CN111041156A - Single-station molten iron treatment process - Google Patents
Single-station molten iron treatment process Download PDFInfo
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- CN111041156A CN111041156A CN201911364122.8A CN201911364122A CN111041156A CN 111041156 A CN111041156 A CN 111041156A CN 201911364122 A CN201911364122 A CN 201911364122A CN 111041156 A CN111041156 A CN 111041156A
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- molten 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
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a single-station molten iron treatment process, which belongs to the technical field of steelmaking pretreatment and comprises the following steps: a. an oxygen lance device for blowing oxygen into molten iron is additionally arranged on a desulfurization station; b. hoisting the ladle filled with molten iron to the desulfurization station, treating by adopting a composite blowing desulfurization process, and then completely removing desulfurization slag; c. when vanadium extraction or desiliconization is carried out, oxygen is supplied to the molten iron in the ladle through an oxygen lance device, iron oxide ball is put into the process of vanadium extraction, and vanadium slag or silicon slag is removed after the oxygen supply is finished; d. when dephosphorization is needed, adding iron oxide leather balls into the molten iron of the ladle, blowing lime powder, supplying oxygen through an oxygen lance device, and removing the dephosphorization slag after oxygen supply is finished. The invention can realize that vanadium extraction and 'three-removal' treatment can be carried out on vanadium-containing molten iron only on one station, and can solve the problems of vanadium element loss, influence on the stability of a blast furnace, high production organization difficulty and the like caused by alternate production of common iron and vanadium-containing iron in the service of the vanadium extraction converter.
Description
Technical Field
The invention belongs to the technical field of steelmaking pretreatment, and particularly relates to a single-station molten iron treatment process.
Background
The process for extracting vanadium from vanadium-containing molten iron by using a converter to obtain vanadium slag is widely applied to the metallurgical industry, and the production process for smelting clean steel after the vanadium-containing molten iron is subjected to 'three-removal' pretreatment of desulfurization, dephosphorization and desilicication is mature. At present, the vanadium extraction treatment mainly uses a converter for vanadium extraction production, when the vanadium extraction converter is in service, ordinary iron can only be produced by using a 'three-removing' station, and when vanadium-containing molten iron is smelted again, vanadium element is lost, steel enterprise cost is increased, resources are wasted, and if the ordinary molten iron is changed into the iron smelting, a material distribution mode needs to be changed, the ordinary iron and the vanadium-containing iron are alternately produced, the stability of a blast furnace is influenced, and the production organization difficulty of the method is high.
Disclosure of Invention
The invention aims to provide a single-station molten iron treatment process to solve the technical problem that in the prior art, vanadium molten iron and ordinary iron are alternately produced when a vanadium extraction converter is in service.
In order to achieve the purpose, the invention adopts the technical scheme that: the single-station molten iron treatment process comprises the following steps:
a. an oxygen lance device for blowing oxygen into molten iron is additionally arranged on a desulfurization station;
b. hoisting the ladle filled with molten iron to the desulfurization station, treating by adopting a composite blowing desulfurization process, and then completely removing desulfurization slag;
c. carrying out vanadium extraction and/or desiliconization, carrying out oxygen supply on molten iron in a ladle through an oxygen lance device, putting iron oxide ball during the vanadium extraction process, and removing vanadium slag and/or silicon slag after the oxygen supply is finished;
d. dephosphorizing, adding iron oxide ball into molten iron in the ladle, blowing lime powder, supplying oxygen through an oxygen lance device, and removing dephosphorized slag after oxygen supply is finished;
e. after all slag skimming is finished, directly adding the slag into a steelmaking converter for steelmaking operation.
In one embodiment of the present invention, in the step b, the composite blowing desulfurization process is to mix magnesium powder and calcium oxide powder and then blow the mixture into molten iron in a fluid state.
In one embodiment of the invention, in the step b, the mass ratio of the lime powder to the magnesium powder in the desulfurization process is 1: 1.5 to 2.
In one embodiment of the present invention, in the step c, 8 to 40kg/t of iron oxide pellets are charged, and the oxygen supply intensity is 0.25 to 0.4M3/(min·t)。
In one embodiment of the invention, after vanadium extraction treatment in the step c, 3-8 kg/t of iron oxide ball and 4-6 kg/t of blown lime powder are added in the step d, and the oxygen supply intensity is 0.25-0.4M3/(min·t)。
In one embodiment of the invention, if vanadium extraction is not performed in the step c, in the step d, the addition amount of the scale balls is 3-5 kg/t, the blowing amount of the lime powder is 5-10 kg/t, and the oxygen supply intensity is 0.25-0.40M3/(min·t)。
In one embodiment of the invention, in the steps b-d, the slag removing process is carried out by using a slag car, the slag car is provided with 2 slag trays by using one slag car, one slag tray is used for containing desulfurization or dephosphorization slag, and the other slag tray is used for containing vanadium slag.
