WO2007063164A1 - Cooling element and method for manufacturing the same - Google Patents

Cooling element and method for manufacturing the same Download PDF

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Publication number
WO2007063164A1
WO2007063164A1 PCT/FI2006/000387 FI2006000387W WO2007063164A1 WO 2007063164 A1 WO2007063164 A1 WO 2007063164A1 FI 2006000387 W FI2006000387 W FI 2006000387W WO 2007063164 A1 WO2007063164 A1 WO 2007063164A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
copper
cooling element
cooling
pipes
Prior art date
Application number
PCT/FI2006/000387
Other languages
French (fr)
Inventor
Kai SEPPÄLÄ
Jyrki Koitto
Risto Saarinen
Original Assignee
Outotec 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 Outotec Oyj. filed Critical Outotec Oyj.
Priority to KR1020087013224A priority Critical patent/KR101277112B1/en
Priority to BRPI0619050-2A priority patent/BRPI0619050A2/en
Priority to CN2006800451442A priority patent/CN101322003B/en
Priority to AU2006319123A priority patent/AU2006319123B2/en
Priority to PL06830915T priority patent/PL1954999T3/en
Priority to DE602006009137T priority patent/DE602006009137D1/en
Priority to EP06830915A priority patent/EP1954999B1/en
Priority to AT06830915T priority patent/ATE442563T1/en
Priority to US12/093,581 priority patent/US8038930B2/en
Publication of WO2007063164A1 publication Critical patent/WO2007063164A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0072—Casting in, on, or around objects which form part of the product for making objects with integrated channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4646—Cooling arrangements
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/24—Cooling arrangements
    • 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
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
    • 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
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1518—Tapholes
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • 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
    • 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
    • F27D2009/0018—Cooling of furnaces the cooling medium passing through a pattern of tubes
    • 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
    • F27D2009/0045—Cooling of furnaces the cooling medium passing a block, e.g. metallic
    • 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
    • F27D2009/0056—Use of high thermoconductive elements
    • F27D2009/0062—Use of high thermoconductive elements made from copper or copper alloy
    • 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
    • F27D2009/0067—Cooling element inlet and outlet tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12882—Cu-base component alternative to Ag-, Au-, or Ni-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12903—Cu-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12903—Cu-base component
    • Y10T428/1291—Next to Co-, Cu-, or Ni-base component

