CN116555525A - Smelting method for improving bottom blowing air permeability of newly-online ladle - Google Patents
Smelting method for improving bottom blowing air permeability of newly-online ladle Download PDFInfo
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- CN116555525A CN116555525A CN202310336587.2A CN202310336587A CN116555525A CN 116555525 A CN116555525 A CN 116555525A CN 202310336587 A CN202310336587 A CN 202310336587A CN 116555525 A CN116555525 A CN 116555525A
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- 238000007664 blowing Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000003723 Smelting Methods 0.000 title claims abstract description 24
- 230000035699 permeability Effects 0.000 title claims abstract description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 192
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 97
- 239000010959 steel Substances 0.000 claims abstract description 97
- 229910052786 argon Inorganic materials 0.000 claims abstract description 96
- 238000010079 rubber tapping Methods 0.000 claims abstract description 85
- 230000008569 process Effects 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 238000009833 condensation Methods 0.000 claims abstract 2
- 230000005494 condensation Effects 0.000 claims abstract 2
- 239000011449 brick Substances 0.000 abstract description 12
- 239000007789 gas Substances 0.000 abstract description 11
- 229920002148 Gellan gum Polymers 0.000 abstract 1
- 238000009423 ventilation Methods 0.000 description 22
- 238000009749 continuous casting Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 230000001754 anti-pyretic effect Effects 0.000 description 2
- 239000002221 antipyretic Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003349 gelling agent Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a smelting method for improving bottom blowing air permeability of a new online ladle, which comprises the following steps: step one, heating the bottom of a movable steel ladle; step two, before tapping, opening a movable steel ladle to blow argon gas; moving a ladle to perform bottom argon blowing in the whole tapping process, wherein the temperature is not less than 1635 ℃ during tapping of the converter, and only 0.4-0.5Kg/t of metal aluminum is added during tapping, and the metal aluminum is used as a deoxidizing and heating agent; step three, regulating the argon flow to 300-500L/min after tapping to perform strong argon blowing for 2-3min, stirring by the strong argon blowing to avoid cold steel condensation at the bottom of the ladle, and after stirring, soft argon blowing for 30-60s, closing argon and connecting a movable ladle with a movable small steam drum; transferring the mobile ladle to the LF, and maintaining the bottom blowing argon of the mobile ladle through the mobile small steam drum in the process of transferring the mobile ladle to the LF; step four, after the moving ladle enters the LF, a ladle argon source is connected, strong stirring is carried out to avoid condensing cold steel at the bottom of the ladle, and then normal refining is carried out; the invention has the advantages of high air permeability in molten steel refining, reduced amount of gellan steel and anti-blocking air brick.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a smelting method for improving bottom blowing air permeability of a new online ladle.
Background
The ladle is a main device of a steel mill, and is mainly used for containing molten steel, a shell is made of steel plates, and refractory materials are built in the shell. The ladle bottom is designed with air bricks, and after the ladle bottom is connected with an air source, the ladle has an air blowing function. The conventional smelting process comprises the following steps of performing bottom argon blowing at a uniform temperature on converter tapping-ladle containing molten steel-ladle, feeding the component-ladle into an LF furnace, performing bottom argon blowing, and finishing refining-ladle upper continuous casting pouring, wherein the ladle has good argon blowing, temperature adjusting and refining functions, and the ladle bottom argon blowing runs through key processes from tapping to refining finishing and the like, so that the ladle bottom argon blowing is a very important smelting and refining tool for a steel mill. However, when a converter-LF-continuous casting process flow is adopted, when a new moving ladle is put into use, the ventilation of the bottom blowing of the converter is normal, but after the converter is closed, when the bottom blowing gas is opened again by hanging the moving ladle into the LF, the bottom blowing is not ventilated (namely, ventilation blocking) and if the bottom blowing of the ladle is not ventilated, the molten steel needs to be poured (namely, another ladle is poured) or returned to be treated, so that continuous pouring is interrupted, and the influence on steelmaking production is large.
In the prior art, regarding how to improve the problem that the new online ladle bottom blowing has no ventilation and lacks a scheme with stronger operability in the converter-LF-continuous casting process, in order to solve the problem that the mobile ladle in the converter-LF-continuous casting process has no ventilation or low ventilation rate in the LF bottom blowing, a new technical scheme needs to be developed.
