CN113042720B - Molten iron inhibitor and preparation method and using method thereof - Google Patents

Molten iron inhibitor and preparation method and using method thereof Download PDF

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CN113042720B
CN113042720B CN202110202302.7A CN202110202302A CN113042720B CN 113042720 B CN113042720 B CN 113042720B CN 202110202302 A CN202110202302 A CN 202110202302A CN 113042720 B CN113042720 B CN 113042720B
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molten iron
ladle
inhibitor
iron
loading
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CN113042720A (en
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沙远洋
韩伟刚
丁旭
魏继东
冯学东
安钢
滕召杰
鲁俭
张建
王新刚
胡长庆
师学峰
张伟林
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North China University of Science and Technology
Shougang Jingtang United Iron and Steel Co Ltd
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North China University of Science and Technology
Shougang Jingtang United Iron and Steel Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention relates to a molten iron inhibitor and a preparation method and a using method thereof, belonging to the technical field of molten iron loading, wherein the inhibitor comprises the following components in parts by mass: SiO 22：60～90％，Al2O3：0％～30％，CaF2: 0 to 10% and the balance of inevitable impurities. The molten iron inhibitor provided by the invention has the advantages that molten iron does not surge, the molten iron inhibitor is safe and reliable, the service life of a ladle is prolonged by 58 ladles compared with the service life of the ladle in the prior art, and the service life is long.

Description

Molten iron inhibitor and preparation method and use method thereof
Technical Field
The invention belongs to the technical field of molten iron loading and transportation, and particularly relates to a molten iron inhibitor, and a preparation method and a use method thereof.
Background
The ladle is a storage and transportation container for high-temperature liquid molten iron widely used in iron and steel enterprises, and is generally built by refractory bricks or integrally cast by refractory materials. During the use of the foundry ladle, a certain amount of bonding substances are inevitably present on the surface and in the gaps of the refractory material of the foundry ladle due to the limitation of objective production conditions. When the ladle with the adhesive is used again after being baked, the molten iron in the ladle is violently turned over and gushed. At present, aiming at the problem of molten iron turning surge of a ladle, the cleaning of a bonding material of the ladle is generally enhanced, and although a certain inhibiting effect on the molten iron turning surge of the ladle can be achieved, the problems of the aspects of aggravation of damage of refractory materials, shortening of the service life of the ladle and the like can be caused.
Disclosure of Invention
The invention provides a molten iron inhibitor and a preparation method and a using method thereof, which aim to solve the problems of spewing and reducing the service life of a ladle in the process of loading and transporting molten iron in the prior art.
In one aspect, the invention provides a molten iron inhibitor, which comprises the following components in percentage by mass:
SiO2：60～90％，Al2O3：0％～30％，CaF2: 0 to 10% and the balance of inevitable impurities.
Further, the SiO2Is 80-85% of Al2O3The mass fraction of the CaF is 10-15 percent, and the CaF2The mass fraction of (A) is 0-5%.
Further, the inhibitor is composed of particles with different particle sizes, the range of the particle sizes of the particles with different particle sizes is less than or equal to 20mm, and the mass fraction of the particles with particle sizes of 0-5m is more than or equal to 80%.
In another aspect, the present invention provides a method for preparing the molten iron inhibitor, the method comprising,
mixing the raw materials to obtain the molten iron inhibitor; the raw materials comprise the following components in percentage by mass: SiO 22：60～90％，Al2O3：0％～30％，CaF2: 0 to 10% and the balance of unavoidable impurities.
In still another aspect, the present invention provides a method for using the molten iron inhibitor, which comprises,
obtaining an empty ladle;
adding the inhibitor into the emptied foundry ladle, and baking to the temperature of 300-1000 ℃;
and (3) using the baked foundry ladle for containing iron to inhibit the rolling of molten iron.
Further, the addition time of the inhibitor is within 60min from the beginning of the ladle emptying.
Furthermore, the adding mass of the inhibitor is 0.01-2kg/t molten iron.
Further, the capacity of the ladle is 50-600 tons.
Further, the iron loading is carried out m times, wherein in the first iron loading, the loading amount of the foundry ladle is less than or equal to 50% of the maximum capacity of the foundry ladle, the time interval of any two adjacent iron loading is 5-120min, and m is more than or equal to 2.
