EP1604146A1 - System for optically analyzing a molten bath - Google Patents

System for optically analyzing a molten bath

Info

Publication number
EP1604146A1
EP1604146A1 EP04717356A EP04717356A EP1604146A1 EP 1604146 A1 EP1604146 A1 EP 1604146A1 EP 04717356 A EP04717356 A EP 04717356A EP 04717356 A EP04717356 A EP 04717356A EP 1604146 A1 EP1604146 A1 EP 1604146A1
Authority
EP
European Patent Office
Prior art keywords
molten metal
gas stream
metal bath
lance
passing
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.)
Withdrawn
Application number
EP04717356A
Other languages
German (de)
French (fr)
Other versions
EP1604146A4 (en
Inventor
Larry E. Cates
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.)
Praxair Technology Inc
Original Assignee
Praxair Technology Inc
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 Praxair Technology Inc filed Critical Praxair Technology Inc
Publication of EP1604146A1 publication Critical patent/EP1604146A1/en
Publication of EP1604146A4 publication Critical patent/EP1604146A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C21C5/4606—Lances or injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • 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
    • C21C5/4673—Measuring and sampling devices
    • 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
    • F27D19/00—Arrangements of controlling devices
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0014—Devices for monitoring temperature
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
    • F27D2003/164—Oxygen
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value

