CN114264157A - Method for prolonging service life of submerged arc furnace body - Google Patents
Method for prolonging service life of submerged arc furnace body Download PDFInfo
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- CN114264157A CN114264157A CN202111572641.0A CN202111572641A CN114264157A CN 114264157 A CN114264157 A CN 114264157A CN 202111572641 A CN202111572641 A CN 202111572641A CN 114264157 A CN114264157 A CN 114264157A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 106
- 230000004907 flux Effects 0.000 claims abstract description 38
- 238000003723 Smelting Methods 0.000 claims abstract description 30
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 26
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 18
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 18
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 18
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 18
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims abstract description 17
- 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 16
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 16
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 15
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 11
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 11
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 239000011819 refractory material Substances 0.000 description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 5
- 239000011449 brick Substances 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 1
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
A method for prolonging the service life of a furnace body of a submerged arc furnace comprises the following steps: collecting ferrochromium slag as slag; adding serpentine or magnesite into the recycled slag to be used as slag adhering flux; the slag adhering flux comprises the following components: 3.31-5.09% of Cr by weight percentage2O315.74-31.33% of SiO21.91-2.50% of CaO, 33.07-37.95% of MgO and 15.62-18.71% of Al2O3And the balance of impurities; the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall; and adjusting the secondary voltage of the submerged arc furnace, and melting the slag-hanging flux along with the normal smelting and attaching the slag-hanging flux to the furnace wall to form 'wall-hanging slag'. The method can prolong the service life of the furnace body of the submerged arc furnace, reduce the smelting cost of the ferrochrome alloy and maintain the normal production process.
Description
Technical Field
The invention belongs to the technical field of ferroalloy smelting, and particularly relates to a method for prolonging the service life of a furnace body of a submerged arc furnace.
Background
In the smelting process of the high-carbon ferrochrome, the temperature of an alloy molten pool in the center of the submerged arc furnace can reach more than 1600 ℃, the temperature of a slag layer on the upper part of the alloy molten pool can be higher, and due to the high smelting temperature and the strong slag iron permeability, the interaction among slag, metal and refractory materials can cause serious erosion of a furnace lining, so that the service life of the submerged arc furnace is shortened, and the submerged arc furnace is in an unstable state. At present, the furnace lining of the ferrochrome smelting submerged arc furnace is made of three refractory materials, namely high-alumina bricks, magnesia bricks and carbon bricks. In the actual smelting and tapping processes, the refractory material of the furnace lining can be damaged by the erosion action, chemical erosion, physical damage and the like of high-temperature melt, and if the refractory material is not processed in time, the local temperature of the furnace wall is overhigh in serious conditions, even a production safety accident that the furnace wall is burnt through is caused.
At present, the method for prolonging the service life of the submerged arc furnace mainly changes the material of refractory materials in a hearth and the stacking mode of refractory bricks. However, the method increases the smelting cost of ferrochrome alloy, and the furnace shutdown operation is required for maintaining and replacing the refractory material every time, which seriously affects the normal production process.
Disclosure of Invention
The invention aims to provide a method for prolonging the service life of a submerged arc furnace body, which can prolong the service life of the submerged arc furnace body, reduce the smelting cost of ferrochrome and maintain the normal production process.
In order to achieve the purpose, the invention provides a method for prolonging the service life of a furnace body of a submerged arc furnace, which comprises the following steps:
(1) collecting ferrochromium slag as slag;
(2) adding serpentine or magnesite into the recycled slag to be used as slag hanging flux, wherein the mass ratio of the serpentine or magnesite to the recycled slag is (0.5-7): 1, the slag adhering flux comprises the following components:
3.31-5.09% of Cr by weight percentage2O315.74-31.33% of SiO21.91-2.50% of CaO, 33.07-37.95% of MgO and 15.62-18.71% of Al2O3And the balance of impurities;
(3) the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall;
(4) after the secondary voltage of the submerged arc furnace is adjusted to be 150-170V, the viscosity of the slag adhering flux is reduced from 35pa to 25pa, and the slag adhering flux is melted along with normal smelting and adheres to the furnace wall to form 'wall adhering slag'.
Preferably, in the step (1), the recycled slag contains the following components: 5.63-7.63% of Cr by weight2O326.76 to 28.76 percent of SiO23.24 to 3.75 percent of CaO, 32.11 to 33.02 percent of MgO and 26.56 to 28.07 percent of Al2O3And the balance of impurities.
Preferably, in the step (2), the serpentine contains 35-40% of MgO and 35-40% of SiO in percentage by weight2。
Preferably, in step (2), MgCO is present in magnesite3Is at least 92 wt%.
