CN211339576U - Equipment for treating molten iron of manganese-rich slag furnace by utilizing electrode heating and blowing - Google Patents
Equipment for treating molten iron of manganese-rich slag furnace by utilizing electrode heating and blowing Download PDFInfo
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- CN211339576U CN211339576U CN201921543773.9U CN201921543773U CN211339576U CN 211339576 U CN211339576 U CN 211339576U CN 201921543773 U CN201921543773 U CN 201921543773U CN 211339576 U CN211339576 U CN 211339576U
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Abstract
The utility model discloses a device for treating molten iron of a manganese-rich slag furnace by utilizing electrode heating and blowing. At least comprises the following steps: the electrode heating equipment is used for heating the high manganese molten iron to above 1450 ℃; a blowing device for blowing FeO and Fe into the induction furnace2O3A material; meanwhile, the jet flow blown by the blowing equipment is used for driving the molten steel to flow and strengthen stirring; and the slag skimming equipment is used for skimming the formed manganese-rich slag into the slag pit after the injection is finished. The equipment of the utility model fully utilizes the physical heat of the high manganese molten iron, and achieves the purposes of saving energy, reducing consumption and reducing carbon emission; reduceThe iron loss in the process of casting iron improves the yield of iron; avoiding the environmental pollution in the process of casting iron.
Description
Technical Field
The utility model relates to a device for treating molten iron of a manganese-rich slag furnace by utilizing electrode heating and blowing.
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%) and coke, and smelting in a manganese-rich slag furnace to form manganese-rich slag (the manganese content is 35-40%) and high-manganese molten iron (the manganese content is 8-9%). The manganese-rich slag is used for smelting manganese iron, manganese silicon and other alloys in an ore-smelting furnace; the high manganese molten iron belongs to a byproduct, 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) contains a large amount of physical heat (1.15GJ/t) at 1250 ℃, and the by-product is not recycled in the casting process and is taken away by cooling water to form steam emission, 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: more than 25 kg/t;
(6) increasing the metal consumption of converter smelting: 42kg/t or more;
(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: 6Nm3/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.
SUMMERY OF THE UTILITY MODEL
In order to avoid the defects, the utility model aims to provide a device for treating the molten iron of the manganese-rich slag furnace by utilizing electrode heating and blowing, which improves the added value of byproducts, saves energy, reduces consumption and carbon emission.
In order to achieve the above object, the present invention provides an apparatus for treating molten iron of a manganese-rich slag furnace by heating and blowing using electrodes, the apparatus comprising at least:
the electrode heating equipment is used for heating the high manganese molten iron to above 1450 ℃;
a blowing device for blowing FeO and Fe into the induction furnace2O3A material;
meanwhile, the jet flow blown by the blowing equipment is used for driving the molten steel to flow and strengthen stirring;
and the slag skimming equipment is used for skimming the formed manganese-rich slag into the slag pit after the injection is finished.
In order to achieve the above object, the present invention provides an apparatus for treating molten iron of a manganese-rich slag furnace by heating and blowing using electrodes, the apparatus 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 electrode heating equipment is used for heating the high manganese molten iron to above 1450 ℃;
a blowing device for blowing FeO and Fe into the induction furnace2O3A material;
the tipping device is used for tipping the induction furnace;
and the slag skimming equipment is used for skimming the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace. Further comprises a converter for carrying out steel making on the molten iron after slag skimming
The above-mentioned apparatus has the following salient points:
(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 schematic structural diagram of the apparatus of the present invention.
Fig. 2 is a flow chart of the operation of the apparatus shown in fig. 1.
