CN117737347A - Method for dephosphorizing, decarbonizing and steelmaking through melt separation of carbon-containing high-phosphorus DRI - Google Patents
Method for dephosphorizing, decarbonizing and steelmaking through melt separation of carbon-containing high-phosphorus DRI Download PDFInfo
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- CN117737347A CN117737347A CN202311764598.7A CN202311764598A CN117737347A CN 117737347 A CN117737347 A CN 117737347A CN 202311764598 A CN202311764598 A CN 202311764598A CN 117737347 A CN117737347 A CN 117737347A
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 104
- 239000011574 phosphorus Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 48
- 238000009628 steelmaking Methods 0.000 title claims abstract description 41
- 238000000926 separation method Methods 0.000 title description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000002893 slag Substances 0.000 claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000005261 decarburization Methods 0.000 claims description 17
- 230000006698 induction Effects 0.000 claims description 10
- 239000008188 pellet Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 48
- 229910052742 iron Inorganic materials 0.000 abstract description 20
- 238000003723 Smelting Methods 0.000 abstract description 6
- 238000005262 decarbonization Methods 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 230000003009 desulfurizing effect Effects 0.000 abstract description 2
- 239000000292 calcium oxide Substances 0.000 description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 21
- 239000002994 raw material Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a steelmaking method for dephosphorization and decarbonization of DRI containing high phosphorus, which comprises the following steps of heating and melting DRI cold balls containing high phosphorus and a slag former CaO in an electric furnace, removing slag, adding CaO for slagging, and then performing oxygen blowing and decarbonization and tapping. The method for smelting, dephosphorizing, decarbonizing and steelmaking by the DRI with high carbon content has high removal rate of phosphorus in the direct reduced iron with high phosphorus content, and the produced molten steel meets the requirements of Q235 steel on phosphorus content and carbon content. The process flow is simple, the economic value is high, the adaptability is high, the desulfurizing agent and the oxygen blowing time can be adjusted according to the requirement of the carbon and phosphorus content, different index requirements are met, a large amount of high-phosphorus iron ores are effectively utilized, and the economic value is high.
Description
Technical Field
The invention belongs to the technical field of DRI cold ball steelmaking, relates to a steelmaking method for dephosphorization and decarburization of carbon-containing high-phosphorus DRI, and particularly relates to a method for dephosphorization and decarburization steelmaking of carbon-containing high-phosphorus DRI melt.
Background
The direct reduced iron (DRI-Direct Reduced Iron) is a product obtained by reducing iron ore or other raw materials into iron at a high temperature, and can be used as a raw material for smelting high-quality steel or special steel, or as an iron-containing raw material for casting, ferroalloy, powder metallurgy or other processes. The direct reduced iron is typically produced as metallized pellets, i.e., DRI cold pellets, as a raw material for blast furnace steelmaking.
Iron ore is a guaranteed resource of the iron and steel industry in China, and belongs to a great strategic demand in China. With the rapid development of the iron and steel industry in China, the demand of the iron ore is rapidly increased, and the high-phosphorus oolitic iron ore is a kind of iron ore with huge reserves, and the domestic reserves only reach more than 30 hundred million tons, and account for more than ten percent of the domestic whole iron resource.
However, for both technical and economical reasons, the method has not been effectively utilized, and to date, there is no precedent for large-scale practical application, dephosphorization is difficult to be a major obstacle, and oolitic hematite is characterized by weak magnetism, high phosphorus content, extremely fine embedding granularity, serious mud phenomenon and complex structural type of ores.
At present, many researches on utilization of high-phosphorus oolitic hematite are carried out, and various aspects of physical mineral separation, magnetization roasting, chemical mineral separation, biological mineral separation and the like of the ore are studied, so that satisfactory dephosphorization effect cannot be achieved, and the requirement of steel on phosphorus content cannot be met.
Therefore, how to find a more suitable way to solve the above technical problems existing in the prior art has become one of the problems to be solved by many first-line researchers in the industry.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide a steelmaking method for dephosphorizing and decarbonizing a carbon-containing high-phosphorus DRI, in particular to a method for dephosphorizing and decarbonizing a carbon-containing high-phosphorus DRI melt. The steelmaking method provided by the invention has high removal rate of phosphorus in the high-phosphorus direct reduced iron, the produced molten steel meets the requirement of Q235 steel on phosphorus content, and the process flow is simple, has higher economic value and strong adaptability, and is more suitable for industrialized popularization and application.
