CN110551865A - system and process for treating molten iron of manganese-rich slag furnace by utilizing induction heating and blowing - Google Patents
system and process for treating molten iron of manganese-rich slag furnace by utilizing induction heating and blowing Download PDFInfo
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- CN110551865A CN110551865A CN201910877598.5A CN201910877598A CN110551865A CN 110551865 A CN110551865 A CN 110551865A CN 201910877598 A CN201910877598 A CN 201910877598A CN 110551865 A CN110551865 A CN 110551865A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 236
- 239000011572 manganese Substances 0.000 title claims abstract description 132
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 126
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 112
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000002893 slag Substances 0.000 title claims abstract description 106
- 230000006698 induction Effects 0.000 title claims abstract description 70
- 238000007664 blowing Methods 0.000 title claims abstract description 44
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 32
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 239000012141 concentrate Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 description 25
- 238000003723 Smelting Methods 0.000 description 20
- 239000000203 mixture Substances 0.000 description 18
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 12
- 229910000805 Pig iron Inorganic materials 0.000 description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000006227 byproduct Substances 0.000 description 8
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 8
- 229910000914 Mn alloy Inorganic materials 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram 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
- 238000011084 recovery Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002699 waste material Substances 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
- C21C1/00—Refining of pig-iron; Cast iron
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a system and a process for treating molten iron of a manganese-rich slag furnace by utilizing induction heating and blowing, wherein the process at least comprises the following steps of utilizing the induction furnace to increase the temperature of the high-manganese molten iron to be above 1450 ℃, blowing FeO and Fe 2 O 3 materials into the induction furnace through blowing equipment, utilizing the blown jet flow to drive the molten steel to flow and strengthen stirring, and after the blowing is finished, enabling generated SiO 2 and MnO to enter slag to form the manganese-rich slag.
Description
Technical Field
The technology belongs to the technical field of metallurgy.
Background
the manganese-rich slag furnace is a smelting device for smelting raw ore with low manganese content in China into manganese-rich slag with high manganese content by using a selective reduction process. The main product of the manganese-rich slag furnace is manganese-rich slag, and the byproduct is high-manganese pig iron. The process route of the manganese-rich slag furnace is as follows: mixing low-grade manganese ore (the manganese content is about 15-25%) with coke, and smelting in a manganese-rich slag furnace → forming manganese-rich slag (the manganese content is 35-40%) and a byproduct (high-manganese molten iron, the manganese content is 8-9%). The manganese-rich slag is used for smelting into manganese iron, manganese silicon and other alloys in an ore furnace; the by-product, namely high-manganese molten iron, is poured into high-manganese iron blocks and is used for smelting molten steel in steelmaking enterprises.
The process has the following disadvantages:
(1) the temperature of the by-product (high manganese molten iron) is 1250 ℃, and the by-product contains a large amount of physical heat (1.15GJ/t), and is taken away by cooling water in the casting process to form steam discharge, thereby causing waste of heat energy;
(2) In the process of casting iron, the iron is splashed, the loss of residual iron and the like is caused, and the environment is polluted;
(3) in the process of casting iron, the material consumption is increased, and the cost is increased;
(4) the recovery rate of manganese resources in the raw ore is low, and the recovery rate is reduced by more than 8%;
(5) increasing the lime consumption of converter smelting: 25 kg/t;
(6) Increasing the metal consumption of converter smelting: 42 kg/t;
(7) The splashing loss of converter smelting is increased: more than 0.4 percent;
(8) the slag amount of converter smelting is increased by more than 120 kg/t;
(9) the smelting time of the converter is increased: 1-2 min;
(10) Because a large amount of manganese oxide is formed in the smelting process of the high manganese molten iron, the slag is rare, the slag splashing furnace protection effect is poor, and the service life of the furnace lining is low;
(11) Because of high manganese and silicon content, the oxygen consumption of the converter is increased to 6Nm 3/t;
(12) The added value of the by-product is low, the high manganese molten iron contains a large amount of manganese elements, and the manganese elements are sold as pig iron at low price, so that the utilization value of manganese is reduced; high manganese pig iron block: 2155 yuan, becoming rod wire: about 4000 yuan/t;
(13) The smelting cost of the converter is increased: 200 yuan/t.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the system and the process for treating the molten iron of the manganese-rich slag furnace by utilizing induction heating and blowing, which are energy-saving, environment-friendly and low in cost.
