KR20140082562A - Fireproof Container Improved in Circulation of Heat and Safety of Use - Google Patents
Fireproof Container Improved in Circulation of Heat and Safety of Use Download PDFInfo
- Publication number
- KR20140082562A KR20140082562A KR1020130147166A KR20130147166A KR20140082562A KR 20140082562 A KR20140082562 A KR 20140082562A KR 1020130147166 A KR1020130147166 A KR 1020130147166A KR 20130147166 A KR20130147166 A KR 20130147166A KR 20140082562 A KR20140082562 A KR 20140082562A
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- KR
- South Korea
- Prior art keywords
- refractory
- refractory container
- container
- protruding block
- heat treatment
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B2014/0843—Lining or casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
- F27B2014/102—Form of the crucibles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
- F27B2014/104—Crucible linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The present invention relates to a refractory container improved in thermal circulation and safety, and a refractory container improved in thermal circulation and safety according to an embodiment of the present invention is a refractory container loaded in an industrial furnace for heat treatment of a powder or an article, And a convex portion is formed on the outer wall of the refractory container.
According to another aspect of the present invention, there is provided a refractory vessel for heat treatment, the refractory vessel having improved thermal circulation and safety, wherein the refractory vessel is a hexahedron having a space or spaces with a predetermined volume for accommodating powder or articles to be heat- And a protruding block having a predetermined shape is formed on at least one of the outer front surface, the rear surface, the left surface, and the right surface of the refractory container.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory container used for a high-temperature heat treatment such as powder or parts, and more particularly to a refractory container used for a high- And the gap can be easily maintained, so that circulation of the heat and the gas during the heat treatment is uniform and smooth.
It can be used in high-tech electronic industries such as ferrite, condenser, varistor, PTC, MLCC and other electronic parts, firing of metal or ceramic powder products, heat treatment of metal and ceramic powder, Kiln), RHK (Roller Hearth Kiln), tunnel type continuous furnace, pusher type continuous furnace, vacuum sintering furnace, elevator type furnace are used.
In the above-described heat treatment furnace, a refractory container is used for carrying out a heat treatment uniformly and safely at a high temperature by containing an object such as a part or powder. These refractory vessels are often used in rectangular refractory vessels, but circular refractory vessels are also used. In addition to the name 'refractory vessels', they are also referred to as crucibles, box saggers, trays, crucibles, and setters.
5, the furnace itself has a length of about 20 to 100 m and is composed of a preheating
As the
At this time, as shown in FIG. 7, the refractory vessels are continuously moved from the first row to the fourth column on the
On the other hand, in the case of a typical non-continuous loop line type furnace, the
The refractory container containing the
At this time, the refractory vessels are arranged at regular intervals on the
In addition to the above-mentioned RHK furnace, the refractory vessel is similarly used in other heat treatment furnaces such as a tunnel continuous furnace, a pusher type continuous furnace, a vacuum sinter furnace, and an elevator furnace.
On the other hand, refractory vessels are usually manufactured through the following processes.
In this case, ceramic raw materials such as Alumina, Silica, Magnesia, Mullite, Kaolin, Clay, Talc, Spinnel, Chamotte and Cordierite are used as main raw materials and these raw materials are mainly composed of Al 2 O 3,
These raw materials are pulverized into powders of several micron to several millimeters in size.
Processes for manufacturing refractory containers include a press method and an injection molding method.
At this time, each of the raw materials in the form of powder is weighed according to the mixing ratio according to the characteristics (usage, use temperature, product shape, strength, etc.) required for the refractory container to be manufactured, and then the mixture is uniformly mixed using a mixer For example, polyvinyl alcohol, carboxymethylcellulose, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, A binder such as methylcellulose, a lubricant, a releasing agent and the like are added.
In this manner, a raw material mixture to which water and an additive are added is prepared, a mold capable of forming a rectangular or circular container shape is prepared, and mounted on a press capable of applying a high pressure such as a hydraulic press, a friction press, The raw material mixture to which the moisture and the additive is added is injected into the mold and is pressed by a press to form a refractory container such as a quadrangle or a circle.
The molded article thus molded is put into a dryer and dried at a temperature of 50 캜 or higher for about 12 hours to make the water content in the molded article to be within 1%.
The dried shaped body is calcined in a kiln at a temperature of 1200 to 1700 ° C. for 2 hours or more to complete a refractory vessel having a certain strength through sintering and thermochemical reaction of the raw powder.
