KR101516623B1 - Method for predicting thickness of slag - Google Patents

Method for predicting thickness of slag Download PDF

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Publication number
KR101516623B1
KR101516623B1 KR1020140096576A KR20140096576A KR101516623B1 KR 101516623 B1 KR101516623 B1 KR 101516623B1 KR 1020140096576 A KR1020140096576 A KR 1020140096576A KR 20140096576 A KR20140096576 A KR 20140096576A KR 101516623 B1 KR101516623 B1 KR 101516623B1
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KR
South Korea
Prior art keywords
slag
volume
ladle
molten steel
measuring
Prior art date
Application number
KR1020140096576A
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Korean (ko)
Inventor
최형근
김해곤
홍용의
Original Assignee
현대제철 주식회사
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Priority to KR1020140096576A priority Critical patent/KR101516623B1/en
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Publication of KR101516623B1 publication Critical patent/KR101516623B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/505—Rings, inserts or other means preventing external nozzle erosion by the slag
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4646—Cooling arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
    • G01B21/085—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness using thermal means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

According to the present invention, there is provided a method of manufacturing a steel slag, comprising the steps of: measuring a volume inside a ladle; transferring the molten steel and the slag from the converter accommodating the molten steel and slag to the ladle and measuring the weight of the molten steel; Measuring the volume of the free board of the ladle and the surface area of the upper portion of the slag, calculating the volume of the molten steel from the measured weight of the molten steel, measuring the volume of the measured ladle, And calculating the volume of the slag from the calculated volume of the molten steel and calculating the thickness of the slag from the calculated volume of the slag and the measured cross-sectional area of the slag. Method is provided.

Description

METHOD FOR PREDICTING THICKNESS OF SLAG

The present invention relates to a slag thickness prediction method.

The thickness of the ladle slag is a major factor that needs to be reflected in the tap determination at the LF (LADLE FURNACE) temperature rise, and therefore slag thickness prediction is essential for setting the LF temperature elevation condition. Such ladle slag is largely composed of burnt lime inserted during the ladle and slag discharged out of the furnace ladle. At this time, the amount of burnt lime can be measured, but it is difficult to measure the amount of slag flowing out. Depending on the number of times of use of the lances and the degree of cutting of darts, the outflow amount is different for each operation. Also, the volume of the inside of the ladle varies depending on the lifetime of the ladle. Without consideration of this effect, the slag thickness can not be known.

A related art is Korean Patent Laid-Open Publication No. 1994-0015459 (published on July 21, 1994, slag thickness measurement method).

According to an embodiment of the present invention, the volume of the molten steel and the volume occupied by the freeboard in the entire volume of the ladle are removed to predict the volume of the slag, and the cross-sectional area of the slag is measured, And a thickness of the slag can be calculated.

According to an embodiment of the present invention, there is provided a method for measuring the volume of a molten steel, comprising the steps of: measuring the volume inside the ladle; transferring the molten steel and slag from the molten steel and the slag receiving ladle to the molten steel and measuring the weight of the molten steel; Measuring the volume of the free board of the ladle accommodating the slag and the surface area of the upper portion of the slag, calculating the volume of the molten steel from the measured weight of the molten steel, measuring the volume of the measured ladle, Calculating the volume of the slag from the volume of the freeboard and the calculated volume of molten steel, and calculating the thickness of the slag from the calculated volume of the slag and the measured cross-sectional area of the slag A method for predicting slag thickness is provided.

The step of measuring the weight of the molten steel may measure the weight of the molten steel by measuring the weight of the reed before and after the molten steel is introduced.

The step of measuring the volume of the inside of the ladle may calculate the upper inner diameter, the lower inner diameter, and the inner ladle depth of the ladle using a laser distance measuring instrument.

The step of measuring the volume of the free board may be performed using a laser distance measuring instrument, wherein the upper inner diameter, the lower inner diameter, and the depth of the free board of the free board are calculated.

