CN117887924A - Method for preventing converter from sticking scrap steel in ultra-low iron loss production mode - Google Patents
Method for preventing converter from sticking scrap steel in ultra-low iron loss production mode Download PDFInfo
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- CN117887924A CN117887924A CN202410073279.XA CN202410073279A CN117887924A CN 117887924 A CN117887924 A CN 117887924A CN 202410073279 A CN202410073279 A CN 202410073279A CN 117887924 A CN117887924 A CN 117887924A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 55
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 46
- 239000001301 oxygen Substances 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 46
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 41
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 22
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 22
- 239000004571 lime Substances 0.000 claims abstract description 22
- 238000005502 peroxidation Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000010882 bottom ash Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims 2
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 8
- 238000009529 body temperature measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to the technical field of converter steelmaking, and particularly discloses a method for preventing converter from sticking scrap steel in an ultra-low iron loss production mode, which comprises the following steps: s1, after the open-blowing half-oxygen period of converter production is finished, controlling oxygen blowing pressure and gun position; s2, controlling the carbon gun position and oxygen blowing pressure at the end point by the oxygen blowing end point, and controlling the gun pressing time; s3, observing the state of molten steel in the converter to judge whether an oxygen blowing end point of the molten steel is over-oxidized or not; s4, when the slag is thin after the slag splashing of the peroxidation furnace time is finished, lime is added to thicken the slag, and furnace shaking operation is carried out; s5, detecting the temperature of molten steel in the converter, and adding lime and scrap steel at the same time; s6, paying attention to the change condition of the converter bottom and reporting to a workshop, and the workshop adjusts the converter bottom blowing parameters according to actual conditions to ensure bottom blowing flow; the invention can effectively avoid the sticking of scrap steel in the furnace, improve the accuracy of the terminal temperature components, reduce the frequency of supplementary blowing and reduce the risks of production accidents and quality accidents.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a method for preventing converter from sticking scrap steel in an ultralow-iron-loss production mode.
Background
Under the condition of certain blast furnace ironmaking productivity, the converter is an important way to improve steelmaking productivity and adopt a production mode with low iron consumption and high scrap ratio. The steel works of Shandong iron and steel group Yongfeng Lingang Limited company adopts a long-flow process route of converter-LF refining furnace-continuous casting, and adopts an ultra-low iron loss production mode that the iron loss is less than or equal to 720kg/t for improving the steelmaking productivity.
In the ultra-low iron loss production mode, the proportion of the scrap steel is adjusted to realize heat balance, the consumption of iron blocks is increased in the scrap steel, and the carbon element in the iron blocks and oxygen blown into the furnace are utilized to generate oxidation reaction to release heat to provide heat for a converter molten pool. And (3) carrying out heat balance calculation according to the temperature components of molten iron and the proportion condition of scrap steel, and carrying out heat compensation by adopting coal blocks when the estimated heat is insufficient.
The slag-retaining operation mode under the dry dedusting condition is adopted in the converter steelmaking of the company, and after the slag splashing of the converter is finished, part or all of slag is retained in the converter, so that the in-converter sticky scrap steel is easy to appear in the case. After the consumption of iron blocks is increased in the proportion of the scrap steel, the iron blocks in the scrap steel are easier to adhere to the slag pouring surface or the furnace bottom of the converter compared with the scrap steel, so that the melting speed of the iron blocks is influenced, the iron blocks which are not melted at the end point are also caused, and the carbon pulling temperature is lower. The iron blocks adhered in the furnace are required to be melted by the heat of molten steel in the process of temperature measurement and sampling of the furnace pouring.
The existing converter smelting mainly has the following problems:
1. The slag pouring surface of the pouring furnace or iron blocks and scrap steel adhered to the bottom of the furnace are melted, the working time of the working procedure is influenced, and the production order is influenced.
2. When the iron blocks or scrap steel are poured into the furnace to be melted, a large amount of temperature drop can be caused, the temperature needs to be blown up and raised, so that the molten steel is peroxidized, the yield of the molten steel is affected, the corrosion of a furnace lining is aggravated, and the slag splashing furnace protection effect is affected.
3. In the process of melting the iron blocks adhered on the slag pouring surface by the pouring furnace, carbon elements in the iron blocks enter molten steel to cause carburetion of the molten steel, and if carburant is added according to an oxidation sample to adjust carbon components, the risk of quality accidents caused by exceeding carbon content of the molten steel exists.
