CN116179794A - Technological method for continuously recycling hot casting residue into LF ladle furnace - Google Patents
Technological method for continuously recycling hot casting residue into LF ladle furnace Download PDFInfo
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- CN116179794A CN116179794A CN202310283644.5A CN202310283644A CN116179794A CN 116179794 A CN116179794 A CN 116179794A CN 202310283644 A CN202310283644 A CN 202310283644A CN 116179794 A CN116179794 A CN 116179794A
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- 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
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- 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
- C21C7/0006—Adding metallic additives
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- 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- 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
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- 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
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a process method for continuously recycling hot casting residues in an LF ladle furnace, which comprises the following steps: s1, carrying out pre-deoxidation treatment on molten steel; s2, receiving hot casting residues in a refining-continuous casting span of the pre-deoxidized molten steel: s21, pouring casting residues of the steel ladle with the unreutilized overheated casting residues directly into the surface of molten steel; pouring out part of casting residue before recycling the recycled steel ladle with the hot casting residue, and directly pouring the rest steel slag into the surface of molten steel; s22, after receiving the casting residue, conveying the ladle to an LF ladle furnace treatment station, heating molten steel to perform slag formation, and adding 0.85-1.75 kg/t lime to further adjust slag when the temperature is increased to be above 1575 ℃. The invention solves the problems of large slag quantity, difficult slag adjustment, unstable desulfurization efficiency and the like in the existing hot casting slag recycling process, improves the recycling times of hot casting slag and reduces the cost.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a process method for continuously recycling hot casting residues in an LF ladle furnace.
Background
The casting residue produced by the molten steel subjected to LF refining treatment is high-alkalinity reducing slag, and due to CaO and Al 2 O 3 High content, low w (MnO+FeO), strong premelting and high sulfur capacity, therefore, in the recycling process, the rapid slagging and slagging in the early stage of the LF furnace can be promoted, and meanwhile, the desulfurization function is good; in addition, the hot casting residues have higher physical heat; therefore, many iron and steel enterprises perform thermal recycling on casting residues. The recycling of the hot casting residues not only reduces the consumption of slag forming materials, but also improves the yield of metals.
In actual production, the first recycled hot casting residue has higher sulfur capacity, good slag melting effect and desulfurization effect, and the alkalinity of hot slag is reduced along with the increase of the recycling times, and Al in the slag 2 O 3 The Mannesmann index of the slag is reduced, and the sulfur content in the slag is circularly accumulated, so that the sulfur capacity of the circulated slag is reduced, the LF refining desulfurization efficiency is reduced, and the desulfurization is unstable; meanwhile, along with the change of slag components in the recycling process of casting residues, the adsorption inclusion capacity of refining slag is also reduced, the cleanliness of molten steel is influenced, and the incidence rate of inclusion defects on the surface of a finished product is increased; in addition, as the recovery times increase, the ladle slag amount increases,Slag overflow is easy to cause due to the lower clearance at the upper part of molten steel, and the production safety and the smooth operation are influenced. The number of times and the applicable steel grade of the hot slag recycling in the refining process are limited by the problems.
Therefore, how to control the slag quantity in the recycling process of the casting residues and ensure that the recycled casting residues have higher sulfur capacity is a key technical problem to be solved in the continuous recycling LF refining process of the hot casting residues.
In order to solve the problem that the recycling times are limited due to the large slag quantity and unstable desulfurization efficiency of the hot casting residue in the recycling process, various manufacturers have also studied a lot:
the invention patent with publication number of CN 106811576B discloses a converter slag thermal state recycling method, wherein the converter tapping process does not control the slag discharging amount, and slag reducing agent is continuously added into the slag surface in the ladle in the process of tilting and inverting the slag in the ladle; the chemical reaction of the slag reducing agent and phosphorus, silicon, manganese and iron oxides in the slag is realized by utilizing a high-temperature zone formed by LF electrode heating, and simultaneously bottom blowing stirring is carried out, wherein the gas flow is 0.04-0.12Nm3/h.t, and the stirring time is 5-20min; after the slag is fully reduced, carrying out alloying treatment on the molten steel according to the influence of the slag on the phosphorus, silicon and manganese components of the molten steel and the steel grade requirement; pouring hot casting residue into the surface of the slag-removed molten iron after pouring, and adding the hot casting residue into a converter together with the molten iron. The invention not only saves the alloy consumption and the steel consumption in the molten steel alloying process, but also saves the slag consumption in the reduction refining process, thereby realizing the thermal recycling of converter slag.
