CN111635973A - Method for removing titanium from molten iron of converter - Google Patents
Method for removing titanium from molten iron of converter Download PDFInfo
- Publication number
- CN111635973A CN111635973A CN202010501955.0A CN202010501955A CN111635973A CN 111635973 A CN111635973 A CN 111635973A CN 202010501955 A CN202010501955 A CN 202010501955A CN 111635973 A CN111635973 A CN 111635973A
- Authority
- CN
- China
- Prior art keywords
- titanium
- molten iron
- tapping
- iron
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
Abstract
The invention belongs to the technical field of steel making, and particularly relates to a method for removing titanium from molten iron of a converter, which comprises the following steps: adding a titanium removing agent into molten iron in a blast furnace iron tapping channel before tapping in a ironworks; then adding a titanium removing agent into the iron ladle in the process of iron tapping at a steel mill pouring station; before the KR desulfurization station is desulfurized, removing the titanium-removed slag; after the KR desulfurization station completes desulfurization, converter blowing is carried out; tapping after the converter blowing is finished; wherein the mass ratio of the titanium removing agent to the molten iron in the blast furnace tapping channel is (1.5-1.8) kg (0.9-1.0) t; in the process of tapping at the steel plant backflow station, the adding speed of the titanium removing agent is 60-260 kg/min; the mass ratio of the titanium removing agent to the molten iron in the iron ladle is (2-8) kg and (0.9-1.0) t. According to the method, a series of optimization and control of the titanium removing agent, the titanium removing slag removal, the converter blowing and the like are performed, so that the steel with low titanium content and various corresponding products are obtained, and the average titanium content is controlled to be 0.0005-0.0006%.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a method for removing titanium from molten iron in a converter.
Background
Titanium in molten steel is easy to form fine and stable TiC and TiN, and the fine inclusions can reduce the purity of the steel, cause continuous casting water nodulation or crystallizer fish formation, and further influence various performances of the steel. Therefore, for high quality clean steel, it is particularly important to control the titanium content in the steel.
In addition, in the field of steel making technology, titanium element is added as an alloy element to most steel grades. However, in a small part of steel grades (such as silicon steel), titanium element becomes a harmful element, and the existence of titanium element can affect the fatigue performance and electromagnetic performance of the steel grade. Generally, for steel grades such as silicon steel, the titanium content cannot exceed 0.0020%.
At present, no method for effectively and stably removing titanium from molten iron in a converter at low cost exists.
Disclosure of Invention
In view of the above problems, the present invention provides a method for removing titanium from molten iron in a converter. According to the method, a series of processes such as titanium removal by adding a titanium removal agent, titanium removal slag removal, converter blowing and the like are sequentially added, and the processes are optimized and controlled, so that the steel with low titanium content and various corresponding products thereof are obtained, and the average titanium content is controlled to be 0.0005-0.0006%.
The technical scheme of the invention for realizing the purpose is as follows:
the invention provides a method for removing titanium from molten iron in a converter, which comprises the following steps:
adding a titanium removing agent into molten iron in a blast furnace iron tapping channel before tapping in a ironworks;
then adding a titanium removing agent into the iron ladle in the process of iron tapping at a steel mill pouring station;
before the KR desulfurization station is desulfurized, removing the titanium-removed slag;
after the KR desulfurization station completes desulfurization, converter blowing is carried out;
tapping after the converter blowing is finished;
wherein:
the adding of the titanium removing agent into the molten iron of the blast furnace iron tapping channel before iron tapping in the iron works comprises the following steps: the mass ratio of the titanium removing agent to the molten iron in the blast furnace tapping channel is (1.5-1.8) kg (0.9-1.0) t (namely 1.5-1.8 kg of the titanium removing agent is added in each (0.9-1.0) ton of molten iron);
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: the adding rate of the titanium removing agent is 60-260 kg/min; the mass ratio of the titanium removing agent to the molten iron in the iron ladle is (2-8) kg (0.9-1.0) t in percentage by mass.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the adding a titanium removing agent into an iron ladle during a tapping process at a down-flow station of a steel mill comprises: the titanium removing agent is completely added 2-3 min before the tapping is finished; the tapping time is 8-10 min per ladle;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the adding a titanium removing agent into an iron ladle during a tapping process at a down-flow station of a steel mill comprises: the adding rate of the titanium removing agent is 224 kg/min; according to the mass percentage, the mass ratio of the titanium removing agent to the molten iron in the iron ladle is 5.3kg to 1 t.