According to embodiments of the present invention, the volume of molten steel and the volume occupied by the freeboard in the entire volume of the ladle are removed to estimate the volume of the slag, the cross-sectional area of the slag is measured, The slag thickness can be calculated from the volume of the slag and the cross-sectional area of the slag.

1 is a process diagram showing a slag prediction method according to an embodiment of the present invention;
FIG. 2 illustrates calculation of the weight of molten steel in the slag prediction method according to one embodiment of the present invention. FIG.
Figure 3 illustrates measuring the volume inside the ladle of the slag prediction method according to one embodiment of the present invention.
Figure 4 illustrates measurement of the surface area of a slag according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a slag thickness predicting method according to the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like and corresponding elements, The description will be omitted.

The thickness of the slag formed on the upper portion of the molten steel accommodated in the ladle is a major factor that needs to be reflected when the molten steel is heated. Therefore, the prediction of the slag thickness is an indispensable requirement in setting the temperature increase condition in the ladle furnace (LF). Depending on the number of times of use of the lances and the degree of cutting of the darts, the flow rate of the slag may be different for each operation. In addition, the volume of the ladle varies depending on the service life of the ladle. Therefore, the accurate thickness of the slag can be obtained by considering the influence of the ladle.

1 is a process diagram illustrating a slag prediction method according to an embodiment of the present invention. The method of predicting slag thickness according to the present invention comprises the steps of measuring the internal volume of the ladle, measuring the weight of molten steel leading to the ladle in the converter, measuring the surface area of the slag top, measuring the volume of the freeboard, Calculating a volume of the slag using the value, and calculating the thickness of the slag therefrom.

That is, the volume of the entire ladle, the volume of the molten steel in the ladle inside the ladle accommodating the molten steel, and the volume of the freeboard in the ladle are calculated, and the volume of the molten steel and the volume of the freeboard are subtracted from the total volume of the ladle. The volume is calculated, and the volume of the calculated slag and the cross-sectional area of the slag accommodated in the ladle are measured to obtain the thickness of the slag.

3 is a diagram illustrating the measurement of the volume inside the ladle of the slag prediction method according to an embodiment of the present invention. 3, the volume of the inside of the ladle can be calculated by using the laser distance measuring instrument 100, the upper inner diameter B, the lower inner diameter A, and the depth C of the ladle inside the ladle. The upper inner diameter B and the lower inner diameter A of the ladle may be different from each other depending on the melting loss in the ladle so that the upper inner diameter B and the lower inner diameter A are all measured shall.

FIG. 2 is a diagram illustrating calculation of the weight of molten steel in the slag prediction method according to an embodiment of the present invention. Referring to FIG. As shown in Fig. 2, when the molten steel is introduced from the converter to the ladle, the weight of the molten steel stored in the ladle can be determined by measuring the weight of the molten steel before and after the molten steel is discharged. Once the weight of the molten steel is measured, the volume of the molten steel can be calculated by dividing the weight of the molten steel by the density of the molten steel. At this time, the density of the molten steel can be variously formed depending on the type of steel.

4 is a view showing the measurement of the surface area of the slag S according to an embodiment of the present invention. The height of the freeboard and the surface area of the slag S can be measured by using the laser distance measuring machine 100 on the ladle L containing the molten steel F and the slag S as shown in FIG. The freeboard volume can be calculated from the measured freeboard height and slag S surface area and the volume of the slag S can be measured from the volume of molten steel F calculated previously and the total volume inside the ladle L have.

Therefore, the diameter D of the slag surface is measured using the laser range finder 100, the surface area of the slag S is calculated therefrom, and the calculated surface area of the slag S and the calculated volume of the slug S are used The thickness of the slag S can be obtained. That is, the calculated volume of the slag S is divided by the surface area of the slag S to obtain the thickness of the slag S, which can be used at the time of raising the temperature of the molten steel F.

