KR101629242B1 - Manufacturing Method of ladle for transferring molten metal - Google Patents

Manufacturing Method of ladle for transferring molten metal Download PDF

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Publication number
KR101629242B1
KR101629242B1 KR1020150173741A KR20150173741A KR101629242B1 KR 101629242 B1 KR101629242 B1 KR 101629242B1 KR 1020150173741 A KR1020150173741 A KR 1020150173741A KR 20150173741 A KR20150173741 A KR 20150173741A KR 101629242 B1 KR101629242 B1 KR 101629242B1
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KR
South Korea
Prior art keywords
ladle
colloidal silica
wollastonite
water
molten metal
Prior art date
Application number
KR1020150173741A
Other languages
Korean (ko)
Inventor
이강학
문명욱
배성범
윤국희
Original Assignee
주식회사 동국알앤에스
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Priority to KR1020150173741A priority Critical patent/KR101629242B1/en
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Publication of KR101629242B1 publication Critical patent/KR101629242B1/en
Priority to JP2016180407A priority patent/JP6318208B2/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • B28B13/0275—Feeding a slurry or a ceramic slip
    • 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/004—Devices for shaping artificial aggregates from ceramic mixtures or from mixtures containing hydraulic binder
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/043—Alkaline-earth metal silicates, e.g. wollastonite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06—Aluminous cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • B28B2013/0265—Feeding a slurry or a ceramic slip

Abstract

The present invention relates to a ladle slurry manufacturing method comprising the steps of: preparing a ladle slurry for producing a ladle slurry by mixing wollastonite, alumina cement, colloidal silica and water; supplying a ladle slurry to a casting mold in the form of a ladle main body to cast a ladle main body; And a boron nitride layer coating step of coating a boron nitride layer on the surface of the fusing prevention layer, the method comprising the steps of: coating a surface of a cast ladle body with a fusing prevention layer;

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a manufacturing method of ladle for transferring molten metal,

The present invention relates to a molten metal transfer ladle used in molten metal transfer in a casting process line.

Generally, the ladles used in the casting process line are made of castings, have the advantage of being very resistant to high temperatures. However, since the molten metal transfer ladle is made of a casting, it is difficult to handle because it is heavy, and the heat conduction is high, so that heat loss is high. In addition, since the molten metal for transferring molten metal is fused to the surface of the ladle, the coating material must be frequently applied to the surface of the molten metal, thereby significantly lowering the workability.

An object of the present invention is to provide a method of manufacturing a ladle for transferring molten metal, which is light in weight using a ceramic composite material and reduced in melt adhesion of the molten metal on the surface.

A method for manufacturing a ladle for transferring molten metal according to the present invention comprises a ladle slurry production step of producing a ladle slurry by mixing wollastonite, alumina cement, colloidal silica and water, and a step of mixing the ladle slurry after inserting the inner mesh into a casting mold And a boron nitride layer coating step of coating a boron nitride layer on the surface of the anti-fusion layer, the anti-fusion layer coating step of coating the anti-fusion layer on the surface of the cast ladle body, .

The ladle slurry may be formed by mixing wollastonite and alumina cement to prepare a primary mixture, and mixing the primary mixture with colloidal silica and water.

The primary mixture is formed by mixing 80 to 97% by weight of the wollastonite with respect to 100% by weight of the total wollastolite and alumina cement, 3 to 20% by weight of the alumina cement, 20 to 50% by weight of water, and the water is mixed in an amount of 10 to 50 parts by weight based on the total weight of the primary mixture, and the water may be mixed in an amount of 1 to 30 parts by weight based on the total weight of the primary mixture have.

The colloidal silica is a solution in which 20 to 50 wt% of the colloidal silica is dispersed in water and is mixed in an amount of 25 to 40 parts by weight based on the total weight of the primary mixture, To 20 parts by weight.

The fusion preventive layer may be formed by coating a surface of the ladle body with a fusion preventive coating liquid in which wollastonite and colloidal silica are mixed and the wollastonite and colloidal silica are mixed with each other at a weight ratio of 1: 0.6 to 1.5 .

The inner mesh may be formed of a glass cloth, a carbon mesh, a steel mesh, or a basalt fiber mesh.

The method for manufacturing the ladle for transferring molten metal according to the present invention has the effect of reducing the weight of the ladle manufactured and making it easy to handle by manufacturing the ladle using the ceramic composite instead of the casting.