In one embodiment, the method for removing titanium from molten iron in a converter according to the present invention, wherein the adding a titanium removing agent to molten iron in a tapping runner of a blast furnace before tapping in a foundry, comprises: the titanium removing agent is iron scale;
in the process of tapping at the steel plant backflow station, the step of adding the titanium removing agent into the iron ladle comprises the following steps: the titanium removing agent is pellet ore.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the molten iron in the tapping channel of the blast furnace comprises, by mass: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si;
in a preferred embodiment, the method for removing titanium from molten iron in a converter according to the present invention, wherein a titanium removing agent is added to molten iron in a tapping runner of a blast furnace before tapping in the ironworks, comprises: before tapping in the iron works, adding a titanium removing agent into molten iron in a tapping channel of a blast furnace for titanium removal; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti;
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: adding a titanium removing agent into the iron ladle to remove titanium in the process of iron tapping at a steel plant backflow station; after the tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the removing titanium-removed slag before the KR desulfurization station is used for desulfurization includes: before the KR desulfurization station is used for desulfurization, the titanium-removed slag is completely removed, so that the bright surface of molten iron is more than 90%; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two scraping is 3.5-4.5 min; in the process of the KR desulfurization station desulfurization, the mass ratio of a desulfurizing agent (commercially available, such as Nanjing Yongneng New Material Limited company, Weifang Mien chemical Limited company and the like) to molten iron in the iron ladle is (6-6.7) kg (0.9-1.0) t;
after the KR desulfurization station is desulfurized, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the converter blowing includes: loading converting materials into a converter, carrying out primary gun-off oxygen supply converting, stopping converting after 5-6 min, lifting a gun and deslagging; after the slag dumping is finished, blowing slag charge is loaded into the converter, and secondary gun-off oxygen supply blowing is carried out;
wherein the blowing materials are scrap steel and pellet ore, and the mass ratio of the scrap steel to the molten iron in the converter is (23-26) to (206-208); the mass ratio of the pellets to the molten iron in the converter is (15-45) kg and (0.9-1.1) t;
the blowing slag materials are lime and light-burned dolomite; wherein, the light burned white is calculated according to the mass percentageThe marble comprises: CaO 50-55%, MgO 38-42%, SiO21-5 percent, and the balance of impurity elements.
In one embodiment, in the method for removing titanium from molten iron in a converter, the temperature of the molten iron in the converter is 1270-1330 ℃ in the first lance-feeding oxygen supply blowing process;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the slag pouring speed is 1.3-1.8 t/min in the process of lifting a lance and pouring slag; the mass ratio of the slag pouring amount to the molten iron in the converter is (30-45) kg and (0.9-1.1) t;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the process of lifting the lance and pouring the slag comprises TiO according to mass percentage2More than or equal to 2.5 percent of converter semisteel slag is poured out.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the charging of blown slag in the converter includes: the lime and the light-burned dolomite are filled into a converter, and the mass ratio of the lime to the molten iron in the converter is (3.8-4.5) to (206-208); the mass ratio of the light-burned dolomite to the molten iron in the converter is (1-1.5) to (206-208);
in a preferred embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the second lance-fed oxygen blowing includes: when the oxygen supply amount is 80% of the normal oxygen supply amount, light-burned dolomite is loaded in the converter, and the blowing is continued;
wherein the light-burned dolomite comprises the following components in percentage by mass: CaO 50-55%, MgO 38-42%, SiO21-5%, the balance being impurity elements;
the mass ratio of the light-burned dolomite to the molten iron in the converter is (2.6-2.8) to (206-208);
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the temperature of the molten iron in the converter is 1400 to 1500 ℃ during the second lance-off oxygen supply blowing.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, tapping after completion of converter blowing includes: after the converter blowing is finished, slag stopping and tapping are carried out; wherein the tapping temperature is 1643-1650 ℃; the invention adopts the sliding plate to block slag and tap, controls the front slag to enter the steel ladle, adopts a mode of 'fast shaking full driving' in the tapping process, further reduces the slag entering the steel ladle in the tapping process, and simultaneously adopts the residual steel in the converter and the timely wrong operation after the tapping is finished, thereby avoiding the slag entering the steel ladle after the tapping is finished.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the steel slab obtained after tapping comprises, by mass: 0.0005 to 0.0006% of Ti.
One or more technical embodiments of the present invention have at least the following technical effects or advantages:
(1) according to the invention, before tapping in a foundry, a titanium removing agent is added into the molten iron in the tapping channel of the blast furnace to ensure that Ti in the molten iron in the tapping channel of the blast furnace is less than or equal to 0.1 percent; and then in the process of tapping at a steel plant pouring station, controlling the adding speed of the titanium removing and titanium removing agent, completely adding the titanium removing agent 2-3 min before tapping, controlling the tapping time to be 8-10 min/ladle, avoiding ladle turning danger caused by severe reaction, ensuring that the titanium removing agent can fully react, and removing titanium from molten iron with maximum efficiency;
(2) before the KR desulfurization station is used for desulfurization, the titanium-removed slag is completely removed, so that the bright surface of molten iron is more than 90%; after desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; aiming at the problem that the titanium-removed slag in the ladle transfer station can float to the top of the ladle, the titanium-removed slag and the desulfurized slag are removed in time, so that the bright surface of molten iron meets the optimal requirement, the desulfurization effect is improved to the maximum extent, the consumption of a desulfurizing agent is reduced, and the subsequent titanium return phenomenon is avoided;