In one embodiment of the invention, in the steps b-d, before slag skimming, nitrogen is introduced into the molten iron along the tangential direction of the ladle, so that the molten iron rotates in the ladle.
In one embodiment of the invention, the oxygen lance device is used for blowing mixed gas of oxygen and nitrogen, the oxygen is gradually added according to the requirement, and the nitrogen is introduced in an amount that the gas sprayed by the oxygen lance device can enable molten iron to rotate in a foundry ladle.
In one embodiment of the invention, the oxygen content of the oxygen raw material injected in the oxygen lance device is greater than or equal to 95 percent, and the nitrogen content of the nitrogen raw material injected in the oxygen lance device is greater than or equal to 99 percent.
The single-station molten iron treatment process provided by the invention has the beneficial effects that: compared with the prior art, the invention improves the existing 'three-removing' station, can realize that vanadium extraction and 'three-removing' treatment can be carried out on vanadium-containing molten iron only on one station, can solve the problems of vanadium element loss, influence on the stability of a blast furnace, high production organization difficulty and the like caused by the alternate production of common iron and vanadium-containing iron during the service of a vanadium extraction converter, can improve the utilization rate of single-station equipment, has more reasonable production matching, and is beneficial to the shortening of the molten iron treatment time.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Now, a single-station molten iron treatment process provided by the invention will be explained.
The invention provides a single-station molten iron treatment process, which comprises the following steps:
a. an oxygen lance device for blowing oxygen into molten iron is additionally arranged on a desulfurization station;
b. hoisting the ladle filled with molten iron to the desulfurization station, treating by adopting a composite blowing desulfurization process, and then completely removing desulfurization slag;
c. when vanadium extraction and/or desiliconization are carried out, oxygen is supplied to the molten iron in the ladle through an oxygen lance device, iron oxide ball is put into the process of vanadium extraction, and vanadium slag and/or silicon slag are removed after the oxygen supply is finished;
d. dephosphorizing, adding iron oxide ball into molten iron in the ladle, blowing lime powder, supplying oxygen through an oxygen lance device, and removing dephosphorized slag after oxygen supply is finished;
e. after all slag skimming is finished, directly adding the slag into a steelmaking converter for steelmaking operation.
Compared with the prior art, the single-station molten iron treatment process provided by the invention has the advantages that the existing 'three-separation' station is improved, vanadium extraction and 'three-separation' treatment can be carried out on vanadium-containing molten iron only on one station, the problems of vanadium element loss, influence on the stability of a blast furnace, high difficulty of production organization and the like caused by alternate production of common iron and vanadium-containing iron in the service of a vanadium extraction converter can be solved, the utilization rate of single-station equipment can be improved, the production matching is more reasonable, and the process is favorable for shortening the molten iron treatment time.
As a specific implementation manner of the single-station molten iron treatment process provided by the present invention, in the step b, the composite blowing desulfurization process is to mix magnesium powder and calcium oxide powder and then blow the mixture into molten iron in a fluid state.
As a specific implementation manner of the single-station molten iron treatment process provided by the invention, in the step b, the mass ratio of the lime powder to the magnesium powder in the desulfurization process is 1: 1.5 to 2. In the step c, 8 to 40kg/t of iron oxide ball is put in, and the oxygen supply intensity is 0.25 to 0.4M3/(min. t). In the step c, after vanadium extraction treatment, in the step d, 3-8 kg/t of iron oxide leather balls are added, 4-6 kg/t of lime powder is sprayed, and the oxygen supply intensity is 0.25-0.4M3V (min. t); in the step c, if vanadium extraction is not carried out, in the step d, the addition amount of the iron scale balls is 3-5 kg/t, the blowing of lime powder is 5-10 kg/t, and the oxygen supply intensity is 0.25-0.40M3/(min·t)。
As a specific implementation manner of the single-station molten iron treatment process provided by the invention, in the steps b-d, the slag-off process is carried out by using a slag car, the slag car is provided with 2 slag trays by using one slag car, one slag tray is used for containing desulfurization or dephosphorization slag, and the other slag tray is used for containing vanadium slag.
As a specific embodiment of the single-station molten iron treatment process provided by the invention, in the steps b-d, before slag skimming, nitrogen is introduced into the molten iron along the tangential direction of the ladle, so that the molten iron rotates in the ladle, and the desulfurized slag, the dephosphorized slag, the desilicated slag or the vanadium slag are aggregated, thereby facilitating slag skimming. Meanwhile, a trace amount of nitrogen is left in the molten iron after the nitrogen is introduced, and the quality of the molten iron can be improved by matching the nitrogen with the vanadium.