Further, the fuel used for baking is at least one of the following: blast furnace gas, coke oven gas, and converter gas.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the invention provides a molten iron inhibitor and a preparation method and a using method thereof, wherein the inhibitor rich in acidic oxides is added into a foundry ladle and then is roasted to form CaO-SiO with low alkalinity and low melting point2-Al2O3-FeO quaternary system slag mixture. During the process of packaging iron in molten iron and running, FeO in the mixture is reduced by carbon in the molten iron to produce CaO-SiO2-Al2O3The ternary system mixture still has lower melting point and better rheological property, and canSo as to provide good dynamic conditions for the continuous reaction of carbon in the molten iron and FeO in the mixture, thereby basically completing the reduction reaction in the process of filling iron in the ladle, avoiding the molten iron spewing in the running process after the ladle is full, and improving the safety and the environmental protection of the use of the ladle. The molten iron inhibitor provided by the invention has the advantages that molten iron does not surge, the molten iron inhibitor is safe and reliable, the service life of a ladle is prolonged by 58 ladles compared with the prior art, and the service life is long.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a process diagram of a method for using a molten iron inhibitor according to an embodiment of the present invention.
Detailed Description
The present invention will be specifically explained below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented thereby. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of 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 indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
on one hand, the embodiment of the invention provides a molten iron inhibitor, which comprises the following components in percentage by mass:
SiO2：60～90％，Al2O3：0％～30％，CaF2: 0 to 10% and the balance of unavoidable impurities.
The binder on the ladle is a mixture of pig iron, blast furnace slag, heat insulating agent, desulfurizing agent, desulfurized slag, refractory material, etc. and the product of mutual reaction between them, and the mixture is a mixture containing pig iron and made up by using CaO-SiO2The binary system is a mixture mainly, the alkalinity is as high as 4.0-8.0, the melting point is above 1800 ℃, and the temperature is far higher than the temperature of molten iron (the temperature of the molten iron in the ladle is 1400 ℃ C. and 1500 ℃ C.). The ladle with the adhesive needs to be baked before being put on line for use, pig iron in the mixture is oxidized in the baking process, and the resultant and the original adhesive form CaO-SiO2The FeO ternary system is a predominantly slag-like mixture which has a relatively low melting point compared to the initial bond and which will melt and flow during baking and accumulate at the ladle bottom. When the baked ladle is used for loading iron and running, the carbon in the molten iron and the baked CaO-SiO2FeO in the FeO ternary slag mixture is subjected to chemical reaction to generate carbon monoxide combustible gas and CaO-SiO with high melting point2The binary system substance hinders the continuation of the reaction, thereby prolonging the time of the reduction reaction and causing the continuous spewing of the molten iron in the ladle.
Adding the inhibitor rich in acid oxide into the foundry ladle and then baking to form CaO-SiO with low alkalinity and low melting point2-Al2O3-FeO quaternary system slag mixture. During the iron packaging and operation of the molten iron, FeO in the mixture is reduced by carbon in the molten iron to produce CaO-SiO2-Al2O3The ternary system mixture still has lower melting point and better rheological property, and can provide good dynamic conditions for the continuous reaction of carbon in molten iron and FeO in the mixture, so that the reduction reaction of the molten iron can be basically completed in the process of iron filling, and the running process after the molten iron is filled is avoidedThe molten iron is turned over and gushes, and the use safety and the environmental protection of the ladle are improved.
As an embodiment of the present invention, the SiO280-85% of the Al2O310-15% of the CaF2Is 0-5%.
As an embodiment of the invention, the inhibitor is composed of granules with different grain diameters, the grain diameter range of the granules with different grain diameters is less than or equal to 20mm, and the mass fraction of the granules with the grain diameters of 0-5m is more than or equal to 80%.
The particle size is controlled so that the particle size is not too large to improve the contact condition between the inhibitor and the binder, and the melting point of the binder is reduced by the solid-phase reaction product of the inhibitor and the binder, and the particle size is not too small to improve the field operation environment and reduce the dust emission.
In a second aspect, an embodiment of the present invention further provides a method for preparing the molten iron inhibitor, where the method includes,
mixing the raw materials to obtain the molten iron inhibitor; the raw materials comprise the following components in percentage by mass: SiO 22：60～90％，Al2O3：0％～30％，CaF2: 0 to 10% and the balance of inevitable impurities.
In a third aspect, an embodiment of the present invention further provides a method for using the molten iron inhibitor, which, with reference to fig. 1, includes,
s1, obtaining an emptied foundry ladle;
s2, adding the inhibitor into the emptied foundry ladle and baking the mixture to the temperature of 300-1000 ℃;
and S3, using the baked foundry ladle for containing iron to inhibit the rolling of molten iron.
As an implementation mode of the embodiment of the invention, the adding time of the inhibitor is 60min from the beginning of emptying the foundry ladle, and the adding mode is spraying or throwing.
