CN112853042A - Method for increasing manganese in high manganese steel smelting process - Google Patents
Method for increasing manganese in high manganese steel smelting process Download PDFInfo
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- 239000011572 manganese Substances 0.000 title claims abstract description 142
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 71
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 49
- 238000003723 Smelting Methods 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 53
- 239000011812 mixed powder Substances 0.000 claims abstract description 38
- 239000002893 slag Substances 0.000 claims abstract description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 238000007789 sealing Methods 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 abstract description 6
- 238000007670 refining Methods 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910000882 Ca alloy Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 150000001485 argon Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 heptaaluminum dodecacalcium Chemical compound 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for increasing manganese and desulfurizing in a high manganese steel refining process, which comprises the steps of mixing manganese ore powder and aluminum powder to obtain mixed powder; in the process of smelting high manganese steel, the mixed powder is added into molten slag, manganese ore powder and aluminum powder are subjected to oxidation reaction by using the high temperature of the molten slag, and liquid manganese metal generated by the reaction directly settles to the liquid level of the molten steel and enters the molten steel, so that the manganese content in the molten steel is increased; the alumina is combined with the calcium oxide in the slag to generate 12CaO 7Al2O3. The invention can achieve the aims of increasing manganese, desulfurizing and purifying molten steel in the process of smelting high manganese steel.
Description
Technical Field
The invention relates to the technical field of high manganese steel smelting, in particular to a method for increasing manganese in a high manganese steel smelting process.
Background
In the smelting process of the manganese-containing steel, manganese is generally added into a smelting furnace in the form of ferromanganese alloy or metal manganese, electrolytic manganese and the like; for steel grades with low manganese content, the temperature loss caused in the manganese alloying process can be compensated by a method of chemically heating or physically heating molten steel. However, for steel grades with high manganese content (more than 10%), the method for simply heating molten steel brings two disadvantages:
firstly, if a physical temperature rise method is adopted, the temperature rise time is longer, taking LF furnace electrode temperature rise as an example, the damage of steel ladle refractory materials can be aggravated due to long-time temperature rise, and meanwhile, the nitrogen content of molten steel is seriously increased, so that the molten steel components can not meet the requirements.
Secondly, if a chemical temperature rise method is adopted, taking aluminum adding and oxygen blowing as an example, a large amount of alumina inclusions exist in the molten steel, and the cleanliness of the molten steel is not favorable.
Therefore, for the production of steel grades with higher manganese content, how to compensate the temperature loss caused by manganese alloying is a difficult problem in the smelting process.
The Chinese patent with publication number CN105838848B discloses a method for preparing high manganese steel, which comprises the following steps: heating and melting scrap steel; introducing oxygen for 5-10 minutes, keeping the furnace temperature at more than 1550 ℃, and keeping the slag amount of the furnace slag at least 2%; removing part of slag, adding electrolytic manganese, pig iron, high-carbon ferromanganese and low-carbon ferrochromium, melting, and adding 60% of aluminum, 20% of silicon and 20% of calcium alloy of the total amount of molten steel for deoxidation; scattering 1% carbon-50% silicon-49% calcium composite powder of the total amount of the molten steel into the molten steel slag, keeping for 5-10 minutes, introducing heated and dehydrated argon, and keeping for 5-10 minutes; pouring molten steel into a baked steel ladle, presetting yttrium-based rare earth at the bottom of the ladle, solidifying and cooling at the tapping temperature of 1460-1500 ℃ and the pouring temperature of 1370-1390 ℃ to obtain the high manganese steel.