On the other hand, in the injection molding method, each raw material in powder form is weighed according to the mixing ratio according to the characteristics (usage, use temperature, product shape, strength, etc.) required for a refractory container to be manufactured, And 10 to 20% of water, a dispersant, a binder and the like are added, and the mixture is stirred with a stirrer to obtain a viscous liquid.
When the viscous liquid thus prepared is injected into a mold of a gypsum mold having a shape of a refractory container, the gypsum absorbs moisture from the viscous liquid, and after a certain time, the viscous liquid becomes a solid molded article having the shape of the refractory container.
The molded article thus molded is put into a dryer and dried at a temperature of 50 캜 or higher for about 24 hours so that the moisture content in the molded article is within 1%.
The dried body is baked in a kiln at a temperature of 1200 to 1700 ° C. for 2 hours or more to complete a refractory container having a certain strength through sintering and thermochemical reaction of the raw powder.
Refractory vessels have been used for various types of heat treatment industrial furnaces in which powder or certain types of articles are packed and subjected to high temperature heat treatment. However, various problems arise due to structural characteristics of the heat treatment furnace and problems in use during use.
That is, in the case of the continuous furnace RHK, the length of the furnace itself is shortened from 20 m to 100 m, and the refractory container is moved by the rotation of the roller in the furnace.
In this case, it is important that the movement of the refractory container moved by the rotation of the rollers of the entire furnace is linear, and the level of the roller is accurately adjusted for linear movement. However, The straightness may be distorted.
Particularly, as shown in FIG. 6 (b), when the refractory vessels are arranged at the entrance of the furnace for the thermocycling, the proceeding direction and the proceeding speed are slightly increased As shown in FIG. 7 (b), as shown in FIG. 7 (b), the intervals are different from each other, the uniformity of the temperature is not good and the distances between the refractory containers are deteriorated and the rectilinearity of the refractory container is deteriorated due to interference between the refractory containers. There is a case where the inside of the furnace is damaged due to a collision with the wall surface, or the inside of the furnace is partially collapsed to stop the furnace operation.
Therefore, in order to enhance the operational safety to the RHK, there is no gap between the refractory container and the refractory container as shown in FIG. 6 (a). In this case, there is no gap between the refractory container and the refractory container, And the uniformity of the heat treatment temperature is lowered.
8 (a) and 8 (b), the refractory vessels are stacked on the truck in a multi-stage manner. As shown in FIG. 8 (a) When the load is transferred, the damage to the objects to be burned and the refractory container due to the shaking can be reduced when the truck is moved to the inside of the main body, but the heat circulation is not good and the heat treatment temperature inside the furnace is varied.
On the other hand, if the gap is as shown in FIG. 8 (b), the temperature deviation due to the improvement of the heat circulation is reduced, but the risk of damage to the object to be sintered and the refractory container becomes large due to the shaking motion when moving the trolley. In some cases, the vessel collapses and accidents occur.
As described above, conventional refractory vessels have problems in heat circulation and safety in use during heat treatment.
It is an object of the present invention to provide a refractory container which is smoothly circulated and heat-treated in a heat treatment.
The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.
The refractory container improved in thermal cycling and safety according to an embodiment of the present invention achieves the above-described object by means of the following solution.
First, in a refractory container mounted in an industrial furnace for heat treatment of a powder or an article, a convex portion may be formed on an outer wall of the refractory container.
Preferably, the convex portion may be provided at a corner or a central portion of the outer wall, and the convex portion may be installed perpendicularly or horizontally to the outer wall.
Preferably, the convex portion may be installed on an upper portion or a lower portion of the outer wall. The convex portion may be installed on the left side, the right side, the front side and the rear side of the outer side wall, or may be provided on either the left side, the right side, .
Preferably, the convex portion may be formed in an area of 40% or less of the area of the outer wall surface.
Meanwhile, the refractory container improved in heat circulation and safety according to another embodiment of the present invention achieves the above-described object by means of the following solution.
In the refractory container for heat treatment, the refractory container is formed of a hexahedron having a space of a predetermined volume for accommodating a powder or an article to be heat-treated, wherein the refractory container includes a front surface, a rear surface, a left surface and a right surface At least one surface may have a protruding block of a predetermined shape.
