CN117344080A - Method for smelting low-silicon iron hydrated slag by converter - Google Patents
Method for smelting low-silicon iron hydrated slag by converter Download PDFInfo
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- CN117344080A CN117344080A CN202311379367.4A CN202311379367A CN117344080A CN 117344080 A CN117344080 A CN 117344080A CN 202311379367 A CN202311379367 A CN 202311379367A CN 117344080 A CN117344080 A CN 117344080A
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- Prior art keywords
- slag
- blowing
- oxygen supply
- silicon
- molten iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000002893 slag Substances 0.000 title claims abstract description 73
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 44
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 34
- 239000010703 silicon Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003723 Smelting Methods 0.000 title claims abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 52
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 17
- 239000004571 lime Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 9
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 9
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910000514 dolomite Inorganic materials 0.000 description 4
- 239000010459 dolomite Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009628 steelmaking Methods 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
- 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
- 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
- C21C2005/366—Foam slags
-
- 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
The invention discloses a method for smelting low-silicon iron hydrated slag by a converter, which comprises the steps of filling a main material into the converter, controlling the gun position to 1400-1600mm in the early stage of oxygen supply blowing for 0-2min, controlling the oxygen supply pressure to 0.84-0.88MPa and the oxygen supply flow to 26000-28000m 3 /h; 0.10% of molten iron and silicon, full slag-leaving operation, adding 300-400 kg of magnesite during slag splashing, adding 500kg of lime after slag splashing, starting blowing, adding slag charge with carbon fire, each time not exceeding 150kg, 0.05% of molten iron and silicon, full slag-leaving operation, adding 300-400 kg of magnesite during slag splashing, adding 300kg of lime after slag splashing, starting blowing, adding slag charge with carbon fire, each time 100kg, and maintaining constant-pressure oxygen supply in the final stage of blowing.
Description
Technical Field
The invention relates to a method for smelting low-silicon iron hydrated slag by a converter.
Background
The invention belongs to the field of basic oxygen top and bottom combined blown converter steelmaking, and is mainly used for high-efficiency blowing of low-silicon molten iron in large and medium-sized converters, in particular to a method for smelting low-silicon iron hydrated slag by a converter.
Disclosure of Invention
Because raw fuel used by the blast furnace fluctuates and the silicon content of molten iron supplied to a converter of a steel plant by the blast furnace of the iron mill often fluctuates greatly due to factors such as reducing the coke ratio, the method has higher requirements on the converter smelting process, and particularly when the silicon content of the molten iron is lower, the method supplies the molten iron to the converterThe smelting process brings a lot of technical problems. Firstly, in the smelting process of low-silicon molten iron, decarburization reaction is advanced, carbon oxidation is preferentially performed to silicon oxidation, and SiO in slag is preferentially performed to the oxidation of silicon 2 The dicalcium silicate which is difficult to enrich and appears earlier in the primary slag also prevents lime from melting, so that slag formation is difficult in the earlier stage of blowing and dephosphorization effects are poor. Secondly, along with the blowing process, the FeO content in the slag is gradually reduced, so that the melting of lime is more unfavorable, slag melting difficulty is caused, slag is easy to return to dryness, and the fluidity is poor. And the low-silicon molten iron slag layer is too thin, the amount is small, the coverage on the liquid level of the steel is poor, the foaming degree of the slag is reduced, and the metal splash is serious, so that serious accidents such as steel sticking of an oxygen lance and the like are further caused, the treatment cost is increased, and the smooth production is influenced. In addition, the silicon content in the molten iron is low, the CO gas content rises quickly after the converter blowing ignition is successful, and O 2 The content is reduced slowly, which is easy to cause the gun to fly or even discharge explosion. Therefore, the development of the low-silicon molten iron converting process has the advantages of good slag melting effect, high dephosphorization efficiency, less splashing, safety and high efficiency, and has very practical significance and popularization and application value.
Search document: liu Guo optimization of dephosphorization process of low-silicon molten iron by converter smelting, anhui Metallurgical, 2004, (stage 2), pages 45-47; dan Zhijiang, et al, research on low silicon smelting technology for ripple steel, china technical information, 2010, (12 th stage), pages 75-76; liang Xiangyuan, analyzing and controlling the reason for the high phosphorus content of the end point of the low-silicon low-temperature molten iron, and (Anshan Steel technique, 2010, (3 rd phase), pages 29-33).
The invention aims to provide a method for smelting low-silicon iron hydrated slag by a converter, which has the advantages of good slag melting effect, high dephosphorization efficiency, less splashing, safety and high efficiency, and is particularly suitable for 120t converter smelting.
