CN106811576A - Converter slag thermal state recycling method - Google Patents
Converter slag thermal state recycling method Download PDFInfo
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- CN106811576A CN106811576A CN201510870406.XA CN201510870406A CN106811576A CN 106811576 A CN106811576 A CN 106811576A CN 201510870406 A CN201510870406 A CN 201510870406A CN 106811576 A CN106811576 A CN 106811576A
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- Prior art keywords
- slag
- converter
- ladle
- molten steel
- steel
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- 239000002893 slag Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004064 recycling Methods 0.000 title abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 14
- 238000005275 alloying Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011574 phosphorus Substances 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 abstract 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 abstract 1
- 229910052814 silicon oxide Inorganic materials 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 235000021321 essential mineral Nutrition 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 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
- 239000004035 construction material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a thermal state recycling method of converter slag, wherein the slag discharge amount is not controlled in the converter tapping process, and a slag reducing agent is uninterruptedly added to the inner slag surface of a steel ladle in the process of pouring the slag back into the steel ladle; the high-temperature area formed by heating the LF electrode is utilized to realize the chemical reaction of the slag reducing agent and the phosphorus, silicon, manganese and iron oxide in the slag, and simultaneously bottom blowing stirring is carried out, wherein the gas flow is 0.04-0.12 Nm3H.t, the stirring time is 5-20 min; after the slag is fully reduced, alloying treatment is carried out on the molten steel according to the influence of the reduced slag on the phosphorus, silicon and manganese components of the molten steel and the steel grade requirement; and after the pouring is finished, pouring the hot casting residue onto the surface of the molten iron after slagging off, and adding the hot casting residue into a converter along with the molten iron. The invention not only saves the alloy consumption and the steel material consumption in the molten steel alloying process, but also saves the slag material consumption in the reduction refining process, and realizes the thermal state recycling of the converter slag.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of hot circulation utilization method of vessel slag.
Background technology
Vessel slag is to produce most solid waste in convertor steelmaking process, is also that iron and steel enterprise can develop
Precious resources.The mineral structure of vessel slag depends primarily on chemical composition, when the basicity of slag
(CaO/SiO2)<When 1.8, essential mineral is CMS (forsterite), C3MS2(manganolite)；Basicity is
During 1.8-2.5, essential mineral is C2S (dicalcium silicate), C2F (dicalcium ferrite) and RO phases (Fe based on FeO,
Mn, Mg bivalent metal oxide solid solution)；When basicity is more than 2.5, essential mineral is C3S (tricalcium silicate),
C2S、C2F and RO phases, also contain a small amount of free calcium oxide in addition in slag, typical converter slag ingredient is such as
Following table.
The typical converter slag ingredient of table 1, %
| CaO | MgO | MnO | FeO | S | |||
| 40-50 | 10-15 | 8-10 | 1-3 | 0.5-1.5 | 15-25 | <2 | <0.1 |
At present, domestic steel mill's vessel slag is reclaimed and mainly include two kinds of techniques of cold conditions recovery and hot recovery.Cold conditions is returned
Receive and generally use drum process and hot vexed method technique, with taking up an area that small, treatment effeciency is high, slag sluicing system more thoroughly,
The features such as tailing particles are small, with reference to current slag micro powder technology, can effectively reclaim the iron money in vessel slag
Source, while producing construction material.Hot recovery mainly include converter double slag, duplexs and stay slag technique, Ji Jiangshang
The vessel slag that one stove is smelted stays a part that the smelting of next stove is participated in stove, is had using molten state vessel slag
Slag characteristic, higher alkalisation, higher oxygen etc., realize the rapid slagging of steelmaking process and save slag charge disappearing
Consumption, the part that this technique realizes vessel slag recycles.
The content of the invention
It is an object of the invention to provide a kind of hot circulation utilization method of vessel slag, i.e., gone back by vessel slag
Original place is managed, and desulfurization, deoxidation treatment is carried out to molten steel using the vessel slag after reduction, while can also be to vessel slag
In beneficial element and ferro element reclaimed, it can in addition contain by the vessel slag after reduction come back to converter after
It is continuous to recycle.
A kind of hot circulation utilization method of vessel slag, its technical scheme includes：
(1) converter tapping process does not control the lower quantity of slag, the molten steel in converter is all entered in ladle as far as possible, while
A part of molten state vessel slag in converter is set to enter in ladle, it is ensured that the ratio of the quantity of slag and Metal Weight is
0.005-0.02, during slag is reversed to ladle introversion, adds slag to the top of the slag in ladle incessantly
Reducing agent.
(2) ladle is transported to LF treating stations after converter tapping terminates, the high-temperature region reality formed using LF heated by electrodes
Existing slag reduction agent and phosphorus, silicon, manganese, the chemical reaction of ferriferous oxide in slag, while using bottom blowing stirring gas
Body is stirred, and gas flow is 0.04Nm3/ ht~0.12Nm3/ ht, mixing time is 5min-20min.