After the ladle is emptied, a large amount of waste heat is left, and the inhibitor is added at the time to utilize the waste heat.
As an embodiment of the invention, the adding mass of the inhibitor is 0.01-2kg/t molten iron.
As an embodiment of the present invention, the charged amount of the ladle is 50 to 600 tons.
As an implementation of an embodiment of the present invention,
the iron loading is carried out m times, wherein in the first iron loading, the loading amount of the ladle is less than or equal to 50% of the maximum capacity of the ladle, the time interval of any two adjacent iron loading is 5-120min, and m is more than or equal to 2.
The purpose of adding molten iron for multiple times and controlling the time interval of any two times of adding molten iron is consistent, namely, more sufficient space and time are reserved to enable the bonding material and the molten iron to react to release most of gas, so that a large amount of gas cannot be generated to generate molten iron billowing after the ladle is filled. On the contrary, if the molten iron is filled in one step, the time is generally short, a large amount of gas is generated continuously after the molten iron is filled, and at the moment, the molten iron does not have enough space, so that the molten iron can be violently turned over and even splashed out, and serious safety accidents are caused.
As an implementation of the embodiment of the present invention, the fuel used for baking is at least one of the following: blast furnace gas, coke oven gas, and converter gas.
The hot metal inhibitor of the present invention, a method for preparing the same and a method for using the same will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
Embodiment 1 provides a molten iron inhibitor and a use method thereof, and specifically includes the following steps:
step 1, preparing a ladle spewing inhibitor according to a sampling analysis result of a plurality of binders generated in the online turnover process of 70t ladles, wherein the final chemical composition of the inhibitor is as follows: SiO 22：85.46％、Al2O37.82 percent of the total content of the components, and the balance of impurities, wherein the particle size is 0-20mm, and the proportion of the total content of the components with the particle size of 0-5mm is 93.26 percent.
And 2, immediately hoisting a certain ladle which is about to be offline to a charging position by using a crown block after the molten iron is emptied, and adding 50 kg of the inhibitor in the step 1 into the ladle in a manual charging mode. The total time from emptying the ladle to the full addition of inhibitor was 11 minutes.
And 3, according to actual production conditions and production rhythm requirements, before the ladle is put into use on line, adopting coke oven gas to bake for 37 hours, and measuring that the temperature of the inner material of the ladle reaches 850 ℃ after baking.
Step 4, the first iron loading process of the ladle for online use is divided into 2 stages: in the first stage, 20 tons of molten iron are charged, and the molten iron is continuously charged until the molten iron is full after 15 minutes.
Example 2
Embodiment 2 provides a molten iron inhibitor and a use method thereof, and specifically includes the following steps:
step 1, carrying out sampling analysis on a plurality of 180t ladles generated in the turnover process to prepare a ladle spewing inhibitor, wherein the final chemical composition of the inhibitor is as follows: SiO 2283.73％、Al2O38.28 percent of the total content of the active carbon, and the balance of impurities, wherein the particle size is 0-20mm, and the proportion of the total content of the particles with the particle size of 0-5mm is 92.04 percent.
And 2, immediately hoisting the 180-ton ladle to be off-line to a charging position by using a crown block after the molten iron is emptied, and adding 60 kilograms of inhibitor into the ladle through manual charging. The total time from emptying the ladle to the full addition of inhibitor was 14 minutes.
And 3, according to actual production conditions and production rhythm requirements, before the ladle is put into use on line, roasting for 37 hours by using coke oven gas, and measuring that the temperature of the inner material of the ladle reaches 880 ℃ when the roasting is finished.
Step 4, the first iron loading process of the ladle online again is divided into 2 stages: the first stage is filled with 50 tons of molten iron, and the charging of molten iron is continued after 25 minutes until full.
Example 3
Embodiment 3 provides a molten iron inhibitor and a use method thereof, and specifically includes the following steps:
step 1, carrying out sampling analysis on a plurality of bonding substances generated in the turnover process of 200t ladles to prepare a ladle spewing inhibitor, wherein the final chemical composition of the inhibitor is as follows: SiO 2286.31％、Al2O38.36 percent of the total weight of the particles, and the balance of impurities, wherein the particle size is 0-20mm, and the proportion of the particles accounting for the total weight is 90.12 percent within the range of 0-5 mm.
And 2, hoisting the 200-ton ladle to be off-line to a charging position by using a crown block immediately after the molten iron is emptied, and adding 80 kilograms of inhibitor into the ladle through manual charging. The total time from emptying the ladle to the complete addition of inhibitor was 22 minutes.