Definitions

  • the present invention relates to a cooling element used in the structure of a pyrometallurgical reactor and to a method for manufacturing said cooling element.
  • reactor linings are protected by water-cooled cooling elements, so that owing to the cooling, the heat emitted on the lining surface is through the cooling element transferred to water, in which case the wearing of the lining is essentially reduced in comparison with a reactor that has not been cooled.
  • the reduction in wearing is achieved by the so-called autogenous lining solidified on the surface of the refractory lining, which autogenous lining is formed by slag and other molten phases.
  • the cooling element should have a good heat transfer capacity, and the elements should resist the sudden temperature changes of metallurgic furnaces and generally high temperatures.
  • cooling elements can be manufactured for example by sand casting, where in a mold made in sand, there is arranged a cooling pipework made of a material such as copper with a good heat transfer capacity, and during the casting process carried out around said pipework, the pipework is cooled either by air or by water.
  • the element cast around the pipework is made of a material with a good heat conductive capacity, preferably copper.
  • This kind of manufacturing method is described for instance in the GB patent 1386645.
  • the US patent 5,904,893 describes a cooling element used in metallurgic furnaces and the manufacturing thereof. According to said publication, a cooling element made of copper is made by casting the copper in a copper mold around the cooling pipework.
  • the major problem of said method is that the pipework serving as the flow channel is attached unevenly to the surrounding casting material, because part of the pipes can be completely detached of the surrounding cast element, and part of the pipe can be completely molten and thus damaged. If a metallic bond is not created between the cooling pipe and the rest of the element cast around it, heat transfer is not effective between the cooling element and the cooling medium. Thus also the heat resistance of the cooling element is weakened. If again the pipework melts completely, it prevents the passage of the cooling water.
  • the object of the present invention is to eliminate some of the drawbacks of the prior art and to realize a new type of cooling element to be used in the structure of a pyrometallurgical reactor meant for the manufacturing of metals, so that a good heat transfer is achieved between the cooling element and the cooling pipe.
  • the object of the invention is to realize a method for manufacturing said cooling element.
  • the invention brings forth remarkable advantages.
  • the invention relates to a cooling element to be used in the structure of a pyrometallurgical reactor meant for the manufacturing of metals, said cooling element comprising a housing element mainly made of copper, provided with a channel system compiled of pipes mainly made of copper for the cooling medium circulation, so that on the outer surface of the pipes constituting the channel system there is arranged a coating with a melting point that is lower than with the material of the housing element and the pipe.
  • copper means mainly pure copper, such as copper deoxidized with phosphorus that is most generally used in cooling elements.
  • the coating is an alloy where copper is alloyed with at least one ingredient that lowers its melting point, in which case there is advantageously achieved a bronze contact with a good heat transfer capacity between the pipe and the housing element, i.e. heat is transferred more effectively from the cooling element to the cooling medium.
  • the coating is an alloy of copper, tin and/or silver.
  • the coating is copper with a tin content of 10%.
  • the coating can also be copper with 10% silver, or an alloy of copper, lead and tin.
  • the coating is silver, which is known to have a lower melting point (961 0 C) than copper (1083 °C).
  • the thickness of the coating according to the invention is advantageously 0.1 - 1 millimeters, in which case the border surface between the pipe and the coating is protected against melting during the casting of the housing element.
  • the housing element of the cooling element is cast around pipes, in which case there is arranged circulation of the cooling medium, such as pressurized water, in the pipes during the casting of the housing of the cooling element, so that the border surface between the pipe and the coating remains solid, and that the pipe should not be damaged during the casting process owing to heat.
  • the cooling in the pipes is arranged by means of circulating water to be so effective that melting does not take place in the contact surface between the copper pipe and the coating, but that coalescence does take place in the contact surface between the coating and the molten copper, which coalescence enhances the creation of a good metallurgic contact.
  • the pipes are coated prior to the casting of the cooling element, and the pipes are designed in the desired shape either before or after the coating.
  • the coating forms an advantageous contact surface between the housing element of the cast cooling element and the outer surface of the pipes.
  • the coating includes as an alloying ingredient a metal with a good solubility into copper, this enhances the creation of the contact surface.
