CN106521078A - Vanadium extracting converter slag adjusting method - Google Patents

Vanadium extracting converter slag adjusting method Download PDF

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Publication number
CN106521078A
CN106521078A CN201610989802.9A CN201610989802A CN106521078A CN 106521078 A CN106521078 A CN 106521078A CN 201610989802 A CN201610989802 A CN 201610989802A CN 106521078 A CN106521078 A CN 106521078A
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CN
China
Prior art keywords
sodium salt
vanadium
modifying agent
slag
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610989802.9A
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Chinese (zh)
Inventor
梁新腾
曾建华
陈永
李扬洲
杨森祥
陈均
陈路
龚洪君
喻林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Original Assignee
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd filed Critical Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority to CN201610989802.9A priority Critical patent/CN106521078A/en
Publication of CN106521078A publication Critical patent/CN106521078A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/36Processes yielding slags of special composition

Abstract

The invention relates to a vanadium extracting converter slag adjusting method, and belongs to the technical field of converter vanadium extraction. The technical problem to be solved by the invention is to provide the vanadium extracting converter slag adjusting method capable of further reducing the iron loss. The method comprises the following steps: molten vanadium-titanium contained iron is mixed into a converter; a sodium salt modifying agent is added within one minute before ending of blowing; and after the blowing is finished, the tapping is performed to obtain semisteel and vanadium slag. Before the blowing is finished, the sodium salt modifying agent is adopted to adjust the slag; and the converter vanadium slag components can be controlled within a proper range before tapping of the converter, so that the purposes of reducing the vanadium slag melting point, optimizing the vanadium slag slag-iron separation effect and reducing the steel-iron consumption are achieved.