The invention adopts the technical scheme that the method for smelting low-silicon iron hydration slag by a converter comprises the steps of filling a main material for converting into the converter, wherein the main material comprises 80.0-90.0% of low-silicon iron water by weight, the balance is scrap steel, then starting oxygen supply converting, controlling the gun position to 1400-1600mm in the early stage of converting for 0-2min, controlling the oxygen supply pressure to 0.84-0.88MPa and the oxygen supply flow to 26000-28000m 3 /h; molten iron silicon 0.10%, full retentionAdding 300-400 kg of magnesite during slag splashing, adding 500kg of lime after slag splashing, starting blowing, adding slag charge after carbon firing, and slowing down the sign of returning to a dry lance when the overall height of the gun position is 200mm and the slag charge is not more than 150kg each time; 0.05% of molten iron and silicon, fully leaving slag, adding 300-400 kg of magnesite during slag splashing, adding 300kg of lime after slag splashing, starting to blow, adding slag charge after firing with carbon and 100kg each time, and slowing down the signs of returning to a dry lance; in the final stage of blowing, constant pressure oxygen supply is maintained, the gun position is reduced to 110-120cm, the stirring of a molten pool is enhanced during the 85-95s of blowing, the blowing is stopped after the whole-course oxygen supply blowing time reaches 13-15min, and gun deslagging is carried out.
The invention has the following beneficial effects:
according to the blowing process, the temperature rising speed of molten iron is effectively controlled by adjusting the charging system of raw materials, the reaction of carbon and oxygen is inhibited, the content of FeO in slag is relatively high, so that the penetration degree of slag to lime is improved, the melting of lime is facilitated, the content of CaO in slag is increased, and the content of FeO, caO and SiO are improved 2 The compound with low melting point is introduced into the slag, so that the slag forming and dephosphorizing effects are obviously improved. On the other hand, silicon element contained in slag enters molten iron, so that SiO is improved to a certain extent 2 Content of SiO 2 Is beneficial to improving slag melting and dephosphorization effects.
The blowing process improves the control process of the oxygen lance in the blowing process, moderately improves the position of the open blowing lance, reduces the oxygen supply strength, and slows down the diffusion of C and O under the condition of insufficient stirring of a molten pool, thereby inhibiting the decarburization reaction speed of molten iron, forming FeO enrichment, further promoting the melting of lime, and the formed low-melting-point compound is beneficial to the reduction of the viscosity of slag and has better fluidity. In addition, the blowing process for moderately improving the gun position and reducing the oxygen flow is also beneficial to avoiding accidents such as the explosion unloading of the converter flue gas and the like and improving the production safety.
In conclusion, the blowing process disclosed by the invention is beneficial to early slag melting, slag penetration and good slag melting of low-silicon molten iron in the blowing process, and the dephosphorization efficiency is obviously improved. The foaming degree of the slag is good, the steel liquid level is completely covered, the steel sticking problems of oxygen guns, furnace mouths, smoke hoods and the like caused by splashing are reduced, the steel material loss is reduced to a certain extent, the strength of maintenance and cleaning work is reduced, the cost is saved, the production safety is improved, and the method has good popularization and application values.
Description of the embodiments
A method for smelting low-silicon iron hydration slag by a converter comprises the steps of filling a main material of 80.0-90.0% of low-silicon iron water and the balance of scrap steel into the converter, then starting oxygen supply blowing, controlling the gun position to 1400-1600mm, the oxygen supply pressure to 0.84-0.88MPa and the oxygen supply flow to 26000-28000m in the early stage of blowing for 0-2min 3 /h; 0.10% of molten iron and silicon, fully leaving slag, adding 300-400 kg of magnesite during slag splashing, adding 500kg of lime after slag splashing, starting blowing, adding slag charge after carbon fire, and slowing down the sign of returning to a dry lance every time, wherein the integral height of a gun position is 200 mm; 0.05% of molten iron and silicon, fully leaving slag, adding 300-400 kg of magnesite during slag splashing, adding 300kg of lime after slag splashing, starting to blow, adding slag charge after firing with carbon and 100kg each time, and slowing down the signs of returning to a dry lance; in the final stage of blowing, constant pressure oxygen supply is maintained, the gun position is reduced to 110-120cm, the stirring of a molten pool is enhanced during the 85-95s of blowing, the blowing is stopped after the whole-course oxygen supply blowing time reaches 13-15min, and gun deslagging is carried out.
Examples
The molten iron is blown by adopting a 120t top-bottom combined blown converter, and firstly, a main blowing material is filled in the converter, wherein the weight percentage of the main material is 84.0% of low-silicon molten iron, the actual filling amount is 138t, the balance is scrap steel, and the actual filling amount is 26t. The temperature of molten iron is 1305 ℃, and the weight percentages of elements are C:4.200%, si:0.120%, mn:0.420%, S:0.026%, P:0.120%. Then oxygen supply blowing is started, the purity of oxygen is more than or equal to 99.5 percent, the oxygen supply pressure is 0.86MPa, and the oxygen supply flow is 27000m 3 And/h, controlling the gun position to be 1500mm in 0-2min at the earlier stage of converting.