The Chinese invention patent with the publication number of CN105803322B discloses 'high manganese steel and a preparation method thereof', wherein the high manganese steel comprises the following components in percentage by mass: c: 0.9-1.6%, Mn: 12-26%, Cr: 1.5-2.5%, Ti: 2.0-2.5%, W: 4.0-5.0%, P is less than or equal to 0.04%, and the balance is Fe and inevitable impurities. The preparation method of the high manganese steel comprises the following steps: uniformly mixing carbon powder, electrolytic manganese powder, high-carbon manganese iron powder and high-carbon chromium iron powder to obtain tungsten-titanium-containing high-manganese steel alloy powder according to the component requirements, and keeping the mixture for 20 to 40 minutes under the pressure of 120 to 180MPa by using a cold isostatic pressing method to prepare a high-manganese steel blank; and sintering the high manganese steel blank at 1300-1400 ℃ under the vacuum degree of 1-10 Pa, and cooling to obtain the high manganese steel.
The 2 methods in the above patent documents can increase the manganese content in the steel, but both of them have two problems: firstly, the raw materials such as electrolytic manganese are used, and the cost is higher. Secondly, when manganese is alloyed, both molten steel desulfurization and molten steel purification cannot be considered.
Disclosure of Invention
The invention provides a method for increasing manganese in a high manganese steel smelting process, which can achieve the purposes of increasing manganese, desulfurizing and purifying molten steel in the high manganese steel smelting process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for increasing manganese in the smelting process of high manganese steel is provided, manganese ore powder and aluminum powder are mixed to obtain mixed powder; in the process of smelting high manganese steel, the mixed powder is added into molten slag, manganese ore powder and aluminum powder are subjected to oxidation reaction by using the high temperature of the molten slag, and liquid manganese metal generated by the reaction directly settles to the liquid level of the molten steel and enters the molten steel, so that the manganese content in the molten steel is increased; the alumina is combined with the calcium oxide in the slag to generate 12CaO 7Al2O3。
A method for increasing manganese and desulfurizing in a high manganese steel smelting process specifically comprises the following steps:
(1) calculating the dosage of the mixed powder according to the liquid steel quantity of the high manganese steel and the requirement of manganese components; according to MnO, FeO and SiO in manganese ore powder2Calculating the required manganeseThe mass of the mineral powder and the aluminum powder is calculated as follows:
a) calculating the quality Q of manganese in molten steelMn：
QMn＝Q×WMn
In the formula: q is total mass of molten steel, WMnIs the percentage content of manganese in the molten steel;
b) calculating the mass Q of manganese ore powder required by increasing manganeseManganese ore：
QManganese ore＝QMn÷(WMnO÷A)
In the formula: wMnOThe mass percentage of MnO in the manganese ore is; a is the atomic weight percentage content of Mn in MnO molecules;
c) calculating the quality Q of the aluminum powderAluminum powder：
QAluminum powder＝k×(0.25×WMnO+0.25×WFeO+0.9×WSiO2)×QManganese ore
In the formula, the coefficient k is the loss of the reaction of aluminum powder and air, and k is 1.1-1.3; wFeOThe mass percentage of FeO in the mineral powder; wSiO2Is SiO in mineral powder2The mass percentage of (A);
d) calculating the mass Q of the mixed powder:
Q＝Qmanganese ore+QAluminum powder
(2) Mixing manganese ore powder with aluminum powder according to the calculation result of the step (1) to obtain mixed powder;
(3) in the process of smelting high manganese steel, the mixed powder is added to the molten slag, and argon is blown in the process of adding and stirring;
(4) detecting the manganese content in the molten steel after slagging off, and if the manganese content is insufficient, adjusting by using a ferromanganese alloy to ensure that the manganese content meets the requirement of high manganese steel components;
(5) and adjusting other chemical components and temperature of the molten steel until the smelting process is finished.
The mixed powder is packaged in bags by sealing bags; in the process of smelting high manganese steel, the bagged mixed powder is added to the molten slag through a feeding system.
In the step (3), the flow of bottom-blown argon is 0.20-0.35 m3Per ton of steel.
Compared with the prior art, the invention has the beneficial effects that:
1) the molten steel is directly alloyed by manganese ore, so that the manufacturing procedures of ferroalloy are reduced;
2) the functions of slag desulfurization and inclusion adsorption in the molten steel are added while the manganese is added to the molten steel;
3) the comprehensive efficiency of manganese increasing, desulfurizing and purifying the molten steel is high, and the high manganese molten steel with low sulfur and high purity can be obtained.
