CN111961803A - Production process and method of industrial pure iron - Google Patents
Production process and method of industrial pure iron Download PDFInfo
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- CN111961803A CN111961803A CN202010936628.8A CN202010936628A CN111961803A CN 111961803 A CN111961803 A CN 111961803A CN 202010936628 A CN202010936628 A CN 202010936628A CN 111961803 A CN111961803 A CN 111961803A
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- Prior art keywords
- molten steel
- vanadium
- pure iron
- industrial pure
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5264—Manufacture of alloyed steels including ferro-alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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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
- C21C7/10—Handling in a vacuum
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- 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
Abstract
The invention belongs to the technical field of metallurgy, and relates to a production process and a method of industrial pure iron. The vanadium-titanium metallized pellet is heated and melted in an electric furnace smelting device, vanadium slag and molten melting steel are obtained by controlling the melting process, and then decarburization and heating of the molten melting steel are realized by slagging smelting, so that high-purity molten steel is obtained; the high-purity molten steel is desulfurized and vacuum decarbonized in a refining device outside the furnace, and the qualified molten steel after refining is continuously cast and rolled into industrial pure iron in a molten steel forming device. The method has short process flow, realizes high value-added utilization of iron resources while smelting, separating and extracting vanadium in the electric furnace, has low investment in the whole process and low pollutant emission, and reduces the production cost of industrial pure iron.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production process and a method of industrial pure iron.
Background
The industrial pure iron is an important iron and steel base material, is an iron alloy with very low carbon content, and has the excellent performances of low coercive force, good heat conduction and electromagnetic properties, softness, high toughness and the like. The iron is mainly divided into three types, namely electromagnetic pure iron, raw material pure iron, military pure iron and the like according to the application.
The industrial pure iron is produced by adopting the traditional converter process comprising molten iron pretreatment, converter steelmaking, LF, RH vacuum treatment and continuous casting, and the purity of molten steel can meet the production requirement of the industrial pure iron. However, the process takes molten iron as a raw material, the process flow is long, and the molten iron production energy consumption is high and is not environment-friendly.
Disclosure of Invention
In view of the above, the invention aims to provide a process and a method for producing industrial pure iron, the process flow is short, high value-added utilization of iron resources is realized while vanadium is extracted by smelting and separating in an electric furnace, the investment of the whole process is low, the pollutant emission is low, and the production cost of the industrial pure iron is reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a production process of industrial pure iron comprises the following steps:
s1: the direct reduction takes vanadium-titanium-iron ore concentrate, a binder and a reducing agent as raw materials, vanadium-titanium metallized pellets are obtained through selective reduction, and the vanadium-titanium metallized pellets are thermally sent to an electric furnace smelting workshop;
s2: the electric furnace smelting takes 100 percent vanadium-titanium metallized pellets as raw materials, and the smelting operation is divided into two stages of melting separation and decarburization heating; in the melting separation stage, the vanadium-titanium metallized pellets are heated and melted through electric arcs, the feeding speed, oxygen blowing and carbon spraying operations of the vanadium-titanium metallized pellets are controlled according to the heat balance condition and the input power in the furnace, and the vanadium slag and the molten steel are obtained after the vanadium-titanium metallized pellets are completely melted and discharged into a slag pot through a furnace door; in the decarburization heating stage, the decarburization heating of the molten steel is realized by continuously adding slag making materials, supplying power and blowing oxygen into the furnace, so that high-purity molten steel is obtained;
s3: the external refining uses high-purity molten steel as raw material, and qualified molten steel is obtained through refining desulfurization and vacuum decarburization;
s4: the molten steel forming method takes qualified molten steel as a raw material, and the molten steel is continuously cast and rolled into industrial pure iron.
Optionally, the selective reduction mode of direct reduction is a shaft furnace, a rotary hearth furnace, a tunnel kiln, a rotary kiln, or a multi-layer furnace.
Optionally, the metallized pellet has a metallization rate of more than 85% and a carbon content of not more than 2.0%.