(3) after slag is reduced sufficiently, Bottom Blowing Gas Flow Rate to 0.25Nm is increased3/ ht~0.40Nm3/ ht, profit
Reduction refining is carried out to molten steel with slag, molten steel desulfurizing, deoxy technology requirement is met, while according to slag reduction
Afterwards to molten steel phosphorus, silicon, the influence of manganese composition and steel grade requirement, Alloying Treatment is carried out to molten steel, wait molten steel into
Upper machine after meeting requirement with temperature is divided to cast.
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, more than hot casting
The molten iron surface that slag is poured into after skimming, is hereafter blended into converter with molten iron.(P in due to thermal slag2O5)
(SiO2) be partially reduced, therefore there is slag high alkalinity, high phosphorus to hold and the features such as molten state, Ke Yican
With the dephosphorisation reaction in converter, the consumption of converter slag-making material is saved, while converter rapid slagging can be realized, shortened
The converter producing time.
A kind of hot circulation utilization method of vessel slag as described above, it is characterised in that：Molten steel stirring gas can be with
It is Ar, N2、CO2In one or more.
A kind of hot circulation utilization method of vessel slag as described above, it is characterised in that：Slag reduction agent it is main
Component can be one or more of aluminium, carbon, calcium, and the addition of slag reduction agent meets can be converter
The oxide Restore All of phosphorus, silicon, iron, manganese in slag is simple substance.
The present invention has the advantages that compared with prior art：
Reduced by by the phosphorus in slag, silicon, manganese, ferriferous oxide, on the one hand can realized to having in vessel slag
The recovery of beneficial element and ferro element, saves the alloy consumption and steel technology of molten steel alloying process, another
Aspect can also carry out reduction essence to molten steel using the high alkalinity of slag, low oxidative and melting characteristic after reduction
Refining, saves the slag charge consumption of reduction refining process, and the slag after reduction can also be returned in converter and is continuing with,
Realize that the hot of vessel slag is recycled.
Specific embodiment
Embodiment 1：
(1) converter tapping quantity 250t, tapping process does not control the lower quantity of slag, the molten steel in converter is all entered as far as possible
In entering ladle so that during a part of molten state vessel slag pours into ladle in converter, the quantity of slag is 2.1t in ladle,
During slag is reversed to ladle introversion, a certain amount of carburant conduct is added to the top of the slag in ladle incessantly
Slag reduction agent, carbon content is 90% in carburant, and carburant 470kg is added altogether.
(2) ladle is transported to LF treatment stations, slag and molten steel is heated using LF graphite electrodes, together
The high-temperature area that Shi Liyong LF graphite electrodes are formed completes reducing agent with (P in vessel slag2O5)、(SiO2)、(MnO)、
(FeO) reaction, electrode voltage 435V, electric current 50000A.It is stirred using argon bottom-blowing simultaneously, bottom
The Nm of Argon throughput 203/ h, mixing time 14min, processing procedure does not add any slag material.
(3) after slag is fully reduced, argon bottom-blowing flow to 80 Nm is increased3/ h carries out desulfurization to molten steel, takes off
Oxygen and it is sufficiently stirred for, upper machine casting after corresponding alloying is carried out thereafter according to steel grades requirement.
Molten steel, slag composition before converter tapping and LF alloyings is as shown in table 2.As can be seen from the table,
Reduction treatment is carried out to slag by using reducing agent so that (the P before LF alloyings in slag2O5)、(SiO2)、
(MnO), (FeO) content decreases than converter tapping process, while can make molten steel after slag is reduced
[Si], [Mn], [P] content increased.
The molten steel of table 2 and slag composition change, %
| [C] | [Si] | [Mn] | [P] | [S] | (MnO) | (FeO) | |||
| Converter tapping | 0.04 | 0.01 | 0.05 | 0.013 | 0.020 | 1.2 | 12.3 | 2.1 | 17.8 |
| Before LF alloyings | 0.15 | 0.045 | 0.062 | 0.016 | 0.022 | 0.2 | 3.7 | 0.3 | 2.9 |
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, by hot casting
The molten iron surface that recrement is poured into after skimming, is hereafter blended into converter with molten iron.
Embodiment 2：
(1) converter tapping quantity 253t, tapping process does not control the lower quantity of slag, the molten steel in converter is all entered as far as possible
In entering ladle so that during a part of molten state vessel slag pours into ladle in converter, the quantity of slag is 2.5t in ladle,
During slag is reversed to ladle introversion, a certain amount of metallic aluminium conduct is added to the top of the slag in ladle incessantly
Slag reduction agent, adds metallic aluminium 400kg altogether.
(2) ladle is transported to LF treatment stations, slag and molten steel is heated using LF graphite electrodes, together
The high-temperature area that Shi Liyong heating processes are formed completes metallic aluminium with (P in vessel slag2O5)、(SiO2)、(MnO)、
(FeO) reaction.Electrode voltage 435V, electric current 50000A, while being stirred using bottom blowing nitrogen, bottom
The Nm of nitrogen flushing throughput 153/ h, mixing time 10min, processing procedure does not add any slag material.
