CN114959164B - Quick slag discharging method for double-slag smelting of converter - Google Patents
Quick slag discharging method for double-slag smelting of converter Download PDFInfo
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- CN114959164B CN114959164B CN202210808821.2A CN202210808821A CN114959164B CN 114959164 B CN114959164 B CN 114959164B CN 202210808821 A CN202210808821 A CN 202210808821A CN 114959164 B CN114959164 B CN 114959164B
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- 239000002893 slag Substances 0.000 title claims abstract description 177
- 238000007599 discharging Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000003723 Smelting Methods 0.000 title claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 104
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 229910052742 iron Inorganic materials 0.000 claims abstract description 51
- 230000004907 flux Effects 0.000 claims abstract description 31
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000000428 dust Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000005187 foaming Methods 0.000 description 4
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000143432 Daldinia concentrica Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a quick slag discharging method for double slag smelting of a converter, which comprises the following steps: 1) Slag-retaining operation: the end point oxygen value of the previous converter is controlled below 800ppm, slag splashing furnace protection is carried out, and the slag pouring angle is controlled between 165 and 175 degrees; 2) Reducing the addition amount of scrap steel, adding more than 3.8 kg/ton iron-carbon balls into the scrap steel, wherein the scrap steel does not contain steel slag, and the corresponding temperature drop is less than 20 ℃; shaking the furnace for more than two times; the speed is less than 5t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, iron ore is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting; 3) Smelting before slag discharge: the addition amount of the flux before slag discharge accounts for 25% -35% of the total flux amount of the whole furnace, and the flux before slag discharge is added in two times; 4) And after the gun is lifted, immediately feeding iron-carbon spheres and iron ore into the furnace, and operating the furnace by shaking. The advantages are that: the method realizes rapid slag formation and the purpose of separating the iron slag rapidly by a simple and efficient method.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and relates to a quick slag discharging method for double slag smelting of a converter.
Background
The double slag smelting of the converter is one of the production methods of the converter, is more commonly used in high-silicon molten iron smelting and low-phosphorus steel smelting, has the slag-discharging and iron-carrying condition during double slag smelting, causes the loss of steel materials, and can not achieve the purpose of slag discharging and dephosphorization, especially when the low-silicon molten iron needs double slag smelting, the slag-discharging and iron-carrying difficulty condition is more common because slag is difficult to form slag with better fluidity before slag discharging, and the problems of difficult slag discharging caused by slag separation and steel during the low-silicon molten iron are solved.
In the prior art, for example: chinese patent application No.: 200910243175.4 an automatic control method for double slag operation of a converter is disclosed, and automatic control of the converter for producing low-P molten steel by using high-Si molten iron is realized; chinese patent application No.: 201410277535.3A method for converter double slag steelmaking is disclosed, which can reduce the phosphorus content in semisteel to a very low level; the technical scheme does not provide a related solution to the problems of poor separation of slag and iron and slower slag formation in the production of low-silicon molten iron.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a quick slag discharging method for double-slag smelting of a converter, which realizes quick slag formation and quick separation of slag and iron, can effectively reduce slag discharging and iron carrying, realizes quick slag discharging and improves economic indexes in converter production.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a method for rapidly discharging slag in double slag smelting of a converter comprises the following steps:
1) Slag-retaining operation: the oxygen value of the end point of the previous converter is controlled below 800ppm, slag splashing is carried out for protecting the converter, the slag splashing time is controlled between 3 and 4 minutes, the slag pouring angle for slag pouring operation is controlled between 165 and 175 degrees, and the slag remaining amount is controlled between 7.6 kg/ton steel and 15.2 kg/ton steel;
2) Reducing the addition amount of the scrap steel, wherein the corresponding temperature drop is less than 20 ℃, and the scrap steel does not contain steel slag; after the scrap steel is added into the converter, the converter is rocked back and forth for more than two times, and slag left in the converter is evenly paved on the surface of the scrap steel; the speed is less than 5t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, 1.5-2.5 kg/ton of iron ore of steel is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting after no flame in the furnace is calm;
3) Smelting before slag discharge: the addition amount of the flux before slag discharge is 25-35% of the total flux amount of the whole furnace, the flux before slag discharge is added in two times, the first flux and 1-3 kg/ton iron carbon ball of steel are added after the oxygen lance is put down to the lance for striking fire, and the second flux is added between 60s and 120s after smelting begins;
the oxygen lance position before slag discharge adopts a low-high-low principle, the blowing lance position is lowered to 220-230 cm, the lance position is firstly raised to 250-260 cm after successful ignition, and the lance position is lowered to 220-230 cm until slag discharge after stable reaction in the furnace; when converting for 200-300 s, raising a gun and discharging slag;
4) Slag discharge operation: after gun lifting, 1.2-1.4 kg/ton iron-carbon balls are immediately put into the furnace, 0.5-1.5/ton iron ore of steel is added into the furnace, and then-30-DEG shaking operation is carried out.
