CN111235352B - Method and system for preparing vanadium-rich slag and low-vanadium alloy from low-vanadium alloy and AOD (argon oxygen decarburization) duplex - Google Patents
Method and system for preparing vanadium-rich slag and low-vanadium alloy from low-vanadium alloy and AOD (argon oxygen decarburization) duplex Download PDFInfo
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C35/00—Master alloys for iron or steel
- C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C21C2007/0093—Duplex process; Two stage processes
Abstract
The invention belongs to the field of metal smelting, and relates to a low-vanadium alloy, and a method and a system for preparing vanadium-rich slag and low-vanadium alloy by adopting AOD duplex. The method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex comprises the following steps: (1) adding molten iron into a first AOD furnace, blowing oxygen at the top, introducing inert gas at the bottom, and adding vanadium-containing ore for blowing; (2) stopping oxygen blowing after the blowing is finished, and separating vanadium-rich slag; (3) pouring molten iron into a second AOD furnace, adding a slagging material, blowing oxygen from the top, and blowing mixed gas of inert gas and oxygen from the side; (4) continuously blowing oxygen at the top, blowing inert gas only at the side part, and blowing the inert gas at the bottom; (5) and stopping oxygen blowing after blowing is finished, and tapping. According to the invention, vanadium is enriched into slag through two AOD furnace refining, and vanadium-enriched slag which can be sold and low-vanadium alloy with reasonable carbon and phosphorus content are finally obtained, so that resources are effectively utilized.
Description
Technical Field
The invention belongs to the field of metal smelting, and relates to a low-vanadium alloy, and a method and a system for preparing vanadium-rich slag and low-vanadium alloy by adopting AOD duplex.
Background
Vanadium can refine the structure and crystal grains of steel, improve the hardness and wear resistance of steel, improve the tensile strength, heat resistance and the like, and is widely applied to the steel industry.
The vanadium titano-magnetite isThe main mineral resource of vanadium, at present most of vanadium is obtained from the vanadium. During the steel-making process of the vanadium titano-magnetite, a large amount of steel slag is generated, wherein about 1 to 4 percent of V is still contained2O5Have not been effectively utilized.
Vanadium in the steel slag can be reduced into molten iron by carbon-thermal fire smelting in a submerged arc furnace to obtain vanadium-containing pig iron. However, the vanadium content in the pig iron is still very low, the carbon and phosphorus content is high, and the pig iron cannot be directly used for downstream steel users and needs to be treated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly aims to provide a low-vanadium alloy, and a method and a system for preparing vanadium-rich slag and low-vanadium alloy by adopting AOD duplex.
Specifically, the method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex comprises the following steps: (1) adding molten iron into a first AOD furnace, blowing oxygen at the top, introducing inert gas at the bottom, and adding vanadium-containing ore for blowing; (2) stopping oxygen blowing after the blowing is finished, and separating vanadium-rich slag; (3) pouring molten iron into a second AOD furnace, adding a slagging material, blowing oxygen from the top, and blowing mixed gas of inert gas and oxygen from the side; (4) continuously blowing oxygen at the top, blowing inert gas only at the side part, and blowing the inert gas at the bottom; (5) and stopping oxygen blowing after converting is finished, and tapping to obtain the low-vanadium alloy and the steel slag.
According to the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, in the step (1), the molten iron is prepared by carrying out carbothermic reduction smelting on the vanadium-poor steel slag and the vanadium-titanium magnetite by using an ore furnace.
According to the method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, when the first AOD furnace is used for blowing, the pressure of oxygen during top oxygen blowing is 0.6-0.7 MPa, and the oxygen flow is
The pressure of the inert gas is 0.2-0.3 MPa, and the flow rate of the inert gas is
AOD duplex system as described aboveThe method for taking vanadium-rich slag and low-vanadium alloy comprises the following steps (2): stopping oxygen blowing after the blowing is finished, continuously blowing the inert gas for 10-30 s, adjusting the pressure of the inert gas to 0.05-0.1 MPa, and adjusting the flow to
According to the method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, the slagging material is lime.
