CN114717382A - Electric arc furnace steelmaking method - Google Patents
Electric arc furnace steelmaking method Download PDFInfo
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- CN114717382A CN114717382A CN202210351386.5A CN202210351386A CN114717382A CN 114717382 A CN114717382 A CN 114717382A CN 202210351386 A CN202210351386 A CN 202210351386A CN 114717382 A CN114717382 A CN 114717382A
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- electric arc
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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
- C21C5/54—Processes yielding slags of special composition
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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
- C21C7/0645—Agents used for dephosphorising or desulfurising
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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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application discloses an electric arc furnace steelmaking method, and relates to the technical field of steel smelting. The electric arc furnace steelmaking method comprises the following steps: treating the refining tailings; smelting in an electric arc furnace: the refining tailings are added in the melting stage, and the addition amount of the refining tailings is 0.8 wt% of the molten steel. In the technical scheme, the refining tailings are added in the melting stage of electric arc furnace smelting to replace quicklime and molten iron, waste utilization is carried out on the refining tailings, and the problem of high difficulty in controlling the slag condition in the conventional process is solved.
Description
Technical Field
The application relates to the technical field of steelmaking, in particular to an electric arc furnace steelmaking method.
Background
Electric arc furnace steelmaking is a method of making steel by inputting electric energy into an electric arc furnace through a graphite electrode and using an electric arc generated between an electrode end and a charging material as a heat source. The electric arc furnace uses electric energy as a heat source, can adjust the atmosphere in the furnace, and is very favorable for smelting steel containing more easily-oxidizable elements. For example, chinese patent publication No. CN109280741A discloses a method for refining austenitic stainless steel, which includes the steps of charging steelmaking raw materials into an EAF electric arc furnace, spraying a mixture of carbon powder and aluminum powder, melting the steelmaking raw materials into molten steel, and then adding a slag former and a reducing agent.
In the smelting process of the electric arc furnace, quicklime is mainly used as a slagging material, the lime is melted by utilizing the oxidation of iron, the burning loss of the iron is large, the slag condition is basically adjusted by the content of FeO in the slag, and the problems of high operation difficulty, slow lime melting and incomplete melting exist, so that the utilization rate of the slagging material is low, and the dephosphorization effect is unstable. Meanwhile, the high FeO slagging material is easy to mutually infiltrate into the molten steel and is difficult to separate.
With the development of low silicification of blast furnace molten iron, the silicon content of the molten iron is lower than 0.35 percent, and slagging and dephosphorization are more difficult in the smelting process of an electric arc furnace; in addition, the conventional smelting method is adopted for low-phosphorus steel, so that molten steel peroxidation caused by post-repair blowing in the later period of steelmaking cannot be avoided. Therefore, it is urgently needed to research an electric arc furnace steelmaking method, improve the utilization rate of slagging materials and ensure the stability of dephosphorization effect.
Disclosure of Invention
The application aims to provide an electric arc furnace steelmaking method, which uses refined tailings to replace part of quick lime, improves the utilization rate of slagging materials, and ensures the stability of dephosphorization effect.
In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: an electric arc furnace steelmaking method comprising the steps of:
treating the refining tailings;
smelting in an electric arc furnace: the refining tailings are added in the melting stage, and the addition amount of the refining tailings is 0.8 wt% of the molten steel.
In the technical scheme, the refining tailings are added in the melting stage of electric arc furnace smelting to replace quicklime and molten iron, the refining tailings have the characteristics of low melting point and self-melting at the steelmaking temperature, primary slag can be quickly formed without the condition of high iron oxide and the addition of a fluxing agent, and the dephosphorization capability is fully exerted. In addition, since the refining tailings inherently contain a certain amount of Al2O3And SiO2The method can be suitable for smelting under the condition of low-silicon molten iron, and the problems of drying return and difficult slag melting in the process can be avoided.
Further, according to the embodiments of the present application,wherein the refining tailings comprise: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO 2.
Further, according to the embodiment of the application, in the step of processing the refining tailings, the refining tailings are cooled and screened to remove impurities.
Further, according to the embodiment of the application, the particle size of the refining tailings is less than or equal to 40 mm.
Further, according to the embodiment of the application, in the smelting step of the electric arc furnace, lime is added according to the condition of slagging, and the addition amount of the lime is 1.5-2 wt%.
