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WO2000053986A1 - A method for the manufacture of a melt launder and a launder manufactured by this method - Google Patents

A method for the manufacture of a melt launder and a launder manufactured by this method Download PDF

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Publication number
WO2000053986A1
WO2000053986A1 PCT/FI2000/000144 FI0000144W WO0053986A1 WO 2000053986 A1 WO2000053986 A1 WO 2000053986A1 FI 0000144 W FI0000144 W FI 0000144W WO 0053986 A1 WO0053986 A1 WO 0053986A1
Authority
WO
WIPO (PCT)
Prior art keywords
launder
melt
melt launder
cooling water
water channels
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.)
Ceased
Application number
PCT/FI2000/000144
Other languages
French (fr)
Inventor
Kaarle Peltoniemi
Pekka SETÄLÄ
Juha Piispanen
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Priority to AU28089/00A priority Critical patent/AU2808900A/en
Publication of WO2000053986A1 publication Critical patent/WO2000053986A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/14—Discharging devices, e.g. for slag
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
    • F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water

Definitions

  • the present invention relates to a method of manufacturing a melt launder, where the launder is used to discharge molten material, particularly molten slag from metal production, from a smelting furnace.
  • the launder In cross-section the launder is of curved and uniform shape, made of worked copper billet and equipped with cooling piping at the edges.
  • the invention also relates to a melt launder manufactured by this method.
  • Discharge launders made of brick and fireproof material are used for the discharge of molten matte or raw metal such as blister copper from a smelting furnace, but a discharge launder for molten slag can also be manufactured from copper, since the slag does not react with the launder material.
  • discharge launders were fabricated from many longitudinal pieces: base plate and edge plates. Only the edge plates are normally equipped with cooling water circulation, because of the desire to eliminate the possibility of water coming into contact with the molten material and causing the risk of explosion, should the base plate break under severe strain.
  • a blast furnace slag launder known in the prior art is described in the German patent publication 31 01 788, which launder is manufactured by casting it into a trough form.
  • the base of the trough is also equipped with cooling water piping.
  • the cooling water piping is formed by casting copper on top of it.
  • a discharge launder has now been developed, which in cross-section is of curved and uniform shape, made from worked copper or copper alloy billet and equipped at the edges with cooling piping.
  • the cooling piping is located in the edge parts above the calculated surface of the molten metal, so that there is no chance whatsoever of the water coming into contact with the molten material.
  • the launder is fabricated from slipcast and worked copper plate by bending it into a curve. Preferably one edge is higher than the other, in order to prevent the molten material flowing over the edge even when it is fed partly from the side.
  • the invention also relates to a launder manufactured by this method. The essential features of the invention will become apparent in the attached patent claims.
  • the discharge launder billet is preferably manufactured by slip-casting, and the billet is worked e.g. by rolling, whereby it is strengthened.
  • the rolled billet is bent into the desired shape, preferably curved so that one edge is higher than the other.
  • the advantage of worked copper billet compared to a cast structure is that in melt launder conditions, no grain growth and only the slightest amount of other deformation reactions have been observed in the worked billet, whereas deformations do occur in cast structure melt launders.
  • the melt launder manufactured by this method is very suitable for the discharge of the molten slag formed in the production of copper from the furnace.
  • Figure 1 shows a melt launder 1 , which in this case is formed of two sections 2 and 3, where the joint surfaces are transverse in relation to the length of the launder.
  • the sections are joined to each other with an overlapping joint 4.
  • the launder is supported from the outside by reinforcements 5.
  • Figure 2 shows how the reinforcement is attached to the melt launder, in this case with bolts 6, but clearly it can be done by some other suitable method.
  • the drawing also shows that one edge of the launder is made higher than the other, so that the discharging of the melt can also be made from the lower edge of the launder, thus preventing the smelt from splashing over the edge.
  • the launder cooling water channels 7 are connected to a cooling water assembly 8.
  • the cooling water channels are formed either during slip casting or by boring longitudinal holes in the side sections of the rolled and bent launder billet.
  • the advantage of bored holes is that there are only half as many holes to be plugged in this kind of piping than in channels made for instance during slip casting.
  • the number of points of discontinuity such as plugs are as few as possible.
  • the cooling water assembly to the piping are usually brought from elsewhere than directly from the boring point.
  • the inner surface of the cooling piping can be grooved into a pattern, thus obtaining an increased heat transfer surface compared with a smooth pipe, without having to increase the amount of cooling water.
  • the length of the required discharge launder is such that the launder has to be fabricated from more than one section, the necessary number of essentially identical sections are joined together.
  • the joining points are strengthened as needed, for instance, with external brace reinforcements and bolted joints.
  • the joint surfaces are machined to overlap each other in order to minimize the risk of melt leakages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a method for manufacturing of a melt launder, wherein said launder is used to discharge molten material, especially molten slag from a smelting furnace in which the slag is generated during the production of metals. The launder is formed from uniform, worked copper billet, curved in cross-section, and equipped with cooling piping at the edges. The invention also relates to a melt launder manufactured by this method.