Further, the method for manufacturing a ladle for transferring molten metal according to the present invention has an effect of controlling the curing speed and strength of a ladle body cast by mixing alumina cement with ladle slurry.

Further, the method for manufacturing a ladle for transferring molten metal according to the present invention has the effect of reducing fusion bonding of the molten metal to the ladle surface by forming a fusion prevention layer on the surface of the ladle in contact with the molten metal.

1 is a process diagram of a method for manufacturing a ladle for transferring molten metal according to an embodiment of the present invention.
2 is a plan view of a ladle for transferring molten metal manufactured according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA of FIG.

 Hereinafter, a method for manufacturing a ladle for transferring molten metal according to an embodiment of the present invention will be described in detail.

First, a method for manufacturing a ladle for transferring molten metal according to an embodiment of the present invention will be described.

1 is a process diagram of a method for manufacturing a ladle for transferring molten metal according to an embodiment of the present invention. 2 is a plan view of a ladle for transferring molten metal manufactured according to an embodiment of the present invention. 3 is a cross-sectional view taken along line A-A of Fig.

1, a ladle slurry manufacturing step S10, a ladle main body casting step S20, a fusing prevention layer coating step S30, and a boron nitride coating step S30 are sequentially performed in accordance with an embodiment of the present invention. (S40).

The molten metal transfer ladle is formed by coating a fusing prevention layer and a boron nitride layer after the ladle body casted with ladle slurry is cured for a predetermined time. That is, the molten metal transfer ladle is formed by sequentially coating a fusing prevention layer and a boron nitride layer on the surface of the ladle body.

2 and 3, the molten metal transfer ladle 100 includes a ladle main body 110, an inner mesh 120, a steel band 130, and a coupling unit 140. The ladle body 110 has a hemispherical shape in which an upper portion is opened, and includes a molten metal discharge port 111 for discharging molten metal on one side. The inner mesh 120 is formed in a mesh network and is distributed throughout the ladle main body 110 to increase the strength and toughness of the ladle main body 110. The inner mesh 120 may be formed by overlapping or spacing a plurality of mesh meshes. The internal mesh 120 may be partially exposed to the inside or outside during the casting process. The inner mesh 120 may be formed of a glass cloth, a carbon mesh, a steel mesh, or a hollow fiber mesh. The steel band 130 is formed in a band shape and is positioned inside the ladle main body 110 to disperse the stress applied when the molten metal is supplied to the molten metal transfer ladle 100. The steel band 130 may be formed in a number of ways depending on the size and shape of the ladle body 110 and may be distributed in various directions in the ladle body 110. The coupling unit 140 is formed on the upper part of the ladle main body 110, and a transfer jig (not shown) is engaged in the process of transferring the molten metal. The coupling unit 140 is formed of a metal nut or a ring. The molten metal transfer ladles of FIGS. 2 and 3 are exemplary structures of molten metal transfer ladles manufactured by the molten metal transfer ladle manufacturing method according to the present invention. Therefore, the method of manufacturing ladle for transferring molten metal according to the present invention can be applied to manufacture ladles for transferring molten metal of various structures.

The ladle slurry production step (S10) is a step of producing a ladle slurry by mixing wollastonite, alumina cement, colloidal silica and water.

In the slurry preparation step, wollastonite and alumina cement are first mixed, and further colloidal silica and water are mixed to prepare a ladle slurry. That is, in the step of preparing the ladle slurry, wollastonite and alumina cement are mixed to prepare a primary mixture, and further, the primary mixture is mixed with colloidal silica and water to prepare a ladle slurry. The wollastonite is mixed at 80 to 97 wt% with respect to 100 wt% of the total wollastonite and alumina cement, and 3 to 20 wt% with alumina cement.

The wollastonite is low in chemical activity and excellent in durability, thereby preventing penetration of molten metal, thereby increasing longevity. In addition, the wollastonite has a high heat insulating property, which reduces the heat loss in the process of transferring the molten metal compared with the existing cast material.

The alumina cement adjusts the curing rate of the ladle body cast into the ladle slurry and increases the curing strength. In addition, the alumina cement belongs to the rapid hardened cement, but it is judged that the curing speed and the curing strength are appropriate because the impurities are fewer than other cements. If the content of the alumina cement is too small, the curing rate becomes too slow. If the content of the alumina cement is too high, the curing rate during casting of the ladle slurry is too fast, so that the shape of the ladle main body may not be well cast or a crack may be generated on the surface of the casted ladle main body.

