CN110484684B - Ladle slag skimming method - Google Patents
Ladle slag skimming method Download PDFInfo
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- CN110484684B CN110484684B CN201910868118.9A CN201910868118A CN110484684B CN 110484684 B CN110484684 B CN 110484684B CN 201910868118 A CN201910868118 A CN 201910868118A CN 110484684 B CN110484684 B CN 110484684B
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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
- C21C7/072—Treatment with gases
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The embodiment of the invention provides a ladle slag-off method, which comprises the following steps: removing iron slag in the ladle and on the rear ladle edge of the ladle by using a slag removing machine; controlling the slag blowing gun to extend out; opening the branch pipe on the first main pipe, and blowing air to the rear ladle edge of the ladle through the branch pipe on the first main pipe to enable the iron slag in the ladle to be far away from the rear ladle edge; opening the branch pipe on the second main pipe, and blowing air to the ladle nozzle direction of the ladle through the branch pipe on the second main pipe so as to drive the residual iron slag in the ladle to the ladle nozzle; and adopting the slag raking machine to rake the iron slag which is driven to the ladle nozzle. The invention solves the problems of high refractory material loss and large and unsafe subsequent smelting sulfur recovery amount caused by incomplete slag removal of the existing slag removing tool.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a ladle slag skimming method.
Background
The molten iron pretreatment is an important measure for realizing high efficiency, high quality, low consumption and low cost in converter production, particularly for molten iron desulphurization, because the molten iron desulphurization is a process with the lowest cost and the highest efficiency in a plurality of desulphurization processes of blast furnace desulphurization, converter desulphurization and refining desulphurization, steel plants generally adopt the molten iron desulphurization process, different steel plants adopt different desulphurization processes, and the KR (Kambarareactor, KR mechanical stirring method) stirring method and blowing method are mainly adopted.
With the increasing of product upgrading and production cost pressure, many steel plants are developing research and application of desulfurization, air blowing and slag removing processes. The main stream is blown with air to remove slag: the method comprises the following steps of blowing slag by using an iron ladle bottom blowing brick, blowing slag by using an iron ladle side blowing brick and blowing slag by using a slag blowing gun. However, the three processes all have the problems of high refractory material loss and unsafe property of the slag removing tool.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a ladle slag-off method, which solves the problems of high refractory material loss, incomplete slag-off, large subsequent smelting sulfur recovery amount and unsafe problems of the existing slag-off tool.
The application provides the following technical scheme through an embodiment:
a ladle slag skimming method comprises the following steps:
removing iron slag in the ladle and on the rear ladle edge of the ladle by using a slag removing machine; the slag blowing gun is controlled to extend out and comprises a gun body, the gun body is positioned above the ladle, the gun body is connected with a first main pipe and a second main pipe, the first main pipe and the second main pipe are transversely arranged relative to the ladle, and branch pipes are arranged on the first main pipe and the second main pipe; opening the branch pipe on the first main pipe, and blowing air to the rear ladle edge of the ladle through the branch pipe on the first main pipe to enable the iron slag in the ladle to be far away from the rear ladle edge; opening the branch pipe on the second main pipe, and blowing air to the ladle nozzle direction of the ladle through the branch pipe on the second main pipe so as to drive the residual iron slag in the ladle to the ladle nozzle; and adopting the slag raking machine to rake the iron slag which is driven to the ladle nozzle.
Preferably, the branch pipe on the first main pipe is flat, and the blowing of the gas to the rear ladle edge of the ladle includes:
and blowing a flat airflow to the rear ladle edge of the ladle through a flat branch pipe on the first main pipe.
Preferably, before opening the branch pipe on the second main pipe of the slag blowing gun, the method further comprises the following steps:
and adopting the slag raking machine to rake off the iron slag blown off from the rear ladle edge.
Preferably, the second main pipe is provided with three or more branch pipes, and the opening of the branch pipes on the second main pipe and the blowing of the air toward the ladle nozzle of the ladle through the branch pipes on the second main pipe drives the remaining slag in the ladle to the ladle nozzle includes:
blowing air through two branch pipes on the outermost side of the second main pipe, wherein the blowing directions of the two branch pipes form an acute angle with the middle part of the second main pipe; and swinging the gun body to the ladle nozzle in the process of blowing through the branch pipe on the second main pipe so as to converge the iron slag in the ladle to the ladle nozzle.
Preferably, the acute angle is 70 ° to 80 °.
