KR101666058B1 - Refractory for installation producing alloy steel containing manganese and manufacturing method thereof - Google Patents

Abstract

More particularly, the present invention relates to a refractory for manganese-containing alloy steel production facility for improving the corrosion resistance and thermal stability of a refractory used in a production facility for an alloy steel containing manganese And a method for producing the same.
The refractory for producing manganese-containing alloy steel according to the embodiment of the present invention is a refractory for use in a facility for producing a manganese-containing alloy steel. The refractory for producing manganese-containing alloy steel is a refractory for producing manganese spinel by reacting with manganese ions contained in the manganese- An aggregate material having a spinel crystal structure; And a fine raw material filling the gap between the aggregate raw materials.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory for producing manganese-

More particularly, the present invention relates to a refractory for manganese-containing alloy steel production facility for improving the corrosion resistance and thermal stability of a refractory used in a production facility for an alloy steel containing manganese And a method for producing the same.

In recent years, the industry and academia have a high expectation and interest in producing manganese-containing metal products that exhibit excellent properties in extreme environments, and they are operating production facilities to produce high-manganese alloy products with high manganese content.

To this end, manganese metal is injected into the ladle when hot liquid metal refined in a converter is injected into the ladle, the components and characteristics are adjusted through secondary refining, and intermediate products such as slabs are manufactured through a performance facility , And the final product is produced through the rolling process.

However, when the manganese is alloyed in the above-described conventional processes, there is a problem that the manganese oxide slag in high temperature is combined with the manganese in the air and oxygen in the air to increase the chemical erosion of the refractory, thereby shortening the life of the refractory.

The refractory bricks used in the conventional steelmaking process facilities mainly use a magnesium-based basic refractory containing carbon. In order to achieve high erosion performance of the slag generated during the steelmaking process, manganese in manganese-containing refined steel is more easily formed of manganese oxide due to higher oxidation affinity than steel, High erosion occurs due to chemical reaction with refractory bricks constructed as slag of high temperature liquid phase. That is, a reaction solid such as (Mg, Mn) O is formed by the reaction between the manganese oxide slag and the magnesia, and the formed solid solution has a lower chemical resistance than the magnesia refractory and easily erodes due to erosion.

In addition, due to the high solubility of manganese oxide in the manganese oxide-containing slag, the magnesia refractory is dissolved into liquid slag and eroded, resulting in higher erosion than existing molten steel. As a result, the overall refractory life is degraded, resulting in a significant economic loss to the operating process.

In addition, in general, when high-temperature molten steel is contained in a steelmaking plant, thermal expansion of the refractory material occurs, thereby causing structural spalling and deformation of the inside of the refractory material, thereby lowering the lifetime of the equipment . This is a unique characteristic of the refractory, which is caused by sintering and refining of the refractory material by heat, or physical properties such as expansion by the reaction product inside the refractory material. Therefore, it is required to design refractories and raw materials having high corrosion resistance to manganese oxide-containing slag and to develop refractories having appropriate physico-chemical properties for the equipment.

KR 10-0931157 B1 KR 10-0244734 B1

The present invention provides a refractory for a manganese-containing alloy steel production facility capable of forming a manganese spinel having excellent refractory properties by reacting with manganese ions contained in manganese-containing alloy steels, and a method for producing the same.

The present invention also provides a refractory for a manganese-containing alloy steel production facility capable of improving the corrosion resistance and thermal stability of a refractory used in a production facility for an alloy steel containing manganese, and a method for producing the same.

The refractory for a manganese-containing alloy steel production facility according to an embodiment of the present invention,

A refractory material used in a facility for producing manganese-containing alloy steel, comprising: an aggregate material having a spinel crystal structure for reacting with manganese ions contained in the manganese-containing alloy steel to form manganese spinel; And a fine raw material filling the gap between the aggregate raw materials.

The aggregate material has a formula of AB ₂ O ₄ , and among the constituent elements of the above formula, A is magnesium, manganese, iron, zinc, copper, nickel, And at least one divalent cation metal selected from titanium (Ti), wherein B is at least one element selected from the group consisting of Al, Mn, Fe, Cr, V, At least one trivalent cation metal selected from among the constituent elements of the above formula, and O may include divalent anionic oxygen.

The aggregate material may be contained in an amount of 50 to 75% by weight based on the total weight% of the mixture, and the fine granular material may be included in an amount of 25 to 50% by weight based on the total weight% of the mixture.

The fine grain raw material may include a raw material having a spinel crystal structure.