4. If the melting of the scrap steel adhered in the furnace is incomplete, the amount of molten steel is reduced, and the operation of the refining furnace is affected. If the adhered scrap steel in the subsequent furnace is melted, the molten steel amount is increased, so that the steel ladle clearance is ensured to be convenient for the operation of the refined furnace, even steel is required to be remained in the furnace, the slag splashing furnace protection is influenced, and the blasting risk exists when the scrap steel is added to the molten iron. Moreover, the fluctuation of the molten steel quantity among the heat is large, which can cause impact on the production order stability of the whole process and is unfavorable for the production organization.
5. If the scrap steel is adhered to the bottom of the converter, the converter bottom blowing can be blocked to a certain extent, the converter bottom blowing effect is influenced, the converter slagging effect is influenced, the temperature components of the molten steel at the end point are not uniform easily, and the risk of production accidents exists.
Therefore, a method for preventing the converter from sticking scrap steel in the ultra-low iron loss production mode is needed to be designed so as to solve the problem that the converter bottom of the existing converter is easy to stick scrap steel.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for preventing converter from sticking scrap steel in an ultralow-iron-loss production mode.
The technical scheme adopted for solving the technical problems is as follows: a method for preventing converter from sticking scrap steel in an ultra-low iron loss production mode comprises the following steps:
S1, after the open-blowing half-oxygen period of converter production is finished, controlling oxygen blowing pressure and gun position;
S2, controlling the carbon gun position and oxygen blowing pressure at the end point by the oxygen blowing end point, and controlling the gun pressing time;
S3, observing the molten steel state in the converter, judging whether an oxygen blowing end point of the molten steel is a peroxidation furnace, and adding 48-53 kg of light-burned magnesium balls to blow slag by using nitrogen before the steel is put into the peroxidation furnace;
s4, when the slag is thin after the slag splashing of the peroxidation furnace time is finished, lime is added to thicken the slag, and furnace shaking operation is carried out;
S5, detecting the temperature of molten steel in the converter, and controlling the temperature of the molten steel to be not lower than 1320 ℃ while lime and scrap steel are added;
S6, paying attention to the change condition of the converter bottom in each shift, reporting to a workshop, and adjusting the converter bottom blowing parameters according to actual conditions by the workshop to ensure bottom blowing flow.
Specifically, the oxygen blowing pressure in the step S1 is controlled to be 0.95-1.0 MPa, the oxygen blowing pressure is regulated to be 0.85-0.9 MPa, the oxygen blowing is controlled to be 3-6 min, and the gun position is controlled to be 1200-1400 mm.
Specifically, the end point carbon gun pulling position in the step S2 is 890-930 mm, the oxygen blowing pressure is controlled to be 0.95-1.0 MPa, and the oxygen gun pressing time is more than 40S.
Specifically, in the step S3, the molten steel state in the converter is a red molten steel and the surface slag has good fluidity, and is a peroxidation state.
Specifically, the lime addition amount in the step S4 is 1200-1500 Kg, the furnace is rocked forward to +129 degrees to +130 degrees, after the bottom ash is fully paved on the slag pouring surface, the converter is subjected to scrap steel adding operation, and the added lime is equivalent to a part of the first slag.
Specifically, if the temperature of the molten steel in the step S5 is lower than 1320 ℃, the furnace is rocked backwards to-25 ℃ after the scrap steel is added, and then the converter is rocked to the iron charging angle for iron charging operation.
The invention has the following beneficial effects:
The method for preventing the converter from sticking the scrap steel in the ultra-low iron loss production mode can effectively avoid sticking the scrap steel in the converter, improve the accuracy of the terminal temperature components, reduce the frequency of blowing and reduce the risks of production accidents and quality accidents.
The method for preventing the converter from sticking the scrap steel in the ultra-low iron loss production mode can improve the accuracy of the temperature component of the molten steel at the end point after avoiding sticking the scrap steel in the converter, reduce the temperature drop in the process, reduce the risk of quality accidents, ensure relatively stable molten steel quantity among the furnaces and be beneficial to stabilizing the production order.
Drawings
Fig. 1 is a system diagram of a first embodiment of production of a converter sticky steel in an ultra-low iron loss production mode.
Fig. 2 is a system diagram of a second production example of preventing converter sticking waste steel in an ultra-low iron loss production mode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described in further detail below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for preventing converter from sticking scrap steel in an ultra-low iron loss production mode comprises the following steps:
1. After the open-blowing half-oxygen period of converter production is finished, controlling oxygen blowing pressure and gun position; the oxygen blowing pressure is controlled to be 0.95-1.0 MPa, the oxygen blowing pressure is adjusted to be 0.85-0.9 MPa, the oxygen blowing pressure is controlled to be 3-6 min, and the gun position is controlled to be 1200-1400 mm.