Preferably, the swinging angle of the gun body is-7.5 to 7.5 degrees relative to the vertical direction.
Preferably, the airflow flow of the first main pipe is 20-70 Nm3H; the airflow flow of the second main pipe is 60-200 Nm3/h。
Preferably, the removing time of the slag removing machine for removing the slag in the ladle and the slag on the rear ladle edge of the ladle is as follows: 2-3 minutes.
Preferably, the step of adopting the slag raking machine to rake off the iron slag which is driven to the ladle nozzle comprises the following steps:
when the molten iron steel grade during slag skimming is a common steel grade, removing the iron slag at the ladle nozzle by using the slag skimming machine until the bright surface is more than or equal to 80 percent; when the molten iron steel grade during slag skimming is low-sulfur steel grade, a slag skimming machine is adopted to remove the iron slag at the ladle nozzle until the bright surface is more than or equal to 90 percent; when the molten iron steel type during slag skimming is the extremely low-sulfur steel type, a slag skimming machine is adopted to remove the iron slag at the ladle nozzle until the bright surface is more than or equal to 97 percent; wherein the bright surface is the proportion of the exposed surface of the molten iron.
Preferably, the blowing working pressure of the branch pipes on the first main pipe and the branch pipes on the second main pipe is 0.4-0.6 Mpa.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages:
according to the ladle slag-raking method provided by the invention, most of the iron slag is raked by the slag-raking machine, and then the rear ladle edge is blown by using the branch pipe of the first main pipe, so that the separation of the iron slag and the ladle edge at the ladle edge part is realized, and the slag-raking is better facilitated. And finally, using a branch pipe on the second main pipe to blow air to drive the iron slag to a ladle nozzle for centralized removal. The branch pipe of the first person in charge through blowing the slag rifle and the branch pipe of the second person in charge blow the cooperation, guaranteed to take off more effectively the iron slag, the iron slag of avoiding back package edge is adhered to, carry out once more at package mouth department at last and concentrate the effectual efficiency that improves the slagging-off of taking off of iron slag, staged take off the iron slag can effectual improvement take off the slag effect, reduce follow-up smelting sulphur return volume, and blow the slag rifle can not direct and the molten iron contact at whole in-process, can improve the life of blowing the slag rifle, reduce cost improves and takes off the slag security.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a ladle slag-off method according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a working scene of a slag blowing gun to which a ladle slag-raking method according to a preferred embodiment of the present invention can be applied;
FIG. 3 is a schematic structural view of the second main pipe of the slag lance in the preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
First embodiment
Referring to fig. 1, the present embodiment provides a method for removing slag from a ladle, and in order to cooperate with the method, the present embodiment also provides a slag blowing gun.
Referring to fig. 2 and 3, the slag blowing lance 10 includes a lance body 11, the lance body 11 is located above the ladle 21, specifically, the lance body 11 may be vertically arranged with respect to the ladle 21, and the lance body 11 may swing at a certain angle, and the swing direction is the same as the rotation direction of the ladle 21. Specifically, the rifle body 11 is through desulfurization stirring head platform, has the support guider, and the rifle body 11 is scalable, for example: the expansion speed is 15m/min, and the installation angle is approximately consistent with the inclination angle of the ladle 21 during slag skimming. The lance body 11 is connected with a first main pipe 12 and a second main pipe 14, the first main pipe 12 and the second main pipe 14 are both transversely arranged relative to the ladle 21, and branch pipes are arranged on the first main pipe 12 and the second main pipe 14; the air flow is branched by the gun body 11 to reach the first main pipe 12 and the second main pipe 14, and finally is blown out through branch pipes arranged on the first main pipe 12 and the second main pipe 14 respectively, and the shape of the branch pipes can be flat.
Further, in order to make the slag removing method of the ladle 21 more effective and the air flow and pressure are easier to control, the following dimensions may be set: the effective internal diameter of the first main pipe 12 is 25mm, the effective internal diameter of the second main pipe 14 is 60mm, and the total number of branch pipes is 5. The first main pipe 12 is provided with a branch pipe which faces the rear ladle edge of the ladle 21 away from the ladle nozzle 22. The second main pipe 14 is provided with 4 branch pipes which are oriented in the direction of the ladle nozzle 22 of the ladle 21.
