CN111500813A - Method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in electric furnace - Google Patents
Method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in electric furnace Download PDFInfo
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- CN111500813A CN111500813A CN202010327329.4A CN202010327329A CN111500813A CN 111500813 A CN111500813 A CN 111500813A CN 202010327329 A CN202010327329 A CN 202010327329A CN 111500813 A CN111500813 A CN 111500813A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/143—Injection of partially reduced ore into a molten bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
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Abstract
The invention belongs to the technical field of metallurgy, and relates to a method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets by an electric furnace, which comprises the following steps: melting and separating: heating and melting vanadium-titanium metallized pellet furnace charge to obtain high-purity molten iron and vanadium-rich slag; slag remaining and steel tapping: discharging high-purity molten iron into a steel ladle through a steel outlet, remaining vanadium-rich slag in the furnace after steel discharge, and finishing primary smelting; multi-furnace smelting: repeating the steps of melting separation and slag-remaining tapping until N times of smelting is finished; when the Nth furnace taps steel, the molten steel is not discharged completely, and the residual molten steel is in the furnace; adjusting slag: blowing a slag modifier into the vanadium-rich slag in the furnace; reduction smelting: and blowing a reducing agent to perform slag reduction operation to obtain vanadium-rich molten iron and final slag. The invention realizes the separation of iron and vanadium elements in the same electric furnace, realizes the high value-added utilization of the iron element and the enrichment of the vanadium element, has compact and flexible process and high vanadium recovery rate in the whole process.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets by an electric furnace.
Background
The current smelting of the vanadium-titanium metallized pellet by electric furnace adopts a deep reduction process, and the metallurgical principle of the smelting process is as follows: selectively reducing iron and vanadium oxides in the vanadium-titanium metallized pellets by a reducing agent in a melting electric furnace to enter molten iron, and enriching titanium oxides into slag, thereby obtaining vanadium-containing molten iron and titanium slag. The vanadium-containing molten iron is rich in iron and vanadium elements, and in order to realize effective utilization of iron and vanadium, the vanadium-containing molten iron is subjected to oxygen blowing operation in a converter or a foundry ladle or other equipment, vanadium is oxidized into slag through selective oxidation, and semisteel and vanadium slag are obtained; secondly, the semisteel is sent into a steelmaking converter to be smelted to form molten steel, and then steel products are produced through the working procedures of continuous casting, steel rolling and the like to realize the effective utilization of iron elements; and the vanadium slag needs to produce vanadium flakes by a sodium salt roasting or calcification roasting method so as to realize effective utilization of vanadium elements.
The process has long flow and large temperature loss in the process; and the iron and vanadium elements have certain loss after passing through each production process, and the element yield is not high.
Disclosure of Invention
In view of the above, the invention aims to provide a method for utilizing iron and vanadium resources in melting vanadium-titanium metallized pellets in an electric furnace, which realizes the separation of iron and vanadium elements in the same electric furnace, realizes the high value-added utilization of the iron element and the enrichment of the vanadium element, and has the advantages of compact and flexible process and high element recovery rate in the whole process.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in an electric furnace comprises the following steps:
melting and separating: heating and melting vanadium-titanium metallized pellet furnace charge to obtain high-purity molten iron and vanadium-rich slag;
slag remaining and steel tapping: discharging high-purity molten iron into a steel ladle through a steel outlet, remaining vanadium-rich slag in the furnace after steel discharge, and finishing primary smelting;
multi-furnace smelting: repeating the steps of melting separation and slag-remaining tapping until N times of smelting is finished; n times of vanadium-rich slag are arranged in the furnace; when the Nth furnace taps steel, the molten steel is not discharged completely, and the residual molten steel is in the furnace;
adjusting slag: blowing a slag modifier into the vanadium-rich slag in the furnace to ensure that the alkalinity of the slag is 1.0-1.3;
reduction smelting: after adding the slag modifier, heating and melting the slag modifier through an electrode, blowing a reducing agent to carry out slag reduction operation, and obtaining vanadium-rich molten iron and final slag after the operation is finished;
n is greater than or equal to 1.
Optionally, the vanadium-titanium metallized pellet is in a cold state or a hot state.
Optionally, the thermal vanadium-titanium metallized pellet is adopted, and the temperature is not lower than 400 ℃.
Optionally, the content of T.Fe in the vanadium-titanium metallized pellet is not less than 60.0%, the content of TiO2 is not more than 15.0%, the content of V2O5 is 0.5-1.2%, and the content of C is not more than 1.2%.
Optionally, in the step of "multi-furnace smelting", the residual molten steel amount is not more than 20% of the tapping amount.
Optionally, the slag modifier is lime powder and/or fluorite powder.
Optionally, the blowing amount of the slag modifier is 1/3 of the slag amount in the furnace.
Optionally, the reducing agent is a group formed by combining one or more of graphite powder, carbon powder and anthracite powder.