And 3, according to actual production conditions and production rhythm requirements, before the ladle is put into use on line, the ladle is baked for 37 hours by using coke oven gas, and the temperature of the inner material of the ladle reaches 950 ℃ when the baking is finished.
Step 4, the first iron loading process of the ladle for online use is divided into 3 stages: 50 tons of molten iron are charged in the first stage, 50 tons of molten iron are charged after 30 minutes, and the molten iron is continuously charged until the molten iron is full after 30 minutes.
Example 4
Embodiment 4 provides a molten iron inhibitor and a use method thereof, and specifically includes the following steps:
step 1, carrying out sampling analysis on bonding substances generated in the turnover process of a plurality of 300t ladles to prepare a ladle spewing inhibitor, wherein the final chemical composition of the inhibitor is as follows: SiO 2280.49％、Al2O311.52 percent of the total content of the active carbon, and the balance of impurities, wherein the particle size is 0-20mm, and the proportion of the total content of the particles with the particle size of 0-5mm is 89.74 percent.
And 2, immediately hoisting the 300 tons of ladle to be off-line to a charging position by using a crown block after the molten iron is emptied, and adding 100 kilograms of inhibitor into the ladle through a charging machine. The total time from emptying the ladle to the complete addition of inhibitor was 8 minutes.
And 3, according to actual production conditions and production rhythm requirements, before the ladle is put into use on line, the ladle is baked for 37 hours by using coke oven gas, and the temperature of the inner material of the ladle reaches 950 ℃ when the baking is finished.
Step 4, the first iron loading process of the ladle for online use is divided into 3 stages: the first stage is filled with 100 tons of molten iron, the molten iron is filled with 100 tons of molten iron after 40 minutes, and the molten iron is continuously filled until the molten iron is full after 40 minutes.
Comparative example 1
Comparative example 1 provides a method for suppressing the billowing of molten iron by using a conventional method for cleaning the binding, in which a ladle having a capacity of 300t was used and the billowing time of molten iron after cleaning by this method was 134 min.
TABLE 1
Numbering Molten iron turning-over time/min Service life/bag
Example 1 0 387
Example 2 0 526
Example 3 0 268
Example 4 0 231
Comparative example 1 134 192
The billowing time in the molten iron carrying processes of examples 1 to 4 and comparative example 1 was counted on-line, and the service life of the ladle was counted as shown in table 1.
As can be seen from Table 1, in the molten iron transferring process, the method of adding the molten iron inhibitor to the ladle was used in examples 1 to 4, the molten iron did not billow, and the service life of the ladle was long. Comparative example 1 is a conventional method of removing the sticking, which still involved the spewing of molten iron during the molten iron transportation, the spewing time was 134min, the safety was poor, and the service life of the ladle was 192 ladles. The ladle life of example 4 was increased by 58 ladles compared to comparative example 1, and the effect was better.
The invention provides a molten iron inhibitor and a preparation method and a using method thereof, wherein the inhibitor rich in acidic oxides is added into a foundry ladle and then is roasted to form CaO-SiO with low alkalinity and low melting point2-Al2O3-FeO quaternary system slag mixture. During the iron packaging and operation of the molten iron, FeO in the mixture is reduced by carbon in the molten iron to produce CaO-SiO2-Al2O3The ternary system mixture still has lower melting point and better rheological property, and can provide good dynamic conditions for the continuous reaction of carbon in molten iron and FeO in the mixture, so that the reduction reaction can be basically completed in the process of filling iron in the ladle, the molten iron spewing in the running process after the ladle is filled is avoided, and the use safety and the environmental protection of the ladle are improved. The molten iron inhibitor provided by the invention has the advantages that molten iron does not surge, the molten iron inhibitor is safe and reliable, the service life of a ladle is prolonged by 58 ladles compared with the prior art, and the service life is long.
It should be noted that, when the ladle capacities are not equal, the ladle life is not comparable, whereas example 4 is the same type of ladle in the same enterprise as comparative example 1, and the ladle life is comparable, and the ladle life is significantly longer than that of the conventional treatment method after the method of the present invention is adopted.
Finally, it should be further 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 the preferred embodiment and all changes and modifications that 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 (9)

1. The molten iron inhibitor is characterized by comprising the following components in percentage by mass:
SiO2：80-85%，Al2O3：10-15%，CaF2: 0-5% and the balance of unavoidable impurities.
2. The molten iron inhibitor according to claim 1, wherein the inhibitor is composed of granular substances with different particle sizes, the range of the particle sizes of the granular substances with different particle sizes is less than or equal to 20mm, and the mass fraction of the granular substances with the particle sizes of 0-5mm is more than or equal to 80%.
