KR102115981B1 - Melting apparatus having function of protection of heating element - Google Patents

Abstract

Disclosed is an apparatus for melting a waste denitrifying catalyst having a heating element protection function. According to one embodiment of the present invention, the apparatus for melting the waste denitrifying catalyst having the heating element protection function comprises: a hopper unit which is provided to input raw materials including waste catalyst powder and an alkaline agent; a transfer unit which is provided for transferring the raw materials to a certain position, and wherein one end unit is connected to the hopper unit; a plurality of heating units which are provided on the other end unit of the transfer unit, and apply heat to the raw materials to make melted solution; and a melting unit which is provided on a lower side of the other end unit of the transfer unit, accommodates the raw materials, and stores the melted solution melted by the heating unit. The heating unit includes: a plurality of heating elements which radiate heat towards the melting unit, and are arranged by being apart from each other at regular intervals; and a protective cover which wraps around the heating elements for preventing the materials scattered from the melting unit from coming in contact with the heating elements. The present invention is to provide an apparatus for melting a waste denitrifying catalyst having a heating element protection function, which can improve durability of the heating element.

Description

Waste denitrification catalyst melting device with heating element protection function {MELTING APPARATUS HAVING FUNCTION OF PROTECTION OF HEATING ELEMENT}

The present invention relates to a waste denitration catalyst melting apparatus having a heating element protection function, and more particularly, to a waste denitration catalyst melting apparatus for preventing high-temperature oxidation and contact with corrosion gas of a heating element that heats a waste catalyst.

In general, when fossil fuels such as coal, petroleum, and natural gas are burned, combustion gas containing a large amount of nitrogen oxides (NOx) is generated. As such, the amount of nitrogen oxide is proportionally increased according to the amount of fossil fuel used, and it has been pointed out as a representative cause of problems such as fine dust, acid rain, and photochemical smog.

Accordingly, a denitration catalyst is used as part of the purpose of reducing atmospheric emission of nitrogen oxide, an air pollutant, and the mechanism of the denitration catalyst is a SCR (Selective) equipped with a denitration catalyst by injecting ammonia (NH ₃ ) into combustion gas. Catalytic Reduction) When injected into the reactor, NO _x and NH ₃ inside the SCR reactor chemically act on the catalyst surface to reduce nitrogen molecules (N ₂ ) and water vapor molecules (H ₂ O) to reduce the concentration of the nitrogen oxide. The Lord plays a role.

Denitrification catalysts, such as the SCR catalyst, are catalysts having a service life of approximately 25,000 hours, and current denitrification catalysts are used in large quantities in most apparatuses using fossil fuels, and thus, when a certain service life has elapsed, a large amount Waste denitrification catalyst is generated, which causes an environmental problem in which secondary waste is generated.

Accordingly, in order to improve the environmental problems as described above, recently, expensive valuable metals such as titanium (Ti), tungsten (W), and vanadium (V) contained in the waste denitration catalyst are recovered and used by the waste denitration catalyst. Techniques for minimizing environmental pollution of secondary wastes have been proposed.

Korean Patent Publication No. 10-2019-0074745 (published on June 28, 2019)

Embodiments of the present invention, as part of the purpose of recovering valuable metals from the waste denitration catalyst, the waste catalyst is melted with high temperature heat, but the heating element is prevented from contacting the heating element in an oxidizing atmosphere at a high temperature so that the durability of the heating element is improved. It is intended to provide a waste denitration catalyst melting apparatus having a heating element protection function.

According to an embodiment of the present invention, a hopper portion provided to input a raw material containing a waste catalyst powder and an alkali agent; A transfer unit provided to transfer the raw material to a predetermined position, and one end connected to the hopper portion; A plurality of heat generating units are provided at the other end of the transfer unit, and made of a molten liquid by applying heat to the raw materials; And a melting unit provided below the other end of the transfer unit to receive the raw material and to store the melt melted by the heat generating unit. The heat generating unit dissipates heat toward the melting unit. , A plurality of heating elements are spaced apart a predetermined interval; And a protective cover surrounding the heating element and preventing a scattering material scattered from the melting unit from contacting the heating element, a waste denitration catalyst melting apparatus.