  • a coating that is metallurgically well attached around the pipe, in which coating the ingredient alloyed in copper for lowering its melting point enhances the creation of a durable bond.
  • the coating according to the invention there is achieved a contact surface that has good heat transfer capacities and good durability between the cooling element and the pipe, which surface surrounds the pipe along its whole outer surface.
  • the shape and size of the cooling element are dependent of the target of usage in each case.
  • the pipes are coated by melt coating, in which case they are immersed in molten coating material.
  • the coating is made by electrolytic coating.
  • the pipes are coated by thermal spraying technique, such as flame spraying, so that as the mixture of combustion gas and oxygen burns, it melts the coating material that has the shape of wire or powder.
  • the molten coating is blown as pressurized on the surface of the pipes by means of a certain type of nozzle system.
  • the cooling element is the surrounding element of the taphole meant for tapping the melt, in which case at least part of the cooling element is arranged essentially to surround the taphole.
  • Figure 1 illustrates how the temperature is distributed in a cooling element according to the invention, when the coating is copper with 10 percent tin
  • Figure 2 illustrates how the temperature is distributed in a cooling element according to the invention, when the coating is copper with 10 percent silver;
  • FIGS. 3a, 3b and 3c illustrate a cooling element according to the invention.
  • Figures 1 and 2 illustrate how the temperature T behaves in the coating A of the pipes cast inside the housing element 2 of the cooling element and in the pipe wall B.
  • the exemplary coating material is an alloy where copper is alloyed by 10% of tin
  • the thickness A of the coating is 1 millimeter
  • the thickness B of the pipe wall is 6 millimeters.
  • the circulation of the cooling medium such as water, in order to prevent the border surface K between the pipe and the coating from melting owing to the temperature of the housing element 2, but for keeping it solid.
  • the curve C and in Figure 2 the curve F describe the temperature gradient at the beginning of the casting process in the coating A, between the contact surface L between the housing element 2 to be cast and the coating, and between the contact surface K between the wall and the coating, and in the wall B of the pipe.
  • the temperature of the copper housing element 2 rises above its melting point (1083 °C).
  • the temperature drops in the coating A, when proceeding towards the contact surface K between the pipe and the coating.
  • the regions D and H describe how the copper and the alloying ingredient are coalescenced on the outer surface of the coating.
  • Coalescence takes place, because the temperature in this outermost layer of the coating is higher than the solidus temperature of the coating alloy (840 °C for a Cu-Sn alloy, and 780 0 C for a Cu-Ag alloy).
  • the regions I and J describe solid regions in the layer of the coating A that falls on the side of the wall B.
  • the curves E and G describe the temperature gradient in the coating A and in the pipe wall B in a later stage of the casting process, when the cast copper housing element 2 in the vicinity of the cooling pipes already is solidified. At this stage, both the copper housing element and the copper pipe are in solid state, and the cooling medium circulation can be closed off.
  • the pipe coating A is still partly molten, because the temperature is higher than the solidus temperature of the coating.
  • the partly molten coating is solidified as the cast object is further cooled, thus creating a close contact with good heat transfer capacities between the cast copper housing element and the cooling pipe.
  • FIGs 3a, 3b and 3c there is by way of example illustrated a cooling element 1 according to the invention.
  • Figure 3b is a cross-section in the direction X of Figure 3a
  • Figure 3c is a cross-section of Figure 3a in the direction Y.
  • the cooling element is an element surrounding the taphole 6 used in a pyrometallurgical reactor for tapping molten metal, in which case it protects the refractory ceramic linings 8 surrounding the taphole 6 from being damaged during the tapping of the high-temperature melt.
  • the housing element 2 of the cooling element is made of pure copper where the oxygen content is minimized.
  • the cooling medium is water, which is pressurized into the pipes at a pressure of about 6 bar, in order to achieve an efficient cooling effect in the coating 7 and the pipe 3 before the cast is solidified.
  • the employed pipe is any thick-walled copper pipe that is in measures suited for the purpose of usage; the inner diameter of the pipe in the example is 24 millimeters.
  • a coating 7 for realizing a durable contact with a good heat transfer capacity between the housing element 2 of the copper cooling element and the copper pipe 3.
  • the employed coating material is an alloy where copper is alloyed by at least one ingredient that drops its melting point in order to achieve a bronze contact with advantageous heat transfer capacities between the pipe and the housing element.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Thermistors And Varistors (AREA)