3. The manufacturing method of the molten iron inhibitor according to any one of claims 1 to 2, comprising,
mixing the raw materials to obtain the molten iron inhibitor; the raw materials comprise the following components in percentage by mass: SiO 22：80-85%，Al2O3：10-15%，CaF2: 0-5% and the balance of inevitable impurities.
4. The method for using the molten iron inhibitor according to any one of claims 1 to 2, wherein the method comprises,
obtaining an empty ladle;
adding the inhibitor into the emptied foundry ladle and baking the mixture to the temperature of 300-1000 ℃;
and the baked foundry ladle is used for containing iron so as to inhibit the rolling of molten iron.
5. The method for using the hot metal inhibitor according to claim 4, wherein the inhibitor is added within 60min from the beginning of the emptying of the ladle.
6. The use method of the molten iron inhibitor according to claim 4, wherein the mass of the inhibitor added is 0.01-2kg/t molten iron.
7. The method of using the molten iron inhibitor according to claim 4, wherein the ladle has a capacity of 50 to 600 tons.
8. The using method of the molten iron inhibitor as claimed in claim 4, wherein the iron loading is carried out m times, wherein in the first iron loading, the loading amount of the ladle is less than or equal to 50% of the maximum capacity of the ladle, and the time interval between any two adjacent iron loading is 5-120min, wherein m is greater than or equal to 2.
9. The use method of the molten iron inhibitor according to claim 4, wherein the fuel for baking is at least one of the following: blast furnace gas, coke oven gas, and converter gas.
CN202110202302.7A 2021-02-23 2021-02-23 Molten iron inhibitor and preparation method and using method thereof Active CN113042720B (en)

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GB1357602A (en) * 1970-08-26 1974-06-26 Martin & Pagenstecher Gmbh Ladle for steel or pig iron and a lining therefor
JPS51100931A (en) * 1975-03-03 1976-09-06 Aikoh Co TANDEITSUSHUNAIHEKINO YOTOHIMATSUFUCHAKUBOSHOSOSEIBUTSU
JPS5448623A (en) * 1977-09-27 1979-04-17 Daiichi Nenryo Kogyo Slag sedadive for converter use
JPS55161016A (en) * 1979-06-05 1980-12-15 Kawasaki Steel Corp Refining method for bottom blowing converter
JPH05140627A (en) * 1991-11-16 1993-06-08 Nippon Steel Corp Steelmaking method in converter
CN1955321A (en) * 2005-10-25 2007-05-02 上海盛宝钢铁冶金炉料有限公司 Molten steel carbon-free thermal insulation agent
CN101487069A (en) * 2008-01-18 2009-07-22 上海梅山钢铁股份有限公司 Foam slag inhibitor for converter
CN109468433A (en) * 2017-09-07 2019-03-15 株式会社Posco Fluxing agent and the molten iron method of refining for utilizing it

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JP2754146B2 (en) * 1993-11-22 1998-05-20 アイコー株式会社 Slag foaming inhibitor
CN102212639A (en) * 2011-05-24 2011-10-12 大石桥市荣源镁矿有限公司 Converter foamed slag pressing agent and using method thereof
CN105772652B (en) * 2016-03-23 2017-12-08 河南省西保冶材集团有限公司 Ladle furnace lining cleaner special and its application method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1357602A (en) * 1970-08-26 1974-06-26 Martin & Pagenstecher Gmbh Ladle for steel or pig iron and a lining therefor
JPS51100931A (en) * 1975-03-03 1976-09-06 Aikoh Co TANDEITSUSHUNAIHEKINO YOTOHIMATSUFUCHAKUBOSHOSOSEIBUTSU
JPS5448623A (en) * 1977-09-27 1979-04-17 Daiichi Nenryo Kogyo Slag sedadive for converter use
JPS55161016A (en) * 1979-06-05 1980-12-15 Kawasaki Steel Corp Refining method for bottom blowing converter
JPH05140627A (en) * 1991-11-16 1993-06-08 Nippon Steel Corp Steelmaking method in converter
CN1955321A (en) * 2005-10-25 2007-05-02 上海盛宝钢铁冶金炉料有限公司 Molten steel carbon-free thermal insulation agent
CN101487069A (en) * 2008-01-18 2009-07-22 上海梅山钢铁股份有限公司 Foam slag inhibitor for converter
CN109468433A (en) * 2017-09-07 2019-03-15 株式会社Posco Fluxing agent and the molten iron method of refining for utilizing it

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