In addition, the heating element is provided above the melting unit, the horizontal heating unit is arranged to be spaced apart a predetermined distance along the direction of movement of the melt; And a vertical heating unit disposed at a predetermined interval above the upstream side of the melting unit from which the molten liquid starts to be generated, and disposed in a height direction with respect to the melting unit to provide heat to the upstream side of the melting unit. have.

In addition, the horizontal heating unit may be provided in a plurality of layers spaced apart at predetermined intervals along the height direction of the melting unit.

In addition, the horizontal heating part, the horizontal heating part of the upper layer among the horizontal heating parts of the plurality of layers may be disposed between the horizontal heating parts of the lower layer.

In addition, the protective cover may be provided to individually wrap and protect at least one of the horizontal heating part and the vertical heating part.

In addition, the protective cover, the horizontal heating portion and the vertical heating portion may be configured to wrap while being spaced a predetermined distance from the outer surface so as not to contact the outer surface.

In addition, the protective cover may include an aluminum component so that a protective film of Al ₂ O ₃ is formed on the inner and outer surfaces.

In addition, the protective cover may further include at least one component of iron and chromium.

In addition, the melting unit, the molten metal is formed extending in a direction away from the transfer unit from below the other end of the transfer unit to enable storage of the raw material and the molten liquid; And an elution port provided at an end of the molten metal farthest from the other end of the transfer unit to discharge the melt to the outside of the molten metal.

In addition, the transfer unit may be provided in a plurality of spaced apart predetermined intervals in the hopper portion, and the outlet may be provided in a plurality of spaced apart predetermined intervals at the end of the molten metal.

According to an embodiment according to the present invention, when recovering expensive valuable metals from the waste denitration catalyst, the alkali gas generated in the molten melt of the waste catalyst is prevented from coming into direct contact with the heating element, thereby significantly improving the durability of the heating element. Therefore, since the melting process of the waste catalyst can be maintained without interruption, the recovery efficiency of valuable metals is improved, and maintenance and repair costs are reduced.

In addition, according to the embodiment of the present invention, when the waste catalyst is melted, the heating element is additionally installed in the height direction on the upstream side of the molten metal, which requires a lot of heat, so that the heating performance of the heating element is reduced by fine raw material particles and dust. It can be prevented.

In addition, according to an embodiment of the present invention, by providing a plurality of transfer units for transporting the raw material and a plurality of elution ports for discharging the melt, each of the advantages of improving the productivity in the melting process of the waste catalyst and improving the flowability and cooling of the melt. have.

1 is a side view schematically showing a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention.
2 is a plan view schematically showing a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention.
3 is a cross-sectional view showing line AA of FIG. 2.
Figure 4 is a reference diagram showing a state in which the heating unit is assembled and decomposed, respectively, in a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention.
5 is a reference view showing a protective cover on which an aluminum oxide protective film is formed on the outer surface of FIG. 4.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in the description of the present invention, when it is determined that detailed descriptions of related known configurations or functions may flow the gist of the present invention, detailed descriptions thereof will be omitted.

1 is a side view schematically showing a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention, and FIG. 2 is a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention 3 is a cross-sectional view showing the AA line of FIG. 2, and FIG. 4 is a state in which a heating unit is assembled in a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention, and Reference diagrams showing the disassembled state, respectively. FIG. 5 is a reference diagram showing a protective cover in which an aluminum oxide protective film is formed on the outer surface of FIG. 4.

1 to 3, the waste denitration catalyst melting apparatus 10 having a heating element protection function according to an embodiment of the present invention includes a hopper unit 100, a transfer unit 200, a heating unit 300 and melting It may include a unit 400.

The meaning that one embodiment of the present invention includes the components listed above does not mean that the components are composed of only these components, but that these components are basically included, and other components (for example, a well-known technique widely used in a waste denitration catalyst melting apparatus). Although it means that it may include, the detailed description of the known technology is omitted because it may obscure the subject matter of the present invention.

The hopper part 100 is a configuration provided to input raw materials in the form of a mixture containing waste catalyst powder and an alkali agent.

Among the raw materials input to the hopper part 100, the waste catalyst powder is made of fine particles in powder form to easily recover expensive valuable metals such as titanium, tungsten, and vanadium contained in the waste denitration catalyst through melting and leaching processes. Means

The waste catalyst powder can be produced in various ways, but according to an embodiment of the present invention, a predetermined alkali agent is mixed with the waste denitrification catalyst and it can be produced through a method of grinding it in a grinder. The raw material produced in the form of fine particles is put into the hopper 100.