Definitions

  • This invention relates generally to refining molten metal, e.g. steel, and, more particularly, to analyzing the molten metal bath during the refining.
  • Metals such as steel are typically produced and refined in a refractory lined vessel by heating charge materials such as metal bearing scrap, pig iron, ore, limestone, dolomite, etc. to a molten state and blowing oxygen into the resulting molten metal bath in order to oxidize impurities. It is not always possible to know the precise chemical composition of the charge materials prior to the start of processing. Therefore, the composition must be determined after the charge materials have become molten and thoroughly mixed. Moreover, the changing composition of the molten metal bath must be at least periodically determined so as to know the timing and quantity of additives made to the refining vessel contents.
  • the standard method for determining the composition of a molten metal bath is to stop the production process, withdraw a small sample of material, and analyze this sample using a mass spectrometer.
  • a method for optically analyzing a molten metal bath comprising:
  • flame envelope means a combusting stream around at least one other non-combusting gas stream.
  • coalescent gas stream means a gas stream whose diameter remains substantially constant .
  • molten metal bath means the contents of a metal refining furnace comprising molten metal and which also may comprise slag.
  • optical data means a value describing a characteristic of a molten metal bath which can be sensed by a receiver spaced from the molten metal bath.
  • the term "sight glass” means an optically transparent material, such as sapphire or quartz, capable of providing a seal between a pressurized stream of gas in a lance and the fiber optic cable or other optical components.
  • a light source such as a laser, may be fitted to the sight glass to increase the energy of the molten metal bath observed through the coherent j et so as to improve the effectiveness of the analysis.
  • molten metal furnace 10 which contains a molten metal bath comprising molten metal 4 and a slag layer 5, which may be molten or solid, above the pool of molten metal .
  • molten metal will comprise iron or steel .
  • the slag layer generally comprises one or more of calcium oxide, silicon dioxide, magnesium oxide, aluminum oxide and iron oxide .
  • Lance 1 is positioned so as to provide gas to the molten metal bath.
  • the embodiment illustrated in the Figure is a preferred embodiment wherein the lance is positioned so as to provide gas to the molten metal bath in a direction perpendicular to the surface of the molten metal bath.
  • the lance could be positioned through a sidewall of furnace 10 so as to provide gas angularly to the surface of the bath.
  • any useful gas may be used in the gas stream provided to the bath from the lance, typically and preferably the gas is oxygen, such as commercial oxygen, or a gas mixture comprising oxygen.
  • gases which may be used in the gas stream in the practice of this invention include nitrogen, argon, carbon dioxide, hydrogen, helium, steam, hydrocarbon gases, and gas mixtures comprising one or more thereof.
  • the gas is provided from the lance at a high velocity, preferably at sonic or supersonic velocity. Generally the velocity of the gas stream 3 provided from the lance has a velocity of at least 1000 feet per second
  • the gas stream has a supersonic velocity upon ejection from the lance and also has a supersonic velocity when it contacts the bath surface.
  • Fuel and oxidant are provided out from the lance around the gas stream and combust to form a flame envelope 2 around the gas stream 3.
  • the flame envelope extends for the entire length of the gas stream within the furnace from the lance ejection end to the bath.
  • the fuel used to form flame envelope 2 is preferably gaseous and may be any fuel such as methane or natural gas .
  • the oxidant used to form flame envelope 2 may be air, oxygen- enriched air having an oxygen concentration exceeding that of air, or commercial oxygen having an oxygen concentration of at least 90 mole percent.
  • Flame envelope 2 serves to keep ambient gas, e.g. furnace gases, from being drawn into or entrained into gas stream 3, thereby keeping the velocity of stream 3 from significantly decreasing and keeping the diameter of gas stream 3 from significantly increasing, generally for a distance of at least 20d where d is the diameter of the nozzle at the lance ejection end from which gas stream 3 is ejected. That is, flame envelope 2 serves to establish and maintain gas stream 3 as a coherent gas stream generally for a distance of at least 20d.
  • gas stream 3 is a coherent gas stream from the lance to the bath.
  • the gas or gas mixture passed to the bath in gas stream 3 serves to refine the molten metal by reacting with bath constituents and/or mixing the bath.
  • the high velocity and coherent nature of gas stream 3 serves to drive gas stream 3 through slag layer 5 and deep into molten metal 4 so as to enhance the refining and/or mixing action of the gas delivered to the bath in gas stream 3.
  • the gas in gas stream 3 comprises oxygen which reacts with carbon in the molten metal to decarburize the molten metal, in the process forming gas bubbles 6 of carbon dioxide and/or carbon monoxide.
  • sight glass 9 is mounted on lance 1 on the end opposite the ejection end to provide a pressure seal to prevent leakage of oxygen or other gases from the lance while providing an optically transparent view port.
  • gas stream 3 which keeps furnace gases, fumes, particles, etc. from being entrained into gas stream 3 , enables a clear line of sight to form from sight glass 9 to the molten metal bath.
  • the optical data is passed to an analyzer 7, such as by light guide assembly 8 which may comprise fiber optic cable or a system of lenses and mirrors.
  • Analyzer 7 may be, for example, an optical spectrometer optical pyrometer, or a combination of these instruments .
  • Analyzer 7 employs the data to provide measurements of temperature and composition of the molten metal bath, thereby enabling the operator to make adjustments to the amounts and timing of additional charge materials, fluxing agents, alloys, electrical energy, and reactive agents such as oxygen, to facilitate arriving at the desired endpoint of the refining process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Radiation Pyrometers (AREA)

Abstract

A system for optically analyzing a molten metal bath (4) wherein a high velocity gas stream (3) is passed from a lance (1) to the bath (4) and is maintained coherent by a flame envelope (2) to provide a clear sight pathway through the gas stream (3) for sighting the molten metal bath longitudinally through the gas stream from a remote or spaced sighting point (9).