Description

A METHOD FOR THE MANUFACTURE OF A MELT LAUNDER AND A LAUNDER MANUFACTURED BY THIS METHOD
The present invention relates to a method of manufacturing a melt launder, where the launder is used to discharge molten material, particularly molten slag from metal production, from a smelting furnace. In cross-section the launder is of curved and uniform shape, made of worked copper billet and equipped with cooling piping at the edges. The invention also relates to a melt launder manufactured by this method.
Discharge launders made of brick and fireproof material are used for the discharge of molten matte or raw metal such as blister copper from a smelting furnace, but a discharge launder for molten slag can also be manufactured from copper, since the slag does not react with the launder material. Earlier, discharge launders were fabricated from many longitudinal pieces: base plate and edge plates. Only the edge plates are normally equipped with cooling water circulation, because of the desire to eliminate the possibility of water coming into contact with the molten material and causing the risk of explosion, should the base plate break under severe strain.
The disadvantage of a launder made from several longitudinal sections is that, although the pieces are joined together with the tightest possible joints, at high temperatures the launder sections move in relation to each other and thus gaps form between the sections, which cause melt leakages. Gaps form when the base plate which has a higher temperature than the edge plates, shrinks due to grain growth or some other deformation in the copper. The cross-section of a launder made from several longitudinal sections is angular and this is not advantageous for cleaning the launder. Some of the reinforcement supports have to extend into the inside of the launder and again this makes cleaning difficult. A blast furnace slag launder known in the prior art is described in the German patent publication 31 01 788, which launder is manufactured by casting it into a trough form. The base of the trough is also equipped with cooling water piping. The cooling water piping is formed by casting copper on top of it.
According to this invention a discharge launder has now been developed, which in cross-section is of curved and uniform shape, made from worked copper or copper alloy billet and equipped at the edges with cooling piping. The length of launder to be used and the process technology dictate whether the launder has to be manufactured from several sections. For safety reasons, the cooling piping is located in the edge parts above the calculated surface of the molten metal, so that there is no chance whatsoever of the water coming into contact with the molten material. The launder is fabricated from slipcast and worked copper plate by bending it into a curve. Preferably one edge is higher than the other, in order to prevent the molten material flowing over the edge even when it is fed partly from the side. The invention also relates to a launder manufactured by this method. The essential features of the invention will become apparent in the attached patent claims.
As mentioned above, the discharge launder billet is preferably manufactured by slip-casting, and the billet is worked e.g. by rolling, whereby it is strengthened. The rolled billet is bent into the desired shape, preferably curved so that one edge is higher than the other. The advantage of worked copper billet compared to a cast structure is that in melt launder conditions, no grain growth and only the slightest amount of other deformation reactions have been observed in the worked billet, whereas deformations do occur in cast structure melt launders. The melt launder manufactured by this method is very suitable for the discharge of the molten slag formed in the production of copper from the furnace.
The invention is described in the attached principle diagrams, where Figure 1 shows a melt launder from the side, and Figure 2 shows a cross-section of the launder.
Figure 1 shows a melt launder 1 , which in this case is formed of two sections 2 and 3, where the joint surfaces are transverse in relation to the length of the launder. The sections are joined to each other with an overlapping joint 4. The launder is supported from the outside by reinforcements 5.
Figure 2 shows how the reinforcement is attached to the melt launder, in this case with bolts 6, but clearly it can be done by some other suitable method. The drawing also shows that one edge of the launder is made higher than the other, so that the discharging of the melt can also be made from the lower edge of the launder, thus preventing the smelt from splashing over the edge. The launder cooling water channels 7 are connected to a cooling water assembly 8.
The cooling water channels are formed either during slip casting or by boring longitudinal holes in the side sections of the rolled and bent launder billet. The advantage of bored holes is that there are only half as many holes to be plugged in this kind of piping than in channels made for instance during slip casting. When the melt launder is in direct contact with the molten slag, it is preferable that the number of points of discontinuity such as plugs are as few as possible. The cooling water assembly to the piping are usually brought from elsewhere than directly from the boring point. The inner surface of the cooling piping can be grooved into a pattern, thus obtaining an increased heat transfer surface compared with a smooth pipe, without having to increase the amount of cooling water.
If the length of the required discharge launder is such that the launder has to be fabricated from more than one section, the necessary number of essentially identical sections are joined together. The joining points are strengthened as needed, for instance, with external brace reinforcements and bolted joints. The joint surfaces are machined to overlap each other in order to minimize the risk of melt leakages. The advantage of a launder which is uniform in cross-section is just the fact that all the support can be placed on the outside of the launder, whereas in the launders used earlier, made of several longitudinal sections, part of the launder support had to be placed also inside, which made it extremely difficult to clean the launder.

