CN114686736A - Method for converting medium-low carbon ferromanganese by high carbon ferromanganese - Google Patents
Method for converting medium-low carbon ferromanganese by high carbon ferromanganese Download PDFInfo
- Publication number
- CN114686736A CN114686736A CN202210358658.4A CN202210358658A CN114686736A CN 114686736 A CN114686736 A CN 114686736A CN 202210358658 A CN202210358658 A CN 202210358658A CN 114686736 A CN114686736 A CN 114686736A
- Authority
- CN
- China
- Prior art keywords
- carbon ferromanganese
- decarburization
- equal
- less
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 76
- 229910000616 Ferromanganese Inorganic materials 0.000 title claims abstract description 67
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 title claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005261 decarburization Methods 0.000 claims abstract description 49
- 238000007664 blowing Methods 0.000 claims abstract description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 56
- 239000011572 manganese Substances 0.000 claims description 26
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 239000002893 slag Substances 0.000 claims description 24
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 9
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 8
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 6
- 229910000514 dolomite Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000004512 die casting Methods 0.000 claims description 4
- 239000010436 fluorite Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 2
- 239000000571 coke Substances 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 229910000720 Silicomanganese Inorganic materials 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 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 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C22/00—Alloys based on manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for converting medium and low carbon ferromanganese by blowing high carbon ferromanganese, which comprises the steps of raw material preparation, oxygen blowing decarburization, stirring reduction and the like, wherein a specific decarburization container is used for converting, and the phenomena of volatilization, splashing, furnace lining corrosion and the like are avoided in the refining process by specifically setting the steps and parameters.
Description
Technical Field
The invention belongs to the field of alloy smelting, and particularly relates to a method for converting medium-and-low-carbon ferromanganese by blowing high-carbon ferromanganese.
Background
The medium-carbon and low-carbon ferromanganese is an important raw material for steel making, and is mainly produced by an electro-silicothermic process at present, the used raw materials are manganese ore, manganese-silicon alloy and lime, the used heat source mainly comes from electric energy, the production cost is higher, and the development potential is smaller although the process is stable and mature.
At present, a lot of researches are carried out on the process of converting high-carbon ferromanganese into medium-and low-carbon ferromanganese in many countries, wherein the process is carried out by a converter methodThe alloy production process is particularly attractive due to the advantages of low cost and the like. U.S. patent publication No. US5047081A discloses a method for decarburising molten Cr metal, and European patent publication No. EP446860B1 discloses a method for melting raw metals and alloys in a converter equipped with top and bottom blowing. However, the converter oxygen blowing method for producing medium and low carbon ferromanganese generally has the following problems: 1. volatilization phenomenon, because the melting point (1246 ℃) and the boiling point (2120 ℃) of manganese are both very low, the temperature reaches more than 1600 ℃ in the oxygen blowing decarburization process, so that the manganese is seriously volatilized, and the recovery rate of the manganese is seriously influenced by the volatilization phenomenon; 2. the phenomenon of splashing, because in the process of gradually proceeding oxygen blowing decarburization, with the rise of the temperature of a molten pool, CO gas can be generated, and the generated gas can promote the generation of the phenomenon that solution is sprayed out from a furnace mouth, thereby causing serious loss of melt, equipment and the like and further influencing the operation and the recovery rate of manganese; 3. the corrosion phenomenon of the furnace lining is caused because silicon in the carbon manganese molten iron is firstly oxidized to form SiO in the oxygen blowing decarburization process2The melt can erode the furnace wall, causing short service life of the furnace body and further influencing the production cost.
Disclosure of Invention
The invention provides a method for directly producing medium and low carbon ferromanganese by blast furnace high carbon ferromanganese fine casting, which has the advantages of simple operation, high manganese recovery rate, reduction of furnace lining corrosion and energy saving, and overcomes the volatilization, splashing and corrosion phenomena caused by the process for producing medium and low carbon ferromanganese by the converter.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for converting medium-low carbon ferromanganese by high carbon ferromanganese comprises the following steps:
(1) preparing raw materials, namely 75-82 parts by weight of high-carbon ferromanganese iron molten iron, 7-12 parts by weight of a slag former, 0-5 parts by weight of a coolant and 5-12 parts by weight of a silicon-manganese alloy.
