CN119193962A - A low iron consumption, low silicon, double-linked and low slag smelting method - Google Patents
A low iron consumption, low silicon, double-linked and low slag smelting method Download PDFInfo
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- CN119193962A CN119193962A CN202411361592.XA CN202411361592A CN119193962A CN 119193962 A CN119193962 A CN 119193962A CN 202411361592 A CN202411361592 A CN 202411361592A CN 119193962 A CN119193962 A CN 119193962A
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- 239000002893 slag Substances 0.000 title claims abstract description 85
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 42
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 32
- 238000003723 Smelting Methods 0.000 title claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 19
- 239000010703 silicon Substances 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000007664 blowing Methods 0.000 claims abstract description 28
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 229910000514 dolomite Inorganic materials 0.000 claims description 8
- 239000010459 dolomite Substances 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000005261 decarburization Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000001408 Carbon monoxide poisoning Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
-
- 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
-
- 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
-
- 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
-
- 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
- C21C2007/0093—Duplex process; Two stage processes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
本发明涉及一种低铁耗低硅双联少渣的冶炼方法，属于冶炼的技术领域。冶炼方法包括以下步骤：（1）投料；（2）吹炼；（3）终点控制；（4）出钢；（5）溅渣；步骤（1）为：向转炉中投入铁水和废钢，其中铁水为70%~73%，其余为废钢，采用转炉冶炼；铁水中w[P]≤0.18%，w[Si]≤0.40%。本发明方法在减少冶炼渣量的同时提高了转炉脱磷效率，转炉终点钢水化学成分中w[P]≤0.015％，减少了吹炼结束后需要等待成分检测的步骤，减少了冶炼周期。The present invention relates to a low iron consumption, low silicon, double-linked and low slag smelting method, belonging to the technical field of smelting. The smelting method comprises the following steps: (1) feeding; (2) blowing; (3) endpoint control; (4) tapping; (5) slag splashing; step (1) is: adding molten iron and scrap steel into a converter, wherein the molten iron is 70% to 73% and the rest is scrap steel, and smelting is performed in a converter; w[P]≤0.18% and w[Si]≤0.40% in the molten iron. The method of the present invention improves the dephosphorization efficiency of the converter while reducing the amount of smelting slag, and the chemical composition of the molten steel at the converter endpoint w[P]≤0.015%, which reduces the steps of waiting for component detection after blowing, and reduces the smelting cycle.
Description
Technical Field
The invention belongs to the technical field of smelting, and particularly relates to a low-iron-loss low-silicon duplex slag-less smelting method.
Background
The waste steel is used as an energy-carrying resource, and the increase of the use amount of the waste steel is beneficial to reducing the production pressure of high-energy-consumption procedures such as coking, sintering, iron making and the like. The method can save a large amount of coke and raw coal, is also beneficial to reducing carbon emission and wastewater emission in the steel production process, and promotes the steel industry to develop into low carbon and green. In order to reduce the cost and increase the efficiency and increase the profit of ton steel, steel enterprises generally adopt a method for increasing the scrap ratio. With the continuous improvement of the steel scrap ratio, the heat quantity in the furnace is insufficient, the original heat balance is broken, sludge and terminal peroxidation are easy to occur, problems are brought to production and quality, and the ton steel cost is indirectly improved.
To solve these problems, various iron and steel enterprises have proposed many methods. For example, patent CN112981039a discloses a scrap steel preheating system and a working method, in which the scrap steel preheating method is adopted, scrap steel needs to be preheated in a ladle, field equipment needs to be modified, the used combustible gas is CO, carbon monoxide poisoning or explosion accidents easily occur, and life health of workers is threatened. For another example, patent CN114196798a discloses a single-channel secondary combustion oxygen lance and a method for using the same, which can increase the combustion rate of CO and supply heat to the furnace. However, the oxygen lance needs to be modified, the service life of the modified oxygen lance is low, secondary combustion is performed above a molten pool, heat is easy to be pumped away, the heat efficiency is low, the gas value of a converter is influenced, adverse effects are brought to a lime kiln, the blowing time can be prolonged due to the fact that a heating agent is added into the converter, siO 2 is formed after the main heating element Si is oxidized, the slag alkalinity is reduced, the slag alkalinity is increased due to the fact that lime is additionally added, and the slag quantity is increased.
