CN104212943A - Semisteel smelting technology - Google Patents
Semisteel smelting technology Download PDFInfo
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- CN104212943A CN104212943A CN201410510804.6A CN201410510804A CN104212943A CN 104212943 A CN104212943 A CN 104212943A CN 201410510804 A CN201410510804 A CN 201410510804A CN 104212943 A CN104212943 A CN 104212943A
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Abstract
The invention provides a semisteel smelting technology which comprises the following steps: supplying oxygen with an oxygen lance, and blowing semisteel and composite slag charge to obtain molten steel, wherein the composite slag charge comprises lime, soft burned dolomite and a dephosphorizing and slagging agent; the dephosphorizing and slagging agent comprises the following components in percentage by mass: 25-45 percent of CaO, 12-30 percent of MgO, 8-25 percent of FeO and 8-25 percent of SiO2. In the semisteel smelting technology provided by the invention, the novel dephosphorizing and slagging agent is used and forms a substance for making up an acid slag system in semisteel smelting, so that the semisteel smelting technology provided by the invention achieves a better dephosphorizing effect and a better slagging effect.
Description
Technical field
The invention belongs to field of smelting, particularly relate to a kind of semisteel smelting technique.
Background technology
China's v-ti magnetite mineral deposit is widely distributed, rich reserves, reserves and produced quantity occupy the 3rd of national iron ore, and vanadium titano-magnetite is not only the important sources of iron, and the Multicomponent such as the vanadium of association, titanium, chromium, cobalt, nickel, platinum family and scandium, there is very high comprehensive utilization value.
Being the smelting technology of raw material at present with vanadium titano-magnetite: by the vanadium-titanium-iron-water of blast-furnace smelting----hot metal pretreatment (desulfurization) → vanadium extraction → semisteel smelting → terminal point control → slag-stopping tapping → deoxidation of molten steel alloying → furnace rear refining → continuous casting obtains finished product steel billet.Because the vanadium in vanadium titano-magnetite can improve the intensity of steel, hardness and wear resistance, it is important strategic resource.First vanadium titanium magnetic mining and metallurgy is smelt vanadium-titanium-iron-water, in vanadium-titanium-iron-water, utilizes the principle of selective oxidation, vanadium is oxidized to the stable barium oxide of high price and produces vanadium slag, realize the extraction of vanadium in vanadium titano-magnetite.
Vanadium-bearing hot metal in vanadium extraction operation after vanadium is removed in oxidation, the only heating element such as silicon, manganese of remaining trace, slag SiO in smelting process
2, TiO
2little Deng acidic oxide content, cause slag components single, basicity is high, and viscosity is large, poor fluidity.So its metallurgical performance is not high, and dephosphorizing capacity is low, blows and slough phosphorus, thus cause the quantity of slag to increase after often will relying on, slag charge consumes high, and steel technology rises, and limits the raising in furnace life and the shortening of smelting cycle.Therefore, since exploitation smelting vanadium-titanium magnetite by blast furnace, there is a difficult problem in vanadium extraction by converter blowing steel-making, and the half steel namely after vanadium extraction is initial stage slagging difficulty in steelmaking process, and impact removes phosphorus.
In prior art, semisteel smelting process blows with oxygen supply by lance, add lime 1000-1500Kg at furnace bottom, light dolomite 1000Kg before blowing, during blowing beginning, add lime 1000Kg (comprise furnace bottom add that lime amounts to lime total amount 70%), light dolomite 500Kg, dissolving agent 800-1000Kg (adding total amount), adds remaining slag charge, when carbon content reaches in claimed range in half steel after blowing starts in 240 ~ 270s, oxygen feeding stop, taps.Existing semisteel smelting technique is at the end of smelting, and in half steel, the qualification rate of content≤0.030% of phosphorus only has 48.80%, and dephosphorization effect is poor.
