CN114480772A - Process for recycling thermal refining slag in converter smelting process - Google Patents
Process for recycling thermal refining slag in converter smelting process Download PDFInfo
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- CN114480772A CN114480772A CN202210100654.6A CN202210100654A CN114480772A CN 114480772 A CN114480772 A CN 114480772A CN 202210100654 A CN202210100654 A CN 202210100654A CN 114480772 A CN114480772 A CN 114480772A
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- 239000002893 slag Substances 0.000 title claims abstract description 144
- 238000007670 refining Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000004064 recycling Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000005266 casting Methods 0.000 claims abstract description 34
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 3
- 238000005253 cladding Methods 0.000 claims abstract description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 12
- 239000004571 lime Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910000655 Killed steel Inorganic materials 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 238000007664 blowing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite 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
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 235000010855 food raising agent Nutrition 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
-
- 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
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- 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 discloses a process for recycling thermal refining slag in a converter smelting process, which belongs to the field of steelmaking and comprises the following steps: s1, molten steel obtained by an LF furnace enters a continuous casting process, the generated hot continuous casting ladle casting residual refined slag is divided into two parts for treatment, and aluminum particles and a low-carbon steel cladding covering agent are added into a slag pot; s2, conveying the slag pot to a feeding span, and pouring the thermal-state casting slag in the slag pot into a full-pot hot-metal ladle; s3, adding molten iron in the molten iron tank into the converter; and S4, refining the molten steel obtained in the converter in an LF furnace. Can solve the metal loss and the heat loss in the refining slag and reduce the steel-making cost.
Description
Technical Field
The invention relates to a steelmaking process technology, in particular to a process for recycling thermal refining slag.
Background
After the continuous casting of the molten steel is finished, refining slag in a ladle is inevitable. In the prior art, the refining slag of the continuous casting steel ladle casting is treated by two parts, wherein one part of molten steel is poured into a slag pot, the slag pouring is stopped after the molten steel flows, and the rest part of the refining slag and the molten steel are all folded into a refining ladle for recycling. Wherein the slag is poured into a slag pot part and transferred to a slag treatment process, and the cement is produced after treatment.
Although the subsequent slag treatment realizes reuse of the components of the refining slag, the following steps: firstly, the slag treatment process needs various measures such as hot stuffiness, disc splashing, roller, wind crushing and the like, and the equipment investment of the needed process is large; secondly, the slag treatment process needs to cool the liquid steel slag with high temperature of about 1600 ℃ to about 250 ℃, the cooling is mostly water medium, the water resource consumption is large, and the heat in the liquid steel slag causes practical waste.
In recent years, the recycling of the steel slag is also studied and applied in the technology, so that the energy conservation and consumption reduction and the greenhouse gas emission reduction are facilitated, the recycling proportion of the converter slag is improved, and valuable components such as Fe in the converter slag are effectively recovered. However, the difficulties of the internal circulation of the steel slag are as follows: firstly, the refined slag of continuous casting steel ladle casting has the phenomenon of solidification and crusting in a slag tank, the slag shell is broken in the slag pouring process, and a large amount of slag is gushed out to burn the molten iron car and the auxiliary equipment thereof; ② partial refining slag has incomplete deoxidation, and in the process of iron folding, C + FeO is Fe + CO reaction, so that the risk of slag overflow in the process of iron folding is existed. For the reasons, the small part of the refining slag mixed with the molten steel can be recycled at present, and the casting residue refining slag poured into the slag pot cannot be recycled.
In addition, the converter improves the amount of scrap steel, is beneficial to reducing the consumption of molten iron, greatly reduces the environmental pollution and the comprehensive energy consumption, and has higher economic, environmental protection and social benefits. However, after the amount of the scrap steel is increased, the heat of the converter is obviously insufficient, and the temperature raising agent needs to be added and the consumption of auxiliary materials needs to be reduced to meet the heat required by production. After the converter auxiliary materials are reduced, the converter slag amount is reduced, and meanwhile, the temperature of a molten pool in the early stage of blowing is lower, lime melting in the early stage is influenced, slag melting in the early stage of blowing is not facilitated, the dephosphorization efficiency of the converter is influenced, and the number of blast furnaces with phosphorus at the blowing end point is increased.
Disclosure of Invention
The technical task of the invention is to provide a process for recycling the thermal refining slag in the smelting process of the converter aiming at the defects of the prior art, so as to solve the problems of slag treatment cost and environmental pollution caused by the refining slag, solve the metal loss and heat loss in the refining slag and reduce the high steelmaking cost.