Disclosure of Invention
Aiming at the problem of high residue content caused by the improvement of the scrap steel ratio in the prior art, the invention provides a low-iron-consumption low-silicon duplex slag-free smelting method for solving the problem. The method of the invention improves dephosphorization efficiency of the converter while reducing smelting slag amount, and reduces the steps of waiting for component detection after finishing blowing and smelting period, wherein w P in chemical components of molten steel at the end point of the converter is less than or equal to 0.015 percent.
The technical scheme of the invention is as follows:
a smelting method of low iron loss and low silicon duplex slag reduction comprises the following steps:
the method comprises the steps of (1) feeding, (2) converting, (3) end point control, (4) tapping and (5) slag splashing;
The step (1) is to put molten iron and scrap steel into a converter, wherein the molten iron accounts for 70% -73%, the rest is scrap steel, the converter is adopted for smelting, and w P is less than or equal to 0.18% and w Si is less than or equal to 0.40% in the molten iron.
Further, in the step (1), the molten iron charged into the furnace is less than 185 tons.
In the step (2), during the blowing process, slag-making materials such as lime, raw dolomite, magnesium balls, sinter and the like and cold materials are added, the reaction condition in the furnace is judged through flame, gun position and flow rate are controlled, and decarburization and dephosphorization reactions are carried out.
Further, in the step (3), a sublance is used for measuring the blowing process, the end temperature and the components, lime or sinter is added into a furnace according to the process temperature to reduce the temperature of molten steel P to avoid the runaway caused by the high process temperature, the cooling effect of the lime is 10-12 ℃ per ton, the cooling effect of the sinter is 15-20 ℃ per ton, w [ C ] in the molten steel at the end of converter blowing is 0.04-0.10%, the end temperature is 1600-1640 ℃, and tapping is started after the blowing is finished.
In the step (4), an end slag sample is taken and detected during tapping, and the alkalinity is 2.6-3.3.
In the step (5), a proper amount of magnesium balls or raw dolomite (CaCO 3 and MgCO 3 are used as main components) is added according to the final slag condition to adjust the alkalinity and fluidity of slag, and the slag splashing operation time is 3-5 min.
Further, the slag components after slag splashing comprise 12-16% of SiO 2, 35-43% of CaO, 3-7% of MgO and 13-20% of TFe.
And (3) after the step (5) is finished, carrying out slag retention according to the tapping molten iron condition and the steel grade, wherein the slag retention amount in the furnace after the slag pouring is finished is 1-2 tons.
The invention has the beneficial effects that:
(1) The invention increases the heat in the converter by reducing the addition amount of slag-making materials and the total slag amount, increases the steel scrap addition amount and improves the steel scrap ratio. By reducing the total slag amount, the iron content in the slag is reduced, and the consumption of steel materials is reduced.
(2) The invention accelerates the dephosphorization reaction rate of the steel slag interface by utilizing the characteristics of good final slag alkalinity and high iron oxide fluidity. The dephosphorization efficiency of the converter in the desilication period is improved by reducing the adding amount of slag to accelerate the early-stage deslagging, the adding amount of slag is less in the process, the deslagging is ensured to be thoroughly melted, the dephosphorization efficiency of the converting process is improved, the endpoint wP of the converter is less than or equal to 0.015%, the dynamic dephosphorization and the late-stage back-phosphorus pressure are reduced, and the loss caused by the high phosphorus content of molten steel is avoided.