Abstract

The invention relates to a cooling element (1) to be used in the structure of a pyrometallurgical reactor used in the manufacturing of metals, which cooling element comprises a housing element (2) mainly made of copper, provided with a channel system for the cooling medium circulation, made of pipe (3) that is mainly made of copper; on the outer surface of the pipes (3) forming the channel system, there is arranged a coating (7, A) that has a lower melting point than the material of the housing element (2) and the pipe (3, B). The invention also relates to a method for manufacturing the cooling element.

Description

COOLING ELEMENT AND METHOD FOR MANUFACTURING THE SAME
The present invention relates to a cooling element used in the structure of a pyrometallurgical reactor and to a method for manufacturing said cooling element.
In pyrometallurgical processes, reactor linings are protected by water-cooled cooling elements, so that owing to the cooling, the heat emitted on the lining surface is through the cooling element transferred to water, in which case the wearing of the lining is essentially reduced in comparison with a reactor that has not been cooled. The reduction in wearing is achieved by the so-called autogenous lining solidified on the surface of the refractory lining, which autogenous lining is formed by slag and other molten phases. The cooling element should have a good heat transfer capacity, and the elements should resist the sudden temperature changes of metallurgic furnaces and generally high temperatures.
Conventionally cooling elements can be manufactured for example by sand casting, where in a mold made in sand, there is arranged a cooling pipework made of a material such as copper with a good heat transfer capacity, and during the casting process carried out around said pipework, the pipework is cooled either by air or by water. Also the element cast around the pipework is made of a material with a good heat conductive capacity, preferably copper. This kind of manufacturing method is described for instance in the GB patent 1386645. Also the US patent 5,904,893 describes a cooling element used in metallurgic furnaces and the manufacturing thereof. According to said publication, a cooling element made of copper is made by casting the copper in a copper mold around the cooling pipework. Because the material to be cast and the cooling pipe are made of the same material, the described method has several remarkable drawbacks. The major problem of said method is that the pipework serving as the flow channel is attached unevenly to the surrounding casting material, because part of the pipes can be completely detached of the surrounding cast element, and part of the pipe can be completely molten and thus damaged. If a metallic bond is not created between the cooling pipe and the rest of the element cast around it, heat transfer is not effective between the cooling element and the cooling medium. Thus also the heat resistance of the cooling element is weakened. If again the pipework melts completely, it prevents the passage of the cooling water.
The publication US 6,280,681 B1 describes a cooling element where various different materials, such as copper-nickel alloys, are suggested to be used in the cooling pipes. However, in that case the achieved heat transfer between the cooling element and the cooling liquid is not as good as when using copper pipes.
In addition, from the publication WO 2004057256 there is known a cooling element and method for manufacturing the same, where the cooling pipes of a cooling element made of copper or copper alloy are electrolytically coated by a thin metal layer, such as nickel.
The object of the present invention is to eliminate some of the drawbacks of the prior art and to realize a new type of cooling element to be used in the structure of a pyrometallurgical reactor meant for the manufacturing of metals, so that a good heat transfer is achieved between the cooling element and the cooling pipe. In addition, the object of the invention is to realize a method for manufacturing said cooling element. The essential novel features of the invention are apparent from the appended claims.