Description

SYSTEM FOR OPTICALLY ANALYZING A MOLTEN BATH
Technical Field
[0001] This invention relates generally to refining molten metal, e.g. steel, and, more particularly, to analyzing the molten metal bath during the refining.
Background Art
[0002] Metals such as steel are typically produced and refined in a refractory lined vessel by heating charge materials such as metal bearing scrap, pig iron, ore, limestone, dolomite, etc. to a molten state and blowing oxygen into the resulting molten metal bath in order to oxidize impurities. It is not always possible to know the precise chemical composition of the charge materials prior to the start of processing. Therefore, the composition must be determined after the charge materials have become molten and thoroughly mixed. Moreover, the changing composition of the molten metal bath must be at least periodically determined so as to know the timing and quantity of additives made to the refining vessel contents. The standard method for determining the composition of a molten metal bath is to stop the production process, withdraw a small sample of material, and analyze this sample using a mass spectrometer.
[0003] Continuous on-line measurement is more desirable but the high temperature and the presence of dust, fume, and slag do not permit locating measuring devices inside the molten metal bath. Those skilled in the art have attempted to deal with these problems by using optical fibers close to the surface of the molten metal bath or using such aids as lenses, mirrors and prisms in order to pass data from the molten metal bath to an analyzer. However such arrangements are unsatisfactory because they are complicated to set up and difficult to maintain during the refining process, thus compromising the accuracy of the data gathered and compromising the integrity of the analysis based on such data.
[0004] Accordingly it is an object of this invention to provide a system for optically analyzing a molten metal bath which can be used on a continuous basis during the refining period which overcomes the problems inherent with presently available analysis systems.
Summary Of The Invention
[0005] The above and other objects, which will become apparent to those skilled in the art upon a reading of this disclosure, are attained by the present invention, one aspect of which is;
[0006] A method for optically analyzing a molten metal bath comprising:
(A) forming a coherent gas stream by passing a gas stream out from a lance and surrounding the gas stream with a flame envelope;
(B) passing the coherent gas stream to a molten metal bath;
(C) sighting longitudinally through the coherent gas stream to view the molten metal bath and obtain optical data therefrom; and
(D) passing the optical data to an analyzer. [0007] Another aspect of the invention is: [0008] Apparatus for optically analyzing a molten metal bath comprising:
(A) a molten metal furnace containing a molten metal bath;
(B) a lance having an ejection end for passing a coherent gas stream to the molten metal bath;
(C) a sight glass mounted on the lance aligned so as to view the molten metal bath longitudinally through the coherent gas stream to obtain optical data; and
(D) an analyzer and means for passing the optical data to the analyzer.
[0009] As used herein, the term "flame envelope" means a combusting stream around at least one other non-combusting gas stream.
[0010] As used herein, the term "coherent gas stream" means a gas stream whose diameter remains substantially constant .
[0011] As used herein, the term "molten metal bath" means the contents of a metal refining furnace comprising molten metal and which also may comprise slag.
[0012] As used herein, the term "optical data" means a value describing a characteristic of a molten metal bath which can be sensed by a receiver spaced from the molten metal bath.
[0013] As used herein, the term "longitudinally" means in line with the major axis.
[0014] As used herein, the term "sight glass" means an optically transparent material, such as sapphire or quartz, capable of providing a seal between a pressurized stream of gas in a lance and the fiber optic cable or other optical components. A light source, such as a laser, may be fitted to the sight glass to increase the energy of the molten metal bath observed through the coherent j et so as to improve the effectiveness of the analysis.
Brief Description Of The Drawing [0015] The sole Figure is a simplified cross sectional representation of one preferred arrangement which may be used in the practice of the invention.
Detailed Description
[0016] The invention will be described in detail with reference to the Drawing. Referring now to the Figure, there is shown molten metal furnace 10 which contains a molten metal bath comprising molten metal 4 and a slag layer 5, which may be molten or solid, above the pool of molten metal . Typically the molten metal will comprise iron or steel . The slag layer generally comprises one or more of calcium oxide, silicon dioxide, magnesium oxide, aluminum oxide and iron oxide .
[0017] Lance 1 is positioned so as to provide gas to the molten metal bath. The embodiment illustrated in the Figure is a preferred embodiment wherein the lance is positioned so as to provide gas to the molten metal bath in a direction perpendicular to the surface of the molten metal bath. Alternatively, the lance could be positioned through a sidewall of furnace 10 so as to provide gas angularly to the surface of the bath.