(3) The invention can pour slag once after slag splashing in the whole blowing process, and the slag is directly tapped without detecting endpoint components after carbon drawing is finished, thereby shortening the smelting period, improving the converter rhythm and reducing the smelting cost.
Detailed Description
In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Examples 1 to 3 were prepared by smelting AH36 steel using a 210 ton top-bottom combined blown converter.
Example 1
A smelting method of low iron loss and low silicon duplex slag reduction comprises the following steps:
(1) Feeding material
181 Tons of molten iron and 66 tons of scrap steel are put into a converter, wherein w P is 0.12% and Si is 0.15%.
(2) Converting by blowing
During blowing, adding 7134kg of lime, 632kg of magnesium balls, 299kg of ferrosilicon, 2600mm of a blowing gun position, 28500m 3/h of flow, 2300mm of a process gun position, 48500m 3/h of flow, properly adjusting the gun position according to the reaction in the furnace after the slag in the furnace is gasified, and carrying out decarburization and dephosphorization reaction by pulling the carbon gun position 2000mm and 51800m 3/h of flow.
(3) Endpoint control
The end point temperature and composition are measured by using sublance, w < C > is 0.063%, end point temperature is 1615 deg.C, and w < P > is 0.011% in the end point molten steel of converter blowing.
(4) Tapping steel
And after blowing, tapping is started, and a terminal slag sample is taken and detected during tapping, wherein the alkalinity is 2.9.
(5) Slag splashing
And adding 1033kg of raw dolomite according to the final slag condition to adjust the alkalinity and fluidity of slag, wherein the slag splashing operation time is 3-5 min. The slag components after slag splashing comprise SiO 2 14.7.7%, caO 43.8%, mgO 7.4% and TFe 17.2%.
(6) After the slag splashing is finished, slag is reserved according to the molten iron condition and the steel grade of the lower furnace, and the slag amount reserved in the furnace after the slag splashing is finished is 1.5 tons.
Example 2
A smelting method of low iron loss and low silicon duplex slag reduction comprises the following steps:
(1) Feeding material
179 Tons of molten iron and 66 tons of scrap steel are put into a converter, wherein w P is 0.106% and Si is 0.2%.
(2) Converting by blowing
During blowing, 6999kg of lime, 625kg of magnesium balls, 308kg of ferrosilicon, 2600mm of open blowing gun position, 28500m 3/h of flow, 2300mm of process gun position, 48500m 3/h of flow, proper adjustment of gun position according to furnace reaction after slag in the furnace is gasified, 2000mm of carbon pulling gun position, 51800m 3/h of flow, and decarburization and dephosphorization reaction are carried out.
(3) Endpoint control
The end point temperature and the components are measured by using a sublance, wherein w < C > is 0.045% and the end point temperature is 1629 ℃ in the end point molten steel of converter blowing, and w < P > is 0.012%.
(4) Tapping steel
And after blowing, tapping is started, and a terminal slag sample is taken and detected during tapping, wherein the alkalinity is 2.76.
(5) Slag splashing
Adding 1003kg of raw dolomite according to the final slag condition to adjust the alkalinity and fluidity of slag, wherein the slag splashing operation time is 3-5 min. The slag components after slag splashing comprise SiO 2 15.4.4%, caO 45.5%, mgO 5.59% and TFE14.7%.
(6) After the slag splashing is finished, slag is reserved according to the molten iron condition and the steel grade of the lower furnace, and the slag amount reserved in the furnace after the slag splashing is finished is 1.8 tons.
Example 3
A smelting method of low iron loss and low silicon duplex slag reduction comprises the following steps:
(1) Feeding material
181 Tons of molten iron and 67 tons of scrap steel are put into a converter, wherein w P is 0.126 percent and Si is 0.24 percent in the molten iron.
