CN117286298A - Method for directly alloying manganese ore to efficiently smelt Mn-containing stainless steel - Google Patents
Method for directly alloying manganese ore to efficiently smelt Mn-containing stainless steel Download PDFInfo
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- CN117286298A CN117286298A CN202311271336.7A CN202311271336A CN117286298A CN 117286298 A CN117286298 A CN 117286298A CN 202311271336 A CN202311271336 A CN 202311271336A CN 117286298 A CN117286298 A CN 117286298A
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- 239000011572 manganese Substances 0.000 title claims abstract description 96
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 65
- 239000010935 stainless steel Substances 0.000 title claims abstract description 49
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005275 alloying Methods 0.000 title claims abstract description 22
- 241001062472 Stokellia anisodon Species 0.000 title claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 69
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000001301 oxygen Substances 0.000 claims abstract description 64
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 64
- 238000007664 blowing Methods 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 28
- 238000003723 Smelting Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 229910052786 argon Inorganic materials 0.000 claims abstract description 14
- 239000012452 mother liquor Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 17
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000914 Mn alloy Inorganic materials 0.000 description 4
- 239000002436 steel type Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000011504 laterite Substances 0.000 description 1
- 229910001710 laterite Inorganic materials 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
Classifications
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- 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
- C21C5/005—Manufacture of stainless steel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for smelting Mn-containing stainless steel by directly alloying manganese ore, which comprises the steps of adding manganese ore before oxygen blowing of a converter begins, controlling the initial temperature of stainless steel mother liquor fed into the converter to be 1450-1550 ℃, and reducing a part of MnO by utilizing Si element remained in the initial stainless steel mother liquor; meanwhile, the temperature of the converter molten pool and the mixing proportion of nitrogen or argon in different converter molten pool carbon content ranges are accurately regulated and controlled, so that Mn element oxidation is reduced; then the alkalinity of the slag is adjusted to 4.0-5.0, so that MnO in the slag is free, and the activity is increased to be beneficial to reduction of Mn; and after oxygen blowing is finished, adding silicon, taking the silicon as a reducing agent, and carrying out final reinforced Mn reduction to further prepare Cr-Mn-Ni-N stainless steel molten steel. The Mn yield in manganese ore in manganese-containing stainless steel smelting can stably reach more than 90%, and the manganese alloying efficiency is higher and more economic.
Description
Technical Field
The invention relates to the field of stainless steel smelting, in particular to a method for directly alloying manganese ores to efficiently smelt Mn-containing stainless steel.
Background
The Cr-Mn-Ni-N stainless steel is a stainless steel product with relatively low cost, and the use amount in recent years is increased year by year to more than one third of the total stainless steel output in China. The method mainly comprises the steps of smelting low-nickel molten iron in a blast furnace by using laterite nickel ore in a domestic main production enterprise, smelting molten steel with components meeting the requirements of finished products in a GOR converter or an AOD converter, refining, and casting into billets. Because the Mn content in the Cr-Mn-Ni-N stainless steel is generally 8% -12%, the Mn element is used as an important alloy component which is inferior to the Cr content in the Cr-Mn-Ni-N stainless steel, and the cost of the Cr-Mn-Ni-N stainless steel is about 15%.
The prior method for improving the Mn content in the smelting process of Cr-Mn-Ni-N stainless steel mainly comprises two steps: one is to add manganese alloys (e.g., high carbon ferromanganese, ferrosilicon, etc.) directly; the other is to add manganese ore and to alloy it during the smelting process (i.e. direct alloying of manganese ore). Because the manganese alloy is refined by adopting manganese ore to consume a large amount of energy, the direct addition of the manganese alloy not only has high energy consumption and environmental pollution in the production process, but also has high price, so that the smelting cost of Cr-Mn-Ni-N stainless steel is high. Therefore, the process of directly alloying manganese ore is favored by wide iron and steel enterprises from the cost point of view. However, a major difficulty facing the direct alloying process of manganese ores is that: mn yield is generally low, and economic value is low. For example: the Chinese patent with the application number of CN201610305864.3 discloses a process for directly alloying manganese ores, wherein the process adopts a primary carbon drawing method, manganese alloy ores are added into a converter in batches within 4-10 min after the smelting of the converter, and the final carbon content is as follows: c is more than or equal to 0.08 percent. However, the yield of manganese in this patent is only 40%.