(3) the invention limits that the oxygen supply blowing is stopped after 5-6 min after the first time, the gun is lifted for deslagging, and the converter is controlled to be turned over through a slag blowing device (the slag blowing device is a main pipe, 5 branch pipes are formed, the water cooling function is realized, the used medium is nitrogen gas)Slag speed and deslagging amount; the inventor finds that titanium element is an extremely easy-to-oxidize element through a large number of experiments, under the condition of first oxygen supply blowing, basically all titanium components in molten iron are oxidized into steel slag after 5-6 min, at the moment, the steel slag is poured out, and proper deslagging speed and deslagging amount are controlled, namely, high-content TiO is equivalent to controlling deslagging speed and deslagging amount2Substances are poured out, so that the influence of subsequent steel slag on the titanium return of molten steel is reduced;
(4) in the process of converting and converting in the converter, materials such as scrap steel, pellets, ore lime and light-burned dolomite are added; the inventors have realized that these materials can more efficiently dilute the TiO in the slag2In the future, even if steel slag is generated during and after tapping of the converter, the steel slag introduced into the ladle is TiO2The content is relatively low, so that the titanium return of the molten steel is further reduced;
(5) in the process of secondary gun-off oxygen supply blowing, the invention limits that when oxygen supply blowing is carried out until the oxygen supply amount is 80 percent of the normal oxygen supply amount, light-burned dolomite is loaded into the converter again, and blowing is continued; the process is matched with the previous process, so that the thickening of the slag is better realized, the viscosity and the melting point of the slag are further improved, and the slag discharging in the tapping process is reduced;
(6) in the invention, the processes of adding a titanium removing agent for removing titanium, removing titanium-removed slag, converting by a converter and the like are balanced and optimized, slag is blocked and steel is discharged after converting by the converter is finished, a sliding plate is adopted for blocking slag and discharging steel, the front slag is controlled to enter a steel ladle, a mode of 'quickly shaking and fully driving' is adopted in the steel discharging process, the slag in the steel discharging process is further reduced to enter the steel ladle, and meanwhile, the residual steel in the converter is adopted after the steel discharging is finished, the operation of vehicle staggering is carried out in time, and the situation that the slag enters the steel ladle after the steel discharging is finished is avoided; by effectively combining the series of operation steps, the invention can successfully smelt low-titanium varieties to obtain steel with low titanium content and various corresponding products thereof, and the average titanium content is controlled to be 0.0005-0.0006%.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the invention provides a method for removing titanium from molten iron in a converter, which comprises the following steps:
adding a titanium removing agent into molten iron in a blast furnace iron tapping channel before tapping in a ironworks;
then adding a titanium removing agent into the iron ladle in the process of iron tapping at a steel mill pouring station;
before the KR desulfurization station is desulfurized, removing the titanium-removed slag;
after the KR desulfurization station completes desulfurization, converter blowing is carried out;
tapping after the converter blowing is finished;
wherein:
the adding of the titanium removing agent into the molten iron of the blast furnace iron tapping channel before iron tapping in the iron works comprises the following steps: the mass ratio of the titanium removing agent to the molten iron of the blast furnace tapping channel is (1.5-1.8) kg (0.9-1.0) t;
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: the adding rate of the titanium removing agent is 60-260 kg/min; the mass ratio of the titanium removing agent to the molten iron in the iron ladle is (2-8) kg (0.9-1.0) t in percentage by mass.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the adding a titanium removing agent into an iron ladle during a tapping process at a down-flow station of a steel mill comprises: the titanium removing agent is completely added 2-3 min before the tapping is finished; the tapping time is 8-10 min per ladle;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the adding a titanium removing agent into an iron ladle during a tapping process at a down-flow station of a steel mill comprises: the adding rate of the titanium removing agent is 224 kg/min; according to the mass percentage, the mass ratio of the titanium removing agent to the molten iron in the iron ladle is 5.3kg to 1 t.
In one embodiment, the method for removing titanium from molten iron in a converter according to the present invention, wherein the adding a titanium removing agent to molten iron in a tapping runner of a blast furnace before tapping in a foundry, comprises: the titanium removing agent is iron scale;
in the process of tapping at the steel plant backflow station, the step of adding the titanium removing agent into the iron ladle comprises the following steps: the titanium removing agent is pellet ore.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the molten iron in the tapping channel of the blast furnace comprises, by mass: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si;
in a preferred embodiment, the method for removing titanium from molten iron in a converter according to the present invention, wherein a titanium removing agent is added to molten iron in a tapping runner of a blast furnace before tapping in the ironworks, comprises: before tapping in the iron works, adding a titanium removing agent into molten iron in a tapping channel of a blast furnace for titanium removal; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti;
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: adding a titanium removing agent into the iron ladle to remove titanium in the process of iron tapping at a steel plant backflow station; after the tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the removing titanium-removed slag before the KR desulfurization station is used for desulfurization includes: before the KR desulfurization station is used for desulfurization, the titanium-removed slag is completely removed, so that the bright surface of molten iron is more than 90%; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two scraping is 3.5-4.5 min; in the process of the KR desulfurization station desulfurization, the mass ratio of a desulfurizing agent (commercially available) to molten iron in the iron ladle is (6-6.7) kg (0.9-1.0) t;
after the KR desulfurization station is desulfurized, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the converter blowing includes: loading converting materials into a converter, carrying out primary gun-off oxygen supply converting, stopping converting after 5-6 min, lifting a gun and deslagging; after the slag dumping is finished, blowing slag charge is loaded into the converter, and secondary gun-off oxygen supply blowing is carried out;
wherein the blowing materials are scrap steel and pellet ore, and the mass ratio of the scrap steel to the molten iron in the converter is (23-26) to (206-208); the mass ratio of the pellets to the molten iron in the converter is (15-45) kg and (0.9-1.1) t;
the blowing slag materials are lime and light-burned dolomite; wherein the light-burned dolomite comprises the following components in percentage by mass: CaO 50-55%, MgO 38-42%, SiO21-5 percent, and the balance of impurity elements.