Summary of the invention
The object of the present invention is to provide a kind of semisteel smelting technique, semisteel smelting technique provided by the invention has good dephosphorization effect.
The invention provides a kind of semisteel smelting technique, comprise the following steps:
With oxygen supply by lance, half steel and compound slag charge are blown, obtains molten steel;
Described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent;
Described dephosphorization dissolving agent comprises the component of following massfraction:
CaO：25～45％；
MgO：12～30％；
FeO：8～25％；
SiO
2：8～25％。
Preferably, in described compound slag charge, the mass ratio of lime, light dolomite and dephosphorization dissolving agent is 1:(0.25 ~ 0.5): (0.2 ~ 0.4).
Preferably, add gauge with the converter that capacity is 80 tons, the consumption of described compound slag charge is 4000 ~ 6000Kg/ stove.
Preferably, described compound slag charge divides three times and adds, and before described blowing starts, first time adds compound slag charge, and the amount that described first time adds compound slag charge is: 35 ~ 45% of lime total amount and 75 ~ 85% of light dolomite total amount;
When described blowing starts, second time adds compound slag charge, and the amount that described second time adds compound slag charge is: all dephosphorization dissolving agent and lime total amount 35 ~ 45%;
After described blowing starts, in 180 ~ 250s, third time adds compound slag charge, and the amount that described third time adds compound slag charge is: remaining lime and remaining light dolomite.
Preferably, the method that adds compound slag charge is specially described third time:
After described blowing starts in 180 ~ 250s, described remaining lime and remaining light dolomite are added at twice.
Preferably, when described blowing starts, the shower nozzle bottom end face distance half steel liquid level of oxygen rifle is 1500 ~ 1600mm.
Preferably, during described finishing blowing, the shower nozzle bottom end face distance half steel liquid level of oxygen rifle is 1250 ~ 1350mm.
Preferably, in 0 ~ 200s of oxygen supply, oxygen pressure is 0.7 ~ 0.75MPa;
In oxygen supply 200 ~ 500s, oxygen pressure is 0.75 ~ 0.8MPa;
Oxygen supply 500s is to smelting end, and oxygen pressure is 0.75 ~ 0.85MPa.
Preferably, in described semisteel smelting, also comprise and use half steel insulating covering agent, described half steel insulating covering agent comprises the SiC that massfraction is 30%.
Preferably, in described semisteel smelting, also comprise use graphite pebbles.
The invention provides a kind of semisteel smelting technique, comprise the following steps: with oxygen supply by lance, half steel and compound slag charge are blown, obtains molten steel; Described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent; Described dephosphorization dissolving agent comprises the component of following massfraction: CaO:20 ~ 40%; MgO:12 ~ 20%; FeO:8 ~ 20%; SiO
2: 8 ~ 20%.Employ novel dephosphorization dissolving agent in semisteel smelting technique provided by the invention, a kind of material making up the acid slag system of semisteel smelting can be formed, serve the effect of dephosphorization slag fast, improve the dephosphorization effect of semisteel smelting.Experimental data shows, uses semisteel smelting technique provided by the invention to carry out semisteel smelting, and smelt after terminating, in molten steel, the qualification rate of content≤0.03% of phosphorus is 65%, and dephosphorization effect is better.
Embodiment
The invention provides a kind of semisteel smelting technique, comprise the following steps: with oxygen supply by lance, half steel and compound slag charge are blown, obtains molten steel; Described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent; Described dephosphorization dissolving agent comprises the component of following massfraction: CaO:25 ~ 45%; MgO:12 ~ 30%; FeO:8 ~ 25%; SiO
2: 8 ~ 25%.
Semisteel smelting technique provided by the invention has good dephosphorization effect, improves the qualification rate of phosphorus content≤0.03% in molten steel.
