CN108467919A - Vanadium titanium steel compound desulfurizing agent for molten iron and its preparation, application method - Google Patents
Vanadium titanium steel compound desulfurizing agent for molten iron and its preparation, application method Download PDFInfo
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- CN108467919A CN108467919A CN201810392803.4A CN201810392803A CN108467919A CN 108467919 A CN108467919 A CN 108467919A CN 201810392803 A CN201810392803 A CN 201810392803A CN 108467919 A CN108467919 A CN 108467919A
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- Prior art keywords
- molten iron
- titanium steel
- vanadium titanium
- desulfurizing agent
- iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Abstract
The invention discloses a kind of vanadium titanium steel compound desulfurizing agent for molten iron and its preparation, application methods, belong to technical field of hot metal pretreatment.The present invention is higher in order to solve existing desulfurizing agent cost, and utilization rate is low, to the technical problem of the desulfurizing iron effect difference of titanium steel containing vanadium, provides a kind of vanadium titanium steel compound desulfurizing agent for molten iron, the ingredient containing following mass percentage：CaO 68~74%, CaC211~15%, Mg 2~8%, Na2CO38~12%, Al 1~3% and inevitable impurity.The present invention makes that desulfurization powder density is larger, fusing point of pulvis is within the scope of vanadium titanium steel molten iron temperature by adjusting desulfurizing agent composition proportion, melts, slag utilization rate is high, and desulfurization effect is good, improves sorbent utilization, iron loss is reduced, vanadium titanium steel molten iron low cost, high efficiency desulfurization are realized.
Description
Technical field
The invention belongs to technical field of hot metal pretreatment, and in particular to a kind of vanadium titanium steel compound desulfurizing agent for molten iron and its system
Standby, application method.
Background technology
Sulphur is harmful element in the pig iron, it promotes the combination of iron and carbon, keeps iron firmly crisp, and is combined to low melting point with iron
Iron sulfide makes the pig iron generate red brittleness and lowers the mobility of iron liquid.To most of steel grades, sulphur can make its processing performance and make
Use performance depreciation.General steel grade requires sulfur content to must not exceed 0.05%, fine steel grade require sulfur content must not exceed 0.02~
0.03, ultralow-sulfur steel requires sulfur content to be less than 0.005%.
Currently, widely used molten iron desulfurizing method, first, spraying into desulfurization into molten iron by soaking the spray gun in people's molten iron
The injection desulfurization method of agent, another kind is the agitator arm that refractory material is employed in molten iron transfer, and desulfurizing agent is abundant with molten iron
It is stirred the KR methods for carrying out desulfurization.
Most of powder injection desulphurization of molten iron pretreatment in the past is the form using single desulfurizing agent, currently, blowing desulfurization is most
Use mixing or composite blowing technique, many scholars also study this, it is numerous practice have shown that, compound desulfurization is often
The utilization rate of desulfurizing agent can be effectively improved, composite blowing desulfurization can both improve desulphurizing ability production low-sulfur steel, and meet market
Demand, and desulfurization production cost can be reduced.
With the continuous development of Desulphurization of Pig Iron, two basic trends are presented in development and the application of desulfurizing agent：When with
Desulfurizing agent based on lime base；Second is that metal magnesium desulfurizer of the development with addition of lime, calcium carbide, coke etc..To improve environment, multiple
It closes and also will increasingly be taken seriously with addition of industrial residue in desulfurizing agent.Choosing and using upper, will no longer compel merely in desulfurizing agent
Seek high desulfurization rate, but more consider consumption, slag sluicing system technical-economic indexes and the mixed economy effect such as complexity
Benefit.
Patent CN101358265A discloses a kind of compound vanadium titanium steel compound desulfurizing agent for molten iron and preparation method thereof, patent
CN1154748C discloses a kind of compound vanadium titanium steel compound desulfurizing agent for molten iron and patent CN100500875C discloses one kind
Compound vanadium titanium steel compound desulfurizing agent for molten iron；Above-mentioned several desulfurizing agent essence are the addition using lime and magnesium powder as primary raw material
The slag charges such as some fluorites carry out mechanical agitation mixing, the mixing of the substances such as a kind of limy of formation, magnesium powder, fluorite, aluminium powder
Object, above-mentioned desulfurizing agent are for used by common desulfurizing iron, and the desulfurizing iron of titanium steel containing vanadium is since molten iron temperature is low, molten iron
Poor fluidity directly will necessarily cause sorbent utilization low using above-mentioned desulfurizing agent, it is of high cost the problems such as.