The invention brings forth remarkable advantages. The invention relates to a cooling element to be used in the structure of a pyrometallurgical reactor meant for the manufacturing of metals, said cooling element comprising a housing element mainly made of copper, provided with a channel system compiled of pipes mainly made of copper for the cooling medium circulation, so that on the outer surface of the pipes constituting the channel system there is arranged a coating with a melting point that is lower than with the material of the housing element and the pipe. In this connection, copper means mainly pure copper, such as copper deoxidized with phosphorus that is most generally used in cooling elements. According to an embodiment of the invention, the coating is an alloy where copper is alloyed with at least one ingredient that lowers its melting point, in which case there is advantageously achieved a bronze contact with a good heat transfer capacity between the pipe and the housing element, i.e. heat is transferred more effectively from the cooling element to the cooling medium. According to an embodiment, the coating is an alloy of copper, tin and/or silver. According to another embodiment, the coating is copper with a tin content of 10%. According to the invention, the coating can also be copper with 10% silver, or an alloy of copper, lead and tin. According to a preferred embodiment, the coating is silver, which is known to have a lower melting point (961 0C) than copper (1083 °C). The thickness of the coating according to the invention is advantageously 0.1 - 1 millimeters, in which case the border surface between the pipe and the coating is protected against melting during the casting of the housing element.
According to the invention, the housing element of the cooling element is cast around pipes, in which case there is arranged circulation of the cooling medium, such as pressurized water, in the pipes during the casting of the housing of the cooling element, so that the border surface between the pipe and the coating remains solid, and that the pipe should not be damaged during the casting process owing to heat. The cooling in the pipes is arranged by means of circulating water to be so effective that melting does not take place in the contact surface between the copper pipe and the coating, but that coalescence does take place in the contact surface between the coating and the molten copper, which coalescence enhances the creation of a good metallurgic contact. The pipes are coated prior to the casting of the cooling element, and the pipes are designed in the desired shape either before or after the coating.
When the cast housing element of the cooling element is solidified around the pipes and the coating, the cooling in the pipes is stopped, and the coating forms an advantageous contact surface between the housing element of the cast cooling element and the outer surface of the pipes. When the coating includes as an alloying ingredient a metal with a good solubility into copper, this enhances the creation of the contact surface. By means of the invention, there is realized a coating that is metallurgically well attached around the pipe, in which coating the ingredient alloyed in copper for lowering its melting point enhances the creation of a durable bond. By means of the coating according to the invention, there is achieved a contact surface that has good heat transfer capacities and good durability between the cooling element and the pipe, which surface surrounds the pipe along its whole outer surface. Generally the shape and size of the cooling element are dependent of the target of usage in each case.
According to an embodiment of the invention, the pipes are coated by melt coating, in which case they are immersed in molten coating material. According to an embodiment, the coating is made by electrolytic coating. According to an embodiment, the pipes are coated by thermal spraying technique, such as flame spraying, so that as the mixture of combustion gas and oxygen burns, it melts the coating material that has the shape of wire or powder. The molten coating is blown as pressurized on the surface of the pipes by means of a certain type of nozzle system. In an embodiment of the invention, the cooling element is the surrounding element of the taphole meant for tapping the melt, in which case at least part of the cooling element is arranged essentially to surround the taphole.
The invention is explained in more detail with reference to the appended drawings, wherein
Figure 1 illustrates how the temperature is distributed in a cooling element according to the invention, when the coating is copper with 10 percent tin; Figure 2 illustrates how the temperature is distributed in a cooling element according to the invention, when the coating is copper with 10 percent silver; and
Figures 3a, 3b and 3c illustrate a cooling element according to the invention.