Detailed Description
The invention relates to a method for increasing manganese and desulfurizing in a high manganese steel smelting process, which comprises the steps of mixing manganese ore powder and aluminum powder to obtain mixed powder; in the process of smelting high manganese steel, the mixed powder is added into molten slag, manganese ore powder and aluminum powder are subjected to oxidation reaction by using the high temperature of the molten slag, and liquid manganese metal generated by the reaction directly settles to the liquid level of the molten steel and enters the molten steel, so that the manganese content in the molten steel is increased; the alumina is combined with the calcium oxide in the slag to generate 12CaO 7Al2O3。
A method for increasing manganese and desulfurizing in a high manganese steel smelting process specifically comprises the following steps:
(1) calculating the dosage of the mixed powder according to the liquid steel quantity of the high manganese steel and the requirement of manganese components; according to MnO, FeO and SiO in manganese ore powder2The mass content of the manganese ore powder and the aluminum powder is calculated, and the calculation process is as follows:
a) calculating the quality Q of manganese in molten steelMn：
QMn＝Q×WMn
In the formula: q is total mass of molten steel, WMnIs the percentage content of manganese in the molten steel;
b) calculating the mass Q of manganese ore powder required by increasing manganeseManganese ore：
QManganese ore＝QMn÷(WMnO÷A)
In the formula: wMnOThe mass percentage of MnO in the manganese ore is; a is the atomic weight percentage content of Mn in MnO molecules;
c) calculating the quality Q of the aluminum powderAluminum powder：
QAluminum powder＝k×(0.25×WMnO+0.25×WFeO+0.9×WSiO2)×QManganese ore
In the formula, the coefficient k is the loss of the reaction of aluminum powder and air, and k is 1.1-1.3; wFeOThe mass percentage of FeO in the mineral powder; wSiO2Is SiO in mineral powder2The mass percentage of (A);
d) calculating the mass Q of the mixed powder:
manganese ore Q + aluminum powder Q ═ Q
(2) Mixing manganese ore powder with aluminum powder according to the calculation result of the step (1) to obtain mixed powder;
(3) in the process of smelting high manganese steel, the mixed powder is added to the molten slag, and argon is blown in the process of adding and stirring;
(4) detecting the manganese content in the molten steel after slagging off, and if the manganese content is insufficient, adjusting by using a ferromanganese alloy to ensure that the manganese content meets the requirement of high manganese steel components;
(5) and adjusting other chemical components and temperature of the molten steel until the smelting process is finished.
The mixed powder is packaged in bags by sealing bags; in the process of smelting high manganese steel, the bagged mixed powder is added to the molten slag through a feeding system.
In the step (3), the flow of bottom-blown argon is 0.20-0.35 m3Per ton of steel.
The working principle of the method for increasing manganese and desulfurizing in the high manganese steel smelting process is as follows: mixing manganese ore powder and aluminum powder according to a certain proportion to obtain mixed powder, and adding the mixed powder to molten slag in the process of smelting high manganese steel; manganese oxide in manganese ore powder is used as an oxidizing agent, and aluminum powder is used as a reducing agent. Oxidizing the slag and the slag at high temperature to release a large amount of heat (the heat quantity delta H is-259.58 KJ/molAl); the temperature of the slag is greatly increased, and reaction products including liquid metal manganese, aluminum oxide, a small amount of silicon oxide and the like are obtained. Wherein the liquid manganese metal directly settles to the liquid level of the molten steel and enters the molten steel, so that the manganese content in the molten steel is increased; the alumina and the calcium oxide in the slag are combined into heptaaluminum dodecacalcium (12CaO 7 Al)2O3) Equal low melting pointThe components with high sulfur capacity absorb Al in the molten steel while deeply desulfurizing the molten steel2O3And the like; finally, the purposes of increasing manganese, desulfurizing and purifying molten steel are achieved.