2. Controlling the carbon gun position and oxygen blowing pressure at the end point by the oxygen blowing end point, and controlling the gun pressing time; the end point carbon gun drawing position is 890-930 mm, the oxygen blowing pressure is controlled to be 0.95-1.0 MPa, and the oxygen gun pressing time is more than 40s, so that the content of FeO in slag is reduced, the molten steel yield is improved, the slag splashing furnace protection effect is improved, and the probability of slag wrapping iron block scrap steel is reduced.
3. And observing the molten steel state in the converter to judge whether the oxygen blowing end point of the molten steel is a peroxidation state when the molten steel state in the converter is red, and the surface slag has good fluidity.
Adding 48-53 kg of light burned magnesium balls before placing steel in the peroxidation furnace, and blowing slag by using nitrogen; the effect of avoiding the slag splashing caused by peroxidation is poor.
4. When the slag is thin after the slag splashing of the peroxidation furnace is finished, adding lime to thicken the slag, wherein the lime addition amount is 1200-1500 Kg, and carrying out a furnace shaking operation forward until the slag is +129 DEG to +130 DEG, so that the bottom ash is paved on the slag pouring surface, and then carrying out a converter steel scrap adding operation, wherein the added lime is equivalent to a part of the first slag making material.
When the slag is thinner after the slag splashing of the peroxide heat is finished, the lime is added to thicken the slag, so that the slag is prevented from wrapping iron block steel scraps, and the added lime is preheated in advance, so that the slag forming time of converter head batch is shortened, and the earlier dephosphorization effect is improved.
5. Detecting the temperature of molten steel in the converter, and controlling the temperature of the molten steel to be not lower than 1320 ℃ while lime and scrap steel are added; and (5) after the scrap steel is added, shaking the converter backwards to-25 degrees, and shaking the converter to the iron charging angle for iron charging operation.
The molten iron temperature is lower, and the furnace is rocked backwards after the scrap steel is added, so that the scrap steel which is not firmly adhered in the furnace can be loosened, and the problem that the scrap steel is difficult to treat after being firmly adhered is avoided.
After avoiding the waste steel sticking in the furnace, the accuracy of the temperature components of the molten steel at the end point can be improved, the temperature drop in the process is reduced, and the risk of quality accidents is reduced. The steel water quantity among the heat is relatively stable, which is favorable for stabilizing the production order.
6. Every class pays attention to the change condition of the converter bottom and reports to a workshop, and the workshop adjusts the converter bottom blowing parameters according to actual conditions to ensure bottom blowing flow.
Embodiment one: as shown in fig. 1.
L1G1Z123L01372 times, wherein the temperature of molten iron is 1320 ℃, and the mass percentages of molten iron components are as follows: 3.92% of C, 0.34% of Si, 0.42% of Mn, 112.79 tons of molten iron and 52.54 tons of scrap steel.
After the last furnace deslagging is finished, 1313kg of lime is added into the converter, the converter is rocked forward to 129 degrees, lime is flatly paved on the deslagging surface of the converter, then rocked to 55 degrees, waste steel begins to be added, after the waste steel is added, the converter is rocked backward to-25 degrees, and then rocked forward to 58 degrees, and molten iron begins to be added. Blowing is carried out after the iron charging is finished, the oxygen blowing pressure is 0.952MPa, the blowing gun position is 2016mm, and the oxygen pressure is reduced to 0.699MPa after ignition to prevent explosion venting. After the half oxygen period is over, the oxygen pressure is increased to 0.92MPa, and the gun position is reduced to 1391mm. Adding 1947kg of coal to carry out thermal compensation in the smelting process, adding 2883kg of lime and 1486kg of light burned magnesium balls to carry out slag formation. When the blowing is carried out to 10 '59', the gun is lowered to 892mm, the oxygen pressure is 0.986MPa, the gun is lifted to stop the blowing after 72 seconds, and the furnace is reversed to measure the temperature and sample.
The non-sticky scrap steel in the furnace is good in slag fluidity in the furnace temperature measurement and sampling process of furnace pouring, the temperature measurement is 1605 ℃, and the oxidation sample comprises the following components in percentage by mass: c0.042%, mn 0.11%, P0.022%, terminal peroxidation, slag foaming, placing steel, adding 48kg of light burned magnesium balls into a furnace, purging with nitrogen, and placing steel.
Embodiment two: as shown in fig. 2.
L1G1Z123L01383 times, the molten iron temperature is 1395 ℃, and the molten iron comprises the following components in percentage by mass: 4.65% of C, 0.22% of Si, 0.34% of Mn, 107.71 tons of molten iron and 53.58 tons of scrap steel.