(2) Blowing oxygen for decarburization, pouring the molten high-carbon ferromanganese molten iron into a decarburization container according to the weight part in the step (1), pouring the molten high-carbon ferromanganese molten iron into the decarburization container at the temperature of 1320-1500 ℃, and simultaneously blowing oxygen into the decarburization container from a top blowing oxygen lance at the top part of the decarburization container and a gas injection pipe at the bottom part of the decarburization container respectively for decarburization reaction,the oxygen supply intensity is 1-2 Nm3Min. t; when the temperature of a molten pool in the decarburization container reaches 1530-1700 ℃ in the blowing process, adding a slag former and a coolant into the furnace according to the weight proportion of the step (1) to ensure that the binary alkalinity of the slag is 1.2-1.5; when the mass percent of carbon in the melt is less than 1.8 wt%, the decarburization is finished and the oxygen supply is stopped.
(3) Stirring and reducing: adding the silicon-manganese alloy into the decarburization container according to the weight part ratio of the step (1), and simultaneously blowing inert gas from a gas nozzle at the bottom of the decarburization container for stirring, wherein the blowing strength is 0.1-0.3Nm3And (c) min.t, discharging to obtain liquid medium and low carbon ferromanganese.
(4) Granulating or casting: and (4) granulating or die-casting the liquid medium-low carbon ferromanganese taken as the raw material discharged from the step (3) to obtain a medium-low carbon ferromanganese finished product (namely granulating or die-casting by adopting the conventional molten iron granulation method and a casting die-casting method).
The molten high-carbon ferromanganese iron comprises the following components in percentage by weight: mn: 60.0-82.0 wt%, Si: 1.0-2.0 wt%, C: 2.0-8.0 wt%, P: less than or equal to 0.30 wt%, S: less than or equal to 0.03wt percent, and the balance of iron and inevitable impurities.
The decarburization container comprises a furnace body and a furnace cover, one or more feed inlets are arranged at the top of the decarburization container and used for adding solid or liquid raw materials into the decarburization container, a top-blowing oxygen lance penetrates through the center of the top of the decarburization container and is vertically arranged, the diameter of the throat of the top-blowing oxygen lance is 10-20mm, an air nozzle (most preferably arranged on the side wall) is arranged on the side wall or the bottom wall of the bottom of the decarburization container, the diameter of the air nozzle is 5-8mm, and a gas regulating valve is arranged inside the air nozzle. The gas regulating valve is used for regulating the flow rate of gas and the type of the injected gas.
The decarburization container is formed by reforming AOD equipment and comprises a furnace body, a supporting ring, a tilting mechanism, a gas mixing and modulating part and a gas blowing part, and a temperature measuring and sampling part, wherein the furnace body comprises a furnace body and a furnace cover, feeding is discharged from the bottom, after blowing is finished, the furnace body is tilted through the tilting mechanism and is discharged from the top of the tilted furnace body, oxygen can be blown at the top of the furnace body by adjusting the diameter of a throat of a top-blowing oxygen lance and the diameter of an air jet pipe in an equal structure, and oxygen and inert gas are blown at the side part of the bottom.
Preferably, the medium-low carbon ferromanganese is obtained by the following components in percentage by weight: mn: 60.0-85.0 wt%, Si: less than or equal to 2.5 wt%, C: 1.0-2.9 wt%, P: less than or equal to 0.40 wt%, S: less than or equal to 0.03wt percent, and the balance of iron and inevitable impurities.
Preferably, the preparation method of the high-carbon ferromanganese iron liquid in the raw materials comprises the following steps: adding 45-55 parts by weight of manganese sintered ore, 25-35 parts by weight of manganese lump ore, 12-15 parts by weight of coke and 10-12 parts by weight of flux into a blast furnace, setting the blast furnace air temperature at 800-1100 ℃, and the blast furnace tapping period at 120-150 min, wherein the discharged molten iron is the molten high-carbon ferromanganese iron.
Preferably, the flux is lime or a mixture of lime and fluorite; CaO in the lime is more than or equal to 90 wt%, and the granularity is 10-50 mm; CaF in fluorite2Not less than 85 wt%, and the granularity is 10-40 mm.
