CN115976323A - Method for making iron by using zinc-containing and lead-containing iron ore powder - Google Patents
Method for making iron by using zinc-containing and lead-containing iron ore powder Download PDFInfo
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- CN115976323A CN115976323A CN202211075800.0A CN202211075800A CN115976323A CN 115976323 A CN115976323 A CN 115976323A CN 202211075800 A CN202211075800 A CN 202211075800A CN 115976323 A CN115976323 A CN 115976323A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 264
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 129
- 239000000843 powder Substances 0.000 title claims abstract description 67
- 239000011701 zinc Substances 0.000 title claims abstract description 54
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 51
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000001301 oxygen Substances 0.000 claims abstract description 73
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 73
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 48
- 239000003034 coal gas Substances 0.000 claims abstract description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000003723 Smelting Methods 0.000 claims abstract description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 24
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 16
- 229910052745 lead Inorganic materials 0.000 claims abstract description 12
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 239000008188 pellet Substances 0.000 claims description 14
- 239000003245 coal Substances 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UVTGXFAWNQTDBG-UHFFFAOYSA-N [Fe].[Pb] Chemical compound [Fe].[Pb] UVTGXFAWNQTDBG-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention relates to the technical field of iron making, in particular to a method for making iron by using zinc-containing and lead-containing iron ore powder. The iron making method provided by the invention comprises the following steps: carrying out fluidized bed treatment on the zinc-containing and lead-iron ore powder to obtain direct reduced iron powder and dust-containing tail gas; carrying out hot pressing on the direct reduced iron powder to obtain a hot pressed iron block; hot-pressing iron blocks are hot-fed into a total-oxygen blast furnace for total-oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag; carrying out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas; the clean coal gas is reused for fluidized bed treatment and total oxygen blast furnace smelting. According to the invention, the zinc and lead-containing iron ore powder is subjected to fluidized bed treatment before smelting in the total-oxygen blast furnace, so that the separation of zinc and lead can be realized, and the problem that the total-oxygen blast furnace cannot realize large-scale treatment of Zn and Pb-containing iron ore powder is solved. And the iron-making method realizes high integration degree of iron-making and coal-to-gas coupling, high utilization rate of energy resources and low carbon emission.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to a method for making iron by using zinc-containing and lead-containing iron ore powder.
Background
At present, the blast furnace ironmaking production is developed unprecedentedly, the scale of the blast furnace is continuously enlarged, the production consumption of the blast furnace is reduced, and the cost is reduced, so that the blast furnace ironmaking production is still the main force of steel production. The existing blast furnace ironmaking technology mainly comprises blast furnace injection hydrogen-rich gas, oxygen blast furnace, furnace top gas circulation and the like. However, the circulating enrichment of elements such as Zn and Pb in the furnace directly affects the service life of the furnace lining and the smooth production, and the blast furnace ironmaking technology cannot accept high Zn and Pb iron ore powder. That is, the conventional blast furnace iron making cannot treat the iron ore powder containing Zn and Pb.
Disclosure of Invention
The invention aims to provide a method for making iron by using zinc-containing and lead-containing iron ore powder, which can solve the problem of treatment of Zn-containing and Pb-containing iron ore powder in blast furnace iron making.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for making iron by using zinc-containing and lead-containing iron ore powder, which comprises the following steps:
carrying out fluidized bed treatment on the zinc-containing and lead-iron ore powder to obtain direct reduced iron powder and dust-containing tail gas;
carrying out hot pressing on the direct reduced iron powder to obtain hot pressed iron blocks;
the hot-pressed iron blocks are thermally sent to a total-oxygen blast furnace for total-oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag;
carrying out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas;
and recycling the refined gas for the fluidized bed treatment and the total-oxygen blast furnace smelting.
Preferably, after obtaining the dust-containing tail gas, the method further includes:
carrying out gas-solid separation on the dust-containing tail gas to obtain first coal gas and Zn-and Pb-containing dust;
carrying out first carbon dioxide separation on the first coal gas to obtain carbon dioxide and first refined coal gas;
and recycling the first clean coal gas for fluidized bed treatment and total oxygen blast furnace smelting.
Preferably, the zinc-containing and lead-iron ore powder comprises the following components in percentage by mass: 30 to 50 percent of Fe, 2 to 10 percent of Zn, 1 to 5 percent of Pb and SiO 2 2-6 percent of CaO, 1-5 percent of CaO and the balance of water;
the grain size of the zinc-containing iron ore powder and the lead-containing iron ore powder is 0.1-2.0 mm.