The fine grain raw material may include at least 50 wt% of a raw material having a spinel crystal structure based on the total weight percent of the fine grain raw material.

The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ ), and the porosity of the refractory obtained by calcining the mixture may have a value of 8 to 15%.

The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ ), and the coefficient of hot expansion of the refractory obtained by calcining the mixture may have a value of 0.8 to 2% at 1500 ° C.

The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ ), and the residual rate of linear change at 1500 ° C. of the refractory product obtained by calcining the mixture may have a value of -0.05 to 0.2%.

Further, a method of manufacturing a refractory for a manganese-containing alloy steel production facility according to an embodiment of the present invention,

A process for producing a refractory for use in an apparatus for producing manganese-containing alloy steel, comprising the steps of: preparing an aggregate material having a spinel crystal structure for forming manganese spinel by reacting with manganese ions contained in the manganese- Preparing a fine raw material for filling voids between the aggregate raw materials; Mixing the aggregate raw material and the fine raw material to prepare a mixture; Pressure-molding the mixture; And firing the mixture.

The prepared aggregate raw material has a particle size of 1 mm or more, and the prepared fine raw material may have a particle size of 1 mm or less.

The calcining of the mixture may be performed at a temperature of 1200 to 1800 캜 for 10 to 30 hours.

According to the refractory for a manganese-containing alloy steel production facility and the method for producing the same according to the embodiment of the present invention, a raw material having a spinel crystal structure which forms manganese spinel which reacts with manganese ions contained in manganese- By manufacturing the refractory, corrosion resistance and thermal stability can be remarkably improved.

Further, according to the refractory for manganese-containing alloy steel production facility according to the embodiment of the present invention and the method for producing the same, it is possible to effectively protect the manganese-containing production facility, and the service life can be remarkably improved as compared with existing refractories. When it is used in a manganese-containing production facility, it can eliminate equipment deformation and structural stress that occur during use, and can operate the equipment stably.

1 is a photograph showing the surface microstructure of magnesia particles reacting with manganese element.
2 is a photograph showing a surface microstructure in which manganese-containing alloy steel reacts with refractory bricks at a high temperature.
3 is a photograph showing the surface microstructure of particles having a spinel crystal structure reacted with manganese element.
4 is a graph showing the results of erosion test of refractories according to the content of a raw material having a spinel crystal structure.
FIG. 5 is a graph showing the experimental results of the thermal linear expansion coefficient of the refractory material according to the content of the raw material having the spinel crystal structure. FIG.
6 is a flow chart showing a method of manufacturing a refractory for a manganese-containing alloy steel production facility according to an embodiment of the present invention.

The refractory for producing manganese-containing alloy steel according to the present invention and the method for producing the same provide technical features that can improve the corrosion resistance and thermal stability of the refractory used in the production facility of alloy steel containing manganese.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Wherein like reference numerals refer to like elements throughout.

The refractory for producing manganese-containing alloy steel according to the embodiment of the present invention is a refractory for use in a facility for producing a manganese-containing alloy steel. The refractory for producing manganese-containing alloy steel is a refractory for producing manganese spinel by reacting with manganese ions contained in the manganese- An aggregate material having a spinel crystal structure; And a fine raw material filling the gap between the aggregate raw materials.

The aggregate material has a formula of AB ₂ O ₄ , and among the constituent elements of the above formula, A is at least one element selected from the group consisting of magnesium (Mg), manganese (Mn), iron (Fe), zinc (Zn) Ni, and Ti; and B is at least one element selected from the group consisting of aluminum (Al), manganese (Mn), iron (Fe), chromium (Cr), vanadium V), and O of the constituent elements of the above formula may include divalent anionic oxygen. That is, A includes one of divalent cation metals, or one of divalent cationic metals such as (Fe _x , Mn _{1 -x} ), (Mg _x , Mn _{1 -x} ), (Mg _x , Fe _{1 -x} ) And B may also include two or more of the trivalent cationic metals such as (Fe _x , Mn _{1 -x} ), and the like.

Here, the spinel crystal structure refers to a crystal structure represented by an oxide of AB ₂ O ₄ , and refers to a structure in which oxygen ions form a face-centered cubic lattice and A and B ions enter therebetween. Further, manganese spinel means a compound containing manganese among the compounds having a spinel crystal structure.

Hereinafter, the process of forming manganese spinel by reacting with manganese ions contained in the manganese-containing alloy steel in connection with the refractory for manganese-containing alloy steel production equipment according to an embodiment of the present invention will be described in detail with reference to the examples and the drawings.