As shown in fig. 1, the ladle slag-off method in this embodiment includes:
step S10: removing iron slag in the ladle and on the rear ladle edge of the ladle by using a slag removing machine;
step S20: the slag blowing gun is controlled to extend out and comprises a gun body, the gun body is positioned above the ladle, the gun body is connected with a first main pipe and a second main pipe, the first main pipe and the second main pipe are transversely arranged relative to the ladle, and branch pipes are arranged on the first main pipe and the second main pipe;
step S30: opening the branch pipe on the first main pipe, and blowing air to the rear ladle edge of the ladle through the branch pipe on the first main pipe to enable the iron slag in the ladle to be far away from the rear ladle edge;
step S40: opening the branch pipe on the second main pipe, and blowing air to the ladle nozzle direction of the ladle through the branch pipe on the second main pipe so as to drive the residual iron slag in the ladle to the ladle nozzle;
step S50: and adopting the slag raking machine to rake the iron slag which is driven to the ladle nozzle.
In step S10, the main slag in the ladle 21 is removed, and the remaining slag is difficult to remove. When the slag removing machine is used for removing the slag, the iron slag on the ladle edge part is emphatically removed. The scraping time is 2-3 minutes, and the air flow is controlled to be 20-70 Nm3Finally, 60% to 80% of the iron slag can be removed in step S10.
Because the state of the iron slag is different along with the difference of slag components, the more common slag conditions of the iron slag after KR desulfurization are as follows: powdery/loose desulfurized slag, sticky slag/spherical desulfurized slag (difficult to remove), and normal desulfurized slag. Particularly, the control of the gas flow of the first main pipe 12 and the control of the removing time can be adjusted according to the slag condition of the iron slag. For example, when the amount of slime/globular desulfurization slag is large, the gas flow rate in the first main pipe 12 can be increased appropriately. In addition, the control of the gas flow and the control of the removing time of the first main pipe 12 can be adjusted according to different steel grades, for example, the removing time of the steel grade with lower sulfur content can be properly increased, and the gas flow can be properly increased; in addition, the control of the air flow of the first main pipe 12 can be gradually reduced with the increase of the scrabbling time.
In the steps S20-S30, the air is blown to the rear ladle edge, so that the iron slag on the ladle edge can be blown away from the ladle edge, and the slag is conveniently raked by the slag raking machine. Further, the branch pipe of the first main pipe 12 may be flat, and a flat airflow may be blown toward the rear ladle edge of the ladle 21 through the flat branch pipe (see the branch pipe 121 shown in fig. 2) of the first main pipe 12. The transverse area of the air blowing can be increased, and the air blowing effect is improved. A plurality of branch pipes may also be provided on the first main pipe 12 to blow air to the rear bag edge to improve the effect.
After the iron slag is blown off from the ladle edge, a slag removing machine can be used for removing the iron slag blown off from the ladle edge by the branch pipe on the first main pipe 12 or removing the iron slag to the position near the ladle nozzle 22 so as to prevent the iron slag from returning to the ladle edge again. The process generally lasts for 1 to 2 minutes.
In step S40, the branch pipe on the second main pipe 14 is opened after the upper branch pipe on the first main pipe 12 is opened, so that the ladle slag on the rear ladle edge can be raked to the ladle nozzle 22 to avoid the influence of the blowing of the branch pipe on the second main pipe 14. In step S30, the air flow rate of the second main pipe 14 may be 60-200 Nm3H is used as the reference value. The adjustment of the air flow of the second main pipe 14 can refer to the air flow condition of the first main pipe 12, and is not described in detail.
Further, the second main pipe 14 is provided with three or more branch pipes, for example, 3, 4, 6, etc. Blowing air to the ladle nozzle 22 direction of the ladle 21 to drive the iron slag to the vicinity of the ladle nozzle 22, comprising:
step S41: air is blown through the two outermost branch pipes on the second main pipe 14, and the blowing directions of the two branch pipes and the middle part of the second main pipe 14 form an acute angle. E.g., when the acute angle is a first angle. In particular, the first angle is 70 ° to 80 °, preferably 75 °, for example, the branch pipes 141, 144 in fig. 3 are both inclined (blown) towards the second main pipe 14, forming an acute angle α, β with the middle part of the second main pipe 14. If the number of legs on the secondary main pipe 14 is more than 4, the legs in the secondary outer layer may also form a second angle with the middle part of the secondary main pipe 14, the second angle being acute and slightly larger than the first angle, for example 80-90. The intermediate legs of the secondary main pipe 14 may also be angled at 90 ° to the secondary main pipe 14, for example, the legs 142, 143 in fig. 3 are angled at right angles to the secondary main pipe 14. The iron slag can be gathered by obliquely blowing through the branch pipe outside the second main pipe 14.