The apparatus of fig. 1 consists of: (1) a manganese-rich slag furnace; (2) a hot-metal ladle; (3) a ladle car; (4) an electrode heating device; (5) a blowing device; (6) a slag raking machine; (7) a converter; (8) a slag pit (slag bath) below the furnace; (9) a submerged arc furnace.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
The utility model discloses in utilize electrode heating and jetting to handle the equipment of rich manganese slag stove molten iron, include: 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 3 is used for conveying the hot metal ladle to an induction heating station; the electrode heating equipment 4 is used for raising the temperature of the high manganese iron water to over 1450 ℃; a blowing device 5 for blowing FeO and Fe into the induction furnace2O3A material; the tipping device is used for tipping the induction furnace; and the slag raking machine 6 is used for raking the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace. A converter 7 for making steel from the slag-removed molten iron
Wherein, the hot-metal bottle can be not stirred, but also can be stirredMay be stirred. The stirring mode can be bottom-blowing inert gas stirring or electromagnetic stirring. The hot metal ladle car can be pulled by a train and can also be electrically driven. The electrode heating apparatus 4 is an electrode heating furnace, which includes: the furnace cover can be made of a refractory material or a water-cooled tube; the electrode heating device can be a direct current power supply or an alternating current power supply. The number of the electrodes can be single electrodes or three electrodes, and also can be double electrodes plus a magnetic mirror coil. The blowing equipment is a spray gun which can be singly blown or compositely blown; the KR stirring type can be replaced by the KR stirring type. The blowing material can be iron concentrate powder or sintered ore powder or iron scale containing FeO and Fe2O3The material can also be iron ore concentrate powder and lime powder, and can also be other composite powder. If the composite powder of iron concentrate powder and lime is injected, dephosphorization and desulfurization reactions can be carried out. The crawler loader may be pneumatically or hydraulically driven.
The working flow of the system is as follows:
the production process of the patented technology is schematically shown in fig. 2 below.
(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) the hot metal ladle 2 is transported to a heating station through a hot metal ladle car 3;
(3) the furnace cover and the electrode are lowered to raise the temperature of the molten iron to over 1450 ℃.
(4) Blowing iron ore concentrate powder or sintered ore powder or iron scale containing FeO and Fe into the hot metal ladle 2 through a spray gun2O3The material is to oxidize Si, Mn and C in molten iron, and to utilize the jetted jet flow to drive the molten iron to flow and strengthen stirring, so as to promote the oxidation-reduction reaction.
The reaction equation is as follows:
[Si]+2(FeO)＝2[Fe]+(SiO2)+Qput..........................(1)
[Si]+2/3(Fe2O3)＝4/3[Fe]+(SiO2)+QPut.........................(2)
[Mn]+(FeO)＝[Fe]+(MnO)+QPut........................(3)
[Mn]+1/3(Fe2O3)＝2/3[Fe]+(MnO)+QPut........................(4)
[C]+(FeO)＝[Fe]+{CO}+QSuction device......................(5)
[C]+1/3(Fe2O3)＝2/3[Fe]+{CO}+QSuction device.....................(6)
(5) After the blowing is finished, SiO generated2MnO enters the slag to form manganese-rich slag; the manganese-rich slag is raked to a slag pit under the furnace through a tipping device and a slag raking machine (part 6);
(6) 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.
(7) And after slagging off is finished, the processed low-manganese and low-silicon molten iron is directly sent to a steel plant and added into a converter 7 to be smelted into molten steel.
Example 1
Below at 450m3The manganese-rich slag furnace is taken as an example for further explanation.