On the other hand, among the commonly used cements, the ladle body cast as a slurry containing Portland cement or quick-setting cement does not normally cure. This is because it is judged that the hardening characteristics of the hydraulic cement are not sufficiently exhibited because the water content of the Portland cement or the quick hardening cement is small and the curing speed is delayed, and it is judged that this is not appropriate for the ladle slurry.

The colloidal silica serves as a binder in the curing of wollastonite and alumina cement. The colloidal silica increases the strength after curing of the ladle body. The colloidal silica is prepared by dispersing silica in water in an amount of 20 to 50% by weight based on the total weight of the colloidal silica. The colloidal silica is mixed in an amount of 10 to 50 parts by weight, preferably 25 to 40 parts by weight, based on the total weight of the primary mixture.

If the content of the colloidal silica is too small, the effect of increasing the strength after curing of the ladle main body is not large. If the content of the colloidal silica is too large, a silica layer may be formed on the surface of the ladle body after casting and curing, and may be removed during drying.

The water is mixed in an amount of 1 to 30 parts by weight, preferably 10 to 20 parts by weight, based on the total weight of the primary mixture. The water is appropriately mixed according to the amount of the colloidal silica to be mixed. The water acts as a binder in the ladle slurry and on the other hand, it imparts fluidity to the ladle slurry and smooths the casting. If the content of water is too small, cracking may occur on the surface during curing and drying of the ladle body. Also, if the content of water is too large, the concentration of the ladle slurry becomes too low, and layer separation may occur during the casting process.

The step (S20) of casting the ladle main body is a step of casting the ladle main body by supplying the ladle slurry after inserting the inner mesh into the casting mold of the ladle main body shape. An inner mesh and a steel band are inserted in advance into the casting mold. Further, a coupling unit is positioned on the casting mold. The ladle slurry is fed to a casting mold and cast into a ladle body. The cast ladle body has an inner mesh and a steel band inside, and a coupling unit is coupled to the upper part.

The fusion prevention layer coating step (S30) is a step of coating a fusion prevention layer on the surface of the casted ladle body. The deposition preventive layer is formed by coating a surface of a ladle body with a fusion preventive coating liquid in which wollastonite and colloidal silica are mixed. The fusion preventing coating liquid is formed by mixing wollastonite and colloidal silica in a weight ratio of 1: 0.6 to 1.5. Since the wollastonite is the main component of the ladle main body, the bonding strength between the fusion prevention layer and the ladle body is increased to prevent the fusion prevention layer from being peeled off during use. Since the colloidal silica acts as a binder, the fusion prevention layer is uniformly formed on the surface of the ladle body.

When the content ratio of the colloidal silica is less than 1: 0.6, the content of the wollastonite is increased to cause aggregation and the coating layer is not beautiful. Also, when the content ratio of the colloidal silica is higher than 1: 1.5, the content of wollastonite becomes small so that the wollastonite is not coated and flows down to form a coating layer.

The fusing prevention layer covers the glass cloth exposed on the surface of the casted ladle main body to prevent the glass cloth from directly contacting the molten metal to prevent the molten metal from being fused to the surface of the ladle.

The boron nitride layer coating step (S40) is a step of coating a boron nitride layer on the surface of the fusion prevention layer. The boron nitride layer improves the wetting property of the surface of the ladle with respect to the molten metal so that the molten metal is not fused to the surface of the ladle but flows well upon discharge of the molten metal. The boron nitride layer is formed by supplying a slurry of boron nitride to the surface of the ladle body by a spraying method or a brushing method. At this time, sediments, dust, etc. existing on the surface of the ladle body are removed in advance.

Next, a more specific embodiment of a method for manufacturing a ladle for transferring molten metal according to an embodiment of the present invention will be described with comparative examples.

Table 1 shows the results of relative comparisons of curing properties and strengths of the ladle according to Examples and Comparative Examples. As described above, the embodiment is a method for producing a ladle slurry by mixing colloidal silica with water after preparing a primary mixture of wollastonite and alumina cement. At this time, the content of each component was determined within the content range of each component described above.

In the comparative examples for cement selection, the types of cement or binder were different. The contents of the other components to be mixed in the comparative examples were the same as those in the examples.