The iron-carbon ball comprises the following components in percentage by mass: fe:60% -65%, C:10% -20%, wherein the iron ore comprises the following components in percentage by mass: fe is more than or equal to 60%, siO 2 ≥1％，Al 2 O 3 More than or equal to 1 percent, and the balance of impurities.
In the step 4), if foam slag in the converter is found not to overflow from the converter mouth in a violent reaction manner in the pouring process, the converter shakes to a zero position, iron carbon balls of 1.2-1.4 kg/ton of steel are continuously added into the converter once, and then iron ores of 0.5-1.5 kg/ton of steel are added.
Compared with the prior art, the invention has the beneficial effects that:
when low-silicon molten iron with Si content less than 0.3% needs double slag smelting, the slag before slag tapping is difficult to form, so that the slag tapping difficulty is more common, and slag tapping after reblowing is forced to be needed. The method provided by the invention realizes rapid slag formation by a simple and efficient method, realizes the purpose of separating quicker slag and iron, can effectively reduce slag discharge with iron, does not see smoke dust in a slag pot for holding slag below the converter, and shortens the slag discharge time by 1-5 min.
Detailed Description
The present invention will be described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The quick slag discharging method for double slag smelting of the converter comprises the following steps:
1) Slag-retaining operation: the slag-retaining operation means that after the slag-splashing protection of the converter is finished, all or part of slag used in the previous smelting is actively retained in the converter during the slag-pouring operation, the slag-retaining operation can play a role in rapid melting, and the melting of materials in the converter such as active lime and the like is accelerated, so that foam slag is rapidly formed. However, in order to prevent the high oxygen value of the final slag of the converter from causing the splashing of the added iron, the oxygen value of the final point of the converter of the previous converter is controlled below 800ppm, slag splashing is carried out to ensure a certain slag splashing time, the slag splashing time is controlled to be 3-4 min, proper slag needs to be reserved, excessive smelting of the converter is not easy to control to cause the splashing, too little slag splashing can not be accelerated, the slag reserving quantity is controlled by controlling the slag pouring angle, the slag pouring angle of the slag pouring operation is controlled to be 165-175 degrees, and the slag reserving quantity is controlled to be 7.6 kg/ton steel-15.2 kg/ton steel;
2) Calculating the heat balance of the converter according to the tapping temperature requirement, the raw material condition and the system temperature condition, and reducing the adding amount of the scrap steel, wherein the principle is that the corresponding temperature drop is less than 20 ℃, the actual adding amount of the scrap steel is reduced by more than 15 kg/ton steel compared with the design amount, and the scrap steel is free of steel slag in order to prevent the splashing of the added iron; after the scrap steel is added into the converter, the converter is rocked back and forth for more than two times, so that slag remained in the converter is uniformly paved on the surface of the scrap steel; the speed is less than 5t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, 1.5-2.5 kg/ton of iron ore of steel is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting after no flame in the furnace is calm;
3) Smelting before slag discharge: the addition amount of the flux before slag discharge is 25-35% of the total flux amount of the whole furnace, the flux before slag discharge is added in two times, the first flux and 1-3 kg/ton iron carbon ball of steel are added after the oxygen lance is put down to the lance for striking fire, and the second flux is added between 60s and 120s after smelting begins;
the oxygen lance position before slag discharge adopts a low-high-low principle, the blowing lance position is lowered to 220-230 cm, the lance position is firstly raised to 250-260 cm after successful ignition, and the lance position is lowered to 220-230 cm until slag discharge after stable reaction in the furnace; when converting for 200-300 s, raising a gun and discharging slag;
4) Slag discharge operation: after gun lifting, 1.2-1.4 kg/ton iron-carbon balls are immediately put into the furnace, then 0.5-1.5 kg/ton iron ore is added into the furnace, and then-30-DEG shaking furnace operation is carried out. If foam slag in the converter is found not to overflow from the converter mouth in a violent reaction manner in the pouring process, the converter shakes to a zero position, iron-carbon balls of 1.2-1.4 kg/ton of steel are continuously added into the converter once, and then iron ore of 0.5-1.5 kg/ton of steel is added.