Here, the alkali agent mixed together in the waste denitration catalyst may be a sodium-based alkali agent such as sodium carbonate (Na ₂ CO ₃ ) or sodium hydroxide (NaOH), and an alkali agent of another component may be used as necessary.

For reference, when recovering valuable metals such as titanium, tungsten, and vanadium from waste denitrification catalysts, the sodium ions of the sodium-based alkali react with the valuable metals to increase the leaching rate. Can be mixed in.

The hopper unit 100 may be provided in a structure in which the upper portion is wider and narrower toward the lower portion to facilitate the introduction of raw materials as described above. In the upper portion of the hopper portion 100, an inlet 110 through which raw materials are introduced may be formed, and in the lower portion, an outlet 120 through which raw materials are discharged to the outside of the hopper portion 100 may be formed.

In addition, although the hopper unit 100 may be provided as one, it is also possible to separate the sections into a plurality of pieces as necessary. At this time, as shown in FIG. 3, the upper inlet 110 may be formed as one, and the lower outlet 120 is divided into a plurality of sections to evenly distribute and discharge the raw materials discharged from the hopper 100. Can be. Accordingly, not only the supply speed of the raw material delivered to the melting unit 400 to be described later is increased, but also the raw material is uniformly loaded without being overloaded at any point of the melting unit 400, thereby improving the melting performance of the raw material. .

On the other hand, the transfer unit 200 is a configuration provided to transfer the raw material stored in the hopper 100 to a predetermined position. One end of the transfer unit 200 is located in the hopper unit 100 may receive the raw material discharged from the hopper unit 100, the other end of the transfer unit 200 is a point that requires the transfer of raw materials (for example, molten metal 410 upstream).

Specifically, the transfer unit 200 may include a power generating unit 210 and a feeding screw 220 as shown in Figure 1 for the transfer of raw materials.

The power generating unit 210 is a configuration for providing rotational force to the feeding screw 220, and may be formed of an engine or a driving motor capable of generating rotational force, and other types of power sources may be used as necessary.

The feeding screw 220 is connected to the power generating unit 210 and configured to be rotatable, and may include a rotating shaft and a vane formed in a spiral direction on the rotating shaft. Since the feeding screw 220 is generally widely known, illustration and description of the detailed structure thereof are omitted.

 When the power generating unit 210 is operated, the feeding screw 220 is rotated to transfer the raw material in the feeding screw 220 to a predetermined position. At this time, one end of the feeding screw 220 may be located below the discharge port 120 of the hopper 100 to receive raw material of the hopper 100.

In addition, the transfer unit 200 may be provided as a single piece, but may be provided as a plurality of pieces spaced apart at a predetermined interval to the hopper 100 as shown in FIGS. 2 and 3.

When a plurality of transfer units 200 are provided, it is possible to increase the amount of transfer of raw materials so that the raw materials are smoothly supplied to the melting unit 400, and the raw materials are not accumulated excessively at any point of the melting unit 400, and are evenly distributed. Since it is distributed and loaded, it is possible to improve the melting performance of the raw materials as described above.

At this time, the plurality of transfer units 200 are respectively disposed to correspond to the plurality of discharge ports 120 separated from the hopper unit 100 as described above, the raw material to a plurality of paths to a plurality of points of the melting unit 400 Can be transferred to.

The heating unit 300 is provided to heat the raw material loaded on one side of the melting unit 400 by the transfer unit 200 to make the raw material into a molten liquid, and a plurality of other portions are provided at the other end of the transfer unit 200 Can be.

Specifically, the heating unit 300 may include a heating element 310 and a protective cover 320 as shown in FIGS. 1 to 4.

The heating element 310 is configured to dissipate heat required for melting the raw material toward the melting unit 400. Accordingly, the solid raw material in the form of particulates loaded on the melting unit 400 may be melted while being heated by the heating element 310 to change the phase into a liquid melt. At this time, the heating element 310 may be arranged to be spaced apart at a predetermined interval to uniformly apply heat to the melting unit 400.

When the raw material is melted, the waste catalyst powder and the alkali agent contained in the raw material are chemically reacted, and thus the leaching of the valuable metal contained in the waste catalyst powder is facilitated in a later process, thereby increasing the recovery rate of the valuable metal.

