CA2082147A1 - Melting furnace for the melting of mineral fibre raw material - Google Patents
Melting furnace for the melting of mineral fibre raw materialInfo
- Publication number
- CA2082147A1 CA2082147A1 CA002082147A CA2082147A CA2082147A1 CA 2082147 A1 CA2082147 A1 CA 2082147A1 CA 002082147 A CA002082147 A CA 002082147A CA 2082147 A CA2082147 A CA 2082147A CA 2082147 A1 CA2082147 A1 CA 2082147A1
- Authority
- CA
- Canada
- Prior art keywords
- melting furnace
- melting
- discharge opening
- raw material
- melt
- 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.)
- Abandoned
Links
- 238000002844 melting Methods 0.000 title claims abstract description 45
- 230000008018 melting Effects 0.000 title claims abstract description 45
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 23
- 239000011707 mineral Substances 0.000 title claims abstract description 23
- 239000002994 raw material Substances 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 title claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 238000010309 melting process Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 239000011490 mineral wool Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/26—Outlets, e.g. drains, siphons; Overflows, e.g. for supplying the float tank, tweels
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/26—Outlets, e.g. drains, siphons; Overflows, e.g. for supplying the float tank, tweels
- C03B5/262—Drains, i.e. means to dump glass melt or remove unwanted materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Inorganic Fibers (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
The invention concerns a melting furnace for the melting of mineral fibre raw material which furnace comprises a bottom part (1), sidewalls (2) and a cover (3), and supply means for the raw material. The melting furnace is provided with a discharge opening (4) in the sidewall (2) for mineral melt (8) at a distance from the bottom part (2) of the melting furnace, and a discharge opening (6) for emptying the melting furnace, at the level of the bottom part (2). The melting furnace further comprises an additional discharge opening (7) for discharging of iron melt (11) formed during the melting process provided in the sidewall (2) at a level above the discharge opening (6) for emptying the melting furnace, but at a level below the discharge opening (4) for the mineral melt (8).
Description
W~)91/17t25 1 S'Cr/FI')1/00127 ~' Melting furnace ~or the meltil)g of mineral fibre raw material This invention concerns a melting furnace for the melting o mineral fibre raw material, the furnace~comprisiny a bottom part, side walls and a cover, supply means ~or the raw materlal, as well as a discharge opening in the side wall for mineral melt arranged a-t a distance from thé
bottom part of the melting furnace, and a discharge opening for emptying the melting furnace, at the level of the bottom part.
Mineral wool products of glass wool, rock wool and slag wool type are the most well known and used products for both heat and acoustical insulation.
These products are made e.g. so that the raw material, such as rock mineral or slag rom iron production, are melted in a melting furnace. Mineral melt is withdrawn continuously from the furnace and converted to fibres e.g. in a spinning unit consisting of a plurality of rotating wheels, from which the mineral melt is spun under the formation of fibres. The thus formed fibres are transported with an air current from the spinning unit and collected onto a conveyor in the form of a fibre felt. The fibre felt is then subjected to further processing steps, e.g. impregna-tion with a binder, such as a resin, which in a final stage of the manufacturing proce~s is cured, e.g. in a curing -- -oven. During curing the fibres are'fixed to -each other-forming a form stable felt of the desired density and thickness. The c,ured ibre felt can thereafter e.g. be cut to the desired shape, such as sheet products or roll products, which thereafter are packed or processed further.
During the melting process, the iron oxide, or part . ~ ; .
. .
W091/171~ 2 0 8 ~
thereof, contained in the mineral raw material or the slag is reduced to metalllc lron and sinks to the bottom of the furnace in the form of an iron melt, whlch continuously increases in volume. In order to prevent iron melt from accompanying mineral melt in to t;he spinning unit, the iron melt has to be removed at regular intervals from the melting furnace. In the prior 3cnown melting furnaces the iron melt is removed through a discharge opening in the bottom of the melting furnace, whereby the iron melt is completely removed at each emptying operation. This method cf proceeding is used e.g. in the melting furnace according the FI-patent application no 853458.