The iron-carbon sphere comprises the following components in percentage by mass: fe:60% -65%, C:10% -20%, wherein the iron ore comprises the following components in percentage by mass: fe is more than or equal to 60%, siO 2 ≥1％，Al 2 O 3 More than or equal to 1 percent, the rest isAnd (5) impurities.
Example 1
The quick slag discharging method for double slag smelting of the converter comprises the following steps:
1) 260 ton converter, molten iron silicon content 0.2%, scrap 35 ton, iron-carbon ball total 2 ton.
2) Slag-retaining operation: the end point oxygen value of the converter is controlled at 500ppm, slag splashing is carried out, the slag splashing time is controlled at 3.5min, the slag splashing angle for slag splashing operation stays at 170 DEG, and the slag remaining amount is controlled at 3 tons;
3) The high-level bin of the converter prepares iron-carbon spheres and iron ore in advance, wherein the iron-carbon spheres comprise the following components in percentage by mass: fe:63%, C:15 percent and the rest are impurities, wherein Fe in the iron ore is more than or equal to 60 percent, siO 2 ≥1％，Al 2 O 3 More than or equal to 1 percent, and the balance of impurities.
The steel scraps are free of sealing objects, steel slag and the like, and are dried; adding iron after adding the scrap steel, and shaking the converter for 3 times after adding the scrap steel; the speed is 4t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, 500kg of iron ore is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting after no flame in the furnace is calm;
4) Smelting before slag discharge: before slag discharge, 3 tons of flux is added, the flux is added in two times, 1.5 tons of flux and 1 ton of iron-carbon ball are added after the oxygen lance is fired, the residual flux is added in 90 seconds, and the residual iron-carbon ball of 1.5 tons is added in the slag discharge process; the oxygen lance position before slag discharge adopts a low-high-low principle, the blowing lance position is lowered to 220cm, the lance position is firstly raised to 250cm after successful ignition, and the lance position is lowered to 220cm until slag discharge after stable reaction in the furnace; raising a gun and discharging slag when converting for 250 s;
5) Slag discharge operation: after gun lifting, 300kg of iron-carbon balls and 250kg of iron ore are immediately put into the converter, and then-30-degree shaking operation is carried out, for example, the foaming slag degree in the converter is found to be poor in the process of pouring the converter or the converter is found to be inactive in the converter, the shaking value of the converter is zero, and 300kg of iron-carbon balls are continuously put into the converter once until the foaming slag can react violently and continuously overflow from the mouth of the converter.
6) After the gun is lifted, active foam slag of slag in the converter can overflow out of a furnace mouth, no smoke dust is seen in a slag tank under the converter in the process of pouring and discharging slag, 1098kg/t of steel materials is obtained, and the slag discharging time is 4.3min.
Comparative example 1
The quick slag discharging method for double slag smelting of the converter comprises the following steps:
1) 260 ton converter, molten iron silicon content 0.21%, scrap steel 38 ton.