Among the valuable metals contained in the waste catalyst powder, for example, tungsten and vanadium react with sodium hydroxide, which is a kind of an alkali agent.

WO ₃ + 2NaOH = Na ₂ WO ₄ (sodium tungstate) + 2H ₂ O

V ₂ O ₅ + 2NaOH = 2NaVO ₃ (sodium vanadate) + 2H ₂ O

In this case, sodium carbonate (Na ₂ CO ₃ ) may be used as the alkali agent, if necessary, instead of sodium hydroxide, which may be appropriately selected according to the needs of the practitioner.

Specifically, the heating element 310 may include a horizontal heating unit 311 and a vertical heating unit 312 because a lot of heat is required to phase-change the raw material in the form of particulates containing the valuable metal into a melt.

The horizontal heating unit 311 may be provided to be spaced apart a predetermined distance above the melting unit 400 in order to uniformly distribute heat along the longitudinal direction of the melting unit 400.

At this time, the horizontal heating unit 311 may be disposed to be spaced apart in the same direction as the moving direction of the molten liquid stored in the melting unit 400 (specifically, the molten metal 410) and flowing in one direction.

The raw material in the form of particulates dropped from the transfer unit 200 and loaded in the melting unit 400 starts to be made into a molten liquid while being heated by the heating unit 300, and thus the melting unit 400 in which the molten liquid starts to be generated. (The molten metal 410) (hereinafter, referred to as "upstream side") of the molten liquid is flowing away along the longitudinal direction of the melting unit 400 as the production amount of the molten liquid increases, away from the transfer unit 200 It moves to the end of the melting unit 400 (hereinafter referred to as "downstream").

As described above, the molten liquid flowing from the upstream side to the downstream side of the melting unit 400 is installed above the melting unit 400 and horizontally heated along the same direction as the moving direction of the molten liquid (specifically, the longitudinal direction of the molten metal 410). The chemical reaction of the waste catalyst powder and the alkali agent contained in the raw material may be promoted while being continuously heated by the part 311.

At this time, the horizontal heating unit 311 may be provided in a plurality of layers spaced apart a predetermined distance along the height direction, the heating element 310 is horizontally disposed with respect to the melting unit 400, as shown in FIG. In FIG. 1, the horizontal heating unit 311 is illustrated as being arranged in two layers, upper and lower, but this may increase as necessary.

When the horizontal heating unit 311 is provided in a plurality of layers, the horizontal heating unit 311 of the upper layer is disposed between the horizontal heating units 311 of the lower layer so that the heat of the upper layer is caused by the horizontal heating unit 311 of the lower layer. It is not blocked, so that a large amount can be delivered to the melting unit 400.

In addition, the vertical heating unit 312 is installed on the upper side of the upstream side of the melting unit 400, which requires a lot of heat to make the raw material of the particulate into a melt, and the vertical heating unit 312 is a horizontal heating unit 311 ) To provide additional heat sources that may be insufficient.

When additional supply of a heat source is required to the upstream side of the melting unit 400, a method of simply increasing the density and number of the horizontal heating units 311 can be considered, but the upstream side of the melting unit 400 is the transfer unit 200 Since the raw material of the fine particles dropped in the loading portion, the fine raw material and dust scattered upward from this position are stacked on the outer surface of the horizontal heating unit 311 lying in the horizontal direction with respect to the melting unit 400. The heat dissipation rate of (311) can be reduced.

Accordingly, a vertical heating unit 312 disposed in a height direction with respect to the melting unit 400 may be provided on the upstream side of the melting unit 400 to minimize accumulation of scattered fine raw material particles and dust.

As shown in FIG. 1, the vertical heating unit 312 may be arranged to be spaced apart at predetermined intervals along the width direction and the length direction of the melting unit 400, upstream of the melting unit 400, where the generation of the molten liquid begins. have.

At this time, the vertical heating unit 312 crosses the horizontal heating unit 311 so that the fine raw material particles and dust scattered from the melting unit 400 are difficult to accumulate on the outer surface (that is, the height with respect to the melting unit 400) Direction) to provide additional heat to the upstream side of the melting unit 400.