(3) after slag reduction, bottom blown gas are switched into argon gas, increases argon bottom-blowing flow to 90 Nm3/ h,
Complete the desulfurization of molten steel, deoxidation and be sufficiently stirred for, after carrying out corresponding alloying thereafter according to steel grades requirement
Upper machine casting.
Molten steel, slag composition before converter tapping and LF alloyings is as shown in table 3.As can be seen from the table,
Reduction treatment is carried out to slag by using reducing agent so that (the P in vessel slag2O5)、(SiO2)、(MnO)、
(FeO) it is reduced, causes that [Si], [Mn] of molten steel, [P] content increased after reduction.
The molten steel of table 3 and slag composition change, %
| [C] | [Si] | [Mn] | [P] | [S] | (MnO) | (FeO) | |||
| Converter tapping | 0.035 | 0.01 | 0.05 | 0.015 | 0.025 | 1.1 | 14.2 | 1.8 | 19.3 |
| Before LF alloyings | 0.05 | 0.04 | 0.058 | 0.017 | 0.025 | 0.17 | 4.5 | 0.28 | 2.5 |
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, by hot casting
The molten iron surface that recrement is poured into after skimming, is hereafter blended into converter with molten iron.
Claims (3)
1. the hot circulation utilization method of a kind of vessel slag, it is characterised in that comprise the following steps：
(1) converter tapping process does not control the lower quantity of slag, the molten steel in converter is all entered in ladle as far as possible, while
A part of molten state vessel slag in converter is set to enter in ladle, it is ensured that the ratio of the quantity of slag and Metal Weight is
0.005-0.02, during slag is reversed to ladle introversion, adds slag to the top of the slag in ladle incessantly
Reducing agent；
(2) ladle is transported to LF treating stations after converter tapping terminates, the high-temperature region reality formed using LF heated by electrodes
Existing slag reduction agent and phosphorus, silicon, manganese, the chemical reaction of ferriferous oxide in slag, while using bottom blowing stirring gas
Body is stirred, and gas flow is 0.04Nm3/ ht~0.12Nm3/ ht, mixing time is 5min-20min；
(3) after slag is reduced sufficiently, Bottom Blowing Gas Flow Rate to 0.25Nm is increased3/ ht~0.40Nm3/ ht, profit
Reduction refining is carried out to molten steel with slag, molten steel desulfurizing, deoxy technology requirement is met, while according to slag reduction
Afterwards to the requirement of molten steel phosphorus, silicon, the influence of manganese composition and steel grade, Alloying Treatment, molten steel composition are carried out to molten steel
Meet upper machine after requiring with temperature to cast；
(4) after cast terminates, the ladle that will be equipped with hot casting residue is transported to molten iron drossing station, more than hot casting
The molten iron surface that slag is poured into after skimming, is hereafter blended into converter with molten iron.
2. the hot circulation utilization method of a kind of vessel slag according to claim 1, it is characterised in that：Steel
Water stirring gas is Ar, N2、CO2In one or more.
3. the hot circulation utilization method of a kind of vessel slag according to claim 1, it is characterised in that：Stove
The main component of slag reducing agent is one or more of aluminium, carbon, calcium, and the addition of slag reduction agent meets
Can be simple substance the oxide Restore All of the phosphorus in vessel slag, silicon, iron, manganese.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109609721A (en) * | 2018-12-19 | 2019-04-12 | 钢铁研究总院 | A kind of method that converter recycles the hot casting residue of ladle |
| CN109797338A (en) * | 2019-02-11 | 2019-05-24 | 黑龙江建龙钢铁有限公司 | A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique |
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN111996314A (en) * | 2020-07-31 | 2020-11-27 | 鞍钢股份有限公司 | Method for extracting iron by using carbon reduction thermal state converter slag |
| CN115491444A (en) * | 2022-08-30 | 2022-12-20 | 马鞍山钢铁股份有限公司 | Method for preventing ladle from sticking and splashing by returning ladle casting residue to converter in hot state |
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| CN109609721A (en) * | 2018-12-19 | 2019-04-12 | 钢铁研究总院 | A kind of method that converter recycles the hot casting residue of ladle |
| CN109797338A (en) * | 2019-02-11 | 2019-05-24 | 黑龙江建龙钢铁有限公司 | A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique |
| CN110669900A (en) * | 2019-10-08 | 2020-01-10 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN110669900B (en) * | 2019-10-08 | 2021-08-06 | 安徽富凯特材有限公司 | Method for reutilization of AOD pre-reduced slag |
| CN111996314A (en) * | 2020-07-31 | 2020-11-27 | 鞍钢股份有限公司 | Method for extracting iron by using carbon reduction thermal state converter slag |
| CN115491444A (en) * | 2022-08-30 | 2022-12-20 | 马鞍山钢铁股份有限公司 | Method for preventing ladle from sticking and splashing by returning ladle casting residue to converter in hot state |
| CN115491444B (en) * | 2022-08-30 | 2024-01-30 | 马鞍山钢铁股份有限公司 | Method for preventing ladle from adhering and splashing by hot return of ladle casting residue to converter |
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