The invention patent with publication number of CN202010239300.0 discloses an energy-saving and emission-reducing method for recycling hot casting residues, and a set of feasible hot casting residue recycling method is prepared by comprehensively carding and summarizing feasibility analysis, flow design, recovery procedure point and cheating analysis, process standard formulation, process operation formulation, effect analysis after recovery and the like of hot casting residues. After the casting residue is recycled, the molten steel receiving rate is improved, the auxiliary material consumption is reduced, the rapid slag formation of refining is promoted, the refining treatment time is shortened, and the refining efficiency is improved.
The invention patent with publication number of CN201210500164.1 discloses a method for hot application of steelmaking low-alkalinity casting residues. The method adopts the ladle low alkalinity casting residue 5-7kg/t steel thermal state to be added into the converter along with the semisteel, fully utilizes the heat of the molten casting residue, can rapidly form slag after converting for 2min, avoids the addition of a composite slag former and a heating agent in the conventional semisteel smelting process, and reduces the production cost. The slag making system is matched to realize the rapid production of high-alkalinity slag under the low temperature condition, and the phosphorus content in the molten iron is rapidly and efficiently removed from 0.35 to 0.80 percent in the normal smelting period, so as to finally reach the target requirement of steel grade. The full recycling of casting residues is basically realized in steelmaking, the environmental pressure and the treatment cost of waste residue discharge are reduced, and the environmental protection benefit is obvious.
The invention patent with publication number of CN201811557461.3 discloses a method for recycling ladle hot casting residues by a converter, which solves the problem that the casting residues and the self waste heat thereof cannot be effectively utilized in the prior art. The method of the invention comprises the following steps: returning hot casting residues remained in the steel ladle after the molten steel casting to a converter steelmaking process for recycling; carrying out slag skimming operation after carrying out desulfurization pretreatment on molten iron in a molten iron tank; the ladle is transported to a molten steel receiving span after the furnace, a ladle filled with hot casting residues is transported to a feed inlet of the ladle and poured into the surface of molten iron, and then the ladle is transported back to the molten steel receiving span, and the molten iron is added into a converter for converter smelting. The method disclosed by the invention is energy-saving, environment-friendly, effectively and stably utilizes the casting residues of liquid continuous casting to realize the thermal state recycling of the casting residues, can reduce the consumption of steel materials, effectively utilizes the sensible heat of slag, improves the smelting efficiency, reduces the production cost of steelmaking, and improves the quality of molten steel, and the environmental protection benefit is obvious.
The above-mentioned inventions are mainly characterized by that the hot casting residue can be reused in converter, ladle or several procedures. The LF refining process for recycling the hot casting residues has high molten steel yield and heat efficiency and simple process, but the recycling process is influenced by factors such as steel grade, slag quantity, desulfurization and the like, and the recycling times are limited. In order to improve the sulfur capacity of the casting residue, lime is added to adjust the residue during the second and third recycling of the casting residue, but in the actual residue adjustment process, the amount of the recycled casting residue is increased, so that the difficulty in controlling the addition amount of lime for adjusting the residue is high, the purpose of adjusting the residue cannot be realized due to the small addition amount, and the addition amount is too much, so that the cost is increased, the slag amount is increased, and the subsequent recycling is influenced; in addition, due to the influence of the oxidizing property of the initial slag, the aluminum consumption of deoxidization and slagging is increased due to the increase of the slag quantity after the casting residue is recycled. Because of the problems in production, the current hot casting residue recycling heat is generally not more than three furnaces.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a process method for continuously recycling hot casting residues into an LF ladle furnace. The invention solves the problems of large slag quantity, difficult slag adjustment, unstable desulfurization efficiency and the like in the existing hot casting slag recycling process, improves the recycling times of hot casting slag and reduces the cost.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a process method for continuously recycling hot casting residues in an LF ladle furnace comprises the following steps:
s1, carrying out pre-deoxidation treatment on molten steel;
s2, receiving hot casting residues in a refining-continuous casting span of the pre-deoxidized molten steel:
s21, pouring casting residues of the steel ladle with the unreutilized overheated casting residues directly into the surface of molten steel; pouring out part of casting residue before recycling the recycled steel ladle with the hot casting residue, and directly pouring the rest steel slag into the surface of molten steel;
s22, after receiving the casting residue, conveying the ladle to an LF ladle furnace treatment station, heating molten steel to perform slag formation, and adding 0.85-1.75 kg/t lime to further adjust slag when the temperature is increased to be above 1575 ℃.