Preferably, in the step (1), the coolant is carbon ferromanganese and/or medium carbon ferromanganese, and the carbon ferromanganese comprises the following components: 65.0 to 72.0 wt% of Mn, less than or equal to 7.0 wt% of C, less than or equal to 4.5 wt% of Si, less than or equal to 0.4 wt% of P, less than or equal to 0.03 wt% of S, and the balance of Fe and inevitable impurities; the medium carbon ferromanganese comprises the following components: 75.0-82.0 wt% of Mn, less than or equal to 2.0 wt% of C, less than or equal to 2.5 wt% of Si, less than or equal to 0.4 wt% of P, less than or equal to 0.03 wt% of S, and the balance Fe and inevitable impurities.
Preferably, the silicon-manganese alloy in the step (1) comprises the following components: 60.0-67.0 wt% of Mn, 1.2 wt% of C, Si: 20.0-25.0 wt%, P is less than or equal to 0.25 wt%, S is less than or equal to 0.04 wt%, and the balance is Fe and impurities.
Preferably, the slag former in the step (2) comprises one or any combination of more of dolomite, lime and alumina, wherein CaO in the dolomite is more than or equal to 30 wt%, and SiO is2Not more than 3.0 wt%, CaO in lime not less than 80 wt%, and Al in alumina2O3≥97wt％。
Preferably, in the step (2), the time for blowing oxygen to perform the decarburization reaction during the blowing process is 60 to 90min per 25 tons of molten high carbon ferromanganese iron being blown.
Preferably, the inert gas in step (3) is one or more of nitrogen, argon and carbon dioxide.
Compared with the prior art, the invention has the following beneficial effects:
the invention changes the traditional electro-silicothermic method and converter method, adopts a novel decarbonization container to blow oxygen for decarbonization of liquid blast furnace high-carbon ferromanganese molten iron, and can efficiently meet the blowing requirement of the invention by limiting the parameters of the oxygen lance throat, the bottom lance (gas injection pipe) diameter and the like; by regulating and controlling the oxygen blowing amount, the temperature of a molten pool and the alkalinity of slag, ferromanganese meeting the requirements of medium and low carbon is obtained under the condition of avoiding the phenomena of volatilization, splashing and the like, the recovery rate of manganese reaches more than 92 percent, and the stability of industrial production is improved on the basis of not increasing the cost. The regulation and control of the oxygen blowing amount, namely the setting of the oxygen supply intensity, has over high oxygen supply intensity, serious splashing of the melt, serious manganese loss and reduced oxygen utilization rate; the oxygen supply intensity is too low, the temperature of a molten pool is low, and the decarburization reaction in the furnace is not thorough; in the temperature of the molten pool, the temperature is too high, and the volatilization loss of manganese is serious; the temperature is too low, so that the phenomenon of furnace freezing is easy to occur in converter smelting; for slag basicity, the slag basicity is too low: slag is relatively thin, and the lining erosion is serious; too high slag basicity: the slag is thick and the fluidity is poor, so that the recovery rate of manganese is low.
The invention has the technical effects of simple operation of the whole process, wide range of raw material requirement and short production period by specifically setting each step and parameters in each step; the invention protects the furnace lining, makes the slag become alkaline slag, ensures the fluidity of the slag and prevents the splashing loss. Oxygen is injected and inert gas is reasonably injected in a specific time, so that oxygen is used for generating electricity, energy is saved, and the method is suitable for large-scale continuous production of medium and low carbon ferromanganese.
Drawings
FIG. 1 is a schematic view showing the structure and charge of a decarburization vessel of the invention.
In the figure, a is carbon ferromanganese; b is lime; c is dolomite; d is a reducing agent manganese-silicon alloy; e is oxygen; f is an inert gas (nitrogen, argon or carbon dioxide); g is coolant (manganese ore and medium-carbon ferromanganese); k is the oxygen lance throat.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of aiding understanding of the present invention and should not be construed as specifically limiting the present invention.
The invention is explained in more detail below with reference to the figures and examples.