Further, according to the embodiment of the present application, wherein, in the electric arc furnace smelting step, lime is added after the end of melting, such as the arc, cannot be covered with slag, the lime is added in an amount of 0.3 to 0.5 wt%.
Further, according to the embodiment of the application, in the electric arc furnace smelting step, lime is added in small batches in the oxidation period, and the addition amount of the lime is 0.3-0.5 wt%.
Further, according to the embodiment of the application, in the electric arc furnace smelting step, in the oxidation period, if slagging condition is not good, the refining tailings are added, and the addition amount of the refining tailings is 0.3-0.5 wt%.
Further, according to the embodiment of the application, in the electric arc furnace smelting step, the alkalinity of the slag is ensured to be 2.5-3.5 in the oxidation period.
In order to achieve the purpose, the embodiment of the application also discloses a steel which is smelted by adopting the electric arc furnace steelmaking method.
Compared with the prior art, the method has the following beneficial effects: according to the method, the refining tailings are added in the melting stage of smelting in the electric arc furnace to replace quicklime and molten iron, the refining tailings have the characteristics of low melting point and self-melting at the steelmaking temperature, the initial slag can be quickly formed without the condition of high iron oxide and the addition of a fluxing agent, and the dephosphorization capability is fully exerted. In addition, due to refiningThe tailings inherently contain a certain amount of Al2O3And SiO2The method can be suitable for smelting under the condition of low-silicon molten iron, and the problems of drying return and difficult slag melting in the process can be avoided.
Detailed Description
In order to make the objects and technical solutions of the present invention clear and fully described, and the advantages thereof more apparent, the following embodiments of the present invention are described in further detail. It should be understood that the specific embodiments described herein are illustrative of some, but not all, embodiments of the invention and are not to be construed as limiting the scope of the invention, as those skilled in the art will recognize and appreciate that many other embodiments can be made without inventive faculty.
In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
The application discloses an electric arc furnace steelmaking method, which comprises the following steps:
treating the refining tailings;
smelting in an electric arc furnace: the refining tailings are added in the melting stage, and the addition amount of the refining tailings is 0.8 wt% of the molten steel.
The existing electric arc furnace smelting method adopts high-melting-point materials such as quicklime, dolomite and the like for slagging, the lime melting is mainly completed through a large amount of oxidation of iron, the slagging speed is low, and the low-temperature condition in the early stage of smelting cannot be well utilized for effectively dephosphorizing. The refining tailings adopted by the method have the characteristics of low melting point and self-melting at the steelmaking temperature, and can quickly form primary slag without the condition of high iron oxide and the addition of a fluxing agent, so that the dephosphorization capability is fully exerted. Meanwhile, since the refining tailings inherently contain a certain amount of Al2O3And SiO2The method can be suitable for smelting under the condition of low-silicon molten iron, and the problems of drying return and difficult slag melting in the process can be avoided.
The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2. Such refining tailings are generally not utilized as waste, and the electric arc furnace steelmaking method described herein provides a means for utilizing the refining tailings.
Furthermore, in the conventional electric arc furnace smelting process, the difficulty in controlling the slag condition is high, and the steel leakage of the furnace door is easy to occur, so that the loss of molten steel is caused. In the present application, the refining tailings forming slag system contains 10-18 wt% Al2O3The melting point of the slag system is reduced to be lower than 1420 ℃, and the stability is good. At the same time, FeO in the slag system containsThe amount is 15-30 wt%, so that the slag system can keep good fluidity, the steel slag has obvious layering phenomenon, the steel leakage phenomenon in the slag is obviously reduced, the slag inclusion phenomenon of the molten steel is improved, the purity of the molten steel is improved, the problems of difficult separation of the steel slag/serious slag inclusion of the primary molten steel in the prior art are solved, and the subsequent refining process is facilitated.
In addition, in the step of treating the refining tailings, the refining tailings are cooled and screened, impurities are removed, and undersize materials with the particle size of less than or equal to 40mm are stored in a high-position storage bin.
In the smelting step of the electric arc furnace, lime is added according to the condition of slagging, and the addition amount of the lime is 1.5-2 wt%. At the end of the melting, when the arc is no longer covered by slag, lime is added, said lime being added in an amount of 0.3 to 0.5% by weight.