Preferably, in the step (1), the ferrochromium slag is sourced from a tapping chute, a tundish and a slag pot in the tapping process.
Compared with the prior art, the invention has the following advantages:
(1) the recycled slag component adopted by the invention mainly comprises Cr2O3、MgO、Al2O3、SiO2The CaO is taken as the main component, and various oxides contained in the recycled slag mainly come from chromite and smelting auxiliary materials (serpentine, bluestone, silica and the like) and are collected from a tapping chute, a tundish and a slag pot in the daily tapping process, so that the recycled slag is convenient to obtain;
(2) the invention adjusts MgO and Al in the slag-adhering flux2O3The content proportion of the components ensures that the slag has proper viscosity and higher melting point in the furnace, thereby ensuring that the recycled slag can be effectively stuck and hung on a furnace lining to form a protective layer in the submerged arc furnace, and being beneficial to the thickness of a wall-hanging slag layerDegree accumulation;
(3) the invention makes use of the mutual reaction between the slag adhering flux and the slag in the submerged arc furnace during the ferrochrome alloy smelting, so that MgO in the slag adhering flux and Cr in the slag in the submerged arc furnace2O3Magnesia-chrome spinel phase wall-hanging slag with the melting temperature higher than 2100 ℃ is generated in any proportion, so that the furnace wall is protected from high-temperature erosion of the submerged arc furnace slag, and the service life of the submerged arc furnace is prolonged; (4) compared with the traditional submerged arc furnace smelting process, the method prolongs the service life of the submerged arc furnace body by 10-20%, reduces the smelting cost of the ferrochrome alloy, and maintains the normal production process.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example one
A method for prolonging the service life of a furnace body of a submerged arc furnace comprises the following steps:
(1) collecting ferrochromium slag as slag; the ferrochromium slag is from a tapping chute, a tundish and a slag pot in the tapping process; the recycled slag comprises the following components: 5.63% Cr by weight2O3，26.76％SiO23.24% of CaO, 32.11% of MgO and 26.56% of Al2O3And the balance of impurities;
(2) adding serpentine or magnesite into the recycled slag to be used as slag adhering flux; the mass ratio of the serpentine or the magnesite to the recycled slag is 0.7: the serpentine contains 35% of MgO and 35% of SiO by weight2(ii) a MgCO in magnesite3Is at least 92 wt%; the slag adhering flux comprises the following components:
3.31% Cr by weight2O315.74% SiO21.91% CaO, 33.07% MgO, 15.62% Al2O3And the balance of impurities;
(3) the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall;
(4) adjusting the electric parameters of the submerged arc furnace, wherein the secondary voltage in the electric parameters of the submerged arc furnace is reduced by 10% compared with normal smelting, the secondary voltage is 150V, the arc length is reduced, the viscosity of the slag adhering flux is reduced from 35pa to 25pa, the slag adhering flux is melted along with the normal smelting and adheres to the furnace wall to form wall-hanging slag, and the wall-hanging slag comprises the following components:
7.12% by weight of Cr2O315.14% of SiO26.01 percent of CaO, 42.23 percent of MgO and 9.20 percent of Al2O3、5.07％Fe2O3And the balance of impurities;
the slag adhering flux can react with the slag and molten iron in the normal smelting process again to form wall-hanging slag, so compared with the slag adhering flux, MgO and Cr in the wall-hanging slag form2O3Increased CaO content, SiO2、Al2O3The content is reduced, and Fe is also increased after the reaction with raw ore and molten iron2O3And (3) components.
Example two
A method for prolonging the service life of a furnace body of a submerged arc furnace comprises the following steps:
(1) collecting ferrochromium slag as slag; the ferrochromium slag is from a tapping chute, a tundish and a slag pot in the tapping process; the recycled slag comprises the following components: 6.60% Cr by weight2O3，27.70％SiO23.52 percent of CaO, 32.67 percent of MgO and 27.25 percent of Al2O3And the balance of impurities;
(2) adding serpentine or magnesite into the recycled slag to be used as slag adhering flux; the mass ratio of the serpentine or the magnesite to the recycled slag is 0.6: the serpentine contains 37 weight percent of MgO and 37 weight percent of SiO2(ii) a MgCO in magnesite3Is at least 92 wt%; the slag adhering flux comprises the following components:
4.13% by weight of Cr2O328.32% SiO22.20% CaO, 35.68% MgO, 17.03% Al2O3And the balance of impurities;
(3) the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall;
(4) adjusting the electric parameters of the submerged arc furnace, wherein the secondary voltage in the electric parameters of the submerged arc furnace is reduced by 10% compared with normal smelting, the secondary voltage is 160V, the arc length is reduced, the viscosity of the slag adhering flux is reduced from 35pa to 25pa, the slag adhering flux is melted along with the normal smelting and adheres to the furnace wall to form wall-hanging slag, and the wall-hanging slag comprises the following components:
8.13% by weight of Cr2O322.05% of SiO27.26% of CaO, 43.17% of MgO and 10.03% of Al2O3、6.14％Fe2O3And the balance of impurities;
the slag adhering flux can react with the slag and molten iron in the normal smelting process again to form wall-hanging slag, so compared with the slag adhering flux, MgO and Cr in the wall-hanging slag form2O3Increased CaO content, SiO2、Al2O3The content is reduced, and Fe is also increased after the reaction with raw ore and molten iron2O3And (3) components.