The reaction formula of the oxidation reaction is:
Al+3/2MnO＝3/2Mn+1/2Al2O3
the following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the embodiment, the manganese increasing and the desulfurization are realized in the process of smelting ZGMn13-4 steel in an electric arc furnace.
The amount of molten steel was 100 tons.
In the standard chemical composition of ZGMn13-4 steel, the contents of carbon, manganese and sulfur are respectively as follows: [C] 0.90% -1.3%; 11.0 to 14.0 percent of Mn and less than or equal to 0.04 percent of S.
The manganese ore powder comprises the following main chemical components in percentage by mass: [ MnO ] of]:75.38％，[SiO2]:3.11％，[FeO]16.77 percent. The manganese content is 75.38% x 55/(55+16) 58.39%.
The specific process is as follows:
1. calculating the dosage of the mixed powder according to the liquid amount of the steel and the requirement of the manganese component of the high manganese steel;
and (3) calculating: the quality Q of manganese element required by 100 tons of ZGMn13-4 molten steelMn12.5 tons (12.5% is an intermediate value of 11.0% to 14.0%); reducing 12.5 tons of manganese from manganese ore fines requires the mass of manganese ore fines: qManganese ore30.56 tons for 12.5/75.38%/54.26%;
quality Q of required aluminum powderAluminum powder＝k×(0.25×WMnO+0.25×WFeO+0.9×WSiO2)×QManganese ore1.20 × (0.25 × 75.38% × 30.56+0.25 × 3.11% × 30.56+0.9 × 16.77% × 30.56) 12.7 tons;
the required dosage of the mixed powder is Q ═ QManganese ore+QAluminum powder＝30.56+12.43.26 tons;
mixing manganese ore powder with aluminum powder to obtain mixed powder, and packaging the mixed powder in sealed bags (50 kg/bag);
2. in the process of smelting high manganese steel in an electric arc furnace, the bagged mixed powder is added to the molten slag through a feeding system. The addition rate was adjusted to 1.5 tons/min depending on the intensity of the reaction. In the process, large-flow argon bottom blowing stirring is carried out;
3. removing excessive slag;
4. 9.5 percent of Mn and 0.004 percent of S in the molten steel are detected, and the part with insufficient manganese components is adjusted by medium-carbon ferromanganese alloy, so that the content meets the requirement;
5. continuously adjusting other components and temperature until the requirements of smelting procedures are met;
6. sampling and detecting, and the purity index T [ O ] in steel is 0.0010%. The high manganese steel liquid with low sulfur and high purity is obtained.
[ example 2 ]
In the embodiment, the manganese increasing and the desulfurization are realized in the process of smelting ZGMn13-1 steel in an electric arc furnace.
The amount of molten steel was 70 tons.
In the standard chemical components of ZGMn13-1 steel, the contents of carbon, manganese and sulfur are respectively as follows: [C] 1.0 percent to 1.45 percent; 11.0 to 14.0 percent of Mn and less than or equal to 0.04 percent of S.
The manganese ore powder comprises the following main chemical components in percentage by mass: [ MnO ] of]:70.05％，[SiO2]:3.41％，[FeO]15.56 percent, and the manganese content is 70.05 percent and multiplied by 55/(55+16) and 54.26 percent.
The specific process is as follows:
1. calculating the dosage of the mixed powder according to the liquid amount of the steel and the requirement of the manganese component of the high manganese steel;
and (3) calculating: the quality Q of manganese element required by 70 tons of ZGMn13-1 molten steelMn70 × 12.5% ═ 8.75 tons (12.5% intermediate between 11.0% and 14.0%); reduction of 8.75 tons of manganese from manganese ore fines requires the mass Q of the manganese ore finesManganese ore8.75/70.05%/54.26%/23.02 ton;
quality Q of required aluminum powderAluminum powder＝k×(0.25×WMnO+0.25×WFeO+0.9×WSiO2)×QManganese ore1.20 × (0.25 × 70.05% × 23.02+0.25 × 3.41% × 23.02+0.9 × 15.56% × 23.02) ═ 8.94 tons;
the required dosage of the mixed powder is Q ═ QManganese ore+QAluminum powder23.02+ 8.94-31.96 tonnes.
