JP2013249995A - Metal case lining - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining to be installed on an inner wall of a furnace that stores molten metal of high temperature such as aluminum molten metal, with improved structural strength and durability, while improving workability in preparing the lining, and reducing manufacturing costs.SOLUTION: A lining installed on an inner wall of a furnace for molten metal, a metal case lining is configured by arranging a plurality of refractory-included metallic frame bodies provided with refractory formed by pouring water-mixed monolithic refractory into a hollow metallic frame body having a rectangular cross-section, and drying and solidifying it, while aligning directions of both end openings of the metallic frame bodies adjacent to each other, and having fixed upper end sections at one of both ends of the adjacent metallic frame bodies.

Description

  TECHNICAL FIELD The present invention relates to a lining attached to an inner wall of a furnace in which a high-temperature metal melt such as an aluminum melt is accommodated, and in particular, is in contact with an upper portion of an inner wall such as an aluminum melting furnace or an aluminum molten metal holding furnace, The present invention relates to a metal case lining that is suitable for use on an inner wall of a non-operating area.

  A furnace for a molten metal, for example, an inner wall of a furnace that contains a high-temperature molten metal such as an aluminum melting furnace or an aluminum molten metal holding furnace, a heat-resistant material such as a heat-resistant brick, for example, a heat-resistant brick having a high-temperature aluminum resistance. Conventionally, it is formed by stacking (Patent Documents 1 and 2).

  In this case, since the inner wall of the furnace is exposed to a high temperature, there is a risk that the individual bricks expand and contract, and the bricks protrude toward the inside of the furnace or collapse.

  In addition, when the inner wall of a furnace for molten metal is formed by stacking heat-resistant bricks as described above, skilled skills are required for brickwork, which reduces manufacturing costs associated with the work of skilled workers and improves workability. There was a problem that it was difficult to plan.

  Further, since the heat-resistant brick is eroded by the high-temperature molten metal, it is necessary to replace the heat-resistant brick after a predetermined period of use, and improvement in workability and cost as described above has been desired.

  The applicant of the present application has adhered to the inner wall of a furnace such as a waste incinerator or metal melting furnace, or the inner wall of a flue, etc. Have proposed a metal case lining that can effectively prevent deposition (Patent Document 3).

JP-A-10-237561 JP 2009-256176 A JP 2011-38721 A

      This invention improves the structural strength and durability of a lining attached to the inner wall of a furnace in which a high-temperature molten metal such as molten aluminum is accommodated, and improves workability when preparing such a lining. The object is to provide a lining that can improve and reduce manufacturing costs.

  In order to solve the above problems, the following invention is proposed.

The invention of claim 1
A lining arranged on the inner wall of a furnace for molten metal,
A refractory-encapsulating metal frame in which a refractory is formed by drying and solidifying an amorphous refractory by pouring water into an inside of a hollow metal frame having a rectangular cross section is formed of the metal frame adjacent to the metal frame. It is a metal case lining characterized in that a plurality of frame ends are aligned in parallel in the direction in which both end openings are directed, and upper end portions of one of both ends of the adjacent metal frame body are fixed to each other. .

The invention according to claim 2
The area of the inner wall of the furnace for the molten metal that is in contact with the molten metal is formed by a heat-resistant brick having resistance to high-temperature molten metal, and is an area above the area formed by the heat-resistant brick of the furnace This is a furnace for molten metal, characterized in that the lining is formed by the metal case lining according to claim 1.

    According to the present invention, the structural strength and durability of a lining attached to the inner wall of a furnace in which a high-temperature molten metal such as molten aluminum is accommodated is improved, and work for preparing such a lining is performed. It is possible to provide a lining that can improve performance and reduce manufacturing costs.