The invention provides a steelmaking method for dephosphorization and decarburization of carbon-containing high-phosphorus DRI, which comprises the following steps:
1) And (3) heating and melting DRI cold balls containing high phosphorus and a slag former CaO in an electric furnace, removing slag, adding CaO for slag formation, then performing oxygen blowing decarburization, and tapping.
Preferably, the content of phosphorus in the DRI cold balls containing high phosphorus is 0.28 to 0.4 weight percent;
the content of carbon in the DRI cold balls containing carbon and high phosphorus is 0.5 to 3.0 weight percent.
Preferably, TFe in the DRI cold balls containing carbon and high phosphorus is more than 80%;
the MFe in the DRI cold balls containing high phosphorus is 60% -70%.
Preferably, the addition amount of CaO as the slag former is calculated by the slag alkalinity of 1.8-2.5;
after the slag skimming, the addition amount of CaO in the oxygen blowing decarburization period is calculated by the slag alkalinity of 2.5-3.0.
Preferably, the DRI cold balls containing high phosphorus and the slag former CaO are heated and melted in an electric furnace, namely, the DRI cold balls containing high phosphorus and the slag former CaO are added into the electric furnace at the same time, and the melting temperature is controlled to be 1500-1580 ℃.
Preferably, the alkalinity of the skimming slag is controlled to be 1.8-2.5.
Preferably, the electric furnace is specifically an intermediate frequency induction furnace.
Preferably, the time of oxygen blowing decarburization is 5-20 min.
Preferably, after oxygen blowing and decarburization, the temperature of a molten pool of tapping is 1580-1650 ℃, and the binary alkalinity of final slag is 2.5-3.0.
Preferably, the phosphorus content of the molten steel is less than 0.04wt%;
the slag amount of the steelmaking method is 3-10wt%.
The invention provides a steelmaking method for dephosphorization and decarburization of DRI containing high phosphorus, which comprises the following steps of heating and melting DRI cold balls containing high phosphorus and CaO serving as a slag former in an electric furnace, and then skimming slag; adding CaO to form slag, blowing oxygen to decarbonize, and tapping. Compared with the prior art, aiming at the problem that the existing high-phosphorus oolitic iron is difficult to effectively serve as a steelmaking raw material, the invention carries out intensive research on the basis of dephosphorization processes such as magnetizing roasting, physical beneficiation, chemical leaching, direct reduced iron and the like, and dephosphorization is continued in a smelting process under multiple pipes to meet the requirement of steel on phosphorus content, can reach the actual application stage of the steel, and has great effect on the application of a large amount of phosphorus oolitic hematite.
The invention creatively designs a steelmaking method for dephosphorizing and decarbonizing the DRI containing carbon and high phosphorus with specific process steps, has high removal rate of phosphorus in high-phosphorus direct reduced iron, and the produced molten steel meets the requirement of Q235 steel on phosphorus content.
According to the invention, a dephosphorization agent is added into a carbon-containing high-phosphorus DRI raw material (the P content is 0.3-0.4 wt%) and is directly heated and dephosphorized in an electric furnace, the dephosphorization process is carried out in stages, the P content in the primary dephosphorization stage is less than 0.08wt%, and the phosphorus content in molten steel can be lower than 0.04wt% in the deep dephosphorization stage. The invention combines the previous process procedures to finally utilize the high-phosphorus iron ore, so that the high-phosphorus iron ore is prepared to obtain a qualified molten steel product, a large amount of high-phosphorus iron ore can be effectively utilized, and the invention has huge economic value.
Experimental results show that the slag amount is 7% by adopting the molten dephosphorization decarbonization steelmaking method of the carbon-containing high-phosphorus DRI; the P content of the molten steel is lower than 0.04%, and the C content meets the requirements of common steel.
Drawings
FIG. 1 is a process flow chart of a method for dephosphorizing, decarbonizing and steelmaking by using carbon-containing high-phosphorus melt.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further the features and advantages of the invention and are not limiting of the patent claims of the invention.
All the raw materials of the present invention are not particularly limited in their sources, and may be purchased on the market or prepared according to conventional methods well known to those skilled in the art.
The purity of all the raw materials of the present invention is not particularly limited, and the present invention is preferably used in the industrial purity or conventional purity in the field of iron and steel smelting.