Semisteel smelting technique provided by the invention comprises the following steps: with oxygen supply by lance, half steel and compound slag charge is blown, obtains molten steel.The present invention does not have special restriction to the source of described half steel and consumption, uses half steel well known to those skilled in the art.The present invention preferably adopts converter to carry out described semisteel smelting, and the capacity of the present invention to described converter does not have special restriction, concrete, in an embodiment of the present invention, capacity can be adopted to be the converter of 80 tons.
In the present invention, described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent.The source of the present invention to described lime and light dolomite does not have special restriction, can adopt the commercial goods of described lime and light dolomite, can prepare voluntarily according to the technical scheme of the described lime of preparation well known to those skilled in the art and light dolomite yet.
Dephosphorization dissolving agent provided by the invention comprises CaO (calcium oxide), described calcium oxide can reduce with described dephosphorization dissolving agent with the use of the consumption of light dolomite, thus reduce total quantity of slag.In the present invention, the massfraction of described calcium oxide is 25 ~ 45%, is preferably 30 ~ 40%, is more preferably 32 ~ 38%.The form of the present invention to described calcium oxide does not have special restriction, and the present invention preferably adopts lime powder.Ore containing calcium oxide is preferably pulverized by the present invention, obtains lime powder.The kind of the present invention to the described ore containing calcium oxide does not have special restriction, adopts the ore containing calcium oxide well known to those skilled in the art.In the present invention, the described ore containing calcium oxide is preferably lime, is more preferably the lime that CaO massfraction is 85%.The granularity of the present invention to described lime powder does not have special restriction, carries out pulverizing according to practical situation.
Dephosphorization dissolving agent provided by the invention comprises MgO (magnesium oxide), described magnesium oxide can reduce with described dephosphorization dissolving agent with the use of the consumption of light dolomite, thus reduce total quantity of slag.In the present invention, described magnesian massfraction is 12 ~ 30%, is preferably 15 ~ 25%, is more preferably 16 ~ 20%.The present invention does not have special restriction to described magnesian form, and the present invention preferably adopts magnesium oxide powder.The present invention preferably will pulverize containing magnesian ore, obtain magnesium oxide powder.The present invention does not have special restriction to the described kind containing magnesian ore, adopts well known to those skilled in the art containing magnesian ore.In the present invention, be describedly preferably light-burning magnesium powder containing magnesian ore, be more preferably QM-75 type light-burning magnesium powder.The granularity of the present invention to described magnesium oxide powder does not have special restriction, carries out pulverizing according to practical situation.
Dephosphorization dissolving agent provided by the invention comprises FeO (iron protoxide), and described iron protoxide can increase the change slag ability of described dephosphorization dissolving agent, reduces the oxidation of molten pool metal iron.In the present invention, the massfraction of described iron protoxide is preferably 8 ~ 25%, is more preferably 10 ~ 20%, most preferably is 12 ~ 16%.The form of the present invention to described iron protoxide does not have special restriction, and the present invention preferably adopts iron protoxide powder.Ore containing iron protoxide is preferably pulverized by the present invention, obtains iron protoxide powder.The kind of the present invention to the described ore containing iron protoxide does not have special restriction, adopts the ore containing iron protoxide well known to those skilled in the art.In the present invention, the described ore containing iron protoxide is preferably iron ore.The granularity of the present invention to described iron protoxide powder does not have special restriction, carries out pulverizing according to practical situation.
Dephosphorization dissolving agent provided by the invention comprises SiO
2(silicon-dioxide), in the present invention, the massfraction of described silicon-dioxide is preferably 8 ~ 25%, is more preferably 10 ~ 20%, most preferably is 12 ~ 16%.The form of the present invention to described silicon-dioxide does not have special restriction, and the present invention preferably adopts SiO 2 powder.Ore containing silicon-dioxide is preferably pulverized by the present invention, obtains SiO 2 powder.The kind of the present invention to the described ore containing silicon-dioxide does not have special restriction, adopts the ore containing silicon-dioxide well known to those skilled in the art.In the present invention, the described ore containing silicon-dioxide is preferably wilkinite.The granularity of the present invention to described SiO 2 powder does not have special restriction, carries out pulverizing according to practical situation.