In one embodiment, in the method for removing titanium from molten iron in a converter, the temperature of the molten iron in the converter is 1270-1330 ℃ in the first lance-feeding oxygen supply blowing process;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the slag pouring speed is 1.3-1.8 t/min in the process of lifting a lance and pouring slag; the mass ratio of the slag pouring amount to the molten iron in the converter is (30-45) kg and (0.9-1.1) t;
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the process of lifting the lance and pouring the slag comprises TiO according to mass percentage2More than or equal to 2.5 percent of converter semisteel slag is poured out.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the charging of blown slag in the converter includes: the lime and the light-burned dolomite are filled into a converter, and the mass ratio of the lime to the molten iron in the converter is (3.8-4.5) to (206-208); the mass ratio of the light-burned dolomite to the molten iron in the converter is (1-1.5) to (206-208);
in a preferred embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the second lance-fed oxygen blowing includes: when the oxygen supply amount is 80% of the normal oxygen supply amount, light-burned dolomite is loaded in the converter, and the blowing is continued;
wherein the light-burned dolomite comprises the following components in percentage by mass: CaO 50-55%, MgO 38-42%, SiO21-5%, the balance being impurity elements;
the mass ratio of the light-burned dolomite to the molten iron in the converter is (2.6-2.8) to (206-208);
in a preferred embodiment, in the method for removing titanium from molten iron in a converter, the temperature of the molten iron in the converter is 1400 to 1500 ℃ during the second lance-off oxygen supply blowing.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, tapping after completion of converter blowing includes: after the converter blowing is finished, slag stopping and tapping are carried out; wherein the tapping temperature is 1643-1650 ℃; the invention adopts the sliding plate to block slag and tap, controls the front slag to enter the steel ladle, adopts a mode of 'fast shaking full driving' in the tapping process, further reduces the slag entering the steel ladle in the tapping process, and simultaneously adopts the residual steel in the converter and the timely wrong operation after the tapping is finished, thereby avoiding the slag entering the steel ladle after the tapping is finished.
In one embodiment, in the method for removing titanium from molten iron in a converter according to the present invention, the steel slab obtained after tapping comprises, by mass: 0.0005 to 0.0006% of Ti.
Example 1:
in this embodiment, the method for removing titanium from molten iron in the converter includes the following steps:
(1) adding iron scale into molten iron of a blast furnace iron tapping channel before tapping in an iron works, wherein the mass ratio of the iron scale to the molten iron of the blast furnace iron tapping channel is 1.5kg:0.9 t; before the titanium removal is started, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti;
(2) the molten iron obtained in the step (1) is transported to a steel plant through a torpedo ladle, and iron tapping is carried out at a ladle pouring station, wherein pellets are added into an iron ladle in the iron tapping process at the ladle pouring station of the steel plant, and the adding rate of the pellets is 60 kg/min; according to the mass percentage, the mass ratio of the pellets to the molten iron in the iron ladle is 2kg to 0.9 t; adding all the pellets 2min before the tapping is finished; tapping time is 8 min/ladle; after tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti
(3) Hoisting the molten iron obtained in the step (2) to a KR desulfurization station through an overhead crane for desulfurization; wherein before KR desulfurization station desulfurization, the molten iron bright surface is more than 90% after the titanium-removed slag is completely removed; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two raking-off is 3.5 min; in the process of desulfurization of the KR desulfurization station, the mass ratio of a desulfurizing agent (commercially available) to molten iron in the iron ladle is 6kg:0.9t in percentage by mass; after desulfurization, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent;
(4) after the desulfurization in the step (3) is finished, charging the obtained molten iron 206t into a converter for converter blowing; charging 23t of scrap steel and 3.43t of pellet ore into a converter, carrying out first lance-off oxygen supply blowing, wherein the temperature of molten iron is 1270 ℃, stopping blowing after 5min, extracting a lance and deslagging, wherein the deslagging speed is 1.3t/min, the deslagging amount is 6.87t, and TiO is contained in the process of extracting the lance and deslagging by mass percentage2Pouring more than or equal to 2.5 percent of converter semisteel slag; then, the lime 3.8t and the light-burned dolomite 1t are loaded into the converter for the second time of blowing by oxygen supply from a lance, the temperature of the molten iron is 1400 ℃, and when the oxygen supply is blownWhen the oxygen supply amount is 80 percent of the normal oxygen supply amount, light-burned dolomite is loaded into the converter for 2.6t again, and the temperature is measured and the sampling is carried out when the converter is blown to the end point, wherein the end point temperature is 1643 ℃;
the dolomite comprises: CaO 50%, MgO 38%, SiO21 percent, and the balance of impurity elements;
(5) after the converting furnace blowing in the step (4) is finished, stopping slag by adopting a sliding plate at the temperature of 1643 ℃ to tap steel, controlling front slag to enter a steel ladle, adopting a 'quick-swing full-driving' mode in the tapping process, further reducing the slag in the tapping process to enter the steel ladle, and simultaneously adopting residual steel in the converting furnace and timely wrong operation after the tapping is finished to avoid the slag from entering the steel ladle after the tapping is finished; after tapping, the steel slab obtained has a low titanium content, which is 0.0006%.