in order to achieve the aim, the invention discloses a process for treating molten iron of a manganese-rich slag furnace by utilizing induction heating and blowing, which at least comprises the following steps:
The temperature of the high manganese molten iron is increased to over 1450 ℃ by using an induction furnace;
blowing a material containing FeO and Fe 2 O 3 into the induction furnace through blowing equipment;
Driving molten steel to flow by utilizing the jet flow of the jet flow to intensify stirring;
After the blowing is finished, the generated SiO 2 and MnO enter the slag to form manganese-rich slag.
Preferably, the FeO and Fe 2 O 3 materials are iron ore concentrate powder, sintered ore powder and/or iron oxide sheets.
preferably, the step of adding the high manganese molten iron into the induction furnace comprises the following steps:
31) High manganese molten iron generated by the manganese-rich slag furnace enters the molten iron tank through the molten iron runner;
32) Transporting the hot metal ladle to a heating station of the induction furnace through a hot metal ladle car;
33) And adding molten iron in the molten iron tank into the induction furnace.
in order to achieve the above object, the present invention provides a system for treating molten iron in a slag-rich manganese furnace by induction heating and blowing, comprising:
The induction furnace is used for raising the temperature of the high manganese molten iron to above 1450 ℃;
the blowing equipment is used for blowing a material containing FeO and Fe 2 O 3 into the induction furnace;
meanwhile, the jet flow blown by the blowing equipment is used for driving the molten steel to flow and strengthen stirring;
After the blowing is finished, the generated SiO 2 and MnO enter the slag to form manganese-rich slag.
in order to achieve the above object, the present invention provides a system for treating molten iron in a manganese slag-rich furnace by induction heating and injection, comprising:
The manganese-rich slag furnace is used for producing high-manganese molten iron and outputting the high-manganese molten iron to the molten iron channel;
the hot metal ladle is used for receiving high manganese molten iron flowing out of the hot metal runner;
the hot metal ladle car is used for conveying the hot metal ladle to the induction heating station;
The induction furnace is used for heating the high manganese molten iron mixed into the induction furnace by the molten iron tank to above 1450 ℃;
the blowing equipment is used for blowing a material containing FeO and Fe 2 O 3 into the induction furnace;
the tipping device is used for tipping the induction furnace;
The slag raking machine is used for raking the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace.
Further, the converter is used for carrying out steel making on the molten iron after slag skimming.
the invention described above has the following features:
(1) The physical heat of the high manganese molten iron is fully utilized, and the aims of saving energy, reducing consumption and reducing carbon emission are fulfilled;
(2) after treatment, the MnO content in the manganese-rich slag can reach more than 50 percent, the requirement of smelting ferromanganese alloy is met, and the utilization rate of manganese element in raw ore is improved by more than 8 percent;
(3) The by-product (high manganese molten iron) is efficiently utilized, and the additional value of the by-product is improved;
(4) the iron loss in the process of casting iron is reduced, and the yield of iron is improved;
(5) avoiding the environmental pollution in the process of casting iron.
Drawings
FIG. 1 is a diagram showing a system for treating molten iron in a manganese-rich slag furnace by induction heating and blowing according to the present invention.
FIG. 2 is a block diagram of a process portion of the present invention.
FIG. 1 (1) manganese-rich slag furnace; (2) a hot-metal ladle; (3) an induction furnace; (4) a blowing device; (5) a slag raking machine; (6) a ladle car; (7) a converter (8) manganese-rich slag pool; (9) a submerged arc furnace.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
the system of the present invention is shown in fig. 1.
The manganese-rich slag furnace 1 is used for producing high-manganese molten iron and outputting the high-manganese molten iron to a molten iron runner;
A hot metal ladle 2 for receiving molten iron of high manganese which flows out from the molten iron runner;
The hot metal ladle car is used for conveying the hot metal ladle to the induction heating station;
The induction furnace 3 is used for heating the high manganese molten iron mixed into the induction furnace by the molten iron tank to over 1450 ℃;
the blowing equipment 4 is used for blowing a material containing FeO and Fe 2 O 3 into the induction furnace;
the tipping device is used for tipping the induction furnace;
the slag raking machine 5 is used for raking the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace.