In the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, in the step (3), the pressure of oxygen during top oxygen blowing is 0.6-0.7 MPa, and the flow rate is
When the mixed gas of inert gas and oxygen is blown into the side part, the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is
According to the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, the volume ratio of the inert gas to the oxygen in the mixed gas is (1:5) - (1: 2).
In the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, in the step (4), when only inert gas is blown into the side part, the pressure of the inert gas is 0.05-0.1 MPa, and the flow rate is 0.05-0.1 MPa
When inert gas is blown into the bottom, the pressure of the inert gas is 0.2-0.3 MPa, and the flow rate is
The method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex comprises the following steps of (5): stopping oxygen blowing after the blowing is finished, keeping parameters of the inert gas blown into the side part unchanged all the time, continuously blowing the inert gas blown into the bottom part for 10-30 s, adjusting the pressure to be 0.05-0.1 MPa, and adjusting the flow to be 0.05-0.1 MPa
According to the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, the inert gas is argon or nitrogen.
According to the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, the vanadium-rich slag comprises the following components in percentage by weight: SiO 22 29.86％～35.64％、CaO 0～11.45％、V2O5 10.18％～18.87％、FeO 27.39％～44.16％。
According to the method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, the vanadium-containing ore is vanadium-titanium magnetite lump ore or sinter.
According to the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy, the alkalinity of the steel slag is 2.5-3.5.
On the other hand, the invention provides a low-vanadium alloy which is prepared by the method for preparing vanadium-rich slag and the low-vanadium alloy by AOD duplex, wherein the low-vanadium alloy comprises the following components in parts by weight: fe 96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%.
In another aspect, the invention provides a system for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, which comprises a submerged arc furnace, a first AOD furnace and a second AOD furnace which are connected in sequence.
The technical scheme of the invention has the following beneficial effects:
(1) the method for preparing the vanadium-rich slag and the low-vanadium alloy by AOD duplex has the advantages of simple process equipment, convenient operation, strong raw material adaptability, low production cost, good application prospect and popularization significance;
(2) according to the AOD duplex vanadium-rich slag and low-vanadium alloy preparation method, vanadium is enriched into slag through two AOD furnace refining, and finally, vanadium-rich slag which can be sold and a low-vanadium alloy with reasonable carbon and phosphorus content are obtained, so that resources are effectively utilized;
(3) the low-vanadium alloy has moderate vanadium content and low carbon and phosphorus content, and the ingot can be directly used for downstream steel users after being finished;
(4) the system for preparing the vanadium-rich slag and the low-vanadium alloy by AOD duplex has simple equipment, is easy to manage and is suitable for popularization and application.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a process flow chart of the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "first," "second," and the like, as used herein do not denote any order or importance, but rather are used to distinguish one element from another. The terms "the," "said," "an," and "an" do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The term "connected" is to be understood broadly, for example, as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, all ranges disclosed herein are inclusive of the endpoints and independently combinable.
Specifically, in one aspect, the present invention provides a method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, as shown in fig. 1, including: (1) adding molten iron into a first AOD furnace, blowing oxygen at the top, introducing inert gas at the bottom, and adding vanadium-containing ore for blowing; (2) stopping oxygen blowing after the blowing is finished, and separating vanadium-rich slag; (3) pouring molten iron into a second AOD furnace, adding a slagging material, blowing oxygen from the top, and blowing mixed gas of inert gas and oxygen from the side; (4) continuously blowing oxygen at the top, blowing inert gas only at the side part, and blowing the inert gas at the bottom; (5) and stopping oxygen blowing after converting is finished, and tapping to obtain the low-vanadium alloy and the steel slag.
Among them, the AOD furnace is also called AOD refining furnace.
According to the method for preparing the vanadium-rich slag and the low-vanadium alloy by AOD duplex, the vanadium-rich slag and the low-vanadium alloy meeting the standard requirement are finally obtained by two AOD furnace refining, the process equipment is simple, the operation is convenient, and the production cost is reduced. Therefore, the method for preparing the vanadium-rich slag and the low-vanadium alloy by AOD duplex has good application prospect and popularization significance.
In some preferred embodiments, the AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy comprises the following steps.