Invention content
The present invention is to solve existing desulfurizing agent cost is higher, utilization rate is low, poor to containing vanadium titanium steel desulfurizing iron effect
The technical issues of.
There is provided a kind of vanadium titanium steel composite desulfurization of molten iron for technical solution used by the present invention solves above-mentioned technical problem
Agent, the ingredient containing following mass percentage：CaO 68~74%, CaC211~15%, Mg 2~8%, Na2CO38~
12%, Al 1~3% and inevitable impurity.
Wherein, in vanadium titanium steel compound desulfurizing agent for molten iron described above, the vanadium titanium steel compound desulfurizing agent for molten iron is pulvis,
Its granularity is no more than 200 mesh, and is not less than 80% less than 250 mesh grades.
The present invention also provides the preparation methods of vanadium titanium steel compound desulfurizing agent for molten iron described above, include the following steps：
Raw material is distinguished into grind into powder, is carried out according to the mass percentage of ingredient in vanadium titanium steel compound desulfurizing agent for molten iron described above
Dispensing, be uniformly mixed to get.
In addition, the present invention also provides the application methods of vanadium titanium steel compound desulfurizing agent for molten iron described above, including：With lazy
Property gas be carrier, vanadium titanium steel compound desulfurizing agent for molten iron is blowed and sprayed by spray gun in vanadium titanium steel molten iron and carries out desulfurization.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, the vanadium titanium steel molten iron is compound de-
The dosage of sulphur agent is 8~12kg/t vanadium titanium steel molten iron.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, the ingredient of the vanadium titanium steel molten iron
It is with weight：C 4.1~4.8%, Mn 0.05~0.5%, V 0.2~0.4%, Si 0.03~0.4%, S
0.04~0.12%, P 0.06~1.0%, Ti 0.1~0.3%, surplus are iron and inevitable impurity.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, before desulfurization, the vanadium titanium steel molten iron
Temperature be 1200~1330 DEG C.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, using Condensed transportation by vanadium titanium steel
Compound desulfurizing agent for molten iron is blowed and sprayed by spray gun in vanadium titanium steel molten iron.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, the pressure of the injection is 0.4~
0.7Mpa, speed are 40~60kg/min.
The beneficial effects of the invention are as follows：
The present invention makes that desulfurization powder density is larger, fusing point of pulvis is in vanadium titanium steel iron by adjusting desulfurizing agent composition proportion
It within the scope of coolant-temperature gage, melts, slag utilization rate is high, and desulfurization effect is good, improves sorbent utilization, de- through inventive desulfurization agent
Molten steel sulfur content after sulphuring treatment can be reduced to 0.020% or less；Inventive desulfurization agent raw material sources are extensive, and cost of material is just
Preferably, desulfurizing agent meltdown property is good, and can substitute magnesium powder reduces desulphurization cost, reduces iron loss, realize vanadium titanium steel molten iron low cost,
High efficiency desulfurization.
Specific implementation mode
Specifically, a kind of vanadium titanium steel compound desulfurizing agent for molten iron, the ingredient containing following mass percentage：CaO 68~
74%, CaC211~15%, Mg 2~8%, Na2CO38~12%, Al 1~3% and inevitable impurity.
CaO, Mg, Na in inventive desulfurization agent2CO3And CaC2It is that the beneficiating ingredient of desulfidation is played in molten iron, and Al
Al can be generated with the oxygen in molten iron2O3, to accelerate the progress of desulphurization reaction, and Al2O3Playing reduces desulfurizing agent fusing point, adds
The effect of fast desulfurizing agent fusing, further increases desulfuration efficiency；The present invention is by each Composition Control in desulfurizing agent in suitable range
It is interior, composite desulfurizing agent basicity can be increased, the oxidisability in desulfurization system is reduced, to improve desulfurization degree.
CaO, Mg, Na in inventive desulfurization agent2CO3、CaC2Common substance in the art is derived from aluminium, such as the sources CaO
In lime, CaC2From CaC2The calcium carbide that mass content is 70%~80%, magnesium derive from passivated magnesium, and aluminium derives from pure aluminum.
In order to increase the contact area of desulfurizing agent and vanadium titanium steel molten iron, desulfurization effect is improved, vanadium titanium steel molten iron of the present invention is multiple
Conjunction desulfurizing agent is pulvis, and granularity is no more than 200 mesh, and is not less than 80% less than 250 mesh grades.