Figures 1 and 2 illustrate how the temperature T behaves in the coating A of the pipes cast inside the housing element 2 of the cooling element and in the pipe wall B. In Figure 1 , the exemplary coating material is an alloy where copper is alloyed by 10% of tin, and in Figure 2 there is illustrated an alloy where copper is alloyed by 10% silver. According to the example, the thickness A of the coating is 1 millimeter, and the thickness B of the pipe wall is 6 millimeters. Inside the pipe, there is arranged the circulation of the cooling medium, such as water, in order to prevent the border surface K between the pipe and the coating from melting owing to the temperature of the housing element 2, but for keeping it solid. In Figure 1 , the curve C and in Figure 2 the curve F describe the temperature gradient at the beginning of the casting process in the coating A, between the contact surface L between the housing element 2 to be cast and the coating, and between the contact surface K between the wall and the coating, and in the wall B of the pipe. During the casting process, the temperature of the copper housing element 2 rises above its melting point (1083 °C). Owing to the cooling medium circulation, the temperature drops in the coating A, when proceeding towards the contact surface K between the pipe and the coating. The regions D and H describe how the copper and the alloying ingredient are coalescenced on the outer surface of the coating. Coalescence takes place, because the temperature in this outermost layer of the coating is higher than the solidus temperature of the coating alloy (840 °C for a Cu-Sn alloy, and 780 0C for a Cu-Ag alloy). The regions I and J describe solid regions in the layer of the coating A that falls on the side of the wall B. In Figures 1 and 2, the curves E and G describe the temperature gradient in the coating A and in the pipe wall B in a later stage of the casting process, when the cast copper housing element 2 in the vicinity of the cooling pipes already is solidified. At this stage, both the copper housing element and the copper pipe are in solid state, and the cooling medium circulation can be closed off. However, the pipe coating A is still partly molten, because the temperature is higher than the solidus temperature of the coating. The partly molten coating is solidified as the cast object is further cooled, thus creating a close contact with good heat transfer capacities between the cast copper housing element and the cooling pipe.
In Figures 3a, 3b and 3c, there is by way of example illustrated a cooling element 1 according to the invention. Figure 3b is a cross-section in the direction X of Figure 3a, and Figure 3c is a cross-section of Figure 3a in the direction Y. According to the example, the cooling element is an element surrounding the taphole 6 used in a pyrometallurgical reactor for tapping molten metal, in which case it protects the refractory ceramic linings 8 surrounding the taphole 6 from being damaged during the tapping of the high-temperature melt. The housing element 2 of the cooling element is made of pure copper where the oxygen content is minimized. Inside the cooling element 1 , there are arranged copper pipes 3 made for the cooling medium circulation, which pipes are so designed, that they surround the taphole 6 for achieving a maximal cooling effect. For the cooling medium, there are provided inlet and outlet apertures 4 and 5 for circulating the medium in and out of the pipes 3. When manufacturing the cooling element, the cooling medium according to the invention is water, which is pressurized into the pipes at a pressure of about 6 bar, in order to achieve an efficient cooling effect in the coating 7 and the pipe 3 before the cast is solidified. The employed pipe is any thick-walled copper pipe that is in measures suited for the purpose of usage; the inner diameter of the pipe in the example is 24 millimeters. On the surface of the pipes 3, there is provided a coating 7 for realizing a durable contact with a good heat transfer capacity between the housing element 2 of the copper cooling element and the copper pipe 3. The employed coating material is an alloy where copper is alloyed by at least one ingredient that drops its melting point in order to achieve a bronze contact with advantageous heat transfer capacities between the pipe and the housing element. For a man skilled in the art, it is obvious that the various embodiments of the invention are not restricted to those explained above, but may vary within the scope of the appended claims.