EXAMPLE III
A method for prolonging the service life of a furnace body of a submerged arc furnace comprises the following steps:
(1) collecting ferrochromium slag as slag; the ferrochromium slag is from a tapping chute, a tundish and a slag pot in the tapping process; the recycled slag comprises the following components: 7.63% by weight of Cr2O3，28.76％SiO23.75 percent of CaO, 33.02 percent of MgO and 28.07 percent of Al2O3And the balance of impurities;
(2) adding serpentine or magnesite into the recycled slag to be used as slag adhering flux; the mass ratio of the serpentine or the magnesite to the recycled slag is 0.5: the serpentine contains 40% of MgO and 40% of SiO by weight percentage2(ii) a MgCO in magnesite3Is at least 92 wt%; the slag adhering flux comprises the following components:
5.09% Cr by weight2O331.33% of SiO22.50% of CaO, 37.95% of MgO and 18.71% of Al2O3And the balance of impurities;
(3) the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall;
(4) adjusting the electric parameters of the submerged arc furnace, wherein the secondary voltage in the electric parameters of the submerged arc furnace is reduced by 10% compared with normal smelting, the secondary voltage is 170V, the arc length is reduced, the viscosity of the slag adhering flux is reduced from 35pa to 25pa, the slag adhering flux is melted along with the normal smelting and adheres to the furnace wall to form wall-hanging slag, and the wall-hanging slag comprises the following components:
9.31% Cr by weight2O323.21% SiO28.08 percent of CaO, 44.12 percent of MgO and 11.09 percent of Al2O3、7.03％Fe2O3And the balance of impurities;
the slag adhering flux can react with the slag and molten iron in the normal smelting process again to form wall-hanging slag, so compared with the slag adhering flux, MgO and Cr in the wall-hanging slag form2O3Increased CaO content, SiO2、Al2O3The content is reduced, and Fe is also increased after the reaction with raw ore and molten iron2O3And (3) components.
Claims (5)
1. A method for prolonging the service life of a furnace body of a submerged arc furnace is characterized by comprising the following steps:
(1) collecting ferrochromium slag as slag;
(2) adding serpentine or magnesite into the recycled slag to be used as slag hanging flux, wherein the mass ratio of the serpentine or magnesite to the recycled slag is (0.5-0.7): 1, the slag adhering flux comprises the following components:
3.31-5.09% of Cr by weight percentage2O315.74-31.33% of SiO21.91-2.50% of CaO, 33.07-37.95% of MgO and 15.62-18.71% of Al2O3And the balance of impurities;
(3) the slag adhering flux is fed to the periphery of the inner wall of the hearth along a feed opening at the top of the submerged arc furnace, and is transferred to the normal ferrochrome smelting process after being uniformly distributed on the surface of the furnace wall;
(4) after the secondary voltage of the submerged arc furnace is adjusted to be 150-170V, the viscosity of the slag adhering flux is reduced from 35pa to 25pa, and the slag adhering flux is melted along with normal smelting and adheres to the furnace wall to form 'wall adhering slag'.
2. The method for prolonging the service life of the furnace body of the submerged arc furnace as claimed in claim 1, wherein in the step (1), the recycled slag comprises the following components:
5.63-7.63% of Cr by weight2O3，26.76～28.76％SiO2、3.24～3.75％CaO、32.11～33.02％MgO、26.56～28.07％Al2O3And the balance of impurities.
3. The method for prolonging the service life of the furnace body of the submerged arc furnace as claimed in claim 1 or 2, wherein in the step (2), the serpentine comprises 35-40% of MgO and 35-40% of SiO by weight2。
4. The method for prolonging the service life of the furnace body of the submerged arc furnace as claimed in claim 1 or 2, wherein in the step (2), MgCO in magnesite3Is at least 92 wt%.
5. The method for prolonging the service life of the furnace body of the submerged arc furnace according to the claim 1 or 2, characterized in that in the step (1), the ferrochrome slag is sourced from a tapping chute, a tundish and a slag pot in the tapping process.
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