The present invention also provides the preparation methods of vanadium titanium steel compound desulfurizing agent for molten iron described above, include the following steps：
Raw material is distinguished into grind into powder, is carried out according to the mass percentage of ingredient in vanadium titanium steel compound desulfurizing agent for molten iron described above
Dispensing, be uniformly mixed to get.
In addition, the present invention also provides the application methods of vanadium titanium steel compound desulfurizing agent for molten iron described above, including：With lazy
Property gas be carrier, vanadium titanium steel compound desulfurizing agent for molten iron is blowed and sprayed by spray gun in vanadium titanium steel molten iron and carries out desulfurization.
Wherein, in the application method of vanadium titanium steel compound desulfurizing agent for molten iron described above, the vanadium titanium steel molten iron is compound de-
The dosage of sulphur agent is 8~12kg/t vanadium titanium steel molten iron；Preferably, vanadium titanium steel composite desulfurization of molten iron is conveyed using transport device for dense phase
Agent.
Since blast furnace uses the particularity of v-bearing titanomagnetite smelting, desulfurizing iron is more difficult, and blast furnace desulphurizing ability is poor, raw
The molten steel sulfur content of production is high, and the ingredient of vanadium titanium steel molten iron is with weight in the present invention：C 4.1~4.8%, Mn
0.05~0.5%, V 0.2~0.4%, Si 0.03~0.4%, S 0.04~0.12%, P 0.06~1.0%, Ti 0.1~
0.3%, surplus is iron and inevitable impurity.
Desulfurization, before desulfurization, the temperature of vanadium titanium steel molten iron are carried out to vanadium titanium steel molten iron using vanadium titanium steel compound desulfurizing agent for molten iron
It is 1200~1330 DEG C, and the fusing point of vanadium titanium steel compound desulfurizing agent for molten iron pulvis of the present invention is 1150 DEG C~1300 DEG C, it can be in vanadium
Rapid melting within the temperature range of titanium steel molten iron ensures good utilization rate and desulfurization effect；It, can be according to vanadium titanium in actual production
The composite desulfurizing agent of the temperature selection suitable fusion points of steel water.
Vanadium titanium steel compound desulfurizing agent for molten iron is sprayed into vanadium titanium steel molten iron using blowing process and carries out desulfurization by the present invention, injection
Pressure is 0.4~0.7Mpa, and speed is 40~60kg/min；It can obtain blowing and spraying the time according to speed and doctor solution consumption is blowed and sprayed,
After desulfurizing agent has been blown, desulfurization is completed.
The present invention vanadium titanium steel compound desulfurizing agent for molten iron is of low cost, significant desulfurization effect, vanadium titanium steel using the present invention
Compound desulfurizing agent for molten iron carries out desulfurization, can generate larger economic benefit；By taking the steel plant of 2,500,000 tons of annual output as an example, use
After iron melt desulfurizing agent desulfurization of the present invention, desulfurization iron loss >=10kg/t iron can be reduced, year economic benefit is as follows：Year economic benefit=
Year output of steel × iron loss reduction amount × ten thousand yuan of molten iron unit price=250 × 10 × 1.4=3500 or more.
Below by embodiment, invention is further described in detail, but does not therefore limit the scope of the present invention
Among the embodiment described range.
The preparation of vanadium titanium steel compound desulfurizing agent for molten iron in the embodiment of the present invention：
Lime, calcium carbide, passivated magnesium, sodium carbonate and aluminium are distinguished into grind into powder, it is compound de- according to corresponding vanadium titanium steel molten iron
The mass percentage of ingredient carries out dispensing in sulphur agent, is uniformly mixed to get vanadium titanium steel compound desulfurizing agent for molten iron.
Embodiment 1
Vanadium titanium steel compound desulfurizing agent for molten iron main component (weight percent) in the present embodiment：CaO：70%, CaC2：
13%, Mg：5%, Na2CO3：10%, Al：2%；The mesh of desulfurizing agent granularity≤200；Desulfurizing agent fusing point is 1260 DEG C.
Desulfurization is carried out using the present embodiment vanadium titanium steel compound desulfurizing agent for molten iron：
Vanadium-titanium-iron-water weight 143t, 1310 DEG C, injecting velocity 50kg/min, doctor solution consumption 1190kg of molten iron temperature,
It is blown time 23.8min, vanadium-titanium-iron-water chemical composition (weight percent)：4.4%C, 0.15%Si, 0.18%Mn, 0.3%V,
0.25%Ti, 0.07%P, 0.075%S, surplus are iron；After processing molten steel sulfur content be 0.016%, desulfurization slag 3335kg,
Iron content is 2145kg in desulfurization slag.