1 is a photograph showing the surface microstructure of magnesia particles reacting with manganese element.

Generally, refractory bricks used in steelmaking process facilities are mainly made of magnesium (MgO) base refractory containing carbon (C), which realizes high corrosion resistance to slag generated during the steelmaking process .

However, in the refining process of the alloy steel containing manganese (Mn), the manganese oxide becomes easier to form the manganese oxide (MnO) due to the higher oxidation affinity than the steel, and the manganese oxide thus formed has high- Erosion easily occurs due to chemical reaction with the firebricks built thereon. The chemical reaction formula is as follows.

Mn (l) + 1/2 O ₂ (g) MnO (1)

MnO (l) + MgO (s)? (Mn, Mg) O (s or l)

(Mn · Mg) O solid solution is formed through the reaction between the slag of manganese oxide and magnesia as shown in the above reaction formula. The solid solution formed at this time has lower chemical resistance than the refractory containing magnesia and generates tensile stress from the surface as shown in Fig.

In addition, as shown in FIG. 1, due to the high MgO saturation solubility of the manganese oxide slag, the refractory containing the magnesia is dissolved in the low-viscosity and low-melting point liquid slag, And it has high erosion property. As a result, the entire life of the refractory is lowered, and this causes an enormous economic loss in the operating process.

In order to solve these problems, an experiment was conducted on the chemical interaction in which the manganese-containing alloy steel reacts with the refractory. In the above experiment, six kinds of refractory bricks used in the conventional steel making and steel making processes were selected. The chemical composition of the selected refractory bricks is shown in Table 1 below.

The refractory bricks were each refractory bricks produced from a refractory supplier using a commercial manufacturing process. The refractory bricks were processed into a crucible by taking in the inside of the refractory brick with a diameter of 50 mm. Then, alloyed steel containing 50% or more of manganese metal was placed in the refractory bricks thus processed, melted in an induction furnace, maintained at a high temperature of 1550 DEG C for 10 hours under atmospheric pressure, and then cooled to obtain manganese- The chemical interactions between bricks were evaluated.

As shown in Table 1, the corrosion resistance test for manganese oxide slag and the reactivity test with manganese-containing molten alloy steel showed that refractory brick 1, refractory brick 2 and refractory brick 6 had higher corrosion resistance and lower reactivity than the other refractory bricks, It was evaluated to have excellent chemical properties.

Based on the results of the above tests, three types of refractory bricks were manufactured from refractory bricks 1, refractory bricks 2 and refractory bricks 6, and basic properties such as specific gravity, porosity and elastic modulus for the comparison of the thermal characteristics of refractories and 1500 The thermal expansion coefficient and the spalling performance were investigated.

As a result of the test, refractory bricks 2 and refractory bricks 6 except refractory brick 1 showed excellent thermal expansion and spalling properties. However, when refractory brick 6 is applied to a plant for producing low-carbon alloy steel as refractory containing carbon (C), the carbon contained in the refractory flows into the molten steel and degrades the quality of the produced steel.

FIG. 2 is a photograph showing the surface microstructure in which the manganese-containing alloy steel reacts with the refractory brick at a high temperature.

Referring to FIG. 2, a chemical reaction formula in which a denatured layer is formed by a reaction between a molten manganese-containing alloy steel and a refractory is as follows.

First, the reaction of the manganese-containing alloy steel (FeMn)

_{Mn (l) + 1/2 O 2} → MnO (l, slag)

MgO (s, refractory) + MnO- (Mg, Mn) O (s)

Second, the refractory reaction after formation of inclusions by dissolved oxygen,

^{Mn (l) + O 2 -} → MnO (l, slag)

MgO (s, refractory) + MnO- (Mg, Mn) O (s)

Third, the reaction due to atomic diffusion at the refractory interface,

^{Mn 2 + ↔ Mg 2 +:} Diff. to be.

Here, the reaction of the manganese-containing alloy steel on the bath surface and the refractory reaction after formation of the inclusions by dissolved oxygen exist as inclusions in the molten steel after the formation of manganese oxide by oxidation, and most of them are floated as slag and the reaction between the slag layer and the refractory It affects. In the case of the reaction by the atom diffusion at the refractory interface, the solid solution of (Mg _x , Mn _{1 -x} ) O is formed by atom diffusion at the interface between the refractory and the molten steel, And gradually decreases in the depth direction. With the solid solution thus formed, the refractory is eroded by the following process.