(2) Converting by blowing
During blowing, 7386kg of lime, 623kg of magnesium balls, 227kg of ferrosilicon and 678kg of raw dolomite are added, a blowing gun position is 2600mm, the flow is 28500m 3/h, a process gun position is 2300mm, the flow is 48500m 3/h, the gun position is properly adjusted according to the reaction in the furnace after slag in the furnace is completely melted, a carbon pulling gun position is 2000mm, and the flow is 51800m 3/h for decarburization and dephosphorization reaction.
(3) Endpoint control
The end point temperature and the components are measured by using a sublance, wherein w < C > is 0.065%, the end point temperature is 1630 ℃ and w < P > is 0.009% in the end point molten steel of converter blowing.
(4) Tapping steel
And after blowing, tapping is started, and a terminal slag sample is taken and detected during tapping, wherein the alkalinity is 3.0.
(5) Slag splashing
And adding 665kg of raw dolomite according to the final slag condition to adjust the alkalinity and fluidity of slag, wherein the slag splashing operation time is 3-5 min. The slag components after slag splashing comprise SiO 2 14.6.6%, caO 45.3%, mgO 4.8% and TFe 13.2%.
(6) After the slag splashing is finished, slag is reserved according to the molten iron condition and the steel grade of the lower furnace, and the slag amount reserved in the furnace after the slag splashing is finished is 1.3 tons.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. The smelting method of the low-iron-loss low-silicon duplex slag reduction is characterized by comprising the following steps of:
the method comprises the steps of (1) feeding, (2) converting, (3) end point control, (4) tapping and (5) slag splashing;
The step (1) is to put molten iron and scrap steel into a converter, wherein the molten iron accounts for 70% -73%, the rest is scrap steel, the converter is adopted for smelting, and w P is less than or equal to 0.18% and w Si is less than or equal to 0.40% in the molten iron.
2. The low iron loss low silicon duplex slag less smelting method of claim 1, wherein the molten iron charged in step (1) is less than 185 tons.
3. The smelting method of low iron loss and low silicon duplex slag reduction according to claim 1, wherein in the step (2), lime, raw dolomite, magnesium balls or sinter slag and cold charge are added in the blowing process, the reaction condition in the furnace is judged by flame, the gun position and flow rate are controlled, and decarburization and dephosphorization reactions are carried out.
4. The smelting method of low iron loss and low silicon duplex slag reduction according to claim 1, wherein the step (3) is characterized in that a sublance is used for measuring the blowing process, the end point temperature and the composition, lime or sinter is added into a furnace according to the process temperature to reduce the temperature of molten steel, the cooling effect of the lime is 10-12 ℃ per ton, the cooling effect of the sinter is 15-20 ℃ per ton, w [ C ] in the molten steel at the end point of the blowing of a converter is 0.04-0.10%, the end point temperature is 1600-1640 ℃, and the blowing is finished and tapping is started.
5. The low-iron-loss low-silicon duplex slag-free smelting method of claim 1, wherein in the step (4), a slag sample at the end point is taken for detection during tapping, and the alkalinity is 2.6-3.3.
6. The method for smelting low-iron-loss low-silicon duplex few-slag according to claim 1, wherein in the step (5), magnesium balls or raw dolomite are added according to the final slag condition to adjust the alkalinity and fluidity of slag, and the slag splashing operation time is 3-5 min.
7. The low-iron-loss low-silicon duplex slag-less smelting method according to claim 1, wherein slag components after slag splashing comprise 12% -16% of SiO 2%, 35% -43% of CaO, 3% -7% of MgO and 13% -20% of TFe.
8. The low-iron-loss low-silicon duplex slag-less smelting method according to claim 1, wherein after the step (5) is finished, slag is left according to the molten iron condition and the steel grade of the lower furnace, and the slag amount left in the furnace after the slag pouring is finished is 1-2 tons.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411361592.XA CN119193962A (en) | 2024-09-27 | 2024-09-27 | A low iron consumption, low silicon, double-linked and low slag smelting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411361592.XA CN119193962A (en) | 2024-09-27 | 2024-09-27 | A low iron consumption, low silicon, double-linked and low slag smelting method |
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