After the last furnace deslagging is finished, adding 1297kg of lime into the converter, shaking the converter forward to 130 degrees, spreading the lime on the deslagging surface of the converter, shaking the converter to 56 degrees, starting to add the scrap steel, and directly shaking the converter forward to 89 degrees, spreading the scrap steel on the deslagging surface, and shaking the converter to 58 degrees, thus starting to mix the molten iron. Blowing is carried out after the iron charging is finished, the oxygen blowing pressure is 0.959MPa, the blowing gun position is 2016mm, and the oxygen pressure is reduced to 0.63MPa after ignition to prevent explosion venting. After the half-oxygen period is over, the oxygen pressure is increased to 0.946MPa, and the gun position is reduced to 1351mm. 235kg of coal is added in the smelting process for thermal compensation, 2568kg of lime is added, and 1157kg of light burned magnesium balls are added for slagging. When the blowing is carried out to 10 '47', the lance is lowered to 928mm, the oxygen pressure is 0.95MPa, the lance is lifted to stop the blowing after 42 seconds, and the temperature measurement and sampling are carried out by pouring the furnace.
The non-sticky scrap steel in the furnace is good in slag fluidity in the furnace temperature measurement and sampling process of furnace pouring, the temperature measurement is 1632 ℃, and the oxidation sample comprises the following components in percentage by mass: c0.034%, mn 0.06%, P0.014%, end peroxidation, slag foaming, placing steel, adding 53kg of light burned magnesium balls into a furnace, purging with nitrogen, and placing steel.
The present invention is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present invention can fall within the scope of the present invention if the present invention has the same or similar technical solutions.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (6)
1. The method for preventing converter from sticking scrap steel in the ultra-low iron loss production mode is characterized by comprising the following steps of:
S1, after the open-blowing half-oxygen period of converter production is finished, controlling oxygen blowing pressure and gun position;
S2, controlling the carbon gun position and oxygen blowing pressure at the end point by the oxygen blowing end point, and controlling the gun pressing time;
S3, observing the molten steel state in the converter, judging whether an oxygen blowing end point of the molten steel is a peroxidation furnace, and adding 48-53 kg of light-burned magnesium balls to blow slag by using nitrogen before the steel is put into the peroxidation furnace;
s4, when the slag is thin after the slag splashing of the peroxidation furnace time is finished, lime is added to thicken the slag, and furnace shaking operation is carried out;
S5, detecting the temperature of molten steel in the converter, and controlling the temperature of the molten steel to be not lower than 1320 ℃ while lime and scrap steel are added;
S6, paying attention to the change condition of the converter bottom in each shift, reporting to a workshop, and adjusting the converter bottom blowing parameters according to actual conditions by the workshop to ensure bottom blowing flow.
2. The method for preventing steel scrap sticking in a converter in an ultra-low iron loss production mode according to claim 1, wherein the oxygen blowing pressure in the step S1 is controlled to be 0.95-1.0 MPa, the oxygen blowing pressure is controlled to be 0.85-0.9 MPa, the oxygen blowing pressure is controlled to be 3-6min, and the gun position is controlled to be 1200-1400 mm.
3. The method for preventing converter from sticking scrap steel in an ultra-low iron loss production mode according to claim 1, wherein the end point carbon gun drawing position in the step S2 is 890-930 mm, the oxygen blowing pressure is controlled to be 0.95-1.0 MPa, and the oxygen gun pressing time is more than 40S.
4. The method for preventing molten steel sticking to steel in a converter in an ultra-low iron loss production mode according to claim 1, wherein the molten steel in the converter in step S3 is a red molten steel, and the surface slag has good fluidity, and is a peroxidized state.
5. The method for preventing steel scrap sticking in a converter in an ultra-low iron loss production mode according to claim 1, wherein the lime added in the step S4 is 1200-1500 Kg, the converter is rocked forward to +129° to +130°, the bottom ash is fully poured on the slag surface, and the steel scrap adding operation of the converter is performed, wherein the added lime corresponds to a part of the first slag.
6. The method for preventing molten steel from sticking to scrap in a converter in an ultralow iron loss production mode according to claim 1, wherein the molten steel temperature in step S5 is lower than 1320 ℃, the converter is shaken to-25 ° after the scrap addition is completed, and the converter is shaken to a tapping angle for tapping operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410073279.XA CN117887924A (en) | 2024-01-18 | 2024-01-18 | Method for preventing converter from sticking scrap steel in ultra-low iron loss production mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410073279.XA CN117887924A (en) | 2024-01-18 | 2024-01-18 | Method for preventing converter from sticking scrap steel in ultra-low iron loss production mode |
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| CN117887924A true CN117887924A (en) | 2024-04-16 |
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| CN202410073279.XA Pending CN117887924A (en) | 2024-01-18 | 2024-01-18 | Method for preventing converter from sticking scrap steel in ultra-low iron loss production mode |
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