First, the decision on the since manganese ion (Mn ^{2 +)} radius of magnesium ion in size by about 17% compared to the radius of the (Mg ^{2 +)} of as a manganese ion is substituted by the crystal lattice of magnesium oxide (Mn _rich, Mg) O The lattice expansion occurs, thereby causing a tensile stress in the crystalline aggregate in the refractory matrix to generate a crack.

Second, after the cracks are generated on the aggregate surface as described above, the low melting point slag penetrates into the cracks, and is separated into particles in the aggregate in the refractory base, thereby being molten.

The above reactions are reactions occurring in refractory aggregates made of magnesia. That is, the refractory of the magnesia system is highly erosion-resistant to manganese-containing alloy steel and manganese oxide slag at high temperature.

However, as a result of observing the microstructure of the other part of the interior of the refractory brick 2 (shown as a red circle in Fig. 2), it was found that manganese ions did not penetrate into the surface of the crystal grains in which the magnesia and alumina formed the spinel crystal structure I could. These microstructures were analyzed and the following chemical reaction equations were identified.

First, when the manganese ion coexists with the magnesium ion of the spinel crystal lattice structure,

Diff. (Coexistence) Mn ^{2 +} ↔ MgAl ₂ O ₄

Mn ^{2 +} + MgAl ₂ O ₄ ? (Mn _x , Mg _{1 -x} ) Al ₂ O ₄ , (x <0.17)

Secondly, when the manganese ion is substituted with the magnesium ion of the spinel crystal lattice structure,

Diff. (Substituted) Mn ^{2 +} ↔ Mg ^{2 +}

Mn ^{2 +} + MgAl ₂ O ₄ ? MnAl ₂ O ₄ .

3 is a photograph showing the surface microstructure of a particle having a spinel crystal structure reacted with a manganese element.

Referring to FIG. 3, when manganese ions enter the spinel crystal lattice as in the first case, the manganese ions coexist with the magnesium ions contained in the magnesium-aluminum oxide (MgAl ₂ O ₄ ) having a spinel crystal lattice do. However, as a result of crystallographic and precision analysis, manganese ions and iron ions or their oxides contained in the manganese-containing alloy steel reacted on the surface of magnesium-aluminum oxide (MgAl ₂ O ₄ ) to form MnFe ₂ O ₄ (Mn-Ferrite) manganese spinel, so that the solubility of the manganese ions in the crystal becomes less than 17%, and the structure can not receive a larger amount of manganese ions.

In addition, as in the second case, due to the substitution between magnesium ions and manganese ions due to defects in the crystal, the manganese ions may penetrate to change the component. However, the manganese spinel reacted with MnAl ₂ O ₄ It has the same crystal structure as Galaxite, and has an improved fire resistance property than MgAl ₂ O ₄ having a spinel crystal structure. Therefore, in both cases where manganese ions coexist or substitute in the spinel crystal structure, the refractory after the reaction will contain manganese spinel.

Thus, even if the manganese ions permeate into the spinel crystal structure, the crystallinity of the spinel crystal grains is low, so that it is difficult to form a reaction layer, and even if a reaction layer is formed, a reaction layer having a high refractivity on the surface can be formed . According to the above experimental results, it was found that refractories excellent in corrosion resistance and thermal stability to the high-erosive manganese oxide slag can be manufactured by using the raw material having the spinel crystal structure, and indirectly confirming the service life of the refractory The experiment was carried out for the refractory revolving erosion.

FIG. 4 is a graph showing the results of erosion test of refractories according to the content of a raw material having a spinel crystal structure, and FIG. 5 is a graph showing experimental results of the thermal linear expansion coefficient of refractories according to the content of a raw material having a spinel crystal structure.

Here, refractory bricks made by adding refractory bricks mainly made of magnesia as a main material and raw materials having a spinel crystal structure gradually were manufactured by using a commercial refractory manufacturing facility, and the relative erosion rate was measured. A raw material having a spinel crystal structure It was confirmed that the refractory bricks added with many were excellent in the relative erosion rate and the thermal expansion coefficient, indicating high corrosion resistance. Through the evaluation of the corrosion resistance, it was found that the refractory formed from the raw material having the spinel crystal structure can secure a high lifetime when used in the manganese-containing alloy steel facility. In the above description, the case where the magnesium-aluminum oxide (MgAl ₂ O ₄ ) having a spinel crystal structure reacts with the manganese ion has been described as an example. However, the divalent cation metal, the trivalent cation metal and the divalent anion oxygen ₂ &gt; O &lt; _{4 &} gt ;.