Preferably, the protruding block may be formed at the top, bottom or center of the outer edge of the refractory container, and the protruding block may be formed at the top, bottom or center of the outer front, back, left and right sides of the refractory container .
Preferably, the protruding block may be formed as a hexahedron having a protrusion height of 5 to 15 mm, and is integrally formed with the refractory container to prevent separation from the refractory container, wherein the refractory container and the protruding block are made of alumina (Al 2 O 3 ), silica (SiO 2 ), magnesia (MgO), zirconia (ZrO 2 ) and calcia (CaO).
The protruding block may be formed to occupy 5 to 30% of the entire area of the surface on which the protruding block is formed.
The refractory container improved in heat cycle and safety according to the embodiments of the present invention has convex portions or protruding blocks of a predetermined size formed on the outer wall surface, so that the circulation of heat is smooth during the heat treatment and the use is safe.
That is, the refractory container improved in thermal circulation and safety according to the embodiments of the present invention is easy to maintain the space between the refractory container and the refractory container, and the circulation of the heat inside the furnace is uniform and smooth and the uniformity of the heat treatment is improved. There is an advantageous effect that the straightness of movement is increased in the road, and there is no shaking in the bogie type road and the overturning accident does not occur.
Fig. 1 (a) is a general refractory vessel, and (b), (c), (d) and (e) are refractory vessels with improved thermocycling and safety according to the embodiments of the present invention.
FIG. 2 is a top view of a refractory container improved in thermal circulation and safety according to embodiments of the present invention, FIG. 3 is a side view of a refractory container improved in thermal circulation and safety according to embodiments of the present invention,
Fig. 4 is a view showing an example of a method of using the refractory vessel in the bogie type furnace, Fig. 5 is an example of a method of using the refractory vessel in the RHK furnace, Figs. 6 to 8 are views showing the arrangement of the refractory vessels in the heat treatment furnace, .
The term used in the present invention is a general term that is widely used at present. However, in some cases, there is a term selected arbitrarily by the applicant. In this case, the term used in the present invention It is necessary to understand the meaning.
1 (a) is a general refractory container, and (b), (c), (d), and (e) are refractory vessels with improved thermal circulation and safety according to the embodiments of the present invention.
FIG. 2 is a top view of a refractory container improved in thermal circulation and safety according to embodiments of the present invention, FIG. 3 is a side view of a refractory container improved in heat circulation and safety according to the embodiments of the present invention, Fig. 5 is an illustration of a method of using the refractory vessel in RHK, and Figs. 6 to 8 are examples of the arrangement and loading method of the refractory vessel in the heat treatment furnace.
Hereinafter, the
First, the
1 (b), 1 (c), 1 (d), and 1 (e) show a refractory container having an improved thermocycling and safety according to an embodiment of the
The
The
In addition, the
That is, it may be provided only in one of the left and right sides, the front side and the rear side, or may be provided in one side and the front side or the rear side at the same time.
The
On the other hand, when the
That is, in the typical continuous furnace RHK, it is possible to arrange the refractory containers as shown in FIGS. 6C and 6D so that the
On the other hand, when the conventional refractory container is arranged as shown in FIG. 6 (b), the refractory containers move individually while moving inside the furnace, causing a gap between the refractory containers and changing the direction of the refractory container. Since the
8 (c) or 8 (d), it is possible to use the
In order to manufacture the
Then, water or an organic additive is added to the ceramic raw material, and the mixture is homogeneously mixed using a mixer. Then, the ceramic raw material is put into a mold and pressure is applied to produce a
Thereafter, the formed body is dried at a temperature between 50 ° C and 150 ° C to remove moisture, and the dried body is fired at a temperature of 1200-1700 ° C in a heat treatment furnace to have a certain strength, thereby improving the circulation of heat Thereby completing the
Hereinafter, the
The
In this case, the powder or article to be subjected to the heat treatment may be various powders or articles requiring heat treatment. However, the
On the other hand, the lithium compound is an important material used in various industrial fields and is mainly used as a positive electrode material of a lithium secondary battery.
At this time, the cathode active material containing lithium ion, which is an energy source of the lithium secondary battery, is used in the form of lithium metal oxide. In the lithium secondary battery, lithium ion and transition metal oxide are electrochemically inserted and desorbed according to charging and discharging, LiCoO 2 , LiNiO 2 , LiNi x Co y Mn z O ₂ vary depending on the metal oxide.