The mineral melt formed during the melting process has a very corrosive effect on the walls of the melting furnace.
This results in the fact that the melting furnace on its inside has to be provided with an extremely corrosion resistant lining, which is both e~pensive and difficult to apply.
Tests made have shown that the iron melt which collects at the bottom of the melting furnace has a much gentler effect on the lining than the mineral melt. If it is possible -to prevent the iron melt from sinking below a predetermined level, it is possible to use in the bottom part of the melting furnace a much cheaper lining. This is achieved in the melting furnace according to the present invention by providing an additional discharge opening for discharging iron melt formed in the melting process, in the side wall at a level above the dlscharge opening for emptying the melting furnace, but at a level below the discharge opening for the mineral meltO With this solutlon the level of the iron melt is prevented from sinking below the level of the additional discharge opening. In order to ensure that the bottom part of the melting furnace as soon as possible after starting up the furnace is covered by a protective layer of iron melt, pig iron is added to the melting .
, '. ' , 2~ ` ~ 208 21~ 7 P~r/FI~Jl/(Jol27 furnace prior to starting the introduction of rock raw material.
The other characteristics of the invention appear from the appended Claims 1 to 6.
In the following the inventlon will be described in more detail referring to the drawing which shows schematically an esample of a melting furnace according to the invention~
The melting furnace comprises a bottom part 1, side walls 2 and a cover 3. A number of electrode rods 5, preferably of graphite, extend through the covex by means of which the raw material 9 is melted. I'his raw material 9 is introduced into the melting furnace by means of supply means (not shown ), which are arranged to distribute the rock raw material 9 in a substantially even layer over the mineral melt 8 formed during the melting process. Mineral melt 8 is withdrawn during the melting process in a constant flo~
from the melting furnace through a discharge opening 4 arranged in the side wall 2 to a spinning device (not shown) for the formation of mineral fibres. The discharge opening 4 is situated at a level at a distance from the bottom part 2 of the melting furnare. For emptying purposes the melting furnace is provided with a discharge opening 6 at the level of the bottom part 2. Above the discharge opening 6, there is arranged in the side wall 2 an addi-tional discharge opening 7 for discharging iron melt 11 formed during the melting process. This additional dischar-ge opening 7 is situated at a level lower than the dischar~
ge opening 4 for the mineral melt 8.
The two lower discharge openings 6 and 7 are suitably arranged in a common block, which according to a preferred embodiment is a carbon block divided into four parts, where the two outer parts, in which the respective discharge openings 6 and 7 are arranged, are replacable. The inside .. ..
.. . , :
, WO')1tl7125 : `~ . 2~) 8 2 ~ P~l1/FI~I/00l~7 of the block is preferably covered with a lining mix 10.
During the melting process some of the iron oxide in the raw material 9 is reduced to metallic iron which sinks to the bottom of the melting ~urnace and results in a steady increase of the amount of iron melt 11. The discharge openings 6 and 7 are normally closed and are opened only when necessary. In order to prevent the level of the iron melt from reaching the openin~ 4 for the mineral melt, excess iron melt has to be removed at regular intervalsO
Normally excess iron melt 11 is removed from the rnelting furnace at about 2 to 3 months intervals. The discharge opening 7 is then opened using a drilling machine or by burning with oxygen. When the desired quantity of iron melt 11 has been withdrawn from the furnace, the discharge opening 7 is closed using a mud gun (not shown) which has been precharged with heated sealing mud. The drawing shows the state when all excess iron melt has been removed. The discharge opening 6 is opened only when the whole melting furnace is to be emptied, e.g. for service or for renewing the lining. Opening of the discharge opening 6 takes most conveniently place by burning with oxygen.
.
, ~ - . .
. .
I
bottom part of the melting furnace, and a discharge opening for emptying the melting furnace, at the level of the bottom part.
Mineral wool products of glass wool, rock wool and slag wool type are the most well known and used products for both heat and acoustical insulation.