(1) And adding molten iron into the first AOD furnace, blowing oxygen at the top, introducing inert gas at the bottom, and adding vanadium-containing ore for blowing.
In the step (1), the molten iron is prepared by carrying out carbothermic reduction smelting on the vanadium-poor steel slag and the vanadium-titanium magnetite by an ore furnace.
Wherein the inert gas is argon or nitrogen.
Wherein the vanadium-containing ore is vanadium-titanium magnetite lump ore or sinter.
Preferably, the addition amount of the vanadium-containing ore is less than 5% of the charging amount of the molten iron. The vanadium-containing ore is used as a coolant, vanadium extraction and carbon preservation are realized by adjusting the temperature of molten iron, and vanadium is enriched into slag.
Preferably, when the first AOD furnace is used for blowing, the pressure of oxygen during top oxygen blowing is 0.6-0.7 MPa, and the oxygen flow is
The pressure of the inert gas is 0.2-0.3 MPa, and the flow rate of the inert gas is
Wherein the temperature is 1420-1455 ℃ when converting in the first AOD furnace.
Carrying out primary refining on the molten iron in a first AOD furnace, wherein the primary refining mainly carries out oxidation reaction of vanadium, and the vanadium in the molten iron is oxidized into slag to obtain vanadium-rich slag; at the same time, a small carbon loss, i.e. oxidation of the carbon, also occurs.
(2) And stopping oxygen blowing after the blowing is finished, and separating the vanadium-rich slag.
And (2) continuing the blowing in the step (1) for 6-12min to reach the blowing end point.
Preferably, after blowing is finished, stopping oxygen blowing, continuously blowing inert gas for 10-30 s according to the parameters in the step (1), adjusting the pressure of the inert gas to 0.05-0.1 MPa, and adjusting the flow rate to
And then pouring the molten iron in the AOD furnace into a ladle, and scraping the vanadium-rich slag to a vanadium slag special disc.
In the present invention, after the blowing is finished and the oxygen blowing is stopped, the inert gas is continuously blown in according to the parameters of the step (1) for a certain period of time, and then the pressure and flow rate of the inert gas are reduced, whereby the clogging of the blowing lance can be prevented.
Wherein the vanadium-rich slag comprises the following components in percentage by weight: SiO 22 29.86％～35.64％、CaO0～11.45％、V2O5 10.18％～18.87％、FeO 27.39％～44.16％。
The vanadium-rich slag can be used for preparing vanadium sheets by a wet process consisting of the working procedures of salt roasting, leaching, vanadium precipitation, melting and the like, or can be used for preparing various vanadium-containing alloys by a pyrogenic process.
(3) And pouring molten iron into the second AOD furnace, adding a slagging material, blowing oxygen from the top, and blowing mixed gas of inert gas and oxygen from the side.
Wherein, the slagging material is lime, optionally, a small amount of dolomite, fluorite and the like can also be added. The lime is mainly used for producing high-alkalinity slag and P formed by oxidizing the slag with phosphorus in molten iron2O5Stably bonded 4 CaO. P2O5Is stabilized in the slag to achieve phosphorus removal while also removing some sulfur.
Among them, fluorite is an optional slag-forming material, and its main function is to lower the melting point of slag components to promote the rapid formation of slag.
Wherein the inert gas is argon or nitrogen.
Preferably, the pressure of oxygen during top oxygen blowing is 0.6-0.7 MPa, and the flow rate is
When the mixed gas of inert gas and oxygen is blown into the side part, the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is
Preferably, the volume ratio of the inert gas to the oxygen in the mixed gas is (1:5) to (1: 2).
Preferably, the time period for blowing the mixed gas into the side part is 6-9 min.
When smelting is carried out in the second AOD furnace, mixed gas is blown into the side part for 6-9min, so that stirring of a molten pool is accelerated, the dynamic conditions of oxidation reactions of carbon, phosphorus and the like are improved, the mass transfer and heat transfer processes are strengthened, dissolution of lime and formation of foam slag are accelerated, and the aims of decarburization and dephosphorization are fulfilled.
(4) Oxygen blowing is continued at the top, and only inert gas is blown into the side while inert gas is blown into the bottom.