2) Smelting before slag discharge: 3 tons of flux is added before slag discharge, the flux is added after a gun is fired, and the residual flux is added at 96 s; the oxygen lance position before slag discharge adopts a low-high principle, the blowing lance position is lowered to 221cm, the lance position is firstly lifted to 252cm after successful ignition, and the lance position is lifted to 283cm until slag discharge after stable reaction in the furnace; gun lifting and slag discharging are carried out when 220s of blowing is carried out;
3) Slag discharge operation: after gun lifting, slag in the converter is inactive, foam slag is not seen to overflow the mouth of the converter, a large amount of smoke dust is seen in a slag pot which is arranged below the converter and holds slag in the slag discharging process of the converter, the serious iron carrying is indicated, and the slag discharging time is 9.3min after 1102kg/t of steel materials are counted.
Example 2
The quick slag discharging method for double slag smelting of the converter comprises the following steps:
1) 260 ton converter, molten iron silicon content 0.1%, scrap 25 ton, iron-carbon ball total 3 ton.
2) Slag-retaining operation: the end point oxygen value of the converter is controlled at 600ppm, slag splashing is carried out, the slag splashing time is controlled at 3.7min, the slag splashing angle for slag splashing operation stays at 165 DEG, and the slag remaining amount is controlled at 4 tons;
3) The high-level bin of the converter prepares iron-carbon spheres and iron ore in advance, wherein the iron-carbon spheres comprise the following components in percentage by mass: fe:63%, C:15 percent and the rest are impurities, wherein Fe in the iron ore is more than or equal to 60 percent, siO 2 ≥1％，Al 2 O 3 More than or equal to 1 percent, and the balance of impurities.
The steel scraps are free of sealing objects, steel slag and the like, and are dried; adding iron after adding the scrap steel, and shaking the converter for 3 times after adding the scrap steel; the speed is 4t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, 750kg of iron ore is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting after no flame in the furnace is calm;
4) Smelting before slag discharge: before slag discharge, 3 tons of flux is added, the flux is added in two times, 1.5 tons of flux and 2 tons of iron-carbon balls are added after the oxygen lance is used for discharging the oxygen lance and the rest flux is added in 85 seconds, and the rest 1 ton of iron-carbon balls are added in the slag discharge process; the oxygen lance position before slag discharge adopts a low-high-low principle, the blowing lance position is lowered to 230cm, the lance position is lifted to 265cm after successful ignition, and the lance position is lowered to 230cm until slag discharge after stable reaction in the furnace; gun lifting and slag discharging are carried out when blowing is carried out for 240 s;
5) Slag discharge operation: after gun lifting, 330kg of iron-carbon balls and 500kg of iron ore are immediately put into the converter, and then-30-degree shaking operation is carried out, for example, the foaming slag degree in the converter is found to be poor in the process of pouring the converter or the converter is found to be inactive in the converter, the shaking value of the converter is zero, and 330kg of iron-carbon balls are continuously put into the converter once until the foaming slag can react violently and continuously overflow from the mouth of the converter.
6) After the gun is lifted, active foam slag of slag in the converter can overflow out of a furnace mouth, no smoke dust is seen in a slag tank under the converter in the process of pouring and discharging slag, 1099kg/t of steel is used, and the slag discharging time is 4.6min.
Comparative example 2
The quick slag discharging method for double slag smelting of the converter comprises the following steps:
1) 260 ton converter, molten iron silicon content 0.12%, scrap 30 ton.
2) Smelting before slag discharge: the addition amount of the flux is 3 tons before slag discharge, and the flux is added once after blowing and firing; the oxygen lance position before slag discharge adopts the principle of high-low-high-low, the lance position is opened for 260cm, then the lance position is reduced to 220cm, the reaction is calm and firstly carried to 265cm, the flame in the furnace is contracted into the furnace mouth, and the lance position is reduced to 230cm until slag discharge; raising a gun and discharging slag when converting for 250 s;
3) Slag discharge operation: after gun lifting, foam slag is not found in the converter, a large amount of smoke dust is visible in a slag pot under the converter in the slag discharging process of the converter, 1106kg/t of steel materials is obtained, and the slag discharging time is 9.5min.