Preferably, in step S21, for the ladle from which the superheated state casting slag has been recycled, the pouring amount control method of the casting slag is as follows: and the slag flowing out after the opening of the big ladle is tipped over by 90 degrees for 8-10 s.
Preferably, in step S22, lime is added in an amount of 0.85 to 1.75% of steel.
Preferably, in step S1, the pre-deoxidizing treatment process for molten steel is as follows:
s11, tapping the converter to perform slag pre-adjustment: adding aluminum alloy for deoxidization after tapping 1/3; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the intense stirring effect of the high-temperature molten steel in the tapping process; after lime is added, stirring the bottom of the ladle by adopting large argon, and continuing to blow argon for stirring after tapping is finished;
s12, after the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, and argon blowing stirring is carried out at the bottom of the ladle.
Further, in step S11, the addition amount of the aluminum alloy is 1 to 2 per mill of steel.
Further, in step S11, the addition amount of lime is 2-4 per mill of steel.
Further, in step S11, the argon blowing flow rate of the large argon stirring is 800-1200L/min.
Further, in the step S11, after tapping is finished, argon blowing stirring is continued for more than or equal to 3min.
Further, in the step S12, the addition amount of aluminum iron is 0.5 to 1 per mill of steel.
Further, in the step S12, argon is blown into the bottom of the ladle and stirred for 5-8 min, and the argon blowing flow is 500-700L/min.
Compared with the prior art, the invention has the following advantages:
the continuous recycling process technology of the hot casting residue solves the problems of reduced desulfurization efficiency caused by reduced sulfur capacity, difficult slag adjustment caused by increased slag quantity, limited recycling times and the like of continuous recycling of the hot casting residue, and the casting residue can be stably recycled by more than 5 furnaces, thereby not only meeting the demands of smooth production and molten steel quality, but also obviously reducing the production cost.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, preferred embodiments of the present invention will be described below with reference to specific examples, but should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are obtained from conventional commercial sources or prepared in conventional manner.
In order to solve the problems of large slag quantity, difficult slag adjustment, unstable desulfurization efficiency and the like in the existing hot casting residue recycling process, the invention adopts the following technical scheme: adding a proper amount of slag charge in the tapping process to perform primary slag mixing, and deoxidizing the slag in an argon station to ensure that the oxidizing property of top slag is kept at a lower level and relatively stable before the casting residue is reused; in order to ensure the relative stability of LF refining slag quantity in the continuous recycling process and the stability of slag adjustment process, part of casting slag is poured out before casting slag is recycled, so that the recycling slag quantity is reduced.
The main technical characteristics and technical parameters are as follows:
(1) In order to reduce the influence of the oxidizing property of the initial slag on slag adjustment after the reuse of casting slag, a proper amount of slag charge is added in the tapping process to adjust the slag, and the slag is deoxidized in an argon station, the main process method is as follows:
1) Tapping steel from a converter to perform slag pre-adjustment: 1/3 of steel is tapped, then aluminum alloy is added for deoxidization, and the addition amount is 1-2 kg/t of steel; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the violent stirring effect of the high-temperature molten steel in the tapping process, and the addition amount of the lime is 2-4 kg/t of steel; after lime is added, stirring the bottom of the steel ladle by adopting large argon, wherein the argon blowing flow is 800-1200L/min, and continuing to blow argon and stir for more than or equal to 3min after tapping is finished;
2) After the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, the addition amount of the aluminum iron is 0.5-1.0 kg/t steel, and simultaneously argon blowing stirring is carried out on the bottom of the ladle for 5-8 min, and the argon blowing flow is 500-700L/min.
The TFe in the top slag is less than or equal to 2 percent before the casting residue is recycled, and the method has the following advantages:
can promote the early desulfurization: as the hot casting residue is the reducing residue, the oxidizing property is low (TFe is less than or equal to 2 percent), and the oxidizing property of top residue is still low and basically kept stable after the casting residue is recycled, thereby promoting the early-stage rapid desulfurization;
can save aluminum consumption: the oxidizing property of top slag is low after the casting residue is recycled, aluminum iron can be not added or only a small amount of aluminum is needed to deoxidize the slag, and the aluminum consumption is low; if the oxidizing property of top slag is high or unstable before the recycling of casting residue, the oxidizing property of top slag is also high or unstable after the recycling of casting residue, and aluminum iron needs to be added to the slag surface for slag deoxidation after the recycling, the deoxidization aluminum consumption is increased due to the large slag quantity.