The perspective view showing an example of the metal frame body of the hollow cross-sectional rectangular shape which comprises the metal case lining of this invention. (A) A cross-sectional view omitting a part for explaining an example of a state in which the metal case lining of the present invention is disposed on the inner wall of the furnace, and (b) a part of FIG. 2 (a) is omitted. Plan view. (A) The front view which abbreviate | omitted one part explaining an example of the state by which the metal case lining of this invention was arrange | positioned at the inner wall of the furnace, and the lining was formed, (b) Under the lining formed in the inner wall of the furnace The front view which abbreviate | omitted one part explaining an example in the case of exchanging the firebrick which comprises the side. It is a figure showing the other example which arrange | positions the metal case lining of this invention on the inner wall of a furnace, Comprising: (a) The top view which abbreviate | omitted one part, (b) On the metal case lining shown in Fig.4 (a) FIG. 4C is a plan view showing a state in which the sheet ceramic is laid, FIG. 4B is a front view in the state of FIG. 4B, and FIG. 4D is a stack of upper metal case linings on the sheet ceramic shown in FIG. FIG.

    Hereinafter, an embodiment for carrying out the present invention will be described with reference to the accompanying drawings.

    The metal case lining 1 of the present invention is an inner wall of a furnace for molten metal, such as an aluminum melting furnace or an aluminum molten metal holding furnace, in particular, an upper wall of such a furnace, It is arranged at the opening of the furnace.

    The metal case lining 1 includes a hollow metal frame 2 having a rectangular cross section illustrated in FIG. 1, and a refractory 7 formed by filling the inside of the frame 2 as shown in FIG. It consists of.

    The refractory 7 is formed by kneading an amorphous refractory such as ceramic powder into the frame 2 and drying and solidifying the refractory 7. The refractory 7 is disposed throughout the frame 2.

    The metal frame 2 having a hollow and rectangular cross section is made of, for example, thin iron (for example, stainless steel) (thickness: 0.5 to 4.0 mm), length (L): 220 to 240 mm, high Length (H): 120 to 140 mm, width (W): about 120 to 140 mm.

    In the metal case lining 1 of the present invention, the refractory 7 is obtained by pouring a material obtained by kneading ceramic powder into the frame 2 and drying (for example, drying by heating and aeration drying) to solidify the ceramic. is there.

As the ceramic powder, as long as it is kneaded with water, poured into a predetermined mold, and dried and solidified, an amorphous refractory known in this technical field is used singly or in combination. be able to. For example, SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , SiC, or the like, or an amorphous refractory mixed with mullite, microsilica, alumina cement, or the like can be used. For example, the drying may be performed at 350 ° C. to 400 ° C. for 30 to 40 hours.

  As described above, the refractory 7 obtained by kneading an amorphous refractory (ceramic powder), pouring it into the frame 2 and drying and solidifying it is superior to the refractory bricks and heat-resistant bricks conventionally used. It exhibits excellent elastoplastic fracture toughness and thermal shock resistance, and can suppress adhesion and deposition of molten metal.

  In the present invention, the hollow and metal frame 2 serves as a mold (form), and as described above, an amorphous refractory (ceramic powder) is kneaded with water, and this is a hollow, rectangular frame. The metal frame 2 containing the refractory 7 can be prepared by pouring into the body 2 and molding.

  Thus, the metal case lining 1 of the present invention in which the refractory 7 is filled in the inside of the frame 2 made of metal and having a rectangular cross section is prepared.

  FIG. 2A shows a metal case lining 1 of the present invention comprising a metal frame 2 containing a refractory 7 prepared as described above, and is arranged on the inner wall of the furnace to form a lining. FIG. 2B is a cross-sectional view in which a part of the state is omitted, and FIG. 2B is a plan view in which part of FIG. 2A is omitted.

  In the illustrated embodiment, the furnace wall 10 is formed of an iron plate 11 such as a preheater iron plate and a plurality of heat insulating material layers 10a, 10b, and 10c from the outside.

  Among the linings formed on the inner wall of the furnace wall 10, the lining in the region that comes into contact with the molten metal (for example, molten aluminum) accommodated in the furnace has resistance to the high-temperature molten metal, It is made of heat-resistant brick 12 (for example, heat-resistant brick having high-temperature aluminum resistance).

  And the lining of the area | region above the area | region where the lining is formed with the heat-resistant brick 12 corresponding to the inner wall upper part or opening part of a furnace consists of the metal frame 2 which contains the refractory 7 in this invention. The metal case lining 1 is formed.

  It is not desirable that the metal frame 2 constituting the metal case lining 1 of the present invention is directly immersed in a high-temperature molten metal.