Wherein, during the blowing of the second AOD furnace, after the mixed gas is blown for 6-9min, only the inert gas is blown in the side direction, the pressure of the inert gas is 0.05-0.1 MPa, and the flow rate is 0.05-0.1 MPa
Wherein when inert gas is blown into the bottom, the pressure of the inert gas is 0.2-0.3 MPa, and the flow rate is
Blowing inert gas into the bottom of the furnace mainly for homogenizing the components and temperature of the molten steel and simultaneously removingAnd (4) inclusion, and finishing end point control.
In the invention, the molten iron is further refined in the second AOD furnace, so that decarburization, dephosphorization, desulfurization and inclusion removal can be realized, and the molten iron meets the requirements of low-vanadium alloy.
(5) And stopping oxygen blowing after converting is finished, and tapping to obtain the low-vanadium alloy and the steel slag.
Preferably, after the blowing is finished, the oxygen blowing is stopped, the parameters of the inert gas blown into the side part are kept unchanged, the inert gas blown into the bottom part is continuously blown for 10 to 30s, the pressure is adjusted to be 0.05 to 0.1MPa, and the flow rate is adjusted to be 0.05 to 0.1MPa
Wherein the alkalinity of the steel slag is 2.5-3.5.
Wherein the low vanadium alloy comprises: fe 96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%.
Preferably, the inert gas is argon or nitrogen.
In some more preferred embodiments, the AOD duplex vanadium-rich slag and low-vanadium alloy production method of the present invention comprises the following steps:
(1) the vanadium-containing molten iron produced by the submerged arc furnace is hot-blended into the first AOD furnace, 0.6-0.7 MPa of air is blown into the top of the furnace,
The vanadium is extracted by oxygen, and 0.2-0.3 MPa of oxygen is introduced into the bottom of the vanadium extraction device,
Adding vanadium-containing ore with the iron melt loading amount not more than 5% as a coolant, extracting vanadium and preserving carbon by adjusting the temperature, and enriching the vanadium into slag;
(2) after the blowing is finished for 6-12min, lifting the oxygen lance to close the oxygen, continuously blowing argon (or nitrogen) for 10-30 seconds, adjusting the pressure of the argon (or nitrogen) to 0.05-0.1 MPa,
Pouring the vanadium-rich slag into a ladle, and removing the vanadium-rich slag;
(3) pouring the molten iron into a second AOD furnace, adding lime for slagging, continuously blowing oxygen at the top for 12-18min, wherein the oxygen pressure is 0.6-0.7 MPa, and the flow is
Meanwhile, the mixed gas of argon (or nitrogen) and oxygen is blown at the side part for 6-9min, wherein the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is
Then changing the side blowing gas into argon (or nitrogen) gas, wherein the pressure is 0.05-0.1 MPa, and the flow rate is
Simultaneously bottom blowing argon (or nitrogen) gas with the pressure of 0.2-0.3 MPa and the flow rate of
Stirring the molten pool to remove carbon and phosphorus to a reasonable range;
(4) after the blowing is finished, lifting the oxygen lance to close oxygen, keeping side blowing parameters unchanged, continuously blowing argon (or nitrogen) at the bottom for 10-30 seconds, adjusting the argon (or nitrogen) to 0.05-0.1 MPa,
Then pouring into a foundry ladle to obtain the low-vanadium alloy and the steel slag.
The invention relates to a process for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, which comprises the steps of hot-blending vanadium-containing molten iron produced by a submerged arc furnace into an AOD furnace, carrying out top-blown oxygen vanadium extraction, simultaneously introducing inert gas with a certain flow rate into the bottom of the AOD furnace, adding a coolant to adjust the temperature so as to extract vanadium and preserve carbon, and enriching vanadium into slag. And then pouring the molten iron into another AOD furnace, adding lime for slagging, and removing carbon and phosphorus to a reasonable range through a stirring molten pool of top-blown oxygen, side-blown mixed gas and bottom-blown inert gas to obtain the low-vanadium alloy. The AOD duplex preparation method of the vanadium-rich slag and the low-vanadium alloy has the advantages of short process flow, few working procedures, simple equipment, easy management, low operation cost, good application value and popularization significance.