The technical scheme for solving the technical problem is as follows: a process for recycling hot refining slag in a converter smelting process is characterized by comprising the following steps: the method comprises the following steps:
s1, molten steel obtained by an LF furnace enters a continuous casting process, the produced hot continuous casting ladle casting residual refining slag is divided into two parts for treatment, one part of the molten steel is poured into a slag pot, the slag pouring is stopped after the molten steel flows, and the residual part of the refining slag and the molten steel are all folded into a refining ladle for recycling; wherein, after each casting residue refined slag enters the slag pot, aluminum particles are put into the slag pot; after the continuous casting residue is completely poured, adding 100-150kg of low-carbon steel cladding covering agent into the slag pot;
s2, conveying the slag pot to a feeding span, and pouring the thermal-state casting slag in the slag pot into a full-pot hot-metal ladle;
s3, adding molten iron in the molten iron tank into the converter;
and S4, refining the molten steel obtained in the converter in an LF furnace.
Furthermore, for low-carbon low-silicon aluminum killed steel, CaO-Al is selected for refining and slagging2O3And (4) slag system.
Further, the content of CaO in the slag is 50-60%, and Al is2O3The content is 28-33%.
Further, in step S2, the slag pot is transported to the charging bay through the bay lane.
Further, in step S3, 3 to 5 tons of hot casting slag are poured into each ladle of molten iron.
Further, in step S3, the number of furnaces is used for control.
Further, in step S3, the control of the number of furnaces used is specifically: the casting residue is continuously used in three furnaces in the same group of converters, and then the casting residue can be continuously used after the casting residue is converted into two furnaces for normal production.
Furthermore, the number of the furnaces for refining the casting residue is used, and 500-1000kg of lime is less added into each furnace.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. according to the method, the hot-state furnace slag is modified in the slag tank, so that the defect that the casting residue refining slag in the slag tank cannot enter internal circulation in the prior art is overcome, the internal recycling of the steel slag is realized, the use amount of slagging materials such as lime and fluorite is reduced, the slagging speed is improved, the corrosion resistance of refractory materials is reduced, the power consumption is reduced, meanwhile, the recycling of the steel ladle residue steel after pouring can be realized, and the metal yield is improved;
2. the method can solve the problem of low converter dephosphorization rate due to large steel scrap ratio, improve the dephosphorization rate by 5-7% under the condition of ensuring the unchanged steel scrap ratio, and reduce the lime consumption by 3-5kg per ton of steel under the condition of ensuring the dephosphorization effect;
3. the method carries out thermal state recovery on the continuous casting residue, and reduces the consumption of the converter steel material;
4. the method is suitable for all converters, and has wide application range and high popularization value.
Drawings
FIG. 1 is a schematic view of the internal circulation of converter slag according to the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The invention relates to a process for recycling hot refining slag in a converter smelting process, which fully utilizes the physical heat of the refining slag and reduces the influence of adding cold refining slag on the temperature in the early stage of converter blowing.
The utilization of the LF refining slag in the thermal state in the converter smelting process is shown in figure 1 and comprises the following steps:
s1, molten steel obtained by an LF furnace enters a continuous casting process, the produced hot continuous casting ladle casting residual refining slag is divided into two parts for treatment, one part of the molten steel is poured into a slag pot, the slag pouring is stopped after the molten steel flows, and the residual part of the refining slag and the molten steel are all folded into a refining ladle for recycling.
In the step, for low-carbon low-silicon aluminum killed steel, in order to ensure that LF refining slag has desulfurization and adsorption inclusion and simultaneously avoid molten steel from returning silicon, CaO-Al is selected for refining slagging2O3And (4) slag system. CaO content in LF refining slag is 50-60%, Al2O328-33% of Al2O3Can form a low-melting-point compound with CaO, and can be used as a cosolvent in the converter steelmaking process.
The following table shows the composition of the refined slag for each example:
| internal steelSeed of a species of rice | CaO | SiO2 | FeO | Al2O3 | MgO | CaO/SiO2(R) |
| H01301 | 58.4 | 3.3 | 0.6 | 30.0 | 5.5 | 17.7 |
| H01301 | 57.6 | 3.8 | 1.6 | 29.4 | 4.9 | 15.2 |
| H01301 | 58.1 | 3.6 | 1.0 | 29.0 | 5.8 | 16.0 |
| H01301 | 56.6 | 2.5 | 1.1 | 34.4 | 5.8 | 22.3 |
| H01301 | 60.0 | 2.6 | 0.7 | 30.3 | 5.1 | 22.9 |
| H01301 | 57.5 | 3.2 | 2.0 | 30.6 | 5.1 | 17.8 |
The charging amount of the following slag tanks is based on 25-30 tons of refining slag stored in each slag tank, and each slag tank can be used for casting residual refining slag for 6-7 times, namely the amount of the residual refining slag in each casting is 4-5 tons.