In addition, the Chinese patent with the application number of CN201510296049.0 discloses a method for improving the yield of manganese in molten steel directly alloyed with manganese ore, which is characterized in that manganese ore, lime or light burned dolomite, anthracite or coke are processed through a plurality of procedures to be used as outer powder, and aluminum powder or silicon powder is used as inner powder to be prepared into cored wires; and feeding the cored wire when the ladle enters the station in the refining process. Although the manganese yield of the technology can reach more than 90%, the manufacturing process is complex, special equipment is required to be purchased additionally, the time and the labor are consumed, the production efficiency is difficult to improve, and the popularization is not facilitated.
Therefore, it is very necessary to develop a method for directly alloying and efficiently smelting Mn-containing stainless steel from manganese ores, which has simple manufacturing process, does not need additional purchasing equipment and can ensure the yield of manganese to be more than 90 percent.
Disclosure of Invention
According to the method, thermodynamic and kinetic conditions of reduction of MnO in metallurgical slag are analyzed, and the metallurgical characteristics of a converter are combined, so that the method for directly alloying manganese ore to efficiently smelt Mn-containing stainless steel is designed, and the Mn yield in manganese ore in manganese-containing stainless steel smelting can be stabilized to be more than 90%.
A method for directly alloying manganese ore to smelt Mn-containing stainless steel efficiently comprises the following steps:
(1) Oxygen blowing smelting is carried out on stainless steel mother liquor in a converter, manganese ore is added into the converter before oxygen blowing of the converter is started, and the main components of the manganese ore are as follows: 28-45% of Mn, 3-25% of Fe and 3-25% of Al 2 O 3 :3%-10%，SiO 2 3-13%, controlling the adding amount of manganese ore to 20-50kg/t steel (molten steel amount), and controlling the initial temperature of the stainless steel mother liquor entering the furnace to 1450-1550 ℃;
(2) When the carbon content of the oxygen blown into the converter is more than 1.0 percent, controlling the temperature of the converter molten pool at 1450-1550 ℃, and mixing more than one of nitrogen and argon according to the ratio of 5:1;
(3) When oxygen blown into the converter is less than 0.35 percent and the carbon content of a converter molten pool is less than or equal to 1.0 percent, controlling the temperature of the converter molten pool at 1600-1650 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:1;
(4) When oxygen blown into the converter is less than 0.10 percent and the carbon content of a converter molten pool is less than or equal to 0.35 percent, controlling the temperature of the converter molten pool to 1650-1700 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:2;
(5) When oxygen blown into the converter is less than 0.05 percent and the carbon content of a converter molten pool is less than or equal to 0.10 percent, controlling the temperature of the converter molten pool at 1700-1750 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:3;
(6) The carbon content in the molten pool of the oxygen blowing end point converter is more than or equal to 0.05%; lime is added in the oxygen blowing smelting process, and the alkalinity of slag is controlled to be 4.0-5.0;
(7) After oxygen blowing is finished, sampling and analyzing MnO in slag 2 According to the content of MnO 2 Si is 10:3-3.5, the amount of ferrosilicon or ferrosilicon is calculated and added into a converter molten pool, and the stirring intensity of any one or more of nitrogen and argon is controlled to be 0.7-1.2Nm 3 Min.t, ensure MnO in slag 2 Fully mixing and contacting Si to promote Mn reduction, controlling the stirring time to be 5-8 minutes, and blocking slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel.
As known from metallurgical principles, mn is better than Fe to be oxidized in a converter under smelting conditions; as is evident from the analysis of the oxygen potential, mn is oxidized preferentially to C at 1420 ℃. Therefore, it is difficult to efficiently reduce Mn in manganese ores for alloying under oxidizing atmosphere conditions for smelting iron-based steel products including Cr-Mn-Ni-N-based stainless steel. From the viewpoint of favorable reduction conditions of Mn, higher bath temperature, higher slag basicity, reduced slag oxidizing property and a small slag amount are required.