As such, since the vertical heating unit 312 has a structure that stands upright in the height direction with respect to the melting unit 400, heat dissipation efficiency may be improved because scattered raw materials and dust are difficult to accumulate on the outer surface compared to the horizontal heating unit 311. have. For reference, since the amount of the raw material changes to the molten liquid when it goes beyond the upstream side of the melting unit 400, there is almost no scattered material here, and the horizontal heating unit 311 alone can provide sufficient heat.

Here, the horizontal heating unit 311 and the vertical heating unit 312 may be heated using hot water, or an electric heater using a heating wire may be used, which can be appropriately selected according to the needs of the practitioner.

On the other hand, the protective cover 320, which is one component of the heating unit 300, surrounds the heating element 310 as shown in FIGS. 1 and 4, and scattering materials scattered from the melting unit 400 (for example, high temperature alkali) Gas) may be provided to prevent direct contact with the heating element 310.

As shown in FIG. 1, the protective cover 320 wraps each of the horizontal heating unit 311 and the vertical heating unit 312 individually, and generates heating elements in a scattering or high temperature oxidizing atmosphere in the melting unit 400 (metal 410) ( It is possible to prevent and protect the corrosion of the heating element 310 by preventing the direct contact 310.

For reference, when the horizontal heating unit 311 and the vertical heating unit 312 are exposed to an internal high temperature oxidizing atmosphere and scattering alkali powder, the corrosion of the heating element 310 may be caused to prematurely deteriorate the life of the heating element 310. Therefore, the protective cover 320 can protect the heating element 310 from the outside to extend the life of the heating element 310.

Here, the protective cover 320 may be configured to surround the outer circumferential surface of the heating element 310 while being in contact with the heating element 310, or may be configured to surround the outer circumferential surface of the heating element 310 while being spaced apart from the heating element 310 so as not to contact the heating element 310. As such, it is possible to select an optimal implementation method according to the needs of the practitioner.

In addition, the protective cover 320 includes an aluminum component, the aluminum component may further include at least one of iron and chromium, and the rest may be composed of other components as necessary. The protective cover 320 may be made of, for example, KANTHAL APM-T, and the content (% by weight) of the corresponding component among the aforementioned components may gradually decrease in the order of Fe ㅰ Al ㅰ Cr.

Accordingly, when the protective cover 320 is heated (eg, 850 ° C) by the heating element 310, the aluminum component contained therein is first dissolved and exposed to the outer surface to react with oxygen outside the protective cover 320. As shown in FIG. 5, a protective film 321 made of Al ₂ O ₃ (alumina / ceramic) may be generated on the inner and outer surfaces of the protective cover 320.

The protective film 321 not only protects the internal heating element 310 from volatile gas and other harmful substances remaining outside the protective cover 320, but also provides the protective cover 320 with heat resistance up to approximately 1450 ° C. The protective cover 320 can also protect itself to extend the life of the protective cover 320.

The melting unit 400 is configured to be provided below the other end of the transfer unit 200 to accommodate the raw material that is transferred from the transfer unit 200 and falls. The melting unit 400 not only accommodates the raw material in the form of particulates dropped by the transfer unit 200, but also stores the liquid melt produced by melting the raw material by the heat generating unit 300.

Specifically, referring to FIGS. 1 and 2, the melting unit 400 may include a molten metal 410 and an elution port 411.

The molten metal 410 may be configured in an open container shape to store raw materials and molten liquid, and may be located below the heating unit 300. In addition, the molten metal 410 may be formed to extend from the lower end of the transfer unit 200 in a direction away from the transfer unit 200.

Therefore, the molten metal 410 primarily receives the raw material that has fallen from the transfer unit 200, and when the raw material is changed into the molten liquid by the heat generating unit 300 located above, the molten liquid is stored secondarily, and the molten liquid is continuously It is formed to extend to a predetermined length toward a direction away from the transfer unit 200 from the lower end (ie, the upstream side of the molten metal 410) of the other end of the transfer unit 200 so as to flow to another place.

In addition, the elution port 411 is a configuration provided at the end (downstream side of the molten metal 410) of the molten metal 410 farthest from the other end of the transfer unit 200, the elution port 411 is the molten metal 410 It may be provided to discharge the molten solution stored in the molten metal 410 to the outside.

The elution opening 411 may be selectively opened and closed as necessary, and the elution amount of the melt may be controlled according to the opening and closing amount. In addition, a plurality of elution openings 411 may be provided in the molten metal 410 as illustrated in FIG. 2, and the plurality of elution openings 411 may be arranged in the width direction of the molten metal 410 at the ends of the molten metal 410. Accordingly, it may be arranged to be spaced apart at a predetermined interval.

