CN112225542A - Method for prolonging service life of KR stirring paddle - Google Patents
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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- 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
- C21C1/02—Dephosphorising or desulfurising
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
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Abstract
The invention discloses a method for prolonging the service life of a KR stirring paddle, which comprises the following steps: cleaning the erosion part of the KR stirring paddle; the repair material is mixed into paste, the cleaned erosion part of the stirring paddle is repaired and the repair layer is sintered, and the repair material comprises the following components: 60-70% of alumina as a repair base material, 15-20% of magnesium oxide, 10-15% of tar as a binder and 5-10% of silicon carbide as a thermal shock resistant agent; the sintering treatment is divided into two stages, wherein the sintering temperature of the first stage is controlled to be 800-; in the second stage, the sintering temperature is controlled at 1200-1500 ℃, and the sintering time is controlled at 10-15 min; before the stirring paddle is inserted into molten iron, the whole stirring paddle is baked, the baking temperature is controlled to be 1000-1400 ℃, the baking time is controlled to be 30-60min, and the problems that the adhesion force between the existing refractory clay lumps and the stirring paddle matrix is weak and the refractory clay lumps are easy to fall off are solved. The invention can prolong the service life of the stirring paddle from the original average 240 times to 290 times at most, thereby reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of KR molten iron pretreatment, and particularly relates to a method for prolonging the service life of KR stirring paddles.
Background
The KR method has good desulfurization dynamic conditions, has a stable desulfurization rate of more than 90 percent in desulfurization effect, can realize deep desulfurization, and is suitable for smelting of extremely low-sulfur steel. However, as the stirring paddle is stirred and washed in high-temperature molten iron for a long time, local erosion can occur to the blades in the middle and later periods, so that the dynamic condition of desulfurization can be reduced, the service life of the stirring paddle can be shortened, and the bottleneck factor for restricting the running efficiency of the KR process is formed. In order to prolong the service life of the stirring paddle, the main method at present is to add a proper amount of water into the powdery repairing material to prepare a refractory mud mass, and then directly adhere the refractory mud mass to an erosion part.
Disclosure of Invention
The invention aims to provide a method for prolonging the service life of a KR stirring paddle, which can prevent a repairing material from separating from a stirring paddle matrix and losing the protection effect on an erosion part in the working process of the stirring paddle by improving the repairing material and a repairing method, thereby prolonging the service life of the KR stirring paddle.
In order to realize the purpose of the invention, the technical scheme of the invention is as follows:
a method for prolonging the service life of KR stirring paddle comprises the following steps:
the method comprises the following steps: cleaning the erosion part of the KR stirring paddle to expose the internal matrix material;
step two: uniformly mixing a repairing material, repairing the cleaned erosion part of the stirring paddle and sintering the repairing layer, wherein the repairing material comprises the following components in percentage by weight: 60-70% of alumina as a repair base material, 15-20% of magnesium oxide, 10-15% of tar as a binder and 5-10% of silicon carbide as a thermal shock resistant agent; the sintering treatment is divided into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled to be 800-; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled to be 1200-1500 ℃, and the sintering time is controlled to be 10-15 min;
step three: before the stirring paddle is inserted into the molten iron, the whole stirring paddle is baked, the baking temperature is controlled to be 1000-1400 ℃, and the baking time is controlled to be 30-60 min.
In the first step, cleaning treatment is carried out on the erosion part of the KR stirring paddle by using a spray gun for mixing high-pressure air with alumina particles, wherein the pressure of the high-pressure air is 0.2-0.6MPa, and the alumina particles are angular particles with equivalent diameters of 2-5 mm.
When the erosion depth is less than or equal to 10mm, 1 time of repairing and sintering treatment of the repairing layer is adopted, and the thickness of the repairing layer is 100% of the total depth of the erosion part. The particle sizes of all components in the repair material are as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes.