All raw materials of the invention, the brands and abbreviations of which belong to the conventional brands and abbreviations in the field of the related application are clear and definite, and the person skilled in the art can purchase from the market or prepare by the conventional method according to the brands, abbreviations and the corresponding application.
The invention provides a steelmaking method for dephosphorization and decarburization of carbon-containing high-phosphorus DRI, which comprises the following steps:
heating and melting DRI cold balls containing high phosphorus and a slag former CaO in an electric furnace, and then skimming; and adding CaO to slag, blowing oxygen to decarbonize, and tapping.
In the present invention, the carbonaceous high phosphorus DRI cold pellets are preferably DRI cold pellets prepared from oolitic hematite, more preferably carbonaceous high phosphorus DRI cold pellets prepared from high phosphorus oolitic iron.
In the present invention, the phosphorus content of the DRI cold sphere containing high phosphorus is preferably 0.28wt% to 0.4wt%, more preferably 0.3wt% to 0.38wt%, and still more preferably 0.32wt% to 0.36wt%.
In the present invention, the carbon content of the DRI cold sphere containing high carbon and phosphorus is preferably 0.5 to 3.0wt%, more preferably 1.0 to 3.0wt%, and still more preferably 1.5 to 2.5wt%.
In the present invention, the carbonaceous high phosphorus DRI cold spheres specifically comprise low carbon high phosphorus gas-based DRI cold spheres.
In the present invention, TFe in the DRI cold balls containing carbon and high phosphorus is preferably 80% or more.
In the present invention, the MFe in the DRI cold balls containing high phosphorus and carbon is preferably 60% to 70%, more preferably 60% to 65%, and still more preferably 62% to 65%.
In the present invention, the addition amount of CaO as the slag former is preferably 1.8 to 2.5, more preferably 1.9 to 2.4, still more preferably 2.0 to 2.3, and still more preferably 2.1 to 2.2 in terms of slag basicity.
In the present invention, the CaO is preferably added in an amount of 2.5 to 3.0, more preferably 2.6 to 2.9, still more preferably 2.7 to 2.8, as the slag basicity during oxygen decarburization after the slag skimming.
In the present invention, the DRI cold pellets containing high phosphorus and the slag former CaO are heated and melted in an electric furnace, preferably, the DRI cold pellets containing high phosphorus and the slag former CaO are added into the electric furnace at the same time, and the melting temperature is controlled to be preferably 1500-1580 ℃, more preferably 1515-1565 ℃, and even more preferably 1530-1550 ℃.
In the present invention, the basicity of the skimming is preferably controlled to be 1.8 to 2.5, more preferably 1.9 to 2.4, still more preferably 2.0 to 2.3, and still more preferably 2.1 to 2.2.
In the invention, the electric furnace is particularly preferably an intermediate frequency induction furnace.
In the present invention, the time for the oxygen blowing decarburization is preferably 5 to 20 minutes, more preferably 6 to 17 minutes, and still more preferably 6 to 14 minutes.
In the invention, after oxygen blowing decarburization, the molten pool temperature of tapping is preferably 1580-1650 ℃, the binary alkalinity of final slag is preferably 2.5-3.0, the molten pool temperature of tapping is more preferably 1595-1635 ℃, the binary alkalinity of final slag is preferably 2.6-2.9, the molten pool temperature of tapping is more preferably 1610-1620 ℃, and the binary alkalinity of final slag is preferably 2.7-2.8.
In the present invention, the phosphorus content of the molten steel is preferably less than 0.04wt%, more preferably less than 0.035wt%, and still more preferably less than 0.03wt%.
In the present invention, the slag amount of the steel-making method is preferably 3wt% to 10wt%, more preferably 4wt% to 9wt%, still more preferably 5wt% to 8wt%, and still more preferably 6wt% to 7wt%.
The invention is a complete and refined integral technical scheme, and better utilizes the carbon-containing high-phosphorus DRI as a steelmaking raw material to further improve the dephosphorization and decarbonization effects of the carbon-containing high-phosphorus DRI in the steelmaking process, and the method for directly smelting, dephosphorizing and steelmaking by the carbon-containing high-phosphorus DRI specifically comprises the following steps:
a molten dephosphorization and steelmaking method of DRI containing carbon and high phosphorus is characterized in that: the method comprises the following steps:
(1) The raw material high-phosphorus DRI cold ball contains about 0.3 to 0.4 weight percent of P, and the slag former comprises the following components: caO;
(2) The electric furnace adopts an intermediate frequency induction furnace, and the high-phosphorus DRI balls and the slag former are heated to 1550 ℃ for melting;
dephosphorization: adding a slag former CaO, checking, skimming slag and deslagging; caO dosage: about 85kg/tDRI;
(3) And adding CaO to slag, blowing oxygen to decarbonize, tapping, wherein the content of P in molten steel is less than 0.04wt%. The method comprises the steps of carrying out a first treatment on the surface of the CaO dosage: about 85kg/tDRI.