Disclosure of Invention
The invention aims at solving the problems existing in the prior art and provides a smelting method for improving the bottom blowing air permeability of a new online ladle.
In order to achieve the above purpose, the invention adopts the following technical scheme: a smelting method for improving bottom blowing air permeability of a new online ladle comprises the following steps:
step one, heating the bottom of a movable ladle to a temperature of more than or equal to 800 ℃, wherein the interval time from the end of heating the movable ladle to tapping is less than or equal to 15min, and the interval time from the cover uncovering time of the movable ladle to tapping is less than or equal to 7min;
step two, before tapping, opening a movable steel ladle to blow argon, wherein the flow is 100-200L/min; moving a ladle to perform bottom argon blowing in the whole tapping process, wherein the temperature is not less than 1635 ℃ during tapping of the converter, and only 0.4-0.5Kg/t of metal aluminum is added during tapping, and the metal aluminum is used as a deoxidizing and heating agent;
step three, argon flow is adjusted to 300-500L/min after tapping is completed, strong argon blowing is carried out for 2-3min, stirring is carried out through the strong argon blowing to avoid condensing cold steel at the ladle bottom, argon is adjusted to 80-150L/min after stirring, argon is closed after soft blowing is carried out for 30-60s, and a movable ladle is connected with a movable small steam ladle; transferring the mobile ladle to the LF, and maintaining the bottom blowing argon of the mobile ladle through a small mobile steam drum in the process of transferring the mobile ladle to the LF, wherein the argon flow is 50-80L/min;
and fourthly, after the moving ladle is put into the LF, a ladle argon source is connected, argon is strongly blown for 1-2min at the argon flow rate of 400-500L/min, cold steel is prevented from being condensed at the bottom of the ladle by strong stirring, and then the argon flow rate is adjusted to be in a normal state and refining treatment is carried out.
In the scheme, firstly, when the bottom of the mobile ladle is contacted with molten steel, the temperature difference between the molten steel and the mobile ladle bottom is large, and the ladle bottom is easy to cool the steel, so that before tapping begins, the mobile ladle is heated at the bottom, the cooling steel can be effectively avoided when the temperature reaches more than 800 ℃, and meanwhile, the antipyretic end time, the ladle cover uncovering time and the interval time of tapping are strictly controlled, so that the temperature of the bottom of the mobile ladle before tapping is prevented from being greatly reduced; in the second step, argon is blown before tapping, so that air holes of an air brick are prevented from being blocked, the tapping temperature is controlled, the temperature is prevented from being too low when molten steel contacts with a movable ladle, alloys such as silicon-manganese and the like are not added in tapping to reduce the tapping temperature drop, and only metal aluminum is added in tapping to serve as a deoxidizing and heating agent to maintain the temperature of the molten steel; the mode that the moving ladle finishes the alloying of the silicon and the manganese in the working procedure after LF, and the loading sequence adopts the operation of firstly adding iron and then adding scrap steel; in the third step, the molten steel in the movable ladle is subjected to strong argon blowing stirring after tapping, so that cold steel at the bottom of the ladle is avoided, a converter argon source of the movable ladle is turned into a movable small steam drum after argon is closed, argon is provided for bottom blowing in the transferring process of the movable ladle through the movable small steam drum, the ventilation purpose is mainly to prevent the molten steel from reversely penetrating into the air brick, the cold steel is prevented from being condensed at the air brick at the bottom of the ladle, and the state of a bottom blowing passage is maintained; and fourthly, immediately switching on an argon source of the ladle at the LF furnace after the moving ladle enters the LF, forcibly blowing argon for 1-2min, and forcibly stirring to avoid condensing cold steel at the bottom of the ladle, so that the operation of feeding the ladle into the furnace is finished, and meanwhile, the ventilation rate during bottom blowing is ensured, and normal refining treatment can be performed.
