GB2121150A - Linings for molten metal holders - Google Patents

Linings for molten metal holders Download PDF

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Publication number
GB2121150A
GB2121150A GB08215496A GB8215496A GB2121150A GB 2121150 A GB2121150 A GB 2121150A GB 08215496 A GB08215496 A GB 08215496A GB 8215496 A GB8215496 A GB 8215496A GB 2121150 A GB2121150 A GB 2121150A
Authority
GB
United Kingdom
Prior art keywords
boards
lining
molten metal
secondary lining
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08215496A
Other versions
GB2121150B (en
Inventor
Robert Daniel Thomas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Morganite Thermal Designs Ltd
Original Assignee
Morganite Thermal Designs Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Morganite Thermal Designs Ltd filed Critical Morganite Thermal Designs Ltd
Priority to GB08215496A priority Critical patent/GB2121150B/en
Priority to JP9263183A priority patent/JPS58224289A/en
Publication of GB2121150A publication Critical patent/GB2121150A/en
Application granted granted Critical
Publication of GB2121150B publication Critical patent/GB2121150B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/12—Working chambers or casings; Supports therefor
    • F27B3/14—Arrangements of linings
    • 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
    • F27D1/0009—Comprising ceramic fibre elements
    • 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
    • F27B14/12—Covers therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

A molten metal holder such as a furnace is provided with a lining of thermal insulating refractory material comprising an inner lining, made from boards (8) of a high refractory material to withstand contact by molten metal and a secondary lining (5, 7) behind the inner lining consisting of refractory material, e.g. refractory fibre and cement, formed in situ as a monolithic layer which may further be built up in two layer stages (5, 7). The first layer (5) is applied between a former and boards 4, whereas the second layer 7 is applied between the first layer and boards 8. <IMAGE>