Claims (2)
1. The quick slag discharging method for double slag smelting of the converter is characterized by comprising the following steps of:
1) Slag-retaining operation: the oxygen value of the end point of the previous converter is controlled below 800ppm, slag splashing is carried out for protecting the converter, the slag splashing time is controlled between 3 and 4 minutes, the slag pouring angle for slag pouring operation is controlled between 165 and 175 degrees, and the slag remaining amount is controlled between 7.6 kg/ton steel and 15.2 kg/ton steel;
2) Reducing the addition amount of the scrap steel, wherein the corresponding temperature drop is less than 20 ℃, and the scrap steel does not contain steel slag; after the scrap steel is added into the converter, the converter is rocked back and forth for more than two times, and slag left in the converter is evenly paved on the surface of the scrap steel; the speed is less than 5t/s in the process of iron charging, the furnace is rocked back and forth after the iron charging is finished, 1.5-2.5 kg/ton of iron ore of steel is added into the furnace, the furnace is rocked back and forth, and the oxygen lance is used for converting after no flame in the furnace is calm;
3) Smelting before slag discharge: the addition amount of the flux before slag discharge is 25-35% of the total flux amount of the whole furnace, the flux before slag discharge is added in two times, the first flux and 1-3 kg/ton iron carbon ball of steel are added after the oxygen lance is put down to the lance for striking fire, and the second flux is added between 60s and 120s after smelting begins;
the oxygen lance position before slag discharge adopts a low-high-low principle, the blowing lance position is lowered to 220-230 cm, the lance position is firstly raised to 250-260 cm after successful ignition, and the lance position is lowered to 220-230 cm until slag discharge after stable reaction in the furnace; when converting for 200-300 s, raising a gun and discharging slag;
4) Slag discharge operation: immediately feeding 1.2-1.4 kg of iron-carbon balls per ton of steel into the furnace after gun lifting, adding 0.5-1.5 per ton of iron ore per ton of steel into the furnace, and then performing-30-DEG shaking operation;
the iron-carbon ball comprises the following components in percentage by mass: fe:60% -65%, C:10% -20%, wherein the iron ore comprises the following components in percentage by mass: fe is more than or equal to 60%, siO 2 ≥1%，Al 2 O 3 More than or equal to 1 percent, and the balance of impurities.
2. The method for rapidly discharging slag in double slag smelting of a converter according to claim 1, wherein in the step 4), if foam slag in the converter is found not to overflow from the mouth of the converter in a violent reaction during the pouring process, the converter shakes to a zero position, iron-carbon balls of 1.2-1.4 kg/ton of steel are continuously added into the converter once, and then iron ore of 0.5-1.5 kg/ton of steel is added.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210808821.2A CN114959164B (en) | 2022-07-11 | 2022-07-11 | Quick slag discharging method for double-slag smelting of converter |
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| CN114959164B true CN114959164B (en) | 2023-11-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888487A (en) * | 2012-10-12 | 2013-01-23 | 武汉钢铁(集团)公司 | High-efficiency remaining slag smelting method of converters |
| CN107034334A (en) * | 2017-05-10 | 2017-08-11 | 攀钢集团攀枝花钢铁研究院有限公司 | The double slag melting methods of half steel of the quick slagging of falling stove |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
-
2022
- 2022-07-11 CN CN202210808821.2A patent/CN114959164B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888487A (en) * | 2012-10-12 | 2013-01-23 | 武汉钢铁(集团)公司 | High-efficiency remaining slag smelting method of converters |
| CN107034334A (en) * | 2017-05-10 | 2017-08-11 | 攀钢集团攀枝花钢铁研究院有限公司 | The double slag melting methods of half steel of the quick slagging of falling stove |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN111719032A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Converter less-slag smelting method |
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| CN114959164A (en) | 2022-08-30 |
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