Optionally, the injection amount of the reducing agent is 1-5% of the slag amount in the furnace.
Optionally, the quality of the high-purity molten iron is improved through the processes of external refining, continuous casting and steel rolling.
Optionally, the melting down means that more than 90% of the furnace burden is melted.
Optionally, the content of C in the high-purity molten iron is not higher than 0.2%, and the high-purity molten iron contains trace Si, Mn, P and S.
Optionally, the content of V2O5 in the vanadium-rich slag is 4-8%.
Optionally, the content of V in the vanadium-rich molten iron is 8-15%, and the balance is mostly Fe.
The invention has the beneficial effects that:
the method takes vanadium-titanium-iron metallized pellets as raw materials, heats and melts furnace materials in an electric furnace through arc heat generated by electrifying electrodes, taps after melting down and leaves slag in the furnace, and gathers multi-furnace vanadium-rich slag in the furnace after multi-furnace smelting; and then, reducing vanadium in the vanadium-rich slag into molten iron through slag adjustment and reduction smelting to obtain vanadium-rich molten iron and tailings. The process has short production flow, is flexible and compact, and realizes the effective utilization of iron and vanadium resources in the pellet raw materials.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the invention relates to a method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in an electric furnace, which comprises the following steps of 1) melting and separating: loading the vanadium-titanium metallized pellets into an electric furnace, heating and melting vanadium-titanium metallized pellet furnace burden after an electrode is electrified; 2) slag remaining and steel tapping: after the vanadium-titanium metallized pellets are melted down, high-purity molten iron and vanadium-rich slag are obtained, wherein the high-purity molten iron is discharged into a steel ladle through a steel outlet, the residual vanadium-rich slag is left in a furnace after the steel is discharged, and the primary smelting is finished; 3) multi-furnace smelting: repeating the steps of melting separation and slag remaining tapping until N-time smelting is finished, wherein N-time vanadium-rich slag exists in the furnace; when the Nth furnace taps steel, the molten steel is not discharged completely, and the residual molten steel is in the furnace; 4) adjusting slag: then, blowing a slag modifier into the vanadium-rich slag in the furnace through an auxiliary material spray gun to ensure that the alkalinity of the slag is 1.0-1.3; 5) reduction smelting: after the slag modifier is added, the slag modifier is heated and melted by an electrode, and meanwhile, a reducing agent is sprayed by a reducing agent spray gun to carry out slag reduction operation, so that vanadium-rich molten iron and tailings are obtained after the reduction smelting is finished.
In this embodiment, the vanadium-titanium metallized pellet may be in a cold state or a hot state. If the thermal vanadium-titanium metallized pellet is adopted, the temperature is not lower than 400 ℃. The vanadium-titanium metallized pellet has the T.Fe content of not less than 60.0%, the TiO2 content of not more than 15.0%, the V2O5 content of 0.5-1.2% and the C content of not more than 1.2%. The molten down means that more than 90% of furnace burden is melted in the electric furnace. The content of C in the high-purity molten iron is not higher than 0.2%, and the contents of Si, Mn, P and S are trace. The high-purity molten iron can be used for producing high-quality pure iron through the working procedures of external refining, continuous casting, steel rolling and the like. The content of V2O5 in the vanadium-rich slag is 4-8%. Smelting in the N furnaces, wherein N is more than or equal to 1 furnace. The residual part of the molten steel, where the amount of residual molten steel is not more than 20% of the tapped amount. The slag modifier includes, but is not limited to, lime powder, fluorite powder, etc. The blowing amount of the slag modifier is about 1/3 of the slag amount in the furnace. The reducing agent includes, but is not limited to, graphite powder, carbon powder, anthracite powder, and the like. The blowing amount of the reducing agent is about 1-5% of the slag amount in the furnace. The V content of the vanadium-rich molten iron is 8-15%, and the balance is mostly Fe.
In the step of melting and separating, the vanadium-titanium metallized pellets are put into an electric furnace, and the electrodes are heated and melted after being electrified; after melting down, entering a step of slag retention and tapping, discharging high-purity molten iron obtained by melting down into a steel ladle through a tapping hole, and after steel is discharged, remaining vanadium-rich slag in the furnace; then repeating the melting and separating step and the steel remaining and slag tapping step in the multi-furnace melting step until the N-furnace melting is finished; then, a slag adjusting step is carried out, and a slag modifier is sprayed into the vanadium-rich slag in the furnace through an auxiliary material spray gun arranged on the furnace wall or the furnace door, so that the alkalinity of the slag is ensured to be 1.0-1.3; and finally, in the reduction smelting step, heating and melting through an electrode, blowing a reducing agent through a reducing agent spray gun arranged on a furnace wall or a furnace door to perform slag reduction operation, and obtaining vanadium-rich molten iron and final slag after the reduction smelting is finished.
