CN116162763A - LF smelting process for slag formation by utilizing RH cold steel - Google Patents
LF smelting process for slag formation by utilizing RH cold steel Download PDFInfo
- Publication number
- CN116162763A CN116162763A CN202310204086.9A CN202310204086A CN116162763A CN 116162763 A CN116162763 A CN 116162763A CN 202310204086 A CN202310204086 A CN 202310204086A CN 116162763 A CN116162763 A CN 116162763A
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- Prior art keywords
- slag
- cold steel
- steel
- cold
- furnace
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Classifications
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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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- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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 ferrous metallurgy, and particularly relates to an LF smelting process utilizing RH cold steel slag formation, which comprises the steps of collecting and crushing RH cold steel, adding 100-140kg of RH cold steel fragments into a furnace by using a chute in the early stage of LF smelting, and melting the cold steel in the heating process, wherein Al contained in the cold steel 2 O 3 Into slag, regulating CaO-SiO in slag system 2 ‑Al 2 O 3 In a low melting point region, while about 60% of the metal oxides contained in the RH cold steel are reduced by aluminum, and also some alumina is formed into the slag; the metal oxide is reduced and then enters molten steel, so that the metal in RH cold steel can be recovered, and the blowing cost and blowing loss of cold steel added into a converter as scrap steel are saved. Saving the use of slag melting agent in the LF smelting process, forming slag rapidly and recycling about 500-600 kg/ton of metal with high efficiency, and having good practical value and economic benefit.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an LF smelting process utilizing RH cold steel slag formation.
Background
In the RH smelting process, more cold steel can be accumulated in the vacuum tank, and the common practice is to transport the cold steel to a slag treatment process after oxidizing the cold steel, and return the cold steel to a scrap steel area after crushing and magnetic separation to be added into a converter for digestion. The method has the problems of difficult magnetizing of cold steel, low metal yield and blowing loss.
In the LF smelting process, besides the conventional lime slag, a slag melting agent is added to perform slag melting and slag system component adjustment so as to achieve the metallurgical purposes of desulfurizing and removing impurities. The slag melting agent comprises fluorite and fluxing agent, the market price is higher, and the environment pollution problem exists when fluorite slag is used.
Disclosure of Invention
The invention aims to provide an LF smelting process utilizing RH cold steel slag formation, which has the functions of adjusting an LF slag system and recycling metal by adding the RH vacuum tank cold steel into a furnace in the LF treatment process, and saves the use of a slag melting agent in the LF smelting process and rapid slag formation.
The technical scheme adopted for solving the technical problems is as follows: an LF smelting process for slag formation by utilizing RH cold steel comprises the following steps:
1) Dropping after the RH cold steel is melted, placing the molten RH cold steel on a ladle car by using two small slag hoppers, and paving 8-10mm waste gunning materials at the bottom of the slag hoppers to prevent the cold steel from sticking to the slag hoppers;
2) After RH cooling steel for 1-2 times, hanging down a slag hopper, transporting the slag hopper to a scrap steel processing plant to be broken into cold steel fragments after tipping bucket, transporting the cold steel fragments back to an LF area, and adding the cold steel fragments into a storage bin;
3) In the LF smelting process, after 1-2min from the beginning of heating, 1000-1500kg of lime is added into the furnace;
4) After lime is put into the furnace, RH cold steel fragments are added into the furnace in two batches, and the addition amount of a single batch is 50-70kg;
5) 60-100kg of calcium carbide and 100-150kg of fluxing agent are added into the furnace;
6) After the heating is completed, 50-100kg of aluminum particles are added into the furnace, and the argon flow is set to be 80m 3 Stirring for 2-3min;
7) Dipping a slag sample by using an oxygen burning tube, and observing the thickness of the slag sample to be 1-2mm, wherein the color is white;
8) And (5) completing subsequent desulfurization and alloy addition according to an LF smelting general process.
Preferably, the diameter of the cold steel fragments in step 2) is 2-3cm.
The invention has the following beneficial effects:
the invention is characterized in that cold steel generated in the RH smelting process is crushed and then added into a bin of LF, RH cold steel fragments are added in the LF smelting process, and Al contained in the RH cold steel 2 O 3 Enters the slag, and can play a role in adjusting slag components and reducing the integral melting point of the slag; meanwhile, the RH cold steel contains about 60% of metal elements, and the RH cold steel is reduced into molten steel in the LF slagging and deoxidizing process, so that metals can be recovered, the blowing cost and the blowing loss of the cold steel as scrap steel added into a converter are saved, the RH cold steel recycling mode is optimized, and the metal yield is improved.