Example 2:
in this embodiment, the method for removing titanium from molten iron in the converter includes the following steps:
(1) adding iron scale into molten iron of a blast furnace iron tapping channel before tapping in an iron works, wherein the mass ratio of the iron scale to the molten iron of the blast furnace iron tapping channel is 1.8kg:1.0 t; before the titanium removal is started, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti;
(2) the molten iron obtained in the step (1) is transported to a steel plant through a torpedo ladle, and iron tapping is carried out at a ladle pouring station, wherein pellets are added into an iron ladle in the iron tapping process at the ladle pouring station of the steel plant, and the adding rate of the pellets is 224 kg/min; according to the mass percentage, the mass ratio of the pellets to the molten iron in the iron ladle is 5.3kg to 1 t; adding all the pellets 3min before the tapping is finished; tapping time is 10 min/ladle; after tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti
(3) Hoisting the molten iron obtained in the step (2) to a KR desulfurization station through an overhead crane for desulfurization; wherein before KR desulfurization station desulfurization, the molten iron bright surface is more than 90% after the titanium-removed slag is completely removed; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two raking-off is 4.5 min; in the process of desulfurization of the KR desulfurization station, the mass ratio of a desulfurizing agent (commercially available) to molten iron in the iron ladle is 6.7kg to 1.0t in percentage by mass; after desulfurization, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent;
(4) after the desulfurization in the step (3) is finished, charging 208t of the obtained molten iron into a converter, and carrying out converter blowing; loading 26t of scrap steel and 8.5t of pellet ore into a converter, carrying out primary lance-off oxygen supply blowing, wherein the temperature of molten iron is 1330 ℃, stopping blowing after 6min, lifting a lance and deslagging, wherein the deslagging speed is 1.8t/min, the deslagging amount is 8.5t, and TiO is contained in the process of lifting the lance and deslagging by mass percentage2Pouring more than or equal to 2.5 percent of converter semisteel slag; then 4.5t of lime and 1.5t of light-burned dolomite are loaded into the converter for secondary lance-off oxygen supply blowing, the temperature of molten iron is 1500 ℃, when oxygen supply blowing is carried out until the oxygen supply amount is 80% of the normal oxygen supply amount, 2.8t of light-burned dolomite is loaded into the converter again, blowing is carried out until the end point temperature is measured, and sampling is carried out, wherein the end point temperature is 1650 ℃;
the dolomite comprises: 55% of CaO, 42% of MgO and SiO25 percent, and the balance of impurity elements;
(5) after the converting furnace blowing in the step (4) is finished, stopping slag by adopting a sliding plate at the temperature of 1650 ℃ to tap steel, controlling front slag to enter a steel ladle, adopting a 'fast-rocking full-driving' mode in the tapping process, further reducing slag in the tapping process to enter the steel ladle, and simultaneously adopting residual steel in the converting furnace and timely wrong operation after the tapping is finished to avoid slag from entering the steel ladle after the tapping is finished; after tapping, the steel slab obtained had a low titanium content of 0.0005%.
Example 3:
in this embodiment, the method for removing titanium from molten iron in the converter includes the following steps:
(1) adding iron scale into molten iron of a blast furnace iron tapping channel before tapping in an iron works, wherein the mass ratio of the iron scale to the molten iron of the blast furnace iron tapping channel is 1.5kg:0.9 t; before the titanium removal is started, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti;
(2) the molten iron obtained in the step (1) is transported to a steel plant through a torpedo ladle, and iron tapping is carried out at a ladle pouring station, wherein pellets are added into an iron ladle in the iron tapping process at the ladle pouring station of the steel plant, and the adding rate of the pellets is 260 kg/min; according to the mass percentage, the mass ratio of the pellets to the molten iron in the iron ladle is 8kg:1.1 t; adding all the pellets 2min before the tapping is finished; tapping time is 8 min/ladle; after tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti
(3) Hoisting the molten iron obtained in the step (2) to a KR desulfurization station through an overhead crane for desulfurization; wherein before KR desulfurization station desulfurization, the molten iron bright surface is more than 90% after the titanium-removed slag is completely removed; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two raking-off is 3.5 min; in the process of desulfurization of the KR desulfurization station, the mass ratio of a desulfurizing agent (commercially available) to molten iron in the iron ladle is 6kg:0.9t in percentage by mass; after desulfurization, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent;
(4) after the desulfurization in the step (3) is finished, charging the obtained molten iron 206t into a converter for converter blowing; charging 23t of scrap steel and 3.43t of pellet ore into a converter, carrying out primary lance-off oxygen supply blowing, wherein the temperature of molten iron is 1330 ℃, stopping blowing after 5min, lifting a lance for deslagging, wherein the deslagging speed is 1.3t/min, the deslagging amount is 6.87t, and TiO is contained in the process of lifting the lance for deslagging according to mass percentage2Pouring more than or equal to 2.5 percent of converter semisteel slag; then, filling lime 3.8t and light-burned dolomite 1t into the converter, and carrying out secondary lance-off oxygen supply blowing, wherein the temperature of molten iron is 1400 ℃, when oxygen supply blowing is carried out until the oxygen supply amount is 80% of the normal oxygen supply amount, filling light-burned dolomite 2.6t into the converter again, and carrying out blowing to the end point, temperature measurement and sampling, wherein the end point temperature is 1643 ℃;
the dolomite comprises: CaO 50%, MgO 38%, SiO21%, the restIs an impurity element;
(5) after the converting furnace blowing in the step (4) is finished, stopping slag by adopting a sliding plate at the temperature of 1643 ℃ to tap steel, controlling front slag to enter a steel ladle, adopting a 'quick-swing full-driving' mode in the tapping process, further reducing the slag in the tapping process to enter the steel ladle, and simultaneously adopting residual steel in the converting furnace and timely wrong operation after the tapping is finished to avoid the slag from entering the steel ladle after the tapping is finished; after tapping, the steel slab obtained has a low titanium content, which is 0.0006%.