Dephosphorization dissolving agent provided by the invention also comprises sulphur, and in the present invention, the massfraction of described sulphur preferably≤0.065%, to be more preferably≤0.05%, most preferably be≤0.03%.
In the present invention, the preparation method of described dephosphorization dissolving agent preferably includes following steps: mixed by the SiO of the CaO of massfraction 25 ~ 45%, the MgO of 12 ~ 30%, the FeO of 8 ~ 25% and 8 ~ 25%, obtain dephosphorization dissolving agent.The present invention preferably by the lime powder of 30 ~ 50%, 15 ~ 40% light-burning magnesium powder, 14 ~ 35% iron ore powder, 15 ~ 35% bentonite clay particle mixing, obtain dephosphorization dissolving agent.The method of the present invention to described mixing does not have special restriction, adopts conventional hybrid technology scheme.
In the present invention, the massfraction of described lime powder is preferably 30 ~ 50%, is more preferably 35 ~ 45%, most preferably is 38 ~ 42%.The source of the present invention to described lime powder does not have special restriction, can adopt the commercial goods of described lime powder, can prepare voluntarily according to the technical scheme preparing lime powder well known to those skilled in the art yet.The present invention preferably adopt CaO content be 85% lime powder.Lime is preferably pulverized by the present invention, obtains lime powder.The method of the present invention to described pulverizing does not have special restriction, adopts the technical scheme of pulverizing well known to those skilled in the art.
In the present invention, the massfraction of described magnesia is preferably 15 ~ 40%, is more preferably 20 ~ 35%, most preferably is 25 ~ 30%.The source of the present invention to described light-burning magnesium powder does not have special restriction, can adopt the commercial goods of described light-burning magnesium powder, can prepare voluntarily according to the technical scheme preparing light-burning magnesium powder well known to those skilled in the art yet.Concrete, in an embodiment of the present invention, QM-75 type light-burning magnesium powder can be adopted.
In the present invention, the massfraction of described iron ore powder is preferably 14 ~ 35%, is more preferably 15 ~ 30%, most preferably is 20 ~ 25%.The source of the present invention to described iron ore powder does not have special restriction, and iron ore is preferably pulverized by the present invention, obtains iron ore powder.The method of the present invention to described pulverizing does not have special restriction, adopts the technical scheme of pulverizing well known to those skilled in the art.
In the present invention, described bentonitic massfraction is preferably 15 ~ 35%, is more preferably 20 ~ 30%, most preferably is 23 ~ 28%.The present invention does not have special restriction to described bentonitic source, adopts described bentonitic commercial goods.
For improving the dephosphorization of described dephosphorization dissolving agent and changing the efficiency of slag, after completing described mixing, the powder be mixed to get preferably is carried out pressure ball by the present invention, obtains dephosphorization dissolving agent.The method and apparatus of the present invention to described pressure ball does not have special restriction, adopts technical scheme and the equipment of pressure ball well known to those skilled in the art.
After completing described pressure ball, the dephosphorization dissolving agent that pressure ball preferably obtains by the present invention is dried, and obtains dephosphorization dissolving agent.In the present invention, the temperature of described oven dry is preferably 80 ~ 120 DEG C, is more preferably 85 ~ 110 DEG C, most preferably is 90 ~ 100 DEG C, and the time of described oven dry is preferably 7 ~ 8 hours, is more preferably 7.2 ~ 7.8 hours.
In the present invention, in described compound slag charge, the mass ratio of lime, light dolomite and dephosphorization dissolving agent is preferably 1:(0.25 ~ 0.5): (0.2 ~ 0.4), be more preferably 1:(0.30 ~ 0.4): (0.25 ~ 0.35), most preferably is 1:0.35:0.30; With capacity be the converter of 80 tons add gauge, the consumption of described compound slag charge in semisteel smelting is preferably 4000 ~ 6000kg/ stove, be more preferably 4500 ~ 5500kg/ stove, most preferably be 5000kg/ stove, the capacity of described converter is consistent with the capacity of converter in technique scheme, does not repeat them here.