The manganese ore powder and the aluminum powder are mixed to obtain mixed powder, and the mixed powder is packaged in sealed bags (100 kg/bag).
2. In the process of smelting high manganese steel in an electric arc furnace, the bagged mixed powder is added to the molten slag through a feeding system, and the adding speed is adjusted to be 1.0 ton/min according to the reaction strength. In the process, large-flow argon bottom blowing stirring is carried out;
3. removing excessive slag;
4. 9.8 percent of Mn and 0.0045 percent of S in the molten steel are detected, and the part with insufficient manganese is adjusted by medium carbon ferromanganese alloy, so that the content meets the requirement;
5. continuously adjusting other components and temperature until the requirements of smelting procedures are met;
6. sampling and detecting, the purity index T [ O ] in steel is 0.0014%. The high manganese steel liquid with low sulfur and high purity is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A method for increasing manganese in the smelting process of high manganese steel is characterized in that manganese ore powder and aluminum powder are mixed to obtain mixed powder; in the process of smelting high manganese steel, the mixed powder is added into molten slag, manganese ore powder and aluminum powder are subjected to oxidation reaction by using the high temperature of the molten slag, and liquid manganese metal generated by the reaction directly settles to the liquid level of the molten steel and enters the molten steel, so that the manganese content in the molten steel is increased; the alumina is combined with the calcium oxide in the slag to generate 12CaO 7Al2O3。
2. The method for increasing manganese and desulfurizing in the high manganese steel smelting process according to claim 1, which is characterized by comprising the following steps:
(1) calculating the dosage of the mixed powder according to the liquid steel quantity of the high manganese steel and the requirement of manganese components; according to MnO, FeO and SiO in manganese ore powder2The mass content of the manganese ore powder and the aluminum powder is calculated, and the calculation process is as follows:
a) calculating the quality Q of manganese in molten steelMn：
QMn＝Q×WMn
In the formula: q is total mass of molten steel, WMnIs the percentage content of manganese in the molten steel;
b) calculating the mass Q of manganese ore powder required by increasing manganeseManganese ore：
QManganese ore＝QMn÷(WMnO÷A)
In the formula: wMnOThe mass percentage of MnO in the manganese ore is; a is the atomic weight percentage content of Mn in MnO molecules;
c) calculating the quality Q of the aluminum powderAluminum powder：
QAluminum powder＝k×(0.25×WMnO+0.25×WFeO+0.9×WSiO2)×QManganese ore
In the formula, the coefficient k is the loss of the reaction of aluminum powder and air, and k is 1.1-1.3; wFeOThe mass percentage of FeO in the mineral powder; wSiO2Is SiO in mineral powder2The mass percentage of (A);
d) calculating the mass Q of the mixed powder:
Q＝Qmanganese ore+QAluminum powder
(2) Mixing manganese ore powder with aluminum powder according to the calculation result of the step (1) to obtain mixed powder;
(3) in the process of smelting high manganese steel, the mixed powder is added to the molten slag, and argon is blown in the process of adding and stirring;
(4) detecting the manganese content in the molten steel after slagging off, and if the manganese content is insufficient, adjusting by using a ferromanganese alloy to ensure that the manganese content meets the requirement of high manganese steel components;
(5) and adjusting other chemical components and temperature of the molten steel until the smelting process is finished.
3. The method for increasing manganese and desulfurizing during the smelting process of high manganese steel according to claim 2, characterized in that the mixed powder is packaged in bags by sealing bags; in the process of smelting high manganese steel, the bagged mixed powder is added to the molten slag through a feeding system.
4. The method for increasing manganese and desulfurizing in the high manganese steel smelting process according to claim 2, characterized in that in the step (3), the bottom blowing argon flow is 0.20-0.35 m3Per ton of steel.
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