The inventor firstly adjusts the adding time of manganese ore, adds a proper amount of manganese ore into a converter before oxygen blowing begins, fully utilizes Si element remained in the original stainless steel mother liquor, and reduces a part of MnO through Si; the temperature of the original stainless steel mother liquor is controlled to be 1450-1550 ℃, so that the temperature of a converter molten pool is ensured to be more than 1450 ℃ when oxygen blowing is started, oxygen elements and C are oxidized as much as possible when oxygen blowing is started, and Mn element oxidation is reduced; then, the content of C, the temperature of a converter molten pool and the mixing proportion of nitrogen or argon are precisely regulated and controlled, so that the partial pressure of CO in the molten pool is realized, the C-O reaction is promoted, and the oxidation of Mn element is reduced; the alkalinity of the slag is regulated, so that MnO in the slag is free, and the activity is increased to facilitate the reduction of Mn; and after oxygen blowing is finished, adding silicon as a reducing agent, and carrying out final reinforced Mn reduction, so that the yield of manganese reaches more than 90%, mn element in manganese ore is economically utilized, and the manganese alloying efficiency is higher and more economical. In addition, the method for directly alloying the manganese ore to efficiently smelt the Mn-containing stainless steel has the advantages of simple steps, easy operation, no need of additional equipment purchase and capability of ensuring that the manganese yield stably reaches more than 90 percent.
Preferably, the converter is a GOR furnace.
Description of the embodiments
The following describes in detail the embodiments of the method for efficiently smelting Mn-containing stainless steel by direct alloying of manganese ores according to the present invention:
example 1
Furnace number: 532216
Smelting steel type BN1D2 (Cr-Mn-Ni-N stainless steel).
The method for directly alloying and efficiently smelting BN1D2 by using the manganese ore in the embodiment 1 comprises the following steps of:
oxygen blowing smelting is carried out on stainless steel mother liquor in a converter, manganese ore is added into the converter before oxygen blowing of the converter is started, and the main components of the manganese ore are as follows: 28-45% of Mn, 3-25% of Fe and 3-25% of Al 2 O 3 :3%-10%，SiO 2 3-13% of manganese ore, wherein the adding amount of the manganese ore is 20kg/t of steel (molten steel amount), and the initial temperature of the stainless steel mother solution is controlled at 1488 ℃;
wherein, the composition of the stainless steel mother liquor is shown in the following table 1:
TABLE 1 stainless steel mother liquor furnace charging composition (%)
(2) When the carbon content of the oxygen blown into the converter is more than 1 percent, the temperature of the converter molten pool is 1450-1550 ℃ according to the following conditions5:1 mixing with nitrogen, wherein oxygen is 100m 3 Per min, nitrogen 20m 3 /min；
(3) When oxygen blown into the converter is less than 0.35 percent and the carbon content of a converter molten pool is less than or equal to 1.0 percent, the temperature of the converter molten pool is 1636 ℃, and nitrogen is mixed according to the ratio of 1:1 in the oxygen blowing process, wherein the oxygen is 60m 3 Per min, nitrogen 60m 3 /min；
(4) When oxygen is blown into the converter at the temperature of 0.10 percent less than the carbon content of a converter molten pool and less than or equal to 0.35 percent, the temperature of the converter molten pool is 1678 ℃, and nitrogen is mixed according to the ratio of 1:2 in the oxygen blowing process, wherein the oxygen is 40m 3 Per min, nitrogen 80m 3 /min；
(5) When oxygen is blown into the converter at the temperature of 0.05 percent less than the carbon content of a converter molten pool and less than or equal to 0.10 percent, the temperature of the converter molten pool is 1700 ℃, nitrogen is mixed in according to the ratio of 1:3 in the oxygen blowing process, wherein the oxygen is 30m 3 /min, nitrogen 90m 3 /min；
(6) The C content in the molten pool of the oxygen blowing end point converter is 0.050%; lime is added in the oxygen blowing smelting process, and the alkalinity of slag is controlled at 4.3;
(7) After oxygen blowing is finished, sampling and analyzing MnO in slag 2 According to the content of MnO 2 Si is 10:3-3.5, adding 8600kg of ferrosilicon or ferrosilicon, adding into a converter molten pool, and keeping the stirring strength of bottom blowing nitrogen at 0.7-1.2Nm 3 /min.t (specifically 1.0Nm 3 And (2) stirring for 5 minutes, and stopping slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel with the steel grade of BN1D 2.
The yield of manganese in manganese ore in this heat was found to be 93.9%.
Example 2
Furnace number: 532217
Smelting steel type BN1D2 (Cr-Mn-Ni-N stainless steel).
