CN110643760B - Ultrahigh Al2O3Blast furnace smelting method of furnace slag - Google Patents
Ultrahigh Al2O3Blast furnace smelting method of furnace slag Download PDFInfo
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- CN110643760B CN110643760B CN201910942502.9A CN201910942502A CN110643760B CN 110643760 B CN110643760 B CN 110643760B CN 201910942502 A CN201910942502 A CN 201910942502A CN 110643760 B CN110643760 B CN 110643760B
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- slag
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- smelting method
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- 239000002893 slag Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract description 7
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 229910052742 iron Inorganic materials 0.000 claims description 13
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 7
- 229910052796 boron Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses an ultrahigh Al2O3The blast furnace smelting method of the furnace slag comprises 10-16% of MgO and Al by mass2O330-40% and FeO 1-2.5%(ii) a The binary basicity R2 of the slag is 0.8-0.9; controlling blast temperature of the blast furnace to be more than 1250 ℃; adding converter slag into pulverized coal blown by a blast furnace, controlling the coal ratio at 50-80 kg/thm, controlling the blowing amount of the converter slag at 40-80 kg/thm, wherein the mass percentages of FeO and MgO in the converter slag are respectively more than 10% and 6%; controlling the oxygen enrichment rate of blast furnace hot air to be more than 8%; the slag temperature is greater than 1600 ℃.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to ultrahigh Al2O3A blast furnace smelting method of furnace slag.
Background
Under the background that the steel industry is influenced by conditions such as excess productivity and the like, the market performance is low, so that the cost reduction becomes the first work for keeping the survival of various steel plants, and a trend that a blast furnace is matched with high-aluminum low-price ores in large quantity is formed. However, when blast furnaces use high-alumina ore in large quantities, this results in increased slag viscosity, difficulty in tapping and tapping the blast furnace, and increased fuel consumption. Therefore, in order to use a large amount of high-alumina ore and effectively reduce the production cost of the blast furnace, the high-alumina ore is basically matched with a large amount of low-alumina ore for use, and finally, Al in blast furnace slag is added2O3The content is controlled below 16%. However, this dilution "Al in slag2O3The use method of the high-alumina ore limits the use of the high-alumina ore in large quantity, and the production cost of the blast furnace is difficult to be greatly reduced.
In recent years, with the increasing importance of various steel plants on reducing the production cost of blast furnaces, new methods for using high-alumina ore in large proportion are continuously proposed:
CN201410557803.7 (a blast furnace slag system for blast furnace smelting) discloses a high-alumina slag system for blast furnace smelting. The invention innovatively utilizes Al on the premise of meeting the performance requirement of the blast furnace smelting slag system2O3By its own action in the slag system, with Al2O3Replace SiO in the existing slag system2While reducing SiO2The content of Al in the slag can be obtained by changing the traditional aluminosilicate slag system for high-alumina smelting into the aluminosilicate slag system, utilizing the current blast furnace to smelt high-alumina ore varieties and matching with other iron ores2O3The slag system reaches 20 to 30 percent or even higher, and the requirement of blast furnace smelting slag system is met. However, the slag system slag has poor stability, and the viscosity of the slag is greatly changed by component fluctuation and temperature fluctuation in the blast furnace, so that the stable and smooth operation of the blast furnace is influenced.
CN201110190772.2 (a method for improving the fluidity of high-alumina slag in the blast furnace ironmaking process) discloses a method for improving the fluidity of high-alumina slag in the blast furnace ironmaking process, which comprises the following steps: firstly, in the blast furnace ironmaking process, the boron-containing iron ore concentrate is used for partially replacing iron ore powder, and 8-27% of the boron-containing iron ore concentrate respectively contains more than or equal to 50% of Fe and B2O3The method comprises the following steps of preparing a mixture of boron-containing iron concentrate with the concentration of less than or equal to 10%, 8-15% of flux, 2.5-4.5% of fuel and 53-82% of iron ore powder, conveying the mixture to a sintering machine for sintering to obtain boron-containing sintered ore, smelting the boron-containing sintered ore by using a blast furnace, separating iron and boron of the boron-containing sintered ore, enabling boron oxide to enter blast furnace slag to improve the fluidity of the slag, and solving the problems of thick slag and poor molten iron desulphurization effect caused by smelting high-alumina slag by using the blast furnace.