Described compound slag charge preferably divides three times and adds by the present invention, respectively before described blowing starts, blowing start time and converting process in add.Before described blowing starts, the present invention preferably adds 35 ~ 45% of lime total amount and 75 ~ 85% of light dolomite total amount, more preferably add 38 ~ 42% of lime total amount and 78 ~ 82% of light dolomite, most preferably add 40% of lime total amount and 80% of light dolomite; When described blowing starts, the present invention preferably adds 35 ~ 45% of whole dephosphorization dissolving agent and lime total amount, more preferably adds 38 ~ 42% of whole dephosphorization dissolving agent and lime total amount, most preferably adds 40% of whole dephosphorization dissolving agent and lime total amount; In converting process, in the 180 ~ 250s of the present invention preferably after blowing starts, add remaining lime and remaining light dolomite, more preferably described remaining lime and remaining light dolomite are added at twice.The present invention adds described residue lime to described twice does not have special restriction with the amount and time remaining light dolomite, in 180 ~ 250s after blowing starts, described remaining lime and remaining light dolomite is added.
In the present invention, in 500 ~ 600s after blowing starts, if the slag gone out from fire door splash is in solid-state, then the present invention preferably adds ore pellets adjustment, and the iron content more than 50% that described ore pellets is preferably become by iron ore powder sintering sinters iron ore.
The present invention is with oxygen supply by lance in described converting process, and the kind of the present invention to described oxygen rifle does not have special restriction, adopts oxygen rifle well known to those skilled in the art.In the present invention, when described blowing starts, described oxygen rifle shower nozzle bottom end face distance half steel liquid level be preferably 1500 ~ 1600mm, be more preferably 1520 ~ 1580mm, most preferably be 1530 ~ 1560mm; When described finishing blowing, described oxygen rifle shower nozzle bottom end face distance half steel liquid level be preferably 1250 ~ 1350mm, be more preferably 1260 ~ 1330mm, most preferably be 1280 ~ 1300.In the present invention, the shower nozzle bottom end face distance half steel liquid level of described oxygen rifle be the time of 1250 ~ 1350mm preferably >=100s.In the present invention, described blowing starts namely to start oxygen supply, and in 0 ~ 200s of oxygen supply, the oxygen pressure of described oxygen supply is preferably 0.7 ~ 0.75MPa, is more preferably 0.72 ~ 0.74MPa; In oxygen supply 200 ~ 500s, the oxygen pressure of described oxygen supply is preferably 0.75 ~ 0.8MPa, is more preferably 0.76 ~ 0.78MPa; At oxygen supply 500s to smelting end, the oxygen pressure of described oxygen supply is preferably 0.75 ~ 0.85MPa, is more preferably 0.78 ~ 0.83MPa.
The present invention preferably adds half steel insulating covering agent in half steel, and described half steel insulating covering agent is preferably SiC, and being more preferably containing massfraction is the material of 30%SiC, and described SiC can not only increase a certain amount of smelting slag system middle acid substance SiO
2, SiC can also oxidation heat liberation in semisteel smelting, makes up semisteel smelting heat.The present invention does not have special restriction to the source of described half steel insulating covering agent and consumption, can play the effect of described half steel insulating covering agent.
In order to make up molten bath heat, guarantee that the temperature of the molten steel of tapping and carbon content reach requirement, the present invention preferably adds graphite pebbles in half steel, and the present invention does not have special restriction to the source of described graphite pebbles and consumption, can play the effect of described graphite pebbles.If the temperature of molten steel or carbon content do not reach requirement during tapping, can re-blow, described in time of re-blowing be preferably 60 ~ 120s, be more preferably 70 ~ 100s.