Step S42: and the gun body 11 is gradually swung to the ladle nozzle in the process of blowing air through the branch pipe on the second main pipe 14 so as to collect the iron slag in the ladle 21 to the ladle nozzle 22. At this time, the main iron slag is the molten iron surface scum. The swinging angle of the gun body 11 is + -7.5 degrees relative to the vertical direction, and the swinging direction is consistent with the rotating direction of the ladle 21.
When the iron slag is concentrated near the ladle nozzle 22, the step S50 may be performed to intensively remove the iron slag. The execution time of the steps S40-S50 is 2-3 minutes. It should be noted that steps S40 and S50 may be repeatedly executed without limitation of the number of times.
In step S50, the final pickoff effect should meet any one of the following criteria:
1. when the molten iron steel type during slag skimming is a common steel type, a slag skimming machine is used for skimming the iron slag near the ladle nozzle 22 until the bright surface is more than or equal to 80%, the surface of the molten iron is an iron slag mixture, the iron slag mixture needs to be skived after the desulfurization is finished, and in order to form the slag skimming effect, the exposed bright surface of the molten iron is used as an evaluation standard or the iron slag skimming rate. The bright surface is the ratio of the exposed surface of the molten iron.
2. When the molten iron steel grade during slag skimming is low-sulfur steel grade, a slag skimming machine is adopted to remove the iron slag near the ladle nozzle 22 until the bright surface is more than or equal to 90 percent;
3. when the molten iron steel type during slag skimming is the extremely low-sulfur steel type, a slag skimming machine is adopted to remove the iron slag near the ladle nozzle 22 until the bright surface is more than or equal to 97 percent.
In the embodiment of the present invention, in order to control the air supply on the first main pipe 12 and the second main pipe 14, control valves are respectively disposed at positions of the gun body 11 branched to the first main pipe 12 and the second main pipe 14, and the control of the control valves is the prior art and will not be described again. In addition, the blowing working pressure of the branch pipes on the first main pipe 12 and the branch pipes on the second main pipe 14 is 0.4-0.6Mpa, so that the slag blowing effect is ensured, and the danger caused by overlarge blowing pressure is avoided.
In the embodiment of the present invention, the slag blowing gun 10 should also be checked periodically, for example: the gun is blocked and no flow exists for serious burning loss or breakage; the joint is air-leakage and cannot be treated; the refractory material falls off and exposes the steel pipe, causes equipment deformation easily, can't blow trouble such as sediment operation, all needs to blow the sediment rifle 10 and change.
In a specific example, the average slag-raking time of the common varieties in the original process is 6.9min, the slag-raking time of the low-sulfur steel variety is 8.0min, and the slag-raking time of the extremely low-sulfur steel variety is 9.2min, which are respectively 5.1min, 5.7min and 6.9min after optimization; the sulfur return amount of the low-sulfur steel converter is reduced by 0.0012 percent; the resulfurization amount of the converter with the extremely-low sulfur steel is reduced by 0.0009%, and after the method is optimized, the slag removing time and the resulfurization amount of the converter are both obviously reduced to reach better levels, so that a direction is provided for the improvement of the molten iron slag removing process in the steel industry.
According to the ladle slag-raking method provided by the invention, most of the iron slag is raked by the slag-raking machine, and then the rear ladle edge is blown by using the branch pipe of the first main pipe, so that the separation of the iron slag and the ladle edge at the ladle edge part is realized, and the slag-raking is better facilitated. And finally, using a branch pipe on the second main pipe to blow air to drive the iron slag to a ladle nozzle for centralized removal. The branch pipe of the first person in charge through blowing the slag rifle and the branch pipe of the second person in charge blow the cooperation, guaranteed to the more effectual taking off of iron slag, the iron slag of avoiding back package edge adheres to, it can effectual improvement take off the slag quality to take off the iron slag stage by stage, concentrate at package mouth department and take off the effectual efficiency that improves of taking off the slag of iron slag to blow the slag rifle can not directly contact with the molten iron at whole in-process, can improve the life who blows the slag rifle, reduce cost improves and takes off the slag security.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A ladle slag-off method is characterized by comprising the following steps:
removing iron slag in the ladle and on the rear ladle edge of the ladle by using a slag removing machine;
the slag blowing gun is controlled to extend out and comprises a gun body, the gun body is positioned above the ladle, the gun body is connected with a first main pipe and a second main pipe, the first main pipe and the second main pipe are transversely arranged relative to the ladle, and branch pipes are arranged on the first main pipe and the second main pipe;
opening the branch pipe on the first main pipe, and blowing air to the rear ladle edge of the ladle through the branch pipe on the first main pipe to enable the iron slag in the ladle to be far away from the rear ladle edge;
opening the branch pipe on the second main pipe, blowing air to the ladle nozzle direction of the ladle through the branch pipe on the second main pipe, and gradually swinging the gun body to the ladle nozzle in the process of blowing air through the branch pipe on the second main pipe so as to drive the residual iron slag in the ladle to the ladle nozzle;
and adopting the slag raking machine to rake the iron slag which is driven to the ladle nozzle.