Adding 300-400 kg of magnesite during slag splashing, adding 500kg of lime after slag splashing, starting blowing, adding slag charge after carbon fire, keeping constant-pressure oxygen supply at each time of no more than 150kg, and improving the gun position to 1700mm.
In the final stage of blowing, constant-pressure oxygen supply is still kept, the gun position is reduced to 1125cm, the stirring of a molten pool is enhanced by blowing for 90s, the blowing is stopped after the whole-process oxygen supply blowing time reaches 13min, the gun is lifted, the slag is poured, and the weight percentage of elements of molten steel after the blowing is finished is P:0.020%, C:0.090%, the temperature of molten steel is 1664 ℃, and the weight percentage of steel slag composition is SiO2:10.10%, caO:43.32%, TFe:19.05%.
Examples
The molten iron is blown by adopting a 120t top-bottom combined blown converter, and firstly, a main blowing material is filled in the converter, wherein the weight percentage of the main material is 87.0 percent of low-silicon molten iron, the actual filling amount is 133t, the balance is scrap steel, and the actual filling amount is 20t. The temperature of molten iron is 1295 ℃, and the weight percentages of elements are C:4.850%, si:0.050%, mn:0.390%, S:0.032%, P:0.113%. Then oxygen supply blowing is started, the purity of oxygen is more than or equal to 99.5 percent, the oxygen supply pressure is 0.84MPa, and the oxygen supply flow is 26000m 3 And/h, 0-1.5 min in the earlier stage of converting, and controlling the gun position at 160cm.
Adding slag after blowing is started, wherein the consumption of the slag is 22.93kg of lime, 17.29kg of light burned dolomite, 6.70kg of iron ore and 47.70kg of pig iron per t of molten iron, the slag is added after blowing is started in 2 batches, and the added slag is lime, light burned dolomite and iron ore, and the addition amounts respectively account for 60%, 80% and 100% of the total consumption of the slag, the light burned dolomite and the iron ore; the second batch is added during 7min of converting, the added slag is lime and light burned dolomite, and the addition amounts respectively account for 40% and 20% of the total consumption. At this stage, constant pressure oxygen supply was maintained and the lance position was raised to 1755mm.
In the final stage of blowing, constant-pressure oxygen supply is still kept, the gun position is reduced to 1100mm, the stirring of a molten pool is enhanced by blowing for 85 seconds, the blowing is stopped after the whole-process oxygen supply blowing time reaches 13 minutes, the gun is lifted for deslagging, and the weight percentage of elements of molten steel after the blowing is finished is P:0.017%, C:0.160 percent, the temperature of molten steel is 1655 ℃, and the weight percentage of steel slag is SiO2:10.95%, caO:44.11%, TFe:18.63%.
Claims (1)
1. A method for smelting low-silicon molten iron slag by a converter is characterized in that a main blowing material is filled in the converter, and the main material consists ofThe weight percentage of the molten iron is 80.0-90.0 percent, the rest is scrap steel, then oxygen supply blowing is started, the gun position is controlled at 1400-1600mm in the early stage of blowing for 0-2min, the oxygen supply pressure is 0.84-0.88MPa, and the oxygen supply flow is 26000-28000m 3 /h; 0.10% of molten iron and silicon, fully leaving slag, adding 300-400 kg of magnesite during slag splashing, adding 500kg of lime after slag splashing, starting blowing, adding slag charge after carbon fire, and slowing down the sign of returning to a dry lance every time, wherein the integral height of a gun position is 200 mm; 0.05% of molten iron and silicon, fully leaving slag, adding 300-400 kg of magnesite during slag splashing, adding 300kg of lime after slag splashing, starting to blow, adding slag charge after firing with carbon and 100kg each time, and slowing down the signs of returning to a dry lance; in the final stage of blowing, constant pressure oxygen supply is maintained, the gun position is reduced to 110-120cm, the stirring of a molten pool is enhanced during the 85-95s of blowing, the blowing is stopped after the whole-course oxygen supply blowing time reaches 13-15min, and gun deslagging is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311379367.4A CN117344080A (en) | 2023-10-24 | 2023-10-24 | Method for smelting low-silicon iron hydrated slag by converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311379367.4A CN117344080A (en) | 2023-10-24 | 2023-10-24 | Method for smelting low-silicon iron hydrated slag by converter |
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| Publication Number | Publication Date |
|---|---|
| CN117344080A true CN117344080A (en) | 2024-01-05 |
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|---|---|---|---|
| CN202311379367.4A Pending CN117344080A (en) | 2023-10-24 | 2023-10-24 | Method for smelting low-silicon iron hydrated slag by converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117344080A (en) |
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- 2023-10-24 CN CN202311379367.4A patent/CN117344080A/en active Pending
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