When the erosion depth is more than 10mm and less than or equal to 30mm, 2 times of repairing and sintering treatment of the repairing layer are adopted, wherein the thickness of the 1 st repairing layer is 40% -50% of the total depth of the erosion part, and the thickness of the 2 nd repairing layer is 50% -60% of the total depth of the erosion part. The granularity of each component in the 1 st repairing material is as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes; the granularity of each component in the 2 nd repairing material is as follows: the 100-200 meshes are 30-50%, the 50-100 meshes are 50-70%, and the particle size of the thermal shock resistant agent is 200-300 meshes; and the patching materials for different patching layers are respectively distributed into different high-pressure spraying devices.
When the erosion depth is more than 30mm, adopting 3 times of repairing and sintering treatment of the repairing layer, wherein the thickness of the 1 st repairing layer is 20% -40% of the total depth of the erosion part, and the thickness of the 2 nd repairing layer is 30% -40% of the total depth of the erosion part; the rest is the thickness of the 3 rd repairing layer. The granularity of each component in the 1 st repairing material is as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes; the granularity of each component in the 2 nd repairing material is as follows: the 100-200 meshes are 30-50%, the 50-100 meshes are 50-70%, and the particle size of the thermal shock resistant agent is 200-300 meshes; the particle sizes of all components in the 3 rd repairing material are as follows: the 100-200 meshes are 80-95%, the 50-100 meshes are 5-20%, and the particle size of the thermal shock resistant agent is 200-300 meshes; and the patching materials for different patching layers are respectively distributed into different high-pressure spraying devices.
The repairing is to use a high-pressure spraying device to spray the cleaned erosion part or the repaired layer after the previous sintering, and the sintering is to use an oxy-acetylene flame high-pressure spray gun to sinter the repaired layer completed this time.
The KR stirring paddle repaired by the method can obtain the following beneficial effects:
1) the service life of the stirring paddle can be prolonged from the average 240 times of the original process to the average 280 times, and the production cost is reduced;
2) in the KR molten iron desulphurization process, the dynamic conditions are stable, so that the desulphurization efficiency is in a relatively stable state;
3) the labor intensity of workers can be greatly reduced, and the potential safety hazard to operators and equipment caused by sudden slag dropping by adopting a manual hot compress method is eliminated;
4) the temperature drop influence of the stirring paddle on the molten iron can be reduced, and the treatment of the low-temperature molten iron is facilitated;
5) increase KR molten iron throughput, effective operating rate improves the output of steel.
Detailed Description
In order to prevent the repairing material from being separated from the stirring paddle base body and losing the protection effect on the erosion part in the working process of the stirring paddle, and further improve the service life of the KR stirring paddle, the best implementation mode is as follows:
example 1:
when the paddle of the stirring paddle is corroded on the non-iron-facing surface and the corrosion depth is 8mm, the mode of 1 time of sintering treatment of a repairing layer is adopted, and the specific method is as follows:
the method comprises the following steps: cleaning the erosion part of the KR stirring paddle at high pressure by using a spray gun for mixing alumina particles with high-pressure air, cleaning impurities attached to the surface of the erosion part, removing the surface layer (reaction layer) of the erosion part of the KR stirring paddle, and exposing the internal matrix material of the KR stirring paddle;
step two: uniformly mixing the repair materials, loading the mixture into a high-pressure spraying device, and spraying the cleaned erosion part for 1 time by using a spray gun, wherein the thickness of the sprayed repair layer is 100% of the total depth of the erosion part; sintering the repairing layer by using an oxyacetylene flame high-pressure spray gun, wherein the sintering is divided into two stages, the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 950 ℃, and the sintering time is controlled at 8 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1450 ℃, and the sintering time is controlled at 12 min;
step three: and before the stirring paddle is inserted into molten iron, baking the whole stirring paddle, wherein the baking temperature is controlled to be 1200 ℃, and the baking time is controlled to be 40min, so that the temperatures of the spraying repair part and the whole stirring paddle are in a uniform state, and the repairing operation of the KR stirring paddle is completed.