Example 1
25t of liquid blast furnace high-carbon ferromanganese molten iron comprises the following components in percentage by weight: 74.5 wt% of Mn, 0.2 wt% of Si, 0.19 wt% of P, 6.7 wt% of C and 0.004 wt% of S, charged into the decarburization vessel shown in FIG. 1, and oxygen was blown into the top and bottom of the decarburization furnace at an oxygen flow rate of 2Nm3Min. t, the decarburization vessel shown in FIG. 1 is a schematic charging view, bottom blowing is not performed from the center of the bottom, but performed from the side wall of the bottom, that is, a bottom gas injection pipe is arranged on the side wall of the bottom of the decarburization vessel, and the decarburization temperature during blowing is controlled at 1530 ℃; the converting time is 70 minutes, in order to protect the furnace lining, the furnace slag becomes alkaline slag and the fluidity of the furnace slag is ensured, the splashing loss is prevented, and in the process of oxygen blowing, a slagging agent is added into the furnace: 2500kg of lime; in order to control the temperature of the molten pool and prevent the volatilization of manganese, a coolant is added into the furnace: 500kg of medium carbon ferromanganese, and after the decarburization is finished, the bottom gun is switched to inert gas N2Stirring is carried out, and 3000kg of silicon-manganese alloy is added at the same time, and manganese oxide in the slag is reduced. And discharging the mixture from the furnace after the reaction is finished, wherein the discharging temperature is 1500 ℃, and 25.0t of medium carbon ferromanganese is obtained and comprises the following components: 75.5 wt% of Mn, 0.5 wt% of Si, 0.2 wt% of P, 1.8 wt% of C, 0.006 wt% of S, and 1.24% of slag basicity R.
Example 2
25t of liquid carbon ferromanganese, which comprises the following components in percentage by weight: 74.6 wt% of Mn, 0.5 wt% of Si, 0.19 wt% of P, 6.7 wt% of C, 0.004 wt% of S, and the likeOxygen was blown into the decarburization vessel shown in FIG. 1 at an oxygen flow rate of 1Nm3Min. t, blowing time 90min, simultaneously adding 1000kg of manganese ore and 2250kg of lime, and after decarburization, switching the bottom lance to inert gases Ar and CO2Stirring, adding 3250kg of silicon-manganese alloy, reducing manganese oxide in the slag, discharging after the reaction is finished, wherein the discharging temperature is 1570 ℃, and obtaining 24.9t of low-carbon ferromanganese, which comprises the following components: 75.5 wt% of Mn, 0.5 wt% of Si, 0.2 wt% of P, 0.60 wt% of C, 0.006 wt% of S, and 1.2% of slag basicity R.
Claims (10)
1. A method for converting medium and low carbon ferromanganese by high carbon ferromanganese is characterized by comprising the following steps:
(1) preparing raw materials, namely 75-82 parts by weight of high-carbon ferromanganese iron molten iron, 7-12 parts by weight of a slag former, 0-5 parts by weight of a coolant and 5-12 parts by weight of a silicon-manganese alloy;
(2) blowing oxygen for decarburization, pouring the molten high-carbon ferromanganese molten iron into a decarburization container according to the weight part in the step (1), pouring the molten high-carbon ferromanganese molten iron into the decarburization container at the temperature of 1320-1500 ℃, and simultaneously blowing oxygen into the decarburization container from a top blowing oxygen lance at the top part and a gas injection pipe at the bottom part of the decarburization container respectively for decarburization reaction, wherein the oxygen supply intensity is 1-2 Nm3Min. t; when the temperature of a molten pool in the decarburization container reaches 1530-1700 ℃ in the blowing process, adding a slag former and a coolant into the furnace according to the weight proportion of the step (1) to ensure that the binary alkalinity of the slag is 1.2-1.5; when the mass percent of carbon in the melt is less than 1.8 wt%, stopping supplying oxygen after decarburization is finished;
(3) stirring and reducing: adding the silicon-manganese alloy into the decarburization container according to the weight part ratio of the step (1), and simultaneously blowing inert gas from a gas nozzle at the bottom of the decarburization container for stirring, wherein the blowing strength is 0.1-0.3Nm3T, discharging after the melting is finished to obtain liquid medium and low carbon ferromanganese;
(4) granulating or casting: granulating or die-casting liquid medium-low carbon ferromanganese after discharging in the step (3) as a raw material to obtain a medium-low carbon ferromanganese finished product;
the molten high-carbon ferromanganese iron comprises the following components in percentage by weight: mn: 60.0-82.0 wt%, Si: 1.0-2.0 wt%, C: 2.0-8.0 wt%, P: less than or equal to 0.30 wt%, S: less than or equal to 0.03wt percent, and the balance of iron and inevitable impurities.