Here, when a plurality of elution ports 411 are provided, the elution rate of the melt may be increased, and the flowability of the melt in the molten metal 410 may be improved. In addition, when a plurality of elution ports 411 are provided, cooling performance for cooling control of the temperature of the molten liquid to a predetermined temperature required for leaching is improved in a cooling process required for the leaching process of valuable metals after the molten liquid is discharged from the molten metal 410 Can be.

As described above, a waste denitration catalyst melting apparatus having a heating element protection function according to an embodiment of the present invention has been described as a specific embodiment, but this is only an example, and the present invention is not limited thereto, and according to the basic idea disclosed in the present specification It should be interpreted as having the broadest range. Those skilled in the art can combine and replace the disclosed embodiments to implement patterns in a shape that is not timely, but this is also within the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is obvious that such changes or modifications fall within the scope of the present invention.

100: hopper 110: input
120: outlet 200: transfer unit
210: power generating unit 220: feeding screw
300: heating unit 310: heating element
311: horizontal heating unit 312: vertical heating unit
320: protective cover 400: melting unit
410: molten metal 411: elution outlet

Claims (10)

A hopper part provided to input raw materials including waste catalyst powder and alkali agent;
A transfer unit provided to transfer the raw material to a predetermined position, and one end connected to the hopper portion;
A plurality of heat generating units are provided at the other end of the transfer unit, and made of a molten liquid by applying heat to the raw materials; And
It is provided below the other end of the transfer unit to accommodate the raw material, the melting unit is melted by the heat generation unit is stored in the melting unit; includes,
The heating unit,
A plurality of heating elements that dissipate heat toward the melting unit and are spaced apart at predetermined intervals; And
Includes a protective cover surrounding the heating element to prevent the flying material scattered from the melting unit from contacting the heating element;
The heating element,
A horizontal heating unit provided above the melting unit and arranged to be spaced apart a predetermined distance along a moving direction of the molten liquid; And
It is arranged to be spaced apart at predetermined intervals along the width direction and the length direction of the melting unit from the upper side of the upstream side of the melting unit where the melting liquid starts to be generated, to further provide heat to the upstream side of the melting unit, but scattered fine raw materials Including the vertical heating unit which is intersected with the horizontal heating unit and arranged in a height direction with respect to the melting unit to prevent particles and dust from accumulating on the outer surface.
Waste denitration catalyst melting device with heating element protection. delete According to claim 1,
The horizontal heating unit is provided in a plurality of layers spaced apart a predetermined distance along the height direction of the melting unit,
Waste denitration catalyst melting device with heating element protection. The method of claim 3,
The horizontal heating part, among the horizontal heating parts of the plurality of layers, the horizontal heating part of the upper layer is disposed between the horizontal heating parts of the lower layer,
Waste denitration catalyst melting device with heating element protection. According to claim 1,
The protective cover is provided to individually protect at least one of the horizontal heating part and the vertical heating part, respectively,
Waste denitration catalyst melting device with heating element protection. The method of claim 5,
The protective cover is configured to wrap while being spaced a predetermined distance from the outer surface so as not to contact with the outer surface of the horizontal heating part and the vertical heating part,
Waste denitration catalyst melting device with heating element protection. The method of claim 5,
The protective cover includes an aluminum component so that a protective film of Al ₂ O ₃ is formed on the inner and outer surfaces thereof.
Waste denitration catalyst melting device with heating element protection. The method of claim 7,
The protective cover further comprises at least one of iron and chromium,
Waste denitration catalyst melting device with heating element protection. According to claim 1,
The melting unit,
A molten metal extending in a direction away from the transfer unit from below the other end of the transfer unit so that the raw material and the molten liquid can be stored; And
Including the elution port provided at the end of the molten metal farthest from the other end of the transfer unit to discharge the melt to the outside of the molten metal;
Waste denitration catalyst melting device with heating element protection. The method of claim 9,
The transfer unit is provided in a plurality of spaced apart a predetermined distance to the hopper portion,
The elution port is provided in a plurality of spaced apart a predetermined distance to the end of the molten metal,
Waste denitration catalyst melting device with heating element protection.

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