Embodiment 2
Vanadium titanium steel compound desulfurizing agent for molten iron main component (weight percent) in the present embodiment：CaO：68%, CaC2：
15%, Mg：5%, Na2CO3：10%, Al：2%；The mesh of desulfurizing agent granularity≤200；Desulfurizing agent fusing point is 1220 DEG C.
Desulfurization is carried out using the present embodiment vanadium titanium steel compound desulfurizing agent for molten iron：
Vanadium-titanium-iron-water weight 145t, 1280 DEG C, injecting velocity 45kg/min, doctor solution consumption 1210kg of molten iron temperature,
It is blown time 26.89min, vanadium-titanium-iron-water chemical composition (weight percent)：4.6%C, 0.13%Si, 0.15%Mn, 0.35%
V, 0.15%Ti, 0.075%P, 0.098%S, surplus are iron；Molten steel sulfur content is 0.017% after processing, and desulfurization slag is
3965kg, iron content is 2755kg in desulfurization slag.
Embodiment 3
Vanadium titanium steel compound desulfurizing agent for molten iron main component (weight percent) in the present embodiment：CaO：74%, CaC2：
11%, Mg：5%, Na2CO3：8%, Al：2%；The mesh of desulfurizing agent granularity≤200；Desulfurizing agent fusing point is 1250 DEG C.
Desulfurization is carried out using the present embodiment vanadium titanium steel compound desulfurizing agent for molten iron：
Vanadium-titanium-iron-water weight 136t, 1310 DEG C, injecting velocity 55kg/min, doctor solution consumption 1250kg of molten iron temperature,
It is blown time 22.72min, vanadium-titanium-iron-water chemical composition (weight percent)：4.3%C, 0.11%Si, 0.17%Mn, 0.3%
V, 0.25%Ti, 0.080%P, 0.078%S, surplus are iron；Molten steel sulfur content is 0.0114% after processing, and desulfurization slag is
3698kg, iron content is 2448kg in desulfurization slag.
Comparative example 1
When using common lime (CaO content for 90% or so) as desulfurizing agent desulfurization, desulfurizing agent is equally ground to granularity
≤ 200 mesh, molten iron parameter of the desulfurizing agent fusing point at 1500 DEG C or more, reference implementation example 1, vanadium titanium steel weight of molten iron 140t, iron
1300 DEG C of coolant-temperature gage, vanadium titanium steel molten iron chemical composition (weight percent)：4.4%C, 0.15%Si, 0.18%Mn, 0.3%V,
0.25%Ti, 0.07%P, 0.075%S, surplus are iron；Injecting velocity 50kg/min, then doctor solution consumption be up to 1600kg, spray
Blowing the time reaches 32min, and molten steel sulfur content is up to 0.025% after processing, desulfurization slag 6080kg, and iron content is in desulfurization slag
4480kg；Although still meeting steel grade requirement, sorbent consumption and desulfurization effect are much not as good as the desulfurizing agent of the present invention.
Comparative example 2
Using lime and calcium carbide, (lime is with calcium carbide in mass ratio for 3 as desulfurizing agent：1 mixing) desulfurization when, by desulfurizing agent
Equally it is ground to the mesh of granularity≤200, molten iron parameter of the desulfurizing agent fusing point at 1500 DEG C or more, reference implementation example 1, vanadium titanium steel molten iron
Weight 140t, 1300 DEG C of molten iron temperature, vanadium titanium steel molten iron chemical composition (weight percent)：4.4%C, 0.15%Si, 0.18%
Mn, 0.3%V, 0.25%Ti, 0.07%P, 0.075%S, surplus are iron；Injecting velocity 50kg/min, then doctor solution consumption is high
Up to 1550kg, the injection time reaches 32min, and molten steel sulfur content is up to 0.025% after processing, desulfurization slag 5750kg, iron in desulfurization slag
Content is 4200kg；Although still meeting steel grade requirement, sorbent consumption and desulfurization effect are much de- not as good as the present invention
Sulphur agent.