In one embodiment of the single-station molten iron treatment process provided by the invention, the oxygen lance device is used for blowing mixed gas of oxygen and nitrogen, the introduced amount of the oxygen is gradually added according to requirements, and the introduced amount of the nitrogen enables the gas sprayed by the oxygen lance device to enable molten iron to rotate in a ladle.
In a specific embodiment of the single-station molten iron treatment process provided by the invention, the oxygen content in the oxygen raw material blown into the oxygen gun device is greater than or equal to 95%, and the nitrogen content in the nitrogen raw material blown into the oxygen gun device is greater than or equal to 99%.
The scheme and effect of the invention are further illustrated by the following specific examples.
Table of changes of V, Si, Ti, P, S before and after pretreatment of molten iron
| Molten iron | w【V】 | w【Si】 | w【Ti】 | w【P】 | w【S】 |
| Before pretreatment | 0.2-0.27％ | 0.10-0.35％ | 0.10-0.35％ | 0.08-0.12％ | 0.04-0.100％ |
| After pretreatment | ≤0.050％ | ≤0.050％ | ≤0.050％ | ≤0.050％ | ≤0.030％ |
The following specific examples are provided:
example 1:
the charging amount of the ladle is 130 tons, and the molten iron content:
| molten iron | w【V】 | w【Si】 | w【Ti】 | w【P】 | w【S】 |
| Before pretreatment | 0.22％ | 0.20％ | 0.15％ | 0.115％ | 0.05％ |
Hanging to a station to firstly carry out desulfurization treatment, wherein the desulfurization effect and desulfurization technological parameters are as follows:
| initial sulfur | End point sulfur | Blowing lime powder | Blowing magnesium powder | Time of blowing | Period of time |
| 0.05％ | 0.02％ | 42kg | 72kg | 420S | 13min |
After the desulfurized slag is removed and enters a desulfurized slag tray, an oxygen lance is arranged for supplying oxygen to the molten iron in the ladle, and vanadium extraction is started, wherein the vanadium extraction effect and the vanadium extraction process parameters are as follows:
after vanadium slag is removed and enters a vanadium slag pan after vanadium extraction, oxygen supply operation is continuously carried out on molten iron in a foundry ladle, dephosphorization is started, and the dephosphorization effect and the dephosphorization technological parameters are as follows:
| initial phosphorus | Endpoint phosphorus | Blowing lime powder | Adding amount of iron sheet ball | Oxygen supply intensity | Period of time |
| 0.115％ | 0.06％ | 656kg | 429kg | 2.4 | 15min |
And after dephosphorization, slagging off, namely slagging off the dephosphorized slag into a desulfurizing slag pan, and hoisting a ladle to be added into a converter for steelmaking treatment.
Example 2:
the charging amount of the ladle is 132 tons, and the molten iron content:
| molten iron | w【V】 | w【Si】 | w【Ti】 | w【P】 | w【S】 |
| Before pretreatment | 0.226％ | 0.18％ | 0.16％ | 0.122％ | 0.065％ |
Hanging to a station to firstly carry out desulfurization treatment, wherein the desulfurization effect and desulfurization technological parameters are as follows:
| initial sulfur | End point sulfur | Blowing lime powder | Blowing magnesium powder | Time of blowing | Period of time |
| 0.065％ | 0.023％ | 56kg | 81kg | 482S | 15min |
After the desulfurized slag is removed and enters a desulfurized slag tray, an oxygen lance is arranged for supplying oxygen to the molten iron in the ladle, and vanadium extraction is started, wherein the vanadium extraction effect and the vanadium extraction process parameters are as follows:
| initial silicon | Incipient vanadium | Endpoint silicon | End point vanadium | Adding amount of iron sheet ball | Oxygen supply intensity |
| 0.18％ | 0.226％ | 0.018％ | 0.048％ | 2100kg | 0.30 |
After vanadium slag is removed and enters a vanadium slag pan after vanadium extraction, oxygen supply operation is continuously carried out on molten iron in a foundry ladle, dephosphorization is started, and the dephosphorization effect and the dephosphorization technological parameters are as follows:
| initial phosphorus | Endpoint phosphorus | Blowing lime powder | Adding amount of iron sheet ball | Oxygen supply intensity | Period of time |
| 0.122％ | 0.058％ | 789kg | 521kg | 2.4 | 17min |
And after dephosphorization, slagging off, namely slagging off the dephosphorized slag into a desulfurizing slag pan, and hoisting a ladle to be added into a converter for steelmaking treatment.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The single-station molten iron treatment process is characterized by comprising the following steps of:
a. an oxygen lance device for blowing oxygen into molten iron is additionally arranged on a desulfurization station;
b. hoisting the ladle filled with molten iron to the desulfurization station, treating by adopting a composite blowing desulfurization process, and then completely removing desulfurization slag;
c. carrying out vanadium extraction and/or desiliconization, supplying oxygen to molten iron in a ladle through an oxygen lance device, putting iron oxide ball during the vanadium extraction process, and removing vanadium slag and/or silicon slag after the oxygen supply is finished;
d. carrying out dephosphorization treatment, continuously adding iron oxide leather balls into molten iron of the ladle, blowing lime powder, supplying oxygen through an oxygen lance device, and removing dephosphorization residues after oxygen supply is finished;
e. after all slag skimming is finished, directly adding the slag into a steelmaking converter for steelmaking operation.