Preferably, during the fluidized bed treatment, fine coal gas is introduced; the temperature of the refined gas is 800-900 ℃, and the flow of the refined gas required by each ton of zinc-containing and lead-iron ore powder is 2000-3000 Nm 3 (ii) a The time of the fluidized bed treatment is 15-20 min.
Preferably, the gas-solid separation mode is condensation treatment.
Preferably, the process of hot-feeding the hot-pressed iron blocks to the total-oxygen blast furnace comprises the following steps: under the condition of 300-400 ℃, a high-temperature resistant distributor is adopted to add the hot-pressed iron blocks into the oxygen blast furnace layer by layer, and sinter ore, pellet ore or lump ore is added to adjust the alkalinity of materials in the total oxygen blast furnace and meet the smelting requirement of the total oxygen blast furnace.
Preferably, 200-400 kg of coke is added to each ton of molten iron.
Preferably, the method also comprises introducing oxygen and coal powder into the total oxygen blast furnace while adding the sintered ore, the pellet ore or the lump ore.
Preferably, the purity of the oxygen gas>95 percent, the temperature of the oxygen is 900 to 1200 ℃, and the oxygen injection amount per ton of molten iron is 800 to 1400Nm 3 。
Preferably, the coal injection amount of the pulverized coal required by each ton of molten iron is 150-350 kg.
The invention provides a method for making iron by using zinc-containing and lead-containing iron ore powder, which comprises the following steps: carrying out fluidized bed treatment on the zinc-containing and lead-iron ore powder to obtain direct reduced iron powder and dust-containing tail gas; carrying out hot pressing on the direct reduced iron powder to obtain a hot pressed iron block; the hot-pressed iron blocks are thermally sent to a total-oxygen blast furnace for total-oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag; carrying out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas; and recycling the refined gas for the fluidized bed treatment and the total-oxygen blast furnace smelting. According to the invention, before the smelting of the total-oxygen blast furnace, the separation of zinc and lead is realized by carrying out fluidized bed treatment on the zinc-containing and lead-containing iron ore powder, so that the problem that the treatment of the Zn-containing and Pb-containing iron ore powder cannot be realized by the total-oxygen blast furnace is solved, and the iron-making method has the advantages of high integration degree of iron-making and coal-gas coupling, high energy resource utilization rate and low carbon emission.
Drawings
FIG. 1 is a flow chart of the iron-making method by using the zinc-containing and lead-containing iron ore powder.
Detailed Description
As shown in fig. 1, the present invention provides a method for making iron by using zinc-containing and lead-containing iron ore powder, comprising the following steps:
carrying out fluidized bed treatment on zinc-containing and lead-containing iron ore powder to obtain direct reduced iron powder and dust-containing tail gas;
carrying out hot pressing on the direct reduced iron powder to obtain a hot pressed iron block;
the hot-pressed iron blocks are thermally sent to a total-oxygen blast furnace for total-oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag;
carrying out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas;
and recycling the refined gas for the fluidized bed treatment and the total-oxygen blast furnace smelting.
In the present invention, all the raw materials are commercially available products well known to those skilled in the art unless otherwise specified.
The invention carries out fluidized bed treatment on the zinc-containing and lead-iron ore powder to obtain the direct reduced iron powder and the dust-containing tail gas.
In the invention, the zinc-containing and lead-iron ore powder preferably comprises the following components in percentage by mass: 30 to 50 percent of Fe, 2 to 10 percent of Zn, 1 to 5 percent of Pb and SiO 2 2-6 percent of CaO, 1-5 percent of CaO and the balance of water. In the present invention, the zinc-and lead-containing iron ore powder also preferably includes inevitable impurities and carbon powder. In the invention, the grain size of the zinc-containing and lead-containing iron ore powder is preferably 0.1-2.0 mm.
In the present invention, the zinc-and lead-containing iron ore powder is preferably obtained by mixing zinc-and lead-containing iron and steel plant dust with iron ore powder; the source of the dust and iron ore powder of the zinc and lead-containing iron and steel plant is not limited in any way, and the sources known to those skilled in the art can be adopted. The mixing process is not particularly limited, and may be performed by a method known to those skilled in the art.