Optionally, the alkalinity of the vanadium slag is 0.15-0.30, and the content of vanadium pentoxide in the slag is 4-8%.
Optionally, the content of C in the molten steel is not higher than 0.20%, the content of P is not higher than 0.01%, the content of S is not higher than 0.03%, and the content of Fe is not lower than 99.5%.
Optionally, the slagging material comprises lime, light burned material and fluorite.
Optionally, the content of C in the high-purity molten steel is not higher than 0.10%, the content of P in the high-purity molten steel is not higher than 0.005%, and the content of S in the high-purity molten steel is not higher than 0.03%.
Optionally, the smelting device for refining and desulfurizing can be a ladle refining furnace or a ladle argon blowing station or CAS-OB.
Optionally, the content of S in the refined and desulfurized molten steel is not higher than 0.005%.
Optionally, the smelting device for vacuum decarburization is RH or VOD.
Optionally, the content of C in the molten steel after vacuum decarburization is not higher than 0.01%.
Optionally, the chemical components and mass percentage content of the industrial pure iron are that C is less than 0.01%, P is less than or equal to 0.005%, S is less than or equal to 0.005%, and the balance is Fe and impurities.
A vanadium-titanium-iron ore concentrate, a binder and a reducing agent are selectively reduced in a direct reduction device to obtain vanadium-titanium metallized pellets, the vanadium-titanium metallized pellets are heated and melted in an electric furnace smelting device, vanadium slag and molten melting steel are obtained by controlling the melting process, and then decarburization and heating of the molten melting steel are realized by slagging smelting to obtain high-purity molten steel; the high-purity molten steel is desulfurized and vacuum decarbonized in a refining device outside the furnace, and the qualified molten steel after refining is continuously cast and rolled into industrial pure iron in a molten steel forming device.
The invention has the beneficial effects that:
the invention adopts vanadium-titanium-iron ore concentrate, a binder and a reducing agent as raw materials, selectively reduces the raw materials in a direct reduction device, carries out melting separation and decarburization heating on vanadium-titanium metallized pellets in an electric furnace smelting device, carries out refining desulfurization and vacuum decarburization in a refining device outside the furnace, and continuously casts and rolls the obtained qualified molten steel into industrial pure iron in a molten steel forming device. Compared with the conventional industrial pure iron production flow, the process has short production flow, realizes high value-added utilization of iron resources while smelting, separating and extracting vanadium in an electric furnace, has low investment in the whole process and low pollutant emission, and reduces the production cost of the industrial pure iron.
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, as shown in the figure, vanadium-titanium-iron ore concentrate, a binder and a reducing agent are selectively reduced in a direct reduction (1) device to obtain vanadium-titanium metallized pellets, wherein the vanadium-titanium metallized pellets have a metallization rate of more than 85% and a carbon content of not more than 2.0%; then the vanadium-titanium metallized pellets are thermally sent to an electric furnace steelmaking workshop, melting separation and decarburization heating treatment are carried out in an electric furnace smelting device, the vanadium-titanium metallized pellets are melted by electric arc heating in the melting separation stage, the feeding speed, oxygen blowing and carbon spraying operations of the vanadium-titanium metallized pellets are controlled according to the heat balance condition and input power in the furnace, and slag is discharged into a slag pot through a furnace door after being melted down to obtain vanadium slag and molten melting steel; the alkalinity of the vanadium slag is 0.15-0.30, and the content of vanadium pentoxide in the slag is 4-8%; the content of C in the molten steel is not higher than 0.20%, the content of P is not higher than 0.01%, the content of S is not higher than 0.03%, and the content of Fe is not lower than 99.5%. In the decarburization heating stage, the decarburization heating of the molten steel is realized by continuously adding slag making materials such as lime, light burning, fluorite and the like into the furnace, supplying power and blowing oxygen, so as to obtain high-purity molten steel; the content of C in the high-purity molten steel is not higher than 0.10%, the content of P is not higher than 0.005%, and the content of S is not higher than 0.03%. Then, refining, desulfurizing and vacuum decarbonizing the high-purity molten steel to obtain qualified molten steel with the C content of not higher than 0.01 percent, the P content of not higher than 0.005 percent and the S content of not higher than 0.005 percent; the qualified molten steel is made into industrial pure iron by a molten steel forming device such as continuous casting and rolling.