According to research, a long-flow process, namely a converter-LF-continuous casting process, is characterized in that the bottom blowing of a new online ladle is free from ventilation when the ladle is put into LF, the main reason is that the temperature difference between the bottom of the ladle and molten steel is large, the steel is easy to cool at the bottom of the ladle, the thicker the thickness of the steel is, the lower the bottom blowing ventilation is, the ventilation is difficult to be realized, the lower the steel tapping temperature is, the higher the steel tapping temperature is, the longer the time interval from the closing of argon gas to the LF of the converter is, and the lower the ventilation is easily caused.
Further, the tapping time of the converter is less than or equal to 3min, and the temperature drop of molten steel in the tapping process is less than or equal to 30 ℃.
By controlling tapping time, the temperature drop of molten steel is ensured not to exceed the range, and cold junction caused by too low temperature of molten steel in a ladle is avoided.
Further, in the third step, the movable small steam pocket is detachably arranged on the movable steel ladle, and the movable small steam pocket and the movable steel ladle are transported synchronously.
Through with remove little steam pocket detachable and install on removing the steel ladle, the convenience is transported along with removing the ladle and guarantee the argon gas air feed of process.
Further, the time from the tapping to the argon blowing of the converter is controlled to be less than or equal to 8 minutes.
The steel ladle is controlled in the treatment time of the converter argon station, in order to reduce the temperature drop in the tapping process, the time from the tapping to the argon blowing is required to be controlled to be less than or equal to 8 minutes, the steel ladle is transferred to an LF furnace as soon as possible, the LF has a temperature rising function, and the LF can immediately carry out temperature compensation.
Further, in the first step, the moving ladle is heated in a ladle bottom baking mode.
Convenient operation and good heating effect.
Further, in the first step, the ladle cover is opened after the ladle cover opening time of the moving ladle starts converting for at least 8 minutes in the smelting furnace time.
Ensure enough converter converting time and avoid the cooling of the ladle or insufficient converting caused by premature uncovering of the ladle cover.
In the third step, argon is regulated to 80-150L/min after stirring, and soft blowing is carried out for 30-60s.
The nonmetallic inclusion in the molten steel is removed by soft blowing, the cleanliness of the molten steel is improved, and the molten steel reverse osmosis gas brick is avoided.
Further, the movable ladle and the movable small steam drum are transported synchronously in a hoisting mode.
The transportation is convenient in a hoisting mode.
Further, in the third step, when the small movable steam drum is connected, the movable ladle is covered.
The cooling speed of molten steel is reduced by adding a ladle cover to the movable ladle.
Further, the cover is provided with ventilation holes.
And the ventilation holes are arranged for gas to flow out, so that the pressure balance between the inside and the outside of the steel ladle is maintained.
Compared with the prior art, the invention has the beneficial effects that:
1. through the smelting design from the tapping of the converter to the process of entering the LF, the key process designs of reasonable design of tapping temperature standard, shortening of tapping time, reduction of tapping temperature drop by alloying only adding aluminum, shortening of calming time after tapping of molten steel, maintenance of ladle bottom blowing before tapping and during tapping, addition of a steam drum and ventilation of air brick reverse osmosis molten steel in the molten steel transferring process, staged bottom blowing argon flow control and the like are adopted, so that the air brick passage is prevented from being blocked by molten steel, and the bottom blowing air permeability of a transferred steel refining ladle is effectively improved;
2. by controlling the heating and uncovering time of the movable ladle and the tapping temperature and transferring time of the converter and by adjusting the alloy process sequence and preserving the molten steel temperature in the transferring process, ladle bottom gellant steel caused by temperature difference between molten steel and ladle and insufficient molten steel temperature is avoided, the quantity of the gellant steel is reduced, and the smooth refining of the molten steel is facilitated;
3. the method has the advantages of simple and clear process flow, strong operability and easy control.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention. In the description of the present invention, it should be noted that, the terms front, rear, left, right, and the like indicate an orientation or a positional relationship in which the inventive product is conventionally disposed in use, and are merely for convenience of describing the present invention or simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed or operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
A smelting method for improving bottom blowing air permeability of a new online ladle comprises the following steps:
step one, heating the bottom of a movable ladle to a temperature of more than or equal to 800 ℃, wherein the interval time from the end of heating the movable ladle to tapping is less than or equal to 15min, and the interval time from the cover uncovering time of the movable ladle to tapping is less than or equal to 7min;
step two, before tapping, opening a movable steel ladle to blow argon, wherein the flow is 100-200L/min; moving a ladle to perform bottom argon blowing in the whole tapping process, wherein the temperature is not less than 1635 ℃ during tapping of the converter, and only 0.4-0.5Kg/t of metal aluminum is added during tapping, and the metal aluminum is used as a deoxidizing and heating agent;
step three, argon flow is adjusted to 300-500L/min after tapping is completed, strong argon blowing is carried out for 2-3min, stirring is carried out through the strong argon blowing to avoid condensing cold steel at the ladle bottom, argon is adjusted to 80-150L/min after stirring, argon is closed after soft blowing is carried out for 30-60s, and a movable ladle is connected with a movable small steam ladle; transferring the mobile ladle to the LF, and maintaining the bottom blowing argon of the mobile ladle through a small mobile steam drum in the process of transferring the mobile ladle to the LF, wherein the argon flow is 50-80L/min;
and fourthly, after the moving ladle is put into the LF, a ladle argon source is connected, argon is strongly blown for 1-2min at the argon flow rate of 400-500L/min, cold steel is prevented from being condensed at the bottom of the ladle by strong stirring, and then the argon flow rate is adjusted to be in a normal state and refining treatment is carried out.
In the scheme, when the mobile ladle is just put on line for use, the internal temperature is low, the bottom blowing of the mobile ladle has no ventilation, and mainly, when the bottom of the mobile ladle contacts molten steel, the temperature difference between the molten steel and the mobile ladle bottom is large, and the bottom of the ladle is easy to cool steel, so that before tapping, the mobile ladle is firstly subjected to bottom heating, the temperature reaches more than 800 ℃, the cooling steel can be effectively avoided, and meanwhile, the antipyretic end time, the ladle cover uncovering time and the tapping interval time are strictly controlled, so that the temperature of the bottom of the mobile ladle is prevented from being greatly reduced before tapping, and the bottom temperature, the heating end time and the ladle cover uncovering time of the mobile ladle are limited; the ladle baking is finished when the smelting furnace starts converting, so that the heating effect of the ladle is ensured, and the ladle baking is adapted to the ladle converting step; in the second step, argon is blown before tapping, so that air holes of an air brick are prevented from being blocked, the tapping temperature is controlled, the temperature is prevented from being too low when molten steel contacts with a movable ladle, alloys such as silicon-manganese and the like are not added in tapping to reduce the tapping temperature drop, and only metal aluminum is added in tapping to serve as a deoxidizing and heating agent to maintain the temperature of the molten steel; the mode that the moving ladle finishes the alloying of the silicon and the manganese in the working procedure after LF, and the loading sequence adopts the operation of firstly adding iron and then adding scrap steel; in the third step, the molten steel in the movable ladle is subjected to strong argon blowing stirring after tapping, so that cold steel at the bottom of the ladle is avoided, a converter argon source of the movable ladle is turned into a movable small steam drum after argon is closed, argon is provided for bottom blowing in the transferring process of the movable ladle through the movable small steam drum, the ventilation purpose is mainly to prevent the molten steel from reversely penetrating into the air brick, the cold steel is prevented from being condensed at the air brick at the bottom of the ladle, and the state of a bottom blowing passage is maintained; and fourthly, immediately switching on an argon source of the ladle at the LF furnace after the moving ladle enters the LF, forcibly blowing argon for 1-2min, and forcibly stirring to avoid condensing cold steel at the bottom of the ladle, so that the operation of feeding the ladle into the furnace is finished, and meanwhile, the ventilation rate during bottom blowing is ensured, and normal refining treatment can be performed.
According to research, the long-process technology (namely a converter-LF-continuous casting process) is researched that bottom blowing does not have ventilation when a moving ladle enters the LF, and the main reasons are that the temperature difference between the bottom of the moving ladle and molten steel is larger, steel is easy to be cooled at the bottom of the ladle, and the ventilation is difficult to be realized when the thickness of the steel is thicker along with the thickness of the steel at the bottom of the ladle, through steel receiving process analysis of the ladle, the lower the tapping temperature is, the higher the tapping temperature is, the longer the time interval from closing argon to LF of the converter is, the more ventilation is easy to be caused, so that the scheme is correspondingly improved.