(2) In order to avoid the influence of slag quantity increase on recovery and sulfur capacity reduction on desulfurization effect caused by continuous recycling of casting residues, pouring out part of slag before recycling of the casting residues to ensure the relatively stable slag quantity in the refining process, and adjusting the slag after recycling of the casting residues; the main process method is as follows:
1) The molten steel subjected to the pre-deoxidization slag formation receives hot casting residues in a refining-continuous casting span: pouring the casting residue of the ladle without recycling the casting residue directly into the surface of molten steel; the ladle for recycling the casting residues is used for pouring out part of the casting residues and then directly pouring the residual steel slag into the surface of molten steel;
2) Pouring out one half of casting residue into a slag pot before recycling the recycled hot casting residue, so as to avoid the great increase of the amount of the recycled furnace residue; the slag pouring quantity is controlled according to slag flowing time after the ladle opening is tilted by 90 degrees, namely slag flowing is 8-10 s after the ladle opening is tilted by 90 degrees.
3) After the casting residue is recovered, the molten steel is heated to be slag-formed, and when the temperature is raised to be above 1575 ℃, 0.85-1.75 kg/t lime is added for further slag mixing.
Based on the process method, the invention applies the method to a 150t ladle furnace.
Example 1
Recycling casting residue for the first time, and the recycling step comprises the following steps:
(1) Receiving the casting residue heat, wherein the end point temperature of the converter is 1645 ℃, the end point [ O ] is 630ppm, adding aluminum alloy for deoxidization after tapping 1/3 of tapping steel from the converter, and the adding amount is 1.0kg/t steel; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the violent stirring effect of the high-temperature molten steel in the tapping process, and the lime addition amount is 2.0kg/t of steel; after lime is added, stirring the bottom of the steel ladle by adopting large argon, wherein the argon blowing flow is 800L/min, and continuing to blow argon and stir for 3min after tapping is finished;
(2) After the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, the addition amount of the aluminum iron is 0.5kg/t steel, and meanwhile, argon blowing and stirring are carried out on the bottom of the ladle for 5min, and the argon blowing flow is 600L/min;
(3) Transferring molten steel to an LF furnace, and receiving hot casting residues of a casting end heat in a refining-continuous casting span;
(4) Recording and feeding back unreutilized casting residues after the casting is finished; pouring the casting residue of the casting completion heat directly and completely into the surface of the heat molten steel for receiving the casting residue by driving;
(5) After receiving casting residues, conveying the steel ladle to an LF processing station, heating molten steel to perform slag formation, heating to 1575 ℃, and adding 0.85kg/t lime to further adjust slag;
(6) And carrying out desulfurization and alloying according to the steel grade component control requirement in LF refining, and carrying out soft argon blowing for 8min after refining is finished, wherein the argon blowing flow is 300L/min.
The slag sample and the steel sample are taken after refining is finished, and chemical components and T.O analysis are carried out, and the results are shown in the following table:
example 2
Recycling the casting residue for the second time, and the recycling step comprises the following steps:
(1) Receiving the casting residue heat, wherein the converter endpoint temperature is 1651 ℃, the endpoint [ O ]643ppm, adding aluminum alloy for deoxidization after tapping 1/3 of the converter tapping, and the adding amount is 1.35kg/t of steel; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the violent stirring effect of the high-temperature molten steel in the tapping process, and the lime addition amount is 3.15kg/t of steel; after lime is added, stirring the bottom of the steel ladle by adopting large argon, wherein the argon blowing flow is 1100L/min, and continuing to blow argon and stir for 4min after tapping is finished;
(2) After the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, the addition amount of the aluminum iron is 0.72kg/t steel, and meanwhile argon blowing and stirring are carried out on the bottom of the ladle for 6min, and the argon blowing flow is 700L/min;
(3) Transferring molten steel to an LF furnace, and receiving hot casting residues of a casting end heat in a refining-continuous casting span;
(4) After recording and feeding back, pouring out a part of slag for recycling the casting residue after the casting is finished; pouring slag after the opening of the big ladle is tipped over by 90 degrees through a travelling crane, wherein the slag pouring time is 8s;
(5) After the deslagging is finished, directly pouring the residual casting residue steel slag into the surface of the molten steel of the receiving casting residue heat;
(6) After receiving casting residues, conveying the steel ladle to an LF processing station, heating molten steel to perform slag formation, and adding 1.05kg/t lime to further adjust slag when the temperature is increased to 1578 ℃;
(7) And carrying out desulfurization and alloying according to the steel grade component control requirement in LF refining, and carrying out soft argon blowing for 8.5min after refining is finished, wherein the argon blowing flow is 280L/min.
