 2024-02-02 | 天津喆丰环保科技有限公司 | Oxygen blowing control method of electric arc furnace based on molten steel liquid level position |
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| CN102220453A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Dephosphorization method of semi-steel |
| CN103320566A (en) * | 2013-06-26 | 2013-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting semi-steel through double-slag process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102220453A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Dephosphorization method of semi-steel |
| CN103320566A (en) * | 2013-06-26 | 2013-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting semi-steel through double-slag process |
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