The present invention can predict the slag thickness inside the ladle by using a simple addition device and increase the temperature accuracy and efficiency by controlling the temperature increase condition of the ladle furnace from the predicted slag thickness for each heat.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

F: Molten steel
S: Slag
L: Ladle
100: Laser range finder

Claims (4)

Measuring the volume inside the ladle;
Transferring the molten steel and the slag from the converter housing the molten steel and slag to the ladle and measuring the weight of the molten steel;
Measuring the volume of the free board of the ladle in which the molten steel and the slag are accommodated and the surface area of the upper portion of the slag;
Calculating a volume of the molten steel from the measured weight of the molten steel and calculating a volume of the slag from the measured volume of the inner ladle, the measured volume of the freeboard, and the calculated volume of the molten steel; And
And calculating the slag thickness from the calculated volume of the slag and the measured cross-sectional area of the slag.
The method according to claim 1,
Wherein the step of measuring the weight of the molten steel comprises:
Wherein the weight of the molten steel is measured by measuring the weight of the ladle before and after the molten steel is discharged.
The method according to claim 1,
The step of measuring the volume inside the ladle comprises:
Wherein the upper inner diameter, lower inner diameter, and inner ladle depth of the ladle are calculated using a laser distance meter.
The method according to claim 1,
The step of measuring the volume of the freeboard may include:
Wherein an upper inner diameter, a lower inner diameter, and a depth of the freeboard of the freeboard are calculated using a laser distance meter.
KR1020140096576A 2014-07-29 2014-07-29 Method for predicting thickness of slag KR101516623B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108181203A (en) * 2017-12-19 2018-06-19 新疆八钢铁股份有限公司 A kind of blast furnace supplies assay method of the hot metal in steelmaking with the quantity of slag
KR20190126598A (en) * 2018-05-02 2019-11-12 한국지질자원연구원 Monitoring device capable of measuring the height of sediment and method of monitoring the height of sediment using the same
CN113828757A (en) * 2021-09-13 2021-12-24 海宁哈工我耀机器人有限公司 Method for accurately controlling quality of high-temperature molten iron in electrolytic aluminum anode casting

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010057306A (en) * 1999-12-21 2001-07-04 신현준 The estimate method of tundish weight on casting
JP2002523753A (en) * 1998-08-18 2002-07-30 ユーエスエックス エンジニアーズ アンド コンサルタンツ，インコーポレーテツド Measurement of material thickness
JP2003344142A (en) * 2002-05-24 2003-12-03 Jfe Steel Kk Method and apparatus for measuring level of molten metal and thickness of slag layer by means of microwave level gauge
KR20110018150A (en) * 2009-08-17 2011-02-23 주식회사 포스코 Furnace status estimation system of furnace with molten metal and method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002523753A (en) * 1998-08-18 2002-07-30 ユーエスエックス エンジニアーズ アンド コンサルタンツ，インコーポレーテツド Measurement of material thickness
KR20010057306A (en) * 1999-12-21 2001-07-04 신현준 The estimate method of tundish weight on casting
JP2003344142A (en) * 2002-05-24 2003-12-03 Jfe Steel Kk Method and apparatus for measuring level of molten metal and thickness of slag layer by means of microwave level gauge
KR20110018150A (en) * 2009-08-17 2011-02-23 주식회사 포스코 Furnace status estimation system of furnace with molten metal and method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108181203A (en) * 2017-12-19 2018-06-19 新疆八钢铁股份有限公司 A kind of blast furnace supplies assay method of the hot metal in steelmaking with the quantity of slag
KR20190126598A (en) * 2018-05-02 2019-11-12 한국지질자원연구원 Monitoring device capable of measuring the height of sediment and method of monitoring the height of sediment using the same
KR102108027B1 (en) 2018-05-02 2020-05-08 한국지질자원연구원 Monitoring device capable of measuring the height of sediment and method of monitoring the height of sediment using the same
CN113828757A (en) * 2021-09-13 2021-12-24 海宁哈工我耀机器人有限公司 Method for accurately controlling quality of high-temperature molten iron in electrolytic aluminum anode casting

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