Claims

1. A cooling element (1) to be used in the structure of a pyrometallurgical reactor used in the manufacturing of metals, which cooling element comprises a housing element (2) mainly made of copper, provided with a channel system for the cooling medium circulation, made of pipe (3) that is mainly made of copper, characterized in that on the outer surface of the pipes (3) forming the channel system, there is arranged a coating (7, A) that has a lower melting point than the material of the housing element (2) and the pipe (3, B).
2. A cooling element according to claim 1 , characterized in that the coating (7, A) is an alloy where copper is alloyed by at least one ingredient lowering its melting point.
3. A cooling element according to claim 1 or 2, characterized in that the coating (7, A) is an alloy of copper, tin and/or silver.
4. A cooling element according to claim 1 , 2 or 3, characterized in that the coating (7, A) is copper with a 10% tin content.
5. A cooling element according to claim 1 , 2 or 3, characterized in that the coating (7, A) is copper with a 10% silver content.
6. A cooling element according to claim 1 or 2, characterized in that the coating (7, A) is an alloy on copper, lead and tin.
7. A cooling element according to claim 1 , characterized in that the coating (7, A) is silver.
8. A cooling element according to any of the claims 1 - 7, characterized in that the thickness of the coating (7, A) is 0.1 - 1 millimeters.
9. A method for manufacturing a cooling element (1) to be used in the structure of a pyrometallurgical reactor used in the manufacturing of metals, which cooling element comprises a housing element (2) mainly made of copper, provided with a channel system for the cooling medium circulation, made of pipe (3) that is mainly made of copper, in which method the housing element (2) of the cooling element is cast around the pipes (3), and the cooling medium circulates in the pipes, characterized in that the pipes are prior to the casting of the cooling element coated at their outer surface by a coating (7, A) that has a lower melting point than the material of the housing element (2) and the pipe (3, B).
10. A method according to claim 9, characterized in that the employed coating (7, A) is an alloy where copper is alloyed by at least one ingredient lowering its melting point.
11.A method according to claim 9 or 10, characterized in that the pipes are cooled by a cooling medium, such as water, for the duration of the casting of the housing element (2) of the cooling element, so that the contact surface (K) between the coating (7, A) and the pipe remains solid.
12. A method according to claim 9, 10 or 11 , characterized in that the circulation of the cooling medium in the pipes (3) is stopped as the housing element (2) is solidified.
13. A method according to claim 9, 10 or 11 , characterized in that the coating (7, A) is formed by melt coating.
14. A method according to claim 9, 10 or 11 , characterized in that the coating (7, A) is formed by electrolytic coating.
15. A method according to claim 9, 10 or 11 , characterized in that the coating (7, A) is formed by thermal spraying technique.
16. A method according to claim 9, 10, 11 , 13, 14 or 15, characterized in that the employed coating (7, A) is an alloy of copper, tin and/or silver.
17. A method according to claim 9, 10, 11 , 13, 14, 15 or 16, characterized in that the employed coating (7, A) is copper, alloyed by 10% tin.
18. A method according to claim 9, 10, 11 , 13, 14, 15 or 16, characterized in that the employed coating (J, A) is copper, alloyed by 10% silver.
19. A method according to claim 9, 10, 11 , 13, 14 or 15, characterized in that the employed coating (7, A) is an alloy of copper, lead and tin.
20. A method according to claim 9, 10, 11 , 13, 14 or 15, characterized in that the employed coating (7, A) is silver.
21. A method according to any of the preceding claims, characterized in that the cooling element (1) is a surrounding element of a taphole (6) meant for tapping the melt, in which case at least part of the cooling element is arranged to essentially surround the taphole.
PCT/FI2006/000387 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same WO2007063164A1 (en)

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KR1020087013224A KR101277112B1 (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same
BRPI0619050-2A BRPI0619050A2 (en) 2005-11-30 2006-11-23 COOLING ELEMENT AND MANUFACTURING METHOD
CN2006800451442A CN101322003B (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same
AU2006319123A AU2006319123B2 (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same
PL06830915T PL1954999T3 (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same
DE602006009137T DE602006009137D1 (en) 2005-11-30 2006-11-23 COOLING ELEMENT AND METHOD FOR THE PRODUCTION THEREOF
EP06830915A EP1954999B1 (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same
AT06830915T ATE442563T1 (en) 2005-11-30 2006-11-23 COOLING ELEMENT AND METHOD FOR PRODUCING SAME
US12/093,581 US8038930B2 (en) 2005-11-30 2006-11-23 Cooling element and method for manufacturing the same

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FI20051220A FI121429B (en) 2005-11-30 2005-11-30 Heat sink and method for making the heat sink
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CN103398589A (en) * 2013-08-15 2013-11-20 长沙有色冶金设计研究院有限公司 Punching deslagging device of metallurgical furnace
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US20080272525A1 (en) 2008-11-06
FI20051220A (en) 2007-05-31
BRPI0619050A2 (en) 2011-09-20
ZA200804323B (en) 2009-03-25
DE602006009137D1 (en) 2009-10-22
FI20051220A0 (en) 2005-11-30
AU2006319123B2 (en) 2010-07-29
KR101277112B1 (en) 2013-06-20
AU2006319123A1 (en) 2007-06-07
CN101322003A (en) 2008-12-10
FI121429B (en) 2010-11-15
US8038930B2 (en) 2011-10-18
KR20080074149A (en) 2008-08-12
EP1954999A1 (en) 2008-08-13
PL1954999T3 (en) 2010-02-26
CN101322003B (en) 2010-09-01
ATE442563T1 (en) 2009-09-15

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