After the continuous casting residue is poured, adding 150kg of 100-plus-150 kg low-carbon ladle covering agent into the slag pot to solve the problem of crust formation on the surface of the slag pot and prevent the slag pot from being broken by impact in the later slag pouring process, and a large amount of slag from rushing out to burn out the molten iron car and the accessory equipment thereof.
If the steel grade produced by the deoxidation incomplete steel grade, such as the steel grade produced by the BOF-RH-CC production process, the obtained refining slag has incomplete deoxidation, and during the iron folding process, the C + FeO ═ Fe + CO reaction occurs, so that the risk of slag production during the iron folding process exists. After the casting residue refined slag enters the slag tank each time, aluminum particles are put into the slag tank to perform the deoxidation of the refined slag. The total amount of each slag pot is 30-50 kg.
Heavy type steel scraps are added into converter steel scraps, and the difficulty in melting the steel scraps is increased due to low early-stage blowing temperature. Therefore, after the casting residue refining slag enters the slag pot, 500kg of lime powder with 400 weight is added into the slag pot, the total amount of the lime powder added into each slag pot is controlled to be 2-3 tons, the alkalinity of the refining slag is improved, the addition of the lime is reduced in the early stage of converter blowing, and the blowing precondition temperature is improved.
The method is not beneficial to the scrap steel melting in the blast furnace production process because the molten iron silicon is low and the temperature is low after the scrap steel added into the molten iron tank is melted in the blast furnace tapping process, and the molten iron temperature is commonly 1230-1260 ℃. Partial heats need to increase ferrosilicon to the stove and heat up, but ferrosilicon adds in the converting process, leads to converter converting splash easily, is unfavorable for converting operation process control. If ferrosilicon with the silicon content of 75 percent is put into the molten iron, the melting point of the ferrosilicon is 1300-1330 ℃, the recovery rate of the added ferrosilicon is only about 60-80 percent, and the ferrosilicon which can not be melted in time is easy to cause tank sticking or the ferrosilicon floats on the iron flow to increase the burning loss. In this case, ferrosilicon containing 75% silicon is added to the slag pot, preferably 200-300kg of refined slag per casting. The temperature of molten steel in a ladle in the later period of continuous casting is more than 1560 ℃, and the high-temperature continuous casting residual refined slag is beneficial to melting the ferrosilicon. Liquid silicon is dissolved in liquid slag and when the silicon concentration is 1%, its standard free energy is: si (l) ([ Si ] Delta Gsi theta) (-131500-17.61T), it can be seen that the dissolution of silicon is always an exothermic reaction, it can make up the heat absorption and heat dissipation loss of ferrosilicon in the process of silicon increasing, and at the same time can make up the temperature drop of lime powder. By increasing the silicon content in the refining slag, the refining slag is folded into the hot-metal ladle, the silicon content in the hot-metal ladle can be increased, and the recovery rate of the silicon iron is improved.
S2, the slag tank is conveyed to a charging span through a cross-over lane, and the thermal-state casting residue in the slag tank is poured into a full-tank hot metal ladle.
In the step, 3-5 tons of hot casting residue is poured into each pot of molten iron. The specification of the hot metal ladle in this embodiment is 300 tons.
And S3, adding the molten iron in the molten iron tank into the converter.
The hot refining slag is poured into the converter along with the molten iron, so that the slagging can be promoted, the dephosphorization rate of the converter can be improved, and the consumption of auxiliary materials can be reduced. Can solve the problem that the cold refining slag is added to influence the earlier-stage scrap melting because the converter blowing precondition temperature is low due to the large scrap ratio.
The refining slag contains about 30 percent of Al2O3This part of Al2O3The melting point of the slag can be reduced, which is beneficial to slag melting, but the slag with low melting point and low viscosity is stirred in a molten pool due to slag denaturation, so that the erosion of the converter lining is serious. Therefore, the number of the used furnaces needs to be reasonably controlled, the casting residues are continuously used in three furnaces of the same group of converters and then converted into two furnaces for normal production, and the casting residues can be continuously used to ensure that the corrosion of the converter lining is controlled.
The refining casting residue is used for a plurality of times, and each furnace is added with less than 500-1000kg of lime. The converter specification in this example was 300 tons.
And S4, refining the molten steel obtained in the converter in an LF furnace.