Description

SPECIFICATION Molten metal holder This invention relates to molten metal holders, especially smelting, holding or dosing furnaces but including other vessels, including chutes, for molten metal.
The invention is concerned with the lining of molten metal holders with thermal insulating refractory material, to conserve the heat and withstand the high temperature of molten metal.
Furnaces can be built by well established methods and lined with refractory bricks capable of giving satisfactory results but at considerable cost for labour and materials and limitations of site as well as the risk of failure through cracking or other defects arising in starting up.
More economicai and adaptable constructions utilise lighter fabricated furnace structures with linings made from plates or boards of ceramic material. Difficulties are however experienced due to penetration, if not actual leakage, of molten metal through the joints, where lining plates or boards meet, or through cracks which appear in the lining plates or boards in use. This causes loss of heat and possibly failure of or serious damage to the structure.
According to the present invention, in a molten metal holder having an inner lining made from boards, or like members, of a high refractory material to withstand contact by the molten metal, there is provided behind the inner lining a secondary lining of a refractory material, preferably a mixture of refractory fibre and cement, formed in situ as a monolithic layer.
Such a monolithic secondary lining covers or closes externally joints or cracks in the board inner lining and, even though it may be contacted by molten metal penetrating such joints or cracks, the secondary lining is not exposed to the full atmospheric corrosive effect of the molten metal because there is substantially no access for oxygen to react with molten metal at the secondary lining surface.
The secondary lining material may be applied in situ, to the inner surface of the vessel or structure of the furnace or other holder, in any convenient manner but preferably a chambershaped first layer of the secondary lining is first cast in place, using a removable former of bath shape, held spaced from the inner surface of the vessel or structure by less than the required thickness to which the secondary lining is to be cast.
A second, inner, layer of the secondary lining material is then cast or rammed in place to complete the secondary lining to the required chamber wali thickness and this may be done with or without a casting former. Shuttering may be used to define the total thickness of secondary lining to be cast or rammed in place and such shuttering may be provided by a casting former or by the inner lining boards themselves put in place, and supported as required, after casting of the first layer of secondary lining material.
The inner lining boards may be of high density, fibre reinforced, pressed calcium silicate boards, such as those available under the Trade Mark "MONOLITE" a Cape Asbestos Company product.
The preferred secondary lining material is a mixture of chopped ceramic fibre, such as "TRITON" (Trade Mark) a product of Morganite Ceramic Fibres Limited, and a high alumina refractory cement in the proportions of fibre to cement 2:1 by weight.
The inner lining boards may be secured in place by interfitting one with another, and/or may be cemented to the secondary lining, and may be fixed by stainless steel screws. Joints between boards are filled with a refractory sealant, for example asbestos tape packing.
The invention is illustrated by way of example on the accompanying drawing which shows in vertical section a molten aluminium holding furnace.
The furnace shown has casing consisting of a metal outer frame 1, which is supported by a metal stand or other base (not shown), with boards 2, of thermal insulating material of structural strength, forming the walls of the casing. Suitable material for the boards 2 is a medium density calcium silicate, such as "MONOLUX 500" (Trade Mark) a product of Cape Asbestos Company.
The main thermal insulation consists of a double layer of thick sheets 3 of, for example, low density calcium silicate and this is in turn lined by boards 4, of structural strength, of a fibrous refractory material, such as "TRITON" ceramic fibre board.
The boards 4 provide a strong shell for the casting of the first layer 5 of secondary lining material, to the thickness indicated by the line 6, and the total thickness of secondary lining material is then completed by a second layer 7.
The inner lining boards 8 are installed, before or after completion of the second layer 7 of the secondary lining. The inner lining boards 8 are secured in place by any suitable fixing, such as stainless steel screws, and joints 9 are packed with asbestos tape.
The furnace has a removable cover 10, of corresponding or modified layered construction to the metal holding chamber, which rests on a seal 11.
Other features of the furnace are optional and do not form part of the invention.
1. A molten metal holder having an inner lining made from boards of high refractory material and having, behind the inner lining, a secondary lining formed in situ as a monolithic layer.
2. A molten metal holder according to claim 1, in which the secondary lining is made of a mixture of refractory fibre and cement.
3. A method of making a molten metal holder according to claim 1 or 2, in which a chambershaped first layer of the secondary lining is first cast in place, using a removable former to define
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Molten metal holder This invention relates to molten metal holders, especially smelting, holding or dosing furnaces but including other vessels, including chutes, for molten metal. The invention is concerned with the lining of molten metal holders with thermal insulating refractory material, to conserve the heat and withstand the high temperature of molten metal. Furnaces can be built by well established methods and lined with refractory bricks capable of giving satisfactory results but at considerable cost for labour and materials and limitations of site as well as the risk of failure through cracking or other defects arising in starting up. More economicai and adaptable constructions utilise lighter fabricated furnace structures with linings made from plates or boards of ceramic material. Difficulties are however experienced due to penetration, if not actual leakage, of molten metal through the joints, where lining plates or boards meet, or through cracks which appear in the lining plates or boards in use. This causes loss of heat and possibly failure of or serious damage to the structure. According to the present invention, in a molten metal holder having an inner lining made from boards, or like members, of a high refractory material to withstand contact by the molten metal, there is provided behind the inner lining a secondary lining of a refractory material, preferably a mixture of refractory fibre and cement, formed in situ as a monolithic layer. Such a monolithic secondary lining covers or closes externally joints or cracks in the board inner lining and, even though it may be contacted by molten metal penetrating such joints or cracks, the secondary lining is not exposed to the full atmospheric corrosive effect of the molten metal because there is substantially no access for oxygen to react with molten metal at the secondary lining surface. The secondary lining material may be applied in situ, to the inner surface of the vessel or structure of the furnace or other holder, in any convenient manner but preferably a chambershaped first layer of the secondary lining is first cast in place, using a removable former of bath shape, held spaced from the inner surface of the vessel or structure by less than the required thickness to which the secondary lining is to be cast. A second, inner, layer of the secondary lining material is then cast or rammed in place to complete the secondary lining to the required chamber wali thickness and this may be done with or without a casting former. Shuttering may be used to define the total thickness of secondary lining to be cast or rammed in place and such shuttering may be provided by a casting former or by the inner lining boards themselves put in place, and supported as required, after casting of the first layer of secondary lining material. The inner lining boards may be of high density, fibre reinforced, pressed calcium silicate boards, such as those available under the Trade Mark "MONOLITE" a Cape Asbestos Company product. The preferred secondary lining material is a mixture of chopped ceramic fibre, such as "TRITON" (Trade Mark) a product of Morganite Ceramic Fibres Limited, and a high alumina refractory cement in the proportions of fibre to cement 2:1 by weight. The inner lining boards may be secured in place by interfitting one with another, and/or may be cemented to the secondary lining, and may be fixed by stainless steel screws. Joints between boards are filled with a refractory sealant, for example asbestos tape packing. The invention is illustrated by way of example on the accompanying drawing which shows in vertical section a molten aluminium holding furnace. The furnace shown has casing consisting of a metal outer frame 1, which is supported by a metal stand or other base (not shown), with boards 2, of thermal insulating material of structural strength, forming the walls of the casing. Suitable material for the boards 2 is a medium density calcium silicate, such as "MONOLUX 500" (Trade Mark) a product of Cape Asbestos Company. The main thermal insulation consists of a double layer of thick sheets 3 of, for example, low density calcium silicate and this is in turn lined by boards 4, of structural strength, of a fibrous refractory material, such as "TRITON" ceramic fibre board. The boards 4 provide a strong shell for the casting of the first layer 5 of secondary lining material, to the thickness indicated by the line 6, and the total thickness of secondary lining material is then completed by a second layer 7. The inner lining boards 8 are installed, before or after completion of the second layer 7 of the secondary lining. The inner lining boards 8 are secured in place by any suitable fixing, such as stainless steel screws, and joints 9 are packed with asbestos tape. The furnace has a removable cover 10, of corresponding or modified layered construction to the metal holding chamber, which rests on a seal 11. Other features of the furnace are optional and do not form part of the invention. CLAIMS
1. A molten metal holder having an inner lining made from boards of high refractory material and having, behind the inner lining, a secondary lining formed in situ as a monolithic layer.
2. A molten metal holder according to claim 1, in which the secondary lining is made of a mixture of refractory fibre and cement.
3. A method of making a molten metal holder according to claim 1 or 2, in which a chambershaped first layer of the secondary lining is first cast in place, using a removable former to define the required thickness and shape, and then an additional layer of the secondary lining is then cast in place to complete the secondary lining to the required thickness.
4. A method according to claim 3, in which the inner lining boards are used as shuttering for casting of the additional layer of the secondary lining.
5. A molten metal holder substantially as described with reference to the accompanying drawing.
GB08215496A 1982-05-27 1982-05-27 Linings for molten metal holders Expired GB2121150B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08215496A GB2121150B (en) 1982-05-27 1982-05-27 Linings for molten metal holders
JP9263183A JPS58224289A (en) 1982-05-27 1983-05-27 Holding vessel for molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08215496A GB2121150B (en) 1982-05-27 1982-05-27 Linings for molten metal holders