The present invention adopts above-mentioned semisteel smelting technique to carry out semisteel smelting, gauge is added with the converter that capacity is 80 tons, the consumption of described dephosphorization dissolving agent is preferably 700 ~ 900kg/ stove, be more preferably 750 ~ 850kg/ stove, most preferably be 800kg/ stove, the capacity of described converter is consistent with the capacity of converter in technique scheme, does not repeat them here.After using dephosphorization dissolving agent provided by the invention to carry out semisteel smelting, the half steel dissolving agent used compared to existing technology, total slag charge consumption reduces 8kg/ ton, total slag charge cost reduces by 3.3 yuan/ton, steel technology decreases 2kg/ ton, iron and steel stock cost reduces 8.7 yuan/ton, the reduction of comprehensive above-mentioned total slag charge cost and iron and steel stock cost, use dephosphorization dissolving agent provided by the invention total cost can be reduced by 12 yuan/ton, calculate to produce 2000000 tons of steel per year, total cost 2,400 ten thousand yuan can be reduced every year, reduce outer bed drain purge 16000 tons, bring very large economic benefit.
The invention provides a kind of semisteel smelting technique, comprise the following steps: with oxygen supply by lance, half steel and compound slag charge are blown, obtains molten steel; Described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent; Described dephosphorization dissolving agent comprises the component of following massfraction: CaO:25 ~ 45%; MgO:12 ~ 30%; FeO:8 ~ 25%; SiO
2: 8 ~ 25%.Employ novel dephosphorization dissolving agent in semisteel smelting technique provided by the invention, and compound slag charge is divided the compound slag charge adding for three times and add specified quantitative at every turn, make semisteel smelting technique provided by the invention reach good dephosphorization effect and change slag effect.
In order to further illustrate the present invention, below in conjunction with embodiment, a kind of semisteel smelting technique provided by the invention being described in detail, but can not limiting the scope of the present invention being understood as.
In the examples below, half steel, lime and light dolomite that half steel, lime and light dolomite adopt Desheng, Sichuan Fan Tai company limited to produce, the amount that described lime, light dolomite and dephosphorization dissolving agent add all calculates with the add-on of every converter, and converter employing capacity is the converter of 80 tons.
Embodiment 1
Mixing after 37Kg lime, 20Kg light-burning magnesium powder, 17Kg iron ore and 32Kg wilkinite being pulverized, obtains dephosphorization dissolving agent mixed powder;
By after the dephosphorization dissolving agent mixed powder pressure ball that obtains, at 100 DEG C, dry 480min.Obtain dephosphorization dissolving agent.In the dephosphorization dissolving agent obtained containing the calcium oxide of massfraction 31.71%, the magnesium oxide of 14.68%, the iron protoxide of 9.56% and 15.56% silicon-dioxide.
Embodiment 2
Half steel is added in converter, add the lime of 1000Kg and the light dolomite of 800Kg at converter bottom;
Then oxygen rifle is placed in the position of 1550mm, start oxygen supply, oxygen pressure is 0.75MPa, starts blowing, adds the dephosphorization dissolving agent that the lime of 1000Kg and the 734Kg embodiment of the present invention 1 obtain simultaneously;
When blowing starts 180s, add the lime of 400Kg and the light dolomite of 100Kg; When blowing starts 200s, add the lime of 510Kg and the light dolomite of 112Kg, oxygen pressure is adjusted to 0.8MPa simultaneously, continue blowing;
Oxygen pressure is adjusted to 0.85MPa, until fire door flame is faint, oxygen rifle is down to 1250mm after starting 500s by blowing, and oxygen feeding stop blows, and is poured out by molten steel.
The present invention carries out semisteel smelting 50 times according to technique scheme, smelts after terminating, carries out chemical analysis to converter molten steel, and the win bit rate of phosphorus content≤0.03% in statistics molten steel, result shows that the qualification rate of phosphorus content≤0.03% in molten steel is 65%.