Further, the tapping time of the converter is less than or equal to 3min, and the temperature drop of molten steel in the tapping process is less than or equal to 30 ℃.
By controlling tapping time, the temperature drop of molten steel is ensured not to exceed the range, and cold junction caused by too low temperature of molten steel in a ladle is avoided.
Further, in the third step, the movable small steam pocket is detachably arranged on the movable steel ladle, and the movable small steam pocket and the movable steel ladle are transported synchronously.
Through with remove little steam pocket detachable and install on removing the steel ladle, the convenience is transported along with removing the ladle and guarantee the argon gas air feed of process.
And the movable ladle and the movable small steam drum are respectively provided with a mounting bracket, and the corresponding brackets are fixedly connected through bolts.
Further, the time from the tapping to the argon blowing of the converter is controlled to be less than or equal to 8 minutes.
The steel ladle is controlled in the treatment time of the converter argon station, in order to reduce the temperature drop in the tapping process, the time from the tapping to the argon blowing is required to be controlled to be less than or equal to 8 minutes, the steel ladle is transferred to an LF furnace as soon as possible, the LF has a temperature rising function, and the LF can immediately carry out temperature compensation.
Further, in the first step, the moving ladle is heated in a ladle bottom baking mode.
Convenient operation and good heating effect.
After the movable ladle is manufactured, the movable ladle is baked by gas until the temperature of the lining of the ladle reaches the baking temperature standard, and then the movable ladle is allowed to be used on line.
Further, in the first step, the ladle cover is opened after the ladle cover opening time of the moving ladle starts converting for at least 8 minutes in the smelting furnace time.
Ensure enough converter converting time and avoid the cooling of the ladle or insufficient converting caused by premature uncovering of the ladle cover.
In the third step, argon is regulated to 80-150L/min after stirring, and soft blowing is carried out for 30-60s.
The nonmetallic inclusion in the molten steel is removed by soft blowing, the cleanliness of the molten steel is improved, and the molten steel reverse osmosis gas brick is avoided.
Further, the movable ladle and the movable small steam drum are transported synchronously in a hoisting mode.
The transportation is convenient in a hoisting mode.
And lifting by using a crown block.
In the embodiment, 1) the temperature of the bottom of the moving ladle, the baking finish time and the time limit of the uncovering of the moving ladle. The baking temperature of the bottom of the movable ladle is 850 ℃, the baking of the ladle is finished when the smelting furnace starts converting, the baking is finished until the steel tapping interval is 15min, the ladle cover is uncovered when the smelting furnace starts converting for 8min, and the steel tapping interval is 7min.
2) Tapping temperature and alloying requirements of the converter. The tapping temperature is 1635 ℃, and 0.4Kg/t of metal aluminum is only added during tapping; tapping through a tapping hole with a large inner diameter for 3min. The temperature in the tapping process is reduced to 30 ℃ and the temperature after tapping is 1605 ℃.
3) Argon blowing requirements at the bottom of the bag: argon is blown before tapping, the flow is 150L/min, argon is blown at the bottom in the whole tapping process, and the flow of the argon is adjusted to 400L/min after tapping, and the argon is blown at the high pressure for 2min. And after strong stirring, the argon flow is adjusted to 80L/min, and argon is closed after soft blowing for 30 seconds.
4) The ladle is treated in the converter argon station for a period of time. The time from tapping to argon blowing of the converter is 8min.
5) And in the process of transferring the ladle to the LF, a small gas ladle is adopted to maintain argon bottom blowing of the ladle, and the argon flow is 50L/min.
6) And immediately switching on an argon source of the ladle after the ladle is put into the LF, and strongly blowing argon for 1min at the argon flow of 400L/min.