[0018] While any useful gas may be used in the gas stream provided to the bath from the lance, typically and preferably the gas is oxygen, such as commercial oxygen, or a gas mixture comprising oxygen. Other gases which may be used in the gas stream in the practice of this invention include nitrogen, argon, carbon dioxide, hydrogen, helium, steam, hydrocarbon gases, and gas mixtures comprising one or more thereof. The gas is provided from the lance at a high velocity, preferably at sonic or supersonic velocity. Generally the velocity of the gas stream 3 provided from the lance has a velocity of at least 1000 feet per second
(fps) and preferably at least 1500 fps . Most preferably the gas stream has a supersonic velocity upon ejection from the lance and also has a supersonic velocity when it contacts the bath surface.
[0019] Fuel and oxidant are provided out from the lance around the gas stream and combust to form a flame envelope 2 around the gas stream 3. Preferably, as shown in the Figure, the flame envelope extends for the entire length of the gas stream within the furnace from the lance ejection end to the bath. The fuel used to form flame envelope 2 is preferably gaseous and may be any fuel such as methane or natural gas . The oxidant used to form flame envelope 2 may be air, oxygen- enriched air having an oxygen concentration exceeding that of air, or commercial oxygen having an oxygen concentration of at least 90 mole percent.
[0020] Flame envelope 2 serves to keep ambient gas, e.g. furnace gases, from being drawn into or entrained into gas stream 3, thereby keeping the velocity of stream 3 from significantly decreasing and keeping the diameter of gas stream 3 from significantly increasing, generally for a distance of at least 20d where d is the diameter of the nozzle at the lance ejection end from which gas stream 3 is ejected. That is, flame envelope 2 serves to establish and maintain gas stream 3 as a coherent gas stream generally for a distance of at least 20d. Preferably, as shown in the Figure, gas stream 3 is a coherent gas stream from the lance to the bath.
[0021] The gas or gas mixture passed to the bath in gas stream 3 serves to refine the molten metal by reacting with bath constituents and/or mixing the bath. Preferably, as shown in the Figure, the high velocity and coherent nature of gas stream 3 serves to drive gas stream 3 through slag layer 5 and deep into molten metal 4 so as to enhance the refining and/or mixing action of the gas delivered to the bath in gas stream 3. In the embodiment of the invention illustrated in the Figure the gas in gas stream 3 comprises oxygen which reacts with carbon in the molten metal to decarburize the molten metal, in the process forming gas bubbles 6 of carbon dioxide and/or carbon monoxide.
[0022] As has been discussed above, it is desirable at least periodically, and preferably continuously, to monitor the condition of the molten metal to determine, for example, its composition, temperature and/or the proportion of scrap that has been melted. In the practice of this invention these parameters are monitored by sighting through sight glass 9. Preferably, as shown in the Figure, sight glass 9 is mounted on lance 1 on the end opposite the ejection end to provide a pressure seal to prevent leakage of oxygen or other gases from the lance while providing an optically transparent view port. [0023] The coherent nature of gas stream 3, which keeps furnace gases, fumes, particles, etc. from being entrained into gas stream 3 , enables a clear line of sight to form from sight glass 9 to the molten metal bath. This enables viewing the molten metal bath by sighting longitudinally through the unobstructed pathway provided by coherent gas stream 3. This viewing enables the gathering of optical data from the bath. Data that can be gathered by viewing the molten metal through the coherent jet include temperature by way of optical pyrometry, measurement of the quantities of various elements contained in the molten metal bath and slag by way of spectroscopic analysis, and conditions of the process such as the proportion of melted scrap by analysis of the temperature trends. [0024] The optical data is passed to an analyzer 7, such as by light guide assembly 8 which may comprise fiber optic cable or a system of lenses and mirrors. Analyzer 7 may be, for example, an optical spectrometer optical pyrometer, or a combination of these instruments . Analyzer 7 employs the data to provide measurements of temperature and composition of the molten metal bath, thereby enabling the operator to make adjustments to the amounts and timing of additional charge materials, fluxing agents, alloys, electrical energy, and reactive agents such as oxygen, to facilitate arriving at the desired endpoint of the refining process.
[00253 By observing the current temperature of the molten bath and the quantity of carbon, chromium, manganese or other elements remaining in the molten metal bath, the operator can determine when the processing of the metal has reached the conditions specified for the type of metal being produced. Further, if the quantity of certain trace elements such as copper are observed to be outside the quality limitations for the metal being produced, the operator will be able to make adjustments to bring the product into specification before the completion of processing. By knowing the proportion of scrap melted, the operator will know the appropriate time to add additional scrap to the furnace .
[0026] By the use of the invention one can obtain continuous and on-line measurement of molten metal bath properties without need for using optical fibers close to the surface of the molten metal bath or using such aids as lenses, mirrors and prisms. Although the invention has been described in detail with reference to a preferred embodiment, those skilled in the art will recognize that there are other embodiments of the invention within the spirit and the scope of the claims.