Further, the converter is used for carrying out steel making on the molten iron after slag skimming.
the hot metal ladle can be a non-stirring ladle or a stirring ladle with stirring, the stirring can be bottom blowing inert gas stirring or electromagnetic stirring, the induction furnace is a coreless induction furnace, the induction furnace can be powered by a series power supply or a parallel power supply, the induction furnace can also be powered by an IGBT power supply, the injection equipment adopts a spray gun which can be single-blow or composite injection, the KR stirring type can be changed, the injection material can be iron concentrate powder or sintered ore powder or iron scale and other FeO and Fe 2 O 3 containing materials, the iron concentrate powder and lime powder, or other composite powder, the dephosphorization and desulfurization reaction can be carried out if the iron concentrate powder and the lime and other composite powder are injected, a slag raking machine can be pneumatic or hydraulically driven, the hot metal ladle can be a train traction ladle or an electric ladle furnace can be an open type, or a semi-closed or fully closed tank car.
the process of the invention comprises the following steps:
(1) high manganese molten iron generated by the manganese-rich slag furnace (1) enters the molten iron tank (2) through the molten iron runner;
(2) An induction heating station of the hot metal ladle (2) is arranged through a hot metal ladle car (6);
(3) Molten iron in the molten iron tank (2) is added into the induction furnace (3);
(4) Switching on a power supply to perform induction heating, and raising the temperature of the molten iron to above 1450 ℃;
(5) blowing materials containing FeO and Fe 2 O 3 such as iron ore concentrate powder or sintered ore powder or iron scale and the like into the induction furnace (3) through a spray gun (4), oxidizing Si, Mn and C in molten iron, driving the molten steel to flow by the blown jet flow to intensively stir, and promoting the oxidation-reduction reaction to proceed;
(6) after the blowing is finished, the generated SiO2 and MnO enter the slag to form manganese-rich slag; the manganese-rich slag is raked to a manganese-rich slag pit (8) below the furnace through a tipping device and a slag raking machine (part 5);
(7) And after slagging off, conveying the manganese-rich slag in the slag pit to an ore furnace (9) for smelting ferromanganese and manganese-silicon alloy.
(8) after slagging off is finished, pouring the processed low-manganese and low-silicon molten iron into a hot metal ladle (2);
(9) The hot-metal ladle is transported to a steel plant and added into a converter (7) to be smelted into molten steel.
Example 1
the following takes a 158m 3 manganese-rich slag furnace as an example.
(1) Smelting the manganese-rich slag in a furnace to produce manganese-rich slag and high-manganese pig iron. Cooling the manganese-rich slag in a slag pit, carrying, crushing, screening, and sending to a submerged arc furnace for smelting ferromanganese and silicon-manganese alloy; the compositions of the charged mineral powder and the manganese-rich slag of the manganese-rich slag furnace are shown in table 1;
TABLE 1 composition of charged ore powder and manganese-rich slag of manganese-rich slag furnace
| name of item | MnO | FeO | SiO2 | CaO | MgO | Al2O3 | P | S |
| charging ore powder | 20.514 | 45.809 | 13.070 | 4.711 | 0.805 | 4.648 | 0.020 | 0.199 |
| Manganese-rich slag | 39.476 | 1.030 | 28.890 | 10.400 | 1.000 | 17.570 | 0.002 | 1.280 |
(2) molten iron enters a 35t molten iron tank, and is transported to an induction heating station through a molten iron tank car; the compositions and temperatures of the high manganese pig iron are shown in Table 2;
TABLE 2 high manganese molten iron composition
| Element(s) | C | Si | Mn | P | S | Temperature of |
| content/% | ～4.86 | ～0.85 | ～8.34 | ～0.15 | ～0.039 | ～1250℃ |
(3) Adding molten iron into an induction furnace;
(4) The power supply is switched on to perform induction heating, so that the temperature of the high manganese iron water is increased to 1450 ℃.
(5) lowering the furnace cover and the spray gun, blowing the sintered ore powder, carrying out desiliconization and demanganization, and simultaneously carrying out oxidation reaction on part of carbon. The molten iron composition is shown in Table 3.