In the oxidation period, lime is added for a plurality of times in small batches, and the addition amount of the lime is 0.3 to 0.5 weight percent each time. And if the slagging condition is not good, adding refining tailings, wherein the addition amount of the refining tailings is 0.3-0.5 wt%, ensuring the alkalinity of the slag to be 2.5-3.5, and keeping the generation of good foam slag.
This application can melt the slag charge within 1 minute fast through adding low melting point refining tailings at electric arc furnace smelting process, and lime can fully melt to improve the dephosphorization effect. Meanwhile, CaO-FeO-Al with lower melting point is formed2O3-SiO2The slag is tied, the FeO content in the slag is reduced to be below 20 wt%, and better fluidity can be kept at lower smelting temperature. After the electric arc furnace steelmaking method is implemented, the consumption of quick lime is reduced by 10kg/t, the consumption of iron and steel materials is reduced by 5kg/t, and the recycling of refining tailings is realized.
The technical effects of the present application will be further described below by way of examples and comparative examples, but the present application is not limited to these examples.
[ example 1 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.1% into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.6 wt% of lime is added after slagging. At the end of the melting, 0.4 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, 0.3 wt% of refining tailings is added according to the slag melting condition after 1.5h of smelting, the smelting is continued for 10min, and the alkalinity of the final slag is 2.7.
The slag flowing, the slag skimming and the tapping are carried out, the phosphorus content is 0.013 percent and the dephosphorization rate is 87 percent after the treatment.
[ example 2 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.12 percent into an electric arc furnace for melting, and keeping the melting temperature at 1350-1400 ℃. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.8 wt% of lime is added after slagging. At the end of the melting, 0.3 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, and after 1.5h of smelting, the alkalinity of the final slag is 2.6.
The slag is removed, the steel is tapped, the phosphorus content is 0.015 percent and the dephosphorization rate is 87.5 percent after the treatment.
[ example 3 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.9 percent into an electric arc furnace for melting, and keeping the melting temperature at 1350-1400 ℃. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.5 wt% of lime is added after slagging. At the end of the melting, 0.5 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, 0.5 wt% of refining tailings is added according to the slag melting condition after 1.5h of smelting, the smelting is continued for 10min, and the alkalinity of the final slag is 2.7.
The slag flowing, the slag removing and the tapping are carried out, the phosphorus content is 0.012 percent and the dephosphorization rate is 86.7 percent after the treatment.
[ example 4 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20% by weight of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.13% into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.6 wt% of lime is added after slagging. At the end of the melting, 0.4 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, the smelting is carried out for 1.5h, and the alkalinity of the final slag is 2.5.
The slag flowing, the slag skimming and the tapping are carried out, the phosphorus content is 0.015 percent and the dephosphorization rate is 88.5 percent after the treatment.
[ example 5 ] A method for producing a polycarbonate
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.08 percent into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.5 wt% of lime is added after slagging. At the end of the melting, 0.5 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, 0.4 wt% of refining tailings is added according to the slag melting condition after 1.5h of smelting, the smelting is continued for 10min, and the final slag alkalinity is 2.9.
The slag is discharged, the slag is removed, and the steel is tapped, the phosphorus content is 0.009% after the treatment, and the dephosphorization rate is 88.8%.
[ example 6 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.15% into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% of refining tailings is added in the initial stage of melting, and 2 wt% of lime is added after slagging. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, 0.5 wt% of refining tailings is added according to the slag melting condition after 1.5h of smelting, the smelting is continued for 10min, and the alkalinity of the final slag is 3.2.
The slag is removed, and steel is tapped, the phosphorus content is 0.018 percent after treatment, and the dephosphorization rate is 88 percent.
[ example 7 ]
And treating the refining tailings, cooling and screening the refining tailings, removing impurities, and storing undersize products with the particle size of less than or equal to 40mm in a high-level storage bin. The refining tailings contain: 45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.14% into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% of refining tailings is added in the initial stage of melting, and 1.6 wt% of lime is added after slagging. At the end of the melting, 0.3 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, the smelting is carried out for 1.5h, and the alkalinity of the final slag is 2.5.
The slag flowing, the slag skimming and the tapping are carried out, the phosphorus content is 0.016 percent and the dephosphorization rate is 88.6 percent after the treatment.