Claims

[0027] 1. A method for optically analyzing a molten metal bath comprising:
(A) forming a coherent gas stream (3) by passing a gas stream out from a lance (1) and surrounding the gas stream with a flame envelope (2) ;
(B) passing the coherent gas stream to a molten metal bath (4, 5) ;
(C) sighting longitudinally through the coherent gas stream to view the molten metal bath and obtain optical data therefrom; and
(D) passing the optical data to an analyzer (7) .
[0028] 2. The method of claim 1 wherein the flame envelope extends from the lance to the molten metal bath.
[0029] 3. The method of claim 1 wherein the coherent gas stream has a supersonic velocity when it contacts the molten metal bath.
[0030] 4. Apparatus for optically analyzing a molten metal bath comprising:
(A) a molten metal furnace (10) containing a molten metal bath (4, 5);
(B) a lance (1) having an ejection end for passing a coherent gas stream (3) to the molten metal bath;
(C) a sight glass (9) mounted on the lance aligned so as to view the molten metal bath longitudinally though the coherent gas stream to obtain optical data; and
(D) an analyzer (7) and means for passing the optical data to the analyzer.
[0031] 5. The apparatus of claim 4 further comprising a light source for generating light for passage through the coherent gas stream.
[0032] 6. The apparatus of claim 5 wherein the light source is a laser.
[0033] 7. The apparatus of claim 4 wherein the sight glass is positioned on the lance on the end opposite the ejection end of the lance.
[0034] 8. The apparatus of claim 4 wherein the means for passing optical data to the analyzer comprises a light guide assembly comprising optical fiber passing from the sight glass to the analyzer.
[0035] 9. The apparatus of claim 4 wherein the analyzer comprises an optical spectrometer.
[0036] 10. The apparatus of claim 4 wherein the analyzer comprises a pyrometer.
EP04717356A 2003-03-14 2004-03-04 System for optically analyzing a molten bath Withdrawn EP1604146A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/387,544 US20040178545A1 (en) 2003-03-14 2003-03-14 System for optically analyzing a molten metal bath
US387544 2003-03-14
PCT/US2004/006442 WO2004083722A1 (en) 2003-03-14 2004-03-04 System for optically analyzing a molten bath

Publications (2)

Publication Number Publication Date
EP1604146A1 true EP1604146A1 (en) 2005-12-14
EP1604146A4 EP1604146A4 (en) 2007-01-03

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EP04717356A Withdrawn EP1604146A4 (en) 2003-03-14 2004-03-04 System for optically analyzing a molten bath

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US (1) US20040178545A1 (en)
EP (1) EP1604146A4 (en)
JP (1) JP2006524336A (en)
KR (1) KR20050109564A (en)
CN (1) CN1761839A (en)
AR (1) AR043570A1 (en)
BR (1) BRPI0408279A (en)
CA (1) CA2519016A1 (en)
MX (1) MXPA05009876A (en)
TW (1) TW200424321A (en)
WO (1) WO2004083722A1 (en)

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AR043570A1 (en) 2005-08-03
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CA2519016A1 (en) 2004-09-30
WO2004083722A1 (en) 2004-09-30
BRPI0408279A (en) 2006-03-07
US20040178545A1 (en) 2004-09-16
EP1604146A4 (en) 2007-01-03
JP2006524336A (en) 2006-10-26
KR20050109564A (en) 2005-11-21
MXPA05009876A (en) 2005-12-05

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