In the refractory for manganese-containing alloy steel production equipment according to the embodiment of the present invention, the aggregate material has a spinel crystal structure for reacting with manganese ions contained in the manganese-containing steel to form manganese spinel, Fill the voids. That is, the refractory for manganese-containing alloy steel production equipment is formed by sintering or sintering a mixture containing the aggregate material and the fine raw material, and for the dense structure of the refractory formed at this time, the aggregate material is 50 To 75% by weight, and the fine raw material may be contained in an amount of 25 to 50% by weight based on the total weight% of the mixture.

The aggregate material may be magnesium-aluminum oxide (MgAl ₂ O ₄ ) having a particle size of 1 mm or more, that is, 1 to 10 mm and having a spinel crystal structure, which is cheaper than the raw material having a spinel crystal structure And it is economical to have excellent performance. The aggregate material may be a mono-crystalline fused aggregate material having a spinel crystal structure or a sintered aggregate material obtained by reaction sintering at a high temperature. In the case of a refractory material in which the alumina material and the magnesia material are simply mixed It is possible to form an in-situ reacted spinel in a high temperature service temperature, and thus it can be used as a raw material having a spinel crystal structure.

The fine raw material may have a particle size of 1 mm or less, that is, 0.1 to 1 mm, and the fine raw material may also be a raw material having a spinel crystal structure like the aggregate raw material. When the fine raw material has a spinel crystal structure, manganese spinel can be formed more effectively by reacting with the manganese ion contained in the manganese-containing alloy steel. However, in order to improve the physical or mechanical properties of the produced refractory or improve the price competitiveness An alumina-based fine-particle raw material or a magnesia-based fine-particle raw material may be used. In the case of using the magnesia-based fine-particle raw material, the size of 1 μm or less should be avoided. This is because, when the surface energy of the magnesia fine particles is high, cracks may occur during drying of the refractories due to hydration.

Also, in the case of using the alumina-based fine particle raw material or the magnesia-based fine raw material, in order to react with the manganese ions contained in the manganese-containing alloy steel to form manganese spinel, the spinel crystal structure is set to 50 wt% It is preferable that the branch contains the raw material. Therefore, the content of the particles having the spinel structure included in the refractory for manganese-containing alloy steel production equipment according to the embodiment of the present invention can be 75 wt% or more, and in this case, it is effective to form manganese spinel by reacting with manganese ions to be.

Hereinafter, a method of manufacturing a refractory for a manganese-containing alloy steel production facility according to an embodiment of the present invention will be described in detail. Here, a description overlapping with the above description with respect to the manufacturing method will be omitted.

A method for producing a refractory for producing manganese-containing alloy steel according to an embodiment of the present invention is a method for producing a refractory for use in a plant for producing manganese-containing alloy steel, which comprises reacting manganese spinel with manganese ions contained in the manganese- (S100) of preparing an aggregate material having a spinel crystal structure for forming the aggregate material; (S200) of preparing a fine raw material for filling voids between the aggregate raw materials; (S300) of preparing a mixture by mixing the aggregate raw material and the fine raw material; A step of press-molding the mixture (S400); And firing the mixture (S500).

Here, the process of preparing the aggregate raw material (S100) and the process of preparing the fine raw material (S200) are not in a time-series relationship, and may be performed independently or simultaneously. In order to efficiently fill the gap between the raw materials of the aggregate, the aggregate raw material is a raw material having a particle size of 1 mm or more, preferably 1 to 10 mm, and the fine raw material is 1 mm or less, preferably 0.1 to 1 mm A raw material having a particle size can be used. With regard to the aggregate material and the fine raw material having the spinel crystal structure, the detailed description thereof is omitted above with respect to the refractory for the manganese-containing alloy steel production facility.

In the course of preparing the mixture by mixing the aggregate raw material and the fine raw material, an additive such as a binder may be further added for combining the raw materials. Such an additive may be an organic binder.

When the mixture is prepared, it is placed in a metal mold of a predetermined shape and uniaxial pressing is performed using a high-pressure press. At this time, the press-molded molded article can be visually inspected to check for an abnormality, and then heat-treated in a heating furnace. At this time, the heat treatment may be performed at about 100 to 300 ° C to remove additives such as water or a binder, and then the temperature may be raised and calcined at about 600 to 800 ° C to volatilize the organic binder.