(1) Smelting the manganese-rich slag furnace (part 1) to produce manganese-rich slag and high-manganese pig iron. The manganese-rich slag enters a slag pit for cooling, then is carried, crushed and screened, and is sent to an ore furnace (part 9) 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 65t molten iron tank (part 2) and is conveyed to a heating station through a molten iron tank car (part 3); 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 entering a heating station, lowering a furnace cover and an electrode, and heating the molten iron to ensure that the temperature of the high manganese molten iron is increased to 1450 ℃; then lifting the electrode;
(4) the spray gun is lowered, iron ore concentrate powder is blown to the hot metal ladle (part 2) for desiliconization and demanganization, and meanwhile, partial 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 blowing is finished, SiO generated2MnO enters the slag to form manganese-rich slag; the manganese-rich slag is raked to a furnace slag pit (part 8) through a tipping device and a slag raking machine (part 6);
(6) after slagging off, conveying the manganese-rich slag in the slag pit to an ore furnace (part 9) for smelting ferromanganese and manganese-silicon alloy; the MnO content of the manganese-rich slag is more than 50%;
(7) after slagging off, the residual low-manganese and low-silicon molten iron is directly sent to a steel plant and added into an 80t converter (piece 7) to be smelted into molten steel.
Example 2
(1) Smelting the manganese-rich slag furnace (part 1) to produce manganese-rich slag and high-manganese pig iron. The manganese-rich slag enters a slag pit for cooling, then is carried, crushed and screened, and is sent to an ore furnace (part 9) 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 65t molten iron tank (part 2) and is conveyed to a heating station through a molten iron tank car (part 3); 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 entering a heating station, lowering a furnace cover and an electrode, and heating the molten iron to ensure that the temperature of the high manganese molten iron is increased to 1450 ℃; then lifting the electrode;
(4) and (3) descending the spray gun, blowing composite powder of iron concentrate powder, lime powder and the like to the hot metal ladle (part 2) for desiliconization, demanganization and dephosphorization, 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℃ |
(5) After the blowing is finished, SiO generated2And MnO is introduced intoAdding the manganese-rich slag into the slag to form manganese-rich slag; the manganese-rich slag is raked to a furnace slag pit (part 8) through a tipping device and a slag raking machine (part 6);
(6) after slagging off, conveying the manganese-rich slag in the slag pit to an ore furnace (part 9) for smelting ferromanganese and manganese-silicon alloy; the MnO content of the manganese-rich slag is more than 50%;
(7) after slagging off, the residual low-manganese and low-silicon molten iron is directly sent to a steel plant and added into an 80t converter (piece 7) to be smelted into molten steel.
Claims (3)
1. An apparatus for processing molten iron in a manganese-rich slag furnace by electrode heating and blowing, the apparatus comprising at least:
the electrode heating equipment is used for heating the high manganese molten iron to above 1450 ℃;
a blowing device for blowing FeO and Fe into the induction furnace2O3A material;
meanwhile, the jet flow blown by the blowing equipment is used for driving the molten steel to flow and strengthen stirring;
and the slag skimming equipment is used for skimming the formed manganese-rich slag into the slag pit after the injection is finished.
2. An apparatus for processing molten iron of a manganese-rich slag furnace using electrode heating and blowing, the apparatus 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 electrode heating equipment is used for heating the high manganese molten iron to above 1450 ℃;
a blowing device for blowing FeO and Fe into the induction furnace2O3A material;
the tipping device is used for tipping the induction furnace;
and the slag skimming equipment is used for skimming the manganese-rich slag from the tilting induction furnace to a manganese-rich slag pit below the furnace.
3. The apparatus for processing molten iron in a slag-enriched furnace using electrode heating and blowing according to claim 2, further comprising a converter for making steel from the slag-removed molten iron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921543773.9U CN211339576U (en) | 2019-09-17 | 2019-09-17 | Equipment for treating molten iron of manganese-rich slag furnace by utilizing electrode heating and blowing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921543773.9U CN211339576U (en) | 2019-09-17 | 2019-09-17 | Equipment for treating molten iron of manganese-rich slag furnace by utilizing electrode heating and blowing |
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| CN211339576U true CN211339576U (en) | 2020-08-25 |
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| CN201921543773.9U Expired - Fee Related CN211339576U (en) | 2019-09-17 | 2019-09-17 | Equipment for treating molten iron of manganese-rich slag furnace by utilizing electrode heating and blowing |
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Granted publication date: 20200825 |