Description

Converter extracting vanadium Slag modification method
Technical field
The present invention relates to converter extracting vanadium Slag modification method, belongs to vanadium extraction by converter blowing technical field.
Background technology
The cardinal principle of vanadium extraction is exactly the principle using selective oxidation, using high speed pure oxygen jet in top-blown converter to containing Vanadium-containing molten iron is stirred, and the vanadium in molten iron is oxidized to a kind of physical-chemical reaction that the stable barium oxide of high price produces vanadium slag Process.Bath temperature is controlled below carbon vanadium inversion temperature by adding coolant during the course of the reaction, " going vanadium to protect carbon " is reached Purpose.
The oxidation reaction of vanadium is:
2/3[V]+1/2{O2(the V of }=1/32O3) (1)
2 [V]+3 (FeO)=(V2O3)+3[Fe] (2)
Vanadium has 2 kinds of reactions under the conditions of oxygen blast, and one is [V] and oxygen direct oxidation reaction in molten iron, and another kind is oxygen Gas generates FeO with ferrum reaction, and FeO generates V with V reactions again2O3, the ferrum in molten iron aoxidized strongly and forms irony blowing the vanadium initial stage First slag, after irony slag occurs on the surface, as which has oxidisability, is reacted on interface in metal-slag immediately (2), wherein reaction (2) is dominant response, because the mass fraction of Fe is significantly greater than the mass fraction of V in molten iron in molten iron, its More than 90%, substantial amounts of Fe is contacted middle Fe with oxygen, generates FeO, and only a small amount of V directly occurs oxidation reaction with oxygen. As vanadium extraction reaction is mainly reacted between irony first slag and molten iron level.Vanadium oxidation is mainly with the side of reaction (2) Formula is carried out, and is the oxidation for promoting vanadium, vanadium extraction oxygen blast terminates in slag containing substantial amounts of FeO, simultaneously because high speed oxygen jet is stirred Mix, a large amount of tiny iron shot wrapped folders are in vanadium slag.Now, if vanadium extraction oxygen blast terminates, directly the tapping of falling stove, pour out vanadium slag, in a large number Metallic iron can be lost in pouring out with vanadium slag.
To overcome disadvantages described above, conventional method is carbonaceous reducing agent or adds ferrosilicon to reduce FeO at present, reduces ferrum Damage.Due to vanadium extraction terminal, to turn in-furnace temperature relatively low, and typically at 1350~1400 DEG C, at this temperature, conventional carbonaceous is also Former agent cannot be melted in half steel or in vanadium slag, therefore acts on limited.
Patent CN104195283A discloses a kind of vanadium slag modifying agent and vanadium extraction by converter blowing smelting process of vanadium extraction by converter blowing.Vanadium slag Modifying agent is the ferrosilicon granule being made up of the Fe of the Si and 30~35 weight portions of 65~70 weight portions.Vanadium extraction by converter blowing smelting process bag Include:After vanadium extraction by converter blowing oxygen blast terminates, enter ferrosilicon granule in Converter top of the slag upslide, stand, then stove goes out half steel and vanadium slag, Wherein, the particle diameter of the ferrosilicon granule is not more than 3mm.The addition of the ferrosilicon granule is 0.1~0.2kg/ ton steel.By this The use of vanadium slag modifying agent, can reduce all iron content in vanadium slag, and be able to ensure that or improve v slag grade.
But, using ferrosilicon as vanadium slag modifying agent, the silicone content in molten steel can be increased, after increasing heat, and use, though So can a certain degree of all iron content reduced in vanadium slag, but all iron content in vanadium slag remains unchanged higher, needs further drop It is low.Although additionally, ferrosilicon reduce vanadium slag oxidisability, promote slag sluicing system effect it is relatively good, ferrosilicon price costly, Generally 6000 yuan/t or so, relatively costly.
The content of the invention
For problem above, present invention solves the technical problem that be to provide a kind of vanadium extraction that can further reduce iron loss turning Stove Slag modification method
Converter extracting vanadium Slag modification method of the present invention, hot metal containing V-Ti is blended in converter, before finishing blowing in 1min, adds sodium Salt modifying agent, after finishing blowing, tapping obtains half steel and vanadium slag;
Wherein, the sodium salt modifying agent is consisted of the following components in percentage by weight:Sodium salt is 95~98%, and remaining is viscous Knot agent.
Wherein, the chemical composition of the hot metal containing V-Ti is C:3.5~4.8%, Si:0.1~1.0%, Mn:0.1~ 1.0%th, V:0.05~0.4%, Ti:0.05~0.5%, remaining is TFe.
Preferably, according to molten iron Si contents determining the addition of sodium salt modifying agent.When molten iron Si content≤0.04%, The addition of sodium salt modifying agent is 1.7~2.0kg/t ferrum;When 0.04% < molten iron Si content≤0.07%, sodium salt modifying agent Addition be 1.3~1.5kg/t ferrum;When 0.07% < molten iron Si content≤0.11%, the addition of sodium salt modifying agent is 1.0~1.2kg/t ferrum, when molten iron Si contents > 0.11%, is then not added with sodium salt modifying agent.
Further, preferably the sodium salt modifying agent is spherical, and particle diameter is 30~50mm.
Further, the chemical composition of the preferably sodium salt is:Na2CO3Content >=98wt%, remaining is SiO2
Preferably, the granularity of the sodium salt is 1~3mm.
Preferably, the binding agent is high-strength cement.
Compared with prior art, the present invention has the advantages that:
The present invention before finishing blowing, using sodium salt modifying agent residue adjustment, can before converter tapping just by Converter Vanadium-bearing Slag into Sub-control system to reduce vanadium slag fusing point, optimizes vanadium slag slag sluicing system effect, reduces steel technology in a suitable scope Purpose.Using method of the invention, it is possible on the premise of half composition of steel and vanadium slag quality is not affected, by vanadium slag TFe contents are reduced to less than 15%.Additionally, the common sodium salt price that the present invention is adopted is typically within 2000 yuan/t, with bright Aobvious price advantage.