Meanwhile, the lithium cathode active material is prepared by mixing a lithium compound such as Li 2 CO 3 or LiOH and a precursor of a transition metal (Co, Mn, Ni, Fe, etc.) at a predetermined ratio into a heat treatment vessel, A lithium compound and a transition metal precursor are reacted with each other to prepare a lithium metal composite oxide for a cathode active material of a lithium secondary battery.
At this time, since the characteristics of the lithium metal composite oxide for the cathode active material synthesized by the heat treatment conditions are sensitively changed, it is necessary to control the uniform heat treatment condition. For this purpose, the heat- .
Meanwhile, the
As described above, the
The reason for limiting the size of the
In the
1, the protruding
In addition, the protruding
Meanwhile, the
In addition, the protrusion height of the
The protruding height of the
The protruding
However, in another embodiment of the present invention, the protruding
The method using the above-described ceramic adhesive has the following problems.
Since the
In another embodiment of the present invention, the protruding
The more detailed description of this, the projecting
Preferably, the sum of the components of alumina, silica, and magnesia is 90% or more in consideration of the heat resistance and corrosion resistance of the
However, since the
In addition, the
The reason for limiting the charge area of the
As a result, the
That is, the
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications may be made by those skilled in the art.
100: Refractory vessel with improved thermal cycling and safety
110: protrusion, protrusion block
111: circulation space part
120:
130:
140:
150: Bogies
160: Roller
170: Yes Tropical
180:
190: Cooling zone
Claims (12)
And a convex portion is formed on an outer wall of the refractory container.
Wherein the convex portion is provided at an edge or a central portion of the outer wall.
And the convex portion is provided in the vertical or horizontal direction on the outer wall.
And the convex portion is provided on an upper portion or a lower portion of the outer wall.
Wherein the convex portion is provided on both the left side, the right side, the front side and the rear side of the outer wall, or is provided on only one of the left side, the right side, the front side and the back side.
And the convex portion is formed in an area of 40% or less of the area of the outer wall surface.
Wherein the refractory container is made of a powder or a hexahedron having a space having a predetermined volume for accommodating the article,
Wherein a protruding block having a predetermined shape is formed on at least one of an outer front surface, a rear surface, a left surface, and a right surface of the refractory container.
Wherein the protruding block is formed at an upper portion, a lower portion, or a center of the outer edge of the refractory container.
Wherein the protruding block is formed at an upper portion, a lower portion, or a center of an outer front surface, a rear surface, a left surface, and a right surface of the refractory container.
Wherein the protruding block is formed in a hexahedron having a projection height of 5 to 15 mm.
The projecting block doedoe to prevent the separation in the refractory container integrally molded with said refractory container, the refractory container and the projecting block of alumina (Al 2 O 3), silica (SiO 2), magnesia (MgO), zirconia (ZrO 2 ) and calcia (CaO), or a mixture of at least two or more thereof.
Wherein the protruding block is formed to occupy 5 to 30% of a total area of the surface on which the protruding block is formed.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310690342.6A CN103900385A (en) | 2012-12-24 | 2013-12-16 | Fireproof container improved in circulation of heat and safety of use |
US14/107,790 US20140178827A1 (en) | 2012-12-24 | 2013-12-16 | Fireproof container improved in circulation of heat and safety of use |
JP2013259779A JP2014122783A (en) | 2012-12-24 | 2013-12-17 | Refractory container improved in heat circulation and safety |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020120151956 | 2012-12-24 | ||
KR20120151956 | 2012-12-24 |
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KR20140082562A true KR20140082562A (en) | 2014-07-02 |
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KR1020130147166A KR20140082562A (en) | 2012-12-24 | 2013-11-29 | Fireproof Container Improved in Circulation of Heat and Safety of Use |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101956559B1 (en) * | 2018-03-06 | 2019-03-11 | 이경재 | Gas circulating ceramic container |
KR20210033343A (en) * | 2019-09-18 | 2021-03-26 | 주식회사 에스엠랩 | Crucible and crucible assembly for preparing cathode active material |
-
2013
- 2013-11-29 KR KR1020130147166A patent/KR20140082562A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101956559B1 (en) * | 2018-03-06 | 2019-03-11 | 이경재 | Gas circulating ceramic container |
KR20210033343A (en) * | 2019-09-18 | 2021-03-26 | 주식회사 에스엠랩 | Crucible and crucible assembly for preparing cathode active material |
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