The above patent has a disadvantage in that B in iron ore increases slag fluidity although the above patent can reduce slag viscosity2O3Can not enter the slag by 100 percent, and has a part B2O3The B is reduced into B and enters into slag, which can affect the production of subsequent special steel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the ultrahigh Al2O3Blast furnace smelting method of slag, which can lead Al in the slag2O3The mass percentage content is increased to 30-40%, the use proportion of low-price high-aluminum ores can be greatly increased, and the blast furnace iron-making cost is greatly reduced.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
ultrahigh Al2O3The blast furnace smelting method of the furnace slag is characterized by comprising the following steps: the slag contains 10-16% of MgO and Al according to mass percentage2O330-40% of FeO and 1-2.5% of FeO; the binary basicity R2 of the slag is 0.8-0.9; controlling blast temperature of the blast furnace to be more than 1250 ℃; adding converter slag into pulverized coal blown by a blast furnace, controlling the coal ratio at 50-80 kg/thm, controlling the blowing amount of the converter slag at 40-80 kg/thm, wherein the mass percentages of FeO and MgO in the converter slag are respectively more than 10% and 6%; the oxygen enrichment rate of the blast furnace hot air is controlled to be more than 8 percent.
The slag temperature is greater than 1600 ℃.
The blast kinetic energy of the blast furnace is more than 140 KJ/s.
The mass percentage of the part of the converter slag with the granularity of less than 0.074mm is more than or equal to 78 percent.
The mass percentage of Al2O3 in the iron ore in the blast furnace smelting process is 7-15%.
The principle of the invention is as follows: the viscosity of the slag is mainly influenced by the composition and temperature of the slag, when Al in the slag2O3When the content is increased, the slag viscosity increases and the fluidity deteriorates. Therefore, in the blast furnace smelting of high-alumina ore, Al in the slag is generally controlled2O3The content is less than 15 percent, so that the stable and smooth operation of the blast furnace is ensured, and the charging proportion of the high-alumina ore is limited. When the blast furnace slag content is increased to 30%, it is necessary to adjust not only the slag composition but also the slag temperature to ensure the viscosity and fluidity of the slag. The invention reduces the binary alkalinity, and reduces the CaO in the blast furnace slag which is easy to react with SiO2Generates a high melting point substance of wollastonite (2 CaO. SiO)2Melting point 2150 ℃ C.). Meanwhile, converter slag is blown into the slag, so that the FeO content in the slag is ensured, and the slag plays a role of a fluxing agent; and the coal injection quantity is reduced, the coal dust is ensured to be completely combusted, and the coal dust which is not combusted is prevented from enteringAnd the slag is added to reduce the fluidity of the slag. In addition, the theoretical combustion temperature is increased by increasing the air temperature and the oxygen enrichment rate, so that the temperature of the slag in the hearth is increased, the fluidity of the slag can be obviously improved, and the viscosity of the slag is reduced.
Compared with the prior art, the invention has the beneficial effects that: 1. the invention can greatly increase the usage amount of low-price high-alumina ore and reduce the cost of blast furnace charging raw materials, thereby reducing the blast furnace ironmaking cost; 2. the invention does not need to add flux such as fluorite, manganese ore and the like into the blast furnace burden; 3. can recycle the steelmaking converter slag, and is beneficial to energy conservation and emission reduction of steel plants.
Detailed Description
The following description is given with reference to specific examples:
high Al in examples2O3The iron ore is low-value lump ore from Australia, and Al in the ore2O3The content is 7-15%. The furnace charge material parameters, blast furnace control parameters and molten iron ingredients are shown in tables 1, 2 and 3. The number 1 is a control parameter for smelting common high-alumina slag, and the numbers 2, 3 and 4 are blast furnace slag components and blast furnace parameters controlled by the method of the invention.