Specifically, the raw material in the step (1) is high-phosphorus carbon-containing DRI balls, TFe80%; MFe73%; c: about 2.3wt%; p is about 0.31wt%.
Specifically, the melting temperature in the step (2) is not higher than 1550 ℃;
specifically, the slag former in the step (2) is calcium oxide, and the CaO dosage is not more than 135kg/t DRI; the temperature is kept at not higher than 1550 ℃ for not lower than 5min;
specifically, in the step (3), oxygen blowing and decarburization are performed, the temperature is kept at 1550 ℃, the time is kept for more than 6min, the tapping temperature is increased to 1620 ℃ according to the carbon content condition and slightly adjusted.
Specifically, the slag amount is 7%; the P content of the molten steel is lower than 0.04%, and the C content meets the requirements of common steel.
Referring to fig. 1, fig. 1 is a process flow chart of a method for dephosphorizing, decarburizing and steelmaking by using carbon-containing high-phosphorus melt.
The invention provides a method for smelting, dephosphorizing, decarbonizing and steelmaking by using DRI containing carbon and high phosphorus. The steelmaking method for dephosphorizing and decarbonizing the carbon-containing high-phosphorus DRI with specific process steps has high removal rate of phosphorus in the high-phosphorus direct reduced iron, and the produced molten steel meets the requirements of Q235 steel on phosphorus content and carbon content. The process flow is simple, the economic value is high, the adaptability is high, the desulfurizing agent and the oxygen blowing time can be adjusted according to the requirement of the carbon and phosphorus content, and the different index requirements can be met.
According to the invention, a dephosphorization agent is added into a carbon-containing high-phosphorus DRI raw material (the P content is 0.3-0.4 wt%) and is directly heated and dephosphorized in an electric furnace, the dephosphorization process is carried out in stages, the P content in the primary dephosphorization stage is less than 0.08wt%, and the phosphorus content in molten steel can be lower than 0.04wt% in the deep dephosphorization stage. The invention combines the previous process procedures to finally utilize the high-phosphorus iron ore, so that the high-phosphorus iron ore is prepared to obtain a qualified molten steel product, a large amount of high-phosphorus iron ore can be effectively utilized, and the invention has huge economic value.
Experimental results show that the slag amount is 7% by adopting the molten dephosphorization decarbonization steelmaking method of the carbon-containing high-phosphorus DRI; the P content of the molten steel is lower than 0.04%, and the C content meets the requirements of common steel.
For further explanation of the present invention, a steelmaking process for dephosphorizing and decarbonizing carbonaceous high phosphorus DRI is described in detail below with reference to examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation procedures are given only for further explanation of the features and advantages of the present invention, and not limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the examples described below.
Example 1
Direct melting and primary dephosphorization 2 kg-level induction furnace test of DRI containing carbon and high phosphorus
TABLE 1 carbon and high phosphorus containing gas based DRI composition (wt%)
| TFe | MFe | FeO | C | CaO | SiO 2 | P | S | MgO | Al 2 O 3 | |
| High phosphorus containing carbon | 82.5 | 62.85 | 25.26 | 2.28 | 1.9 | 4.88 | 0.31 | 0.005 | 0.4 | 1.7 |
An induction furnace expansion experiment was performed using a carbon-containing high phosphorus gas-based DRI feedstock.
The method comprises the following specific steps:
(1) The induction furnace was heated to 1550℃and incubated for 5min for sampling (steel+slag), P0.33 wt%.
(2) After lime R=2.1 (78.6 kg/t DRI) is added, the steel sample is taken after 10 minutes of post-heat preservation, and [ P ] in the metal is reduced to 0.072wt%; c1.3 wt% and then skimming.
(3) The slag making amount is controlled to be 7% of the mass of molten steel, and lime is continuously added to the final slag with binary alkalinity of 2.8 (39 kg/t DRI is added).