In the first step, the high-pressure air pressure is 0.3MPa, the equivalent diameter of the alumina particles is 2.6 +/-0.5 mm, and after the corroded part is cleaned, the exposed surface of the substrate is required to be a rough pockmarked surface. The components and the granularity ratio of the patching material in the second step are shown in the table 1.
TABLE 1 repair materials composition and content (%)
The 1-time repairing material comprises the following components in granularity ratio: the 200 meshes of 100-.
Example 2:
when the iron-facing surface of the stirring paddle blade is corroded to 25mm, the mode of 2 times of sintering treatment of a repairing and repairing layer is adopted, and the concrete method is as follows:
repair of erosion of iron-facing surface of paddle of stirring paddle
The method comprises the following steps: cleaning the erosion part of the KR stirring paddle at high pressure by using a spray gun for mixing alumina particles with high-pressure air, cleaning impurities attached to the surface of the erosion part, removing the surface layer (reaction layer) of the erosion part of the KR stirring paddle, and exposing the internal matrix material of the KR stirring paddle;
step two: uniformly mixing the repair materials with different particle size ratios and tar, subpackaging the mixture into different high-pressure spraying devices, spraying the cleaned erosion part for the 1 st time by using a spray gun, wherein the thickness of a repair layer is 45% of the total depth of the erosion part, sintering the spray repair layer by using an oxy-acetylene flame high-pressure spray gun, and the sintering is divided into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 900 ℃, and the sintering time is controlled at 6 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1400 ℃, and the sintering time is controlled at 11 min. Spraying the sintered repairing layer for the 2 nd time by using a spray gun, wherein the thickness of the 2 nd repairing layer is 55% of the total depth of the eroded part; sintering the spray repair layer by using an oxygen-acetylene flame high-pressure spray gun, wherein the sintering is divided into two stages, the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 920 ℃, and the sintering time is controlled at 7 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1430 ℃, and the sintering time is controlled at 12 min;
step three: and before the stirring paddle is inserted into molten iron, baking the whole stirring paddle, wherein the baking temperature is controlled to be 1200 ℃, and the baking time is controlled to be 50min, so that the temperatures of the spraying repair part and the whole stirring paddle are in a uniform state, and the repairing operation of the KR stirring paddle is completed.
In the first step, the high-pressure air pressure is 0.35MPa, the equivalent diameter of the alumina particles is 3.0 +/-0.5 mm, and after the corroded part is cleaned, the exposed surface of the substrate is required to be a rough pockmarked surface. The components and the granularity ratio of the patching material in the second step are shown in the table 2.
TABLE 2 repair materials composition and content (%)
The 1 st repairing material comprises the following components in granularity ratio: the 100-200 meshes are 85 percent, the 50-100 meshes are 15 percent, and the particle size of the thermal shock resistant agent is 200-300 meshes; the 2 nd mending material has the following requirements on the granularity of each component, and the base material for mending has the following requirements on the granularity ratio: the 200 meshes of 100-.