TABLE 3 composition of treated molten iron
| Element(s) | C | Si | Mn | P | S | temperature of |
| content/% | 3.86～4.06 | 0.2～0.3 | 3.0～3.4 | ～0.15 | ～0.039 | 1250℃ |
(6) After the spraying and blowing are finished, the induction furnace is tilted, slag is raked into a slag pool by using a slag raking machine, and then the slag is shoveled, crushed and screened and sent to an ore furnace to smelt ferromanganese and silicon-manganese alloy; the MnO content of the manganese-rich slag is more than 50 percent.
(7) After slagging off is finished, tilting the induction furnace, and pouring molten iron into a 35t ladle;
(8) And (4) transporting the molten iron to a steelmaking workshop by using a molten iron tank car, and adding into a 40t converter to smelt into molten steel.
Example 2
(1) smelting the manganese-rich slag in a furnace to produce manganese-rich slag and high-manganese pig iron. Cooling the manganese-rich slag in a slag pit, carrying, crushing, screening, and sending to a submerged arc furnace for smelting ferromanganese and silicon-manganese alloy; the compositions of the charged mineral powder and the manganese-rich slag of the manganese-rich slag furnace are shown in table 1;
TABLE 1 composition of charged ore powder and manganese-rich slag of manganese-rich slag furnace
| name of item | MnO | FeO | SiO2 | CaO | MgO | Al2O3 | P | S |
| Charging ore powder | 20.514 | 45.809 | 13.070 | 4.711 | 0.805 | 4.648 | 0.020 | 0.199 |
| manganese-rich slag | 39.476 | 1.030 | 28.890 | 10.400 | 1.000 | 17.570 | 0.002 | 1.280 |
(2) molten iron enters a 35t molten iron tank, and is transported to an induction heating station through a molten iron tank car; the compositions and temperatures of the high manganese pig iron are shown in Table 2;
TABLE 2 high manganese molten iron composition
| element(s) | C | Si | Mn | P | S | temperature of |
| Content/% | ～4.86 | ～0.85 | ～8.34 | ～0.15 | ～0.039 | ～1250℃ |
(3) Adding molten iron into an induction furnace;
(4) the power supply is switched on to perform induction heating, so that the temperature of the high manganese iron water is increased to 1450 ℃.
(5) Lowering the furnace cover and the spray gun, blowing composite powder of sintered ore powder, lime and the like, and carrying out desiliconization, demanganization and dephosphorization, wherein part of carbon also undergoes oxidation reaction. The molten iron composition is shown in Table 3.
TABLE 3 composition of treated molten iron
| Element(s) | C | Si | Mn | P | S | Temperature of |
| Content/% | 3.86～4.06 | 0.2～0.3 | 3.0～3.4 | ～0.15 | ～0.039 | 1250℃ |
(6) after the spraying and blowing are finished, the induction furnace is tilted, slag is raked into a slag pool by using a slag raking machine, and then the slag is shoveled, crushed and screened and sent to an ore furnace to smelt ferromanganese and silicon-manganese alloy; the MnO content of the manganese-rich slag is more than 50 percent.
(7) after slagging off is finished, tilting the induction furnace, and pouring molten iron into a 35t ladle;
(8) And (4) transporting the molten iron to a steelmaking workshop by using a molten iron tank car, and adding into a 40t converter to smelt into molten steel.
Example 3
(1) smelting the manganese-rich slag in a furnace to produce manganese-rich slag and high-manganese pig iron. The manganese-rich slag enters a slag pit through a swinging launder for cooling, then is carried, crushed and screened, and is sent to an ore furnace for smelting ferromanganese and silicon-manganese alloy; the compositions of the charged mineral powder and the manganese-rich slag of the manganese-rich slag furnace are shown in table 1;
TABLE 1 composition of charged ore powder and manganese-rich slag of manganese-rich slag furnace
| Name of item | MnO | FeO | SiO2 | CaO | MgO | Al2O3 | P | S |
| Charging ore powder | 20.514 | 45.809 | 13.070 | 4.711 | 0.805 | 4.648 | 0.020 | 0.199 |
| Manganese-rich slag | 39.476 | 1.030 | 28.890 | 10.400 | 1.000 | 17.570 | 0.002 | 1.280 |
(2) The molten iron flows into the swinging launder through the molten iron runner and then enters the induction heating furnace; the compositions and temperatures of the high manganese pig iron are shown in Table 2;
TABLE 2 high manganese molten iron composition
| Element(s) | C | Si | Mn | P | S | temperature of |
| Content/% | ～4.86 | ～0.85 | ～8.34 | ～0.15 | ～0.039 | ～1250℃ |
(3) After tapping, the power supply is switched on to perform induction heating, so that the temperature of the high manganese iron water is raised to 1450 ℃.