  As shown in FIGS. 2 (a), 2 (b), 3 (a), and 4 (a), a plurality of metal case linings 1 are aligned in the direction in which both end openings 8 and 9 of adjacent frame bodies 2 are directed. These are arranged in parallel, and the end portions on the upper side at one of the two ends of the adjacent frame bodies 2 are fixed by welding.

  That is, end portions 6a on the upper side of the end portion of the frame body 2 on the side in contact with the inner wall surface of the furnace wall 10 are fixed by welding, and in the illustrated embodiment, a welded portion 13 is formed.

  Thus, the work which fixes the edge part 6a of the upper side in one side of the both ends of the adjacent frame 2 arrange | positioned in parallel by aligning the direction which the both ends opening 8 and 9 of the adjacent frame 2 faces is welded As shown in FIG. 2B, a plurality of metal case linings 1 are arranged adjacent to each other in the horizontal direction.

  Thus, on the heat-resistant brick 12 laminated as shown in FIGS. 2 (a) and 3 (a), the left-right direction of the inner wall surface of the furnace wall 10 (the left-right direction in FIG. 2 (b), FIG. If the plurality of metal case linings 1 and 1 are arranged and fixed in the left and right direction in FIG. 2 (b), then the left and right direction of the inner wall surface of the furnace wall 10 is A plurality of metal case linings 1 and 1 are arranged and fixed in the direction (left and right direction in FIG. 3A) to form the lining as shown in FIGS. 2A and 3A.

  When the inner walls of conventional aluminum melting furnaces, molten aluminum holding furnaces, etc. are formed with heat-resistant bricks 12, they are stacked one by one via jointing agents, so that skill in brick building is required and workability is improved. However, it is difficult to reduce the manufacturing cost because it is a work by skilled workers.

    In the present invention, an amorphous refractory material is kneaded with water, poured into a hollow frame 2 having a rectangular cross section, and prepared by molding, a metal made of a metal frame 2 containing a refractory 7. A plurality of case linings 1 are stacked on the laminated heat-resistant bricks 12 with the direction in which both end openings 8 and 9 of the adjacent frame 2 are directed, and the upper end of one of the both ends of the adjacent frame 2 is stacked. The inner lining of the furnace wall 10 can be formed simply by fixing the upper ends 6a of the ends of the frame 2 on the side contacting the inner wall surface of the furnace wall 10 by welding. it can.

  Therefore, brickwork technology and skill to form a lining by stacking conventional heat-resistant bricks 12 are no longer necessary, and workability and workability to form linings for inner walls of aluminum melting furnaces, aluminum melt holding furnaces, etc. are improved. Therefore, the manufacturing cost can be reduced.

  Further, when the inner wall of the aluminum melting furnace or the molten aluminum holding furnace is formed by stacking the heat-resistant bricks 12 as in the prior art, the inner wall of the furnace is exposed to a high temperature as described above. There was a risk that the brick would protrude toward the inside of the furnace or collapse due to expansion and contraction.

    The lining formed as described above by the metal case lining 1 of the present invention has the frame body 2 on the side contacting the inner wall surface of the furnace wall 10, that is, the upper end portions at one of both ends of the adjacent frame bodies 2. Since the end portions 6a on the upper side of the end portions are fixed by welding, the structural strength and durability of the furnace are improved, and even if the inner wall of the furnace is exposed to a high temperature, the metal case lining 1 remains in the furnace. Can be effectively prevented from collapsing.

  4A to 4D, a plurality of metal case linings 1 are arranged adjacent to each other and fixed by welding (FIG. 4A) so as to cover each upper wall 6. A thin sheet-like ceramic 18 is laid on each other (FIGS. 4B and 4C), and a plurality of metal case linings 1 constituting the upper stage are arranged adjacent to the sheet-like ceramic 18 and welded. -It may be fixed to form a lining (Fig. 4 (d)). The reason why the sheet-like ceramic 18 is used is to eliminate an arrangement error due to unevenness that may be caused by arranging a plurality of metal case linings 1 adjacent to each other vertically and horizontally.