Example 3:
when the iron-facing surface of the stirring paddle blade is corroded to 40mm, the mode of repairing and sintering the repairing layer is adopted for 3 times, and the concrete method is as follows:
repair of erosion of iron-facing surface of paddle of stirring paddle
The method comprises the following steps: cleaning the erosion part of the KR stirring paddle at high pressure by using a spray gun for mixing alumina particles with high-pressure air, cleaning impurities attached to the surface of the erosion part, removing the surface layer (reaction layer) of the erosion part of the KR stirring paddle, and exposing the internal matrix material of the KR stirring paddle;
step two: uniformly mixing the repair materials with different particle size ratios and tar, subpackaging the mixture into different high-pressure spraying devices, spraying the cleaned erosion part for the 1 st time by using a spray gun, wherein the thickness of the 1 st repair layer is 30% of the total depth of the erosion part, sintering the spray repair layer by using an oxygen-acetylene flame high-pressure spray gun, and the sintering is divided into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 850 ℃, and the sintering time is controlled at 7 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1410 ℃, and the sintering time is controlled at 11 min. Spraying the sintered repairing layer for the 2 nd time by using a spray gun, wherein the thickness of the repairing layer for the 2 nd time is 35% of the total depth of an erosion part, sintering the repairing layer by using an oxy-acetylene flame high-pressure spray gun, and dividing the sintering into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 925 ℃, and the sintering time is controlled at 7 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1420 ℃, and the sintering time is controlled at 13 min. Spraying the sintered repairing layer for the 3 rd time by using a spray gun, wherein the thickness of the repairing layer for the 3 rd time is 35% of the total depth of an erosion part, sintering the repairing layer by using an oxy-acetylene flame high-pressure spray gun, and dividing the sintering into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled at 970 ℃, and the sintering time is controlled at 9 min; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled at 1480 ℃, and the sintering time is controlled at 14 min;
step three: before the stirring paddle is inserted into molten iron, baking the whole stirring paddle, wherein the baking temperature is controlled at 1250 ℃, and the baking time is controlled at 60min, so that the temperatures of the spraying repair part and the whole stirring paddle are in a uniform state, and the repairing operation of the KR stirring paddle is completed.
In the first step, the high-pressure air pressure is 0.45MPa, the equivalent diameter of the alumina particles is 3.5 +/-0.5 mm, and after the corroded part is cleaned, the exposed surface of the substrate is required to be a rough pockmarked surface. The components and the granularity ratio of the patching material in the second step are shown in the table 3.
TABLE 3 repair materials composition and content (%)
The 1 st repairing material comprises the following components in granularity ratio: the 100-200 meshes are 80%, the 50-100 meshes are 20%, and the particle size of the thermal shock resistant agent is 200-300 meshes; the 2 nd mending material has the following requirements on the granularity of each component, and the base material for mending has the following requirements on the granularity ratio: the 200 meshes of 100-; the granularity of each component in the 3 rd repairing material is required as follows: the 100-200 meshes are 90%, the 50-100 meshes are 10%, and the particle size of the thermal shock resistant agent is 200-300 meshes.
The effect of this method compared to the conventional method is shown in table 4.
TABLE 4 comparison of the effectiveness of KR paddles
| Method of producing a composite material | Life of the paddle, times | Efficiency of desulfurization% | Average temperature drop, deg.C |
| Conventional methods | 240 | 85.5 | 35.5 |
| Example 1 | 290 | 89.2 | 30.1 |
| Example 2 | 282 | 87.6 | 32.4 |
| Example 3 | 268 | 86.8 | 33.5 |
Claims (9)
1. A method for prolonging the service life of KR stirring paddle is characterized by comprising the following steps:
the method comprises the following steps: cleaning the erosion part of the KR stirring paddle to expose the internal matrix material;
step two: uniformly mixing a repairing material, repairing the cleaned erosion part of the stirring paddle and sintering the repairing layer, wherein the repairing material comprises the following components in percentage by weight: 60-70% of alumina as a repair base material, 15-20% of magnesium oxide, 10-15% of tar as a binder and 5-10% of silicon carbide as a thermal shock resistant agent; the sintering treatment is divided into two stages, wherein the first stage is a low-temperature sintering stage, the sintering temperature is controlled to be 800-; the second stage is a high-temperature sintering stage, wherein the sintering temperature is controlled to be 1200-1500 ℃, and the sintering time is controlled to be 10-15 min;
step three: before the stirring paddle is inserted into the molten iron, the whole stirring paddle is baked, the baking temperature is controlled to be 1000-1400 ℃, and the baking time is controlled to be 30-60 min.