When the particle size of the zinc-containing and lead-iron ore powder does not meet the requirement of the particle size, the zinc-containing and lead-iron ore powder is preferably ground; the process of the grinding treatment is not limited in any way, and the process known to a person skilled in the art is adopted to ensure that the particle size of the ground zinc-containing and lead-iron ore powder meets the requirements.
In the invention, during the fluidized bed treatment, fine coal gas is preferably introduced; the temperature of the refined gas is preferably 800-900 ℃, more preferably 820-880 ℃, and most preferably 840-860 ℃. The flow rate of the fine gas required by each ton of zinc-containing and lead-containing iron ore powder is preferably 2000-3000 Nm 3 More preferably 2200 to 2800Nm 3 Most preferably 2400 to 2600Nm 3 . The time of the fluidized bed treatment is preferably 15 to 20min.
In the present invention, the fluidized bed treatment is preferably carried out in a fluidized bed reactor.
In the present invention, under the above-mentioned fluidized bed treatment conditions, the zinc-containing and iron-lead ore powder can be converted into direct reduced iron powder (DRI) having a metallization ratio of 0.7 to 0.9 and a temperature of >500 ℃.
In the present invention, after obtaining the dust-containing tail gas, the method further preferably includes:
carrying out gas-solid separation on the dust-containing tail gas to obtain first coal gas and Zn-and Pb-containing dust;
carrying out first carbon dioxide separation on the first coal gas to obtain carbon dioxide and first refined coal gas;
and recycling the first clean coal gas for the fluidized bed treatment and the total oxygen blast furnace smelting.
In the present invention, the gas-solid separation method is preferably a condensation treatment. The temperature of the condensation treatment is preferably 200 to 300 ℃. In the invention, the purpose of the condensation treatment is to condense the zinc and lead steam in the dust-containing tail gas, so as to realize the recovery of zinc and lead and obtain the mixture of zinc powder and lead powder. In the invention, the mass percentage of the zinc powder in the mixture of the zinc powder and the lead powder is preferably more than 80%, or the mass percentage of the lead powder in the mixture of the zinc powder and the lead powder is preferably more than 70%.
In the present invention, the condensation treatment is preferably performed in a condenser.
In the present invention, the Zn and Pb-containing dust can be used as a high-quality raw material for extracting Zn and Pb.
After the direct reduced iron powder is obtained, the direct reduced iron powder is hot-pressed to obtain a hot-pressed iron block (HBI).
The hot pressing process is not particularly limited, and may be performed by a process known to those skilled in the art.
After the hot pressing iron ore is obtained, the hot pressing iron block is thermally sent to a total oxygen blast furnace for total oxygen blast furnace smelting, and coal gas and molten iron/blast furnace slag are obtained.
In the present invention, the process of hot-feeding the hot-pressed iron blocks to the total oxygen blast furnace is preferably: and under the condition of 300-400 ℃, adding the hot-pressed iron blocks into the oxygen blast furnace layer by adopting a high-temperature resistant distributor, and simultaneously adding sintered ore, pellet ore or lump ore to adjust the alkalinity of the materials in the total-oxygen blast furnace and meet the smelting requirement of the total-oxygen blast furnace. In the present invention, the basicity is preferably 1.2 to 1.5. In the present invention, the temperature at which the sintered ore, pellet ore or lump ore is added is preferably normal temperature; the normal temperature is understood to mean that no additional heating or cooling treatment is required.
In the present invention, 200 to 400kg of coke, more preferably 250 to 350kg of coke is added to each ton of molten iron in the total oxygen blast furnace smelting. In the present invention, the coke is preferably added in layers with the sintered ore, pellet ore or lump ore. In the present invention, the molten iron is understood to be molten iron obtained after the total oxygen blast furnace smelting.
In the invention, the process of hot-feeding the hot-pressed iron blocks to the total-oxygen blast furnace specifically comprises the following steps: and conveying the hot-pressed iron blocks to the top of the total-oxygen blast furnace through high-temperature-resistant equipment, adding the hot-pressed iron blocks into the oxygen blast furnace by adopting a high-temperature-resistant distributor according to a conventional blast furnace material distribution method at the temperature of 300-400 ℃, and adding sintered ore, pellets or lump ore according to smelting requirements of the total-oxygen blast furnace and alkalinity requirements of furnace slag during charging. Coke is preferably added in layers with the sinter, pellets or lump ore.
In the present invention, the process of hot-feeding the hot-pressed iron blocks to the total oxygen blast furnace is preferably: adding sintered ore, pellet ore or lump ore, and introducing oxygen and coal powder into the total-oxygen blast furnace.