(4) Lowering the furnace cover and the spray gun, blowing composite powder of sintered ore powder, lime and the like, and carrying out desiliconization, demanganization and dephosphorization, wherein part of carbon also undergoes oxidation reaction. The molten iron composition is shown in Table 3.
TABLE 3 composition of treated molten iron
| element(s) | C | Si | Mn | P | S | temperature of |
| content/% | 3.86～4.06 | 0.2～0.3 | 3.0～3.4 | ～0.15 | ～0.039 | 1250℃ |
(5) After the spraying and blowing are finished, the induction furnace is tilted, slag is raked into a slag pool by using a slag raking machine, and then the slag is shoveled, crushed and screened and sent to an ore furnace to smelt ferromanganese and silicon-manganese alloy; the MnO content of the manganese-rich slag is more than 50 percent.
(6) After slagging off is finished, tilting the induction furnace, and pouring molten iron into a 35t ladle;
(7) and (4) transporting the molten iron to a steelmaking workshop by using a molten iron tank car, and adding into a 40t converter to smelt into molten steel.
Claims (6)
1. A process for treating molten iron in a manganese-rich slag furnace by utilizing induction heating and blowing is characterized by at least comprising the following steps of:
the temperature of the high manganese molten iron is increased to over 1450 ℃ by using an induction furnace;
Blowing a material containing FeO and Fe 2 O 3 into the induction furnace through blowing equipment;
driving molten steel to flow by utilizing the jet flow of the jet flow to intensify stirring;
After the blowing is finished, the generated SiO 2 and MnO enter the slag to form manganese-rich slag.
2. the process of claim 1, wherein the FeO and Fe 2 O 3 materials are iron ore concentrate, sinter ore and/or iron oxide scale.
3. the process for treating molten iron in a manganese-rich slag furnace by induction heating and blowing as claimed in claim 1, wherein said step of charging the high manganese molten iron into the induction furnace comprises:
31) High manganese molten iron generated by the manganese-rich slag furnace enters the molten iron tank through the molten iron runner;
32) Transporting the hot metal ladle to a heating station of the induction furnace through a hot metal ladle car;
33) And adding molten iron in the molten iron tank into the induction furnace.
4. A system for processing molten iron in a manganese-rich slag furnace by using induction heating and blowing, the system comprising at least:
the induction furnace is used for raising the temperature of the high manganese molten iron to above 1450 ℃;
The blowing equipment is used for blowing a material containing FeO and Fe 2 O 3 into the induction furnace;
Meanwhile, the jet flow blown by the blowing equipment is used for driving the molten steel to flow and strengthen stirring;
After the blowing is finished, the generated SiO 2 and MnO enter the slag to form manganese-rich slag.
5. A system for processing molten iron in a manganese-rich slag furnace using induction heating and injection, the system comprising:
the manganese-rich slag furnace is used for producing high-manganese molten iron and outputting the high-manganese molten iron to the molten iron channel;
The hot metal ladle is used for receiving high manganese molten iron flowing out of the hot metal runner;
the hot metal ladle car is used for conveying the hot metal ladle to the induction heating station;
the induction furnace is used for heating the high manganese molten iron mixed into the induction furnace by the molten iron tank to above 1450 ℃;
the blowing equipment is used for blowing a material containing FeO and Fe 2 O 3 into the induction furnace;
The tipping device is used for tipping the induction furnace;
The slag raking machine is used for raking the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace.
6. the system for processing molten iron in a slag-enriched furnace using induction heating and blowing according to claim 5, further comprising a converter for making steel from the slag-removed molten iron.
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Application publication date: 20191210 |