TABLE 1 composition of charged raw materials
TABLE 2 blast furnace control parameters
TABLE 3 blast furnace ironmaking water composition, wt%
| Numbering | C | Si | S | P |
| 1 | 5.2 | 0.4 | 0.03 | 0.07 |
| 2 | 4.9 | 0.4 | 0.04 | 0.08 |
| 3 | 4.8 | 0.5 | 0.03 | 0.08 |
| 4 | 5.2 | 0.6 | 0.04 | 0.09 |
Claims (5)
1. Ultrahigh Al2O3Blast furnace smelting method for furnace slagThe method is characterized in that: the slag contains 10-14.78% of MgO and Al according to mass percentage2O3 31.66-40% and FeO 1-2.5%; the binary basicity R2 of the slag is 0.8-0.9; controlling blast temperature of the blast furnace to be more than 1250 ℃; adding converter slag into pulverized coal blown by a blast furnace, controlling the coal ratio to be 50-80 kg/t, controlling the blowing amount of the converter slag to be 40-80 kg/t, and respectively enabling the mass percentages of FeO and MgO in the converter slag to be more than 10% and 6%; the oxygen enrichment rate of the blast furnace hot air is controlled to be more than 8 percent.
2. Ultra-high Al according to claim 12O3The blast furnace smelting method of the furnace slag is characterized by comprising the following steps: the slag temperature is greater than 1600 ℃.
3. Ultra-high Al according to claim 12O3The blast furnace smelting method of the furnace slag is characterized by comprising the following steps: the mass percentage of the part of the converter slag with the granularity of less than 0.074mm is more than or equal to 78 percent.
4. Ultra-high Al according to claim 12O3The blast furnace smelting method of the furnace slag is characterized by comprising the following steps: the blast kinetic energy of the blast furnace is more than 140 KJ/s.
5. Ultra-high Al according to claim 12O3The blast furnace smelting method of the furnace slag is characterized by comprising the following steps: al of the iron ore in the blast furnace smelting process2O3The mass percentage content is 7-15%.
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| CN201910942502.9A CN110643760B (en) | 2019-09-30 | 2019-09-30 | Ultrahigh Al2O3Blast furnace smelting method of furnace slag |
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| CN201910942502.9A CN110643760B (en) | 2019-09-30 | 2019-09-30 | Ultrahigh Al2O3Blast furnace smelting method of furnace slag |
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| CN110643760A CN110643760A (en) | 2020-01-03 |
| CN110643760B true CN110643760B (en) | 2021-04-27 |
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| CN112048349B (en) * | 2020-09-09 | 2021-10-22 | 鞍钢股份有限公司 | Blast furnace coal powder injection combustion improver and preparation and use methods thereof |
| CN115449574B (en) * | 2022-08-30 | 2023-06-20 | 鞍钢股份有限公司 | Ultra-high Al for blast furnace smelting 2 O 3 Slag method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62202012A (en) * | 1986-02-28 | 1987-09-05 | Sumitomo Metal Ind Ltd | Method for recovering mn in converter blown slag |
| CN103757165A (en) * | 2014-02-11 | 2014-04-30 | 东北大学 | Comprehensive valuable component utilization method of blast-furnace smelting of high iron bauxite |
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| CN104278118A (en) * | 2014-10-24 | 2015-01-14 | 山东钢铁股份有限公司 | Method of using waste magnesia carbon bricks in blast furnace iron making to improve performances of blast-furnace slag |
| CN108315516A (en) * | 2018-05-11 | 2018-07-24 | 鞍钢股份有限公司 | Ultrahigh aluminum slag system for blast furnace smelting |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62202012A (en) * | 1986-02-28 | 1987-09-05 | Sumitomo Metal Ind Ltd | Method for recovering mn in converter blown slag |
| CN103757165A (en) * | 2014-02-11 | 2014-04-30 | 东北大学 | Comprehensive valuable component utilization method of blast-furnace smelting of high iron bauxite |
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