By Examples 1 to 3 and comparative example 1,2 it is found that inventive desulfurization agent dosage is small, sorbent utilization is high, through this
Molten steel sulfur content after invention desulfurizing agent desulfurization process can be reduced to 0.020% hereinafter, desulfurization degree realizes vanadium titanium higher than 80%
Steel water low cost, high efficiency desulfurization.
Claims (9)
1. vanadium titanium steel compound desulfurizing agent for molten iron, it is characterised in that：Ingredient containing following mass percentage：CaO 68~
74%, CaC211~15%, Mg 2~8%, Na2CO38~12%, Al 1~3% and inevitable impurity.
2. vanadium titanium steel compound desulfurizing agent for molten iron according to claim 1, it is characterised in that：The vanadium titanium steel molten iron is compound de-
Sulphur agent is pulvis, and granularity is no more than 200 mesh, and is not less than 80% less than 250 mesh grades.
3. the preparation method of vanadium titanium steel compound desulfurizing agent for molten iron as claimed in claim 1 or 2, it is characterised in that：Raw material is distinguished
Grind into powder is matched according to the mass percentage of ingredient in vanadium titanium steel compound desulfurizing agent for molten iron described in claims 1 or 2
Material, be uniformly mixed to get.
4. the application method of vanadium titanium steel compound desulfurizing agent for molten iron as claimed in claim 1 or 2, it is characterised in that：With inert gas
For carrier, vanadium titanium steel compound desulfurizing agent for molten iron is blowed and sprayed by spray gun in vanadium titanium steel molten iron and carries out desulfurization.
5. the application method of vanadium titanium steel compound desulfurizing agent for molten iron according to claim 4, it is characterised in that：The vanadium titanium steel
The dosage of compound desulfurizing agent for molten iron is 8~12kg/t vanadium titanium steel molten iron.
6. the application method of vanadium titanium steel compound desulfurizing agent for molten iron according to claim 4, it is characterised in that：The vanadium titanium steel
The ingredient of molten iron is with weight：C 4.1~4.8%, Mn 0.05~0.5%, V 0.2~0.4%, Si 0.03
~0.4%, S 0.04~0.12%, P 0.06~1.0%, Ti 0.1~0.3%, surplus are iron and inevitable impurity.
7. the application method of vanadium titanium steel compound desulfurizing agent for molten iron according to claim 4, it is characterised in that：Before desulfurization, institute
The temperature for stating vanadium titanium steel molten iron is 1200~1330 DEG C.
8. the application method of vanadium titanium steel compound desulfurizing agent for molten iron according to claim 4, it is characterised in that：It is defeated using concentrated phase
It send and blows and sprays vanadium titanium steel compound desulfurizing agent for molten iron in vanadium titanium steel molten iron by spray gun.
9. according to the application method of the vanadium titanium steel compound desulfurizing agent for molten iron described in claim 4~8, it is characterised in that：The spray
The pressure blown is 0.4~0.7Mpa, and speed is 40~60kg/min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928805A (en) * | 2009-06-26 | 2010-12-29 | 上海梅山钢铁股份有限公司 | Desulfurizing agent for furnace rear of converter |
| CN102041353A (en) * | 2009-10-23 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizer, preparation method thereof and desulfurization method adopting desulfurizer |
| CN102719589A (en) * | 2012-05-31 | 2012-10-10 | 攀钢集团成都钢钒有限公司 | Molten vanadium-titanium iron desulfurizing agent and preparation method thereof as well as desulfurization method using desulfurizing agent |
| CN107217122A (en) * | 2017-06-21 | 2017-09-29 | 攀钢集团攀枝花钢钒有限公司 | For desulfurizing iron or the composite desulfurizing agent and its process of half steel desulfurization |
-
2018
- 2018-04-27 CN CN201810392803.4A patent/CN108467919A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928805A (en) * | 2009-06-26 | 2010-12-29 | 上海梅山钢铁股份有限公司 | Desulfurizing agent for furnace rear of converter |
| CN102041353A (en) * | 2009-10-23 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizer, preparation method thereof and desulfurization method adopting desulfurizer |
| CN102719589A (en) * | 2012-05-31 | 2012-10-10 | 攀钢集团成都钢钒有限公司 | Molten vanadium-titanium iron desulfurizing agent and preparation method thereof as well as desulfurization method using desulfurizing agent |
| CN107217122A (en) * | 2017-06-21 | 2017-09-29 | 攀钢集团攀枝花钢钒有限公司 | For desulfurizing iron or the composite desulfurizing agent and its process of half steel desulfurization |
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Application publication date: 20180831 |