Embodiment 3
Half steel is added in converter, add the lime of 1000Kg and the light dolomite of 800Kg at converter bottom;
Then oxygen rifle is placed in the position of 1500mm, start oxygen supply, oxygen pressure is 0.7MPa, starts blowing, adds the dephosphorization dissolving agent that the lime of 1000Kg and the 765Kg embodiment of the present invention 1 obtain simultaneously;
When blowing starts 200s, add the lime of 450Kg and the light dolomite of 80Kg, oxygen pressure is adjusted to 0.8MPa simultaneously; When blowing starts 250s, add the lime of 527Kg and the light dolomite of 109Kg, continue blowing;
Oxygen pressure is adjusted to 0.75MPa, until fire door flame is faint, oxygen rifle is down to 1350mm after starting 500s by blowing, and oxygen feeding stop blows, and is poured out by molten steel.
The present invention carries out semisteel smelting 50 times according to technique scheme, smelts after terminating, carries out chemical analysis to converter molten steel, and the win bit rate of phosphorus content≤0.03% in statistics molten steel, result shows that the qualification rate of phosphorus content≤0.03% in molten steel is 65%.
Embodiment 4
Half steel is added in converter, add the lime of 1000Kg and the light dolomite of 800Kg at converter bottom;
Then oxygen rifle is placed in the position of 1600mm, start oxygen supply, oxygen pressure is 0.7MPa, starts blowing, adds the dephosphorization dissolving agent that the lime of 1000Kg and the 800Kg embodiment of the present invention 1 obtain simultaneously;
When blowing starts 200s, add the lime of 127Kg and the light dolomite of 100Kg, oxygen pressure is adjusted to 0.8MPa simultaneously; When blowing starts 250s, add the lime of 100Kg and the light dolomite of 199Kg, continue blowing;
Oxygen pressure is adjusted to 0.75MPa, until fire door flame is faint, oxygen rifle is down to 1300mm after starting 500s by blowing, and oxygen feeding stop blows, and is poured out by molten steel.
The present invention carries out semisteel smelting 50 times according to technique scheme, smelts after terminating, carries out chemical analysis to converter molten steel, and the win bit rate of phosphorus content≤0.03% in statistics molten steel, result shows that the qualification rate of phosphorus content≤0.03% in molten steel is 65%.
Embodiment 5
Half steel is added in converter, add the lime of 1000Kg and the light dolomite of 800Kg at converter bottom;
Then oxygen rifle is placed in the position of 1550mm, start oxygen supply, oxygen pressure is 0.75MPa, starts blowing, adds the dephosphorization dissolving agent that the lime of 1000Kg and the 833Kg embodiment of the present invention 1 obtain simultaneously;
When blowing starts 200s, add the lime of 866Kg and the light dolomite of 217Kg; Oxygen pressure is adjusted to 0.8MPa simultaneously, continues blowing;
Oxygen pressure is adjusted to 0.85MPa, until fire door flame is faint, oxygen rifle is down to 1250mm after starting 500s by blowing, and oxygen feeding stop blows, and is poured out by molten steel.
The present invention carries out semisteel smelting 50 times according to technique scheme, smelts after terminating, carries out chemical analysis to converter molten steel, and the win bit rate of phosphorus content≤0.03% in statistics molten steel, result shows that the qualification rate of phosphorus content≤0.03% in molten steel is 65%.