The slag sample and the steel sample are taken after refining is finished, and chemical components and T.O analysis are carried out, and the results are shown in the following table:
example 3
The casting residue is recycled for the fifth time, and the recycling step comprises the following steps:
(1) Receiving the casting residue heat, wherein the end temperature of the converter is 1648 ℃, the end point [ O ] is 610ppm, adding aluminum alloy for deoxidization after tapping 1/3 of tapping steel from the converter, and the adding amount is 2.00kg/t steel; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the violent stirring effect of the high-temperature molten steel in the tapping process, and the lime addition amount is 3.75kg/t of steel; after lime is added, stirring the bottom of the steel ladle by adopting large argon, wherein the argon blowing flow is 1200L/min, and continuing to blow argon and stir for 4.5min after tapping is finished;
(2) After the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, the addition amount of the aluminum iron is 0.80kg/t steel, and meanwhile, argon blowing and stirring are carried out on the bottom of the ladle for 5.5min, and the argon blowing flow is 650L/min;
(3) Transferring molten steel to an LF furnace, and receiving hot casting residues of a casting end heat in a refining-continuous casting span;
(4) After recording and feeding back, pouring out a part of slag for recycling the casting residue after the casting is finished; pouring slag after the opening of the big ladle is tipped over by 90 degrees through a travelling crane, wherein the slag pouring time is 10s;
(5) After the deslagging is finished, directly pouring the residual casting residue steel slag into the surface of the molten steel of the receiving casting residue heat;
(6) After receiving casting residues, conveying the steel ladle to an LF processing station, heating molten steel to perform slag formation, and adding 1.75kg/t lime to further adjust slag when the temperature is increased to 1580 ℃;
(7) And carrying out desulfurization and alloying according to the steel grade component control requirement in LF refining, and carrying out soft argon blowing for 8min after refining is finished, wherein the argon blowing flow is 250L/min.
The slag sample and the steel sample are taken after refining is finished, and chemical components and T.O analysis are carried out, and the results are shown in the following table:
example 4
The sixth recycling of casting residues, the recycling step:
(1) Receiving the casting residue heat, wherein the converter endpoint temperature is 1655 ℃, the endpoint [ O ] is 660ppm, adding aluminum alloy for deoxidization after tapping 1/3 of the converter tapping, and the adding amount is 1.85kg/t steel; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the violent stirring effect of the high-temperature molten steel in the tapping process, and the addition amount of the lime is 4.0kg/t of steel; after lime is added, stirring the bottom of the steel ladle by adopting large argon, wherein the argon blowing flow is 1100L/min, and continuing to blow argon and stir for 5min after tapping is finished;
(2) After the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, the addition amount of the aluminum iron is 1.0kg/t steel, and meanwhile, argon blowing and stirring are carried out on the bottom of the ladle for 6min, and the argon blowing flow is 700L/min;
(3) Transferring molten steel to an LF furnace, and receiving hot casting residues of a casting end heat in a refining-continuous casting span;
(4) After recording and feeding back, pouring out a part of slag for recycling the casting residue after the casting is finished; pouring slag after the opening of the big ladle is tipped over by 90 degrees through a travelling crane, wherein the slag pouring time is 9s;
(5) After the deslagging is finished, directly pouring the residual casting residue steel slag into the surface of the molten steel of the receiving casting residue heat;
(6) After receiving casting residues, conveying the steel ladle to an LF processing station, heating molten steel to perform slag formation, and adding 1.55kg/t lime to further adjust slag when the temperature is increased to 1577 ℃;
(7) And carrying out desulfurization and alloying according to the steel grade component control requirement in LF refining, and carrying out soft argon blowing for 8min after refining is finished, wherein the argon blowing flow is 200L/min.