These products are made e.g. so that the raw material, such as rock mineral or slag rom iron production, are melted in a melting furnace. Mineral melt is withdrawn continuously from the furnace and converted to fibres e.g. in a spinning unit consisting of a plurality of rotating wheels, from which the mineral melt is spun under the formation of fibres. The thus formed fibres are transported with an air current from the spinning unit and collected onto a conveyor in the form of a fibre felt. The fibre felt is then subjected to further processing steps, e.g. impregna-tion with a binder, such as a resin, which in a final stage of the manufacturing proce~s is cured, e.g. in a curing -- -oven. During curing the fibres are'fixed to -each other-forming a form stable felt of the desired density and thickness. The c,ured ibre felt can thereafter e.g. be cut to the desired shape, such as sheet products or roll products, which thereafter are packed or processed further.
During the melting process, the iron oxide, or part . ~ ; .
. .
W091/171~ 2 0 8 ~
thereof, contained in the mineral raw material or the slag is reduced to metalllc lron and sinks to the bottom of the furnace in the form of an iron melt, whlch continuously increases in volume. In order to prevent iron melt from accompanying mineral melt in to t;he spinning unit, the iron melt has to be removed at regular intervals from the melting furnace. In the prior 3cnown melting furnaces the iron melt is removed through a discharge opening in the bottom of the melting furnace, whereby the iron melt is completely removed at each emptying operation. This method cf proceeding is used e.g. in the melting furnace according the FI-patent application no 853458.
The mineral melt formed during the melting process has a very corrosive effect on the walls of the melting furnace.
This results in the fact that the melting furnace on its inside has to be provided with an extremely corrosion resistant lining, which is both e~pensive and difficult to apply.
Tests made have shown that the iron melt which collects at the bottom of the melting furnace has a much gentler effect on the lining than the mineral melt. If it is possible -to prevent the iron melt from sinking below a predetermined level, it is possible to use in the bottom part of the melting furnace a much cheaper lining. This is achieved in the melting furnace according to the present invention by providing an additional discharge opening for discharging iron melt formed in the melting process, in the side wall at a level above the dlscharge opening for emptying the melting furnace, but at a level below the discharge opening for the mineral meltO With this solutlon the level of the iron melt is prevented from sinking below the level of the additional discharge opening. In order to ensure that the bottom part of the melting furnace as soon as possible after starting up the furnace is covered by a protective layer of iron melt, pig iron is added to the melting .
, '. ' , 2~ ` ~ 208 21~ 7 P~r/FI~Jl/(Jol27 furnace prior to starting the introduction of rock raw material.
The other characteristics of the invention appear from the appended Claims 1 to 6.
In the following the inventlon will be described in more detail referring to the drawing which shows schematically an esample of a melting furnace according to the invention~
The melting furnace comprises a bottom part 1, side walls 2 and a cover 3. A number of electrode rods 5, preferably of graphite, extend through the covex by means of which the raw material 9 is melted. I'his raw material 9 is introduced into the melting furnace by means of supply means (not shown ), which are arranged to distribute the rock raw material 9 in a substantially even layer over the mineral melt 8 formed during the melting process. Mineral melt 8 is withdrawn during the melting process in a constant flo~
from the melting furnace through a discharge opening 4 arranged in the side wall 2 to a spinning device (not shown) for the formation of mineral fibres. The discharge opening 4 is situated at a level at a distance from the bottom part 2 of the melting furnare. For emptying purposes the melting furnace is provided with a discharge opening 6 at the level of the bottom part 2. Above the discharge opening 6, there is arranged in the side wall 2 an addi-tional discharge opening 7 for discharging iron melt 11 formed during the melting process. This additional dischar-ge opening 7 is situated at a level lower than the dischar~
ge opening 4 for the mineral melt 8.
The two lower discharge openings 6 and 7 are suitably arranged in a common block, which according to a preferred embodiment is a carbon block divided into four parts, where the two outer parts, in which the respective discharge openings 6 and 7 are arranged, are replacable. The inside .. ..
.. . , :
, WO')1tl7125 : `~ . 2~) 8 2 ~ P~l1/FI~I/00l~7 of the block is preferably covered with a lining mix 10.