2. The method of claim 1, wherein the erosion site of the KR stirring paddle in the first step is cleaned by a spray gun mixing alumina particles with high pressure air, wherein the high pressure air is 0.2-0.6MPa, and the alumina particles are angular particles with an equivalent diameter of 2-5 mm.
3. The method of claim 1, wherein 1 time of repairing and sintering treatment of the repairing layer is performed when the erosion depth is less than or equal to 10mm, and the thickness of the repairing layer is 100% of the total depth of the erosion portion.
4. The method for prolonging the service life of KR stirring paddle according to claim 1, wherein when the erosion depth is 10 ≤ 30mm, 2 times of repairing and sintering processes are performed, wherein the thickness of the 1 st repairing layer is 40% -50% of the total depth of the erosion portion, and the thickness of the 2 nd repairing layer is 50% -60% of the total depth of the erosion portion.
5. The method for prolonging the service life of KR stirring paddle according to claim 1, wherein when the erosion depth is greater than 30mm, 3 times of repairing and sintering treatment of repairing layer are adopted, the thickness of the 1 st repairing layer is 20% -40% of the total depth of the erosion part, and the thickness of the 2 nd repairing layer is 30% -40% of the total depth of the erosion part; the rest is the thickness of the 3 rd repairing layer.
6. The method for prolonging the service life of KR stirring paddle according to any of claims 1 to 5, wherein the repairing is performed by spraying the cleaned erosion part or the repaired layer after the previous sintering with a high pressure spraying device, and the sintering is performed by sintering the repaired layer completed this time with an oxy-acetylene flame high pressure spray gun.
7. The method for prolonging the service life of the KR stirring paddle according to claim 3, wherein the particle sizes of the components in the repair material are as follows, and the particle size of the repair base material is as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes.
8. The method for prolonging the service life of the KR stirring paddle according to claim 4, wherein the particle sizes of the components in the repair material 1 are as follows, and the particle size of the repair base material is as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes; the granularity of each component in the 2 nd repairing material is as follows: the 100-200 meshes are 30-50%, the 50-100 meshes are 50-70%, and the particle size of the thermal shock resistant agent is 200-300 meshes; and the patching materials for different patching layers are respectively distributed into different high-pressure spraying devices.
9. The method for prolonging the service life of the KR stirring paddle according to claim 5, wherein the particle sizes of the components in the repair material 1 are as follows, and the particle size of the repair base material is as follows: 75-85% of 100-200 meshes, 15-25% of 50-100 meshes, and the particle size of the thermal shock resistant agent: 200-300 meshes; the granularity of each component in the 2 nd repairing material is as follows: the 100-200 meshes are 30-50%, the 50-100 meshes are 50-70%, and the particle size of the thermal shock resistant agent is 200-300 meshes; the particle sizes of all components in the 3 rd repairing material are as follows: the 100-200 meshes are 80-95%, the 50-100 meshes are 5-20%, and the particle size of the thermal shock resistant agent is 200-300 meshes; and the patching materials for different patching layers are respectively distributed into different high-pressure spraying devices.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114292114A (en) * | 2021-12-08 | 2022-04-08 | 鞍钢股份有限公司 | Method for preheating stirring paddle by Rhine method |
| CN115029510A (en) * | 2022-06-20 | 2022-09-09 | 山东钢铁股份有限公司 | Desulfurization method based on dynamic parameter adjustment in service life of KR stirring paddle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114292114A (en) * | 2021-12-08 | 2022-04-08 | 鞍钢股份有限公司 | Method for preheating stirring paddle by Rhine method |
| CN115029510A (en) * | 2022-06-20 | 2022-09-09 | 山东钢铁股份有限公司 | Desulfurization method based on dynamic parameter adjustment in service life of KR stirring paddle |
| CN115029510B (en) * | 2022-06-20 | 2023-07-04 | 山东钢铁股份有限公司 | Desulfurization method based on dynamic parameter adjustment during service life of KR stirring paddle |
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