Publications (2)

Publication Number Publication Date
GB2121150A true GB2121150A (en) 1983-12-14
GB2121150B GB2121150B (en) 1985-11-13

Family

ID=10530671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08215496A Expired GB2121150B (en) 1982-05-27 1982-05-27 Linings for molten metal holders

Country Status (2)

Country Link
JP (1) JPS58224289A (en)
GB (1) GB2121150B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675879A (en) * 1984-04-07 1987-06-23 Foseco Trading A.G. Induction furnaces

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7084061B1 (en) * 2021-03-25 2022-06-14 株式会社トウネツ Metal molten metal furnace

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1312150A (en) * 1970-08-14 1973-04-04 Dynamit Nobel Ag Metallurgical furnaces or vessels
GB1364665A (en) * 1971-12-07 1974-08-29 Foseco Trading Ag Tundishes
GB1469513A (en) * 1973-07-30 1977-04-06 Foseco Trading Ag Tundishes
GB1488614A (en) * 1974-03-23 1977-10-12 Doerentruper Sand & Thonwerk Method of lining a melting furance with a refractory lining and apparatus for carrying out the method
GB1506506A (en) * 1975-08-08 1978-04-05 Foseco Trading Ag Tundishes
GB1537739A (en) * 1976-12-07 1979-01-04 Foseco Trading Ag Molten metal handling vessels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1312150A (en) * 1970-08-14 1973-04-04 Dynamit Nobel Ag Metallurgical furnaces or vessels
GB1364665A (en) * 1971-12-07 1974-08-29 Foseco Trading Ag Tundishes
GB1469513A (en) * 1973-07-30 1977-04-06 Foseco Trading Ag Tundishes
GB1488614A (en) * 1974-03-23 1977-10-12 Doerentruper Sand & Thonwerk Method of lining a melting furance with a refractory lining and apparatus for carrying out the method
GB1506506A (en) * 1975-08-08 1978-04-05 Foseco Trading Ag Tundishes
GB1537739A (en) * 1976-12-07 1979-01-04 Foseco Trading Ag Molten metal handling vessels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675879A (en) * 1984-04-07 1987-06-23 Foseco Trading A.G. Induction furnaces

Also Published As

Publication number Publication date
JPS58224289A (en) 1983-12-26
GB2121150B (en) 1985-11-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940527