Table of comparison of technical contents of prior art and examples:
as can be seen from the table, the air permeability of the new online steel ladle entering the LF in the comparative example is 60-75%, the argon blowing flow in the conventional mode in the industry is unlimited, the air permeability of the bottom blowing is only 50-65% as close as that of the comparative example, and the air permeability of the new online steel ladle entering the LF in the embodiment of the invention is more than or equal to 90%, so that the air permeability is effectively improved.
Example 2
Further, in the third step, when the small movable steam drum is connected, the movable ladle is covered.
The cooling speed of molten steel is reduced by adding a ladle cover to the movable ladle.
Further, the cover is provided with ventilation holes.
And the ventilation holes are arranged for gas to flow out, so that the pressure balance between the inside and the outside of the steel ladle is maintained.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A smelting method for improving bottom blowing air permeability of a new online ladle is characterized by comprising the following steps:
step one, heating the bottom of a movable ladle to a temperature of more than or equal to 800 ℃, wherein the interval time from the end of heating the movable ladle to tapping is less than or equal to 15min, and the interval time from the cover uncovering time of the movable ladle to tapping is less than or equal to 7min;
step two, before tapping, opening a movable steel ladle to blow argon, wherein the flow is 100-200L/min; moving a ladle to perform bottom argon blowing in the whole tapping process, wherein the temperature is not less than 1635 ℃ during tapping of the converter, and only 0.4-0.5Kg/t of metal aluminum is added during tapping, and the metal aluminum is used as a deoxidizing and heating agent;
step three, adjusting the argon flow to 300-500L/min after tapping, and carrying out strong argon blowing for 2-3min, stirring by the strong argon blowing to avoid condensation of cold steel at the bottom of the ladle, closing argon after stirring, and connecting a movable ladle with a movable small steam drum; transferring the mobile ladle to the LF, and maintaining the bottom blowing argon of the mobile ladle through a small mobile steam drum in the process of transferring the mobile ladle to the LF, wherein the argon flow is 50-80L/min;
and fourthly, after the moving ladle is put into the LF, a ladle argon source is connected, argon is strongly blown for 1-2min at the argon flow rate of 400-500L/min, cold steel is prevented from being condensed at the bottom of the ladle by strong stirring, and then the argon flow rate is adjusted to be in a normal state and refining treatment is carried out.
2. The smelting method for improving the bottom blowing air permeability of the newly-introduced ladle according to claim 1, wherein the tapping time of the converter is less than or equal to 3min, and the temperature drop of molten steel in the tapping process is less than or equal to 30 ℃.
3. The smelting method for improving bottom blowing air permeability of a new online ladle according to claim 1, wherein in the third step, the movable small steam drum is detachably arranged on the movable ladle, and the movable small steam drum and the movable ladle are transported synchronously.
4. The smelting method for improving the bottom blowing air permeability of the newly-introduced ladle according to claim 1, wherein the time from the start of tapping to the end of blowing argon in the converter is controlled to be less than or equal to 8 minutes.
5. The method for improving bottom blowing air permeability of newly introduced ladle as recited in claim 1, wherein in step one, the moving ladle is heated by baking the ladle bottom.
6. The smelting method for improving bottom blowing air permeability of a newly introduced ladle according to claim 1, wherein in the first step, the ladle cover is removed after the smelting furnace starts converting for at least 8 minutes.
7. The smelting method for improving the bottom blowing air permeability of the newly-introduced steel ladle according to claim 1, wherein argon is regulated to 80-150L/min after stirring, and soft blowing is performed for 30-60s.
8. A smelting method for improving bottom blowing air permeability of a newly-introduced ladle according to claim 3, wherein the movable ladle and the movable small drum are transported synchronously by hoisting.
9. The method for improving bottom blowing air permeability of newly-introduced ladle as recited in claim 1, wherein in step three, the moving ladle is covered when the moving small steam drum is connected.
10. The smelting method for improving the bottom blowing air permeability of the newly-introduced ladle as recited in claim 9, wherein the ladle cover is provided with air holes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310336587.2A CN116555525A (en) | 2023-03-31 | 2023-03-31 | Smelting method for improving bottom blowing air permeability of newly-online ladle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310336587.2A CN116555525A (en) | 2023-03-31 | 2023-03-31 | Smelting method for improving bottom blowing air permeability of newly-online ladle |
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