2. The method of claim 1, wherein the decarburization vessel comprises a furnace body and a furnace cover, one or more feed ports are formed in the top of the decarburization vessel, the feed ports are used for feeding solid or liquid raw materials into the decarburization vessel, a top-blowing lance is vertically provided through the center of the top of the decarburization vessel, the throat of the top-blowing lance has a diameter of 10-20mm, an air nozzle is provided on the side wall or bottom wall of the bottom of the decarburization vessel, the diameter of the air nozzle is 5-8mm, and a gas regulating valve is provided inside the air nozzle.
3. The method for converting medium and low carbon ferromanganese by blowing high carbon ferromanganese according to claim 1 or 2, wherein the medium and low carbon ferromanganese is obtained by the following components in percentage by weight: mn: 60.0-85.0 wt%, Si: less than or equal to 2.5 wt%, C: 1.0-2.9 wt%, P: less than or equal to 0.40 wt%, S: less than or equal to 0.03wt percent, and the balance of iron and inevitable impurities.
4. The method for converting medium and low carbon ferromanganese from high carbon ferromanganese according to claim 1 or 2, wherein the method for preparing the high carbon ferromanganese in the raw material comprises: adding 45-55 parts by weight of manganese sintered ore, 25-35 parts by weight of manganese lump ore, 12-15 parts by weight of coke and 10-12 parts by weight of flux into a blast furnace, setting the blast furnace air temperature at 800-1100 ℃, and the blast furnace tapping period at 120-150 min, wherein the discharged molten iron is the high-carbon ferromanganese molten iron.
5. The method of claim 4, wherein the flux is lime or a mixture of lime and fluorite; CaO in the lime is more than or equal to 90 wt%, and the granularity is 10-50 mm; CaF in fluorite2Not less than 85 wt%, and the granularity is 10-40 mm.
6. The method of claim 1 or 2, wherein the coolant in step (1) is carbon ferromanganese and/or medium carbon ferromanganese, and the carbon ferromanganese has the following composition: 65.0 to 72.0 wt% of Mn, less than or equal to 7.0 wt% of C, less than or equal to 4.5 wt% of Si, less than or equal to 0.4 wt% of P, less than or equal to 0.03 wt% of S, and the balance of Fe and inevitable impurities; the medium carbon ferromanganese comprises the following components: 75.0-82.0 wt% of Mn, less than or equal to 2.0 wt% of C, less than or equal to 2.5 wt% of Si, less than or equal to 0.4 wt% of P, less than or equal to 0.03 wt% of S, and the balance of Fe and inevitable impurities.
7. The process of converting medium and low carbon ferromanganese from high carbon ferromanganese according to claim 1 or 2, wherein the composition of the silicomanganese alloy in step (1) is: 60.0-67.0 wt% of Mn, 1.2 wt% of C, Si: 20.0-25.0 wt%, P is less than or equal to 0.25 wt%, S is less than or equal to 0.04 wt%, and the balance is Fe and impurities.
8. The method for converting medium and low carbon ferromanganese from high carbon ferromanganese according to claim 1 or 2, wherein the slag former in step (2) comprises one or more of dolomite, lime and alumina in any combination, wherein CaO in the dolomite is more than or equal to 30 wt%, SiO in the dolomite is more than or equal to 30 wt%, and2not more than 3.0 wt%, CaO in lime not less than 80 wt%, and Al in alumina2O3≥97wt％。
9. The method of claim 1 or 2, wherein the decarburization reaction is performed by blowing oxygen during the blowing process for about 60 to 90 minutes per 25 tons of molten iron containing high carbon ferromanganese.