Claims

PATENT CLAIMS
1. Method of manufacturing a melt launder used for the discharge of slag formed in the production of metals, whereby the launder is made of copper or copper alloy and is curved in cross-section, characterized in that the melt launder, which is uniform in cross-section, is manufactured of slip cast and worked billet, which is bent into a curve and that the edge parts above the calculatory melt surface are equipped with a cooling water channels.
2. Method according to claim 1 , characterized in that one edge of the melt launder is formed higher than the other.
3. Method according to claim 1 , characterized in that the cooling water channels are fabricated by boring.
4. Method according to claim 1 , characterized in that the cooling water channels are fabricated during slip casting.
5. Method according to any of the preceding claims, characterized in that the inner surface of the cooling water channels is grooved into a pattern.
6. Method according to claim 1 , characterized in that the working of the melt launder billet is done by rolling.
7. Method according to claim 1 , characterized in that the melt launder is equipped with support reinforcement.
8. Method according to claim 1 , characterized in that the melt launder is made up of several sections, the joint surfaces of which are transverse in relation to the longitudinal direction of the launder.
9. Melt launder used for a discharge of slag formed during the production of metals, which launder is manufactured of copper or copper alloy and is curved in cross-section, characterized in that the melt launder, which is uniform in cross-section, is manufactured of slip cast and worked billet, which has been bent into a curve and that the edge parts above the calculatory melt surface are equipped with cooling water channels.
10. Melt launder according to claim 9, characterized in that one edge of the melt launder is higher than the other.
11. Melt launder according to claim 9 , characterized in that the cooling water channels are formed by boring.
12. Melt launder according to claim 9, characterized in that the cooling water channels are formed during slip casting.
13. Melt launder according to any of preceding claims, characterized in that the inner surface of the cooling water channels is grooved into a pattern.
14. Melt launder according to claim 9, characterized in that the melt launder billet is worked by rolling.
15. Melt launder according to claim 9, characterized in that the melt launder is equipped with support reinforcements.
16. Melt launder according to claim 9, characterized in that the melt launder is made up of several sections, the joint surfaces of which are transverse in relation to the longitudinal direction of the launder.
17. Melt launder according to claim 9 for the discharge of slag generated during production of copper.
PCT/FI2000/000144 1999-03-10 2000-02-23 A method for the manufacture of a melt launder and a launder manufactured by this method Ceased WO2000053986A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28089/00A AU2808900A (en) 1999-03-10 2000-02-23 A method for the manufacture of a melt launder and a launder manufactured by this method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990513 1999-03-10
FI990513A FI109308B (en) 1999-03-10 1999-03-10 Process for producing a melting trough and the melting trough produced by the method