The method for directly alloying manganese ores in example 2 to efficiently smelt BN1D2 is different from example 1 in that:
(1) The addition amount of manganese ore is 32kg/t steel, and the initial temperature of stainless steel mother liquor is controlled at 1450 ℃;
(2) When the carbon content of the converter molten pool is less than or equal to 1.0 percent and the oxygen is blown into the converter at 0.35 percent, the temperature of the converter molten pool is 1610 ℃;
(3) When the carbon content of the converter molten pool is less than or equal to 0.35 percent and the oxygen is blown into the converter at 0.10 percent, the temperature of the converter molten pool is 1660 ℃;
(4) The C content in the molten pool of the oxygen blowing end point converter is 0.060 percent;
(5) The alkalinity of slag is controlled at 4.1;
(6) After oxygen blowing, 9400kg of ferrosilicon or ferrosilicon is added into the converter molten pool, and the stirring intensity of bottom blowing nitrogen is regulated to 0.7-1.2Nm 3 /min.t (specifically 1.2Nm 3 And (2) stirring for 8 minutes, and stopping slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel with the steel grade of BN1D 2.
The yield of manganese in manganese ore in this heat was found to be 96.3%.
Example 3
Furnace number: 532218
Smelting steel type BN1D2 (Cr-Mn-Ni-N stainless steel).
The method for directly alloying manganese ores in example 3 to efficiently smelt BN1D2 is different from example 1 in that:
(1) The addition amount of manganese ore is 50kg/t steel, and the initial temperature of stainless steel mother liquor is controlled at 1548 ℃;
(2) When the carbon content of the converter molten pool is less than or equal to 1.0 percent and the oxygen is blown into the converter at 0.35 percent, the temperature of the converter molten pool is 1610 ℃;
(3) When the carbon content of the converter molten pool is less than or equal to 0.35 percent and the oxygen is blown into the converter at 0.10 percent, the temperature of the converter molten pool is 1660 ℃;
(4) When oxygen blown into the converter is less than 0.05 percent and the carbon content of a converter molten pool is less than or equal to 0.10 percent, the temperature of the converter molten pool is 1718 ℃;
(5) The C content in the molten pool of the oxygen blowing end point converter is 0.072;
(6) The alkalinity of slag is controlled at 4.8;
(7) After oxygen blowing is finished, 8400kg of ferrosilicon or ferrosilicon is added into a converter molten pool, and the stirring intensity of bottom blowing nitrogen is regulated to 0.7-1.2Nm 3 /min.t (specifically 1.2Nm 3 And (2) stirring for 6 minutes, and blocking slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel with the steel grade of BN1D 2.
The yield of manganese in manganese ore in this heat was found to be 91.1%.
Comparative example 1
Furnace number: 532185
Smelting steel type BN1D2 (Cr-Mn-Ni-N stainless steel).
The method for directly alloying manganese ores of comparative example 1 to efficiently smelt BN1D2 is different from example 1 in that:
(1) Manganese ore is added into the converter in the middle and later stage of oxygen blowing of the converter, the addition amount of the manganese ore is 21kg/t of steel, and the initial temperature of the stainless steel mother liquor is controlled at 1461 ℃;
(2) When oxygen is blown into the converter and the carbon content of the converter molten pool is more than 1%, nitrogen is mixed according to the ratio of 10:1, wherein the oxygen is 100m 3 Per min, nitrogen 10m 3 /min；
(3) When oxygen blown into the converter is less than 0.35 percent and the carbon content of a converter molten pool is less than or equal to 1.0 percent, the temperature of the converter molten pool is 1610 ℃, nitrogen is mixed according to the ratio of 3:2 in the oxygen blowing process, wherein the oxygen is 80m 3 Per min, nitrogen 60m 3 /min；
(4) When oxygen blown into the converter is less than 0.10 percent and the carbon content of a converter molten pool is less than or equal to 0.35 percent, the temperature of the converter molten pool is 1650 ℃, and nitrogen is mixed according to the ratio of 5:8 in the oxygen blowing process, wherein the oxygen is 50m 3 Per min, nitrogen 80m 3 /min；
(5) When oxygen blown into the converter is less than 0.05 percent and the carbon content of a converter molten pool is less than or equal to 0.10 percent, the temperature of the converter molten pool is 1708 ℃;
(6) The C content in the molten pool of the oxygen blowing end point converter is 0.053 percent; lime is added in the oxygen blowing smelting process, and the alkalinity of slag is controlled at 3.8;
(7) After oxygen blowing is finished, sampling and analyzing MnO in slag 2 According to the content of MnO 2 Si is 10:3-3.5, ferrosilicon or ferrosilicon is added into 10300kg, and the mixture is added into a converter molten pool, and the stirring intensity of bottom blowing nitrogen is regulated to 0.7-1.2Nm 3 /min.t (specifically 1.0Nm 3 And (2) stirring for 5 minutes, and blocking slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel with the steel grade of BN1D 2.