Specific embodiment
Converter extracting vanadium Slag modification method of the present invention, hot metal containing V-Ti is blended in converter, before finishing blowing in 1min, adds sodium Salt modifying agent, after finishing blowing, tapping obtains half steel and vanadium slag;
Wherein, the sodium salt modifying agent is consisted of the following components in percentage by weight:Industrial chemicals sodium salt is 95~98%, Remaining is binding agent.As sodium salt granule is typically all very tiny powdery, therefore, it is necessary to briquetting could feeding bin.
Wherein, the chemical composition of the hot metal containing V-Ti is C:3.5~4.8%, Si:0.1~1.0%, Mn:0.1~ 1.0%th, V:0.05~0.4%, Ti:0.05~0.5%, remaining is TFe (full ferrum).
The temperature of hot metal containing V-Ti is 1250~1390 DEG C.
The inventive method is applied to the situation of molten iron silicon content≤0.11% after blowing.Preferably, according to molten iron Si contents To determine the addition of sodium salt modifying agent.When molten iron Si content≤0.04%, the addition of sodium salt modifying agent is 1.7~ 2.0kg/t ferrum;When 0.04% < molten iron Si content≤0.07%, the addition of sodium salt modifying agent is 1.3~1.5kg/t ferrum; When 0.07% < molten iron Si content≤0.11%, the addition of sodium salt modifying agent is 1.0~1.2kg/t ferrum, when molten iron Si contains Amount > 0.11%, then be not added with sodium salt modifying agent.
Further, preferably the sodium salt modifying agent is spherical, and particle diameter is 30~50mm.
Further, the chemical composition of the preferably sodium salt is:Na2CO3Content >=98wt%, remaining is SiO2
Preferably, the granularity of the sodium salt is 1~3mm.
Binding agent commonly used in the art is applied to the present invention.Preferably, the binding agent is high-strength cement.
The sodium salt modifying agent of the present invention is preferably adopted and is prepared with the following method:Sodium salt granule is sufficiently mixed with binding agent Afterwards, the bead of 30~50mm is mechanically pressed into through ball press, then it is toasted remove moisture removal after, obtain sodium salt modifying agent.
The vanadium extraction by converter blowing operation that the present invention is not mentioned is state of the art, will not be described here.
The specific embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit System is among described scope of embodiments.
Embodiment 1
Sodium salt, high-strength cement are added water according to the following ratio and be sufficiently mixed:Sodium salt:95%, high-strength cement:5%, utilize Ball press is pressed into the pelletizing of a diameter of 35mm, through baking remove water after make sodium salt modifying agent finished product, wherein, sodium salt it is main Composition is:Na2CO3Content >=98%, remaining is SiO2
In the 120 tons of converters of certain steel mill, its half steel molten steel discrepancy amount is 133t.The 1min before end is bessemerized, determines ferrum Si contents in water are 0.04%, add this kind of sodium salt modifying agent finished product 1.8kg/t steel, after finishing blowing, tapping.Sampled point Analysis, in vanadium slag, TFe contents are down to 14% by original 38%, and vanadium slag TFe is effectively reduced.
Embodiment 2
Sodium salt, high-strength cement are added water according to the following ratio and be sufficiently mixed:Sodium salt:98%, high-strength cement:2%, utilize Ball press is pressed into the pelletizing of a diameter of 50mm, through baking remove water after make sodium salt modifying agent finished product, wherein, sodium salt it is main Composition is:Na2CO3Content >=98%, remaining is SiO2
In the 120 tons of converters of certain steel mill, its half steel molten steel discrepancy amount is 135t.The 1min before end is bessemerized, determines ferrum Si contents in water are 0.05%, add this kind of sodium salt modifying agent finished product 1.4kg/t steel, after finishing blowing, tapping.Sampled point Analysis, in vanadium slag, TFe contents are down to 13% by original 39%, and vanadium slag TFe is effectively reduced.
Embodiment 3
Sodium salt, high-strength cement are added water according to the following ratio and be sufficiently mixed:Sodium salt:95%, high-strength cement:5%, utilize Ball press is pressed into the pelletizing of a diameter of 30mm, through baking remove water after make sodium salt modifying agent finished product, wherein, sodium salt it is main Composition is:Na2CO3Content >=98%, remaining is SiO2
In the 120 tons of converters of certain steel mill, its half steel molten steel discrepancy amount is 133t.The 1min before end is bessemerized, determines ferrum Si contents in water are 0.08%, add this kind of vanadium slag modifying agent finished product 1.1kg/t steel, after finishing blowing, tapping.Sampled point Analysis, in vanadium slag, TFe contents are down to 13% by original 37%, and vanadium slag TFe is effectively reduced.
Comparative example 1
In the 120 tons of converters of certain steel mill, its half steel molten steel discrepancy amount is 130t, bessemerizing end, not plus any residue adjustment The i.e. tapping of falling stove of material.Sampled analysis, in slag, TFe contents are up to 40%, and in vanadium slag, TFe contents are higher, slag iron is regardless of carrying Vanadium cost is dramatically increased.
Comparative example 2
In the 120 tons of converters of certain steel mill, its half steel molten steel discrepancy amount is 133t.The 1min before end is bessemerized, determines ferrum Si contents in water are 0.08%, add the ferrosilicon granule (silicon in the composition and CN104195283A of the ferrosilicon granule in example 1 Iron particle is identical) 1.1kg/t steel, after finishing blowing, tapping.Sampled analysis, in vanadium slag, TFe contents are down to by original 36% 25%, vanadium slag TFe is effectively reduced, but certainly increased the cost of smelting.