Publications (1)

Publication Number Publication Date
WO2000053986A1 true WO2000053986A1 (en) 2000-09-14

Family

ID=8554135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000144 Ceased WO2000053986A1 (en) 1999-03-10 2000-02-23 A method for the manufacture of a melt launder and a launder manufactured by this method

Country Status (4)

Country Link
AU (1) AU2808900A (en)
FI (1) FI109308B (en)
PE (1) PE20010064A1 (en)
WO (1) WO2000053986A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033982A1 (en) * 2001-10-19 2003-04-24 Outokumpu Oyj Melt launder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102873317B (en) * 2012-09-25 2018-03-09 阳谷祥光铜业有限公司 A kind of cinder ladle cooling means

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101788A1 (en) * 1980-02-19 1982-01-07 VEB Bandstahlkombinat Hermann Matern, DDR 1220 Eisenhüttenstadt Spout, preferably a slag spout (launder) for blast furnaces
JPH05288478A (en) * 1992-04-08 1993-11-02 Sumitomo Metal Mining Co Ltd Water-cooled copper gutter manufacturing method
US5268925A (en) * 1991-03-01 1993-12-07 Degussa Aktiengesellschaft Method and apparatus for the semi-continuous melting and discharging of ceramic material in an induction melting furnace with singering crust crucible
JPH07305966A (en) * 1994-05-10 1995-11-21 Sumitomo Metal Mining Co Ltd Water cooling jacket gutter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101788A1 (en) * 1980-02-19 1982-01-07 VEB Bandstahlkombinat Hermann Matern, DDR 1220 Eisenhüttenstadt Spout, preferably a slag spout (launder) for blast furnaces
US5268925A (en) * 1991-03-01 1993-12-07 Degussa Aktiengesellschaft Method and apparatus for the semi-continuous melting and discharging of ceramic material in an induction melting furnace with singering crust crucible
JPH05288478A (en) * 1992-04-08 1993-11-02 Sumitomo Metal Mining Co Ltd Water-cooled copper gutter manufacturing method
JPH07305966A (en) * 1994-05-10 1995-11-21 Sumitomo Metal Mining Co Ltd Water cooling jacket gutter

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199348, Derwent World Patents Index; AN 1993-383721 *
DATABASE WPI Week 199604, Derwent World Patents Index; AN 1996-036478 *
PATENT ABSTRACTS OF JAPAN *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033982A1 (en) * 2001-10-19 2003-04-24 Outokumpu Oyj Melt launder
EA005333B1 (en) * 2001-10-19 2005-02-24 Отокумпу Оюй Melt launder
US6936216B2 (en) 2001-10-19 2005-08-30 Outokumpu Technology Oy Melt launder
CN100436997C (en) * 2001-10-19 2008-11-26 奥托库姆普联合股份公司 Melt launder

Also Published As

Publication number Publication date
FI990513A0 (en) 1999-03-10
FI109308B (en) 2002-06-28
AU2808900A (en) 2000-09-28
FI990513L (en) 2000-09-11
PE20010064A1 (en) 2001-02-21

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