The yield of manganese in manganese ore in this heat was found to be 82.7%.
As can be seen from the comparison of comparative example 1 and examples 1 to 3, the addition timing of manganese ore in comparative example 1, the temperature of the converter molten pool in the same carbon content range, the mixing ratio of nitrogen in the same carbon content range, and the slag basicity do not meet the requirements of the application, and the yield of manganese in the corresponding manganese ore is obviously lower than that in examples 1 to 3 of the application.
In addition, the present inventors have also tested that when the stirring intensity of bottom-blown nitrogen in step (6) of the present application is less than 0.7Nm 3 At/min.t, stirring of the converter molten pool is weakened, mnO in slag 2 Inadequate mixing with Si, reduced stirring intensity to 0.65Nm in the test heat 3 And/min.t, stirring for 6 minutes, and the Mn yield is only 81%. When the capacity of the test equipment (converter) was 100 tons, the stirring intensity of the bottom-blown nitrogen gas in step (6) of the present application exceeded 1.2Nm 3 At/min.t, splash is likely to occur, which is not recommended.
The converters of examples 1 to 3 and comparative example 1 in this application are GOR furnaces.
Of course, the nitrogen mixed in steps (2) to (5) corresponding to examples 1 to 3 and comparative example 1 of the present application may be replaced with argon, or may be replaced with a mixed gas of nitrogen and argon.
It should be understood by those skilled in the art that the present invention may be embodied in many different forms without departing from the spirit or essential characteristics thereof.
Claims (2)
1. A method for directly alloying manganese ore to smelt Mn-containing stainless steel with high efficiency is characterized by comprising the following steps:
(1) Oxygen blowing smelting is carried out on stainless steel mother liquor in a converter, manganese ore is added into the converter before oxygen blowing of the converter is started, and the main components of the manganese ore are as follows: 28-45% of Mn, 3-25% of Fe and 3-25% of Al 2 O 3 :3%-10%，SiO 2 3-13%, controlling the adding amount of manganese ore to 20-50kg/t steel (molten steel amount), and controlling the initial temperature of the stainless steel mother liquor entering the furnace to 1450-1550 ℃;
(2) When the carbon content of the oxygen blown into the converter is more than 1.0 percent, controlling the temperature of the converter molten pool at 1450-1550 ℃, and mixing more than one of nitrogen and argon according to the ratio of 5:1;
(3) When oxygen blown into the converter is less than 0.35 percent and the carbon content of a converter molten pool is less than or equal to 1.0 percent, controlling the temperature of the converter molten pool at 1600-1650 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:1;
(4) When oxygen blown into the converter is less than 0.10 percent and the carbon content of a converter molten pool is less than or equal to 0.35 percent, controlling the temperature of the converter molten pool to 1650-1700 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:2;
(5) When oxygen blown into the converter is less than 0.05 percent and the carbon content of a converter molten pool is less than or equal to 0.10 percent, controlling the temperature of the converter molten pool at 1700-1750 ℃, and mixing more than one of nitrogen and argon according to the ratio of 1:3;
(6) The carbon content in the molten pool of the oxygen blowing end point converter is more than or equal to 0.05%; lime is added in the oxygen blowing smelting process, and the alkalinity of slag is controlled to be 4.0-5.0;
(7) After oxygen blowing is finished, sampling and analyzing MnO in slag 2 According to the content of MnO 2 Si is 10:3-3.5, the amount of ferrosilicon or ferrosilicon is calculated and added into a converter molten pool, and the stirring intensity of any one or more of nitrogen and argon is controlled to be 0.7-1.2Nm 3 Min.t, ensure MnO in slag 2 Fully mixing and contacting Si to promote Mn reduction, controlling the stirring time to be 5-8 minutes, and blocking slag and tapping to obtain Cr-Mn-Ni-N stainless steel molten steel.
2. The method for efficiently smelting Mn-containing stainless steel by directly alloying manganese ore according to claim 1, which is characterized in that: the converter adopts a GOR furnace.
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