The slag sample and the steel sample are taken after refining is finished, and chemical components and T.O analysis are carried out, and the results are shown in the following table:
according to the chemical composition and T.O analysis of the slag sample and the steel sample obtained after the refining of the embodiment 1-4, the S content in the slag sample after the fifth recycling of the casting residues can still reach 0.36%, and the S content in the steel sample is basically maintained to be about 0.0025%, and although the S content in the slag sample after the sixth recycling of the casting residues is reduced, the S content in the steel sample can reach about 0.002%, which proves that the desulfurization efficiency of the slag material controlled by the process method is still very stable after the repeated recycling.
The foregoing is merely exemplary embodiments of the present invention, and it should be noted that any changes and substitutions that would be easily recognized by those skilled in the art within the scope of the present invention are intended to be covered by the present invention, and the remaining details are not described in detail as prior art.
Claims (10)
1. A process method for continuously recycling hot casting residues in an LF ladle furnace is characterized by comprising the following steps:
s1, carrying out pre-deoxidation treatment on molten steel;
s2, receiving hot casting residues in a refining-continuous casting span of the pre-deoxidized molten steel:
s21, pouring casting residues of the steel ladle with the unreutilized overheated casting residues directly into the surface of molten steel; pouring out part of casting residue before recycling the recycled steel ladle with the hot casting residue, and directly pouring the rest steel slag into the surface of molten steel;
s22, after receiving the casting residue, conveying the ladle to an LF ladle furnace treatment station, heating molten steel to perform slag formation, and adding lime to further adjust slag when the temperature is increased to be more than 1575 ℃.
2. The process for continuously recycling LF ladle furnace with hot casting residues according to claim 1, wherein in step S21, the pouring amount control method of the casting residues for the ladle with recycled hot casting residues is as follows: and the slag flowing out after the opening of the big ladle is tipped over by 90 degrees for 8-10 s.
3. The process for continuously recycling the hot casting residues into the LF ladle furnace according to claim 1, wherein in the step S22, the lime is added in an amount of 0.85-1.75 per mill of steel.
4. The process method for continuously recycling the hot casting residues into the LF ladle furnace according to claim 1, wherein in the step S1, the pre-deoxidizing treatment process of the molten steel is as follows:
s11, tapping the converter to perform slag pre-adjustment: adding aluminum alloy for deoxidization after tapping 1/3; lime is added through a high-level bin when the converter is tapped for 2/3 by utilizing the intense stirring effect of the high-temperature molten steel in the tapping process; after lime is added, stirring the bottom of the ladle by adopting large argon, and continuing to blow argon for stirring after tapping is finished;
s12, after the ladle is transported to an argon station, aluminum iron is added on the surface of ladle slag to further remove slag and medium oxygen, and argon blowing stirring is carried out at the bottom of the ladle.
5. The process for continuously recycling LF ladle furnace with hot casting residues according to claim 4, wherein the addition amount of the aluminum alloy in step S11 is 1-2 per mill of steel.
6. The process for continuously recycling LF ladle furnace with hot casting residues according to claim 4 or 5, wherein in step S11, the lime is added in an amount of 2-4%o of steel.
7. The process method for continuously recycling the hot casting residues into the LF ladle furnace according to claim 4, wherein in the step S11, the argon blowing flow of large argon stirring is 800-1200L/min.
8. The process method for continuously recycling the hot casting residues into the LF ladle furnace according to claim 4 or 7, wherein in the step S11, argon blowing stirring is continued for more than or equal to 3min after tapping is finished.
9. The process for continuously recycling LF ladle furnace with hot casting residues according to claim 4, wherein in the step S12, the addition amount of aluminum iron is 0.5-1 per mill of steel.
10. The process method for continuously recycling the hot casting residues into the LF ladle furnace according to claim 4 or 9, wherein in the step S12, argon is blown into the bottom of the ladle and stirred for 5-8 min, and the argon blowing flow is 500-700L/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116479214A (en) * | 2023-06-19 | 2023-07-25 | 江苏省沙钢钢铁研究院有限公司 | Synthetic slag and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116479214A (en) * | 2023-06-19 | 2023-07-25 | 江苏省沙钢钢铁研究院有限公司 | Synthetic slag and preparation method and application thereof |
| CN116479214B (en) * | 2023-06-19 | 2023-10-27 | 江苏省沙钢钢铁研究院有限公司 | Synthetic slag and preparation method and application thereof |
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