As can be seen from the above embodiments, after using semisteel smelting technique provided by the invention to carry out semisteel smelting, in molten steel, the qualification rate of phosphorus content≤0.03% is 65%, illustrates that semisteel smelting technique provided by the invention has good dephosphorization effect.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a semisteel smelting technique, comprises the following steps:
With oxygen supply by lance, half steel and compound slag charge are blown, obtains molten steel;
Described compound slag charge comprises lime, light dolomite and dephosphorization dissolving agent;
Described dephosphorization dissolving agent comprises the component of following massfraction:
CaO：25～45％；
MgO：12～30％；
FeO：8～25％；
SiO
2：8～25％。
2. semisteel smelting technique according to claim 1, is characterized in that, in described compound slag charge, the mass ratio of lime, light dolomite and dephosphorization dissolving agent is 1:(0.25 ~ 0.5): (0.2 ~ 0.4).
3. semisteel smelting technique according to claim 1, is characterized in that, adds gauge with the converter that capacity is 80 tons, and the consumption of described compound slag charge is 4000 ~ 6000Kg/ stove.
4. the semisteel smelting technique according to claims 1 to 3 any one, it is characterized in that, described compound slag charge divides three times and adds, before described blowing starts, first time adds compound slag charge, and the amount that described first time adds compound slag charge is: 35 ~ 45% of lime total amount and 75 ~ 85% of light dolomite total amount;
When described blowing starts, second time adds compound slag charge, and the amount that described second time adds compound slag charge is: all dephosphorization dissolving agent and lime total amount 35 ~ 45%;
After described blowing starts, in 180 ~ 250s, third time adds compound slag charge, and the amount that described third time adds compound slag charge is: remaining lime and remaining light dolomite.
5. semisteel smelting technique according to claim 4, is characterized in that, the method that described third time adds compound slag charge is specially:
After described blowing starts in 180 ~ 250s, described remaining lime and remaining light dolomite are added at twice.
6. semisteel smelting technique according to claim 1, is characterized in that, when described blowing starts, the shower nozzle bottom end face distance half steel liquid level of oxygen rifle is 1500 ~ 1600mm.
7. semisteel smelting technique according to claim 6, is characterized in that, during described finishing blowing, oxygen rifle shower nozzle bottom end face distance half steel liquid level be 1250 ~ 1350mm.
8. semisteel smelting technique according to claim 1, is characterized in that, in 0 ~ 200s of oxygen supply, oxygen pressure is 0.7 ~ 0.75MPa;
In oxygen supply 200 ~ 500s, oxygen pressure is 0.75 ~ 0.8MPa;
Oxygen supply 500s is to smelting end, and oxygen pressure is 0.75 ~ 0.85MPa.
9. semisteel smelting technique according to claim 1, is characterized in that, in described semisteel smelting, also comprise and use half steel insulating covering agent, described half steel insulating covering agent comprises the SiC that massfraction is 30%.
10. semisteel smelting technique according to claim 1, is characterized in that, in described semisteel smelting, also comprises use graphite pebbles.
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| CN201410510804.6A CN104212943A (en) | 2014-09-28 | 2014-09-28 | Semisteel smelting technology |
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| CN201410510804.6A Pending CN104212943A (en) | 2014-09-28 | 2014-09-28 | Semisteel smelting technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107674939A (en) * | 2017-09-29 | 2018-02-09 | 四川德胜集团钒钛有限公司 | A kind of dephosphorization slagging agent and its application |
| CN112553408A (en) * | 2020-12-11 | 2021-03-26 | 四川德胜集团钒钛有限公司 | Semisteel smelting process |
| CN114277214A (en) * | 2021-12-31 | 2022-04-05 | 四川德胜集团钒钛有限公司 | Semisteel smelting furnace and steelmaking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107674939A (en) * | 2017-09-29 | 2018-02-09 | 四川德胜集团钒钛有限公司 | A kind of dephosphorization slagging agent and its application |
| CN112553408A (en) * | 2020-12-11 | 2021-03-26 | 四川德胜集团钒钛有限公司 | Semisteel smelting process |
| CN114277214A (en) * | 2021-12-31 | 2022-04-05 | 四川德胜集团钒钛有限公司 | Semisteel smelting furnace and steelmaking method |
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Application publication date: 20141217 |