During the melting process some of the iron oxide in the raw material 9 is reduced to metallic iron which sinks to the bottom of the melting ~urnace and results in a steady increase of the amount of iron melt 11. The discharge openings 6 and 7 are normally closed and are opened only when necessary. In order to prevent the level of the iron melt from reaching the openin~ 4 for the mineral melt, excess iron melt has to be removed at regular intervalsO
Normally excess iron melt 11 is removed from the rnelting furnace at about 2 to 3 months intervals. The discharge opening 7 is then opened using a drilling machine or by burning with oxygen. When the desired quantity of iron melt 11 has been withdrawn from the furnace, the discharge opening 7 is closed using a mud gun (not shown) which has been precharged with heated sealing mud. The drawing shows the state when all excess iron melt has been removed. The discharge opening 6 is opened only when the whole melting furnace is to be emptied, e.g. for service or for renewing the lining. Opening of the discharge opening 6 takes most conveniently place by burning with oxygen.
.
, ~ - . .
. .
I
Claims (6)
1. Melting furnace for the melting of mineral fibre raw material which furnace comprises a bottom part (1), side walls (2) and a cover (3), supply means for the raw material, as well as a discharge opening (4) in the side wall (2) for mineral melt (8) at a distance from the bottom part (2) of the melting furnace, and a discharge opening (6) for emptying the melting furnace, at the level of the bottom part (2), characterized in that an additional discharge opening (7) for discharging of iron melt (11) formed during the melting process is provided in the side wall (2) at a level above the discharge opening (6) for emptying the melting furnace, but at a level below the discharge opening (4) for the mineral melt (8).
2. Melting furnace according to the Claim 1, characterized in that the two lower discharge openings (6, 7) are arranged in a common block.
3. Melting furnace according to the Claim 2, characterized in that the two lower discharge openings (6, 7) are normally closed and are opened by drilling and/or burning with oxygen.
4. Melting furnace according to the Claim 3, characterized in that the discharge opening (7) for iron melt (11) is closed with a mud gun.
5. Melting furnace according to the Claim 2, characterized in that the block is a carbon block divided into four parts the two outermost parts being replacable.
6. Melting furnace according to the Claim 5, characterized in that the block on the inside of the furnace is protected with a lining mix (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI902235A FI85262C (en) | 1990-05-04 | 1990-05-04 | Melting furnace for melting mineral fiber raw material |
| FI902235 | 1990-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2082147A1 true CA2082147A1 (en) | 1991-11-05 |
Family
ID=8530374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002082147A Abandoned CA2082147A1 (en) | 1990-05-04 | 1991-05-02 | Melting furnace for the melting of mineral fibre raw material |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0527169A1 (en) |
| AU (1) | AU7742991A (en) |
| CA (1) | CA2082147A1 (en) |
| FI (1) | FI85262C (en) |
| WO (1) | WO1991017125A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HUE046639T2 (en) | 2011-04-13 | 2020-03-30 | Rockwool Int | Processes for forming man made vitreous fibres |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL151861B (en) * | 1949-03-15 | Ampex | PHASE DISCRIMINATOR. | |
| AU520885B2 (en) * | 1978-10-17 | 1982-03-04 | Fletcher Challenge Limited | Glass melting |
-
1990
- 1990-05-04 FI FI902235A patent/FI85262C/en not_active IP Right Cessation
-
1991
- 1991-05-02 AU AU77429/91A patent/AU7742991A/en not_active Abandoned
- 1991-05-02 WO PCT/FI1991/000127 patent/WO1991017125A1/en not_active Application Discontinuation
- 1991-05-02 CA CA002082147A patent/CA2082147A1/en not_active Abandoned
- 1991-05-02 EP EP19910908389 patent/EP0527169A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991017125A1 (en) | 1991-11-14 |
| FI902235A (en) | 1991-11-05 |
| AU7742991A (en) | 1991-11-27 |
| EP0527169A1 (en) | 1993-02-17 |
| FI902235A0 (en) | 1990-05-04 |
| FI85262B (en) | 1991-12-13 |
| FI85262C (en) | 1992-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19941102 |