For the examples and the comparative examples, the curing speed of the casting ladle main body and the ladle strength were compared and evaluated.

division Ingredient mixing condition Evaluation results Comparative Example 1 Wollastonite
+
Alumina cement water glass Curing X Comparative Example 2 water Curing O Strength X Comparative Example 3 Colloidal silica Cure O Strength O Example Colloidal silica + water Curing ◎ strength ◎ Comparative Example 4 Wollastonite
+
Portland cement water Curing X Comparative Example 5 Colloidal silica Curing O Strength X Comparative Example 6 Colloidal silica + water Curing O Strength X Comparative Example 7 Wollastonite
+
Quick hard cement water Curing X Comparative Example 8 Colloidal silica Curing O Strength X Comparative Example 9 Colloidal silica + water Curing O Strength X

In the above table,

For curing

"X": No condensation / aggregation

"O": Condensation / aggregation is well done

For strength

"X": When de-molding can not be handled

"O": Handling is possible when demoulding, but the strength of the edge is not manifested

"&Amp; &" means handling when demolding and excellent strength properties without dropping the corner.

As can be seen from the above table, when the cement is alumina cement and the binder is a mixture of colloidal silica and water, the curing characteristics and the strength characteristics are excellent.

100: Ladle transporting ladle
110: ladle main body 120: internal mesh
130: steel band 140: coupling unit

Claims (6)

A ladle slurry production step of producing a ladle slurry by mixing wollastonite, alumina cement, colloidal silica and water,
A ladle main body casting step of casting the ladle main body by supplying the ladle slurry after inserting the inner mesh into the casting mold of the ladle main body shape,
A fusing prevention layer coating step of coating a fusing prevention layer on the surface of the cast ladle body and
And a boron nitride layer coating step of coating a surface of the fusion prevention layer with a boron nitride layer,
Wherein the fusion prevention layer is formed by coating a surface of the ladle body with a fusion preventive coating liquid in which wollastonite and colloidal silica are mixed,
Wherein the fusion preventive coating liquid is formed by mixing the wollastonite and the colloidal silica in a weight ratio of 1: 0.6 to 1.5. The method according to claim 1,
Wherein the ladle slurry is formed by mixing wollastonite and alumina cement to form a primary mixture and mixing the primary mixture with colloidal silica and water. 3. The method of claim 2,
Wherein the primary mixture comprises 80 to 97 wt% of the wollastonite with respect to 100 wt% of the total wollastonite and alumina cement, 3 to 20 wt% of the alumina cement,
The colloidal silica is a solution in which 20 to 50% by weight of the colloidal silica is dispersed in water and is mixed in an amount of 10 to 50 parts by weight based on the total weight of the primary mixture,
Wherein the water is mixed in an amount of 1 to 30 parts by weight based on the total weight of the primary mixture. 3. The method of claim 2,
The colloidal silica is a solution in which 20 to 50% by weight of the colloidal silica is dispersed in water and is mixed in an amount of 25 to 40 parts by weight based on the total weight of the primary mixture,
Wherein the water is mixed in an amount of 10 to 20 parts by weight based on the total weight of the primary mixture. delete The method according to claim 1,
Wherein the inner mesh is formed of a glass cloth, a carbon mesh, a steel mesh, or a basalt fiber mesh.
KR1020150173741A 2015-12-08 2015-12-08 Manufacturing Method of ladle for transferring molten metal KR101629242B1 (en)

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JP2016180407A JP6318208B2 (en) 2015-12-08 2016-09-15 Manufacturing method of ladle for molten metal transfer

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Publication number Priority date Publication date Assignee Title
KR102573649B1 (en) 2023-01-12 2023-09-01 한세로재 주식회사 Ladle For Conveying Molten Aluminum And Method For Manufacturing The Same

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Publication number Priority date Publication date Assignee Title
CN109773118A (en) * 2019-02-27 2019-05-21 江苏百高新材料科技有限公司 A kind of coating process of steel casting shell

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JPS5029493B1 (en) * 1970-04-15 1975-09-23
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KR20000043693A (en) * 1998-12-29 2000-07-15 이구택 Alumina-based thermal spray material containing graphite and preparation method thereof
KR100317307B1 (en) * 1999-09-20 2001-12-24 신승근 Monolithic Basic Refractories Having High Durability
JP2011068505A (en) * 2009-09-24 2011-04-07 Nichias Corp Method for manufacturing refractory molding for metal casting and method for manufacturing refractory sintered compact for metal casting

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Publication number Priority date Publication date Assignee Title
KR102573649B1 (en) 2023-01-12 2023-09-01 한세로재 주식회사 Ladle For Conveying Molten Aluminum And Method For Manufacturing The Same

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