Comparative example 1:
the method for removing titanium from molten iron in the converter comprises the following steps:
(1) adding iron scale into molten iron of a blast furnace iron tapping channel before tapping in an iron works, wherein the mass ratio of the iron scale to the molten iron of the blast furnace iron tapping channel is 1.0kg:1.1 t;
(2) the molten iron obtained in the step (1) is transported to a steel plant through a torpedo ladle, and iron tapping is carried out at a ladle pouring station, wherein pellets are added into an iron ladle in the iron tapping process at the ladle pouring station of the steel plant, and the adding rate of the pellets is 50 kg/min; according to the mass percentage, the mass ratio of the pellets to the molten iron in the iron ladle is 10kg to 1.1 t; after tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.070-0.075 percent of Ti
(3) Hoisting the molten iron obtained in the step (2) to a KR desulfurization station through an overhead crane for desulfurization;
(4) after the desulfurization in the step (3) is finished, charging the obtained molten iron 206t into a converter for converter blowing; 18t of scrap steel and 2t of pellet ore are loaded into a converter, the first gun-off oxygen supply blowing is carried out, the temperature of molten iron is 1200 ℃, the gun is lifted to pour slag after the blowing is stopped, the slag pouring speed is 1.9t/min, and the slag pouring amount is 5 t; then, filling lime 2t into the converter, and carrying out secondary lance-off oxygen supply blowing, wherein the temperature of molten iron is 1590 ℃ and the end point temperature is 1643 ℃;
(5) and (5) tapping after the converter blowing in the step (4) is finished, wherein the obtained steel plate blank has low titanium content, and the titanium content is 0.0007%.
Comparative example 2:
the method for removing titanium from molten iron in the converter comprises the following steps:
(1) adding iron scale into molten iron of a blast furnace iron tapping channel before tapping in an iron works, wherein the mass ratio of the iron scale to the molten iron of the blast furnace iron tapping channel is 1.9kg:0.8 t;
(2) the molten iron obtained in the step (1) is transported to a steel plant through a torpedo ladle, and iron tapping is carried out at a ladle pouring station, wherein pellets are added into an iron ladle in the iron tapping process at the ladle pouring station of the steel plant, and the adding rate of the pellets is 270 kg/min; according to the mass percentage, the mass ratio of the pellets to the molten iron in the iron ladle is 1kg to 0.8 t; after tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.075-0.079% of Ti
(3) Hoisting the molten iron obtained in the step (2) to a KR desulfurization station through an overhead crane for desulfurization;
(4) after the desulfurization in the step (3) is finished, charging the obtained molten iron 206t into a converter for converter blowing; 18t of scrap steel and 5t of pellet ore are loaded into a converter, the first gun-off oxygen supply blowing is carried out, the temperature of molten iron is 1200 ℃, the gun is lifted to pour slag after the blowing is stopped, the slag pouring speed is 1.2t/min, and the slag pouring amount is 4.5 t; then 2.5t of lime is filled into the converter, and secondary lance-off oxygen supply blowing is carried out, wherein the temperature of molten iron is 1590 ℃ and the end point temperature is 1643 ℃;
(5) and (5) tapping after the converter blowing in the step (4) is finished, wherein the obtained steel plate blank has low titanium content, and the titanium content is 0.00075%.
Through the above examples and comparative examples, the present invention has at least the following technical effects or advantages:
(1) the method controls the adding rate of the titanium removing and titanium removing agent and the tapping time, thereby avoiding ladle turning danger caused by violent reaction, ensuring that the titanium removing agent realizes full reaction and being capable of removing titanium from molten iron with maximum efficiency;
(2) before the KR desulfurization station is used for desulfurization, the titanium-removed slag is completely removed, so that the bright surface of molten iron is more than 90%; after desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; thus, the desulfurization effect is improved to the maximum extent, the consumption of the desulfurizer is reduced, and the subsequent titanium return phenomenon is avoided;
(3) in the process of converting and converting in the converter, materials such as scrap steel, pellets, ore lime and light-burned dolomite are added and are optimized by corresponding processes, so that the titanium return of molten steel is further reduced;
(5) the invention optimizes the blowing process of oxygen supply by the lance, and the process is matched with the previous process, thereby better realizing the thickening of the slag, further improving the viscosity and melting point of the slag and reducing the slag discharge in the tapping process;
(6) the process comprises the steps of adding a titanium removing agent for removing titanium, removing titanium-removed slag, converting in a converter, blocking slag and tapping after converting in the converter is finished, blocking slag and tapping by adopting a sliding plate, controlling front slag to enter a steel ladle, adopting a mode of 'quickly shaking and fully driving' in the tapping process, further reducing slag in the tapping process to enter the steel ladle, simultaneously adopting residual steel in the converter after tapping, and timely carrying out wrong operation, so as to prevent slag from entering the steel ladle after tapping; by effectively combining the series of operation steps, the invention can successfully smelt low-titanium varieties to obtain steel with low titanium content and various corresponding products thereof, and the average titanium content is controlled to be 0.0005-0.0006%.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for removing titanium from molten iron in a converter comprises the following steps:
adding a titanium removing agent into molten iron in a blast furnace iron tapping channel before tapping in a ironworks;
then adding a titanium removing agent into the iron ladle in the process of iron tapping at a steel mill pouring station;
before the KR desulfurization station is desulfurized, removing the titanium-removed slag;
after the KR desulfurization station completes desulfurization, converter blowing is carried out;
tapping after the converter blowing is finished;
wherein:
the adding of the titanium removing agent into the molten iron of the blast furnace iron tapping channel before iron tapping in the iron works comprises the following steps: the mass ratio of the titanium removing agent to the molten iron of the blast furnace tapping channel is (1.5-1.8) kg (0.9-1.0) t;
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: the adding rate of the titanium removing agent is 60-260 kg/min; the mass ratio of the titanium removing agent to the molten iron in the iron ladle is (2-8) kg (0.9-1.0) t in percentage by mass.