Comparative example 1
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.1 percent into an electric arc furnace for melting, and keeping the melting temperature at 1350-1400 ℃. 0.8 wt% of lime is added in the initial stage of melting, and 1.6 wt% of lime is added after slagging. At the end of the melting, lime was added in an amount of 0.4 wt%. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, the smelting is carried out for 1.5h, and the final slag alkalinity is 2.5.
The slag flowing, the slag skimming and the tapping are carried out, the phosphorus content is 0.02 percent after the treatment, and the dephosphorization rate is 80 percent.
Comparative example 2
Smelting in an electric arc furnace: adding the steel material with the phosphorus content of 0.15% into an electric arc furnace for melting, and keeping the melting temperature at 1350-. 0.8 wt% lime is added in the initial stage of melting, and 2 wt% lime is added after slagging. At the end of the melting, 0.4 wt% lime was added. In the oxidation period, the furnace temperature is raised to 1500 ℃, 0.4 wt% of lime is added for three times, the smelting is carried out for 1.5h, and the alkalinity of the final slag is 2.7.
The slag flowing, the slag removing and the tapping are carried out, the phosphorus content after the treatment is 0.029 percent, and the dephosphorization rate is 80.7 percent.
Comparing examples 1-7 and comparative examples 1-2, it can be seen that the slag charge can be rapidly melted within 1 minute by adding the low melting point refining tailings during the electric arc furnace smelting process, and the dephosphorization rate can be stably maintained at 85% or more. After the electric arc furnace steelmaking method is implemented, the consumption of quick lime is reduced by 10kg/t, the consumption of iron and steel materials is reduced by 5kg/t, and the recycling of refining tailings is realized.
Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.
Claims (10)
1. An electric arc furnace steelmaking method, characterized by comprising the steps of:
treating the refining tailings;
smelting in an electric arc furnace: the refining tailings are added in the melting stage, and the addition amount of the refining tailings is 0.8 wt% of the molten steel.
2. The electric arc furnace steelmaking method of claim 1, wherein the refining tailings comprise:
45-58 wt% of CaO, 15-30 wt% of Al2O35-20 wt% of SiO2。
3. The electric arc furnace steelmaking method of claim 1, wherein in the step of processing the refining tailings, the refining tailings are cooled and sieved to remove impurities.
4. The electric arc furnace steelmaking method of claim 1, wherein the grain size of the refining tailings is 40mm or less.
5. The steelmaking method of claim 1, wherein lime is added in the smelting step of the electric arc furnace according to the slagging condition, and the addition amount of the lime is 1.5-2 wt%.
6. The steelmaking process using an electric arc furnace as claimed in claim 1, wherein in the step of smelting in the electric arc furnace, lime is added after the end of melting when the arc is not covered with slag, and the amount of lime added is 0.3-0.5 wt%.
7. The electric arc furnace steelmaking process of claim 1, wherein in the electric arc furnace smelting step, lime is added in small batches in an amount of 0.3 to 0.5 wt% each time during the oxidation period.
8. The electric arc furnace steelmaking method of claim 1, wherein in the electric arc furnace smelting step, during an oxidation period, if slagging condition is not good, refining tailings are added, and the addition amount of the refining tailings is 0.3-0.5 wt%.
9. The electric arc furnace steelmaking process of claim 1, wherein in said electric arc furnace smelting step, a slag basicity of 2.5 to 3.5 is ensured during the oxidation phase.
10. A steel product produced by an electric arc furnace steelmaking process as claimed in any one of claims 1 to 9.
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| JP2011084777A (en) * | 2009-10-15 | 2011-04-28 | Sumitomo Metal Ind Ltd | Steel-making refining method performed by using electric furnace |
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| CN104278131A (en) * | 2014-10-27 | 2015-01-14 | 山东钢铁股份有限公司 | Recycling method for refining slags |
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
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2022
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403021A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Utilization method for steel scoria |
| JP2011084777A (en) * | 2009-10-15 | 2011-04-28 | Sumitomo Metal Ind Ltd | Steel-making refining method performed by using electric furnace |
| CN102787207A (en) * | 2012-08-08 | 2012-11-21 | 江苏大学 | Fluoride-free slagging flux for electric-arc furnace steelmaking |
| CN104278131A (en) * | 2014-10-27 | 2015-01-14 | 山东钢铁股份有限公司 | Recycling method for refining slags |
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
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