On the other hand, the invention provides a low-vanadium alloy which is prepared by the method for preparing vanadium-rich slag and the low-vanadium alloy by AOD duplex. The low vanadium alloy comprises, in weight percent: fe 96.91-97.02%, C0.85-0.93%, V0.06-0.20%, P0.01-0.04%.
The low-vanadium alloy has moderate vanadium content and low carbon and phosphorus content, and the ingot can be directly used for downstream steel users after being finished.
In another aspect, the invention provides a system for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex, which comprises a submerged arc furnace, a first AOD furnace and a second AOD furnace which are connected in sequence.
Preferably, the AOD duplex vanadium-rich slag and low-vanadium alloy preparation system further comprises a foundry ladle, an oxygen lance, a storage bin, a bottom blowing lance and other equipment. The apparatus described above is connected to a submerged arc furnace, a first AOD furnace and a second AOD furnace in a manner known in the art, and the invention is not specifically limited herein.
The system for preparing the vanadium-rich slag and the low-vanadium alloy by AOD duplex has simple equipment, is easy to manage and is suitable for popularization and application.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions. The starting materials used in the following examples are all conventionally commercially available.
Example 1
Pouring vanadium-containing molten iron produced by a certain submerged arc furnace into an AOD furnace, after 4.5 percent of vanadium sinter (formed by sintering vanadium-containing steel slag, vanadium powder ore, dedusting ash and the like), carrying out top-blown oxygen (0.6MPa,
) While bottom blowing nitrogen (0.25MPa,
) And enriching vanadium into slag. After blowing for 8min, lifting the oxygen lance to close oxygen, continuously blowing nitrogen for 15s, adjusting the nitrogen to 0.08MPa,
Pouring into a ladle, and raking the slag into a slag pan, wherein the vanadium-rich slag comprises SiO2 35.11％，CaO 8.93％，V2O5 13.43％，FeO 30.76％。
Then pouring the molten iron into another AOD furnace, adding lime for slagging, continuously blowing oxygen at the top for 12min (0.6MPa,
) At the same time, the mixed gas of nitrogen and oxygen is blown into the side part for 6.5min (0.6MPa,
wherein the nitrogen-oxygen ratio is 1/5), then the side-blown gas is changed into nitrogen (0.08MPa,
) At the same time, bottom blowing of nitrogen (0.25MPa,
) And stirring the molten pool to remove carbon and phosphorus to a reasonable range. After the blowing is finished, the oxygen lance is lifted to close oxygen, side blowing parameters are kept unchanged (nitrogen blowing, 0.08MPa,
) After the bottom is continuously blown with nitrogen for 15s, the nitrogen is adjusted to 0.08MPa,
Then pouring into a ladle to obtain the low-vanadium alloy and the steel slag. The low-vanadium alloy comprises Fe 96.94%, C0.88%, V0.12%, P0.02% and steel slag with alkalinity of 2.8.
Example 2
The vanadium-containing molten iron produced by a certain submerged arc furnace is poured into an AOD furnace, after 4 percent of vanadium-titanium magnetite lump ore is added, top-blown oxygen (0.65MPa,
) While bottom blowing nitrogen (0.2MPa,
) And enriching vanadium into slag. After blowing for 10min, lifting the oxygen lance to close oxygen, continuously blowing nitrogen for 15s, adjusting the nitrogen to 0.05MPa,
Pouring into a ladle, and raking the slag into a slag pan, wherein the vanadium-rich slag comprises SiO2 33.11％，CaO 0.09％，V2O514.69％，FeO 39.46％。
Then pouring the molten iron into another AOD furnace, adding lime for slagging, continuously blowing oxygen at the top for 12min (0.65MPa,
) At the same time, the mixed gas of nitrogen and oxygen is blown into the side part for 8min (0.65MPa,
wherein the nitrogen-oxygen ratio is 1/3), then the side-blown gas is changed into nitrogen (0.05MPa,
) At the same time, bottom blowing of nitrogen (0.25MPa,
) And stirring the molten pool to remove carbon and phosphorus to a reasonable range. After the blowing is finished, the oxygen lance is lifted to close oxygen, side blowing parameters are kept unchanged (nitrogen blowing is carried out under 0.05MPa,
) After the bottom is continuously blown with nitrogen for 15s, the nitrogen is adjusted to 0.05MPa,
Then pouring into a ladle to obtain the low-vanadium alloy and the steel slag. The low-vanadium alloy comprises 96.93 percent of Fe, 0.89 percent of C, 0.13 percent of V, 0.03 percent of P and 3 percent of steel slag alkalinity.