2. The method of claim 1, wherein the branch pipe on the first main pipe is flat, and the blowing of the gas to the ladle rim comprises:
and blowing a flat airflow to the rear ladle edge of the ladle through a flat branch pipe on the first main pipe.
3. The method of claim 1, wherein prior to opening the branch pipe on the second main pipe of the slag lance, further comprising:
and adopting the slag raking machine to rake off the iron slag blown off from the rear ladle edge.
4. The method of claim 1, wherein the second main pipe is provided with three or more branch pipes, and the step of opening the branch pipes of the second main pipe and blowing air toward the ladle nozzle of the ladle through the branch pipes of the second main pipe to drive the remaining slag in the ladle to the ladle nozzle comprises:
blowing air through two branch pipes on the outermost side of the second main pipe, wherein the blowing directions of the two branch pipes form an acute angle with the middle part of the second main pipe;
and gradually swinging the gun body to the ladle nozzle in the process of blowing through the branch pipe on the second main pipe so as to converge the iron slag in the ladle to the ladle nozzle.
5. The method of claim 4, wherein the acute angle is 70 ° -80 °.
6. The method of claim 4 wherein the angle of oscillation of the gun body is-7.5 ° to 7.5 ° from vertical.
7. The method according to claim 1, wherein the airflow rate of the first main pipe is 20-70 Nm3H; the airflow flow of the second main pipe is 60-200 Nm3/h。
8. The method according to claim 1, wherein the removal time for removing the slag in the ladle and at the ladle rear edge using the slag remover is: 2-3 minutes.
9. The method according to claim 1, wherein the step of using the slag raker to rake the iron slag caught at the ladle nozzle comprises:
when the molten iron steel grade during slag skimming is a common steel grade, removing the iron slag at the ladle nozzle by using the slag skimming machine until the bright surface is more than or equal to 80 percent;
when the molten iron steel grade during slag skimming is low-sulfur steel grade, a slag skimming machine is adopted to remove the iron slag at the ladle nozzle until the bright surface is more than or equal to 90 percent;
when the molten iron steel type during slag skimming is the extremely low-sulfur steel type, a slag skimming machine is adopted to remove the iron slag at the ladle nozzle until the bright surface is more than or equal to 97 percent;
wherein the bright surface is the proportion of the exposed surface of the molten iron.
10. A method according to any one of claims 1-9, characterised in that the working pressure of the blow air in the branch pipes on the first main pipe and in the branch pipes on the second main pipe is 0.4-0.6 Mpa.
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| FI843328A (en) * | 1983-08-26 | 1985-02-27 | Lenin Kohaszati Muvek | FOERFARANDE FOER FRAMSTAELLNING AV STAOL MED LAOG KOLHALT UNDER REGLERING AV KOLETS AENDPUNKT OCH SMAELTTEMPERATUR. |
| CN101403023A (en) * | 2008-11-06 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Ultra-deep desulfuration method for hot metal |
| CN102031339A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Molten iron slagging-off method |
| CN203360480U (en) * | 2013-07-26 | 2013-12-25 | 武汉钢铁(集团)公司 | Spray gun used for assisting slagging-off by blowing air at top during molten iron pretreatment |
| CN104328238A (en) * | 2014-10-15 | 2015-02-04 | 首钢总公司 | Converter smelting resulfurization amount control method |
| CN104831013A (en) * | 2015-05-28 | 2015-08-12 | 中冶赛迪工程技术股份有限公司 | Slag blow-removal mechanism |
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