10. The method of claim 1 or 2, wherein the inert gas in step (3) is one or more of nitrogen, argon or carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358658.4A CN114686736A (en) | 2022-04-07 | 2022-04-07 | Method for converting medium-low carbon ferromanganese by high carbon ferromanganese |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358658.4A CN114686736A (en) | 2022-04-07 | 2022-04-07 | Method for converting medium-low carbon ferromanganese by high carbon ferromanganese |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114686736A true CN114686736A (en) | 2022-07-01 |
Family
ID=82142157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210358658.4A Pending CN114686736A (en) | 2022-04-07 | 2022-04-07 | Method for converting medium-low carbon ferromanganese by high carbon ferromanganese |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114686736A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662937A (en) * | 1984-05-28 | 1987-05-05 | Nippon Steel Corporation | Process for production of high-manganese iron alloy by smelting reduction |
| CN1219599A (en) * | 1997-12-11 | 1999-06-16 | 辽阳亚矿铁合金有限公司 | Production method for medium- and low-carbon manganese iron |
| CN112921222A (en) * | 2021-02-04 | 2021-06-08 | 山西东方资源发展有限公司 | Method for smelting low-phosphorus low-carbon silicon-manganese alloy |
-
2022
- 2022-04-07 CN CN202210358658.4A patent/CN114686736A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662937A (en) * | 1984-05-28 | 1987-05-05 | Nippon Steel Corporation | Process for production of high-manganese iron alloy by smelting reduction |
| CN1219599A (en) * | 1997-12-11 | 1999-06-16 | 辽阳亚矿铁合金有限公司 | Production method for medium- and low-carbon manganese iron |
| CN112921222A (en) * | 2021-02-04 | 2021-06-08 | 山西东方资源发展有限公司 | Method for smelting low-phosphorus low-carbon silicon-manganese alloy |
Non-Patent Citations (3)
| Title |
|---|
| G.福尔克特等（俞辉等译）: "《铁合金冶炼学》", 31 October 1978, 上海科学技术出版社 * |
| 萧泽强: "《熔池侧吹氧技术的开发 应用和研究》", 31 May 2004, 冶金工业教育资源开发中心 * |
| 许传才等: "《铁合金冶炼工艺学》", 31 August 2016, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102071287B (en) | Method for melting high-temperature-resistance and high-pressure-resistance alloy steel | |
| CN110387448B (en) | Method for producing low-phosphorus special steel quickly and low in consumption by converter | |
| CN102828098A (en) | Method for increasing molten steel finishing point manganese content by adding manganese ore outside furnace | |
| CN102069157A (en) | Method for preparing high-aluminum steel | |
| CN102766726A (en) | Method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt | |
| CN108893576A (en) | The smelting process of welding rod steel H08A | |
| CN111647708B (en) | Long-life synchronous combined blowing dephosphorization smelting method for high-phosphorus molten iron | |
| CN108913836A (en) | The production method of welding rod steel H08A | |
| CN110628985A (en) | Method for smelting special steel by bottom-blowing electric arc furnace returning oxygen blowing method | |
| CN113493868A (en) | High scrap ratio converter smelting method based on molten reduced molten iron | |
| US4410360A (en) | Process for producing high chromium steel | |
| CN111945062B (en) | Smelting method of low-carbon steel for mechanical structure pipe | |
| CN112251561B (en) | Method for smelting low-titanium steel in electric furnace under high molten iron ratio condition | |
| CN114574641B (en) | Method for smelting medium-low carbon ferromanganese | |
| CN109280741B (en) | Austenitic stainless steel refining method | |
| CN115418429A (en) | Method for smelting 200-series stainless steel in AOD furnace | |
| CN113699301B (en) | Converter smelting method for improving energy production by adopting high-flow oxygen | |
| CN114686736A (en) | Method for converting medium-low carbon ferromanganese by high carbon ferromanganese | |
| CN111663015B (en) | Method for producing pure iron by smelting reduction process | |
| CN110205434B (en) | Method for smelting steel bar with low cost | |
| CN111304523A (en) | Production process of low-aluminum ferrosilicon | |
| CN113913582A (en) | Smelting production method of large-section grinding ball steel round billet | |
| CN110551868A (en) | Method for reducing decarburization time of semisteel steelmaking converter | |
| CN114686634B (en) | 4N-grade high-purity iron and fire method industrial production method thereof | |
| CN115354209B (en) | Method for smelting high-manganese high-nitrogen steel 18Cr18Mn12Ni2N by adopting argon-oxygen furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220701 |