The method takes vanadium-titanium-iron metallized pellets as raw materials, heats and melts furnace materials in an electric furnace through arc heat generated by electrifying electrodes, taps after melting down and leaves slag in the furnace, and gathers multi-furnace vanadium-rich slag in the furnace after multi-furnace smelting; and then, reducing vanadium in the vanadium-rich slag into molten iron through slag adjustment and reduction smelting to obtain vanadium-rich molten iron and tailings. The process has short production flow, is flexible and compact, and realizes the effective utilization of iron and vanadium resources in the pellet raw materials.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in an electric furnace is characterized by comprising the following steps:
melting and separating: heating and melting vanadium-titanium metallized pellet furnace charge to obtain high-purity molten iron and vanadium-rich slag;
slag remaining and steel tapping: discharging high-purity molten iron into a steel ladle through a steel outlet, remaining vanadium-rich slag in the furnace after steel discharge, and finishing primary smelting;
multi-furnace smelting: repeating the steps of melting separation and slag-remaining tapping until N times of smelting is finished; n times of vanadium-rich slag are arranged in the furnace; when the Nth furnace taps steel, the molten steel is not discharged completely, and the residual molten steel is in the furnace;
adjusting slag: blowing a slag modifier into the vanadium-rich slag in the furnace to ensure that the alkalinity of the slag is 1.0-1.3;
reduction smelting: after adding the slag modifier, heating and melting the slag modifier through an electrode, blowing a reducing agent to carry out slag reduction operation, and obtaining vanadium-rich molten iron and final slag after the operation is finished;
n is greater than or equal to 1.
2. The method for utilizing ferrovanadium resources by melting and separating vanadium-titanium metallized pellets in an electric furnace as claimed in claim 1, wherein the vanadium-titanium metallized pellets are in a cold state or a hot state.
3. The method for utilizing ferrovanadium resources by melting vanadium-titanium metallized pellets in an electric furnace as claimed in claim 2, characterized in that the hot vanadium-titanium metallized pellets are used, and the temperature is not lower than 400 ℃.
4. The method for utilizing iron and vanadium resources by melting and separating vanadium-titanium metallized pellets in an electric furnace as claimed in claim 1, wherein the vanadium-titanium metallized pellets have a T.Fe content of not less than 60.0%, a TiO2 content of not more than 15.0%, a V2O5 content of 0.5-1.2%, and a C content of not more than 1.2%.
5. The method for utilizing ferrovanadium resources of the electric furnace melt-separated vanadium-titanium metallized pellets as claimed in claim 1, wherein in the "multi-furnace melting" step, the amount of residual molten steel is not more than 20% of the amount of tapped steel.
6. The method for utilizing iron and vanadium resources for the electric furnace melt separation of vanadium-titanium metallized pellets as claimed in claim 1, characterized in that the slag modifier is lime powder and/or fluorite powder.
7. The method for utilizing ferrovanadium resources by melting vanadium-titanium metallized pellets in an electric furnace as claimed in claim 1 or 6, wherein the amount of the slag modifier is 1/3 of the amount of the slag in the furnace.
8. The method for utilizing iron and vanadium resources for melting and separating vanadium-titanium metallized pellets by an electric furnace as claimed in claim 1, wherein the reducing agent is a group formed by one or a combination of several of graphite powder, carbon powder and anthracite powder.
9. The method for utilizing iron and vanadium resources by melting and separating vanadium-titanium metallized pellets by an electric furnace as claimed in claim 1 or 8, characterized in that the injection amount of the reducing agent is 1% -5% of the amount of the slag in the furnace.
10. The method for utilizing ferrovanadium resources for the electric furnace melt separation of vanadium-titanium metallized pellets as claimed in claim 1, wherein the high purity molten iron is subjected to the processes of external refining, continuous casting and steel rolling to improve the quality.
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| CN202010327329.4A CN111500813B (en) | 2020-04-23 | 2020-04-23 | Method for utilizing iron and vanadium resources by melting vanadium-titanium metallized pellets in electric furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961803A (en) * | 2020-09-08 | 2020-11-20 | 中冶赛迪工程技术股份有限公司 | Production process and method of industrial pure iron |
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- 2020-04-23 CN CN202010327329.4A patent/CN111500813B/en active Active
Patent Citations (3)
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| KR20000028852A (en) * | 1998-10-05 | 2000-05-25 | 에모토 간지 | Method for slag coating of converter wall |
| CN101906498A (en) * | 2010-08-25 | 2010-12-08 | 武钢集团昆明钢铁股份有限公司 | Method for comprehensively smelting sefstromite |
| CN105087961A (en) * | 2015-08-10 | 2015-11-25 | 中冶南方工程技术有限公司 | Method for efficiently recycling vanadium, iron and titanium in vanadium-titanium metallized pellet through electric arc furnace |
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| CN111961803A (en) * | 2020-09-08 | 2020-11-20 | 中冶赛迪工程技术股份有限公司 | Production process and method of industrial pure iron |
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