2. The method for removing titanium from molten iron in a converter according to claim 1, wherein the step of adding a titanium removing agent into the iron ladle in the process of tapping at the pouring station of the steel mill comprises the following steps: the titanium removing agent is completely added 2-3 min before the tapping is finished; the tapping time is 8-10 min per ladle;
preferably, the adding of the titanium removing agent into the iron ladle in the process of iron tapping at the steel mill pouring station comprises the following steps: the adding rate of the titanium removing agent is 224 kg/min; according to the mass percentage, the mass ratio of the titanium removing agent to the molten iron in the iron ladle is 5.3kg to 1 t.
3. The method for removing titanium from molten iron in a converter according to claim 1 or 2, wherein the step of adding a titanium removing agent to the molten iron in the tapping channel of the blast furnace before tapping in the ironworks comprises: the titanium removing agent is iron scale;
in the process of tapping at the steel plant backflow station, the step of adding the titanium removing agent into the iron ladle comprises the following steps: the titanium removing agent is pellet ore.
4. The method for removing titanium from molten iron in a converter according to claim 1 or 2, wherein the molten iron in the tapping runner of the blast furnace comprises, in mass percent: less than or equal to 0.1 percent of Ti and 0.35 to 0.40 percent of Si;
preferably, before tapping in the iron works, the method for adding the titanium removing agent into the molten iron in the tapping channel of the blast furnace comprises the following steps: before tapping in the iron works, adding a titanium removing agent into molten iron in a tapping channel of a blast furnace for titanium removal; after the titanium removal is finished, the molten iron of the blast furnace tapping channel comprises the following components in percentage by mass: 0.08-0.098% of Ti0.08;
in the process of tapping at the steel plant backflow station, a titanium removing agent is added into the iron ladle, and the method comprises the following steps: adding a titanium removing agent into the iron ladle to remove titanium in the process of iron tapping at a steel plant backflow station; after the tapping is finished, the molten iron in the iron ladle comprises the following components in percentage by mass: 0.060 to 0.065% of Ti.
5. The method for removing titanium from molten iron in a converter according to claim 1 or 2, wherein the step of removing titanium-removed slag before the step of removing sulfur in the KR desulfurization station comprises the following steps: before the KR desulfurization station is used for desulfurization, the titanium-removed slag is completely removed, so that the bright surface of molten iron is more than 90%; after the KR desulfurization station is used for desulfurization, the desulfurization slag is removed twice, so that the bright surface of the molten iron is more than 97 percent; the time interval between the two scraping is 3.5-4.5 min; in the process of the KR desulfurization station desulfurization, the mass ratio of the desulfurizing agent to the molten iron in the iron ladle is (6-6.7) kg and (0.9-1.0) t;
after the KR desulfurization station is desulfurized, the molten iron comprises the following components in percentage by mass: s is less than or equal to 0.0015 percent.
6. The method for removing titanium from molten iron in a converter according to claim 1 or 2, wherein the converter blowing comprises: loading converting materials into a converter, carrying out primary gun-off oxygen supply converting, stopping converting after 5-6 min, lifting a gun and deslagging; after the slag dumping is finished, blowing slag charge is loaded into the converter, and secondary gun-off oxygen supply blowing is carried out;
wherein the blowing materials are scrap steel and pellet ore, and the mass ratio of the scrap steel to the molten iron in the converter is (23-26) to (206-208); the mass ratio of the pellets to the molten iron in the converter is (15-45) kg and (0.9-1.1) t;
the blowing slag materials are lime and light-burned dolomite; wherein the light-burned dolomite comprises the following components in percentage by mass: 50-55% of CaO, 38-42% of MgO and SiO21-5 percent, and the balance of impurity elements.
7. The method for removing titanium from molten iron in a converter according to claim 6, wherein in the first lance-feeding oxygen supply blowing process, the temperature of the molten iron in the converter is 1270-1330 ℃;
preferably, in the process of lifting the gun and pouring the slag, the slag pouring speed is 1.3-1.8 t/min; the mass ratio of the slag pouring amount to the molten iron in the converter is (30-45) kg and (0.9-1.1) t;
preferably, in the process of lifting the gun and pouring slag, TiO is contained by mass percent2More than or equal to 2.5 percent of converter semisteel slag is poured out.
8. The method for removing titanium from molten iron in a converter according to claim 6, wherein the charging of blowing slag in the converter comprises: the lime and the light-burned dolomite are filled into a converter, and the mass ratio of the lime to the molten iron in the converter is (3.8-4.5) to (206-208); the mass ratio of the light-burned dolomite to the molten iron in the converter is (1-1.5) to (206-208);
preferably, the second sublance oxygen blowing comprises: when the oxygen supply amount is 80% of the normal oxygen supply amount, light-burned dolomite is loaded in the converter, and the blowing is continued;
wherein the content of the first and second substances,the light-burned dolomite comprises the following components in percentage by mass: CaO 50-55%, MgO 38-42%, SiO21-5%, the balance being impurity elements;
the mass ratio of the light-burned dolomite to the molten iron in the converter is (2.6-2.8) to (206-208);
preferably, in the second lance-feeding oxygen supply blowing process, the temperature of molten iron in the converter is 1400-1500 ℃.