In the present invention, the purity of the oxygen gas is preferably>95 percent; the temperature of the oxygen is preferably 900-1200 ℃, and more preferably 1000-1100 ℃; the oxygen injection amount per ton of molten iron is preferably 800-1400 Nm 3 More preferably 900 to 1200Nm 3 . In the present invention, the molten iron is understood to be molten iron obtained after the total oxygen blast furnace smelting.
In the present invention, the amount of pulverized coal injection required per ton of molten iron is preferably 150 to 350kg, and more preferably 200 to 300kg. In the present invention, the molten iron is understood to be molten iron obtained after the total oxygen blast furnace smelting.
In the present invention, the oxygen and the pulverized coal are preferably blown through an oxygen blast tuyere.
In the invention, while adding the sintered ore, the pellet ore or the lump ore, the fine coal gas is introduced into the total oxygen blast furnace. In the present invention, the temperature of the refined gas is preferably 800 to 900 ℃, more preferably 820 to 880 ℃, and most preferably 840 to 860 ℃.
After obtaining the molten iron/blast furnace slag, the invention also preferably separates the molten iron/blast furnace slag in the molten iron runner by using the density difference of the molten iron/blast furnace slag.
After the coal gas is obtained, the invention carries out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas. The process for separating carbon dioxide according to the present invention is not particularly limited, and may be performed by a process known to those skilled in the art.
In the present invention, the volume fraction of carbon monoxide in the refined gas is preferably >70%.
In the invention, the refined gas is preferably sprayed into the total-oxygen blast furnace through an upper air outlet which is annularly distributed and uniformly spaced at the height of 5-10 m above an air outlet of the total-oxygen blast furnace.
In the present invention, the flow rate of the refined gas required per ton of molten iron is preferably 500 to 700Nm 3 More preferably 550 to 650Nm 3 Most preferably 580 to 620Nm 3 . In the present invention, the molten iron is understood to be molten iron obtained after the total oxygen blast furnace smelting.
In the invention, preferably, a part of the obtained clean coal gas is used for fluidized bed treatment and total oxygen blast furnace smelting, a part of the obtained clean coal gas is combusted to provide heat for preheating of the clean coal gas used for the fluidized bed treatment and the total oxygen blast furnace smelting, and the rest of the obtained clean coal gas is used for external supply.
The method for making iron by using zinc-containing and lead-containing iron ore powder provided by the invention is described in detail with reference to the following examples, but the method is not to be construed as limiting the scope of the invention.
Example 1
As shown in figure 1, the Zn-and Pb-containing iron and steel plant dust is mixed with conventional iron ore powder and then ground to obtain the zinc-and Pb-containing iron and steel ore powder (with a particle size of 0.1-2.0 mm, wherein the zinc-and Pb-containing iron and steel ore powder comprises TFe (total iron) content of 35wt%, zn content of 6wt%, pb content of 5wt%, and SiO 2 3wt% of CaO, 1wt% of CaO, and the balance of water, carbon powder, and impurities);
adding the zinc-containing and lead-iron ore powder into a fluidized bed reactor, and simultaneously introducing clean gas preheated to 860 ℃ (the usage amount of the clean gas required by each ton of the zinc-containing and lead-iron ore powder is 2300 Nm) 3 The refined gas is obtained by subsequent carbon dioxide separation treatment) for 15-20 min, so that the mineral powder is converted into direct reduced iron powder (DRI) with the metallization rate of 0.7 and the temperature of 520 ℃ and dust-containing tail gas;
enabling the dust-containing tail gas to pass through a condenser, controlling the temperature at 200-300 ℃, condensing Zn and Pb steam in the dust-containing tail gas to obtain first coal gas and Zn and Pb-containing mixture dust (the mixture dust can be used as a high-quality raw material for refining Zn and Pb, wherein the mass percentage of Zn in the zinc powder is 85%, and the mass percentage of Pb in the lead powder is 75%);
hot-pressing the direct reduced iron powder to obtain a hot-pressed iron block (HBI);
conveying the hot-pressed iron blocks to the top of a full-Oxygen Blast Furnace (OBF) through a high-temperature resistant skip car, adding the hot-pressed iron blocks into the OBF through a high-temperature resistant distributor at 400 ℃ according to a conventional blast furnace distributing method, and adding sinter, pellet or lump ore (the sinter, the pellet or the lump ore) according to smelting requirements of the full-oxygen blast furnace and the alkalinity of furnace slag (the specific alkalinity is 1.3) during charging,The temperature of the pellet ore or the lump ore is normal temperature (namely, extra heating or cooling is not needed), the adding amount is calculated according to the alkalinity of slag), 320kg of coke is added into each ton of molten iron, and refined gas is introduced (the refined gas is refined gas obtained by subsequent carbon dioxide separation treatment, the temperature of the refined gas is 830 ℃, the refined gas is annularly distributed at a position 10m high above an air outlet of the total-oxygen blast furnace, the refined gas is introduced from an upper air outlet which is uniform, and the using amount of the refined gas required by each ton of molten iron is 650Nm 3 ) Performing total oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag, and separating the molten iron/blast furnace slag in a molten iron ditch by using the density difference of the molten iron/blast furnace slag (the mass fraction of Fe in the molten iron)>95% by mass of C>4 percent; mass fraction of FeO in the blast furnace slag<1％)；
Carrying out carbon dioxide separation on the first coal gas and the coal gas to obtain refined coal gas and carbon dioxide, wherein the carbon dioxide is reused as a chemical raw material; one part of the refined gas is used for fluidized bed treatment and total oxygen blast furnace smelting, one part of the refined gas is combusted to provide heat for preheating of the refined gas used for fluidized bed treatment and total oxygen blast furnace smelting, and the rest part of the refined gas is used for external supply.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. A method for making iron by using zinc-containing and lead-containing iron ore powder is characterized by comprising the following steps:
carrying out fluidized bed treatment on the zinc-containing and lead-iron ore powder to obtain direct reduced iron powder and dust-containing tail gas;
carrying out hot pressing on the direct reduced iron powder to obtain a hot pressed iron block;
the hot-pressed iron blocks are hot-fed into a total-oxygen blast furnace for total-oxygen blast furnace smelting to obtain coal gas and molten iron/blast furnace slag;
carrying out carbon dioxide separation on the coal gas to obtain carbon dioxide and clean coal gas;
and recycling the refined gas for fluidized bed treatment and total oxygen blast furnace smelting.
2. The method of claim 1, wherein obtaining the dusty tail gas further comprises:
carrying out gas-solid separation on the dust-containing tail gas to obtain first coal gas and Zn-and Pb-containing dust;
carrying out first carbon dioxide separation on the first coal gas to obtain carbon dioxide and first refined coal gas;
and recycling the first clean coal gas for the fluidized bed treatment and the total oxygen blast furnace smelting.
3. The method according to claim 1, wherein the zinc-bearing, plumbite ore fines comprise the following components in mass percent: 30 to 50 percent of Fe, 2 to 10 percent of Zn, 1 to 5 percent of Pb and SiO 2 2-6 percent of CaO, 1-5 percent of CaO and the balance of water;
the grain size of the zinc-containing iron ore powder and the lead-containing iron ore powder is 0.1-2.0 mm.
4. The method as claimed in claim 1, wherein during the fluidized bed treatment, fine gas is introduced; the temperature of the refined gas is 800-900 ℃, and the flow of the refined gas required by each ton of zinc-containing and lead-containing iron ore powder is 2000-3000 Nm 3 (ii) a The time of the fluidized bed treatment is 15-20 min.
5. The method of claim 2, wherein the gas-solid separation is by condensation.
6. The method of claim 1, wherein the hot-pressing iron blocks are hot-fed to the total oxygen blast furnace by: and under the condition of 300-400 ℃, adding the hot-pressed iron blocks into the oxygen blast furnace layer by adopting a high-temperature resistant distributor, and simultaneously adjusting the alkalinity of materials in the total-oxygen blast furnace by adding sinter ore, pellet ore or lump ore and meeting the smelting requirement of the total-oxygen blast furnace.
7. The method of claim 6, wherein 200 to 400kg of coke is added per ton of molten iron.
8. The method of claim 1, 6 or 7, wherein the adding of the sintered ore, the pellet ore or the lump ore further comprises introducing oxygen and coal powder into the total oxygen blast furnace.
9. The method of claim 8, wherein the oxygen has a purity level>95 percent, the temperature of the oxygen is 900 to 1200 ℃, and the oxygen injection amount per ton of molten iron is 800 to 1400Nm 3 。
10. The method of claim 8, wherein the amount of pulverized coal injection required per ton of molten iron is 150 to 350kg.
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