2. The single-station molten iron treatment process according to claim 1, characterized in that: in the step b, the composite blowing desulfurization process is to blow fluidized magnesium powder and calcium oxide powder into molten iron after mixing.
3. The single-station molten iron treatment process according to claim 2, characterized in that: in the step b, the mass ratio of the lime powder to the magnesium powder in the desulfurization process is 1: 1.5 to 2.
4. The single-station molten iron treatment process according to claim 1, characterized in that: in the step c, 8 to 40kg/t of iron oxide ball is put in, and the oxygen supply intensity is 0.25 to 0.4M3/(min·t)。
5. The single-station molten iron treatment process according to claim 1, characterized in that: in the step c, after vanadium extraction treatment, in the step d, 3-8 kg/t of iron oxide leather balls are added, 4-6 kg/t of lime powder is sprayed, and the oxygen supply intensity is 0.25-0.4M3/(min·t)。
6. The single-station molten iron treatment process according to claim 1, characterized in that: if the vanadium extraction treatment is not carried out in the step c, the adding amount of the iron scale balls in the step d is 3-5 kg/t,5-10 kg/t of blown lime powder and 0.25-0.40M of oxygen supply intensity3/(min·t)。
7. The single-station molten iron treatment process according to claim 1, characterized in that: in the steps b-d, the slag removing process is carried by using a slag car, the slag car is provided with 2 slag trays by using one slag car, one slag tray is used for containing desulfurization or dephosphorization slag, and the other slag tray is used for containing vanadium slag.
8. The single-station molten iron treatment process according to claim 1, characterized in that: and c, introducing nitrogen into the molten iron along the tangential direction of the ladle before slagging off so as to enable the molten iron to rotate in the ladle.
9. The single-station molten iron treatment process according to claim 8, characterized in that: and the oxygen lance device is used for blowing mixed gas of oxygen and nitrogen, the introduction amount of the oxygen is gradually added according to the requirement, and the gas sprayed by the oxygen lance device can enable molten iron to rotate in a ladle due to the introduction amount of the nitrogen.
10. The single-station molten iron treatment process according to claim 9, characterized in that: the oxygen content in the oxygen raw material blown in the oxygen lance device is more than or equal to 95 percent, and the nitrogen content in the nitrogen raw material blown in the oxygen lance device is more than or equal to 99 percent.
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Citations (8)
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|---|---|---|---|---|
| JPS5763647A (en) * | 1980-09-30 | 1982-04-17 | Sumitomo Metal Ind Ltd | Recovering method for vanadium from molten iron |
| JPH0849004A (en) * | 1994-08-03 | 1996-02-20 | Nippon Steel Corp | Pre-treatment of molten iron |
| CN101020941A (en) * | 2007-03-14 | 2007-08-22 | 张登山 | Molten iron pre-treating method and apparatus |
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2019
- 2019-12-26 CN CN201911364122.8A patent/CN111041156A/en active Pending
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| JPS5763647A (en) * | 1980-09-30 | 1982-04-17 | Sumitomo Metal Ind Ltd | Recovering method for vanadium from molten iron |
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| CN104480251A (en) * | 2014-12-05 | 2015-04-01 | 中冶京诚工程技术有限公司 | Pretreatment device for simultaneously desulfurizing, desiliconizing and dephosphorizing molten iron, and application and smelting method thereof |
| CN105018670A (en) * | 2015-07-15 | 2015-11-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting rail steel with vanadium-bearing hot metal as raw materials |
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| 刘茂盛等: "《国外钒钛》", 31 August 1983, 科学技术文献出版社 * |
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Application publication date: 20200421 |