Thereafter, the mixture is re-heated to sinter or sinter the mixture, and at this time, the sintering may be performed at a temperature of 1200 to 1800 ° C for 10 to 30 hours to improve the properties of the raw material having a spinel crystal structure. The firing temperature and firing time may vary depending on the type of raw material to be added and the molding conditions, and may vary depending on the heating furnace used.

Table 2 below is a table showing the components and physicochemical properties of the refractories prepared using the magnesium-alumina oxide (MgAl ₂ O ₄ ) having the spinel crystal structure as the aggregate raw material and the fine raw material. The produced refractory was prepared as a refractory brick by calcining a mixture containing the aggregate raw material and the fine raw material at a temperature of about 1780 DEG C for at least 20 hours in a tunnel kiln of 100 m length.

The refractory for manganese-containing alloy steel production equipment manufactured by the above process has physicochemical properties as shown in Table 2.

As can be seen from Table 2, the refractory for manganese-containing alloy steel production equipment according to the embodiment of the present invention is 12.36% having a porosity of 8 to 15% Satisfies the property.

The thermal expansion coefficient of the refractory at 1500 ° C is 1.2%, which is a value of 0.8 to 2%, the residual line change rate at 1500 ° C is 0.15%, which is a value of -0.05 to 0.2% The thermal expansion coefficient and the residual line change rate are low. Therefore, when used in a manganese alloy steel production facility, it is excellent in thermal stability and can fundamentally solve problems such as refractory spalling due to thermal expansion and equipment deformation.

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and the embodiments of the present invention and the described terminology are intended to be illustrative, It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

Claims (11)

As a refractory used in equipment for producing manganese-containing alloy steel,
An aggregate material having a spinel crystal structure for reacting with manganese ions contained in the manganese-containing alloy steel to form a manganese spinel made of a compound containing manganese; And
A refractory material for a manganese-containing alloy steel production facility, the refractory material being formed of a mixture containing a fine particle material filling voids between the aggregate materials.
The method according to claim 1,
The aggregate material has the formula AB ₂ O ₄ ,
Among the constituent elements of the above formula, A is at least one divalent cation selected from magnesium (Mg), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), nickel (Ni) Comprising a metal,
Among the constituent elements of the above formula, B includes at least one trivalent cation metal selected from aluminum (Al), manganese (Mn), iron (Fe), chromium (Cr) and vanadium (V)
A refractory for a manganese-containing alloy steel production facility wherein O among the constituent elements of the above formula includes divalent anionic oxygen.
The method according to claim 1,
The aggregate raw material is contained in an amount of 50 to 75% by weight based on the total weight% of the mixture,
The refractory for manganese-containing alloy steel production equipment according to claim 1, wherein the fine-grained raw material is contained in an amount of 25 to 50% by weight based on the total weight of the mixture.
The method according to claim 1,
The refractory for a manganese-containing alloy steel production facility comprising a raw material having a spinel crystal structure.
The method of claim 4,
The refractory for manganese-containing alloy steel production equipment according to claim 1, wherein the fine-grained material comprises at least 50 wt% of a raw material having a spinel crystal structure based on the total weight percent of the fine-grained raw material.
The method according to claim 1,
The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ )
A refractory for a manganese-containing alloy steel production facility having a porosity of 8 to 15% of a refractory obtained by firing the mixture.
The method according to claim 1,
The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ )
A refractory for a manganese-containing alloy steel production facility having a hot linear expansion coefficient at 1500 DEG C of 0.8 to 2%.
The method according to claim 1,
The aggregate raw material and the fine raw material include magnesium-aluminum oxide (MgAl ₂ O ₄ )
The refractory for a manganese-containing alloy steel production facility having a residual line change ratio at a temperature of 1500 캜 of -0.05 to 0.2%.
A method for producing a refractory for use in a facility for producing manganese-containing alloy steel,
Providing a raw material of aggregate having a spinel crystal structure for forming manganese spinel made of a compound containing manganese by reacting with manganese ions contained in the manganese-containing alloy steel;
Preparing a fine raw material for filling voids between the aggregate raw materials;
Mixing the aggregate raw material and the fine raw material to prepare a mixture;
Pressure-molding the mixture; And
And a step of firing the mixture. The method for producing a refractory for a manganese-containing alloy steel production facility,
The method of claim 9,
The aggregate material has a particle size of 1 mm or more,
Wherein the finely divided raw material has a particle size of 1 mm or less.
The method of claim 9,
Wherein the step of calcining the mixture comprises calcining the mixture at a temperature of 1200 to 1800 캜 for 10 to 30 hours.

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