(4) Using oxygen flow 1m 3 And/h, continuously blowing oxygen for 6min, sampling and tapping at 1620 ℃. The phosphorus content in the steel can be reduced to 0.028wt%; c:<0.1wt% of the total weight of the total componentsAnd obtaining Q235 molten steel with qualified carbon and phosphorus content.
Example 2
Direct melting and primary dephosphorization 2 kg-level induction furnace test of DRI containing carbon and high phosphorus
TABLE 2 carbon-containing high phosphorus gas-based DRI composition (wt%)
| TFe | MFe | FeO | C | CaO | SiO 2 | P | S | MgO | Al 2 O 3 | |
| High phosphorus containing carbon | 81.04 | 61.80 | 24.74 | 2.36 | 1.6 | 5.38 | 0.31 | 0.005 | 0.4 | 2.58 |
Adopting a gas-based DRI raw material containing high phosphorus and carrying out steelmaking dephosphorization in an induction furnace, and specifically comprises the following steps:
(1) The induction furnace was heated to 1550℃and kept for 5min for sampling (steel + slag), P0.34 wt%.
(2) Adding lime R=1.8 (85 kg/t DRI), then preserving heat for 10min to obtain a steel sample, and reducing [ P ] in metal to 0.080wt%; c1.2 wt% and then skimming.
(3) The slag making amount is controlled to be 7% of the mass of molten steel, and lime is continuously added to the final slag with binary alkalinity of 2.8 (49.65 kg/t DRI is added).
(4) Using oxygen flow 1m 3 And/h, continuously blowing oxygen for 6min, sampling and tapping at 1620 ℃. The phosphorus content in the steel can be reduced to 0.035wt%; c:<0.1wt% of Q235 molten steel with qualified carbon and phosphorus content is obtained.
The foregoing has outlined the detailed description of a method for melt-separating dephosphorizing decarbonizing steelmaking with a carbonaceous high phosphorus DRI, wherein specific examples are provided herein to illustrate the principles and embodiments of the invention and are intended to facilitate an understanding of the method and its core ideas, including the best mode, and to enable any person skilled in the art to practice the invention, including making and using any devices or systems, and performing any incorporated methods. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims. The scope of the patent protection is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
Claims (10)
1. A steelmaking method for dephosphorizing and decarbonizing a carbon-containing high-phosphorus DRI, which is characterized by comprising the following steps:
and (3) heating and melting DRI cold balls containing high phosphorus and a slag former CaO in an electric furnace, removing slag, adding CaO for slag formation, then performing oxygen blowing decarburization, and tapping.
2. The steelmaking process as claimed in claim 1, wherein said high phosphorus carbon-containing DRI cold balls have a phosphorus content of from 0.28 wt.% to 0.4 wt.%;
the content of carbon in the DRI cold balls containing carbon and high phosphorus is 0.5 to 3.0 weight percent.
3. The steelmaking process as claimed in claim 1, wherein said high phosphorus carbon-containing DRI cold balls have a TFe of 80% or more;
the MFe in the DRI cold balls containing high phosphorus is 60% -70%.
4. The steel-making method according to claim 1, wherein the slag former CaO is added in an amount of 1.8 to 2.5 in terms of slag basicity;
after the slag skimming, the addition amount of CaO in the oxygen blowing decarburization period is calculated by the slag alkalinity of 2.5-3.0.
5. The steelmaking process as claimed in claim 1, wherein said heating and melting the carbonaceous high phosphorus-containing DRI cold pellets and the slag former CaO in an electric furnace is performed by simultaneously adding the carbonaceous high phosphorus-containing DRI cold pellets and the slag former CaO into the electric furnace and controlling the melting temperature to 1500-1580 ℃.
6. The steelmaking method as claimed in claim 1, wherein the basicity of the skimming slag is controlled to be 1.8 to 2.5.
7. The steelmaking process as claimed in claim 1, wherein said electric furnace is an intermediate frequency induction furnace.
8. The steelmaking method as claimed in claim 1, wherein said oxygen decarburization is performed for a period of 5 to 20 minutes.
9. The steelmaking method as claimed in claim 1, wherein after said oxygen decarburization, the molten bath temperature of the steel is 1580 to 1650 ℃ and the binary basicity of the final slag is 2.5 to 3.0.
10. The steelmaking process as set forth in claim 1 wherein said molten steel has a phosphorus content of less than 0.04wt%;
the slag amount of the steelmaking method is 3-10wt%.
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