  When the inner wall of a conventional aluminum melting furnace or aluminum molten metal holding furnace is formed of the heat-resistant brick 12, it is necessary to replace the refractory brick 12 constituting the inner wall of the furnace. For example, among the refractory bricks 12 constituting the inner wall of the furnace, the refractory bricks 12 arranged in a region in contact with the molten aluminum may be eroded by the high-temperature molten aluminum. After that, it needs to be replaced. At that time, the heat-resistant brick 12 arranged on the upper side, for example, the heat-resistant brick 12 arranged at the position corresponding to the upper part of the inner wall of the furnace or the opening which is not in contact with the molten aluminum is being replaced. In order not to collapse, it was necessary to take various measures and risk prevention measures.

  According to the present invention, the upper and lower linings of the upper and lower tiers are connected to the upper ends of one of the ends of the adjacent frames 2, that is, the ends of the frame 2 on the side contacting the inner wall surface of the furnace wall 10. The end portions 6a on the upper side of the section are fixed by welding, and by the plurality of metal case linings 1 and 1 thus formed, the left and right direction of the inner wall surface of the furnace wall 10 (the left and right direction in FIG. 2 (b), The lining which covers the left-right direction in Fig.3 (a) is formed.

  Therefore, when the heat-resistant brick 12 forming the lining in the lower region than the lining formed by the metal case linings 1, 1 is extracted for replacement, etc., the upper metal case lining 1, It is no longer necessary to take measures and danger prevention measures to prevent the lining consisting of 1 from collapsing.

  That is, as shown in FIG. 3B, when the gap 17 is formed at a place where the heat-resistant brick 12 is replaced, the left-right direction of the inner wall surface of the furnace wall 10 (the left-right direction in FIG. 2B, FIG. The assembly of the plurality of metal case linings 1 and 1 covering the left and right direction in a) tends to bend as a whole in the direction of the arrow 15 by gravity acting on the center of gravity G.

  Thereby, of the left and right walls 3, 5 of the frame 2 that forms both side walls of the adjacent metal case lining 1, the metal case lining 1 that contacts the left and right furnace walls 14, 14 orthogonal to the furnace wall 10. Each of the left and right walls 3 and 5 presses against the furnace walls 14 and 14 while being inclined in an oblique direction according to the gravity acting on the center of gravity G. Thereby, in FIG.3 (b), there is no possibility that the lining which consists of several metal case linings 1 and 1 arrange | positioned on the space | gap 17 may fall. Then, when performing the operation | work which replaces the refractory brick 12 arrange | positioned in the area | region which contacts aluminum molten metal, it is arrange | positioned in the position applicable to the inner wall upper part and opening part of the furnace which are the areas which are not in contact with molten aluminum. In order to prevent the metal case linings 1 and 1 of the present invention from collapsing, it is not necessary to take special measures or risk prevention measures. As a result, the work efficiency can be improved and the cost required for replacing the refractory brick 12 can be reduced.

  The preferred embodiments and examples of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to these, and various forms are possible within the technical scope grasped from the description of the claims. Can be changed.

DESCRIPTION OF SYMBOLS 1 Metal case lining 2 Hollow cross-section rectangular frame 3 Wall on the left side of the frame 4 Lower wall on the frame 5 Wall on the right side of the frame 6 Upper wall on the frame 6a One of both ends of the metal case lining Upper side end 7 Refractories 8 and 9 Opening of frame 10 Furnace wall 10a First heat insulating layer 10b Second heat insulating layer 10c Third heat insulating layer 11 Iron plate 12 Heat-resistant brick 13 Welded part 14 Furnace wall 17 Void 18 Sheet-like Ceramic

Claims (2)

A lining arranged on the inner wall of a furnace for molten metal,
A refractory-encapsulating metal frame in which a refractory is formed by drying and solidifying an amorphous refractory by pouring water into an inside of a hollow metal frame having a rectangular cross section is formed of the metal frame adjacent to the metal frame. A metal case lining, wherein a plurality of frame ends are aligned in parallel in a direction in which both end openings are directed, and upper end portions of one of both ends of the adjacent metal frame body are fixed to each other. The area of the inner wall of the furnace for the molten metal that is in contact with the molten metal is formed by a heat-resistant brick having resistance to high-temperature molten metal, and is an area above the area formed by the heat-resistant brick of the furnace A furnace for a molten metal, characterized in that the lining is formed by the metal case lining according to claim 1.

Images