The difficulty that RH cold steel cannot be transported by a magnetic crane when being added into a converter for converting as scrap steel is eliminated, the consumption of fluorite and fluxing agent in the LF deoxidization and slagging process is reduced, the slag fluidity in the LF smelting process is improved, slag agglomeration is reduced, and the LF desulfurization rate and the desulfurization efficiency are improved. Can save the use of slag melting agent in the LF smelting process, form slag rapidly and recycle about 500-600 kg/ton of metal efficiently, and has good practical value and economic benefit.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention are further described, but the scope of the present invention is not limited to these examples. All changes and equivalents that do not depart from the gist of the invention are intended to be within the scope of the invention.
An LF smelting process for slag formation by utilizing RH cold steel comprises the following steps:
1) The RH cold steel is dripped after being melted, two small slag hoppers are used for being placed on a ladle car, the size of each slag hopper is 1500 x 750mm, 8-10mm waste gunning materials are paved at the bottom of each slag hopper, and the cold steel is prevented from adhering to the slag hopper.
2) After RH cooling steel for 1-2 times, hanging down the slag hopper, transporting the slag hopper to a scrap steel processing factory to be broken into cold steel fragments with the diameter of 2-3cm after tipping bucket, transporting the cold steel fragments back to an LF area, and adding the cold steel fragments into a storage bin.
3) In the LF smelting process, lime of 1000-1500kg is added into the furnace after 1-2min from the beginning of heating.
4) After lime is added, RH cold steel fragments are added into the furnace in two batches, and the addition amount of a single batch is 50-70kg.
5) 60-100kg of calcium carbide and 100-150kg of fluxing agent are added into the furnace.
6) After the heating is completed, 50-100kg of aluminum particles are added into the furnace, and the argon flow is set to be 80m 3 And/h, stirring for 2-3min.
7) The slag sample is dipped by an oxygen burning tube, the thickness of the slag sample is observed to be 1-2mm, and the color is white.
8) And (5) completing subsequent desulfurization and alloy addition according to an LF smelting general process.
Collecting and crushing RH cold steel, adding 100-140kg of RH cold steel fragments into an LF silo, adding 100-140kg of RH cold steel fragments into the furnace by using a chute in the early stage of LF smelting, and melting the cold steel in the heating process to obtain Al contained in the cold steel 2 O 3 Into slag, regulating CaO-SiO in slag system 2 -Al 2 O 3 In a low melting point region, while about 60% of the metal oxides contained in the RH cold steel are reduced by aluminum, and also some alumina is formed into the slag; the metal oxide is reduced and then enters molten steel, so that the metal in RH cold steel can be recovered, and the blowing cost and blowing loss of cold steel added into a converter as scrap steel are saved.
The present invention is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present invention can fall within the scope of the present invention if the present invention has the same or similar technical solutions.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (2)
1. An LF smelting process for slag formation by utilizing RH cold steel is characterized by comprising the following steps:
1) Dropping after the RH cold steel is melted, placing the molten RH cold steel on a ladle car by using two small slag hoppers, and paving 8-10mm waste gunning materials at the bottom of the slag hoppers to prevent the cold steel from sticking to the slag hoppers;
2) After RH cooling steel for 1-2 times, hanging down a slag hopper, transporting the slag hopper to a scrap steel processing plant to be broken into cold steel fragments after tipping bucket, transporting the cold steel fragments back to an LF area, and adding the cold steel fragments into a storage bin;
3) In the LF smelting process, after 1-2min from the beginning of heating, 1000-1500kg of lime is added into the furnace;
4) After lime is put into the furnace, RH cold steel fragments are added into the furnace in two batches, and the addition amount of a single batch is 50-70kg;
5) 60-100kg of calcium carbide and 100-150kg of fluxing agent are added into the furnace;
6) After the heating is completed, 50-100kg of aluminum particles are added into the furnace, and the argon flow is set to be 80m 3 Stirring for 2-3min;
7) Dipping a slag sample by using an oxygen burning tube, and observing the thickness of the slag sample to be 1-2mm, wherein the color is white;
8) And (5) completing subsequent desulfurization and alloy addition according to an LF smelting general process.
2. LF smelting process using RH-cold steel slag formation according to claim 1, characterized in that the diameter of the cold steel fragments in step 2) is 2-3cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310204086.9A CN116162763A (en) | 2023-03-06 | 2023-03-06 | LF smelting process for slag formation by utilizing RH cold steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310204086.9A CN116162763A (en) | 2023-03-06 | 2023-03-06 | LF smelting process for slag formation by utilizing RH cold steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116162763A true CN116162763A (en) | 2023-05-26 |
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ID=86416352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310204086.9A Pending CN116162763A (en) | 2023-03-06 | 2023-03-06 | LF smelting process for slag formation by utilizing RH cold steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116162763A (en) |
-
2023
- 2023-03-06 CN CN202310204086.9A patent/CN116162763A/en active Pending
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