Claims (7)

1. converter extracting vanadium Slag modification method, it is characterised in that comprise the steps:Hot metal containing V-Ti is blended in converter, blowing knot Before beam in 1min, sodium salt modifying agent is added, after finishing blowing, tapping obtains half steel and vanadium slag;
Wherein, the sodium salt modifying agent is consisted of the following components in percentage by weight:Sodium salt is 95~98%, and remaining is bonding Agent.
2. converter extracting vanadium Slag modification method according to claim 1, it is characterised in that:The chemical composition of the hot metal containing V-Ti For C:3.5~4.8%, Si:0.1~1.0%, Mn:0.1~1.0%, V:0.05~0.4%, Ti:0.05~0.5%, remaining For TFe.
3. converter extracting vanadium Slag modification method according to claim 1 and 2, it is characterised in that:Determined according to molten iron Si contents The addition of sodium salt modifying agent, when Si content≤0.04% in molten iron, the addition of sodium salt modifying agent is 1.7~2.0kg/t Ferrum;When 0.04% < molten iron Si content≤0.07%, the addition of sodium salt modifying agent is 1.3~1.5kg/t ferrum;When 0.07% During < molten iron Si content≤0.11%, the addition of sodium salt modifying agent is 1.0~1.2kg/t ferrum, when molten iron Si contents > 0.11%, then it is not added with sodium salt modifying agent.
4. the converter extracting vanadium Slag modification method according to any one of claims 1 to 3, it is characterised in that:The sodium salt modifying agent For spherical, particle diameter is 30~50mm.
5. the converter extracting vanadium Slag modification method according to any one of Claims 1 to 4, it is characterised in that:The chemistry of the sodium salt Composition is:Carbonate content >=98wt%, remaining is SiO2
6. the converter extracting vanadium Slag modification method according to any one of Claims 1 to 5, it is characterised in that:The granularity of the sodium salt For 1~3mm.
7. the converter extracting vanadium Slag modification method according to any one of claim 1~6, it is characterised in that:The binding agent is water Mud.
CN201610989802.9A 2016-11-10 2016-11-10 Vanadium extracting converter slag adjusting method Pending CN106521078A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111349797A (en) * 2020-03-18 2020-06-30 玉溪新兴钢铁有限公司 Method for extracting vanadium from ultra-low silicon vanadium-titanium molten iron by converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2201467C2 (en) * 2001-01-22 2003-03-27 Анатолий Матвеевич Новик Method of production of vanadium-containing ferroalloy
CN104032094A (en) * 2014-06-19 2014-09-10 攀钢集团攀枝花钢铁研究院有限公司 Desulfurization slag modifying agent and molten iron desulfurization method
CN104032096A (en) * 2014-06-19 2014-09-10 攀钢集团攀枝花钢铁研究院有限公司 Desulfurization slag modifying agent and molten iron desulfurization method
CN104195283A (en) * 2014-09-16 2014-12-10 攀钢集团西昌钢钒有限公司 Vanadium slag modifier for converter vanadium extraction and converter vanadium extraction smelting method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2201467C2 (en) * 2001-01-22 2003-03-27 Анатолий Матвеевич Новик Method of production of vanadium-containing ferroalloy
CN104032094A (en) * 2014-06-19 2014-09-10 攀钢集团攀枝花钢铁研究院有限公司 Desulfurization slag modifying agent and molten iron desulfurization method
CN104032096A (en) * 2014-06-19 2014-09-10 攀钢集团攀枝花钢铁研究院有限公司 Desulfurization slag modifying agent and molten iron desulfurization method
CN104195283A (en) * 2014-09-16 2014-12-10 攀钢集团西昌钢钒有限公司 Vanadium slag modifier for converter vanadium extraction and converter vanadium extraction smelting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111349797A (en) * 2020-03-18 2020-06-30 玉溪新兴钢铁有限公司 Method for extracting vanadium from ultra-low silicon vanadium-titanium molten iron by converter

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Application publication date: 20170322

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