According to the method, the hot-state furnace slag is modified in the slag tank, so that the defect that the casting residue refining slag in the slag tank cannot enter internal circulation in the prior art is overcome, the internal recycling of the steel slag is realized, the use amount of slagging materials such as lime and fluorite is reduced, the slagging speed is improved, the corrosion resistance of refractory materials is reduced, the power consumption is reduced, meanwhile, the recycling of the steel ladle residue steel after pouring can be realized, and the metal yield is improved; the method can also solve the problem of low converter dephosphorization rate due to large steel scrap ratio, improve the dephosphorization rate by 5-7% under the condition of ensuring the unchanged steel scrap ratio, and reduce the lime consumption by 3-5kg per ton of steel under the condition of ensuring the dephosphorization effect. The continuous casting residue is subjected to thermal state recovery, and the consumption of the converter steel material is reduced.
The method is suitable for all converters, and has wide application range and high popularization value.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes in the invention can be made therein without departing from the spirit and scope thereof.
Claims (8)
1. A process for recycling hot refining slag in a converter smelting process is characterized by comprising the following steps: the method comprises the following steps:
s1, molten steel obtained by an LF furnace enters a continuous casting process, the produced hot continuous casting ladle casting residual refining slag is divided into two parts for treatment, one part of the molten steel is poured into a slag pot, the slag pouring is stopped after the molten steel flows, and the residual part of the refining slag and the molten steel are all folded into a refining ladle for recycling; wherein, after each casting residue refined slag enters the slag pot, aluminum particles are put into the slag pot; after the continuous casting residue is completely poured, adding 100-150kg of low-carbon steel cladding covering agent into the slag pot;
s2, conveying the slag pot to a feeding span, and pouring the thermal-state casting slag in the slag pot into a full-pot hot-metal ladle;
s3, adding molten iron in the molten iron tank into the converter;
and S4, refining the molten steel obtained in the converter in an LF furnace.
2. The process for recycling the thermal refining slag in the converter smelting process according to claim 1, which is characterized in that: for low-carbon low-silicon aluminum killed steel, CaO-Al is selected for refining and slagging2O3And (4) slag system.
3. The process for recycling the thermal refining slag in the converter smelting process according to claim 1, which is characterized in that: the CaO content of the slag is 50-60 percent, and Al2O3The content is 28-33%.
4. The process for recycling the thermal refining slag in the converter smelting process according to claim 1, which is characterized in that: in step S2, the slag pot is transported to the charging bay by crossing the roadway.
5. The process for recycling the thermal refining slag in the converter smelting process according to claim 1, which is characterized in that: in step S3, 3 to 5 tons of hot casting slag are poured into each ladle of molten iron.
6. The process for recycling the thermal refining slag in the converter smelting process according to claim 1, which is characterized in that: in step S3, the control uses the number of furnaces.
7. The process for recycling the thermal refining slag in the converter smelting process according to claim 6, which is characterized in that: in step S3, the control of the number of furnaces used is specifically: the casting residue is continuously used in three furnaces in the same group of converters, and then the casting residue can be continuously used after the casting residue is converted into two furnaces for normal production.
8. The process for recycling the thermal refining slag in the converter smelting process according to claim 7, which is characterized in that: the number of the furnaces for refining the casting residue is reduced by adding 500-1000kg of lime in each furnace.
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| CN113088800A (en) * | 2021-04-15 | 2021-07-09 | 天津市新天钢钢铁集团有限公司 | Method for recycling refining slag and molten steel casting residue of low-carbon aluminum killed steel LF furnace |
| CN113102712A (en) * | 2021-04-15 | 2021-07-13 | 马鞍山钢铁股份有限公司 | Steel ladle casting residue recycling method suitable for ultra-low carbon steel |
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2022
- 2022-01-27 CN CN202210100654.6A patent/CN114480772A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| EP2213753A1 (en) * | 2009-02-02 | 2010-08-04 | AKADEMIA GORNICZO-HUTNICZA im. Stanislawa Staszica | Method of production of a slag-forming compound for secondary steel refining in a ladle or ladle furnace |
| CN105506226A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Method for carrying out pre-desiliconization, pre-decarburization and pre-dephosphorization on molten iron in molten iron tank |
| CN109852764A (en) * | 2019-04-01 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of LF refining top slag thermal state utilization method |
| CN111349743A (en) * | 2020-03-30 | 2020-06-30 | 包头钢铁（集团）有限责任公司 | Energy-saving and emission-reducing method for recycling thermal-state casting residues |
| CN113088800A (en) * | 2021-04-15 | 2021-07-09 | 天津市新天钢钢铁集团有限公司 | Method for recycling refining slag and molten steel casting residue of low-carbon aluminum killed steel LF furnace |
| CN113102712A (en) * | 2021-04-15 | 2021-07-13 | 马鞍山钢铁股份有限公司 | Steel ladle casting residue recycling method suitable for ultra-low carbon steel |
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