Example 3
Pouring vanadium-containing molten iron produced by a certain submerged arc furnace into an AOD furnace, after 2.5 percent of vanadium-titanium magnetite lump ore and 2.5 percent of vanadium sinter ore (formed by sintering vanadium-containing steel slag, vanadium powder ore, dedusting ash and the like), carrying out top blowing oxygen (0.6MPa,
) While bottom blowing argon (0.3MPa,
) And enriching vanadium into slag. After blowing for 8min, lifting the oxygen lance to close oxygen, continuously blowing argon for 10s, adjusting the pressure of the argon to 0.1MPa,
Pouring into a ladle, and raking the slag into a slag pan, wherein the vanadium-rich slag comprises SiO2 32.82％，CaO 4.78％，V2O5 13.41％，FeO 37.01％。
Then pouring the molten iron into another AOD furnace, adding lime for slagging, continuously blowing oxygen at the top for 14min (0.6MPa,
) At the same time, the mixed gas of argon and oxygen is blown into the side part for 9min (0.6MPa,
wherein the argon-oxygen ratio is 1/4), then the side-blown gas is changed to argon (0.1MPa,
) Simultaneously, bottom blowing argon (0.2MPa,
) And stirring the molten pool to remove carbon and phosphorus to a reasonable range. After the blowing is finished, the oxygen lance is lifted to close oxygen, side blowing parameters are kept unchanged (argon blowing, 0.1MPa,
) After the bottom is continuously blown with argon for 10s, the argon is adjusted to 0.1MPa,
Then pouring into a ladle to obtain the low-vanadium alloy and the steel slag. The low-vanadium alloy comprises 96.93 percent of Fe, 0.89 percent of C, 0.12 percent of V, 0.02 percent of P and 3.2 percent of steel slag alkalinity.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (2)
1. A method for preparing vanadium-rich slag and low-vanadium alloy by AOD duplex is characterized by comprising the following steps:
(1) adding molten iron into a first AOD furnace, blowing oxygen from the top, wherein the oxygen pressure is 0.6-0.7 MPa, and the oxygen flow is
Introducing inert gas into the bottom, wherein the pressure of the inert gas is 0.2-0.3 MPa, and the flow rate of the inert gas is
Simultaneously adding vanadium-containing ore for blowing;
(2) stopping blowing oxygen after blowing for 6-12min, continuously blowing inert gas for 10-30 s, adjusting the pressure of the inert gas to 0.05-0.1 MPa, and adjusting the flow to
Separating vanadium-rich slag;
(3) pouring molten iron into a second AOD furnace, adding a slagging material, continuously blowing oxygen at the top for 12-18min, wherein the pressure of the oxygen is 0.6-0.7 MPa, and the flow rate is
Meanwhile, firstly, blowing a mixed gas of inert gas and oxygen for 6-9min at the side part, wherein the pressure of the mixed gas is 0.6-0.7 MPa, and the flow rate is
(4) Then only blowing inert gas into the side part, wherein the pressure of the inert gas is 0.05-0.1 MPa, and the flow rate is
Simultaneously blowing inert gas into the bottom, wherein the pressure of the inert gas is 0.2-0.3 MPa, and the flow rate is
(5) Stopping oxygen blowing after the blowing is finished, keeping parameters of the inert gas blown into the side part unchanged all the time, continuously blowing the inert gas blown into the bottom part for 10-30 s, adjusting the pressure to be 0.05-0.1 MPa, and adjusting the flow to be 0.05-0.1 MPa
Tapping to obtain the low-vanadium alloy and the steel slag.
2. The AOD duplex method for preparing vanadium-rich slag and low-vanadium alloy according to claim 1, wherein the alkalinity of the steel slag is 2.5-3.5.
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