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. The production process of the industrial pure iron is characterized by comprising the following steps:
s1: the direct reduction takes vanadium-titanium-iron ore concentrate, a binder and a reducing agent as raw materials, vanadium-titanium metallized pellets are obtained through selective reduction, and the vanadium-titanium metallized pellets are thermally sent to an electric furnace smelting workshop;
s2: the electric furnace smelting takes 100 percent vanadium-titanium metallized pellets as raw materials, and the smelting operation is divided into two stages of melting separation and decarburization heating; in the melting separation stage, the vanadium-titanium metallized pellets are heated and melted through electric arcs, the feeding speed, oxygen blowing and carbon spraying operations of the vanadium-titanium metallized pellets are controlled according to the heat balance condition and the input power in the furnace, and the vanadium slag and the molten steel are obtained after the vanadium-titanium metallized pellets are completely melted and discharged into a slag pot through a furnace door; in the decarburization heating stage, the decarburization heating of the molten steel is realized by continuously adding slag making materials, supplying power and blowing oxygen into the furnace, so that high-purity molten steel is obtained;
s3: the external refining uses high-purity molten steel as raw material, and qualified molten steel is obtained through refining desulfurization and vacuum decarburization;
s4: the molten steel forming method takes qualified molten steel as a raw material, and the molten steel is continuously cast and rolled into industrial pure iron.
2. The process for producing industrially pure iron as claimed in claim 1, wherein the direct reduction is carried out in a selective reduction mode selected from the group consisting of shaft furnace, rotary hearth furnace, tunnel kiln, rotary kiln and multi-layer furnace.
3. The process for producing industrial pure iron according to claim 1, wherein the metallized pellets have a metallization degree of more than 85% and a carbon content of not more than 2.0%.
4. The process for producing industrial pure iron according to claim 1, wherein the molten steel contains not more than 0.20% of C, not more than 0.01% of P, not more than 0.03% of S, and not less than 99.5% of Fe.
5. The process for producing industrial pure iron according to claim 1, wherein the slagging material comprises lime, light burned, fluorite.
6. The process for producing industrially purified iron as claimed in claim 1, wherein the S content in the molten steel after refining and desulfurizing is not more than 0.005%.
7. The process for producing industrially purified iron as claimed in claim 1, wherein the vacuum decarburization melting device is RH or VOD.
8. The process for producing industrially purified iron as claimed in claim 1, wherein the C content in the molten steel after the vacuum decarburization is not higher than 0.01%.
9. The process for producing industrially purified iron as claimed in any of claims 1 to 8, wherein the industrially purified iron has a chemical composition and mass% of C < 0.01%, P < 0.005%, S < 0.005%, and the balance Fe and impurities.
10. A method for producing industrial pure iron is characterized in that vanadium-titanium iron ore concentrate, a binder and a reducing agent are subjected to selective reduction in a direct reduction device to obtain vanadium-titanium metallized pellets, the vanadium-titanium metallized pellets are heated and melted in an electric furnace smelting device, vanadium slag and molten melting steel are obtained by controlling the melting process, and then decarburization and temperature rise of the molten melting steel are realized through slagging smelting to obtain high-purity molten steel; the high-purity molten steel is desulfurized and vacuum decarbonized in a refining device outside the furnace, and the qualified molten steel after refining is continuously cast and rolled into industrial pure iron in a molten steel forming device.
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| CN202010936628.8A CN111961803A (en) | 2020-09-08 | 2020-09-08 | Production process and method of industrial pure iron |
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| CN202010936628.8A CN111961803A (en) | 2020-09-08 | 2020-09-08 | Production process and method of industrial pure iron |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115305310A (en) * | 2022-09-13 | 2022-11-08 | 江苏省沙钢钢铁研究院有限公司 | Method for using metallized pellets in electric arc furnace |
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