9. The method for removing titanium from molten iron in the converter according to claim 1 or 2, wherein tapping after completion of converter blowing comprises: after the converter blowing is finished, slag stopping and tapping are carried out; wherein the tapping temperature is 1643-1650 ℃.
10. The method for removing titanium from molten iron in a converter according to claim 1 or 2, wherein the steel slab obtained after tapping comprises, in mass percent: 0.0005 to 0.0006% of Ti.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010501955.0A CN111635973B (en) | 2020-06-04 | 2020-06-04 | Method for removing titanium from molten iron of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010501955.0A CN111635973B (en) | 2020-06-04 | 2020-06-04 | Method for removing titanium from molten iron of converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111635973A true CN111635973A (en) | 2020-09-08 |
| CN111635973B CN111635973B (en) | 2022-01-04 |
Family
ID=72328402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010501955.0A Active CN111635973B (en) | 2020-06-04 | 2020-06-04 | Method for removing titanium from molten iron of converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111635973B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112159884A (en) * | 2020-09-28 | 2021-01-01 | 首钢集团有限公司 | Method for removing titanium from molten iron |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864274A (en) * | 2012-09-18 | 2013-01-09 | 山西太钢不锈钢股份有限公司 | Method for producing silicon steel with converter |
| CN103540709A (en) * | 2013-11-06 | 2014-01-29 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling titanium of pure steel |
| CN103614508A (en) * | 2013-12-10 | 2014-03-05 | 首钢总公司 | Method for smelting high-titanium liquid iron by utilizing converter |
| CN103695589A (en) * | 2013-12-13 | 2014-04-02 | 河北省首钢迁安钢铁有限责任公司 | Method for removing titanium in molten iron |
| CN108384915A (en) * | 2018-03-07 | 2018-08-10 | 首钢集团有限公司 | A kind of removing titanium in molten iron method before State of Blast Furnace |
-
2020
- 2020-06-04 CN CN202010501955.0A patent/CN111635973B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864274A (en) * | 2012-09-18 | 2013-01-09 | 山西太钢不锈钢股份有限公司 | Method for producing silicon steel with converter |
| CN103540709A (en) * | 2013-11-06 | 2014-01-29 | 河北省首钢迁安钢铁有限责任公司 | Method for controlling titanium of pure steel |
| CN103614508A (en) * | 2013-12-10 | 2014-03-05 | 首钢总公司 | Method for smelting high-titanium liquid iron by utilizing converter |
| CN103695589A (en) * | 2013-12-13 | 2014-04-02 | 河北省首钢迁安钢铁有限责任公司 | Method for removing titanium in molten iron |
| CN108384915A (en) * | 2018-03-07 | 2018-08-10 | 首钢集团有限公司 | A kind of removing titanium in molten iron method before State of Blast Furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112159884A (en) * | 2020-09-28 | 2021-01-01 | 首钢集团有限公司 | Method for removing titanium from molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111635973B (en) | 2022-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102162019B (en) | Multistage combined pretreatment method for vanadium-bearing molten iron | |
| CN104250672B (en) | A kind of method of combined blown converter high efficiency dephosphorating | |
| CN108330245A (en) | A kind of high-purity smelting process of stainless steel | |
| CN103205524A (en) | Method for smelting low-sulfur steel from semi-steel | |
| CN112760550B (en) | Production method of nickel-free copper-phosphorus weathering steel casting blank | |
| CN113802045A (en) | Refining process of ultra-low carbon low aluminum steel | |
| CN111635973B (en) | Method for removing titanium from molten iron of converter | |
| CN113930575B (en) | Converter double-slag smelting method for high-silicon high-phosphorus molten iron | |
| CN115094299A (en) | Steelmaking production process of aluminum-containing cold forging steel | |
| JP2000073112A (en) | Dephosphorizing method of molten iron, and method for melting low-sulfur and low-phosphorus steel | |
| CN113215474A (en) | Method for regulating and controlling form of non-metallic inclusion in steel | |
| CN108118115B (en) | A kind of method of VD process smelting high carbon chromium bearing steel | |
| JP4790489B2 (en) | Converter steelmaking | |
| CN112322822A (en) | Converter single slag smelting method for low-silicon high-phosphorus molten iron | |
| CN112322958A (en) | Low-carbon aluminum-containing steel and smelting control method thereof | |
| CN108251598B (en) | Carbon increasing and nitrogen controlling production method of medium-carbon high-alloy steel | |
| JP2002266047A (en) | Ductile cast iron pipe and manufacturing method therefor | |
| CN114672718A (en) | Smelting method of high-grade silicon steel | |
| CN114045376A (en) | Method for desulfurizing molten steel in converter tapping process | |
| JP2002256320A (en) | Method for desiliconizing and dephosphorizing molten iron | |
| CN101161825A (en) | Novel process for steel-smelting | |
| CN113789425B (en) | Method for smelting return high silicon steel water by converter | |
| JP2607329B2 (en) | Hot metal dephosphorization method | |
| CN112442573B (en) | Molten iron pretreatment method for realizing desiliconization, dephosphorization and desulfurization in same container | |
| CN106702074B (en) | A kind of pole low phosphor and sulfur high-alloy steel list LF stove multiple tanks molten steel even pours method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |